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Merge tag '5.14-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
[mirror_ubuntu-jammy-kernel.git] / drivers / target / target_core_alua.c
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
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
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 /*
168 * Check if the Target port group and Target port descriptor list
169 * based on tg_pt_gp_members count will fit into the response payload.
170 * Otherwise, bump rd_len to let the initiator know we have exceeded
171 * the allocation length and the response is truncated.
172 */
173 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
174 cmd->data_length) {
175 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
176 continue;
177 }
178 /*
179 * PREF: Preferred target port bit, determine if this
180 * bit should be set for port group.
181 */
182 if (tg_pt_gp->tg_pt_gp_pref)
183 buf[off] = 0x80;
184 /*
185 * Set the ASYMMETRIC ACCESS State
186 */
187 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
188 /*
189 * Set supported ASYMMETRIC ACCESS State bits
190 */
191 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
192 /*
193 * TARGET PORT GROUP
194 */
195 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
196 off += 2;
197
198 off++; /* Skip over Reserved */
199 /*
200 * STATUS CODE
201 */
202 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
203 /*
204 * Vendor Specific field
205 */
206 buf[off++] = 0x00;
207 /*
208 * TARGET PORT COUNT
209 */
210 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
211 rd_len += 8;
212
213 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
214 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
215 lun_tg_pt_gp_link) {
216 /*
217 * Start Target Port descriptor format
218 *
219 * See spc4r17 section 6.2.7 Table 247
220 */
221 off += 2; /* Skip over Obsolete */
222 /*
223 * Set RELATIVE TARGET PORT IDENTIFIER
224 */
225 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
226 off += 2;
227 rd_len += 4;
228 }
229 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
230 }
231 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
232 /*
233 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
234 */
235 put_unaligned_be32(rd_len, &buf[0]);
236
237 /*
238 * Fill in the Extended header parameter data format if requested
239 */
240 if (ext_hdr != 0) {
241 buf[4] = 0x10;
242 /*
243 * Set the implicit transition time (in seconds) for the application
244 * client to use as a base for it's transition timeout value.
245 *
246 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
247 * this CDB was received upon to determine this value individually
248 * for ALUA target port group.
249 */
250 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
251 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
252 if (tg_pt_gp)
253 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
254 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
255 }
256 transport_kunmap_data_sg(cmd);
257
258 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4);
259 return 0;
260 }
261
262 /*
263 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
264 *
265 * See spc4r17 section 6.35
266 */
267 sense_reason_t
268 target_emulate_set_target_port_groups(struct se_cmd *cmd)
269 {
270 struct se_device *dev = cmd->se_dev;
271 struct se_lun *l_lun = cmd->se_lun;
272 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
273 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
274 unsigned char *buf;
275 unsigned char *ptr;
276 sense_reason_t rc = TCM_NO_SENSE;
277 u32 len = 4; /* Skip over RESERVED area in header */
278 int alua_access_state, primary = 0, valid_states;
279 u16 tg_pt_id, rtpi;
280
281 if (cmd->data_length < 4) {
282 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
283 " small\n", cmd->data_length);
284 return TCM_INVALID_PARAMETER_LIST;
285 }
286
287 buf = transport_kmap_data_sg(cmd);
288 if (!buf)
289 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
290
291 /*
292 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
293 * for the local tg_pt_gp.
294 */
295 spin_lock(&l_lun->lun_tg_pt_gp_lock);
296 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
297 if (!l_tg_pt_gp) {
298 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
299 pr_err("Unable to access l_lun->tg_pt_gp\n");
300 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
301 goto out;
302 }
303
304 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
305 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
306 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
307 " while TPGS_EXPLICIT_ALUA is disabled\n");
308 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
309 goto out;
310 }
311 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
312 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
313
314 ptr = &buf[4]; /* Skip over RESERVED area in header */
315
316 while (len < cmd->data_length) {
317 bool found = false;
318 alua_access_state = (ptr[0] & 0x0f);
319 /*
320 * Check the received ALUA access state, and determine if
321 * the state is a primary or secondary target port asymmetric
322 * access state.
323 */
324 rc = core_alua_check_transition(alua_access_state, valid_states,
325 &primary, 1);
326 if (rc) {
327 /*
328 * If the SET TARGET PORT GROUPS attempts to establish
329 * an invalid combination of target port asymmetric
330 * access states or attempts to establish an
331 * unsupported target port asymmetric access state,
332 * then the command shall be terminated with CHECK
333 * CONDITION status, with the sense key set to ILLEGAL
334 * REQUEST, and the additional sense code set to INVALID
335 * FIELD IN PARAMETER LIST.
336 */
337 goto out;
338 }
339
340 /*
341 * If the ASYMMETRIC ACCESS STATE field (see table 267)
342 * specifies a primary target port asymmetric access state,
343 * then the TARGET PORT GROUP OR TARGET PORT field specifies
344 * a primary target port group for which the primary target
345 * port asymmetric access state shall be changed. If the
346 * ASYMMETRIC ACCESS STATE field specifies a secondary target
347 * port asymmetric access state, then the TARGET PORT GROUP OR
348 * TARGET PORT field specifies the relative target port
349 * identifier (see 3.1.120) of the target port for which the
350 * secondary target port asymmetric access state shall be
351 * changed.
352 */
353 if (primary) {
354 tg_pt_id = get_unaligned_be16(ptr + 2);
355 /*
356 * Locate the matching target port group ID from
357 * the global tg_pt_gp list
358 */
359 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
360 list_for_each_entry(tg_pt_gp,
361 &dev->t10_alua.tg_pt_gps_list,
362 tg_pt_gp_list) {
363 if (!tg_pt_gp->tg_pt_gp_valid_id)
364 continue;
365
366 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
367 continue;
368
369 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
370
371 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
372
373 if (!core_alua_do_port_transition(tg_pt_gp,
374 dev, l_lun, nacl,
375 alua_access_state, 1))
376 found = true;
377
378 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
379 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
380 break;
381 }
382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
383 } else {
384 struct se_lun *lun;
385
386 /*
387 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
388 * the Target Port in question for the the incoming
389 * SET_TARGET_PORT_GROUPS op.
390 */
391 rtpi = get_unaligned_be16(ptr + 2);
392 /*
393 * Locate the matching relative target port identifier
394 * for the struct se_device storage object.
395 */
396 spin_lock(&dev->se_port_lock);
397 list_for_each_entry(lun, &dev->dev_sep_list,
398 lun_dev_link) {
399 if (lun->lun_rtpi != rtpi)
400 continue;
401
402 // XXX: racy unlock
403 spin_unlock(&dev->se_port_lock);
404
405 if (!core_alua_set_tg_pt_secondary_state(
406 lun, 1, 1))
407 found = true;
408
409 spin_lock(&dev->se_port_lock);
410 break;
411 }
412 spin_unlock(&dev->se_port_lock);
413 }
414
415 if (!found) {
416 rc = TCM_INVALID_PARAMETER_LIST;
417 goto out;
418 }
419
420 ptr += 4;
421 len += 4;
422 }
423
424 out:
425 transport_kunmap_data_sg(cmd);
426 if (!rc)
427 target_complete_cmd(cmd, SAM_STAT_GOOD);
428 return rc;
429 }
430
431 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
432 {
433 /*
434 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
435 * The ALUA additional sense code qualifier (ASCQ) is determined
436 * by the ALUA primary or secondary access state..
437 */
438 pr_debug("[%s]: ALUA TG Port not available, "
439 "SenseKey: NOT_READY, ASC/ASCQ: "
440 "0x04/0x%02x\n",
441 cmd->se_tfo->fabric_name, alua_ascq);
442
443 cmd->scsi_asc = 0x04;
444 cmd->scsi_ascq = alua_ascq;
445 }
446
447 static inline void core_alua_state_nonoptimized(
448 struct se_cmd *cmd,
449 unsigned char *cdb,
450 int nonop_delay_msecs)
451 {
452 /*
453 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
454 * later to determine if processing of this cmd needs to be
455 * temporarily delayed for the Active/NonOptimized primary access state.
456 */
457 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
458 cmd->alua_nonop_delay = nonop_delay_msecs;
459 }
460
461 static inline int core_alua_state_lba_dependent(
462 struct se_cmd *cmd,
463 struct t10_alua_tg_pt_gp *tg_pt_gp)
464 {
465 struct se_device *dev = cmd->se_dev;
466 u64 segment_size, segment_mult, sectors, lba;
467
468 /* Only need to check for cdb actually containing LBAs */
469 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
470 return 0;
471
472 spin_lock(&dev->t10_alua.lba_map_lock);
473 segment_size = dev->t10_alua.lba_map_segment_size;
474 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
475 sectors = cmd->data_length / dev->dev_attrib.block_size;
476
477 lba = cmd->t_task_lba;
478 while (lba < cmd->t_task_lba + sectors) {
479 struct t10_alua_lba_map *cur_map = NULL, *map;
480 struct t10_alua_lba_map_member *map_mem;
481
482 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
483 lba_map_list) {
484 u64 start_lba, last_lba;
485 u64 first_lba = map->lba_map_first_lba;
486
487 if (segment_mult) {
488 u64 tmp = lba;
489 start_lba = do_div(tmp, segment_size * segment_mult);
490
491 last_lba = first_lba + segment_size - 1;
492 if (start_lba >= first_lba &&
493 start_lba <= last_lba) {
494 lba += segment_size;
495 cur_map = map;
496 break;
497 }
498 } else {
499 last_lba = map->lba_map_last_lba;
500 if (lba >= first_lba && lba <= last_lba) {
501 lba = last_lba + 1;
502 cur_map = map;
503 break;
504 }
505 }
506 }
507 if (!cur_map) {
508 spin_unlock(&dev->t10_alua.lba_map_lock);
509 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
510 return 1;
511 }
512 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
513 lba_map_mem_list) {
514 if (map_mem->lba_map_mem_alua_pg_id !=
515 tg_pt_gp->tg_pt_gp_id)
516 continue;
517 switch(map_mem->lba_map_mem_alua_state) {
518 case ALUA_ACCESS_STATE_STANDBY:
519 spin_unlock(&dev->t10_alua.lba_map_lock);
520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
521 return 1;
522 case ALUA_ACCESS_STATE_UNAVAILABLE:
523 spin_unlock(&dev->t10_alua.lba_map_lock);
524 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
525 return 1;
526 default:
527 break;
528 }
529 }
530 }
531 spin_unlock(&dev->t10_alua.lba_map_lock);
532 return 0;
533 }
534
535 static inline int core_alua_state_standby(
536 struct se_cmd *cmd,
537 unsigned char *cdb)
538 {
539 /*
540 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
541 * spc4r17 section 5.9.2.4.4
542 */
543 switch (cdb[0]) {
544 case INQUIRY:
545 case LOG_SELECT:
546 case LOG_SENSE:
547 case MODE_SELECT:
548 case MODE_SENSE:
549 case REPORT_LUNS:
550 case RECEIVE_DIAGNOSTIC:
551 case SEND_DIAGNOSTIC:
552 case READ_CAPACITY:
553 return 0;
554 case SERVICE_ACTION_IN_16:
555 switch (cdb[1] & 0x1f) {
556 case SAI_READ_CAPACITY_16:
557 return 0;
558 default:
559 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
560 return 1;
561 }
562 case MAINTENANCE_IN:
563 switch (cdb[1] & 0x1f) {
564 case MI_REPORT_TARGET_PGS:
565 return 0;
566 default:
567 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
568 return 1;
569 }
570 case MAINTENANCE_OUT:
571 switch (cdb[1]) {
572 case MO_SET_TARGET_PGS:
573 return 0;
574 default:
575 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
576 return 1;
577 }
578 case REQUEST_SENSE:
579 case PERSISTENT_RESERVE_IN:
580 case PERSISTENT_RESERVE_OUT:
581 case READ_BUFFER:
582 case WRITE_BUFFER:
583 return 0;
584 default:
585 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
586 return 1;
587 }
588
589 return 0;
590 }
591
592 static inline int core_alua_state_unavailable(
593 struct se_cmd *cmd,
594 unsigned char *cdb)
595 {
596 /*
597 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
598 * spc4r17 section 5.9.2.4.5
599 */
600 switch (cdb[0]) {
601 case INQUIRY:
602 case REPORT_LUNS:
603 return 0;
604 case MAINTENANCE_IN:
605 switch (cdb[1] & 0x1f) {
606 case MI_REPORT_TARGET_PGS:
607 return 0;
608 default:
609 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
610 return 1;
611 }
612 case MAINTENANCE_OUT:
613 switch (cdb[1]) {
614 case MO_SET_TARGET_PGS:
615 return 0;
616 default:
617 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
618 return 1;
619 }
620 case REQUEST_SENSE:
621 case READ_BUFFER:
622 case WRITE_BUFFER:
623 return 0;
624 default:
625 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
626 return 1;
627 }
628
629 return 0;
630 }
631
632 static inline int core_alua_state_transition(
633 struct se_cmd *cmd,
634 unsigned char *cdb)
635 {
636 /*
637 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
638 * spc4r17 section 5.9.2.5
639 */
640 switch (cdb[0]) {
641 case INQUIRY:
642 case REPORT_LUNS:
643 return 0;
644 case MAINTENANCE_IN:
645 switch (cdb[1] & 0x1f) {
646 case MI_REPORT_TARGET_PGS:
647 return 0;
648 default:
649 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
650 return 1;
651 }
652 case REQUEST_SENSE:
653 case READ_BUFFER:
654 case WRITE_BUFFER:
655 return 0;
656 default:
657 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
658 return 1;
659 }
660
661 return 0;
662 }
663
664 /*
665 * return 1: Is used to signal LUN not accessible, and check condition/not ready
666 * return 0: Used to signal success
667 * return -1: Used to signal failure, and invalid cdb field
668 */
669 sense_reason_t
670 target_alua_state_check(struct se_cmd *cmd)
671 {
672 struct se_device *dev = cmd->se_dev;
673 unsigned char *cdb = cmd->t_task_cdb;
674 struct se_lun *lun = cmd->se_lun;
675 struct t10_alua_tg_pt_gp *tg_pt_gp;
676 int out_alua_state, nonop_delay_msecs;
677
678 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
679 return 0;
680 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
681 return 0;
682
683 /*
684 * First, check for a struct se_port specific secondary ALUA target port
685 * access state: OFFLINE
686 */
687 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
688 pr_debug("ALUA: Got secondary offline status for local"
689 " target port\n");
690 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
691 return TCM_CHECK_CONDITION_NOT_READY;
692 }
693
694 if (!lun->lun_tg_pt_gp)
695 return 0;
696
697 spin_lock(&lun->lun_tg_pt_gp_lock);
698 tg_pt_gp = lun->lun_tg_pt_gp;
699 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
700 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
701
702 // XXX: keeps using tg_pt_gp witout reference after unlock
703 spin_unlock(&lun->lun_tg_pt_gp_lock);
704 /*
705 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
706 * statement so the compiler knows explicitly to check this case first.
707 * For the Optimized ALUA access state case, we want to process the
708 * incoming fabric cmd ASAP..
709 */
710 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
711 return 0;
712
713 switch (out_alua_state) {
714 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
715 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
716 break;
717 case ALUA_ACCESS_STATE_STANDBY:
718 if (core_alua_state_standby(cmd, cdb))
719 return TCM_CHECK_CONDITION_NOT_READY;
720 break;
721 case ALUA_ACCESS_STATE_UNAVAILABLE:
722 if (core_alua_state_unavailable(cmd, cdb))
723 return TCM_CHECK_CONDITION_NOT_READY;
724 break;
725 case ALUA_ACCESS_STATE_TRANSITION:
726 if (core_alua_state_transition(cmd, cdb))
727 return TCM_CHECK_CONDITION_NOT_READY;
728 break;
729 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
730 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
731 return TCM_CHECK_CONDITION_NOT_READY;
732 break;
733 /*
734 * OFFLINE is a secondary ALUA target port group access state, that is
735 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
736 */
737 case ALUA_ACCESS_STATE_OFFLINE:
738 default:
739 pr_err("Unknown ALUA access state: 0x%02x\n",
740 out_alua_state);
741 return TCM_INVALID_CDB_FIELD;
742 }
743
744 return 0;
745 }
746
747 /*
748 * Check implicit and explicit ALUA state change request.
749 */
750 static sense_reason_t
751 core_alua_check_transition(int state, int valid, int *primary, int explicit)
752 {
753 /*
754 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
755 * defined as primary target port asymmetric access states.
756 */
757 switch (state) {
758 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
759 if (!(valid & ALUA_AO_SUP))
760 goto not_supported;
761 *primary = 1;
762 break;
763 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
764 if (!(valid & ALUA_AN_SUP))
765 goto not_supported;
766 *primary = 1;
767 break;
768 case ALUA_ACCESS_STATE_STANDBY:
769 if (!(valid & ALUA_S_SUP))
770 goto not_supported;
771 *primary = 1;
772 break;
773 case ALUA_ACCESS_STATE_UNAVAILABLE:
774 if (!(valid & ALUA_U_SUP))
775 goto not_supported;
776 *primary = 1;
777 break;
778 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
779 if (!(valid & ALUA_LBD_SUP))
780 goto not_supported;
781 *primary = 1;
782 break;
783 case ALUA_ACCESS_STATE_OFFLINE:
784 /*
785 * OFFLINE state is defined as a secondary target port
786 * asymmetric access state.
787 */
788 if (!(valid & ALUA_O_SUP))
789 goto not_supported;
790 *primary = 0;
791 break;
792 case ALUA_ACCESS_STATE_TRANSITION:
793 if (!(valid & ALUA_T_SUP) || explicit)
794 /*
795 * Transitioning is set internally and by tcmu daemon,
796 * and cannot be selected through a STPG.
797 */
798 goto not_supported;
799 *primary = 0;
800 break;
801 default:
802 pr_err("Unknown ALUA access state: 0x%02x\n", state);
803 return TCM_INVALID_PARAMETER_LIST;
804 }
805
806 return 0;
807
808 not_supported:
809 pr_err("ALUA access state %s not supported",
810 core_alua_dump_state(state));
811 return TCM_INVALID_PARAMETER_LIST;
812 }
813
814 static char *core_alua_dump_state(int state)
815 {
816 switch (state) {
817 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
818 return "Active/Optimized";
819 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
820 return "Active/NonOptimized";
821 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
822 return "LBA Dependent";
823 case ALUA_ACCESS_STATE_STANDBY:
824 return "Standby";
825 case ALUA_ACCESS_STATE_UNAVAILABLE:
826 return "Unavailable";
827 case ALUA_ACCESS_STATE_OFFLINE:
828 return "Offline";
829 case ALUA_ACCESS_STATE_TRANSITION:
830 return "Transitioning";
831 default:
832 return "Unknown";
833 }
834
835 return NULL;
836 }
837
838 char *core_alua_dump_status(int status)
839 {
840 switch (status) {
841 case ALUA_STATUS_NONE:
842 return "None";
843 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
844 return "Altered by Explicit STPG";
845 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
846 return "Altered by Implicit ALUA";
847 default:
848 return "Unknown";
849 }
850
851 return NULL;
852 }
853
854 /*
855 * Used by fabric modules to determine when we need to delay processing
856 * for the Active/NonOptimized paths..
857 */
858 int core_alua_check_nonop_delay(
859 struct se_cmd *cmd)
860 {
861 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
862 return 0;
863 /*
864 * The ALUA Active/NonOptimized access state delay can be disabled
865 * in via configfs with a value of zero
866 */
867 if (!cmd->alua_nonop_delay)
868 return 0;
869 /*
870 * struct se_cmd->alua_nonop_delay gets set by a target port group
871 * defined interval in core_alua_state_nonoptimized()
872 */
873 msleep_interruptible(cmd->alua_nonop_delay);
874 return 0;
875 }
876 EXPORT_SYMBOL(core_alua_check_nonop_delay);
877
878 static int core_alua_write_tpg_metadata(
879 const char *path,
880 unsigned char *md_buf,
881 u32 md_buf_len)
882 {
883 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
884 loff_t pos = 0;
885 int ret;
886
887 if (IS_ERR(file)) {
888 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
889 return -ENODEV;
890 }
891 ret = kernel_write(file, md_buf, md_buf_len, &pos);
892 if (ret < 0)
893 pr_err("Error writing ALUA metadata file: %s\n", path);
894 fput(file);
895 return (ret < 0) ? -EIO : 0;
896 }
897
898 static int core_alua_update_tpg_primary_metadata(
899 struct t10_alua_tg_pt_gp *tg_pt_gp)
900 {
901 unsigned char *md_buf;
902 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
903 char *path;
904 int len, rc;
905
906 lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
907
908 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
909 if (!md_buf) {
910 pr_err("Unable to allocate buf for ALUA metadata\n");
911 return -ENOMEM;
912 }
913
914 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
915 "tg_pt_gp_id=%hu\n"
916 "alua_access_state=0x%02x\n"
917 "alua_access_status=0x%02x\n",
918 tg_pt_gp->tg_pt_gp_id,
919 tg_pt_gp->tg_pt_gp_alua_access_state,
920 tg_pt_gp->tg_pt_gp_alua_access_status);
921
922 rc = -ENOMEM;
923 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
924 &wwn->unit_serial[0],
925 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
926 if (path) {
927 rc = core_alua_write_tpg_metadata(path, md_buf, len);
928 kfree(path);
929 }
930 kfree(md_buf);
931 return rc;
932 }
933
934 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
935 {
936 struct se_dev_entry *se_deve;
937 struct se_lun *lun;
938 struct se_lun_acl *lacl;
939
940 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
941 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
942 lun_tg_pt_gp_link) {
943 /*
944 * After an implicit target port asymmetric access state
945 * change, a device server shall establish a unit attention
946 * condition for the initiator port associated with every I_T
947 * nexus with the additional sense code set to ASYMMETRIC
948 * ACCESS STATE CHANGED.
949 *
950 * After an explicit target port asymmetric access state
951 * change, a device server shall establish a unit attention
952 * condition with the additional sense code set to ASYMMETRIC
953 * ACCESS STATE CHANGED for the initiator port associated with
954 * every I_T nexus other than the I_T nexus on which the SET
955 * TARGET PORT GROUPS command
956 */
957 if (!percpu_ref_tryget_live(&lun->lun_ref))
958 continue;
959 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
960
961 spin_lock(&lun->lun_deve_lock);
962 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
963 lacl = rcu_dereference_check(se_deve->se_lun_acl,
964 lockdep_is_held(&lun->lun_deve_lock));
965
966 /*
967 * spc4r37 p.242:
968 * After an explicit target port asymmetric access
969 * state change, a device server shall establish a
970 * unit attention condition with the additional sense
971 * code set to ASYMMETRIC ACCESS STATE CHANGED for
972 * the initiator port associated with every I_T nexus
973 * other than the I_T nexus on which the SET TARGET
974 * PORT GROUPS command was received.
975 */
976 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
977 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
978 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
979 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
980 continue;
981
982 /*
983 * se_deve->se_lun_acl pointer may be NULL for a
984 * entry created without explicit Node+MappedLUN ACLs
985 */
986 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
987 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
988 continue;
989
990 core_scsi3_ua_allocate(se_deve, 0x2A,
991 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
992 }
993 spin_unlock(&lun->lun_deve_lock);
994
995 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
996 percpu_ref_put(&lun->lun_ref);
997 }
998 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
999 }
1000
1001 static int core_alua_do_transition_tg_pt(
1002 struct t10_alua_tg_pt_gp *tg_pt_gp,
1003 int new_state,
1004 int explicit)
1005 {
1006 int prev_state;
1007
1008 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1009 /* Nothing to be done here */
1010 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
1011 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1012 return 0;
1013 }
1014
1015 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
1016 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1017 return -EAGAIN;
1018 }
1019
1020 /*
1021 * Save the old primary ALUA access state, and set the current state
1022 * to ALUA_ACCESS_STATE_TRANSITION.
1023 */
1024 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1025 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1026 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1027 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1028 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1029
1030 core_alua_queue_state_change_ua(tg_pt_gp);
1031
1032 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1033 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1034 return 0;
1035 }
1036
1037 /*
1038 * Check for the optional ALUA primary state transition delay
1039 */
1040 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1041 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1042
1043 /*
1044 * Set the current primary ALUA access state to the requested new state
1045 */
1046 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1047
1048 /*
1049 * Update the ALUA metadata buf that has been allocated in
1050 * core_alua_do_port_transition(), this metadata will be written
1051 * to struct file.
1052 *
1053 * Note that there is the case where we do not want to update the
1054 * metadata when the saved metadata is being parsed in userspace
1055 * when setting the existing port access state and access status.
1056 *
1057 * Also note that the failure to write out the ALUA metadata to
1058 * struct file does NOT affect the actual ALUA transition.
1059 */
1060 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1061 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1062 }
1063
1064 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1065 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1066 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1067 tg_pt_gp->tg_pt_gp_id,
1068 core_alua_dump_state(prev_state),
1069 core_alua_dump_state(new_state));
1070
1071 core_alua_queue_state_change_ua(tg_pt_gp);
1072
1073 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1074 return 0;
1075 }
1076
1077 int core_alua_do_port_transition(
1078 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1079 struct se_device *l_dev,
1080 struct se_lun *l_lun,
1081 struct se_node_acl *l_nacl,
1082 int new_state,
1083 int explicit)
1084 {
1085 struct se_device *dev;
1086 struct t10_alua_lu_gp *lu_gp;
1087 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1088 struct t10_alua_tg_pt_gp *tg_pt_gp;
1089 int primary, valid_states, rc = 0;
1090
1091 if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1092 return -ENODEV;
1093
1094 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1095 if (core_alua_check_transition(new_state, valid_states, &primary,
1096 explicit) != 0)
1097 return -EINVAL;
1098
1099 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1100 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1101 lu_gp = local_lu_gp_mem->lu_gp;
1102 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1103 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1104 /*
1105 * For storage objects that are members of the 'default_lu_gp',
1106 * we only do transition on the passed *l_tp_pt_gp, and not
1107 * on all of the matching target port groups IDs in default_lu_gp.
1108 */
1109 if (!lu_gp->lu_gp_id) {
1110 /*
1111 * core_alua_do_transition_tg_pt() will always return
1112 * success.
1113 */
1114 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1115 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1116 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1117 new_state, explicit);
1118 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1119 return rc;
1120 }
1121 /*
1122 * For all other LU groups aside from 'default_lu_gp', walk all of
1123 * the associated storage objects looking for a matching target port
1124 * group ID from the local target port group.
1125 */
1126 spin_lock(&lu_gp->lu_gp_lock);
1127 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1128 lu_gp_mem_list) {
1129
1130 dev = lu_gp_mem->lu_gp_mem_dev;
1131 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1132 spin_unlock(&lu_gp->lu_gp_lock);
1133
1134 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1135 list_for_each_entry(tg_pt_gp,
1136 &dev->t10_alua.tg_pt_gps_list,
1137 tg_pt_gp_list) {
1138
1139 if (!tg_pt_gp->tg_pt_gp_valid_id)
1140 continue;
1141 /*
1142 * If the target behavior port asymmetric access state
1143 * is changed for any target port group accessible via
1144 * a logical unit within a LU group, the target port
1145 * behavior group asymmetric access states for the same
1146 * target port group accessible via other logical units
1147 * in that LU group will also change.
1148 */
1149 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1150 continue;
1151
1152 if (l_tg_pt_gp == tg_pt_gp) {
1153 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1154 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1155 } else {
1156 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1157 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1158 }
1159 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1160 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1161 /*
1162 * core_alua_do_transition_tg_pt() will always return
1163 * success.
1164 */
1165 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1166 new_state, explicit);
1167
1168 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1169 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1170 if (rc)
1171 break;
1172 }
1173 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1174
1175 spin_lock(&lu_gp->lu_gp_lock);
1176 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1177 }
1178 spin_unlock(&lu_gp->lu_gp_lock);
1179
1180 if (!rc) {
1181 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1182 " Group IDs: %hu %s transition to primary state: %s\n",
1183 config_item_name(&lu_gp->lu_gp_group.cg_item),
1184 l_tg_pt_gp->tg_pt_gp_id,
1185 (explicit) ? "explicit" : "implicit",
1186 core_alua_dump_state(new_state));
1187 }
1188
1189 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1190 return rc;
1191 }
1192
1193 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1194 {
1195 struct se_portal_group *se_tpg = lun->lun_tpg;
1196 unsigned char *md_buf;
1197 char *path;
1198 int len, rc;
1199
1200 mutex_lock(&lun->lun_tg_pt_md_mutex);
1201
1202 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1203 if (!md_buf) {
1204 pr_err("Unable to allocate buf for ALUA metadata\n");
1205 rc = -ENOMEM;
1206 goto out_unlock;
1207 }
1208
1209 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1210 "alua_tg_pt_status=0x%02x\n",
1211 atomic_read(&lun->lun_tg_pt_secondary_offline),
1212 lun->lun_tg_pt_secondary_stat);
1213
1214 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
1215 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
1216 db_root, se_tpg->se_tpg_tfo->fabric_name,
1217 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1218 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
1219 lun->unpacked_lun);
1220 } else {
1221 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
1222 db_root, se_tpg->se_tpg_tfo->fabric_name,
1223 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1224 lun->unpacked_lun);
1225 }
1226 if (!path) {
1227 rc = -ENOMEM;
1228 goto out_free;
1229 }
1230
1231 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1232 kfree(path);
1233 out_free:
1234 kfree(md_buf);
1235 out_unlock:
1236 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1237 return rc;
1238 }
1239
1240 static int core_alua_set_tg_pt_secondary_state(
1241 struct se_lun *lun,
1242 int explicit,
1243 int offline)
1244 {
1245 struct t10_alua_tg_pt_gp *tg_pt_gp;
1246 int trans_delay_msecs;
1247
1248 spin_lock(&lun->lun_tg_pt_gp_lock);
1249 tg_pt_gp = lun->lun_tg_pt_gp;
1250 if (!tg_pt_gp) {
1251 spin_unlock(&lun->lun_tg_pt_gp_lock);
1252 pr_err("Unable to complete secondary state"
1253 " transition\n");
1254 return -EINVAL;
1255 }
1256 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1257 /*
1258 * Set the secondary ALUA target port access state to OFFLINE
1259 * or release the previously secondary state for struct se_lun
1260 */
1261 if (offline)
1262 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1263 else
1264 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1265
1266 lun->lun_tg_pt_secondary_stat = (explicit) ?
1267 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1268 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1269
1270 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1271 " to secondary access state: %s\n", (explicit) ? "explicit" :
1272 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1273 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1274
1275 spin_unlock(&lun->lun_tg_pt_gp_lock);
1276 /*
1277 * Do the optional transition delay after we set the secondary
1278 * ALUA access state.
1279 */
1280 if (trans_delay_msecs != 0)
1281 msleep_interruptible(trans_delay_msecs);
1282 /*
1283 * See if we need to update the ALUA fabric port metadata for
1284 * secondary state and status
1285 */
1286 if (lun->lun_tg_pt_secondary_write_md)
1287 core_alua_update_tpg_secondary_metadata(lun);
1288
1289 return 0;
1290 }
1291
1292 struct t10_alua_lba_map *
1293 core_alua_allocate_lba_map(struct list_head *list,
1294 u64 first_lba, u64 last_lba)
1295 {
1296 struct t10_alua_lba_map *lba_map;
1297
1298 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1299 if (!lba_map) {
1300 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1301 return ERR_PTR(-ENOMEM);
1302 }
1303 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1304 lba_map->lba_map_first_lba = first_lba;
1305 lba_map->lba_map_last_lba = last_lba;
1306
1307 list_add_tail(&lba_map->lba_map_list, list);
1308 return lba_map;
1309 }
1310
1311 int
1312 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1313 int pg_id, int state)
1314 {
1315 struct t10_alua_lba_map_member *lba_map_mem;
1316
1317 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1318 lba_map_mem_list) {
1319 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1320 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1321 return -EINVAL;
1322 }
1323 }
1324
1325 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1326 if (!lba_map_mem) {
1327 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1328 return -ENOMEM;
1329 }
1330 lba_map_mem->lba_map_mem_alua_state = state;
1331 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1332
1333 list_add_tail(&lba_map_mem->lba_map_mem_list,
1334 &lba_map->lba_map_mem_list);
1335 return 0;
1336 }
1337
1338 void
1339 core_alua_free_lba_map(struct list_head *lba_list)
1340 {
1341 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1342 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1343
1344 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1345 lba_map_list) {
1346 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1347 &lba_map->lba_map_mem_list,
1348 lba_map_mem_list) {
1349 list_del(&lba_map_mem->lba_map_mem_list);
1350 kmem_cache_free(t10_alua_lba_map_mem_cache,
1351 lba_map_mem);
1352 }
1353 list_del(&lba_map->lba_map_list);
1354 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1355 }
1356 }
1357
1358 void
1359 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1360 int segment_size, int segment_mult)
1361 {
1362 struct list_head old_lba_map_list;
1363 struct t10_alua_tg_pt_gp *tg_pt_gp;
1364 int activate = 0, supported;
1365
1366 INIT_LIST_HEAD(&old_lba_map_list);
1367 spin_lock(&dev->t10_alua.lba_map_lock);
1368 dev->t10_alua.lba_map_segment_size = segment_size;
1369 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1370 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1371 if (lba_map_list) {
1372 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1373 activate = 1;
1374 }
1375 spin_unlock(&dev->t10_alua.lba_map_lock);
1376 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1377 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1378 tg_pt_gp_list) {
1379
1380 if (!tg_pt_gp->tg_pt_gp_valid_id)
1381 continue;
1382 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1383 if (activate)
1384 supported |= ALUA_LBD_SUP;
1385 else
1386 supported &= ~ALUA_LBD_SUP;
1387 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1388 }
1389 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1390 core_alua_free_lba_map(&old_lba_map_list);
1391 }
1392
1393 struct t10_alua_lu_gp *
1394 core_alua_allocate_lu_gp(const char *name, int def_group)
1395 {
1396 struct t10_alua_lu_gp *lu_gp;
1397
1398 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1399 if (!lu_gp) {
1400 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1401 return ERR_PTR(-ENOMEM);
1402 }
1403 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1404 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1405 spin_lock_init(&lu_gp->lu_gp_lock);
1406 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1407
1408 if (def_group) {
1409 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1410 lu_gp->lu_gp_valid_id = 1;
1411 alua_lu_gps_count++;
1412 }
1413
1414 return lu_gp;
1415 }
1416
1417 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1418 {
1419 struct t10_alua_lu_gp *lu_gp_tmp;
1420 u16 lu_gp_id_tmp;
1421 /*
1422 * The lu_gp->lu_gp_id may only be set once..
1423 */
1424 if (lu_gp->lu_gp_valid_id) {
1425 pr_warn("ALUA LU Group already has a valid ID,"
1426 " ignoring request\n");
1427 return -EINVAL;
1428 }
1429
1430 spin_lock(&lu_gps_lock);
1431 if (alua_lu_gps_count == 0x0000ffff) {
1432 pr_err("Maximum ALUA alua_lu_gps_count:"
1433 " 0x0000ffff reached\n");
1434 spin_unlock(&lu_gps_lock);
1435 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1436 return -ENOSPC;
1437 }
1438 again:
1439 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1440 alua_lu_gps_counter++;
1441
1442 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1443 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1444 if (!lu_gp_id)
1445 goto again;
1446
1447 pr_warn("ALUA Logical Unit Group ID: %hu"
1448 " already exists, ignoring request\n",
1449 lu_gp_id);
1450 spin_unlock(&lu_gps_lock);
1451 return -EINVAL;
1452 }
1453 }
1454
1455 lu_gp->lu_gp_id = lu_gp_id_tmp;
1456 lu_gp->lu_gp_valid_id = 1;
1457 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1458 alua_lu_gps_count++;
1459 spin_unlock(&lu_gps_lock);
1460
1461 return 0;
1462 }
1463
1464 static struct t10_alua_lu_gp_member *
1465 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1466 {
1467 struct t10_alua_lu_gp_member *lu_gp_mem;
1468
1469 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1470 if (!lu_gp_mem) {
1471 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1472 return ERR_PTR(-ENOMEM);
1473 }
1474 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1475 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1476 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1477
1478 lu_gp_mem->lu_gp_mem_dev = dev;
1479 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1480
1481 return lu_gp_mem;
1482 }
1483
1484 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1485 {
1486 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1487 /*
1488 * Once we have reached this point, config_item_put() has
1489 * already been called from target_core_alua_drop_lu_gp().
1490 *
1491 * Here, we remove the *lu_gp from the global list so that
1492 * no associations can be made while we are releasing
1493 * struct t10_alua_lu_gp.
1494 */
1495 spin_lock(&lu_gps_lock);
1496 list_del(&lu_gp->lu_gp_node);
1497 alua_lu_gps_count--;
1498 spin_unlock(&lu_gps_lock);
1499 /*
1500 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1501 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1502 * released with core_alua_put_lu_gp_from_name()
1503 */
1504 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1505 cpu_relax();
1506 /*
1507 * Release reference to struct t10_alua_lu_gp * from all associated
1508 * struct se_device.
1509 */
1510 spin_lock(&lu_gp->lu_gp_lock);
1511 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1512 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1513 if (lu_gp_mem->lu_gp_assoc) {
1514 list_del(&lu_gp_mem->lu_gp_mem_list);
1515 lu_gp->lu_gp_members--;
1516 lu_gp_mem->lu_gp_assoc = 0;
1517 }
1518 spin_unlock(&lu_gp->lu_gp_lock);
1519 /*
1520 *
1521 * lu_gp_mem is associated with a single
1522 * struct se_device->dev_alua_lu_gp_mem, and is released when
1523 * struct se_device is released via core_alua_free_lu_gp_mem().
1524 *
1525 * If the passed lu_gp does NOT match the default_lu_gp, assume
1526 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1527 */
1528 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1529 if (lu_gp != default_lu_gp)
1530 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1531 default_lu_gp);
1532 else
1533 lu_gp_mem->lu_gp = NULL;
1534 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1535
1536 spin_lock(&lu_gp->lu_gp_lock);
1537 }
1538 spin_unlock(&lu_gp->lu_gp_lock);
1539
1540 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1541 }
1542
1543 void core_alua_free_lu_gp_mem(struct se_device *dev)
1544 {
1545 struct t10_alua_lu_gp *lu_gp;
1546 struct t10_alua_lu_gp_member *lu_gp_mem;
1547
1548 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1549 if (!lu_gp_mem)
1550 return;
1551
1552 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1553 cpu_relax();
1554
1555 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1556 lu_gp = lu_gp_mem->lu_gp;
1557 if (lu_gp) {
1558 spin_lock(&lu_gp->lu_gp_lock);
1559 if (lu_gp_mem->lu_gp_assoc) {
1560 list_del(&lu_gp_mem->lu_gp_mem_list);
1561 lu_gp->lu_gp_members--;
1562 lu_gp_mem->lu_gp_assoc = 0;
1563 }
1564 spin_unlock(&lu_gp->lu_gp_lock);
1565 lu_gp_mem->lu_gp = NULL;
1566 }
1567 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1568
1569 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1570 }
1571
1572 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1573 {
1574 struct t10_alua_lu_gp *lu_gp;
1575 struct config_item *ci;
1576
1577 spin_lock(&lu_gps_lock);
1578 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1579 if (!lu_gp->lu_gp_valid_id)
1580 continue;
1581 ci = &lu_gp->lu_gp_group.cg_item;
1582 if (!strcmp(config_item_name(ci), name)) {
1583 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1584 spin_unlock(&lu_gps_lock);
1585 return lu_gp;
1586 }
1587 }
1588 spin_unlock(&lu_gps_lock);
1589
1590 return NULL;
1591 }
1592
1593 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1594 {
1595 spin_lock(&lu_gps_lock);
1596 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1597 spin_unlock(&lu_gps_lock);
1598 }
1599
1600 /*
1601 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1602 */
1603 void __core_alua_attach_lu_gp_mem(
1604 struct t10_alua_lu_gp_member *lu_gp_mem,
1605 struct t10_alua_lu_gp *lu_gp)
1606 {
1607 spin_lock(&lu_gp->lu_gp_lock);
1608 lu_gp_mem->lu_gp = lu_gp;
1609 lu_gp_mem->lu_gp_assoc = 1;
1610 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1611 lu_gp->lu_gp_members++;
1612 spin_unlock(&lu_gp->lu_gp_lock);
1613 }
1614
1615 /*
1616 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1617 */
1618 void __core_alua_drop_lu_gp_mem(
1619 struct t10_alua_lu_gp_member *lu_gp_mem,
1620 struct t10_alua_lu_gp *lu_gp)
1621 {
1622 spin_lock(&lu_gp->lu_gp_lock);
1623 list_del(&lu_gp_mem->lu_gp_mem_list);
1624 lu_gp_mem->lu_gp = NULL;
1625 lu_gp_mem->lu_gp_assoc = 0;
1626 lu_gp->lu_gp_members--;
1627 spin_unlock(&lu_gp->lu_gp_lock);
1628 }
1629
1630 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1631 const char *name, int def_group)
1632 {
1633 struct t10_alua_tg_pt_gp *tg_pt_gp;
1634
1635 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1636 if (!tg_pt_gp) {
1637 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1638 return NULL;
1639 }
1640 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1641 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1642 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1643 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1644 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1645 tg_pt_gp->tg_pt_gp_dev = dev;
1646 tg_pt_gp->tg_pt_gp_alua_access_state =
1647 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1648 /*
1649 * Enable both explicit and implicit ALUA support by default
1650 */
1651 tg_pt_gp->tg_pt_gp_alua_access_type =
1652 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1653 /*
1654 * Set the default Active/NonOptimized Delay in milliseconds
1655 */
1656 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1657 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1658 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1659
1660 /*
1661 * Enable all supported states
1662 */
1663 tg_pt_gp->tg_pt_gp_alua_supported_states =
1664 ALUA_T_SUP | ALUA_O_SUP |
1665 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1666
1667 if (def_group) {
1668 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1669 tg_pt_gp->tg_pt_gp_id =
1670 dev->t10_alua.alua_tg_pt_gps_counter++;
1671 tg_pt_gp->tg_pt_gp_valid_id = 1;
1672 dev->t10_alua.alua_tg_pt_gps_count++;
1673 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1674 &dev->t10_alua.tg_pt_gps_list);
1675 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1676 }
1677
1678 return tg_pt_gp;
1679 }
1680
1681 int core_alua_set_tg_pt_gp_id(
1682 struct t10_alua_tg_pt_gp *tg_pt_gp,
1683 u16 tg_pt_gp_id)
1684 {
1685 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1686 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1687 u16 tg_pt_gp_id_tmp;
1688
1689 /*
1690 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1691 */
1692 if (tg_pt_gp->tg_pt_gp_valid_id) {
1693 pr_warn("ALUA TG PT Group already has a valid ID,"
1694 " ignoring request\n");
1695 return -EINVAL;
1696 }
1697
1698 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1699 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1700 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1701 " 0x0000ffff reached\n");
1702 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1703 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1704 return -ENOSPC;
1705 }
1706 again:
1707 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1708 dev->t10_alua.alua_tg_pt_gps_counter++;
1709
1710 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1711 tg_pt_gp_list) {
1712 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1713 if (!tg_pt_gp_id)
1714 goto again;
1715
1716 pr_err("ALUA Target Port Group ID: %hu already"
1717 " exists, ignoring request\n", tg_pt_gp_id);
1718 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1719 return -EINVAL;
1720 }
1721 }
1722
1723 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1724 tg_pt_gp->tg_pt_gp_valid_id = 1;
1725 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1726 &dev->t10_alua.tg_pt_gps_list);
1727 dev->t10_alua.alua_tg_pt_gps_count++;
1728 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1729
1730 return 0;
1731 }
1732
1733 void core_alua_free_tg_pt_gp(
1734 struct t10_alua_tg_pt_gp *tg_pt_gp)
1735 {
1736 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1737 struct se_lun *lun, *next;
1738
1739 /*
1740 * Once we have reached this point, config_item_put() has already
1741 * been called from target_core_alua_drop_tg_pt_gp().
1742 *
1743 * Here we remove *tg_pt_gp from the global list so that
1744 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1745 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1746 */
1747 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1748 if (tg_pt_gp->tg_pt_gp_valid_id) {
1749 list_del(&tg_pt_gp->tg_pt_gp_list);
1750 dev->t10_alua.alua_tg_pt_gps_count--;
1751 }
1752 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1753
1754 /*
1755 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1756 * core_alua_get_tg_pt_gp_by_name() in
1757 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1758 * to be released with core_alua_put_tg_pt_gp_from_name().
1759 */
1760 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1761 cpu_relax();
1762
1763 /*
1764 * Release reference to struct t10_alua_tg_pt_gp from all associated
1765 * struct se_port.
1766 */
1767 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1768 list_for_each_entry_safe(lun, next,
1769 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1770 list_del_init(&lun->lun_tg_pt_gp_link);
1771 tg_pt_gp->tg_pt_gp_members--;
1772
1773 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1774 /*
1775 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1776 * assume we want to re-associate a given tg_pt_gp_mem with
1777 * default_tg_pt_gp.
1778 */
1779 spin_lock(&lun->lun_tg_pt_gp_lock);
1780 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1781 __target_attach_tg_pt_gp(lun,
1782 dev->t10_alua.default_tg_pt_gp);
1783 } else
1784 lun->lun_tg_pt_gp = NULL;
1785 spin_unlock(&lun->lun_tg_pt_gp_lock);
1786
1787 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1788 }
1789 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1790
1791 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1792 }
1793
1794 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1795 struct se_device *dev, const char *name)
1796 {
1797 struct t10_alua_tg_pt_gp *tg_pt_gp;
1798 struct config_item *ci;
1799
1800 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1801 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1802 tg_pt_gp_list) {
1803 if (!tg_pt_gp->tg_pt_gp_valid_id)
1804 continue;
1805 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1806 if (!strcmp(config_item_name(ci), name)) {
1807 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1808 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1809 return tg_pt_gp;
1810 }
1811 }
1812 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1813
1814 return NULL;
1815 }
1816
1817 static void core_alua_put_tg_pt_gp_from_name(
1818 struct t10_alua_tg_pt_gp *tg_pt_gp)
1819 {
1820 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1821
1822 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1823 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1824 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1825 }
1826
1827 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1828 struct t10_alua_tg_pt_gp *tg_pt_gp)
1829 {
1830 struct se_dev_entry *se_deve;
1831
1832 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1833
1834 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1835 lun->lun_tg_pt_gp = tg_pt_gp;
1836 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1837 tg_pt_gp->tg_pt_gp_members++;
1838 spin_lock(&lun->lun_deve_lock);
1839 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1840 core_scsi3_ua_allocate(se_deve, 0x3f,
1841 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1842 spin_unlock(&lun->lun_deve_lock);
1843 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1844 }
1845
1846 void target_attach_tg_pt_gp(struct se_lun *lun,
1847 struct t10_alua_tg_pt_gp *tg_pt_gp)
1848 {
1849 spin_lock(&lun->lun_tg_pt_gp_lock);
1850 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1851 spin_unlock(&lun->lun_tg_pt_gp_lock);
1852 }
1853
1854 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1855 struct t10_alua_tg_pt_gp *tg_pt_gp)
1856 {
1857 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1858
1859 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1860 list_del_init(&lun->lun_tg_pt_gp_link);
1861 tg_pt_gp->tg_pt_gp_members--;
1862 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1863
1864 lun->lun_tg_pt_gp = NULL;
1865 }
1866
1867 void target_detach_tg_pt_gp(struct se_lun *lun)
1868 {
1869 struct t10_alua_tg_pt_gp *tg_pt_gp;
1870
1871 spin_lock(&lun->lun_tg_pt_gp_lock);
1872 tg_pt_gp = lun->lun_tg_pt_gp;
1873 if (tg_pt_gp)
1874 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1875 spin_unlock(&lun->lun_tg_pt_gp_lock);
1876 }
1877
1878 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1879 {
1880 struct config_item *tg_pt_ci;
1881 struct t10_alua_tg_pt_gp *tg_pt_gp;
1882 ssize_t len = 0;
1883
1884 spin_lock(&lun->lun_tg_pt_gp_lock);
1885 tg_pt_gp = lun->lun_tg_pt_gp;
1886 if (tg_pt_gp) {
1887 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1888 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1889 " %hu\nTG Port Primary Access State: %s\nTG Port "
1890 "Primary Access Status: %s\nTG Port Secondary Access"
1891 " State: %s\nTG Port Secondary Access Status: %s\n",
1892 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1893 core_alua_dump_state(
1894 tg_pt_gp->tg_pt_gp_alua_access_state),
1895 core_alua_dump_status(
1896 tg_pt_gp->tg_pt_gp_alua_access_status),
1897 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1898 "Offline" : "None",
1899 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1900 }
1901 spin_unlock(&lun->lun_tg_pt_gp_lock);
1902
1903 return len;
1904 }
1905
1906 ssize_t core_alua_store_tg_pt_gp_info(
1907 struct se_lun *lun,
1908 const char *page,
1909 size_t count)
1910 {
1911 struct se_portal_group *tpg = lun->lun_tpg;
1912 /*
1913 * rcu_dereference_raw protected by se_lun->lun_group symlink
1914 * reference to se_device->dev_group.
1915 */
1916 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1917 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1918 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1919 int move = 0;
1920
1921 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1922 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1923 return -ENODEV;
1924
1925 if (count > TG_PT_GROUP_NAME_BUF) {
1926 pr_err("ALUA Target Port Group alias too large!\n");
1927 return -EINVAL;
1928 }
1929 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1930 memcpy(buf, page, count);
1931 /*
1932 * Any ALUA target port group alias besides "NULL" means we will be
1933 * making a new group association.
1934 */
1935 if (strcmp(strstrip(buf), "NULL")) {
1936 /*
1937 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1938 * struct t10_alua_tg_pt_gp. This reference is released with
1939 * core_alua_put_tg_pt_gp_from_name() below.
1940 */
1941 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1942 strstrip(buf));
1943 if (!tg_pt_gp_new)
1944 return -ENODEV;
1945 }
1946
1947 spin_lock(&lun->lun_tg_pt_gp_lock);
1948 tg_pt_gp = lun->lun_tg_pt_gp;
1949 if (tg_pt_gp) {
1950 /*
1951 * Clearing an existing tg_pt_gp association, and replacing
1952 * with the default_tg_pt_gp.
1953 */
1954 if (!tg_pt_gp_new) {
1955 pr_debug("Target_Core_ConfigFS: Moving"
1956 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1957 " alua/%s, ID: %hu back to"
1958 " default_tg_pt_gp\n",
1959 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1960 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1961 config_item_name(&lun->lun_group.cg_item),
1962 config_item_name(
1963 &tg_pt_gp->tg_pt_gp_group.cg_item),
1964 tg_pt_gp->tg_pt_gp_id);
1965
1966 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1967 __target_attach_tg_pt_gp(lun,
1968 dev->t10_alua.default_tg_pt_gp);
1969 spin_unlock(&lun->lun_tg_pt_gp_lock);
1970
1971 return count;
1972 }
1973 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1974 move = 1;
1975 }
1976
1977 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
1978 spin_unlock(&lun->lun_tg_pt_gp_lock);
1979 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1980 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1981 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1982 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1983 config_item_name(&lun->lun_group.cg_item),
1984 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1985 tg_pt_gp_new->tg_pt_gp_id);
1986
1987 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1988 return count;
1989 }
1990
1991 ssize_t core_alua_show_access_type(
1992 struct t10_alua_tg_pt_gp *tg_pt_gp,
1993 char *page)
1994 {
1995 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
1996 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
1997 return sprintf(page, "Implicit and Explicit\n");
1998 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
1999 return sprintf(page, "Implicit\n");
2000 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2001 return sprintf(page, "Explicit\n");
2002 else
2003 return sprintf(page, "None\n");
2004 }
2005
2006 ssize_t core_alua_store_access_type(
2007 struct t10_alua_tg_pt_gp *tg_pt_gp,
2008 const char *page,
2009 size_t count)
2010 {
2011 unsigned long tmp;
2012 int ret;
2013
2014 ret = kstrtoul(page, 0, &tmp);
2015 if (ret < 0) {
2016 pr_err("Unable to extract alua_access_type\n");
2017 return ret;
2018 }
2019 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2020 pr_err("Illegal value for alua_access_type:"
2021 " %lu\n", tmp);
2022 return -EINVAL;
2023 }
2024 if (tmp == 3)
2025 tg_pt_gp->tg_pt_gp_alua_access_type =
2026 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2027 else if (tmp == 2)
2028 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2029 else if (tmp == 1)
2030 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2031 else
2032 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2033
2034 return count;
2035 }
2036
2037 ssize_t core_alua_show_nonop_delay_msecs(
2038 struct t10_alua_tg_pt_gp *tg_pt_gp,
2039 char *page)
2040 {
2041 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2042 }
2043
2044 ssize_t core_alua_store_nonop_delay_msecs(
2045 struct t10_alua_tg_pt_gp *tg_pt_gp,
2046 const char *page,
2047 size_t count)
2048 {
2049 unsigned long tmp;
2050 int ret;
2051
2052 ret = kstrtoul(page, 0, &tmp);
2053 if (ret < 0) {
2054 pr_err("Unable to extract nonop_delay_msecs\n");
2055 return ret;
2056 }
2057 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2058 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2059 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2060 ALUA_MAX_NONOP_DELAY_MSECS);
2061 return -EINVAL;
2062 }
2063 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2064
2065 return count;
2066 }
2067
2068 ssize_t core_alua_show_trans_delay_msecs(
2069 struct t10_alua_tg_pt_gp *tg_pt_gp,
2070 char *page)
2071 {
2072 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2073 }
2074
2075 ssize_t core_alua_store_trans_delay_msecs(
2076 struct t10_alua_tg_pt_gp *tg_pt_gp,
2077 const char *page,
2078 size_t count)
2079 {
2080 unsigned long tmp;
2081 int ret;
2082
2083 ret = kstrtoul(page, 0, &tmp);
2084 if (ret < 0) {
2085 pr_err("Unable to extract trans_delay_msecs\n");
2086 return ret;
2087 }
2088 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2089 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2090 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2091 ALUA_MAX_TRANS_DELAY_MSECS);
2092 return -EINVAL;
2093 }
2094 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2095
2096 return count;
2097 }
2098
2099 ssize_t core_alua_show_implicit_trans_secs(
2100 struct t10_alua_tg_pt_gp *tg_pt_gp,
2101 char *page)
2102 {
2103 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2104 }
2105
2106 ssize_t core_alua_store_implicit_trans_secs(
2107 struct t10_alua_tg_pt_gp *tg_pt_gp,
2108 const char *page,
2109 size_t count)
2110 {
2111 unsigned long tmp;
2112 int ret;
2113
2114 ret = kstrtoul(page, 0, &tmp);
2115 if (ret < 0) {
2116 pr_err("Unable to extract implicit_trans_secs\n");
2117 return ret;
2118 }
2119 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2120 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2121 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2122 ALUA_MAX_IMPLICIT_TRANS_SECS);
2123 return -EINVAL;
2124 }
2125 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2126
2127 return count;
2128 }
2129
2130 ssize_t core_alua_show_preferred_bit(
2131 struct t10_alua_tg_pt_gp *tg_pt_gp,
2132 char *page)
2133 {
2134 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2135 }
2136
2137 ssize_t core_alua_store_preferred_bit(
2138 struct t10_alua_tg_pt_gp *tg_pt_gp,
2139 const char *page,
2140 size_t count)
2141 {
2142 unsigned long tmp;
2143 int ret;
2144
2145 ret = kstrtoul(page, 0, &tmp);
2146 if (ret < 0) {
2147 pr_err("Unable to extract preferred ALUA value\n");
2148 return ret;
2149 }
2150 if ((tmp != 0) && (tmp != 1)) {
2151 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2152 return -EINVAL;
2153 }
2154 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2155
2156 return count;
2157 }
2158
2159 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2160 {
2161 return sprintf(page, "%d\n",
2162 atomic_read(&lun->lun_tg_pt_secondary_offline));
2163 }
2164
2165 ssize_t core_alua_store_offline_bit(
2166 struct se_lun *lun,
2167 const char *page,
2168 size_t count)
2169 {
2170 /*
2171 * rcu_dereference_raw protected by se_lun->lun_group symlink
2172 * reference to se_device->dev_group.
2173 */
2174 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2175 unsigned long tmp;
2176 int ret;
2177
2178 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2179 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2180 return -ENODEV;
2181
2182 ret = kstrtoul(page, 0, &tmp);
2183 if (ret < 0) {
2184 pr_err("Unable to extract alua_tg_pt_offline value\n");
2185 return ret;
2186 }
2187 if ((tmp != 0) && (tmp != 1)) {
2188 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2189 tmp);
2190 return -EINVAL;
2191 }
2192
2193 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2194 if (ret < 0)
2195 return -EINVAL;
2196
2197 return count;
2198 }
2199
2200 ssize_t core_alua_show_secondary_status(
2201 struct se_lun *lun,
2202 char *page)
2203 {
2204 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2205 }
2206
2207 ssize_t core_alua_store_secondary_status(
2208 struct se_lun *lun,
2209 const char *page,
2210 size_t count)
2211 {
2212 unsigned long tmp;
2213 int ret;
2214
2215 ret = kstrtoul(page, 0, &tmp);
2216 if (ret < 0) {
2217 pr_err("Unable to extract alua_tg_pt_status\n");
2218 return ret;
2219 }
2220 if ((tmp != ALUA_STATUS_NONE) &&
2221 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2222 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2223 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2224 tmp);
2225 return -EINVAL;
2226 }
2227 lun->lun_tg_pt_secondary_stat = (int)tmp;
2228
2229 return count;
2230 }
2231
2232 ssize_t core_alua_show_secondary_write_metadata(
2233 struct se_lun *lun,
2234 char *page)
2235 {
2236 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2237 }
2238
2239 ssize_t core_alua_store_secondary_write_metadata(
2240 struct se_lun *lun,
2241 const char *page,
2242 size_t count)
2243 {
2244 unsigned long tmp;
2245 int ret;
2246
2247 ret = kstrtoul(page, 0, &tmp);
2248 if (ret < 0) {
2249 pr_err("Unable to extract alua_tg_pt_write_md\n");
2250 return ret;
2251 }
2252 if ((tmp != 0) && (tmp != 1)) {
2253 pr_err("Illegal value for alua_tg_pt_write_md:"
2254 " %lu\n", tmp);
2255 return -EINVAL;
2256 }
2257 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2258
2259 return count;
2260 }
2261
2262 int core_setup_alua(struct se_device *dev)
2263 {
2264 if (!(dev->transport_flags &
2265 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2266 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2267 struct t10_alua_lu_gp_member *lu_gp_mem;
2268
2269 /*
2270 * Associate this struct se_device with the default ALUA
2271 * LUN Group.
2272 */
2273 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2274 if (IS_ERR(lu_gp_mem))
2275 return PTR_ERR(lu_gp_mem);
2276
2277 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2278 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2279 default_lu_gp);
2280 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2281
2282 pr_debug("%s: Adding to default ALUA LU Group:"
2283 " core/alua/lu_gps/default_lu_gp\n",
2284 dev->transport->name);
2285 }
2286
2287 return 0;
2288 }
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