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1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/export.h>
30 #include <linux/file.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_configfs.h>
39
40 #include "target_core_internal.h"
41 #include "target_core_alua.h"
42 #include "target_core_ua.h"
43
44 static sense_reason_t core_alua_check_transition(int state, int valid,
45 int *primary);
46 static int core_alua_set_tg_pt_secondary_state(
47 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
48 struct se_port *port, int explicit, int offline);
49
50 static char *core_alua_dump_state(int state);
51
52 static u16 alua_lu_gps_counter;
53 static u32 alua_lu_gps_count;
54
55 static DEFINE_SPINLOCK(lu_gps_lock);
56 static LIST_HEAD(lu_gps_list);
57
58 struct t10_alua_lu_gp *default_lu_gp;
59
60 /*
61 * REPORT REFERRALS
62 *
63 * See sbc3r35 section 5.23
64 */
65 sense_reason_t
66 target_emulate_report_referrals(struct se_cmd *cmd)
67 {
68 struct se_device *dev = cmd->se_dev;
69 struct t10_alua_lba_map *map;
70 struct t10_alua_lba_map_member *map_mem;
71 unsigned char *buf;
72 u32 rd_len = 0, off;
73
74 if (cmd->data_length < 4) {
75 pr_warn("REPORT REFERRALS allocation length %u too"
76 " small\n", cmd->data_length);
77 return TCM_INVALID_CDB_FIELD;
78 }
79
80 buf = transport_kmap_data_sg(cmd);
81 if (!buf)
82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
83
84 off = 4;
85 spin_lock(&dev->t10_alua.lba_map_lock);
86 if (list_empty(&dev->t10_alua.lba_map_list)) {
87 spin_unlock(&dev->t10_alua.lba_map_lock);
88 transport_kunmap_data_sg(cmd);
89
90 return TCM_UNSUPPORTED_SCSI_OPCODE;
91 }
92
93 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
94 lba_map_list) {
95 int desc_num = off + 3;
96 int pg_num;
97
98 off += 4;
99 if (cmd->data_length > off)
100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
101 off += 8;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
104 off += 8;
105 rd_len += 20;
106 pg_num = 0;
107 list_for_each_entry(map_mem, &map->lba_map_mem_list,
108 lba_map_mem_list) {
109 int alua_state = map_mem->lba_map_mem_alua_state;
110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
111
112 if (cmd->data_length > off)
113 buf[off] = alua_state & 0x0f;
114 off += 2;
115 if (cmd->data_length > off)
116 buf[off] = (alua_pg_id >> 8) & 0xff;
117 off++;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id & 0xff);
120 off++;
121 rd_len += 4;
122 pg_num++;
123 }
124 if (cmd->data_length > desc_num)
125 buf[desc_num] = pg_num;
126 }
127 spin_unlock(&dev->t10_alua.lba_map_lock);
128
129 /*
130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
131 */
132 put_unaligned_be16(rd_len, &buf[2]);
133
134 transport_kunmap_data_sg(cmd);
135
136 target_complete_cmd(cmd, GOOD);
137 return 0;
138 }
139
140 /*
141 * REPORT_TARGET_PORT_GROUPS
142 *
143 * See spc4r17 section 6.27
144 */
145 sense_reason_t
146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 {
148 struct se_device *dev = cmd->se_dev;
149 struct se_port *port;
150 struct t10_alua_tg_pt_gp *tg_pt_gp;
151 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
152 unsigned char *buf;
153 u32 rd_len = 0, off;
154 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
155
156 /*
157 * Skip over RESERVED area to first Target port group descriptor
158 * depending on the PARAMETER DATA FORMAT type..
159 */
160 if (ext_hdr != 0)
161 off = 8;
162 else
163 off = 4;
164
165 if (cmd->data_length < off) {
166 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
167 " small for %s header\n", cmd->data_length,
168 (ext_hdr) ? "extended" : "normal");
169 return TCM_INVALID_CDB_FIELD;
170 }
171 buf = transport_kmap_data_sg(cmd);
172 if (!buf)
173 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
174
175 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
176 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
177 tg_pt_gp_list) {
178 /*
179 * Check if the Target port group and Target port descriptor list
180 * based on tg_pt_gp_members count will fit into the response payload.
181 * Otherwise, bump rd_len to let the initiator know we have exceeded
182 * the allocation length and the response is truncated.
183 */
184 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
185 cmd->data_length) {
186 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
187 continue;
188 }
189 /*
190 * PREF: Preferred target port bit, determine if this
191 * bit should be set for port group.
192 */
193 if (tg_pt_gp->tg_pt_gp_pref)
194 buf[off] = 0x80;
195 /*
196 * Set the ASYMMETRIC ACCESS State
197 */
198 buf[off++] |= (atomic_read(
199 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
200 /*
201 * Set supported ASYMMETRIC ACCESS State bits
202 */
203 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
204 /*
205 * TARGET PORT GROUP
206 */
207 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
208 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
209
210 off++; /* Skip over Reserved */
211 /*
212 * STATUS CODE
213 */
214 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
215 /*
216 * Vendor Specific field
217 */
218 buf[off++] = 0x00;
219 /*
220 * TARGET PORT COUNT
221 */
222 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
223 rd_len += 8;
224
225 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
226 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
227 tg_pt_gp_mem_list) {
228 port = tg_pt_gp_mem->tg_pt;
229 /*
230 * Start Target Port descriptor format
231 *
232 * See spc4r17 section 6.2.7 Table 247
233 */
234 off += 2; /* Skip over Obsolete */
235 /*
236 * Set RELATIVE TARGET PORT IDENTIFIER
237 */
238 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
239 buf[off++] = (port->sep_rtpi & 0xff);
240 rd_len += 4;
241 }
242 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
243 }
244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
245 /*
246 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
247 */
248 put_unaligned_be32(rd_len, &buf[0]);
249
250 /*
251 * Fill in the Extended header parameter data format if requested
252 */
253 if (ext_hdr != 0) {
254 buf[4] = 0x10;
255 /*
256 * Set the implicit transition time (in seconds) for the application
257 * client to use as a base for it's transition timeout value.
258 *
259 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
260 * this CDB was received upon to determine this value individually
261 * for ALUA target port group.
262 */
263 port = cmd->se_lun->lun_sep;
264 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
265 if (tg_pt_gp_mem) {
266 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
267 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
268 if (tg_pt_gp)
269 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
270 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
271 }
272 }
273 transport_kunmap_data_sg(cmd);
274
275 target_complete_cmd(cmd, GOOD);
276 return 0;
277 }
278
279 /*
280 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
281 *
282 * See spc4r17 section 6.35
283 */
284 sense_reason_t
285 target_emulate_set_target_port_groups(struct se_cmd *cmd)
286 {
287 struct se_device *dev = cmd->se_dev;
288 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
289 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
290 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
291 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
292 unsigned char *buf;
293 unsigned char *ptr;
294 sense_reason_t rc = TCM_NO_SENSE;
295 u32 len = 4; /* Skip over RESERVED area in header */
296 int alua_access_state, primary = 0, valid_states;
297 u16 tg_pt_id, rtpi;
298
299 if (!l_port)
300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
301
302 if (cmd->data_length < 4) {
303 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
304 " small\n", cmd->data_length);
305 return TCM_INVALID_PARAMETER_LIST;
306 }
307
308 buf = transport_kmap_data_sg(cmd);
309 if (!buf)
310 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
311
312 /*
313 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
314 * for the local tg_pt_gp.
315 */
316 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
317 if (!l_tg_pt_gp_mem) {
318 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
319 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
320 goto out;
321 }
322 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
323 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
324 if (!l_tg_pt_gp) {
325 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
326 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
327 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
328 goto out;
329 }
330 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
331
332 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
333 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
334 " while TPGS_EXPLICIT_ALUA is disabled\n");
335 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
336 goto out;
337 }
338 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
339
340 ptr = &buf[4]; /* Skip over RESERVED area in header */
341
342 while (len < cmd->data_length) {
343 bool found = false;
344 alua_access_state = (ptr[0] & 0x0f);
345 /*
346 * Check the received ALUA access state, and determine if
347 * the state is a primary or secondary target port asymmetric
348 * access state.
349 */
350 rc = core_alua_check_transition(alua_access_state,
351 valid_states, &primary);
352 if (rc) {
353 /*
354 * If the SET TARGET PORT GROUPS attempts to establish
355 * an invalid combination of target port asymmetric
356 * access states or attempts to establish an
357 * unsupported target port asymmetric access state,
358 * then the command shall be terminated with CHECK
359 * CONDITION status, with the sense key set to ILLEGAL
360 * REQUEST, and the additional sense code set to INVALID
361 * FIELD IN PARAMETER LIST.
362 */
363 goto out;
364 }
365
366 /*
367 * If the ASYMMETRIC ACCESS STATE field (see table 267)
368 * specifies a primary target port asymmetric access state,
369 * then the TARGET PORT GROUP OR TARGET PORT field specifies
370 * a primary target port group for which the primary target
371 * port asymmetric access state shall be changed. If the
372 * ASYMMETRIC ACCESS STATE field specifies a secondary target
373 * port asymmetric access state, then the TARGET PORT GROUP OR
374 * TARGET PORT field specifies the relative target port
375 * identifier (see 3.1.120) of the target port for which the
376 * secondary target port asymmetric access state shall be
377 * changed.
378 */
379 if (primary) {
380 tg_pt_id = get_unaligned_be16(ptr + 2);
381 /*
382 * Locate the matching target port group ID from
383 * the global tg_pt_gp list
384 */
385 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
386 list_for_each_entry(tg_pt_gp,
387 &dev->t10_alua.tg_pt_gps_list,
388 tg_pt_gp_list) {
389 if (!tg_pt_gp->tg_pt_gp_valid_id)
390 continue;
391
392 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
393 continue;
394
395 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
396 smp_mb__after_atomic_inc();
397
398 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
399
400 if (!core_alua_do_port_transition(tg_pt_gp,
401 dev, l_port, nacl,
402 alua_access_state, 1))
403 found = true;
404
405 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
406 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
407 smp_mb__after_atomic_dec();
408 break;
409 }
410 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
411 } else {
412 /*
413 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
414 * the Target Port in question for the the incoming
415 * SET_TARGET_PORT_GROUPS op.
416 */
417 rtpi = get_unaligned_be16(ptr + 2);
418 /*
419 * Locate the matching relative target port identifier
420 * for the struct se_device storage object.
421 */
422 spin_lock(&dev->se_port_lock);
423 list_for_each_entry(port, &dev->dev_sep_list,
424 sep_list) {
425 if (port->sep_rtpi != rtpi)
426 continue;
427
428 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
429
430 spin_unlock(&dev->se_port_lock);
431
432 if (!core_alua_set_tg_pt_secondary_state(
433 tg_pt_gp_mem, port, 1, 1))
434 found = true;
435
436 spin_lock(&dev->se_port_lock);
437 break;
438 }
439 spin_unlock(&dev->se_port_lock);
440 }
441
442 if (!found) {
443 rc = TCM_INVALID_PARAMETER_LIST;
444 goto out;
445 }
446
447 ptr += 4;
448 len += 4;
449 }
450
451 out:
452 transport_kunmap_data_sg(cmd);
453 if (!rc)
454 target_complete_cmd(cmd, GOOD);
455 return rc;
456 }
457
458 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
459 {
460 /*
461 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
462 * The ALUA additional sense code qualifier (ASCQ) is determined
463 * by the ALUA primary or secondary access state..
464 */
465 pr_debug("[%s]: ALUA TG Port not available, "
466 "SenseKey: NOT_READY, ASC/ASCQ: "
467 "0x04/0x%02x\n",
468 cmd->se_tfo->get_fabric_name(), alua_ascq);
469
470 cmd->scsi_asc = 0x04;
471 cmd->scsi_ascq = alua_ascq;
472 }
473
474 static inline void core_alua_state_nonoptimized(
475 struct se_cmd *cmd,
476 unsigned char *cdb,
477 int nonop_delay_msecs)
478 {
479 /*
480 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
481 * later to determine if processing of this cmd needs to be
482 * temporarily delayed for the Active/NonOptimized primary access state.
483 */
484 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
485 cmd->alua_nonop_delay = nonop_delay_msecs;
486 }
487
488 static inline int core_alua_state_lba_dependent(
489 struct se_cmd *cmd,
490 struct t10_alua_tg_pt_gp *tg_pt_gp)
491 {
492 struct se_device *dev = cmd->se_dev;
493 u64 segment_size, segment_mult, sectors, lba;
494
495 /* Only need to check for cdb actually containing LBAs */
496 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
497 return 0;
498
499 spin_lock(&dev->t10_alua.lba_map_lock);
500 segment_size = dev->t10_alua.lba_map_segment_size;
501 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
502 sectors = cmd->data_length / dev->dev_attrib.block_size;
503
504 lba = cmd->t_task_lba;
505 while (lba < cmd->t_task_lba + sectors) {
506 struct t10_alua_lba_map *cur_map = NULL, *map;
507 struct t10_alua_lba_map_member *map_mem;
508
509 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
510 lba_map_list) {
511 u64 start_lba, last_lba;
512 u64 first_lba = map->lba_map_first_lba;
513
514 if (segment_mult) {
515 u64 tmp = lba;
516 start_lba = do_div(tmp, segment_size * segment_mult);
517
518 last_lba = first_lba + segment_size - 1;
519 if (start_lba >= first_lba &&
520 start_lba <= last_lba) {
521 lba += segment_size;
522 cur_map = map;
523 break;
524 }
525 } else {
526 last_lba = map->lba_map_last_lba;
527 if (lba >= first_lba && lba <= last_lba) {
528 lba = last_lba + 1;
529 cur_map = map;
530 break;
531 }
532 }
533 }
534 if (!cur_map) {
535 spin_unlock(&dev->t10_alua.lba_map_lock);
536 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
537 return 1;
538 }
539 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
540 lba_map_mem_list) {
541 if (map_mem->lba_map_mem_alua_pg_id !=
542 tg_pt_gp->tg_pt_gp_id)
543 continue;
544 switch(map_mem->lba_map_mem_alua_state) {
545 case ALUA_ACCESS_STATE_STANDBY:
546 spin_unlock(&dev->t10_alua.lba_map_lock);
547 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
548 return 1;
549 case ALUA_ACCESS_STATE_UNAVAILABLE:
550 spin_unlock(&dev->t10_alua.lba_map_lock);
551 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
552 return 1;
553 default:
554 break;
555 }
556 }
557 }
558 spin_unlock(&dev->t10_alua.lba_map_lock);
559 return 0;
560 }
561
562 static inline int core_alua_state_standby(
563 struct se_cmd *cmd,
564 unsigned char *cdb)
565 {
566 /*
567 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
568 * spc4r17 section 5.9.2.4.4
569 */
570 switch (cdb[0]) {
571 case INQUIRY:
572 case LOG_SELECT:
573 case LOG_SENSE:
574 case MODE_SELECT:
575 case MODE_SENSE:
576 case REPORT_LUNS:
577 case RECEIVE_DIAGNOSTIC:
578 case SEND_DIAGNOSTIC:
579 return 0;
580 case MAINTENANCE_IN:
581 switch (cdb[1] & 0x1f) {
582 case MI_REPORT_TARGET_PGS:
583 return 0;
584 default:
585 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
586 return 1;
587 }
588 case MAINTENANCE_OUT:
589 switch (cdb[1]) {
590 case MO_SET_TARGET_PGS:
591 return 0;
592 default:
593 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
594 return 1;
595 }
596 case REQUEST_SENSE:
597 case PERSISTENT_RESERVE_IN:
598 case PERSISTENT_RESERVE_OUT:
599 case READ_BUFFER:
600 case WRITE_BUFFER:
601 return 0;
602 default:
603 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
604 return 1;
605 }
606
607 return 0;
608 }
609
610 static inline int core_alua_state_unavailable(
611 struct se_cmd *cmd,
612 unsigned char *cdb)
613 {
614 /*
615 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
616 * spc4r17 section 5.9.2.4.5
617 */
618 switch (cdb[0]) {
619 case INQUIRY:
620 case REPORT_LUNS:
621 return 0;
622 case MAINTENANCE_IN:
623 switch (cdb[1] & 0x1f) {
624 case MI_REPORT_TARGET_PGS:
625 return 0;
626 default:
627 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
628 return 1;
629 }
630 case MAINTENANCE_OUT:
631 switch (cdb[1]) {
632 case MO_SET_TARGET_PGS:
633 return 0;
634 default:
635 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
636 return 1;
637 }
638 case REQUEST_SENSE:
639 case READ_BUFFER:
640 case WRITE_BUFFER:
641 return 0;
642 default:
643 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
644 return 1;
645 }
646
647 return 0;
648 }
649
650 static inline int core_alua_state_transition(
651 struct se_cmd *cmd,
652 unsigned char *cdb)
653 {
654 /*
655 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
656 * spc4r17 section 5.9.2.5
657 */
658 switch (cdb[0]) {
659 case INQUIRY:
660 case REPORT_LUNS:
661 return 0;
662 case MAINTENANCE_IN:
663 switch (cdb[1] & 0x1f) {
664 case MI_REPORT_TARGET_PGS:
665 return 0;
666 default:
667 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
668 return 1;
669 }
670 case REQUEST_SENSE:
671 case READ_BUFFER:
672 case WRITE_BUFFER:
673 return 0;
674 default:
675 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
676 return 1;
677 }
678
679 return 0;
680 }
681
682 /*
683 * return 1: Is used to signal LUN not accessible, and check condition/not ready
684 * return 0: Used to signal success
685 * return -1: Used to signal failure, and invalid cdb field
686 */
687 sense_reason_t
688 target_alua_state_check(struct se_cmd *cmd)
689 {
690 struct se_device *dev = cmd->se_dev;
691 unsigned char *cdb = cmd->t_task_cdb;
692 struct se_lun *lun = cmd->se_lun;
693 struct se_port *port = lun->lun_sep;
694 struct t10_alua_tg_pt_gp *tg_pt_gp;
695 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
696 int out_alua_state, nonop_delay_msecs;
697
698 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
699 return 0;
700 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
701 return 0;
702
703 if (!port)
704 return 0;
705 /*
706 * First, check for a struct se_port specific secondary ALUA target port
707 * access state: OFFLINE
708 */
709 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
710 pr_debug("ALUA: Got secondary offline status for local"
711 " target port\n");
712 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
713 return TCM_CHECK_CONDITION_NOT_READY;
714 }
715 /*
716 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
717 * ALUA target port group, to obtain current ALUA access state.
718 * Otherwise look for the underlying struct se_device association with
719 * a ALUA logical unit group.
720 */
721 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
722 if (!tg_pt_gp_mem)
723 return 0;
724
725 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
726 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
727 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
728 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
729 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
730 /*
731 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
732 * statement so the compiler knows explicitly to check this case first.
733 * For the Optimized ALUA access state case, we want to process the
734 * incoming fabric cmd ASAP..
735 */
736 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
737 return 0;
738
739 switch (out_alua_state) {
740 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
741 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
742 break;
743 case ALUA_ACCESS_STATE_STANDBY:
744 if (core_alua_state_standby(cmd, cdb))
745 return TCM_CHECK_CONDITION_NOT_READY;
746 break;
747 case ALUA_ACCESS_STATE_UNAVAILABLE:
748 if (core_alua_state_unavailable(cmd, cdb))
749 return TCM_CHECK_CONDITION_NOT_READY;
750 break;
751 case ALUA_ACCESS_STATE_TRANSITION:
752 if (core_alua_state_transition(cmd, cdb))
753 return TCM_CHECK_CONDITION_NOT_READY;
754 break;
755 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
756 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
757 return TCM_CHECK_CONDITION_NOT_READY;
758 break;
759 /*
760 * OFFLINE is a secondary ALUA target port group access state, that is
761 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
762 */
763 case ALUA_ACCESS_STATE_OFFLINE:
764 default:
765 pr_err("Unknown ALUA access state: 0x%02x\n",
766 out_alua_state);
767 return TCM_INVALID_CDB_FIELD;
768 }
769
770 return 0;
771 }
772
773 /*
774 * Check implicit and explicit ALUA state change request.
775 */
776 static sense_reason_t
777 core_alua_check_transition(int state, int valid, int *primary)
778 {
779 /*
780 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
781 * defined as primary target port asymmetric access states.
782 */
783 switch (state) {
784 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
785 if (!(valid & ALUA_AO_SUP))
786 goto not_supported;
787 *primary = 1;
788 break;
789 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
790 if (!(valid & ALUA_AN_SUP))
791 goto not_supported;
792 *primary = 1;
793 break;
794 case ALUA_ACCESS_STATE_STANDBY:
795 if (!(valid & ALUA_S_SUP))
796 goto not_supported;
797 *primary = 1;
798 break;
799 case ALUA_ACCESS_STATE_UNAVAILABLE:
800 if (!(valid & ALUA_U_SUP))
801 goto not_supported;
802 *primary = 1;
803 break;
804 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
805 if (!(valid & ALUA_LBD_SUP))
806 goto not_supported;
807 *primary = 1;
808 break;
809 case ALUA_ACCESS_STATE_OFFLINE:
810 /*
811 * OFFLINE state is defined as a secondary target port
812 * asymmetric access state.
813 */
814 if (!(valid & ALUA_O_SUP))
815 goto not_supported;
816 *primary = 0;
817 break;
818 case ALUA_ACCESS_STATE_TRANSITION:
819 /*
820 * Transitioning is set internally, and
821 * cannot be selected manually.
822 */
823 goto not_supported;
824 default:
825 pr_err("Unknown ALUA access state: 0x%02x\n", state);
826 return TCM_INVALID_PARAMETER_LIST;
827 }
828
829 return 0;
830
831 not_supported:
832 pr_err("ALUA access state %s not supported",
833 core_alua_dump_state(state));
834 return TCM_INVALID_PARAMETER_LIST;
835 }
836
837 static char *core_alua_dump_state(int state)
838 {
839 switch (state) {
840 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
841 return "Active/Optimized";
842 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
843 return "Active/NonOptimized";
844 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
845 return "LBA Dependent";
846 case ALUA_ACCESS_STATE_STANDBY:
847 return "Standby";
848 case ALUA_ACCESS_STATE_UNAVAILABLE:
849 return "Unavailable";
850 case ALUA_ACCESS_STATE_OFFLINE:
851 return "Offline";
852 case ALUA_ACCESS_STATE_TRANSITION:
853 return "Transitioning";
854 default:
855 return "Unknown";
856 }
857
858 return NULL;
859 }
860
861 char *core_alua_dump_status(int status)
862 {
863 switch (status) {
864 case ALUA_STATUS_NONE:
865 return "None";
866 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
867 return "Altered by Explicit STPG";
868 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
869 return "Altered by Implicit ALUA";
870 default:
871 return "Unknown";
872 }
873
874 return NULL;
875 }
876
877 /*
878 * Used by fabric modules to determine when we need to delay processing
879 * for the Active/NonOptimized paths..
880 */
881 int core_alua_check_nonop_delay(
882 struct se_cmd *cmd)
883 {
884 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
885 return 0;
886 if (in_interrupt())
887 return 0;
888 /*
889 * The ALUA Active/NonOptimized access state delay can be disabled
890 * in via configfs with a value of zero
891 */
892 if (!cmd->alua_nonop_delay)
893 return 0;
894 /*
895 * struct se_cmd->alua_nonop_delay gets set by a target port group
896 * defined interval in core_alua_state_nonoptimized()
897 */
898 msleep_interruptible(cmd->alua_nonop_delay);
899 return 0;
900 }
901 EXPORT_SYMBOL(core_alua_check_nonop_delay);
902
903 /*
904 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
905 *
906 */
907 static int core_alua_write_tpg_metadata(
908 const char *path,
909 unsigned char *md_buf,
910 u32 md_buf_len)
911 {
912 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
913 int ret;
914
915 if (IS_ERR(file)) {
916 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
917 return -ENODEV;
918 }
919 ret = kernel_write(file, md_buf, md_buf_len, 0);
920 if (ret < 0)
921 pr_err("Error writing ALUA metadata file: %s\n", path);
922 fput(file);
923 return (ret < 0) ? -EIO : 0;
924 }
925
926 /*
927 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
928 */
929 static int core_alua_update_tpg_primary_metadata(
930 struct t10_alua_tg_pt_gp *tg_pt_gp)
931 {
932 unsigned char *md_buf;
933 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
934 char path[ALUA_METADATA_PATH_LEN];
935 int len, rc;
936
937 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
938 if (!md_buf) {
939 pr_err("Unable to allocate buf for ALUA metadata\n");
940 return -ENOMEM;
941 }
942
943 memset(path, 0, ALUA_METADATA_PATH_LEN);
944
945 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
946 "tg_pt_gp_id=%hu\n"
947 "alua_access_state=0x%02x\n"
948 "alua_access_status=0x%02x\n",
949 tg_pt_gp->tg_pt_gp_id,
950 tg_pt_gp->tg_pt_gp_alua_pending_state,
951 tg_pt_gp->tg_pt_gp_alua_access_status);
952
953 snprintf(path, ALUA_METADATA_PATH_LEN,
954 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
955 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
956
957 rc = core_alua_write_tpg_metadata(path, md_buf, len);
958 kfree(md_buf);
959 return rc;
960 }
961
962 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
963 {
964 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
965 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
966 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
967 struct se_dev_entry *se_deve;
968 struct se_lun_acl *lacl;
969 struct se_port *port;
970 struct t10_alua_tg_pt_gp_member *mem;
971 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
972 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
973
974 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
975 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
976 tg_pt_gp_mem_list) {
977 port = mem->tg_pt;
978 /*
979 * After an implicit target port asymmetric access state
980 * change, a device server shall establish a unit attention
981 * condition for the initiator port associated with every I_T
982 * nexus with the additional sense code set to ASYMMETRIC
983 * ACCESS STATE CHANGED.
984 *
985 * After an explicit target port asymmetric access state
986 * change, a device server shall establish a unit attention
987 * condition with the additional sense code set to ASYMMETRIC
988 * ACCESS STATE CHANGED for the initiator port associated with
989 * every I_T nexus other than the I_T nexus on which the SET
990 * TARGET PORT GROUPS command
991 */
992 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
993 smp_mb__after_atomic_inc();
994 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
995
996 spin_lock_bh(&port->sep_alua_lock);
997 list_for_each_entry(se_deve, &port->sep_alua_list,
998 alua_port_list) {
999 lacl = se_deve->se_lun_acl;
1000 /*
1001 * se_deve->se_lun_acl pointer may be NULL for a
1002 * entry created without explicit Node+MappedLUN ACLs
1003 */
1004 if (!lacl)
1005 continue;
1006
1007 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1008 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1009 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1010 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1011 (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1012 (tg_pt_gp->tg_pt_gp_alua_port == port))
1013 continue;
1014
1015 core_scsi3_ua_allocate(lacl->se_lun_nacl,
1016 se_deve->mapped_lun, 0x2A,
1017 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1018 }
1019 spin_unlock_bh(&port->sep_alua_lock);
1020
1021 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1022 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
1023 smp_mb__after_atomic_dec();
1024 }
1025 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1026 /*
1027 * Update the ALUA metadata buf that has been allocated in
1028 * core_alua_do_port_transition(), this metadata will be written
1029 * to struct file.
1030 *
1031 * Note that there is the case where we do not want to update the
1032 * metadata when the saved metadata is being parsed in userspace
1033 * when setting the existing port access state and access status.
1034 *
1035 * Also note that the failure to write out the ALUA metadata to
1036 * struct file does NOT affect the actual ALUA transition.
1037 */
1038 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1039 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1040 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1041 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1042 }
1043 /*
1044 * Set the current primary ALUA access state to the requested new state
1045 */
1046 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1047 tg_pt_gp->tg_pt_gp_alua_pending_state);
1048
1049 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1050 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1051 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1052 tg_pt_gp->tg_pt_gp_id,
1053 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1054 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1055 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1056 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1057 smp_mb__after_atomic_dec();
1058 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1059
1060 if (tg_pt_gp->tg_pt_gp_transition_complete)
1061 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1062 }
1063
1064 static int core_alua_do_transition_tg_pt(
1065 struct t10_alua_tg_pt_gp *tg_pt_gp,
1066 int new_state,
1067 int explicit)
1068 {
1069 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1070 DECLARE_COMPLETION_ONSTACK(wait);
1071
1072 /* Nothing to be done here */
1073 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1074 return 0;
1075
1076 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1077 return -EAGAIN;
1078
1079 /*
1080 * Flush any pending transitions
1081 */
1082 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1083 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1084 ALUA_ACCESS_STATE_TRANSITION) {
1085 /* Just in case */
1086 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1087 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1088 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1089 wait_for_completion(&wait);
1090 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1091 return 0;
1092 }
1093
1094 /*
1095 * Save the old primary ALUA access state, and set the current state
1096 * to ALUA_ACCESS_STATE_TRANSITION.
1097 */
1098 tg_pt_gp->tg_pt_gp_alua_previous_state =
1099 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1100 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1101
1102 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1103 ALUA_ACCESS_STATE_TRANSITION);
1104 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1105 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1106 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1107
1108 /*
1109 * Check for the optional ALUA primary state transition delay
1110 */
1111 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1112 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1113
1114 /*
1115 * Take a reference for workqueue item
1116 */
1117 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1118 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1119 smp_mb__after_atomic_inc();
1120 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1121
1122 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1123 unsigned long transition_tmo;
1124
1125 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1126 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1127 &tg_pt_gp->tg_pt_gp_transition_work,
1128 transition_tmo);
1129 } else {
1130 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1131 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1132 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1133 wait_for_completion(&wait);
1134 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1135 }
1136
1137 return 0;
1138 }
1139
1140 int core_alua_do_port_transition(
1141 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1142 struct se_device *l_dev,
1143 struct se_port *l_port,
1144 struct se_node_acl *l_nacl,
1145 int new_state,
1146 int explicit)
1147 {
1148 struct se_device *dev;
1149 struct t10_alua_lu_gp *lu_gp;
1150 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1151 struct t10_alua_tg_pt_gp *tg_pt_gp;
1152 int primary, valid_states, rc = 0;
1153
1154 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1155 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1156 return -EINVAL;
1157
1158 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1159 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1160 lu_gp = local_lu_gp_mem->lu_gp;
1161 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1162 smp_mb__after_atomic_inc();
1163 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1164 /*
1165 * For storage objects that are members of the 'default_lu_gp',
1166 * we only do transition on the passed *l_tp_pt_gp, and not
1167 * on all of the matching target port groups IDs in default_lu_gp.
1168 */
1169 if (!lu_gp->lu_gp_id) {
1170 /*
1171 * core_alua_do_transition_tg_pt() will always return
1172 * success.
1173 */
1174 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1175 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1176 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1177 new_state, explicit);
1178 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1179 smp_mb__after_atomic_dec();
1180 return rc;
1181 }
1182 /*
1183 * For all other LU groups aside from 'default_lu_gp', walk all of
1184 * the associated storage objects looking for a matching target port
1185 * group ID from the local target port group.
1186 */
1187 spin_lock(&lu_gp->lu_gp_lock);
1188 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1189 lu_gp_mem_list) {
1190
1191 dev = lu_gp_mem->lu_gp_mem_dev;
1192 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
1193 smp_mb__after_atomic_inc();
1194 spin_unlock(&lu_gp->lu_gp_lock);
1195
1196 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1197 list_for_each_entry(tg_pt_gp,
1198 &dev->t10_alua.tg_pt_gps_list,
1199 tg_pt_gp_list) {
1200
1201 if (!tg_pt_gp->tg_pt_gp_valid_id)
1202 continue;
1203 /*
1204 * If the target behavior port asymmetric access state
1205 * is changed for any target port group accessible via
1206 * a logical unit within a LU group, the target port
1207 * behavior group asymmetric access states for the same
1208 * target port group accessible via other logical units
1209 * in that LU group will also change.
1210 */
1211 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1212 continue;
1213
1214 if (l_tg_pt_gp == tg_pt_gp) {
1215 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1216 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1217 } else {
1218 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1219 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1220 }
1221 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1222 smp_mb__after_atomic_inc();
1223 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1224 /*
1225 * core_alua_do_transition_tg_pt() will always return
1226 * success.
1227 */
1228 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1229 new_state, explicit);
1230
1231 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1232 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1233 smp_mb__after_atomic_dec();
1234 if (rc)
1235 break;
1236 }
1237 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1238
1239 spin_lock(&lu_gp->lu_gp_lock);
1240 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
1241 smp_mb__after_atomic_dec();
1242 }
1243 spin_unlock(&lu_gp->lu_gp_lock);
1244
1245 if (!rc) {
1246 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1247 " Group IDs: %hu %s transition to primary state: %s\n",
1248 config_item_name(&lu_gp->lu_gp_group.cg_item),
1249 l_tg_pt_gp->tg_pt_gp_id,
1250 (explicit) ? "explicit" : "implicit",
1251 core_alua_dump_state(new_state));
1252 }
1253
1254 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1255 smp_mb__after_atomic_dec();
1256 return rc;
1257 }
1258
1259 /*
1260 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1261 */
1262 static int core_alua_update_tpg_secondary_metadata(
1263 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1264 struct se_port *port)
1265 {
1266 unsigned char *md_buf;
1267 struct se_portal_group *se_tpg = port->sep_tpg;
1268 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1269 int len, rc;
1270
1271 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1272 if (!md_buf) {
1273 pr_err("Unable to allocate buf for ALUA metadata\n");
1274 return -ENOMEM;
1275 }
1276
1277 memset(path, 0, ALUA_METADATA_PATH_LEN);
1278 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1279
1280 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1281 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1282
1283 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1284 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1285 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1286
1287 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1288 "alua_tg_pt_status=0x%02x\n",
1289 atomic_read(&port->sep_tg_pt_secondary_offline),
1290 port->sep_tg_pt_secondary_stat);
1291
1292 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1293 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1294 port->sep_lun->unpacked_lun);
1295
1296 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1297 kfree(md_buf);
1298
1299 return rc;
1300 }
1301
1302 static int core_alua_set_tg_pt_secondary_state(
1303 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1304 struct se_port *port,
1305 int explicit,
1306 int offline)
1307 {
1308 struct t10_alua_tg_pt_gp *tg_pt_gp;
1309 int trans_delay_msecs;
1310
1311 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1312 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1313 if (!tg_pt_gp) {
1314 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1315 pr_err("Unable to complete secondary state"
1316 " transition\n");
1317 return -EINVAL;
1318 }
1319 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1320 /*
1321 * Set the secondary ALUA target port access state to OFFLINE
1322 * or release the previously secondary state for struct se_port
1323 */
1324 if (offline)
1325 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1326 else
1327 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1328
1329 port->sep_tg_pt_secondary_stat = (explicit) ?
1330 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1331 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1332
1333 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1334 " to secondary access state: %s\n", (explicit) ? "explicit" :
1335 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1336 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1337
1338 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1339 /*
1340 * Do the optional transition delay after we set the secondary
1341 * ALUA access state.
1342 */
1343 if (trans_delay_msecs != 0)
1344 msleep_interruptible(trans_delay_msecs);
1345 /*
1346 * See if we need to update the ALUA fabric port metadata for
1347 * secondary state and status
1348 */
1349 if (port->sep_tg_pt_secondary_write_md) {
1350 mutex_lock(&port->sep_tg_pt_md_mutex);
1351 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1352 mutex_unlock(&port->sep_tg_pt_md_mutex);
1353 }
1354
1355 return 0;
1356 }
1357
1358 struct t10_alua_lba_map *
1359 core_alua_allocate_lba_map(struct list_head *list,
1360 u64 first_lba, u64 last_lba)
1361 {
1362 struct t10_alua_lba_map *lba_map;
1363
1364 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1365 if (!lba_map) {
1366 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1367 return ERR_PTR(-ENOMEM);
1368 }
1369 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1370 lba_map->lba_map_first_lba = first_lba;
1371 lba_map->lba_map_last_lba = last_lba;
1372
1373 list_add_tail(&lba_map->lba_map_list, list);
1374 return lba_map;
1375 }
1376
1377 int
1378 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1379 int pg_id, int state)
1380 {
1381 struct t10_alua_lba_map_member *lba_map_mem;
1382
1383 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1384 lba_map_mem_list) {
1385 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1386 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1387 return -EINVAL;
1388 }
1389 }
1390
1391 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1392 if (!lba_map_mem) {
1393 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1394 return -ENOMEM;
1395 }
1396 lba_map_mem->lba_map_mem_alua_state = state;
1397 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1398
1399 list_add_tail(&lba_map_mem->lba_map_mem_list,
1400 &lba_map->lba_map_mem_list);
1401 return 0;
1402 }
1403
1404 void
1405 core_alua_free_lba_map(struct list_head *lba_list)
1406 {
1407 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1408 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1409
1410 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1411 lba_map_list) {
1412 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1413 &lba_map->lba_map_mem_list,
1414 lba_map_mem_list) {
1415 list_del(&lba_map_mem->lba_map_mem_list);
1416 kmem_cache_free(t10_alua_lba_map_mem_cache,
1417 lba_map_mem);
1418 }
1419 list_del(&lba_map->lba_map_list);
1420 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1421 }
1422 }
1423
1424 void
1425 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1426 int segment_size, int segment_mult)
1427 {
1428 struct list_head old_lba_map_list;
1429 struct t10_alua_tg_pt_gp *tg_pt_gp;
1430 int activate = 0, supported;
1431
1432 INIT_LIST_HEAD(&old_lba_map_list);
1433 spin_lock(&dev->t10_alua.lba_map_lock);
1434 dev->t10_alua.lba_map_segment_size = segment_size;
1435 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1436 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1437 if (lba_map_list) {
1438 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1439 activate = 1;
1440 }
1441 spin_unlock(&dev->t10_alua.lba_map_lock);
1442 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1443 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1444 tg_pt_gp_list) {
1445
1446 if (!tg_pt_gp->tg_pt_gp_valid_id)
1447 continue;
1448 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1449 if (activate)
1450 supported |= ALUA_LBD_SUP;
1451 else
1452 supported &= ~ALUA_LBD_SUP;
1453 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1454 }
1455 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1456 core_alua_free_lba_map(&old_lba_map_list);
1457 }
1458
1459 struct t10_alua_lu_gp *
1460 core_alua_allocate_lu_gp(const char *name, int def_group)
1461 {
1462 struct t10_alua_lu_gp *lu_gp;
1463
1464 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1465 if (!lu_gp) {
1466 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1467 return ERR_PTR(-ENOMEM);
1468 }
1469 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1470 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1471 spin_lock_init(&lu_gp->lu_gp_lock);
1472 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1473
1474 if (def_group) {
1475 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1476 lu_gp->lu_gp_valid_id = 1;
1477 alua_lu_gps_count++;
1478 }
1479
1480 return lu_gp;
1481 }
1482
1483 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1484 {
1485 struct t10_alua_lu_gp *lu_gp_tmp;
1486 u16 lu_gp_id_tmp;
1487 /*
1488 * The lu_gp->lu_gp_id may only be set once..
1489 */
1490 if (lu_gp->lu_gp_valid_id) {
1491 pr_warn("ALUA LU Group already has a valid ID,"
1492 " ignoring request\n");
1493 return -EINVAL;
1494 }
1495
1496 spin_lock(&lu_gps_lock);
1497 if (alua_lu_gps_count == 0x0000ffff) {
1498 pr_err("Maximum ALUA alua_lu_gps_count:"
1499 " 0x0000ffff reached\n");
1500 spin_unlock(&lu_gps_lock);
1501 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1502 return -ENOSPC;
1503 }
1504 again:
1505 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1506 alua_lu_gps_counter++;
1507
1508 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1509 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1510 if (!lu_gp_id)
1511 goto again;
1512
1513 pr_warn("ALUA Logical Unit Group ID: %hu"
1514 " already exists, ignoring request\n",
1515 lu_gp_id);
1516 spin_unlock(&lu_gps_lock);
1517 return -EINVAL;
1518 }
1519 }
1520
1521 lu_gp->lu_gp_id = lu_gp_id_tmp;
1522 lu_gp->lu_gp_valid_id = 1;
1523 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1524 alua_lu_gps_count++;
1525 spin_unlock(&lu_gps_lock);
1526
1527 return 0;
1528 }
1529
1530 static struct t10_alua_lu_gp_member *
1531 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1532 {
1533 struct t10_alua_lu_gp_member *lu_gp_mem;
1534
1535 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1536 if (!lu_gp_mem) {
1537 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1538 return ERR_PTR(-ENOMEM);
1539 }
1540 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1541 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1542 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1543
1544 lu_gp_mem->lu_gp_mem_dev = dev;
1545 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1546
1547 return lu_gp_mem;
1548 }
1549
1550 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1551 {
1552 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1553 /*
1554 * Once we have reached this point, config_item_put() has
1555 * already been called from target_core_alua_drop_lu_gp().
1556 *
1557 * Here, we remove the *lu_gp from the global list so that
1558 * no associations can be made while we are releasing
1559 * struct t10_alua_lu_gp.
1560 */
1561 spin_lock(&lu_gps_lock);
1562 list_del(&lu_gp->lu_gp_node);
1563 alua_lu_gps_count--;
1564 spin_unlock(&lu_gps_lock);
1565 /*
1566 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1567 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1568 * released with core_alua_put_lu_gp_from_name()
1569 */
1570 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1571 cpu_relax();
1572 /*
1573 * Release reference to struct t10_alua_lu_gp * from all associated
1574 * struct se_device.
1575 */
1576 spin_lock(&lu_gp->lu_gp_lock);
1577 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1578 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1579 if (lu_gp_mem->lu_gp_assoc) {
1580 list_del(&lu_gp_mem->lu_gp_mem_list);
1581 lu_gp->lu_gp_members--;
1582 lu_gp_mem->lu_gp_assoc = 0;
1583 }
1584 spin_unlock(&lu_gp->lu_gp_lock);
1585 /*
1586 *
1587 * lu_gp_mem is associated with a single
1588 * struct se_device->dev_alua_lu_gp_mem, and is released when
1589 * struct se_device is released via core_alua_free_lu_gp_mem().
1590 *
1591 * If the passed lu_gp does NOT match the default_lu_gp, assume
1592 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1593 */
1594 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1595 if (lu_gp != default_lu_gp)
1596 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1597 default_lu_gp);
1598 else
1599 lu_gp_mem->lu_gp = NULL;
1600 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1601
1602 spin_lock(&lu_gp->lu_gp_lock);
1603 }
1604 spin_unlock(&lu_gp->lu_gp_lock);
1605
1606 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1607 }
1608
1609 void core_alua_free_lu_gp_mem(struct se_device *dev)
1610 {
1611 struct t10_alua_lu_gp *lu_gp;
1612 struct t10_alua_lu_gp_member *lu_gp_mem;
1613
1614 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1615 if (!lu_gp_mem)
1616 return;
1617
1618 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1619 cpu_relax();
1620
1621 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1622 lu_gp = lu_gp_mem->lu_gp;
1623 if (lu_gp) {
1624 spin_lock(&lu_gp->lu_gp_lock);
1625 if (lu_gp_mem->lu_gp_assoc) {
1626 list_del(&lu_gp_mem->lu_gp_mem_list);
1627 lu_gp->lu_gp_members--;
1628 lu_gp_mem->lu_gp_assoc = 0;
1629 }
1630 spin_unlock(&lu_gp->lu_gp_lock);
1631 lu_gp_mem->lu_gp = NULL;
1632 }
1633 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1634
1635 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1636 }
1637
1638 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1639 {
1640 struct t10_alua_lu_gp *lu_gp;
1641 struct config_item *ci;
1642
1643 spin_lock(&lu_gps_lock);
1644 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1645 if (!lu_gp->lu_gp_valid_id)
1646 continue;
1647 ci = &lu_gp->lu_gp_group.cg_item;
1648 if (!strcmp(config_item_name(ci), name)) {
1649 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1650 spin_unlock(&lu_gps_lock);
1651 return lu_gp;
1652 }
1653 }
1654 spin_unlock(&lu_gps_lock);
1655
1656 return NULL;
1657 }
1658
1659 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1660 {
1661 spin_lock(&lu_gps_lock);
1662 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1663 spin_unlock(&lu_gps_lock);
1664 }
1665
1666 /*
1667 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1668 */
1669 void __core_alua_attach_lu_gp_mem(
1670 struct t10_alua_lu_gp_member *lu_gp_mem,
1671 struct t10_alua_lu_gp *lu_gp)
1672 {
1673 spin_lock(&lu_gp->lu_gp_lock);
1674 lu_gp_mem->lu_gp = lu_gp;
1675 lu_gp_mem->lu_gp_assoc = 1;
1676 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1677 lu_gp->lu_gp_members++;
1678 spin_unlock(&lu_gp->lu_gp_lock);
1679 }
1680
1681 /*
1682 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1683 */
1684 void __core_alua_drop_lu_gp_mem(
1685 struct t10_alua_lu_gp_member *lu_gp_mem,
1686 struct t10_alua_lu_gp *lu_gp)
1687 {
1688 spin_lock(&lu_gp->lu_gp_lock);
1689 list_del(&lu_gp_mem->lu_gp_mem_list);
1690 lu_gp_mem->lu_gp = NULL;
1691 lu_gp_mem->lu_gp_assoc = 0;
1692 lu_gp->lu_gp_members--;
1693 spin_unlock(&lu_gp->lu_gp_lock);
1694 }
1695
1696 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1697 const char *name, int def_group)
1698 {
1699 struct t10_alua_tg_pt_gp *tg_pt_gp;
1700
1701 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1702 if (!tg_pt_gp) {
1703 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1704 return NULL;
1705 }
1706 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1707 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1708 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1709 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1710 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1711 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1712 core_alua_do_transition_tg_pt_work);
1713 tg_pt_gp->tg_pt_gp_dev = dev;
1714 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1715 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1716 /*
1717 * Enable both explicit and implicit ALUA support by default
1718 */
1719 tg_pt_gp->tg_pt_gp_alua_access_type =
1720 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1721 /*
1722 * Set the default Active/NonOptimized Delay in milliseconds
1723 */
1724 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1725 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1726 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1727
1728 /*
1729 * Enable all supported states
1730 */
1731 tg_pt_gp->tg_pt_gp_alua_supported_states =
1732 ALUA_T_SUP | ALUA_O_SUP |
1733 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1734
1735 if (def_group) {
1736 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1737 tg_pt_gp->tg_pt_gp_id =
1738 dev->t10_alua.alua_tg_pt_gps_counter++;
1739 tg_pt_gp->tg_pt_gp_valid_id = 1;
1740 dev->t10_alua.alua_tg_pt_gps_count++;
1741 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1742 &dev->t10_alua.tg_pt_gps_list);
1743 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1744 }
1745
1746 return tg_pt_gp;
1747 }
1748
1749 int core_alua_set_tg_pt_gp_id(
1750 struct t10_alua_tg_pt_gp *tg_pt_gp,
1751 u16 tg_pt_gp_id)
1752 {
1753 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1754 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1755 u16 tg_pt_gp_id_tmp;
1756
1757 /*
1758 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1759 */
1760 if (tg_pt_gp->tg_pt_gp_valid_id) {
1761 pr_warn("ALUA TG PT Group already has a valid ID,"
1762 " ignoring request\n");
1763 return -EINVAL;
1764 }
1765
1766 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1767 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1768 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1769 " 0x0000ffff reached\n");
1770 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1771 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1772 return -ENOSPC;
1773 }
1774 again:
1775 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1776 dev->t10_alua.alua_tg_pt_gps_counter++;
1777
1778 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1779 tg_pt_gp_list) {
1780 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1781 if (!tg_pt_gp_id)
1782 goto again;
1783
1784 pr_err("ALUA Target Port Group ID: %hu already"
1785 " exists, ignoring request\n", tg_pt_gp_id);
1786 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1787 return -EINVAL;
1788 }
1789 }
1790
1791 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1792 tg_pt_gp->tg_pt_gp_valid_id = 1;
1793 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1794 &dev->t10_alua.tg_pt_gps_list);
1795 dev->t10_alua.alua_tg_pt_gps_count++;
1796 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1797
1798 return 0;
1799 }
1800
1801 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1802 struct se_port *port)
1803 {
1804 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1805
1806 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1807 GFP_KERNEL);
1808 if (!tg_pt_gp_mem) {
1809 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1810 return ERR_PTR(-ENOMEM);
1811 }
1812 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1813 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1814 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1815
1816 tg_pt_gp_mem->tg_pt = port;
1817 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1818
1819 return tg_pt_gp_mem;
1820 }
1821
1822 void core_alua_free_tg_pt_gp(
1823 struct t10_alua_tg_pt_gp *tg_pt_gp)
1824 {
1825 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1826 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1827
1828 /*
1829 * Once we have reached this point, config_item_put() has already
1830 * been called from target_core_alua_drop_tg_pt_gp().
1831 *
1832 * Here we remove *tg_pt_gp from the global list so that
1833 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1834 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1835 */
1836 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1837 list_del(&tg_pt_gp->tg_pt_gp_list);
1838 dev->t10_alua.alua_tg_pt_gps_counter--;
1839 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1840
1841 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1842
1843 /*
1844 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1845 * core_alua_get_tg_pt_gp_by_name() in
1846 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1847 * to be released with core_alua_put_tg_pt_gp_from_name().
1848 */
1849 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1850 cpu_relax();
1851
1852 /*
1853 * Release reference to struct t10_alua_tg_pt_gp from all associated
1854 * struct se_port.
1855 */
1856 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1857 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1858 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1859 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1860 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1861 tg_pt_gp->tg_pt_gp_members--;
1862 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1863 }
1864 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1865 /*
1866 * tg_pt_gp_mem is associated with a single
1867 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1868 * core_alua_free_tg_pt_gp_mem().
1869 *
1870 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1871 * assume we want to re-associate a given tg_pt_gp_mem with
1872 * default_tg_pt_gp.
1873 */
1874 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1875 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1876 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1877 dev->t10_alua.default_tg_pt_gp);
1878 } else
1879 tg_pt_gp_mem->tg_pt_gp = NULL;
1880 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1881
1882 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1883 }
1884 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1885
1886 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1887 }
1888
1889 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1890 {
1891 struct t10_alua_tg_pt_gp *tg_pt_gp;
1892 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1893
1894 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1895 if (!tg_pt_gp_mem)
1896 return;
1897
1898 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1899 cpu_relax();
1900
1901 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1902 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1903 if (tg_pt_gp) {
1904 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1905 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1906 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1907 tg_pt_gp->tg_pt_gp_members--;
1908 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1909 }
1910 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1911 tg_pt_gp_mem->tg_pt_gp = NULL;
1912 }
1913 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1914
1915 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1916 }
1917
1918 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1919 struct se_device *dev, const char *name)
1920 {
1921 struct t10_alua_tg_pt_gp *tg_pt_gp;
1922 struct config_item *ci;
1923
1924 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1925 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1926 tg_pt_gp_list) {
1927 if (!tg_pt_gp->tg_pt_gp_valid_id)
1928 continue;
1929 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1930 if (!strcmp(config_item_name(ci), name)) {
1931 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1932 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1933 return tg_pt_gp;
1934 }
1935 }
1936 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1937
1938 return NULL;
1939 }
1940
1941 static void core_alua_put_tg_pt_gp_from_name(
1942 struct t10_alua_tg_pt_gp *tg_pt_gp)
1943 {
1944 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1945
1946 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1947 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1948 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1949 }
1950
1951 /*
1952 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1953 */
1954 void __core_alua_attach_tg_pt_gp_mem(
1955 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1956 struct t10_alua_tg_pt_gp *tg_pt_gp)
1957 {
1958 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1959 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1960 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1961 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1962 &tg_pt_gp->tg_pt_gp_mem_list);
1963 tg_pt_gp->tg_pt_gp_members++;
1964 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1965 }
1966
1967 /*
1968 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1969 */
1970 static void __core_alua_drop_tg_pt_gp_mem(
1971 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1972 struct t10_alua_tg_pt_gp *tg_pt_gp)
1973 {
1974 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1975 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1976 tg_pt_gp_mem->tg_pt_gp = NULL;
1977 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1978 tg_pt_gp->tg_pt_gp_members--;
1979 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1980 }
1981
1982 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1983 {
1984 struct config_item *tg_pt_ci;
1985 struct t10_alua_tg_pt_gp *tg_pt_gp;
1986 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1987 ssize_t len = 0;
1988
1989 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1990 if (!tg_pt_gp_mem)
1991 return len;
1992
1993 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1994 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1995 if (tg_pt_gp) {
1996 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1997 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1998 " %hu\nTG Port Primary Access State: %s\nTG Port "
1999 "Primary Access Status: %s\nTG Port Secondary Access"
2000 " State: %s\nTG Port Secondary Access Status: %s\n",
2001 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
2002 core_alua_dump_state(atomic_read(
2003 &tg_pt_gp->tg_pt_gp_alua_access_state)),
2004 core_alua_dump_status(
2005 tg_pt_gp->tg_pt_gp_alua_access_status),
2006 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2007 "Offline" : "None",
2008 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2009 }
2010 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2011
2012 return len;
2013 }
2014
2015 ssize_t core_alua_store_tg_pt_gp_info(
2016 struct se_port *port,
2017 const char *page,
2018 size_t count)
2019 {
2020 struct se_portal_group *tpg;
2021 struct se_lun *lun;
2022 struct se_device *dev = port->sep_lun->lun_se_dev;
2023 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2024 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2025 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2026 int move = 0;
2027
2028 tpg = port->sep_tpg;
2029 lun = port->sep_lun;
2030
2031 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2032 if (!tg_pt_gp_mem)
2033 return 0;
2034
2035 if (count > TG_PT_GROUP_NAME_BUF) {
2036 pr_err("ALUA Target Port Group alias too large!\n");
2037 return -EINVAL;
2038 }
2039 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2040 memcpy(buf, page, count);
2041 /*
2042 * Any ALUA target port group alias besides "NULL" means we will be
2043 * making a new group association.
2044 */
2045 if (strcmp(strstrip(buf), "NULL")) {
2046 /*
2047 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2048 * struct t10_alua_tg_pt_gp. This reference is released with
2049 * core_alua_put_tg_pt_gp_from_name() below.
2050 */
2051 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2052 strstrip(buf));
2053 if (!tg_pt_gp_new)
2054 return -ENODEV;
2055 }
2056
2057 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2058 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2059 if (tg_pt_gp) {
2060 /*
2061 * Clearing an existing tg_pt_gp association, and replacing
2062 * with the default_tg_pt_gp.
2063 */
2064 if (!tg_pt_gp_new) {
2065 pr_debug("Target_Core_ConfigFS: Moving"
2066 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2067 " alua/%s, ID: %hu back to"
2068 " default_tg_pt_gp\n",
2069 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2070 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2071 config_item_name(&lun->lun_group.cg_item),
2072 config_item_name(
2073 &tg_pt_gp->tg_pt_gp_group.cg_item),
2074 tg_pt_gp->tg_pt_gp_id);
2075
2076 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2077 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2078 dev->t10_alua.default_tg_pt_gp);
2079 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2080
2081 return count;
2082 }
2083 /*
2084 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2085 */
2086 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2087 move = 1;
2088 }
2089 /*
2090 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2091 */
2092 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2093 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2094 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2095 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2096 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2097 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2098 config_item_name(&lun->lun_group.cg_item),
2099 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2100 tg_pt_gp_new->tg_pt_gp_id);
2101
2102 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2103 return count;
2104 }
2105
2106 ssize_t core_alua_show_access_type(
2107 struct t10_alua_tg_pt_gp *tg_pt_gp,
2108 char *page)
2109 {
2110 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2111 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2112 return sprintf(page, "Implicit and Explicit\n");
2113 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2114 return sprintf(page, "Implicit\n");
2115 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2116 return sprintf(page, "Explicit\n");
2117 else
2118 return sprintf(page, "None\n");
2119 }
2120
2121 ssize_t core_alua_store_access_type(
2122 struct t10_alua_tg_pt_gp *tg_pt_gp,
2123 const char *page,
2124 size_t count)
2125 {
2126 unsigned long tmp;
2127 int ret;
2128
2129 ret = kstrtoul(page, 0, &tmp);
2130 if (ret < 0) {
2131 pr_err("Unable to extract alua_access_type\n");
2132 return ret;
2133 }
2134 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2135 pr_err("Illegal value for alua_access_type:"
2136 " %lu\n", tmp);
2137 return -EINVAL;
2138 }
2139 if (tmp == 3)
2140 tg_pt_gp->tg_pt_gp_alua_access_type =
2141 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2142 else if (tmp == 2)
2143 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2144 else if (tmp == 1)
2145 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2146 else
2147 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2148
2149 return count;
2150 }
2151
2152 ssize_t core_alua_show_nonop_delay_msecs(
2153 struct t10_alua_tg_pt_gp *tg_pt_gp,
2154 char *page)
2155 {
2156 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2157 }
2158
2159 ssize_t core_alua_store_nonop_delay_msecs(
2160 struct t10_alua_tg_pt_gp *tg_pt_gp,
2161 const char *page,
2162 size_t count)
2163 {
2164 unsigned long tmp;
2165 int ret;
2166
2167 ret = kstrtoul(page, 0, &tmp);
2168 if (ret < 0) {
2169 pr_err("Unable to extract nonop_delay_msecs\n");
2170 return ret;
2171 }
2172 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2173 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2174 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2175 ALUA_MAX_NONOP_DELAY_MSECS);
2176 return -EINVAL;
2177 }
2178 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2179
2180 return count;
2181 }
2182
2183 ssize_t core_alua_show_trans_delay_msecs(
2184 struct t10_alua_tg_pt_gp *tg_pt_gp,
2185 char *page)
2186 {
2187 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2188 }
2189
2190 ssize_t core_alua_store_trans_delay_msecs(
2191 struct t10_alua_tg_pt_gp *tg_pt_gp,
2192 const char *page,
2193 size_t count)
2194 {
2195 unsigned long tmp;
2196 int ret;
2197
2198 ret = kstrtoul(page, 0, &tmp);
2199 if (ret < 0) {
2200 pr_err("Unable to extract trans_delay_msecs\n");
2201 return ret;
2202 }
2203 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2204 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2205 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2206 ALUA_MAX_TRANS_DELAY_MSECS);
2207 return -EINVAL;
2208 }
2209 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2210
2211 return count;
2212 }
2213
2214 ssize_t core_alua_show_implicit_trans_secs(
2215 struct t10_alua_tg_pt_gp *tg_pt_gp,
2216 char *page)
2217 {
2218 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2219 }
2220
2221 ssize_t core_alua_store_implicit_trans_secs(
2222 struct t10_alua_tg_pt_gp *tg_pt_gp,
2223 const char *page,
2224 size_t count)
2225 {
2226 unsigned long tmp;
2227 int ret;
2228
2229 ret = kstrtoul(page, 0, &tmp);
2230 if (ret < 0) {
2231 pr_err("Unable to extract implicit_trans_secs\n");
2232 return ret;
2233 }
2234 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2235 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2236 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2237 ALUA_MAX_IMPLICIT_TRANS_SECS);
2238 return -EINVAL;
2239 }
2240 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2241
2242 return count;
2243 }
2244
2245 ssize_t core_alua_show_preferred_bit(
2246 struct t10_alua_tg_pt_gp *tg_pt_gp,
2247 char *page)
2248 {
2249 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2250 }
2251
2252 ssize_t core_alua_store_preferred_bit(
2253 struct t10_alua_tg_pt_gp *tg_pt_gp,
2254 const char *page,
2255 size_t count)
2256 {
2257 unsigned long tmp;
2258 int ret;
2259
2260 ret = kstrtoul(page, 0, &tmp);
2261 if (ret < 0) {
2262 pr_err("Unable to extract preferred ALUA value\n");
2263 return ret;
2264 }
2265 if ((tmp != 0) && (tmp != 1)) {
2266 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2267 return -EINVAL;
2268 }
2269 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2270
2271 return count;
2272 }
2273
2274 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2275 {
2276 if (!lun->lun_sep)
2277 return -ENODEV;
2278
2279 return sprintf(page, "%d\n",
2280 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2281 }
2282
2283 ssize_t core_alua_store_offline_bit(
2284 struct se_lun *lun,
2285 const char *page,
2286 size_t count)
2287 {
2288 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2289 unsigned long tmp;
2290 int ret;
2291
2292 if (!lun->lun_sep)
2293 return -ENODEV;
2294
2295 ret = kstrtoul(page, 0, &tmp);
2296 if (ret < 0) {
2297 pr_err("Unable to extract alua_tg_pt_offline value\n");
2298 return ret;
2299 }
2300 if ((tmp != 0) && (tmp != 1)) {
2301 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2302 tmp);
2303 return -EINVAL;
2304 }
2305 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2306 if (!tg_pt_gp_mem) {
2307 pr_err("Unable to locate *tg_pt_gp_mem\n");
2308 return -EINVAL;
2309 }
2310
2311 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2312 lun->lun_sep, 0, (int)tmp);
2313 if (ret < 0)
2314 return -EINVAL;
2315
2316 return count;
2317 }
2318
2319 ssize_t core_alua_show_secondary_status(
2320 struct se_lun *lun,
2321 char *page)
2322 {
2323 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2324 }
2325
2326 ssize_t core_alua_store_secondary_status(
2327 struct se_lun *lun,
2328 const char *page,
2329 size_t count)
2330 {
2331 unsigned long tmp;
2332 int ret;
2333
2334 ret = kstrtoul(page, 0, &tmp);
2335 if (ret < 0) {
2336 pr_err("Unable to extract alua_tg_pt_status\n");
2337 return ret;
2338 }
2339 if ((tmp != ALUA_STATUS_NONE) &&
2340 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2341 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2342 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2343 tmp);
2344 return -EINVAL;
2345 }
2346 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2347
2348 return count;
2349 }
2350
2351 ssize_t core_alua_show_secondary_write_metadata(
2352 struct se_lun *lun,
2353 char *page)
2354 {
2355 return sprintf(page, "%d\n",
2356 lun->lun_sep->sep_tg_pt_secondary_write_md);
2357 }
2358
2359 ssize_t core_alua_store_secondary_write_metadata(
2360 struct se_lun *lun,
2361 const char *page,
2362 size_t count)
2363 {
2364 unsigned long tmp;
2365 int ret;
2366
2367 ret = kstrtoul(page, 0, &tmp);
2368 if (ret < 0) {
2369 pr_err("Unable to extract alua_tg_pt_write_md\n");
2370 return ret;
2371 }
2372 if ((tmp != 0) && (tmp != 1)) {
2373 pr_err("Illegal value for alua_tg_pt_write_md:"
2374 " %lu\n", tmp);
2375 return -EINVAL;
2376 }
2377 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2378
2379 return count;
2380 }
2381
2382 int core_setup_alua(struct se_device *dev)
2383 {
2384 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2385 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2386 struct t10_alua_lu_gp_member *lu_gp_mem;
2387
2388 /*
2389 * Associate this struct se_device with the default ALUA
2390 * LUN Group.
2391 */
2392 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2393 if (IS_ERR(lu_gp_mem))
2394 return PTR_ERR(lu_gp_mem);
2395
2396 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2397 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2398 default_lu_gp);
2399 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2400
2401 pr_debug("%s: Adding to default ALUA LU Group:"
2402 " core/alua/lu_gps/default_lu_gp\n",
2403 dev->transport->name);
2404 }
2405
2406 return 0;
2407 }
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