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_proto.h>
32 #include <asm/unaligned.h>
33
34 #include <target/target_core_base.h>
35 #include <target/target_core_backend.h>
36 #include <target/target_core_fabric.h>
37
38 #include "target_core_internal.h"
39 #include "target_core_alua.h"
40 #include "target_core_ua.h"
41
42 static sense_reason_t core_alua_check_transition(int state, int valid,
43 int *primary);
44 static int core_alua_set_tg_pt_secondary_state(
45 struct se_lun *lun, int explicit, int offline);
46
47 static char *core_alua_dump_state(int state);
48
49 static void __target_attach_tg_pt_gp(struct se_lun *lun,
50 struct t10_alua_tg_pt_gp *tg_pt_gp);
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
target_emulate_report_referrals(struct se_cmd * cmd)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
target_emulate_report_target_port_groups(struct se_cmd * cmd)146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 {
148 struct se_device *dev = cmd->se_dev;
149 struct t10_alua_tg_pt_gp *tg_pt_gp;
150 struct se_lun *lun;
151 unsigned char *buf;
152 u32 rd_len = 0, off;
153 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
154
155 /*
156 * Skip over RESERVED area to first Target port group descriptor
157 * depending on the PARAMETER DATA FORMAT type..
158 */
159 if (ext_hdr != 0)
160 off = 8;
161 else
162 off = 4;
163
164 if (cmd->data_length < off) {
165 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
166 " small for %s header\n", cmd->data_length,
167 (ext_hdr) ? "extended" : "normal");
168 return TCM_INVALID_CDB_FIELD;
169 }
170 buf = transport_kmap_data_sg(cmd);
171 if (!buf)
172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
173
174 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
175 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
176 tg_pt_gp_list) {
177 /*
178 * Check if the Target port group and Target port descriptor list
179 * based on tg_pt_gp_members count will fit into the response payload.
180 * Otherwise, bump rd_len to let the initiator know we have exceeded
181 * the allocation length and the response is truncated.
182 */
183 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
184 cmd->data_length) {
185 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
186 continue;
187 }
188 /*
189 * PREF: Preferred target port bit, determine if this
190 * bit should be set for port group.
191 */
192 if (tg_pt_gp->tg_pt_gp_pref)
193 buf[off] = 0x80;
194 /*
195 * Set the ASYMMETRIC ACCESS State
196 */
197 buf[off++] |= (atomic_read(
198 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
199 /*
200 * Set supported ASYMMETRIC ACCESS State bits
201 */
202 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
203 /*
204 * TARGET PORT GROUP
205 */
206 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
207 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
208
209 off++; /* Skip over Reserved */
210 /*
211 * STATUS CODE
212 */
213 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
214 /*
215 * Vendor Specific field
216 */
217 buf[off++] = 0x00;
218 /*
219 * TARGET PORT COUNT
220 */
221 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
222 rd_len += 8;
223
224 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
225 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
226 lun_tg_pt_gp_link) {
227 /*
228 * Start Target Port descriptor format
229 *
230 * See spc4r17 section 6.2.7 Table 247
231 */
232 off += 2; /* Skip over Obsolete */
233 /*
234 * Set RELATIVE TARGET PORT IDENTIFIER
235 */
236 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
237 buf[off++] = (lun->lun_rtpi & 0xff);
238 rd_len += 4;
239 }
240 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
241 }
242 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
243 /*
244 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
245 */
246 put_unaligned_be32(rd_len, &buf[0]);
247
248 /*
249 * Fill in the Extended header parameter data format if requested
250 */
251 if (ext_hdr != 0) {
252 buf[4] = 0x10;
253 /*
254 * Set the implicit transition time (in seconds) for the application
255 * client to use as a base for it's transition timeout value.
256 *
257 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
258 * this CDB was received upon to determine this value individually
259 * for ALUA target port group.
260 */
261 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
262 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
263 if (tg_pt_gp)
264 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
265 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
266 }
267 transport_kunmap_data_sg(cmd);
268
269 target_complete_cmd(cmd, GOOD);
270 return 0;
271 }
272
273 /*
274 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
275 *
276 * See spc4r17 section 6.35
277 */
278 sense_reason_t
target_emulate_set_target_port_groups(struct se_cmd * cmd)279 target_emulate_set_target_port_groups(struct se_cmd *cmd)
280 {
281 struct se_device *dev = cmd->se_dev;
282 struct se_lun *l_lun = cmd->se_lun;
283 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
284 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
285 unsigned char *buf;
286 unsigned char *ptr;
287 sense_reason_t rc = TCM_NO_SENSE;
288 u32 len = 4; /* Skip over RESERVED area in header */
289 int alua_access_state, primary = 0, valid_states;
290 u16 tg_pt_id, rtpi;
291
292 if (cmd->data_length < 4) {
293 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
294 " small\n", cmd->data_length);
295 return TCM_INVALID_PARAMETER_LIST;
296 }
297
298 buf = transport_kmap_data_sg(cmd);
299 if (!buf)
300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
301
302 /*
303 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
304 * for the local tg_pt_gp.
305 */
306 spin_lock(&l_lun->lun_tg_pt_gp_lock);
307 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
308 if (!l_tg_pt_gp) {
309 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
310 pr_err("Unable to access l_lun->tg_pt_gp\n");
311 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
312 goto out;
313 }
314
315 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
316 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
317 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
318 " while TPGS_EXPLICIT_ALUA is disabled\n");
319 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
320 goto out;
321 }
322 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
323 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
324
325 ptr = &buf[4]; /* Skip over RESERVED area in header */
326
327 while (len < cmd->data_length) {
328 bool found = false;
329 alua_access_state = (ptr[0] & 0x0f);
330 /*
331 * Check the received ALUA access state, and determine if
332 * the state is a primary or secondary target port asymmetric
333 * access state.
334 */
335 rc = core_alua_check_transition(alua_access_state,
336 valid_states, &primary);
337 if (rc) {
338 /*
339 * If the SET TARGET PORT GROUPS attempts to establish
340 * an invalid combination of target port asymmetric
341 * access states or attempts to establish an
342 * unsupported target port asymmetric access state,
343 * then the command shall be terminated with CHECK
344 * CONDITION status, with the sense key set to ILLEGAL
345 * REQUEST, and the additional sense code set to INVALID
346 * FIELD IN PARAMETER LIST.
347 */
348 goto out;
349 }
350
351 /*
352 * If the ASYMMETRIC ACCESS STATE field (see table 267)
353 * specifies a primary target port asymmetric access state,
354 * then the TARGET PORT GROUP OR TARGET PORT field specifies
355 * a primary target port group for which the primary target
356 * port asymmetric access state shall be changed. If the
357 * ASYMMETRIC ACCESS STATE field specifies a secondary target
358 * port asymmetric access state, then the TARGET PORT GROUP OR
359 * TARGET PORT field specifies the relative target port
360 * identifier (see 3.1.120) of the target port for which the
361 * secondary target port asymmetric access state shall be
362 * changed.
363 */
364 if (primary) {
365 tg_pt_id = get_unaligned_be16(ptr + 2);
366 /*
367 * Locate the matching target port group ID from
368 * the global tg_pt_gp list
369 */
370 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
371 list_for_each_entry(tg_pt_gp,
372 &dev->t10_alua.tg_pt_gps_list,
373 tg_pt_gp_list) {
374 if (!tg_pt_gp->tg_pt_gp_valid_id)
375 continue;
376
377 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
378 continue;
379
380 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
381
382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
383
384 if (!core_alua_do_port_transition(tg_pt_gp,
385 dev, l_lun, nacl,
386 alua_access_state, 1))
387 found = true;
388
389 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
390 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
391 break;
392 }
393 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
394 } else {
395 struct se_lun *lun;
396
397 /*
398 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
399 * the Target Port in question for the the incoming
400 * SET_TARGET_PORT_GROUPS op.
401 */
402 rtpi = get_unaligned_be16(ptr + 2);
403 /*
404 * Locate the matching relative target port identifier
405 * for the struct se_device storage object.
406 */
407 spin_lock(&dev->se_port_lock);
408 list_for_each_entry(lun, &dev->dev_sep_list,
409 lun_dev_link) {
410 if (lun->lun_rtpi != rtpi)
411 continue;
412
413 // XXX: racy unlock
414 spin_unlock(&dev->se_port_lock);
415
416 if (!core_alua_set_tg_pt_secondary_state(
417 lun, 1, 1))
418 found = true;
419
420 spin_lock(&dev->se_port_lock);
421 break;
422 }
423 spin_unlock(&dev->se_port_lock);
424 }
425
426 if (!found) {
427 rc = TCM_INVALID_PARAMETER_LIST;
428 goto out;
429 }
430
431 ptr += 4;
432 len += 4;
433 }
434
435 out:
436 transport_kunmap_data_sg(cmd);
437 if (!rc)
438 target_complete_cmd(cmd, GOOD);
439 return rc;
440 }
441
set_ascq(struct se_cmd * cmd,u8 alua_ascq)442 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
443 {
444 /*
445 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
446 * The ALUA additional sense code qualifier (ASCQ) is determined
447 * by the ALUA primary or secondary access state..
448 */
449 pr_debug("[%s]: ALUA TG Port not available, "
450 "SenseKey: NOT_READY, ASC/ASCQ: "
451 "0x04/0x%02x\n",
452 cmd->se_tfo->get_fabric_name(), alua_ascq);
453
454 cmd->scsi_asc = 0x04;
455 cmd->scsi_ascq = alua_ascq;
456 }
457
core_alua_state_nonoptimized(struct se_cmd * cmd,unsigned char * cdb,int nonop_delay_msecs)458 static inline void core_alua_state_nonoptimized(
459 struct se_cmd *cmd,
460 unsigned char *cdb,
461 int nonop_delay_msecs)
462 {
463 /*
464 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
465 * later to determine if processing of this cmd needs to be
466 * temporarily delayed for the Active/NonOptimized primary access state.
467 */
468 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
469 cmd->alua_nonop_delay = nonop_delay_msecs;
470 }
471
core_alua_state_lba_dependent(struct se_cmd * cmd,struct t10_alua_tg_pt_gp * tg_pt_gp)472 static inline int core_alua_state_lba_dependent(
473 struct se_cmd *cmd,
474 struct t10_alua_tg_pt_gp *tg_pt_gp)
475 {
476 struct se_device *dev = cmd->se_dev;
477 u64 segment_size, segment_mult, sectors, lba;
478
479 /* Only need to check for cdb actually containing LBAs */
480 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
481 return 0;
482
483 spin_lock(&dev->t10_alua.lba_map_lock);
484 segment_size = dev->t10_alua.lba_map_segment_size;
485 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
486 sectors = cmd->data_length / dev->dev_attrib.block_size;
487
488 lba = cmd->t_task_lba;
489 while (lba < cmd->t_task_lba + sectors) {
490 struct t10_alua_lba_map *cur_map = NULL, *map;
491 struct t10_alua_lba_map_member *map_mem;
492
493 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
494 lba_map_list) {
495 u64 start_lba, last_lba;
496 u64 first_lba = map->lba_map_first_lba;
497
498 if (segment_mult) {
499 u64 tmp = lba;
500 start_lba = do_div(tmp, segment_size * segment_mult);
501
502 last_lba = first_lba + segment_size - 1;
503 if (start_lba >= first_lba &&
504 start_lba <= last_lba) {
505 lba += segment_size;
506 cur_map = map;
507 break;
508 }
509 } else {
510 last_lba = map->lba_map_last_lba;
511 if (lba >= first_lba && lba <= last_lba) {
512 lba = last_lba + 1;
513 cur_map = map;
514 break;
515 }
516 }
517 }
518 if (!cur_map) {
519 spin_unlock(&dev->t10_alua.lba_map_lock);
520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
521 return 1;
522 }
523 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
524 lba_map_mem_list) {
525 if (map_mem->lba_map_mem_alua_pg_id !=
526 tg_pt_gp->tg_pt_gp_id)
527 continue;
528 switch(map_mem->lba_map_mem_alua_state) {
529 case ALUA_ACCESS_STATE_STANDBY:
530 spin_unlock(&dev->t10_alua.lba_map_lock);
531 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
532 return 1;
533 case ALUA_ACCESS_STATE_UNAVAILABLE:
534 spin_unlock(&dev->t10_alua.lba_map_lock);
535 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
536 return 1;
537 default:
538 break;
539 }
540 }
541 }
542 spin_unlock(&dev->t10_alua.lba_map_lock);
543 return 0;
544 }
545
core_alua_state_standby(struct se_cmd * cmd,unsigned char * cdb)546 static inline int core_alua_state_standby(
547 struct se_cmd *cmd,
548 unsigned char *cdb)
549 {
550 /*
551 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
552 * spc4r17 section 5.9.2.4.4
553 */
554 switch (cdb[0]) {
555 case INQUIRY:
556 case LOG_SELECT:
557 case LOG_SENSE:
558 case MODE_SELECT:
559 case MODE_SENSE:
560 case REPORT_LUNS:
561 case RECEIVE_DIAGNOSTIC:
562 case SEND_DIAGNOSTIC:
563 case READ_CAPACITY:
564 return 0;
565 case SERVICE_ACTION_IN_16:
566 switch (cdb[1] & 0x1f) {
567 case SAI_READ_CAPACITY_16:
568 return 0;
569 default:
570 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
571 return 1;
572 }
573 case MAINTENANCE_IN:
574 switch (cdb[1] & 0x1f) {
575 case MI_REPORT_TARGET_PGS:
576 return 0;
577 default:
578 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
579 return 1;
580 }
581 case MAINTENANCE_OUT:
582 switch (cdb[1]) {
583 case MO_SET_TARGET_PGS:
584 return 0;
585 default:
586 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
587 return 1;
588 }
589 case REQUEST_SENSE:
590 case PERSISTENT_RESERVE_IN:
591 case PERSISTENT_RESERVE_OUT:
592 case READ_BUFFER:
593 case WRITE_BUFFER:
594 return 0;
595 default:
596 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
597 return 1;
598 }
599
600 return 0;
601 }
602
core_alua_state_unavailable(struct se_cmd * cmd,unsigned char * cdb)603 static inline int core_alua_state_unavailable(
604 struct se_cmd *cmd,
605 unsigned char *cdb)
606 {
607 /*
608 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
609 * spc4r17 section 5.9.2.4.5
610 */
611 switch (cdb[0]) {
612 case INQUIRY:
613 case REPORT_LUNS:
614 return 0;
615 case MAINTENANCE_IN:
616 switch (cdb[1] & 0x1f) {
617 case MI_REPORT_TARGET_PGS:
618 return 0;
619 default:
620 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
621 return 1;
622 }
623 case MAINTENANCE_OUT:
624 switch (cdb[1]) {
625 case MO_SET_TARGET_PGS:
626 return 0;
627 default:
628 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
629 return 1;
630 }
631 case REQUEST_SENSE:
632 case READ_BUFFER:
633 case WRITE_BUFFER:
634 return 0;
635 default:
636 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
637 return 1;
638 }
639
640 return 0;
641 }
642
core_alua_state_transition(struct se_cmd * cmd,unsigned char * cdb)643 static inline int core_alua_state_transition(
644 struct se_cmd *cmd,
645 unsigned char *cdb)
646 {
647 /*
648 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
649 * spc4r17 section 5.9.2.5
650 */
651 switch (cdb[0]) {
652 case INQUIRY:
653 case REPORT_LUNS:
654 return 0;
655 case MAINTENANCE_IN:
656 switch (cdb[1] & 0x1f) {
657 case MI_REPORT_TARGET_PGS:
658 return 0;
659 default:
660 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
661 return 1;
662 }
663 case REQUEST_SENSE:
664 case READ_BUFFER:
665 case WRITE_BUFFER:
666 return 0;
667 default:
668 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
669 return 1;
670 }
671
672 return 0;
673 }
674
675 /*
676 * return 1: Is used to signal LUN not accessible, and check condition/not ready
677 * return 0: Used to signal success
678 * return -1: Used to signal failure, and invalid cdb field
679 */
680 sense_reason_t
target_alua_state_check(struct se_cmd * cmd)681 target_alua_state_check(struct se_cmd *cmd)
682 {
683 struct se_device *dev = cmd->se_dev;
684 unsigned char *cdb = cmd->t_task_cdb;
685 struct se_lun *lun = cmd->se_lun;
686 struct t10_alua_tg_pt_gp *tg_pt_gp;
687 int out_alua_state, nonop_delay_msecs;
688
689 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
690 return 0;
691 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
692 return 0;
693
694 /*
695 * First, check for a struct se_port specific secondary ALUA target port
696 * access state: OFFLINE
697 */
698 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
699 pr_debug("ALUA: Got secondary offline status for local"
700 " target port\n");
701 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
702 return TCM_CHECK_CONDITION_NOT_READY;
703 }
704
705 if (!lun->lun_tg_pt_gp)
706 return 0;
707
708 spin_lock(&lun->lun_tg_pt_gp_lock);
709 tg_pt_gp = lun->lun_tg_pt_gp;
710 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
711 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
712
713 // XXX: keeps using tg_pt_gp witout reference after unlock
714 spin_unlock(&lun->lun_tg_pt_gp_lock);
715 /*
716 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
717 * statement so the compiler knows explicitly to check this case first.
718 * For the Optimized ALUA access state case, we want to process the
719 * incoming fabric cmd ASAP..
720 */
721 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
722 return 0;
723
724 switch (out_alua_state) {
725 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
726 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
727 break;
728 case ALUA_ACCESS_STATE_STANDBY:
729 if (core_alua_state_standby(cmd, cdb))
730 return TCM_CHECK_CONDITION_NOT_READY;
731 break;
732 case ALUA_ACCESS_STATE_UNAVAILABLE:
733 if (core_alua_state_unavailable(cmd, cdb))
734 return TCM_CHECK_CONDITION_NOT_READY;
735 break;
736 case ALUA_ACCESS_STATE_TRANSITION:
737 if (core_alua_state_transition(cmd, cdb))
738 return TCM_CHECK_CONDITION_NOT_READY;
739 break;
740 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
741 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
742 return TCM_CHECK_CONDITION_NOT_READY;
743 break;
744 /*
745 * OFFLINE is a secondary ALUA target port group access state, that is
746 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
747 */
748 case ALUA_ACCESS_STATE_OFFLINE:
749 default:
750 pr_err("Unknown ALUA access state: 0x%02x\n",
751 out_alua_state);
752 return TCM_INVALID_CDB_FIELD;
753 }
754
755 return 0;
756 }
757
758 /*
759 * Check implicit and explicit ALUA state change request.
760 */
761 static sense_reason_t
core_alua_check_transition(int state,int valid,int * primary)762 core_alua_check_transition(int state, int valid, int *primary)
763 {
764 /*
765 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
766 * defined as primary target port asymmetric access states.
767 */
768 switch (state) {
769 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
770 if (!(valid & ALUA_AO_SUP))
771 goto not_supported;
772 *primary = 1;
773 break;
774 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
775 if (!(valid & ALUA_AN_SUP))
776 goto not_supported;
777 *primary = 1;
778 break;
779 case ALUA_ACCESS_STATE_STANDBY:
780 if (!(valid & ALUA_S_SUP))
781 goto not_supported;
782 *primary = 1;
783 break;
784 case ALUA_ACCESS_STATE_UNAVAILABLE:
785 if (!(valid & ALUA_U_SUP))
786 goto not_supported;
787 *primary = 1;
788 break;
789 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
790 if (!(valid & ALUA_LBD_SUP))
791 goto not_supported;
792 *primary = 1;
793 break;
794 case ALUA_ACCESS_STATE_OFFLINE:
795 /*
796 * OFFLINE state is defined as a secondary target port
797 * asymmetric access state.
798 */
799 if (!(valid & ALUA_O_SUP))
800 goto not_supported;
801 *primary = 0;
802 break;
803 case ALUA_ACCESS_STATE_TRANSITION:
804 /*
805 * Transitioning is set internally, and
806 * cannot be selected manually.
807 */
808 goto not_supported;
809 default:
810 pr_err("Unknown ALUA access state: 0x%02x\n", state);
811 return TCM_INVALID_PARAMETER_LIST;
812 }
813
814 return 0;
815
816 not_supported:
817 pr_err("ALUA access state %s not supported",
818 core_alua_dump_state(state));
819 return TCM_INVALID_PARAMETER_LIST;
820 }
821
core_alua_dump_state(int state)822 static char *core_alua_dump_state(int state)
823 {
824 switch (state) {
825 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
826 return "Active/Optimized";
827 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
828 return "Active/NonOptimized";
829 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
830 return "LBA Dependent";
831 case ALUA_ACCESS_STATE_STANDBY:
832 return "Standby";
833 case ALUA_ACCESS_STATE_UNAVAILABLE:
834 return "Unavailable";
835 case ALUA_ACCESS_STATE_OFFLINE:
836 return "Offline";
837 case ALUA_ACCESS_STATE_TRANSITION:
838 return "Transitioning";
839 default:
840 return "Unknown";
841 }
842
843 return NULL;
844 }
845
core_alua_dump_status(int status)846 char *core_alua_dump_status(int status)
847 {
848 switch (status) {
849 case ALUA_STATUS_NONE:
850 return "None";
851 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
852 return "Altered by Explicit STPG";
853 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
854 return "Altered by Implicit ALUA";
855 default:
856 return "Unknown";
857 }
858
859 return NULL;
860 }
861
862 /*
863 * Used by fabric modules to determine when we need to delay processing
864 * for the Active/NonOptimized paths..
865 */
core_alua_check_nonop_delay(struct se_cmd * cmd)866 int core_alua_check_nonop_delay(
867 struct se_cmd *cmd)
868 {
869 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
870 return 0;
871 if (in_interrupt())
872 return 0;
873 /*
874 * The ALUA Active/NonOptimized access state delay can be disabled
875 * in via configfs with a value of zero
876 */
877 if (!cmd->alua_nonop_delay)
878 return 0;
879 /*
880 * struct se_cmd->alua_nonop_delay gets set by a target port group
881 * defined interval in core_alua_state_nonoptimized()
882 */
883 msleep_interruptible(cmd->alua_nonop_delay);
884 return 0;
885 }
886 EXPORT_SYMBOL(core_alua_check_nonop_delay);
887
core_alua_write_tpg_metadata(const char * path,unsigned char * md_buf,u32 md_buf_len)888 static int core_alua_write_tpg_metadata(
889 const char *path,
890 unsigned char *md_buf,
891 u32 md_buf_len)
892 {
893 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
894 int ret;
895
896 if (IS_ERR(file)) {
897 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
898 return -ENODEV;
899 }
900 ret = kernel_write(file, md_buf, md_buf_len, 0);
901 if (ret < 0)
902 pr_err("Error writing ALUA metadata file: %s\n", path);
903 fput(file);
904 return (ret < 0) ? -EIO : 0;
905 }
906
907 /*
908 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
909 */
core_alua_update_tpg_primary_metadata(struct t10_alua_tg_pt_gp * tg_pt_gp)910 static int core_alua_update_tpg_primary_metadata(
911 struct t10_alua_tg_pt_gp *tg_pt_gp)
912 {
913 unsigned char *md_buf;
914 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
915 char path[ALUA_METADATA_PATH_LEN];
916 int len, rc;
917
918 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
919 if (!md_buf) {
920 pr_err("Unable to allocate buf for ALUA metadata\n");
921 return -ENOMEM;
922 }
923
924 memset(path, 0, ALUA_METADATA_PATH_LEN);
925
926 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
927 "tg_pt_gp_id=%hu\n"
928 "alua_access_state=0x%02x\n"
929 "alua_access_status=0x%02x\n",
930 tg_pt_gp->tg_pt_gp_id,
931 tg_pt_gp->tg_pt_gp_alua_pending_state,
932 tg_pt_gp->tg_pt_gp_alua_access_status);
933
934 snprintf(path, ALUA_METADATA_PATH_LEN,
935 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
936 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
937
938 rc = core_alua_write_tpg_metadata(path, md_buf, len);
939 kfree(md_buf);
940 return rc;
941 }
942
core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp * tg_pt_gp)943 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
944 {
945 struct se_dev_entry *se_deve;
946 struct se_lun *lun;
947 struct se_lun_acl *lacl;
948
949 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
950 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
951 lun_tg_pt_gp_link) {
952 /*
953 * After an implicit target port asymmetric access state
954 * change, a device server shall establish a unit attention
955 * condition for the initiator port associated with every I_T
956 * nexus with the additional sense code set to ASYMMETRIC
957 * ACCESS STATE CHANGED.
958 *
959 * After an explicit target port asymmetric access state
960 * change, a device server shall establish a unit attention
961 * condition with the additional sense code set to ASYMMETRIC
962 * ACCESS STATE CHANGED for the initiator port associated with
963 * every I_T nexus other than the I_T nexus on which the SET
964 * TARGET PORT GROUPS command
965 */
966 if (!percpu_ref_tryget_live(&lun->lun_ref))
967 continue;
968 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
969
970 spin_lock(&lun->lun_deve_lock);
971 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
972 lacl = rcu_dereference_check(se_deve->se_lun_acl,
973 lockdep_is_held(&lun->lun_deve_lock));
974
975 /*
976 * spc4r37 p.242:
977 * After an explicit target port asymmetric access
978 * state change, a device server shall establish a
979 * unit attention condition with the additional sense
980 * code set to ASYMMETRIC ACCESS STATE CHANGED for
981 * the initiator port associated with every I_T nexus
982 * other than the I_T nexus on which the SET TARGET
983 * PORT GROUPS command was received.
984 */
985 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
986 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
987 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
988 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
989 continue;
990
991 /*
992 * se_deve->se_lun_acl pointer may be NULL for a
993 * entry created without explicit Node+MappedLUN ACLs
994 */
995 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
996 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
997 continue;
998
999 core_scsi3_ua_allocate(se_deve, 0x2A,
1000 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1001 }
1002 spin_unlock(&lun->lun_deve_lock);
1003
1004 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1005 percpu_ref_put(&lun->lun_ref);
1006 }
1007 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1008 }
1009
core_alua_do_transition_tg_pt_work(struct work_struct * work)1010 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
1011 {
1012 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
1013 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work);
1014 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1015 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
1016 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
1017
1018 /*
1019 * Update the ALUA metadata buf that has been allocated in
1020 * core_alua_do_port_transition(), this metadata will be written
1021 * to struct file.
1022 *
1023 * Note that there is the case where we do not want to update the
1024 * metadata when the saved metadata is being parsed in userspace
1025 * when setting the existing port access state and access status.
1026 *
1027 * Also note that the failure to write out the ALUA metadata to
1028 * struct file does NOT affect the actual ALUA transition.
1029 */
1030 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1031 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1032 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1033 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1034 }
1035 /*
1036 * Set the current primary ALUA access state to the requested new state
1037 */
1038 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1039 tg_pt_gp->tg_pt_gp_alua_pending_state);
1040
1041 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1042 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1043 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1044 tg_pt_gp->tg_pt_gp_id,
1045 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1046 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1047
1048 core_alua_queue_state_change_ua(tg_pt_gp);
1049
1050 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1051 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1052 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1053
1054 if (tg_pt_gp->tg_pt_gp_transition_complete)
1055 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1056 }
1057
core_alua_do_transition_tg_pt(struct t10_alua_tg_pt_gp * tg_pt_gp,int new_state,int explicit)1058 static int core_alua_do_transition_tg_pt(
1059 struct t10_alua_tg_pt_gp *tg_pt_gp,
1060 int new_state,
1061 int explicit)
1062 {
1063 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1064 DECLARE_COMPLETION_ONSTACK(wait);
1065
1066 /* Nothing to be done here */
1067 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1068 return 0;
1069
1070 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1071 return -EAGAIN;
1072
1073 /*
1074 * Flush any pending transitions
1075 */
1076 if (!explicit)
1077 flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
1078
1079 /*
1080 * Save the old primary ALUA access state, and set the current state
1081 * to ALUA_ACCESS_STATE_TRANSITION.
1082 */
1083 tg_pt_gp->tg_pt_gp_alua_previous_state =
1084 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1085 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1086
1087 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1088 ALUA_ACCESS_STATE_TRANSITION);
1089 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1090 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1091 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1092
1093 core_alua_queue_state_change_ua(tg_pt_gp);
1094
1095 /*
1096 * Check for the optional ALUA primary state transition delay
1097 */
1098 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1099 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1100
1101 /*
1102 * Take a reference for workqueue item
1103 */
1104 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1105 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1106 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1107
1108 schedule_work(&tg_pt_gp->tg_pt_gp_transition_work);
1109 if (explicit) {
1110 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1111 wait_for_completion(&wait);
1112 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1113 }
1114
1115 return 0;
1116 }
1117
core_alua_do_port_transition(struct t10_alua_tg_pt_gp * l_tg_pt_gp,struct se_device * l_dev,struct se_lun * l_lun,struct se_node_acl * l_nacl,int new_state,int explicit)1118 int core_alua_do_port_transition(
1119 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1120 struct se_device *l_dev,
1121 struct se_lun *l_lun,
1122 struct se_node_acl *l_nacl,
1123 int new_state,
1124 int explicit)
1125 {
1126 struct se_device *dev;
1127 struct t10_alua_lu_gp *lu_gp;
1128 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1129 struct t10_alua_tg_pt_gp *tg_pt_gp;
1130 int primary, valid_states, rc = 0;
1131
1132 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1133 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1134 return -EINVAL;
1135
1136 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1137 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1138 lu_gp = local_lu_gp_mem->lu_gp;
1139 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1140 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1141 /*
1142 * For storage objects that are members of the 'default_lu_gp',
1143 * we only do transition on the passed *l_tp_pt_gp, and not
1144 * on all of the matching target port groups IDs in default_lu_gp.
1145 */
1146 if (!lu_gp->lu_gp_id) {
1147 /*
1148 * core_alua_do_transition_tg_pt() will always return
1149 * success.
1150 */
1151 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1152 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1153 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1154 new_state, explicit);
1155 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1156 return rc;
1157 }
1158 /*
1159 * For all other LU groups aside from 'default_lu_gp', walk all of
1160 * the associated storage objects looking for a matching target port
1161 * group ID from the local target port group.
1162 */
1163 spin_lock(&lu_gp->lu_gp_lock);
1164 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1165 lu_gp_mem_list) {
1166
1167 dev = lu_gp_mem->lu_gp_mem_dev;
1168 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1169 spin_unlock(&lu_gp->lu_gp_lock);
1170
1171 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1172 list_for_each_entry(tg_pt_gp,
1173 &dev->t10_alua.tg_pt_gps_list,
1174 tg_pt_gp_list) {
1175
1176 if (!tg_pt_gp->tg_pt_gp_valid_id)
1177 continue;
1178 /*
1179 * If the target behavior port asymmetric access state
1180 * is changed for any target port group accessible via
1181 * a logical unit within a LU group, the target port
1182 * behavior group asymmetric access states for the same
1183 * target port group accessible via other logical units
1184 * in that LU group will also change.
1185 */
1186 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1187 continue;
1188
1189 if (l_tg_pt_gp == tg_pt_gp) {
1190 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1191 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1192 } else {
1193 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1194 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1195 }
1196 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1197 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1198 /*
1199 * core_alua_do_transition_tg_pt() will always return
1200 * success.
1201 */
1202 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1203 new_state, explicit);
1204
1205 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1206 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1207 if (rc)
1208 break;
1209 }
1210 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1211
1212 spin_lock(&lu_gp->lu_gp_lock);
1213 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1214 }
1215 spin_unlock(&lu_gp->lu_gp_lock);
1216
1217 if (!rc) {
1218 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1219 " Group IDs: %hu %s transition to primary state: %s\n",
1220 config_item_name(&lu_gp->lu_gp_group.cg_item),
1221 l_tg_pt_gp->tg_pt_gp_id,
1222 (explicit) ? "explicit" : "implicit",
1223 core_alua_dump_state(new_state));
1224 }
1225
1226 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1227 return rc;
1228 }
1229
core_alua_update_tpg_secondary_metadata(struct se_lun * lun)1230 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1231 {
1232 struct se_portal_group *se_tpg = lun->lun_tpg;
1233 unsigned char *md_buf;
1234 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1235 int len, rc;
1236
1237 mutex_lock(&lun->lun_tg_pt_md_mutex);
1238
1239 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1240 if (!md_buf) {
1241 pr_err("Unable to allocate buf for ALUA metadata\n");
1242 rc = -ENOMEM;
1243 goto out_unlock;
1244 }
1245
1246 memset(path, 0, ALUA_METADATA_PATH_LEN);
1247 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1248
1249 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1250 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1251
1252 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1253 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1254 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1255
1256 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1257 "alua_tg_pt_status=0x%02x\n",
1258 atomic_read(&lun->lun_tg_pt_secondary_offline),
1259 lun->lun_tg_pt_secondary_stat);
1260
1261 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%llu",
1262 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1263 lun->unpacked_lun);
1264
1265 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1266 kfree(md_buf);
1267
1268 out_unlock:
1269 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1270 return rc;
1271 }
1272
core_alua_set_tg_pt_secondary_state(struct se_lun * lun,int explicit,int offline)1273 static int core_alua_set_tg_pt_secondary_state(
1274 struct se_lun *lun,
1275 int explicit,
1276 int offline)
1277 {
1278 struct t10_alua_tg_pt_gp *tg_pt_gp;
1279 int trans_delay_msecs;
1280
1281 spin_lock(&lun->lun_tg_pt_gp_lock);
1282 tg_pt_gp = lun->lun_tg_pt_gp;
1283 if (!tg_pt_gp) {
1284 spin_unlock(&lun->lun_tg_pt_gp_lock);
1285 pr_err("Unable to complete secondary state"
1286 " transition\n");
1287 return -EINVAL;
1288 }
1289 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1290 /*
1291 * Set the secondary ALUA target port access state to OFFLINE
1292 * or release the previously secondary state for struct se_lun
1293 */
1294 if (offline)
1295 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1296 else
1297 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1298
1299 lun->lun_tg_pt_secondary_stat = (explicit) ?
1300 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1301 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1302
1303 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1304 " to secondary access state: %s\n", (explicit) ? "explicit" :
1305 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1306 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1307
1308 spin_unlock(&lun->lun_tg_pt_gp_lock);
1309 /*
1310 * Do the optional transition delay after we set the secondary
1311 * ALUA access state.
1312 */
1313 if (trans_delay_msecs != 0)
1314 msleep_interruptible(trans_delay_msecs);
1315 /*
1316 * See if we need to update the ALUA fabric port metadata for
1317 * secondary state and status
1318 */
1319 if (lun->lun_tg_pt_secondary_write_md)
1320 core_alua_update_tpg_secondary_metadata(lun);
1321
1322 return 0;
1323 }
1324
1325 struct t10_alua_lba_map *
core_alua_allocate_lba_map(struct list_head * list,u64 first_lba,u64 last_lba)1326 core_alua_allocate_lba_map(struct list_head *list,
1327 u64 first_lba, u64 last_lba)
1328 {
1329 struct t10_alua_lba_map *lba_map;
1330
1331 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1332 if (!lba_map) {
1333 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1334 return ERR_PTR(-ENOMEM);
1335 }
1336 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1337 lba_map->lba_map_first_lba = first_lba;
1338 lba_map->lba_map_last_lba = last_lba;
1339
1340 list_add_tail(&lba_map->lba_map_list, list);
1341 return lba_map;
1342 }
1343
1344 int
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map * lba_map,int pg_id,int state)1345 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1346 int pg_id, int state)
1347 {
1348 struct t10_alua_lba_map_member *lba_map_mem;
1349
1350 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1351 lba_map_mem_list) {
1352 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1353 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1354 return -EINVAL;
1355 }
1356 }
1357
1358 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1359 if (!lba_map_mem) {
1360 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1361 return -ENOMEM;
1362 }
1363 lba_map_mem->lba_map_mem_alua_state = state;
1364 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1365
1366 list_add_tail(&lba_map_mem->lba_map_mem_list,
1367 &lba_map->lba_map_mem_list);
1368 return 0;
1369 }
1370
1371 void
core_alua_free_lba_map(struct list_head * lba_list)1372 core_alua_free_lba_map(struct list_head *lba_list)
1373 {
1374 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1375 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1376
1377 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1378 lba_map_list) {
1379 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1380 &lba_map->lba_map_mem_list,
1381 lba_map_mem_list) {
1382 list_del(&lba_map_mem->lba_map_mem_list);
1383 kmem_cache_free(t10_alua_lba_map_mem_cache,
1384 lba_map_mem);
1385 }
1386 list_del(&lba_map->lba_map_list);
1387 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1388 }
1389 }
1390
1391 void
core_alua_set_lba_map(struct se_device * dev,struct list_head * lba_map_list,int segment_size,int segment_mult)1392 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1393 int segment_size, int segment_mult)
1394 {
1395 struct list_head old_lba_map_list;
1396 struct t10_alua_tg_pt_gp *tg_pt_gp;
1397 int activate = 0, supported;
1398
1399 INIT_LIST_HEAD(&old_lba_map_list);
1400 spin_lock(&dev->t10_alua.lba_map_lock);
1401 dev->t10_alua.lba_map_segment_size = segment_size;
1402 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1403 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1404 if (lba_map_list) {
1405 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1406 activate = 1;
1407 }
1408 spin_unlock(&dev->t10_alua.lba_map_lock);
1409 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1410 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1411 tg_pt_gp_list) {
1412
1413 if (!tg_pt_gp->tg_pt_gp_valid_id)
1414 continue;
1415 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1416 if (activate)
1417 supported |= ALUA_LBD_SUP;
1418 else
1419 supported &= ~ALUA_LBD_SUP;
1420 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1421 }
1422 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1423 core_alua_free_lba_map(&old_lba_map_list);
1424 }
1425
1426 struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char * name,int def_group)1427 core_alua_allocate_lu_gp(const char *name, int def_group)
1428 {
1429 struct t10_alua_lu_gp *lu_gp;
1430
1431 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1432 if (!lu_gp) {
1433 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1434 return ERR_PTR(-ENOMEM);
1435 }
1436 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1437 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1438 spin_lock_init(&lu_gp->lu_gp_lock);
1439 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1440
1441 if (def_group) {
1442 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1443 lu_gp->lu_gp_valid_id = 1;
1444 alua_lu_gps_count++;
1445 }
1446
1447 return lu_gp;
1448 }
1449
core_alua_set_lu_gp_id(struct t10_alua_lu_gp * lu_gp,u16 lu_gp_id)1450 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1451 {
1452 struct t10_alua_lu_gp *lu_gp_tmp;
1453 u16 lu_gp_id_tmp;
1454 /*
1455 * The lu_gp->lu_gp_id may only be set once..
1456 */
1457 if (lu_gp->lu_gp_valid_id) {
1458 pr_warn("ALUA LU Group already has a valid ID,"
1459 " ignoring request\n");
1460 return -EINVAL;
1461 }
1462
1463 spin_lock(&lu_gps_lock);
1464 if (alua_lu_gps_count == 0x0000ffff) {
1465 pr_err("Maximum ALUA alua_lu_gps_count:"
1466 " 0x0000ffff reached\n");
1467 spin_unlock(&lu_gps_lock);
1468 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1469 return -ENOSPC;
1470 }
1471 again:
1472 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1473 alua_lu_gps_counter++;
1474
1475 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1476 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1477 if (!lu_gp_id)
1478 goto again;
1479
1480 pr_warn("ALUA Logical Unit Group ID: %hu"
1481 " already exists, ignoring request\n",
1482 lu_gp_id);
1483 spin_unlock(&lu_gps_lock);
1484 return -EINVAL;
1485 }
1486 }
1487
1488 lu_gp->lu_gp_id = lu_gp_id_tmp;
1489 lu_gp->lu_gp_valid_id = 1;
1490 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1491 alua_lu_gps_count++;
1492 spin_unlock(&lu_gps_lock);
1493
1494 return 0;
1495 }
1496
1497 static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device * dev)1498 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1499 {
1500 struct t10_alua_lu_gp_member *lu_gp_mem;
1501
1502 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1503 if (!lu_gp_mem) {
1504 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1505 return ERR_PTR(-ENOMEM);
1506 }
1507 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1508 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1509 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1510
1511 lu_gp_mem->lu_gp_mem_dev = dev;
1512 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1513
1514 return lu_gp_mem;
1515 }
1516
core_alua_free_lu_gp(struct t10_alua_lu_gp * lu_gp)1517 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1518 {
1519 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1520 /*
1521 * Once we have reached this point, config_item_put() has
1522 * already been called from target_core_alua_drop_lu_gp().
1523 *
1524 * Here, we remove the *lu_gp from the global list so that
1525 * no associations can be made while we are releasing
1526 * struct t10_alua_lu_gp.
1527 */
1528 spin_lock(&lu_gps_lock);
1529 list_del(&lu_gp->lu_gp_node);
1530 alua_lu_gps_count--;
1531 spin_unlock(&lu_gps_lock);
1532 /*
1533 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1534 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1535 * released with core_alua_put_lu_gp_from_name()
1536 */
1537 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1538 cpu_relax();
1539 /*
1540 * Release reference to struct t10_alua_lu_gp * from all associated
1541 * struct se_device.
1542 */
1543 spin_lock(&lu_gp->lu_gp_lock);
1544 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1545 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1546 if (lu_gp_mem->lu_gp_assoc) {
1547 list_del(&lu_gp_mem->lu_gp_mem_list);
1548 lu_gp->lu_gp_members--;
1549 lu_gp_mem->lu_gp_assoc = 0;
1550 }
1551 spin_unlock(&lu_gp->lu_gp_lock);
1552 /*
1553 *
1554 * lu_gp_mem is associated with a single
1555 * struct se_device->dev_alua_lu_gp_mem, and is released when
1556 * struct se_device is released via core_alua_free_lu_gp_mem().
1557 *
1558 * If the passed lu_gp does NOT match the default_lu_gp, assume
1559 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1560 */
1561 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1562 if (lu_gp != default_lu_gp)
1563 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1564 default_lu_gp);
1565 else
1566 lu_gp_mem->lu_gp = NULL;
1567 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1568
1569 spin_lock(&lu_gp->lu_gp_lock);
1570 }
1571 spin_unlock(&lu_gp->lu_gp_lock);
1572
1573 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1574 }
1575
core_alua_free_lu_gp_mem(struct se_device * dev)1576 void core_alua_free_lu_gp_mem(struct se_device *dev)
1577 {
1578 struct t10_alua_lu_gp *lu_gp;
1579 struct t10_alua_lu_gp_member *lu_gp_mem;
1580
1581 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1582 if (!lu_gp_mem)
1583 return;
1584
1585 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1586 cpu_relax();
1587
1588 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1589 lu_gp = lu_gp_mem->lu_gp;
1590 if (lu_gp) {
1591 spin_lock(&lu_gp->lu_gp_lock);
1592 if (lu_gp_mem->lu_gp_assoc) {
1593 list_del(&lu_gp_mem->lu_gp_mem_list);
1594 lu_gp->lu_gp_members--;
1595 lu_gp_mem->lu_gp_assoc = 0;
1596 }
1597 spin_unlock(&lu_gp->lu_gp_lock);
1598 lu_gp_mem->lu_gp = NULL;
1599 }
1600 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1601
1602 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1603 }
1604
core_alua_get_lu_gp_by_name(const char * name)1605 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1606 {
1607 struct t10_alua_lu_gp *lu_gp;
1608 struct config_item *ci;
1609
1610 spin_lock(&lu_gps_lock);
1611 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1612 if (!lu_gp->lu_gp_valid_id)
1613 continue;
1614 ci = &lu_gp->lu_gp_group.cg_item;
1615 if (!strcmp(config_item_name(ci), name)) {
1616 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1617 spin_unlock(&lu_gps_lock);
1618 return lu_gp;
1619 }
1620 }
1621 spin_unlock(&lu_gps_lock);
1622
1623 return NULL;
1624 }
1625
core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp * lu_gp)1626 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1627 {
1628 spin_lock(&lu_gps_lock);
1629 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1630 spin_unlock(&lu_gps_lock);
1631 }
1632
1633 /*
1634 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1635 */
__core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1636 void __core_alua_attach_lu_gp_mem(
1637 struct t10_alua_lu_gp_member *lu_gp_mem,
1638 struct t10_alua_lu_gp *lu_gp)
1639 {
1640 spin_lock(&lu_gp->lu_gp_lock);
1641 lu_gp_mem->lu_gp = lu_gp;
1642 lu_gp_mem->lu_gp_assoc = 1;
1643 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1644 lu_gp->lu_gp_members++;
1645 spin_unlock(&lu_gp->lu_gp_lock);
1646 }
1647
1648 /*
1649 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1650 */
__core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1651 void __core_alua_drop_lu_gp_mem(
1652 struct t10_alua_lu_gp_member *lu_gp_mem,
1653 struct t10_alua_lu_gp *lu_gp)
1654 {
1655 spin_lock(&lu_gp->lu_gp_lock);
1656 list_del(&lu_gp_mem->lu_gp_mem_list);
1657 lu_gp_mem->lu_gp = NULL;
1658 lu_gp_mem->lu_gp_assoc = 0;
1659 lu_gp->lu_gp_members--;
1660 spin_unlock(&lu_gp->lu_gp_lock);
1661 }
1662
core_alua_allocate_tg_pt_gp(struct se_device * dev,const char * name,int def_group)1663 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1664 const char *name, int def_group)
1665 {
1666 struct t10_alua_tg_pt_gp *tg_pt_gp;
1667
1668 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1669 if (!tg_pt_gp) {
1670 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1671 return NULL;
1672 }
1673 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1674 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1675 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1676 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1677 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1678 INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1679 core_alua_do_transition_tg_pt_work);
1680 tg_pt_gp->tg_pt_gp_dev = dev;
1681 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1682 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1683 /*
1684 * Enable both explicit and implicit ALUA support by default
1685 */
1686 tg_pt_gp->tg_pt_gp_alua_access_type =
1687 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1688 /*
1689 * Set the default Active/NonOptimized Delay in milliseconds
1690 */
1691 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1692 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1693 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1694
1695 /*
1696 * Enable all supported states
1697 */
1698 tg_pt_gp->tg_pt_gp_alua_supported_states =
1699 ALUA_T_SUP | ALUA_O_SUP |
1700 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1701
1702 if (def_group) {
1703 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1704 tg_pt_gp->tg_pt_gp_id =
1705 dev->t10_alua.alua_tg_pt_gps_counter++;
1706 tg_pt_gp->tg_pt_gp_valid_id = 1;
1707 dev->t10_alua.alua_tg_pt_gps_count++;
1708 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1709 &dev->t10_alua.tg_pt_gps_list);
1710 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1711 }
1712
1713 return tg_pt_gp;
1714 }
1715
core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp * tg_pt_gp,u16 tg_pt_gp_id)1716 int core_alua_set_tg_pt_gp_id(
1717 struct t10_alua_tg_pt_gp *tg_pt_gp,
1718 u16 tg_pt_gp_id)
1719 {
1720 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1721 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1722 u16 tg_pt_gp_id_tmp;
1723
1724 /*
1725 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1726 */
1727 if (tg_pt_gp->tg_pt_gp_valid_id) {
1728 pr_warn("ALUA TG PT Group already has a valid ID,"
1729 " ignoring request\n");
1730 return -EINVAL;
1731 }
1732
1733 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1734 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1735 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1736 " 0x0000ffff reached\n");
1737 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1738 return -ENOSPC;
1739 }
1740 again:
1741 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1742 dev->t10_alua.alua_tg_pt_gps_counter++;
1743
1744 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1745 tg_pt_gp_list) {
1746 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1747 if (!tg_pt_gp_id)
1748 goto again;
1749
1750 pr_err("ALUA Target Port Group ID: %hu already"
1751 " exists, ignoring request\n", tg_pt_gp_id);
1752 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1753 return -EINVAL;
1754 }
1755 }
1756
1757 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1758 tg_pt_gp->tg_pt_gp_valid_id = 1;
1759 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1760 &dev->t10_alua.tg_pt_gps_list);
1761 dev->t10_alua.alua_tg_pt_gps_count++;
1762 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1763
1764 return 0;
1765 }
1766
core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp * tg_pt_gp)1767 void core_alua_free_tg_pt_gp(
1768 struct t10_alua_tg_pt_gp *tg_pt_gp)
1769 {
1770 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1771 struct se_lun *lun, *next;
1772
1773 /*
1774 * Once we have reached this point, config_item_put() has already
1775 * been called from target_core_alua_drop_tg_pt_gp().
1776 *
1777 * Here we remove *tg_pt_gp from the global list so that
1778 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1779 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1780 */
1781 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1782 list_del(&tg_pt_gp->tg_pt_gp_list);
1783 dev->t10_alua.alua_tg_pt_gps_counter--;
1784 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1785
1786 flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
1787
1788 /*
1789 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1790 * core_alua_get_tg_pt_gp_by_name() in
1791 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1792 * to be released with core_alua_put_tg_pt_gp_from_name().
1793 */
1794 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1795 cpu_relax();
1796
1797 /*
1798 * Release reference to struct t10_alua_tg_pt_gp from all associated
1799 * struct se_port.
1800 */
1801 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1802 list_for_each_entry_safe(lun, next,
1803 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1804 list_del_init(&lun->lun_tg_pt_gp_link);
1805 tg_pt_gp->tg_pt_gp_members--;
1806
1807 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1808 /*
1809 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1810 * assume we want to re-associate a given tg_pt_gp_mem with
1811 * default_tg_pt_gp.
1812 */
1813 spin_lock(&lun->lun_tg_pt_gp_lock);
1814 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1815 __target_attach_tg_pt_gp(lun,
1816 dev->t10_alua.default_tg_pt_gp);
1817 } else
1818 lun->lun_tg_pt_gp = NULL;
1819 spin_unlock(&lun->lun_tg_pt_gp_lock);
1820
1821 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1822 }
1823 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1824
1825 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1826 }
1827
core_alua_get_tg_pt_gp_by_name(struct se_device * dev,const char * name)1828 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1829 struct se_device *dev, const char *name)
1830 {
1831 struct t10_alua_tg_pt_gp *tg_pt_gp;
1832 struct config_item *ci;
1833
1834 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1835 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1836 tg_pt_gp_list) {
1837 if (!tg_pt_gp->tg_pt_gp_valid_id)
1838 continue;
1839 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1840 if (!strcmp(config_item_name(ci), name)) {
1841 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1842 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1843 return tg_pt_gp;
1844 }
1845 }
1846 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1847
1848 return NULL;
1849 }
1850
core_alua_put_tg_pt_gp_from_name(struct t10_alua_tg_pt_gp * tg_pt_gp)1851 static void core_alua_put_tg_pt_gp_from_name(
1852 struct t10_alua_tg_pt_gp *tg_pt_gp)
1853 {
1854 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1855
1856 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1857 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1858 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1859 }
1860
__target_attach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1861 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1862 struct t10_alua_tg_pt_gp *tg_pt_gp)
1863 {
1864 struct se_dev_entry *se_deve;
1865
1866 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1867
1868 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1869 lun->lun_tg_pt_gp = tg_pt_gp;
1870 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1871 tg_pt_gp->tg_pt_gp_members++;
1872 spin_lock(&lun->lun_deve_lock);
1873 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1874 core_scsi3_ua_allocate(se_deve, 0x3f,
1875 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1876 spin_unlock(&lun->lun_deve_lock);
1877 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1878 }
1879
target_attach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1880 void target_attach_tg_pt_gp(struct se_lun *lun,
1881 struct t10_alua_tg_pt_gp *tg_pt_gp)
1882 {
1883 spin_lock(&lun->lun_tg_pt_gp_lock);
1884 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1885 spin_unlock(&lun->lun_tg_pt_gp_lock);
1886 }
1887
__target_detach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1888 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1889 struct t10_alua_tg_pt_gp *tg_pt_gp)
1890 {
1891 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1892
1893 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1894 list_del_init(&lun->lun_tg_pt_gp_link);
1895 tg_pt_gp->tg_pt_gp_members--;
1896 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1897
1898 lun->lun_tg_pt_gp = NULL;
1899 }
1900
target_detach_tg_pt_gp(struct se_lun * lun)1901 void target_detach_tg_pt_gp(struct se_lun *lun)
1902 {
1903 struct t10_alua_tg_pt_gp *tg_pt_gp;
1904
1905 spin_lock(&lun->lun_tg_pt_gp_lock);
1906 tg_pt_gp = lun->lun_tg_pt_gp;
1907 if (tg_pt_gp)
1908 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1909 spin_unlock(&lun->lun_tg_pt_gp_lock);
1910 }
1911
core_alua_show_tg_pt_gp_info(struct se_lun * lun,char * page)1912 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1913 {
1914 struct config_item *tg_pt_ci;
1915 struct t10_alua_tg_pt_gp *tg_pt_gp;
1916 ssize_t len = 0;
1917
1918 spin_lock(&lun->lun_tg_pt_gp_lock);
1919 tg_pt_gp = lun->lun_tg_pt_gp;
1920 if (tg_pt_gp) {
1921 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1922 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1923 " %hu\nTG Port Primary Access State: %s\nTG Port "
1924 "Primary Access Status: %s\nTG Port Secondary Access"
1925 " State: %s\nTG Port Secondary Access Status: %s\n",
1926 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1927 core_alua_dump_state(atomic_read(
1928 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1929 core_alua_dump_status(
1930 tg_pt_gp->tg_pt_gp_alua_access_status),
1931 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1932 "Offline" : "None",
1933 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1934 }
1935 spin_unlock(&lun->lun_tg_pt_gp_lock);
1936
1937 return len;
1938 }
1939
core_alua_store_tg_pt_gp_info(struct se_lun * lun,const char * page,size_t count)1940 ssize_t core_alua_store_tg_pt_gp_info(
1941 struct se_lun *lun,
1942 const char *page,
1943 size_t count)
1944 {
1945 struct se_portal_group *tpg = lun->lun_tpg;
1946 /*
1947 * rcu_dereference_raw protected by se_lun->lun_group symlink
1948 * reference to se_device->dev_group.
1949 */
1950 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1951 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1952 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1953 int move = 0;
1954
1955 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
1956 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1957 return -ENODEV;
1958
1959 if (count > TG_PT_GROUP_NAME_BUF) {
1960 pr_err("ALUA Target Port Group alias too large!\n");
1961 return -EINVAL;
1962 }
1963 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1964 memcpy(buf, page, count);
1965 /*
1966 * Any ALUA target port group alias besides "NULL" means we will be
1967 * making a new group association.
1968 */
1969 if (strcmp(strstrip(buf), "NULL")) {
1970 /*
1971 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1972 * struct t10_alua_tg_pt_gp. This reference is released with
1973 * core_alua_put_tg_pt_gp_from_name() below.
1974 */
1975 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1976 strstrip(buf));
1977 if (!tg_pt_gp_new)
1978 return -ENODEV;
1979 }
1980
1981 spin_lock(&lun->lun_tg_pt_gp_lock);
1982 tg_pt_gp = lun->lun_tg_pt_gp;
1983 if (tg_pt_gp) {
1984 /*
1985 * Clearing an existing tg_pt_gp association, and replacing
1986 * with the default_tg_pt_gp.
1987 */
1988 if (!tg_pt_gp_new) {
1989 pr_debug("Target_Core_ConfigFS: Moving"
1990 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1991 " alua/%s, ID: %hu back to"
1992 " default_tg_pt_gp\n",
1993 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1994 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1995 config_item_name(&lun->lun_group.cg_item),
1996 config_item_name(
1997 &tg_pt_gp->tg_pt_gp_group.cg_item),
1998 tg_pt_gp->tg_pt_gp_id);
1999
2000 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2001 __target_attach_tg_pt_gp(lun,
2002 dev->t10_alua.default_tg_pt_gp);
2003 spin_unlock(&lun->lun_tg_pt_gp_lock);
2004
2005 return count;
2006 }
2007 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2008 move = 1;
2009 }
2010
2011 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
2012 spin_unlock(&lun->lun_tg_pt_gp_lock);
2013 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2014 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2015 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2016 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2017 config_item_name(&lun->lun_group.cg_item),
2018 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2019 tg_pt_gp_new->tg_pt_gp_id);
2020
2021 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2022 return count;
2023 }
2024
core_alua_show_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2025 ssize_t core_alua_show_access_type(
2026 struct t10_alua_tg_pt_gp *tg_pt_gp,
2027 char *page)
2028 {
2029 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2030 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2031 return sprintf(page, "Implicit and Explicit\n");
2032 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2033 return sprintf(page, "Implicit\n");
2034 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2035 return sprintf(page, "Explicit\n");
2036 else
2037 return sprintf(page, "None\n");
2038 }
2039
core_alua_store_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2040 ssize_t core_alua_store_access_type(
2041 struct t10_alua_tg_pt_gp *tg_pt_gp,
2042 const char *page,
2043 size_t count)
2044 {
2045 unsigned long tmp;
2046 int ret;
2047
2048 ret = kstrtoul(page, 0, &tmp);
2049 if (ret < 0) {
2050 pr_err("Unable to extract alua_access_type\n");
2051 return ret;
2052 }
2053 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2054 pr_err("Illegal value for alua_access_type:"
2055 " %lu\n", tmp);
2056 return -EINVAL;
2057 }
2058 if (tmp == 3)
2059 tg_pt_gp->tg_pt_gp_alua_access_type =
2060 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2061 else if (tmp == 2)
2062 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2063 else if (tmp == 1)
2064 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2065 else
2066 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2067
2068 return count;
2069 }
2070
core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2071 ssize_t core_alua_show_nonop_delay_msecs(
2072 struct t10_alua_tg_pt_gp *tg_pt_gp,
2073 char *page)
2074 {
2075 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2076 }
2077
core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2078 ssize_t core_alua_store_nonop_delay_msecs(
2079 struct t10_alua_tg_pt_gp *tg_pt_gp,
2080 const char *page,
2081 size_t count)
2082 {
2083 unsigned long tmp;
2084 int ret;
2085
2086 ret = kstrtoul(page, 0, &tmp);
2087 if (ret < 0) {
2088 pr_err("Unable to extract nonop_delay_msecs\n");
2089 return ret;
2090 }
2091 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2092 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2093 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2094 ALUA_MAX_NONOP_DELAY_MSECS);
2095 return -EINVAL;
2096 }
2097 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2098
2099 return count;
2100 }
2101
core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2102 ssize_t core_alua_show_trans_delay_msecs(
2103 struct t10_alua_tg_pt_gp *tg_pt_gp,
2104 char *page)
2105 {
2106 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2107 }
2108
core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2109 ssize_t core_alua_store_trans_delay_msecs(
2110 struct t10_alua_tg_pt_gp *tg_pt_gp,
2111 const char *page,
2112 size_t count)
2113 {
2114 unsigned long tmp;
2115 int ret;
2116
2117 ret = kstrtoul(page, 0, &tmp);
2118 if (ret < 0) {
2119 pr_err("Unable to extract trans_delay_msecs\n");
2120 return ret;
2121 }
2122 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2123 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2124 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2125 ALUA_MAX_TRANS_DELAY_MSECS);
2126 return -EINVAL;
2127 }
2128 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2129
2130 return count;
2131 }
2132
core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2133 ssize_t core_alua_show_implicit_trans_secs(
2134 struct t10_alua_tg_pt_gp *tg_pt_gp,
2135 char *page)
2136 {
2137 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2138 }
2139
core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2140 ssize_t core_alua_store_implicit_trans_secs(
2141 struct t10_alua_tg_pt_gp *tg_pt_gp,
2142 const char *page,
2143 size_t count)
2144 {
2145 unsigned long tmp;
2146 int ret;
2147
2148 ret = kstrtoul(page, 0, &tmp);
2149 if (ret < 0) {
2150 pr_err("Unable to extract implicit_trans_secs\n");
2151 return ret;
2152 }
2153 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2154 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2155 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2156 ALUA_MAX_IMPLICIT_TRANS_SECS);
2157 return -EINVAL;
2158 }
2159 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2160
2161 return count;
2162 }
2163
core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2164 ssize_t core_alua_show_preferred_bit(
2165 struct t10_alua_tg_pt_gp *tg_pt_gp,
2166 char *page)
2167 {
2168 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2169 }
2170
core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2171 ssize_t core_alua_store_preferred_bit(
2172 struct t10_alua_tg_pt_gp *tg_pt_gp,
2173 const char *page,
2174 size_t count)
2175 {
2176 unsigned long tmp;
2177 int ret;
2178
2179 ret = kstrtoul(page, 0, &tmp);
2180 if (ret < 0) {
2181 pr_err("Unable to extract preferred ALUA value\n");
2182 return ret;
2183 }
2184 if ((tmp != 0) && (tmp != 1)) {
2185 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2186 return -EINVAL;
2187 }
2188 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2189
2190 return count;
2191 }
2192
core_alua_show_offline_bit(struct se_lun * lun,char * page)2193 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2194 {
2195 return sprintf(page, "%d\n",
2196 atomic_read(&lun->lun_tg_pt_secondary_offline));
2197 }
2198
core_alua_store_offline_bit(struct se_lun * lun,const char * page,size_t count)2199 ssize_t core_alua_store_offline_bit(
2200 struct se_lun *lun,
2201 const char *page,
2202 size_t count)
2203 {
2204 /*
2205 * rcu_dereference_raw protected by se_lun->lun_group symlink
2206 * reference to se_device->dev_group.
2207 */
2208 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2209 unsigned long tmp;
2210 int ret;
2211
2212 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
2213 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2214 return -ENODEV;
2215
2216 ret = kstrtoul(page, 0, &tmp);
2217 if (ret < 0) {
2218 pr_err("Unable to extract alua_tg_pt_offline value\n");
2219 return ret;
2220 }
2221 if ((tmp != 0) && (tmp != 1)) {
2222 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2223 tmp);
2224 return -EINVAL;
2225 }
2226
2227 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2228 if (ret < 0)
2229 return -EINVAL;
2230
2231 return count;
2232 }
2233
core_alua_show_secondary_status(struct se_lun * lun,char * page)2234 ssize_t core_alua_show_secondary_status(
2235 struct se_lun *lun,
2236 char *page)
2237 {
2238 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2239 }
2240
core_alua_store_secondary_status(struct se_lun * lun,const char * page,size_t count)2241 ssize_t core_alua_store_secondary_status(
2242 struct se_lun *lun,
2243 const char *page,
2244 size_t count)
2245 {
2246 unsigned long tmp;
2247 int ret;
2248
2249 ret = kstrtoul(page, 0, &tmp);
2250 if (ret < 0) {
2251 pr_err("Unable to extract alua_tg_pt_status\n");
2252 return ret;
2253 }
2254 if ((tmp != ALUA_STATUS_NONE) &&
2255 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2256 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2257 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2258 tmp);
2259 return -EINVAL;
2260 }
2261 lun->lun_tg_pt_secondary_stat = (int)tmp;
2262
2263 return count;
2264 }
2265
core_alua_show_secondary_write_metadata(struct se_lun * lun,char * page)2266 ssize_t core_alua_show_secondary_write_metadata(
2267 struct se_lun *lun,
2268 char *page)
2269 {
2270 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2271 }
2272
core_alua_store_secondary_write_metadata(struct se_lun * lun,const char * page,size_t count)2273 ssize_t core_alua_store_secondary_write_metadata(
2274 struct se_lun *lun,
2275 const char *page,
2276 size_t count)
2277 {
2278 unsigned long tmp;
2279 int ret;
2280
2281 ret = kstrtoul(page, 0, &tmp);
2282 if (ret < 0) {
2283 pr_err("Unable to extract alua_tg_pt_write_md\n");
2284 return ret;
2285 }
2286 if ((tmp != 0) && (tmp != 1)) {
2287 pr_err("Illegal value for alua_tg_pt_write_md:"
2288 " %lu\n", tmp);
2289 return -EINVAL;
2290 }
2291 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2292
2293 return count;
2294 }
2295
core_setup_alua(struct se_device * dev)2296 int core_setup_alua(struct se_device *dev)
2297 {
2298 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2299 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2300 struct t10_alua_lu_gp_member *lu_gp_mem;
2301
2302 /*
2303 * Associate this struct se_device with the default ALUA
2304 * LUN Group.
2305 */
2306 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2307 if (IS_ERR(lu_gp_mem))
2308 return PTR_ERR(lu_gp_mem);
2309
2310 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2311 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2312 default_lu_gp);
2313 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2314
2315 pr_debug("%s: Adding to default ALUA LU Group:"
2316 " core/alua/lu_gps/default_lu_gp\n",
2317 dev->transport->name);
2318 }
2319
2320 return 0;
2321 }
2322