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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[deliverable/linux.git] / drivers / target / target_core_alua.c
1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/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 int core_alua_state_nonoptimized(
459 struct se_cmd *cmd,
460 unsigned char *cdb,
461 int nonop_delay_msecs,
462 u8 *alua_ascq)
463 {
464 /*
465 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
466 * later to determine if processing of this cmd needs to be
467 * temporarily delayed for the Active/NonOptimized primary access state.
468 */
469 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
470 cmd->alua_nonop_delay = nonop_delay_msecs;
471 return 0;
472 }
473
474 static inline int core_alua_state_lba_dependent(
475 struct se_cmd *cmd,
476 struct t10_alua_tg_pt_gp *tg_pt_gp,
477 u8 *alua_ascq)
478 {
479 struct se_device *dev = cmd->se_dev;
480 u64 segment_size, segment_mult, sectors, lba;
481
482 /* Only need to check for cdb actually containing LBAs */
483 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
484 return 0;
485
486 spin_lock(&dev->t10_alua.lba_map_lock);
487 segment_size = dev->t10_alua.lba_map_segment_size;
488 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
489 sectors = cmd->data_length / dev->dev_attrib.block_size;
490
491 lba = cmd->t_task_lba;
492 while (lba < cmd->t_task_lba + sectors) {
493 struct t10_alua_lba_map *cur_map = NULL, *map;
494 struct t10_alua_lba_map_member *map_mem;
495
496 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
497 lba_map_list) {
498 u64 start_lba, last_lba;
499 u64 first_lba = map->lba_map_first_lba;
500
501 if (segment_mult) {
502 u64 tmp = lba;
503 start_lba = sector_div(tmp, segment_size * segment_mult);
504
505 last_lba = first_lba + segment_size - 1;
506 if (start_lba >= first_lba &&
507 start_lba <= last_lba) {
508 lba += segment_size;
509 cur_map = map;
510 break;
511 }
512 } else {
513 last_lba = map->lba_map_last_lba;
514 if (lba >= first_lba && lba <= last_lba) {
515 lba = last_lba + 1;
516 cur_map = map;
517 break;
518 }
519 }
520 }
521 if (!cur_map) {
522 spin_unlock(&dev->t10_alua.lba_map_lock);
523 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
524 return 1;
525 }
526 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
527 lba_map_mem_list) {
528 if (map_mem->lba_map_mem_alua_pg_id !=
529 tg_pt_gp->tg_pt_gp_id)
530 continue;
531 switch(map_mem->lba_map_mem_alua_state) {
532 case ALUA_ACCESS_STATE_STANDBY:
533 spin_unlock(&dev->t10_alua.lba_map_lock);
534 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
535 return 1;
536 case ALUA_ACCESS_STATE_UNAVAILABLE:
537 spin_unlock(&dev->t10_alua.lba_map_lock);
538 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
539 return 1;
540 default:
541 break;
542 }
543 }
544 }
545 spin_unlock(&dev->t10_alua.lba_map_lock);
546 return 0;
547 }
548
549 static inline int core_alua_state_standby(
550 struct se_cmd *cmd,
551 unsigned char *cdb,
552 u8 *alua_ascq)
553 {
554 /*
555 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
556 * spc4r17 section 5.9.2.4.4
557 */
558 switch (cdb[0]) {
559 case INQUIRY:
560 case LOG_SELECT:
561 case LOG_SENSE:
562 case MODE_SELECT:
563 case MODE_SENSE:
564 case REPORT_LUNS:
565 case RECEIVE_DIAGNOSTIC:
566 case SEND_DIAGNOSTIC:
567 return 0;
568 case MAINTENANCE_IN:
569 switch (cdb[1] & 0x1f) {
570 case MI_REPORT_TARGET_PGS:
571 return 0;
572 default:
573 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
574 return 1;
575 }
576 case MAINTENANCE_OUT:
577 switch (cdb[1]) {
578 case MO_SET_TARGET_PGS:
579 return 0;
580 default:
581 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
582 return 1;
583 }
584 case REQUEST_SENSE:
585 case PERSISTENT_RESERVE_IN:
586 case PERSISTENT_RESERVE_OUT:
587 case READ_BUFFER:
588 case WRITE_BUFFER:
589 return 0;
590 default:
591 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
592 return 1;
593 }
594
595 return 0;
596 }
597
598 static inline int core_alua_state_unavailable(
599 struct se_cmd *cmd,
600 unsigned char *cdb,
601 u8 *alua_ascq)
602 {
603 /*
604 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
605 * spc4r17 section 5.9.2.4.5
606 */
607 switch (cdb[0]) {
608 case INQUIRY:
609 case REPORT_LUNS:
610 return 0;
611 case MAINTENANCE_IN:
612 switch (cdb[1] & 0x1f) {
613 case MI_REPORT_TARGET_PGS:
614 return 0;
615 default:
616 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
617 return 1;
618 }
619 case MAINTENANCE_OUT:
620 switch (cdb[1]) {
621 case MO_SET_TARGET_PGS:
622 return 0;
623 default:
624 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
625 return 1;
626 }
627 case REQUEST_SENSE:
628 case READ_BUFFER:
629 case WRITE_BUFFER:
630 return 0;
631 default:
632 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
633 return 1;
634 }
635
636 return 0;
637 }
638
639 static inline int core_alua_state_transition(
640 struct se_cmd *cmd,
641 unsigned char *cdb,
642 u8 *alua_ascq)
643 {
644 /*
645 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
646 * spc4r17 section 5.9.2.5
647 */
648 switch (cdb[0]) {
649 case INQUIRY:
650 case REPORT_LUNS:
651 return 0;
652 case MAINTENANCE_IN:
653 switch (cdb[1] & 0x1f) {
654 case MI_REPORT_TARGET_PGS:
655 return 0;
656 default:
657 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
658 return 1;
659 }
660 case REQUEST_SENSE:
661 case READ_BUFFER:
662 case WRITE_BUFFER:
663 return 0;
664 default:
665 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
666 return 1;
667 }
668
669 return 0;
670 }
671
672 /*
673 * return 1: Is used to signal LUN not accessible, and check condition/not ready
674 * return 0: Used to signal success
675 * return -1: Used to signal failure, and invalid cdb field
676 */
677 sense_reason_t
678 target_alua_state_check(struct se_cmd *cmd)
679 {
680 struct se_device *dev = cmd->se_dev;
681 unsigned char *cdb = cmd->t_task_cdb;
682 struct se_lun *lun = cmd->se_lun;
683 struct se_port *port = lun->lun_sep;
684 struct t10_alua_tg_pt_gp *tg_pt_gp;
685 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
686 int out_alua_state, nonop_delay_msecs;
687 u8 alua_ascq;
688 int ret;
689
690 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
691 return 0;
692 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
693 return 0;
694
695 if (!port)
696 return 0;
697 /*
698 * First, check for a struct se_port specific secondary ALUA target port
699 * access state: OFFLINE
700 */
701 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
702 pr_debug("ALUA: Got secondary offline status for local"
703 " target port\n");
704 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
705 ret = 1;
706 goto out;
707 }
708 /*
709 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
710 * ALUA target port group, to obtain current ALUA access state.
711 * Otherwise look for the underlying struct se_device association with
712 * a ALUA logical unit group.
713 */
714 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
715 if (!tg_pt_gp_mem)
716 return 0;
717
718 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
719 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
720 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
721 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
722 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
723 /*
724 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
725 * statement so the compiler knows explicitly to check this case first.
726 * For the Optimized ALUA access state case, we want to process the
727 * incoming fabric cmd ASAP..
728 */
729 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
730 return 0;
731
732 switch (out_alua_state) {
733 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
734 ret = core_alua_state_nonoptimized(cmd, cdb,
735 nonop_delay_msecs, &alua_ascq);
736 break;
737 case ALUA_ACCESS_STATE_STANDBY:
738 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
739 break;
740 case ALUA_ACCESS_STATE_UNAVAILABLE:
741 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
742 break;
743 case ALUA_ACCESS_STATE_TRANSITION:
744 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
745 break;
746 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
747 ret = core_alua_state_lba_dependent(cmd, tg_pt_gp, &alua_ascq);
748 break;
749 /*
750 * OFFLINE is a secondary ALUA target port group access state, that is
751 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
752 */
753 case ALUA_ACCESS_STATE_OFFLINE:
754 default:
755 pr_err("Unknown ALUA access state: 0x%02x\n",
756 out_alua_state);
757 return TCM_INVALID_CDB_FIELD;
758 }
759
760 out:
761 if (ret > 0) {
762 /*
763 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
764 * The ALUA additional sense code qualifier (ASCQ) is determined
765 * by the ALUA primary or secondary access state..
766 */
767 pr_debug("[%s]: ALUA TG Port not available, "
768 "SenseKey: NOT_READY, ASC/ASCQ: "
769 "0x04/0x%02x\n",
770 cmd->se_tfo->get_fabric_name(), alua_ascq);
771
772 cmd->scsi_asc = 0x04;
773 cmd->scsi_ascq = alua_ascq;
774 return TCM_CHECK_CONDITION_NOT_READY;
775 }
776
777 return 0;
778 }
779
780 /*
781 * Check implicit and explicit ALUA state change request.
782 */
783 static sense_reason_t
784 core_alua_check_transition(int state, int valid, int *primary)
785 {
786 /*
787 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
788 * defined as primary target port asymmetric access states.
789 */
790 switch (state) {
791 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
792 if (!(valid & ALUA_AO_SUP))
793 goto not_supported;
794 *primary = 1;
795 break;
796 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
797 if (!(valid & ALUA_AN_SUP))
798 goto not_supported;
799 *primary = 1;
800 break;
801 case ALUA_ACCESS_STATE_STANDBY:
802 if (!(valid & ALUA_S_SUP))
803 goto not_supported;
804 *primary = 1;
805 break;
806 case ALUA_ACCESS_STATE_UNAVAILABLE:
807 if (!(valid & ALUA_U_SUP))
808 goto not_supported;
809 *primary = 1;
810 break;
811 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
812 if (!(valid & ALUA_LBD_SUP))
813 goto not_supported;
814 *primary = 1;
815 break;
816 case ALUA_ACCESS_STATE_OFFLINE:
817 /*
818 * OFFLINE state is defined as a secondary target port
819 * asymmetric access state.
820 */
821 if (!(valid & ALUA_O_SUP))
822 goto not_supported;
823 *primary = 0;
824 break;
825 case ALUA_ACCESS_STATE_TRANSITION:
826 /*
827 * Transitioning is set internally, and
828 * cannot be selected manually.
829 */
830 goto not_supported;
831 default:
832 pr_err("Unknown ALUA access state: 0x%02x\n", state);
833 return TCM_INVALID_PARAMETER_LIST;
834 }
835
836 return 0;
837
838 not_supported:
839 pr_err("ALUA access state %s not supported",
840 core_alua_dump_state(state));
841 return TCM_INVALID_PARAMETER_LIST;
842 }
843
844 static char *core_alua_dump_state(int state)
845 {
846 switch (state) {
847 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
848 return "Active/Optimized";
849 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
850 return "Active/NonOptimized";
851 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
852 return "LBA Dependent";
853 case ALUA_ACCESS_STATE_STANDBY:
854 return "Standby";
855 case ALUA_ACCESS_STATE_UNAVAILABLE:
856 return "Unavailable";
857 case ALUA_ACCESS_STATE_OFFLINE:
858 return "Offline";
859 case ALUA_ACCESS_STATE_TRANSITION:
860 return "Transitioning";
861 default:
862 return "Unknown";
863 }
864
865 return NULL;
866 }
867
868 char *core_alua_dump_status(int status)
869 {
870 switch (status) {
871 case ALUA_STATUS_NONE:
872 return "None";
873 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
874 return "Altered by Explicit STPG";
875 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
876 return "Altered by Implicit ALUA";
877 default:
878 return "Unknown";
879 }
880
881 return NULL;
882 }
883
884 /*
885 * Used by fabric modules to determine when we need to delay processing
886 * for the Active/NonOptimized paths..
887 */
888 int core_alua_check_nonop_delay(
889 struct se_cmd *cmd)
890 {
891 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
892 return 0;
893 if (in_interrupt())
894 return 0;
895 /*
896 * The ALUA Active/NonOptimized access state delay can be disabled
897 * in via configfs with a value of zero
898 */
899 if (!cmd->alua_nonop_delay)
900 return 0;
901 /*
902 * struct se_cmd->alua_nonop_delay gets set by a target port group
903 * defined interval in core_alua_state_nonoptimized()
904 */
905 msleep_interruptible(cmd->alua_nonop_delay);
906 return 0;
907 }
908 EXPORT_SYMBOL(core_alua_check_nonop_delay);
909
910 /*
911 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
912 *
913 */
914 static int core_alua_write_tpg_metadata(
915 const char *path,
916 unsigned char *md_buf,
917 u32 md_buf_len)
918 {
919 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
920 int ret;
921
922 if (IS_ERR(file)) {
923 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
924 return -ENODEV;
925 }
926 ret = kernel_write(file, md_buf, md_buf_len, 0);
927 if (ret < 0)
928 pr_err("Error writing ALUA metadata file: %s\n", path);
929 fput(file);
930 return (ret < 0) ? -EIO : 0;
931 }
932
933 /*
934 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
935 */
936 static int core_alua_update_tpg_primary_metadata(
937 struct t10_alua_tg_pt_gp *tg_pt_gp)
938 {
939 unsigned char *md_buf;
940 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
941 char path[ALUA_METADATA_PATH_LEN];
942 int len, rc;
943
944 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
945 if (!md_buf) {
946 pr_err("Unable to allocate buf for ALUA metadata\n");
947 return -ENOMEM;
948 }
949
950 memset(path, 0, ALUA_METADATA_PATH_LEN);
951
952 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
953 "tg_pt_gp_id=%hu\n"
954 "alua_access_state=0x%02x\n"
955 "alua_access_status=0x%02x\n",
956 tg_pt_gp->tg_pt_gp_id,
957 tg_pt_gp->tg_pt_gp_alua_pending_state,
958 tg_pt_gp->tg_pt_gp_alua_access_status);
959
960 snprintf(path, ALUA_METADATA_PATH_LEN,
961 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
962 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
963
964 rc = core_alua_write_tpg_metadata(path, md_buf, len);
965 kfree(md_buf);
966 return rc;
967 }
968
969 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
970 {
971 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
972 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
973 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
974 struct se_dev_entry *se_deve;
975 struct se_lun_acl *lacl;
976 struct se_port *port;
977 struct t10_alua_tg_pt_gp_member *mem;
978 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
979 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
980
981 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
982 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
983 tg_pt_gp_mem_list) {
984 port = mem->tg_pt;
985 /*
986 * After an implicit target port asymmetric access state
987 * change, a device server shall establish a unit attention
988 * condition for the initiator port associated with every I_T
989 * nexus with the additional sense code set to ASYMMETRIC
990 * ACCESS STATE CHANGED.
991 *
992 * After an explicit target port asymmetric access state
993 * change, a device server shall establish a unit attention
994 * condition with the additional sense code set to ASYMMETRIC
995 * ACCESS STATE CHANGED for the initiator port associated with
996 * every I_T nexus other than the I_T nexus on which the SET
997 * TARGET PORT GROUPS command
998 */
999 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
1000 smp_mb__after_atomic_inc();
1001 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1002
1003 spin_lock_bh(&port->sep_alua_lock);
1004 list_for_each_entry(se_deve, &port->sep_alua_list,
1005 alua_port_list) {
1006 lacl = se_deve->se_lun_acl;
1007 /*
1008 * se_deve->se_lun_acl pointer may be NULL for a
1009 * entry created without explicit Node+MappedLUN ACLs
1010 */
1011 if (!lacl)
1012 continue;
1013
1014 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1015 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1016 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1017 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1018 (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1019 (tg_pt_gp->tg_pt_gp_alua_port == port))
1020 continue;
1021
1022 core_scsi3_ua_allocate(lacl->se_lun_nacl,
1023 se_deve->mapped_lun, 0x2A,
1024 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1025 }
1026 spin_unlock_bh(&port->sep_alua_lock);
1027
1028 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1029 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
1030 smp_mb__after_atomic_dec();
1031 }
1032 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1033 /*
1034 * Update the ALUA metadata buf that has been allocated in
1035 * core_alua_do_port_transition(), this metadata will be written
1036 * to struct file.
1037 *
1038 * Note that there is the case where we do not want to update the
1039 * metadata when the saved metadata is being parsed in userspace
1040 * when setting the existing port access state and access status.
1041 *
1042 * Also note that the failure to write out the ALUA metadata to
1043 * struct file does NOT affect the actual ALUA transition.
1044 */
1045 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1046 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1047 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1048 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1049 }
1050 /*
1051 * Set the current primary ALUA access state to the requested new state
1052 */
1053 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1054 tg_pt_gp->tg_pt_gp_alua_pending_state);
1055
1056 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1057 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1058 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1059 tg_pt_gp->tg_pt_gp_id,
1060 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1061 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1062 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1063 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1064 smp_mb__after_atomic_dec();
1065 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1066
1067 if (tg_pt_gp->tg_pt_gp_transition_complete)
1068 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1069 }
1070
1071 static int core_alua_do_transition_tg_pt(
1072 struct t10_alua_tg_pt_gp *tg_pt_gp,
1073 int new_state,
1074 int explicit)
1075 {
1076 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1077 DECLARE_COMPLETION_ONSTACK(wait);
1078
1079 /* Nothing to be done here */
1080 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1081 return 0;
1082
1083 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1084 return -EAGAIN;
1085
1086 /*
1087 * Flush any pending transitions
1088 */
1089 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1090 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1091 ALUA_ACCESS_STATE_TRANSITION) {
1092 /* Just in case */
1093 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1094 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1095 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1096 wait_for_completion(&wait);
1097 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1098 return 0;
1099 }
1100
1101 /*
1102 * Save the old primary ALUA access state, and set the current state
1103 * to ALUA_ACCESS_STATE_TRANSITION.
1104 */
1105 tg_pt_gp->tg_pt_gp_alua_previous_state =
1106 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1107 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1108
1109 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1110 ALUA_ACCESS_STATE_TRANSITION);
1111 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1112 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1113 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1114
1115 /*
1116 * Check for the optional ALUA primary state transition delay
1117 */
1118 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1119 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1120
1121 /*
1122 * Take a reference for workqueue item
1123 */
1124 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1125 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1126 smp_mb__after_atomic_inc();
1127 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1128
1129 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1130 unsigned long transition_tmo;
1131
1132 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1133 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1134 &tg_pt_gp->tg_pt_gp_transition_work,
1135 transition_tmo);
1136 } else {
1137 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1138 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1139 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1140 wait_for_completion(&wait);
1141 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1142 }
1143
1144 return 0;
1145 }
1146
1147 int core_alua_do_port_transition(
1148 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1149 struct se_device *l_dev,
1150 struct se_port *l_port,
1151 struct se_node_acl *l_nacl,
1152 int new_state,
1153 int explicit)
1154 {
1155 struct se_device *dev;
1156 struct t10_alua_lu_gp *lu_gp;
1157 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1158 struct t10_alua_tg_pt_gp *tg_pt_gp;
1159 int primary, valid_states, rc = 0;
1160
1161 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1162 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1163 return -EINVAL;
1164
1165 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1166 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1167 lu_gp = local_lu_gp_mem->lu_gp;
1168 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1169 smp_mb__after_atomic_inc();
1170 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1171 /*
1172 * For storage objects that are members of the 'default_lu_gp',
1173 * we only do transition on the passed *l_tp_pt_gp, and not
1174 * on all of the matching target port groups IDs in default_lu_gp.
1175 */
1176 if (!lu_gp->lu_gp_id) {
1177 /*
1178 * core_alua_do_transition_tg_pt() will always return
1179 * success.
1180 */
1181 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1182 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1183 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1184 new_state, explicit);
1185 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1186 smp_mb__after_atomic_dec();
1187 return rc;
1188 }
1189 /*
1190 * For all other LU groups aside from 'default_lu_gp', walk all of
1191 * the associated storage objects looking for a matching target port
1192 * group ID from the local target port group.
1193 */
1194 spin_lock(&lu_gp->lu_gp_lock);
1195 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1196 lu_gp_mem_list) {
1197
1198 dev = lu_gp_mem->lu_gp_mem_dev;
1199 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
1200 smp_mb__after_atomic_inc();
1201 spin_unlock(&lu_gp->lu_gp_lock);
1202
1203 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1204 list_for_each_entry(tg_pt_gp,
1205 &dev->t10_alua.tg_pt_gps_list,
1206 tg_pt_gp_list) {
1207
1208 if (!tg_pt_gp->tg_pt_gp_valid_id)
1209 continue;
1210 /*
1211 * If the target behavior port asymmetric access state
1212 * is changed for any target port group accessible via
1213 * a logical unit within a LU group, the target port
1214 * behavior group asymmetric access states for the same
1215 * target port group accessible via other logical units
1216 * in that LU group will also change.
1217 */
1218 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1219 continue;
1220
1221 if (l_tg_pt_gp == tg_pt_gp) {
1222 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1223 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1224 } else {
1225 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1226 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1227 }
1228 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1229 smp_mb__after_atomic_inc();
1230 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1231 /*
1232 * core_alua_do_transition_tg_pt() will always return
1233 * success.
1234 */
1235 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1236 new_state, explicit);
1237
1238 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1239 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1240 smp_mb__after_atomic_dec();
1241 if (rc)
1242 break;
1243 }
1244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1245
1246 spin_lock(&lu_gp->lu_gp_lock);
1247 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
1248 smp_mb__after_atomic_dec();
1249 }
1250 spin_unlock(&lu_gp->lu_gp_lock);
1251
1252 if (!rc) {
1253 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1254 " Group IDs: %hu %s transition to primary state: %s\n",
1255 config_item_name(&lu_gp->lu_gp_group.cg_item),
1256 l_tg_pt_gp->tg_pt_gp_id,
1257 (explicit) ? "explicit" : "implicit",
1258 core_alua_dump_state(new_state));
1259 }
1260
1261 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1262 smp_mb__after_atomic_dec();
1263 return rc;
1264 }
1265
1266 /*
1267 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1268 */
1269 static int core_alua_update_tpg_secondary_metadata(
1270 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1271 struct se_port *port)
1272 {
1273 unsigned char *md_buf;
1274 struct se_portal_group *se_tpg = port->sep_tpg;
1275 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1276 int len, rc;
1277
1278 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1279 if (!md_buf) {
1280 pr_err("Unable to allocate buf for ALUA metadata\n");
1281 return -ENOMEM;
1282 }
1283
1284 memset(path, 0, ALUA_METADATA_PATH_LEN);
1285 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1286
1287 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1288 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1289
1290 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1291 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1292 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1293
1294 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1295 "alua_tg_pt_status=0x%02x\n",
1296 atomic_read(&port->sep_tg_pt_secondary_offline),
1297 port->sep_tg_pt_secondary_stat);
1298
1299 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1300 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1301 port->sep_lun->unpacked_lun);
1302
1303 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1304 kfree(md_buf);
1305
1306 return rc;
1307 }
1308
1309 static int core_alua_set_tg_pt_secondary_state(
1310 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1311 struct se_port *port,
1312 int explicit,
1313 int offline)
1314 {
1315 struct t10_alua_tg_pt_gp *tg_pt_gp;
1316 int trans_delay_msecs;
1317
1318 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1319 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1320 if (!tg_pt_gp) {
1321 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1322 pr_err("Unable to complete secondary state"
1323 " transition\n");
1324 return -EINVAL;
1325 }
1326 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1327 /*
1328 * Set the secondary ALUA target port access state to OFFLINE
1329 * or release the previously secondary state for struct se_port
1330 */
1331 if (offline)
1332 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1333 else
1334 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1335
1336 port->sep_tg_pt_secondary_stat = (explicit) ?
1337 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1338 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1339
1340 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1341 " to secondary access state: %s\n", (explicit) ? "explicit" :
1342 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1343 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1344
1345 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1346 /*
1347 * Do the optional transition delay after we set the secondary
1348 * ALUA access state.
1349 */
1350 if (trans_delay_msecs != 0)
1351 msleep_interruptible(trans_delay_msecs);
1352 /*
1353 * See if we need to update the ALUA fabric port metadata for
1354 * secondary state and status
1355 */
1356 if (port->sep_tg_pt_secondary_write_md) {
1357 mutex_lock(&port->sep_tg_pt_md_mutex);
1358 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1359 mutex_unlock(&port->sep_tg_pt_md_mutex);
1360 }
1361
1362 return 0;
1363 }
1364
1365 struct t10_alua_lba_map *
1366 core_alua_allocate_lba_map(struct list_head *list,
1367 u64 first_lba, u64 last_lba)
1368 {
1369 struct t10_alua_lba_map *lba_map;
1370
1371 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1372 if (!lba_map) {
1373 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1374 return ERR_PTR(-ENOMEM);
1375 }
1376 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1377 lba_map->lba_map_first_lba = first_lba;
1378 lba_map->lba_map_last_lba = last_lba;
1379
1380 list_add_tail(&lba_map->lba_map_list, list);
1381 return lba_map;
1382 }
1383
1384 int
1385 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1386 int pg_id, int state)
1387 {
1388 struct t10_alua_lba_map_member *lba_map_mem;
1389
1390 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1391 lba_map_mem_list) {
1392 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1393 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1394 return -EINVAL;
1395 }
1396 }
1397
1398 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1399 if (!lba_map_mem) {
1400 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1401 return -ENOMEM;
1402 }
1403 lba_map_mem->lba_map_mem_alua_state = state;
1404 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1405
1406 list_add_tail(&lba_map_mem->lba_map_mem_list,
1407 &lba_map->lba_map_mem_list);
1408 return 0;
1409 }
1410
1411 void
1412 core_alua_free_lba_map(struct list_head *lba_list)
1413 {
1414 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1415 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1416
1417 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1418 lba_map_list) {
1419 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1420 &lba_map->lba_map_mem_list,
1421 lba_map_mem_list) {
1422 list_del(&lba_map_mem->lba_map_mem_list);
1423 kmem_cache_free(t10_alua_lba_map_mem_cache,
1424 lba_map_mem);
1425 }
1426 list_del(&lba_map->lba_map_list);
1427 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1428 }
1429 }
1430
1431 void
1432 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1433 int segment_size, int segment_mult)
1434 {
1435 struct list_head old_lba_map_list;
1436 struct t10_alua_tg_pt_gp *tg_pt_gp;
1437 int activate = 0, supported;
1438
1439 INIT_LIST_HEAD(&old_lba_map_list);
1440 spin_lock(&dev->t10_alua.lba_map_lock);
1441 dev->t10_alua.lba_map_segment_size = segment_size;
1442 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1443 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1444 if (lba_map_list) {
1445 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1446 activate = 1;
1447 }
1448 spin_unlock(&dev->t10_alua.lba_map_lock);
1449 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1450 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1451 tg_pt_gp_list) {
1452
1453 if (!tg_pt_gp->tg_pt_gp_valid_id)
1454 continue;
1455 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1456 if (activate)
1457 supported |= ALUA_LBD_SUP;
1458 else
1459 supported &= ~ALUA_LBD_SUP;
1460 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1461 }
1462 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1463 core_alua_free_lba_map(&old_lba_map_list);
1464 }
1465
1466 struct t10_alua_lu_gp *
1467 core_alua_allocate_lu_gp(const char *name, int def_group)
1468 {
1469 struct t10_alua_lu_gp *lu_gp;
1470
1471 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1472 if (!lu_gp) {
1473 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1474 return ERR_PTR(-ENOMEM);
1475 }
1476 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1477 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1478 spin_lock_init(&lu_gp->lu_gp_lock);
1479 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1480
1481 if (def_group) {
1482 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1483 lu_gp->lu_gp_valid_id = 1;
1484 alua_lu_gps_count++;
1485 }
1486
1487 return lu_gp;
1488 }
1489
1490 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1491 {
1492 struct t10_alua_lu_gp *lu_gp_tmp;
1493 u16 lu_gp_id_tmp;
1494 /*
1495 * The lu_gp->lu_gp_id may only be set once..
1496 */
1497 if (lu_gp->lu_gp_valid_id) {
1498 pr_warn("ALUA LU Group already has a valid ID,"
1499 " ignoring request\n");
1500 return -EINVAL;
1501 }
1502
1503 spin_lock(&lu_gps_lock);
1504 if (alua_lu_gps_count == 0x0000ffff) {
1505 pr_err("Maximum ALUA alua_lu_gps_count:"
1506 " 0x0000ffff reached\n");
1507 spin_unlock(&lu_gps_lock);
1508 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1509 return -ENOSPC;
1510 }
1511 again:
1512 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1513 alua_lu_gps_counter++;
1514
1515 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1516 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1517 if (!lu_gp_id)
1518 goto again;
1519
1520 pr_warn("ALUA Logical Unit Group ID: %hu"
1521 " already exists, ignoring request\n",
1522 lu_gp_id);
1523 spin_unlock(&lu_gps_lock);
1524 return -EINVAL;
1525 }
1526 }
1527
1528 lu_gp->lu_gp_id = lu_gp_id_tmp;
1529 lu_gp->lu_gp_valid_id = 1;
1530 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1531 alua_lu_gps_count++;
1532 spin_unlock(&lu_gps_lock);
1533
1534 return 0;
1535 }
1536
1537 static struct t10_alua_lu_gp_member *
1538 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1539 {
1540 struct t10_alua_lu_gp_member *lu_gp_mem;
1541
1542 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1543 if (!lu_gp_mem) {
1544 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1545 return ERR_PTR(-ENOMEM);
1546 }
1547 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1548 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1549 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1550
1551 lu_gp_mem->lu_gp_mem_dev = dev;
1552 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1553
1554 return lu_gp_mem;
1555 }
1556
1557 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1558 {
1559 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1560 /*
1561 * Once we have reached this point, config_item_put() has
1562 * already been called from target_core_alua_drop_lu_gp().
1563 *
1564 * Here, we remove the *lu_gp from the global list so that
1565 * no associations can be made while we are releasing
1566 * struct t10_alua_lu_gp.
1567 */
1568 spin_lock(&lu_gps_lock);
1569 list_del(&lu_gp->lu_gp_node);
1570 alua_lu_gps_count--;
1571 spin_unlock(&lu_gps_lock);
1572 /*
1573 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1574 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1575 * released with core_alua_put_lu_gp_from_name()
1576 */
1577 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1578 cpu_relax();
1579 /*
1580 * Release reference to struct t10_alua_lu_gp * from all associated
1581 * struct se_device.
1582 */
1583 spin_lock(&lu_gp->lu_gp_lock);
1584 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1585 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1586 if (lu_gp_mem->lu_gp_assoc) {
1587 list_del(&lu_gp_mem->lu_gp_mem_list);
1588 lu_gp->lu_gp_members--;
1589 lu_gp_mem->lu_gp_assoc = 0;
1590 }
1591 spin_unlock(&lu_gp->lu_gp_lock);
1592 /*
1593 *
1594 * lu_gp_mem is associated with a single
1595 * struct se_device->dev_alua_lu_gp_mem, and is released when
1596 * struct se_device is released via core_alua_free_lu_gp_mem().
1597 *
1598 * If the passed lu_gp does NOT match the default_lu_gp, assume
1599 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1600 */
1601 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1602 if (lu_gp != default_lu_gp)
1603 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1604 default_lu_gp);
1605 else
1606 lu_gp_mem->lu_gp = NULL;
1607 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1608
1609 spin_lock(&lu_gp->lu_gp_lock);
1610 }
1611 spin_unlock(&lu_gp->lu_gp_lock);
1612
1613 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1614 }
1615
1616 void core_alua_free_lu_gp_mem(struct se_device *dev)
1617 {
1618 struct t10_alua_lu_gp *lu_gp;
1619 struct t10_alua_lu_gp_member *lu_gp_mem;
1620
1621 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1622 if (!lu_gp_mem)
1623 return;
1624
1625 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1626 cpu_relax();
1627
1628 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1629 lu_gp = lu_gp_mem->lu_gp;
1630 if (lu_gp) {
1631 spin_lock(&lu_gp->lu_gp_lock);
1632 if (lu_gp_mem->lu_gp_assoc) {
1633 list_del(&lu_gp_mem->lu_gp_mem_list);
1634 lu_gp->lu_gp_members--;
1635 lu_gp_mem->lu_gp_assoc = 0;
1636 }
1637 spin_unlock(&lu_gp->lu_gp_lock);
1638 lu_gp_mem->lu_gp = NULL;
1639 }
1640 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1641
1642 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1643 }
1644
1645 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1646 {
1647 struct t10_alua_lu_gp *lu_gp;
1648 struct config_item *ci;
1649
1650 spin_lock(&lu_gps_lock);
1651 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1652 if (!lu_gp->lu_gp_valid_id)
1653 continue;
1654 ci = &lu_gp->lu_gp_group.cg_item;
1655 if (!strcmp(config_item_name(ci), name)) {
1656 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1657 spin_unlock(&lu_gps_lock);
1658 return lu_gp;
1659 }
1660 }
1661 spin_unlock(&lu_gps_lock);
1662
1663 return NULL;
1664 }
1665
1666 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1667 {
1668 spin_lock(&lu_gps_lock);
1669 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1670 spin_unlock(&lu_gps_lock);
1671 }
1672
1673 /*
1674 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1675 */
1676 void __core_alua_attach_lu_gp_mem(
1677 struct t10_alua_lu_gp_member *lu_gp_mem,
1678 struct t10_alua_lu_gp *lu_gp)
1679 {
1680 spin_lock(&lu_gp->lu_gp_lock);
1681 lu_gp_mem->lu_gp = lu_gp;
1682 lu_gp_mem->lu_gp_assoc = 1;
1683 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1684 lu_gp->lu_gp_members++;
1685 spin_unlock(&lu_gp->lu_gp_lock);
1686 }
1687
1688 /*
1689 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1690 */
1691 void __core_alua_drop_lu_gp_mem(
1692 struct t10_alua_lu_gp_member *lu_gp_mem,
1693 struct t10_alua_lu_gp *lu_gp)
1694 {
1695 spin_lock(&lu_gp->lu_gp_lock);
1696 list_del(&lu_gp_mem->lu_gp_mem_list);
1697 lu_gp_mem->lu_gp = NULL;
1698 lu_gp_mem->lu_gp_assoc = 0;
1699 lu_gp->lu_gp_members--;
1700 spin_unlock(&lu_gp->lu_gp_lock);
1701 }
1702
1703 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1704 const char *name, int def_group)
1705 {
1706 struct t10_alua_tg_pt_gp *tg_pt_gp;
1707
1708 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1709 if (!tg_pt_gp) {
1710 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1711 return NULL;
1712 }
1713 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1714 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1715 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1716 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1717 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1718 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1719 core_alua_do_transition_tg_pt_work);
1720 tg_pt_gp->tg_pt_gp_dev = dev;
1721 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1722 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1723 /*
1724 * Enable both explicit and implicit ALUA support by default
1725 */
1726 tg_pt_gp->tg_pt_gp_alua_access_type =
1727 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1728 /*
1729 * Set the default Active/NonOptimized Delay in milliseconds
1730 */
1731 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1732 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1733 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1734
1735 /*
1736 * Enable all supported states
1737 */
1738 tg_pt_gp->tg_pt_gp_alua_supported_states =
1739 ALUA_T_SUP | ALUA_O_SUP |
1740 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1741
1742 if (def_group) {
1743 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1744 tg_pt_gp->tg_pt_gp_id =
1745 dev->t10_alua.alua_tg_pt_gps_counter++;
1746 tg_pt_gp->tg_pt_gp_valid_id = 1;
1747 dev->t10_alua.alua_tg_pt_gps_count++;
1748 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1749 &dev->t10_alua.tg_pt_gps_list);
1750 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1751 }
1752
1753 return tg_pt_gp;
1754 }
1755
1756 int core_alua_set_tg_pt_gp_id(
1757 struct t10_alua_tg_pt_gp *tg_pt_gp,
1758 u16 tg_pt_gp_id)
1759 {
1760 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1761 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1762 u16 tg_pt_gp_id_tmp;
1763
1764 /*
1765 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1766 */
1767 if (tg_pt_gp->tg_pt_gp_valid_id) {
1768 pr_warn("ALUA TG PT Group already has a valid ID,"
1769 " ignoring request\n");
1770 return -EINVAL;
1771 }
1772
1773 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1774 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1775 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1776 " 0x0000ffff reached\n");
1777 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1778 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1779 return -ENOSPC;
1780 }
1781 again:
1782 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1783 dev->t10_alua.alua_tg_pt_gps_counter++;
1784
1785 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1786 tg_pt_gp_list) {
1787 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1788 if (!tg_pt_gp_id)
1789 goto again;
1790
1791 pr_err("ALUA Target Port Group ID: %hu already"
1792 " exists, ignoring request\n", tg_pt_gp_id);
1793 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1794 return -EINVAL;
1795 }
1796 }
1797
1798 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1799 tg_pt_gp->tg_pt_gp_valid_id = 1;
1800 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1801 &dev->t10_alua.tg_pt_gps_list);
1802 dev->t10_alua.alua_tg_pt_gps_count++;
1803 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1804
1805 return 0;
1806 }
1807
1808 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1809 struct se_port *port)
1810 {
1811 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1812
1813 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1814 GFP_KERNEL);
1815 if (!tg_pt_gp_mem) {
1816 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1817 return ERR_PTR(-ENOMEM);
1818 }
1819 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1820 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1821 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1822
1823 tg_pt_gp_mem->tg_pt = port;
1824 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1825
1826 return tg_pt_gp_mem;
1827 }
1828
1829 void core_alua_free_tg_pt_gp(
1830 struct t10_alua_tg_pt_gp *tg_pt_gp)
1831 {
1832 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1833 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1834
1835 /*
1836 * Once we have reached this point, config_item_put() has already
1837 * been called from target_core_alua_drop_tg_pt_gp().
1838 *
1839 * Here we remove *tg_pt_gp from the global list so that
1840 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1841 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1842 */
1843 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1844 list_del(&tg_pt_gp->tg_pt_gp_list);
1845 dev->t10_alua.alua_tg_pt_gps_counter--;
1846 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1847
1848 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1849
1850 /*
1851 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1852 * core_alua_get_tg_pt_gp_by_name() in
1853 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1854 * to be released with core_alua_put_tg_pt_gp_from_name().
1855 */
1856 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1857 cpu_relax();
1858
1859 /*
1860 * Release reference to struct t10_alua_tg_pt_gp from all associated
1861 * struct se_port.
1862 */
1863 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1864 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1865 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1866 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1867 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1868 tg_pt_gp->tg_pt_gp_members--;
1869 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1870 }
1871 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1872 /*
1873 * tg_pt_gp_mem is associated with a single
1874 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1875 * core_alua_free_tg_pt_gp_mem().
1876 *
1877 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1878 * assume we want to re-associate a given tg_pt_gp_mem with
1879 * default_tg_pt_gp.
1880 */
1881 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1882 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1883 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1884 dev->t10_alua.default_tg_pt_gp);
1885 } else
1886 tg_pt_gp_mem->tg_pt_gp = NULL;
1887 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1888
1889 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1890 }
1891 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1892
1893 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1894 }
1895
1896 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1897 {
1898 struct t10_alua_tg_pt_gp *tg_pt_gp;
1899 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1900
1901 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1902 if (!tg_pt_gp_mem)
1903 return;
1904
1905 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1906 cpu_relax();
1907
1908 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1909 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1910 if (tg_pt_gp) {
1911 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1912 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1913 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1914 tg_pt_gp->tg_pt_gp_members--;
1915 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1916 }
1917 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1918 tg_pt_gp_mem->tg_pt_gp = NULL;
1919 }
1920 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1921
1922 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1923 }
1924
1925 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1926 struct se_device *dev, const char *name)
1927 {
1928 struct t10_alua_tg_pt_gp *tg_pt_gp;
1929 struct config_item *ci;
1930
1931 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1932 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1933 tg_pt_gp_list) {
1934 if (!tg_pt_gp->tg_pt_gp_valid_id)
1935 continue;
1936 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1937 if (!strcmp(config_item_name(ci), name)) {
1938 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1939 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1940 return tg_pt_gp;
1941 }
1942 }
1943 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1944
1945 return NULL;
1946 }
1947
1948 static void core_alua_put_tg_pt_gp_from_name(
1949 struct t10_alua_tg_pt_gp *tg_pt_gp)
1950 {
1951 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1952
1953 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1954 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1955 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1956 }
1957
1958 /*
1959 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1960 */
1961 void __core_alua_attach_tg_pt_gp_mem(
1962 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1963 struct t10_alua_tg_pt_gp *tg_pt_gp)
1964 {
1965 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1966 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1967 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1968 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1969 &tg_pt_gp->tg_pt_gp_mem_list);
1970 tg_pt_gp->tg_pt_gp_members++;
1971 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1972 }
1973
1974 /*
1975 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1976 */
1977 static void __core_alua_drop_tg_pt_gp_mem(
1978 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1979 struct t10_alua_tg_pt_gp *tg_pt_gp)
1980 {
1981 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1982 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1983 tg_pt_gp_mem->tg_pt_gp = NULL;
1984 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1985 tg_pt_gp->tg_pt_gp_members--;
1986 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1987 }
1988
1989 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1990 {
1991 struct config_item *tg_pt_ci;
1992 struct t10_alua_tg_pt_gp *tg_pt_gp;
1993 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1994 ssize_t len = 0;
1995
1996 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1997 if (!tg_pt_gp_mem)
1998 return len;
1999
2000 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2001 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2002 if (tg_pt_gp) {
2003 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
2004 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
2005 " %hu\nTG Port Primary Access State: %s\nTG Port "
2006 "Primary Access Status: %s\nTG Port Secondary Access"
2007 " State: %s\nTG Port Secondary Access Status: %s\n",
2008 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
2009 core_alua_dump_state(atomic_read(
2010 &tg_pt_gp->tg_pt_gp_alua_access_state)),
2011 core_alua_dump_status(
2012 tg_pt_gp->tg_pt_gp_alua_access_status),
2013 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2014 "Offline" : "None",
2015 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2016 }
2017 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2018
2019 return len;
2020 }
2021
2022 ssize_t core_alua_store_tg_pt_gp_info(
2023 struct se_port *port,
2024 const char *page,
2025 size_t count)
2026 {
2027 struct se_portal_group *tpg;
2028 struct se_lun *lun;
2029 struct se_device *dev = port->sep_lun->lun_se_dev;
2030 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2031 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2032 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2033 int move = 0;
2034
2035 tpg = port->sep_tpg;
2036 lun = port->sep_lun;
2037
2038 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2039 if (!tg_pt_gp_mem)
2040 return 0;
2041
2042 if (count > TG_PT_GROUP_NAME_BUF) {
2043 pr_err("ALUA Target Port Group alias too large!\n");
2044 return -EINVAL;
2045 }
2046 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2047 memcpy(buf, page, count);
2048 /*
2049 * Any ALUA target port group alias besides "NULL" means we will be
2050 * making a new group association.
2051 */
2052 if (strcmp(strstrip(buf), "NULL")) {
2053 /*
2054 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2055 * struct t10_alua_tg_pt_gp. This reference is released with
2056 * core_alua_put_tg_pt_gp_from_name() below.
2057 */
2058 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2059 strstrip(buf));
2060 if (!tg_pt_gp_new)
2061 return -ENODEV;
2062 }
2063
2064 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2065 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2066 if (tg_pt_gp) {
2067 /*
2068 * Clearing an existing tg_pt_gp association, and replacing
2069 * with the default_tg_pt_gp.
2070 */
2071 if (!tg_pt_gp_new) {
2072 pr_debug("Target_Core_ConfigFS: Moving"
2073 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2074 " alua/%s, ID: %hu back to"
2075 " default_tg_pt_gp\n",
2076 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2077 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2078 config_item_name(&lun->lun_group.cg_item),
2079 config_item_name(
2080 &tg_pt_gp->tg_pt_gp_group.cg_item),
2081 tg_pt_gp->tg_pt_gp_id);
2082
2083 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2084 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2085 dev->t10_alua.default_tg_pt_gp);
2086 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2087
2088 return count;
2089 }
2090 /*
2091 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2092 */
2093 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2094 move = 1;
2095 }
2096 /*
2097 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2098 */
2099 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2100 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2101 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2102 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2103 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2104 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2105 config_item_name(&lun->lun_group.cg_item),
2106 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2107 tg_pt_gp_new->tg_pt_gp_id);
2108
2109 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2110 return count;
2111 }
2112
2113 ssize_t core_alua_show_access_type(
2114 struct t10_alua_tg_pt_gp *tg_pt_gp,
2115 char *page)
2116 {
2117 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2118 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2119 return sprintf(page, "Implicit and Explicit\n");
2120 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2121 return sprintf(page, "Implicit\n");
2122 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2123 return sprintf(page, "Explicit\n");
2124 else
2125 return sprintf(page, "None\n");
2126 }
2127
2128 ssize_t core_alua_store_access_type(
2129 struct t10_alua_tg_pt_gp *tg_pt_gp,
2130 const char *page,
2131 size_t count)
2132 {
2133 unsigned long tmp;
2134 int ret;
2135
2136 ret = kstrtoul(page, 0, &tmp);
2137 if (ret < 0) {
2138 pr_err("Unable to extract alua_access_type\n");
2139 return ret;
2140 }
2141 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2142 pr_err("Illegal value for alua_access_type:"
2143 " %lu\n", tmp);
2144 return -EINVAL;
2145 }
2146 if (tmp == 3)
2147 tg_pt_gp->tg_pt_gp_alua_access_type =
2148 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2149 else if (tmp == 2)
2150 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2151 else if (tmp == 1)
2152 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2153 else
2154 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2155
2156 return count;
2157 }
2158
2159 ssize_t core_alua_show_nonop_delay_msecs(
2160 struct t10_alua_tg_pt_gp *tg_pt_gp,
2161 char *page)
2162 {
2163 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2164 }
2165
2166 ssize_t core_alua_store_nonop_delay_msecs(
2167 struct t10_alua_tg_pt_gp *tg_pt_gp,
2168 const char *page,
2169 size_t count)
2170 {
2171 unsigned long tmp;
2172 int ret;
2173
2174 ret = kstrtoul(page, 0, &tmp);
2175 if (ret < 0) {
2176 pr_err("Unable to extract nonop_delay_msecs\n");
2177 return ret;
2178 }
2179 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2180 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2181 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2182 ALUA_MAX_NONOP_DELAY_MSECS);
2183 return -EINVAL;
2184 }
2185 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2186
2187 return count;
2188 }
2189
2190 ssize_t core_alua_show_trans_delay_msecs(
2191 struct t10_alua_tg_pt_gp *tg_pt_gp,
2192 char *page)
2193 {
2194 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2195 }
2196
2197 ssize_t core_alua_store_trans_delay_msecs(
2198 struct t10_alua_tg_pt_gp *tg_pt_gp,
2199 const char *page,
2200 size_t count)
2201 {
2202 unsigned long tmp;
2203 int ret;
2204
2205 ret = kstrtoul(page, 0, &tmp);
2206 if (ret < 0) {
2207 pr_err("Unable to extract trans_delay_msecs\n");
2208 return ret;
2209 }
2210 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2211 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2212 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2213 ALUA_MAX_TRANS_DELAY_MSECS);
2214 return -EINVAL;
2215 }
2216 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2217
2218 return count;
2219 }
2220
2221 ssize_t core_alua_show_implicit_trans_secs(
2222 struct t10_alua_tg_pt_gp *tg_pt_gp,
2223 char *page)
2224 {
2225 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2226 }
2227
2228 ssize_t core_alua_store_implicit_trans_secs(
2229 struct t10_alua_tg_pt_gp *tg_pt_gp,
2230 const char *page,
2231 size_t count)
2232 {
2233 unsigned long tmp;
2234 int ret;
2235
2236 ret = kstrtoul(page, 0, &tmp);
2237 if (ret < 0) {
2238 pr_err("Unable to extract implicit_trans_secs\n");
2239 return ret;
2240 }
2241 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2242 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2243 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2244 ALUA_MAX_IMPLICIT_TRANS_SECS);
2245 return -EINVAL;
2246 }
2247 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2248
2249 return count;
2250 }
2251
2252 ssize_t core_alua_show_preferred_bit(
2253 struct t10_alua_tg_pt_gp *tg_pt_gp,
2254 char *page)
2255 {
2256 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2257 }
2258
2259 ssize_t core_alua_store_preferred_bit(
2260 struct t10_alua_tg_pt_gp *tg_pt_gp,
2261 const char *page,
2262 size_t count)
2263 {
2264 unsigned long tmp;
2265 int ret;
2266
2267 ret = kstrtoul(page, 0, &tmp);
2268 if (ret < 0) {
2269 pr_err("Unable to extract preferred ALUA value\n");
2270 return ret;
2271 }
2272 if ((tmp != 0) && (tmp != 1)) {
2273 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2274 return -EINVAL;
2275 }
2276 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2277
2278 return count;
2279 }
2280
2281 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2282 {
2283 if (!lun->lun_sep)
2284 return -ENODEV;
2285
2286 return sprintf(page, "%d\n",
2287 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2288 }
2289
2290 ssize_t core_alua_store_offline_bit(
2291 struct se_lun *lun,
2292 const char *page,
2293 size_t count)
2294 {
2295 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2296 unsigned long tmp;
2297 int ret;
2298
2299 if (!lun->lun_sep)
2300 return -ENODEV;
2301
2302 ret = kstrtoul(page, 0, &tmp);
2303 if (ret < 0) {
2304 pr_err("Unable to extract alua_tg_pt_offline value\n");
2305 return ret;
2306 }
2307 if ((tmp != 0) && (tmp != 1)) {
2308 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2309 tmp);
2310 return -EINVAL;
2311 }
2312 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2313 if (!tg_pt_gp_mem) {
2314 pr_err("Unable to locate *tg_pt_gp_mem\n");
2315 return -EINVAL;
2316 }
2317
2318 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2319 lun->lun_sep, 0, (int)tmp);
2320 if (ret < 0)
2321 return -EINVAL;
2322
2323 return count;
2324 }
2325
2326 ssize_t core_alua_show_secondary_status(
2327 struct se_lun *lun,
2328 char *page)
2329 {
2330 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2331 }
2332
2333 ssize_t core_alua_store_secondary_status(
2334 struct se_lun *lun,
2335 const char *page,
2336 size_t count)
2337 {
2338 unsigned long tmp;
2339 int ret;
2340
2341 ret = kstrtoul(page, 0, &tmp);
2342 if (ret < 0) {
2343 pr_err("Unable to extract alua_tg_pt_status\n");
2344 return ret;
2345 }
2346 if ((tmp != ALUA_STATUS_NONE) &&
2347 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2348 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2349 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2350 tmp);
2351 return -EINVAL;
2352 }
2353 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2354
2355 return count;
2356 }
2357
2358 ssize_t core_alua_show_secondary_write_metadata(
2359 struct se_lun *lun,
2360 char *page)
2361 {
2362 return sprintf(page, "%d\n",
2363 lun->lun_sep->sep_tg_pt_secondary_write_md);
2364 }
2365
2366 ssize_t core_alua_store_secondary_write_metadata(
2367 struct se_lun *lun,
2368 const char *page,
2369 size_t count)
2370 {
2371 unsigned long tmp;
2372 int ret;
2373
2374 ret = kstrtoul(page, 0, &tmp);
2375 if (ret < 0) {
2376 pr_err("Unable to extract alua_tg_pt_write_md\n");
2377 return ret;
2378 }
2379 if ((tmp != 0) && (tmp != 1)) {
2380 pr_err("Illegal value for alua_tg_pt_write_md:"
2381 " %lu\n", tmp);
2382 return -EINVAL;
2383 }
2384 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2385
2386 return count;
2387 }
2388
2389 int core_setup_alua(struct se_device *dev)
2390 {
2391 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2392 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2393 struct t10_alua_lu_gp_member *lu_gp_mem;
2394
2395 /*
2396 * Associate this struct se_device with the default ALUA
2397 * LUN Group.
2398 */
2399 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2400 if (IS_ERR(lu_gp_mem))
2401 return PTR_ERR(lu_gp_mem);
2402
2403 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2404 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2405 default_lu_gp);
2406 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2407
2408 pr_debug("%s: Adding to default ALUA LU Group:"
2409 " core/alua/lu_gps/default_lu_gp\n",
2410 dev->transport->name);
2411 }
2412
2413 return 0;
2414 }
Linux kernel - Deliverables
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