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target: Convert se_node_acl->device_list[] to RCU hlist
[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
39 #include "target_core_internal.h"
40 #include "target_core_alua.h"
41 #include "target_core_ua.h"
42
43 static sense_reason_t core_alua_check_transition(int state, int valid,
44 int *primary);
45 static int core_alua_set_tg_pt_secondary_state(
46 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
47 struct se_port *port, int explicit, int offline);
48
49 static char *core_alua_dump_state(int state);
50
51 static u16 alua_lu_gps_counter;
52 static u32 alua_lu_gps_count;
53
54 static DEFINE_SPINLOCK(lu_gps_lock);
55 static LIST_HEAD(lu_gps_list);
56
57 struct t10_alua_lu_gp *default_lu_gp;
58
59 /*
60 * REPORT REFERRALS
61 *
62 * See sbc3r35 section 5.23
63 */
64 sense_reason_t
65 target_emulate_report_referrals(struct se_cmd *cmd)
66 {
67 struct se_device *dev = cmd->se_dev;
68 struct t10_alua_lba_map *map;
69 struct t10_alua_lba_map_member *map_mem;
70 unsigned char *buf;
71 u32 rd_len = 0, off;
72
73 if (cmd->data_length < 4) {
74 pr_warn("REPORT REFERRALS allocation length %u too"
75 " small\n", cmd->data_length);
76 return TCM_INVALID_CDB_FIELD;
77 }
78
79 buf = transport_kmap_data_sg(cmd);
80 if (!buf)
81 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
82
83 off = 4;
84 spin_lock(&dev->t10_alua.lba_map_lock);
85 if (list_empty(&dev->t10_alua.lba_map_list)) {
86 spin_unlock(&dev->t10_alua.lba_map_lock);
87 transport_kunmap_data_sg(cmd);
88
89 return TCM_UNSUPPORTED_SCSI_OPCODE;
90 }
91
92 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
93 lba_map_list) {
94 int desc_num = off + 3;
95 int pg_num;
96
97 off += 4;
98 if (cmd->data_length > off)
99 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
100 off += 8;
101 if (cmd->data_length > off)
102 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
103 off += 8;
104 rd_len += 20;
105 pg_num = 0;
106 list_for_each_entry(map_mem, &map->lba_map_mem_list,
107 lba_map_mem_list) {
108 int alua_state = map_mem->lba_map_mem_alua_state;
109 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
110
111 if (cmd->data_length > off)
112 buf[off] = alua_state & 0x0f;
113 off += 2;
114 if (cmd->data_length > off)
115 buf[off] = (alua_pg_id >> 8) & 0xff;
116 off++;
117 if (cmd->data_length > off)
118 buf[off] = (alua_pg_id & 0xff);
119 off++;
120 rd_len += 4;
121 pg_num++;
122 }
123 if (cmd->data_length > desc_num)
124 buf[desc_num] = pg_num;
125 }
126 spin_unlock(&dev->t10_alua.lba_map_lock);
127
128 /*
129 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
130 */
131 put_unaligned_be16(rd_len, &buf[2]);
132
133 transport_kunmap_data_sg(cmd);
134
135 target_complete_cmd(cmd, GOOD);
136 return 0;
137 }
138
139 /*
140 * REPORT_TARGET_PORT_GROUPS
141 *
142 * See spc4r17 section 6.27
143 */
144 sense_reason_t
145 target_emulate_report_target_port_groups(struct se_cmd *cmd)
146 {
147 struct se_device *dev = cmd->se_dev;
148 struct se_port *port;
149 struct t10_alua_tg_pt_gp *tg_pt_gp;
150 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
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(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
226 tg_pt_gp_mem_list) {
227 port = tg_pt_gp_mem->tg_pt;
228 /*
229 * Start Target Port descriptor format
230 *
231 * See spc4r17 section 6.2.7 Table 247
232 */
233 off += 2; /* Skip over Obsolete */
234 /*
235 * Set RELATIVE TARGET PORT IDENTIFIER
236 */
237 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
238 buf[off++] = (port->sep_rtpi & 0xff);
239 rd_len += 4;
240 }
241 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
242 }
243 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
244 /*
245 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
246 */
247 put_unaligned_be32(rd_len, &buf[0]);
248
249 /*
250 * Fill in the Extended header parameter data format if requested
251 */
252 if (ext_hdr != 0) {
253 buf[4] = 0x10;
254 /*
255 * Set the implicit transition time (in seconds) for the application
256 * client to use as a base for it's transition timeout value.
257 *
258 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
259 * this CDB was received upon to determine this value individually
260 * for ALUA target port group.
261 */
262 port = cmd->se_lun->lun_sep;
263 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
264 if (tg_pt_gp_mem) {
265 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
266 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
267 if (tg_pt_gp)
268 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
269 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
270 }
271 }
272 transport_kunmap_data_sg(cmd);
273
274 target_complete_cmd(cmd, GOOD);
275 return 0;
276 }
277
278 /*
279 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
280 *
281 * See spc4r17 section 6.35
282 */
283 sense_reason_t
284 target_emulate_set_target_port_groups(struct se_cmd *cmd)
285 {
286 struct se_device *dev = cmd->se_dev;
287 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
288 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
289 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
290 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
291 unsigned char *buf;
292 unsigned char *ptr;
293 sense_reason_t rc = TCM_NO_SENSE;
294 u32 len = 4; /* Skip over RESERVED area in header */
295 int alua_access_state, primary = 0, valid_states;
296 u16 tg_pt_id, rtpi;
297
298 if (!l_port)
299 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
300
301 if (cmd->data_length < 4) {
302 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
303 " small\n", cmd->data_length);
304 return TCM_INVALID_PARAMETER_LIST;
305 }
306
307 buf = transport_kmap_data_sg(cmd);
308 if (!buf)
309 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
310
311 /*
312 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
313 * for the local tg_pt_gp.
314 */
315 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
316 if (!l_tg_pt_gp_mem) {
317 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
318 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
319 goto out;
320 }
321 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
322 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
323 if (!l_tg_pt_gp) {
324 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
325 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
326 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
327 goto out;
328 }
329 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
330
331 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
332 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
333 " while TPGS_EXPLICIT_ALUA is disabled\n");
334 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
335 goto out;
336 }
337 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
338
339 ptr = &buf[4]; /* Skip over RESERVED area in header */
340
341 while (len < cmd->data_length) {
342 bool found = false;
343 alua_access_state = (ptr[0] & 0x0f);
344 /*
345 * Check the received ALUA access state, and determine if
346 * the state is a primary or secondary target port asymmetric
347 * access state.
348 */
349 rc = core_alua_check_transition(alua_access_state,
350 valid_states, &primary);
351 if (rc) {
352 /*
353 * If the SET TARGET PORT GROUPS attempts to establish
354 * an invalid combination of target port asymmetric
355 * access states or attempts to establish an
356 * unsupported target port asymmetric access state,
357 * then the command shall be terminated with CHECK
358 * CONDITION status, with the sense key set to ILLEGAL
359 * REQUEST, and the additional sense code set to INVALID
360 * FIELD IN PARAMETER LIST.
361 */
362 goto out;
363 }
364
365 /*
366 * If the ASYMMETRIC ACCESS STATE field (see table 267)
367 * specifies a primary target port asymmetric access state,
368 * then the TARGET PORT GROUP OR TARGET PORT field specifies
369 * a primary target port group for which the primary target
370 * port asymmetric access state shall be changed. If the
371 * ASYMMETRIC ACCESS STATE field specifies a secondary target
372 * port asymmetric access state, then the TARGET PORT GROUP OR
373 * TARGET PORT field specifies the relative target port
374 * identifier (see 3.1.120) of the target port for which the
375 * secondary target port asymmetric access state shall be
376 * changed.
377 */
378 if (primary) {
379 tg_pt_id = get_unaligned_be16(ptr + 2);
380 /*
381 * Locate the matching target port group ID from
382 * the global tg_pt_gp list
383 */
384 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
385 list_for_each_entry(tg_pt_gp,
386 &dev->t10_alua.tg_pt_gps_list,
387 tg_pt_gp_list) {
388 if (!tg_pt_gp->tg_pt_gp_valid_id)
389 continue;
390
391 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
392 continue;
393
394 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
395
396 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
397
398 if (!core_alua_do_port_transition(tg_pt_gp,
399 dev, l_port, nacl,
400 alua_access_state, 1))
401 found = true;
402
403 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
404 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
405 break;
406 }
407 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
408 } else {
409 /*
410 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
411 * the Target Port in question for the the incoming
412 * SET_TARGET_PORT_GROUPS op.
413 */
414 rtpi = get_unaligned_be16(ptr + 2);
415 /*
416 * Locate the matching relative target port identifier
417 * for the struct se_device storage object.
418 */
419 spin_lock(&dev->se_port_lock);
420 list_for_each_entry(port, &dev->dev_sep_list,
421 sep_list) {
422 if (port->sep_rtpi != rtpi)
423 continue;
424
425 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
426
427 spin_unlock(&dev->se_port_lock);
428
429 if (!core_alua_set_tg_pt_secondary_state(
430 tg_pt_gp_mem, port, 1, 1))
431 found = true;
432
433 spin_lock(&dev->se_port_lock);
434 break;
435 }
436 spin_unlock(&dev->se_port_lock);
437 }
438
439 if (!found) {
440 rc = TCM_INVALID_PARAMETER_LIST;
441 goto out;
442 }
443
444 ptr += 4;
445 len += 4;
446 }
447
448 out:
449 transport_kunmap_data_sg(cmd);
450 if (!rc)
451 target_complete_cmd(cmd, GOOD);
452 return rc;
453 }
454
455 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
456 {
457 /*
458 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
459 * The ALUA additional sense code qualifier (ASCQ) is determined
460 * by the ALUA primary or secondary access state..
461 */
462 pr_debug("[%s]: ALUA TG Port not available, "
463 "SenseKey: NOT_READY, ASC/ASCQ: "
464 "0x04/0x%02x\n",
465 cmd->se_tfo->get_fabric_name(), alua_ascq);
466
467 cmd->scsi_asc = 0x04;
468 cmd->scsi_ascq = alua_ascq;
469 }
470
471 static inline void core_alua_state_nonoptimized(
472 struct se_cmd *cmd,
473 unsigned char *cdb,
474 int nonop_delay_msecs)
475 {
476 /*
477 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
478 * later to determine if processing of this cmd needs to be
479 * temporarily delayed for the Active/NonOptimized primary access state.
480 */
481 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
482 cmd->alua_nonop_delay = nonop_delay_msecs;
483 }
484
485 static inline int core_alua_state_lba_dependent(
486 struct se_cmd *cmd,
487 struct t10_alua_tg_pt_gp *tg_pt_gp)
488 {
489 struct se_device *dev = cmd->se_dev;
490 u64 segment_size, segment_mult, sectors, lba;
491
492 /* Only need to check for cdb actually containing LBAs */
493 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
494 return 0;
495
496 spin_lock(&dev->t10_alua.lba_map_lock);
497 segment_size = dev->t10_alua.lba_map_segment_size;
498 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
499 sectors = cmd->data_length / dev->dev_attrib.block_size;
500
501 lba = cmd->t_task_lba;
502 while (lba < cmd->t_task_lba + sectors) {
503 struct t10_alua_lba_map *cur_map = NULL, *map;
504 struct t10_alua_lba_map_member *map_mem;
505
506 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
507 lba_map_list) {
508 u64 start_lba, last_lba;
509 u64 first_lba = map->lba_map_first_lba;
510
511 if (segment_mult) {
512 u64 tmp = lba;
513 start_lba = do_div(tmp, segment_size * segment_mult);
514
515 last_lba = first_lba + segment_size - 1;
516 if (start_lba >= first_lba &&
517 start_lba <= last_lba) {
518 lba += segment_size;
519 cur_map = map;
520 break;
521 }
522 } else {
523 last_lba = map->lba_map_last_lba;
524 if (lba >= first_lba && lba <= last_lba) {
525 lba = last_lba + 1;
526 cur_map = map;
527 break;
528 }
529 }
530 }
531 if (!cur_map) {
532 spin_unlock(&dev->t10_alua.lba_map_lock);
533 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
534 return 1;
535 }
536 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
537 lba_map_mem_list) {
538 if (map_mem->lba_map_mem_alua_pg_id !=
539 tg_pt_gp->tg_pt_gp_id)
540 continue;
541 switch(map_mem->lba_map_mem_alua_state) {
542 case ALUA_ACCESS_STATE_STANDBY:
543 spin_unlock(&dev->t10_alua.lba_map_lock);
544 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
545 return 1;
546 case ALUA_ACCESS_STATE_UNAVAILABLE:
547 spin_unlock(&dev->t10_alua.lba_map_lock);
548 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
549 return 1;
550 default:
551 break;
552 }
553 }
554 }
555 spin_unlock(&dev->t10_alua.lba_map_lock);
556 return 0;
557 }
558
559 static inline int core_alua_state_standby(
560 struct se_cmd *cmd,
561 unsigned char *cdb)
562 {
563 /*
564 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
565 * spc4r17 section 5.9.2.4.4
566 */
567 switch (cdb[0]) {
568 case INQUIRY:
569 case LOG_SELECT:
570 case LOG_SENSE:
571 case MODE_SELECT:
572 case MODE_SENSE:
573 case REPORT_LUNS:
574 case RECEIVE_DIAGNOSTIC:
575 case SEND_DIAGNOSTIC:
576 case READ_CAPACITY:
577 return 0;
578 case SERVICE_ACTION_IN_16:
579 switch (cdb[1] & 0x1f) {
580 case SAI_READ_CAPACITY_16:
581 return 0;
582 default:
583 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
584 return 1;
585 }
586 case MAINTENANCE_IN:
587 switch (cdb[1] & 0x1f) {
588 case MI_REPORT_TARGET_PGS:
589 return 0;
590 default:
591 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
592 return 1;
593 }
594 case MAINTENANCE_OUT:
595 switch (cdb[1]) {
596 case MO_SET_TARGET_PGS:
597 return 0;
598 default:
599 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
600 return 1;
601 }
602 case REQUEST_SENSE:
603 case PERSISTENT_RESERVE_IN:
604 case PERSISTENT_RESERVE_OUT:
605 case READ_BUFFER:
606 case WRITE_BUFFER:
607 return 0;
608 default:
609 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
610 return 1;
611 }
612
613 return 0;
614 }
615
616 static inline int core_alua_state_unavailable(
617 struct se_cmd *cmd,
618 unsigned char *cdb)
619 {
620 /*
621 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
622 * spc4r17 section 5.9.2.4.5
623 */
624 switch (cdb[0]) {
625 case INQUIRY:
626 case REPORT_LUNS:
627 return 0;
628 case MAINTENANCE_IN:
629 switch (cdb[1] & 0x1f) {
630 case MI_REPORT_TARGET_PGS:
631 return 0;
632 default:
633 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
634 return 1;
635 }
636 case MAINTENANCE_OUT:
637 switch (cdb[1]) {
638 case MO_SET_TARGET_PGS:
639 return 0;
640 default:
641 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
642 return 1;
643 }
644 case REQUEST_SENSE:
645 case READ_BUFFER:
646 case WRITE_BUFFER:
647 return 0;
648 default:
649 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
650 return 1;
651 }
652
653 return 0;
654 }
655
656 static inline int core_alua_state_transition(
657 struct se_cmd *cmd,
658 unsigned char *cdb)
659 {
660 /*
661 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
662 * spc4r17 section 5.9.2.5
663 */
664 switch (cdb[0]) {
665 case INQUIRY:
666 case REPORT_LUNS:
667 return 0;
668 case MAINTENANCE_IN:
669 switch (cdb[1] & 0x1f) {
670 case MI_REPORT_TARGET_PGS:
671 return 0;
672 default:
673 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
674 return 1;
675 }
676 case REQUEST_SENSE:
677 case READ_BUFFER:
678 case WRITE_BUFFER:
679 return 0;
680 default:
681 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
682 return 1;
683 }
684
685 return 0;
686 }
687
688 /*
689 * return 1: Is used to signal LUN not accessible, and check condition/not ready
690 * return 0: Used to signal success
691 * return -1: Used to signal failure, and invalid cdb field
692 */
693 sense_reason_t
694 target_alua_state_check(struct se_cmd *cmd)
695 {
696 struct se_device *dev = cmd->se_dev;
697 unsigned char *cdb = cmd->t_task_cdb;
698 struct se_lun *lun = cmd->se_lun;
699 struct se_port *port = lun->lun_sep;
700 struct t10_alua_tg_pt_gp *tg_pt_gp;
701 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
702 int out_alua_state, nonop_delay_msecs;
703
704 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
705 return 0;
706 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
707 return 0;
708
709 if (!port)
710 return 0;
711 /*
712 * First, check for a struct se_port specific secondary ALUA target port
713 * access state: OFFLINE
714 */
715 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
716 pr_debug("ALUA: Got secondary offline status for local"
717 " target port\n");
718 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
719 return TCM_CHECK_CONDITION_NOT_READY;
720 }
721 /*
722 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
723 * ALUA target port group, to obtain current ALUA access state.
724 * Otherwise look for the underlying struct se_device association with
725 * a ALUA logical unit group.
726 */
727 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
728 if (!tg_pt_gp_mem)
729 return 0;
730
731 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
732 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
733 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
734 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
735 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
736 /*
737 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
738 * statement so the compiler knows explicitly to check this case first.
739 * For the Optimized ALUA access state case, we want to process the
740 * incoming fabric cmd ASAP..
741 */
742 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
743 return 0;
744
745 switch (out_alua_state) {
746 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
747 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
748 break;
749 case ALUA_ACCESS_STATE_STANDBY:
750 if (core_alua_state_standby(cmd, cdb))
751 return TCM_CHECK_CONDITION_NOT_READY;
752 break;
753 case ALUA_ACCESS_STATE_UNAVAILABLE:
754 if (core_alua_state_unavailable(cmd, cdb))
755 return TCM_CHECK_CONDITION_NOT_READY;
756 break;
757 case ALUA_ACCESS_STATE_TRANSITION:
758 if (core_alua_state_transition(cmd, cdb))
759 return TCM_CHECK_CONDITION_NOT_READY;
760 break;
761 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
762 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
763 return TCM_CHECK_CONDITION_NOT_READY;
764 break;
765 /*
766 * OFFLINE is a secondary ALUA target port group access state, that is
767 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
768 */
769 case ALUA_ACCESS_STATE_OFFLINE:
770 default:
771 pr_err("Unknown ALUA access state: 0x%02x\n",
772 out_alua_state);
773 return TCM_INVALID_CDB_FIELD;
774 }
775
776 return 0;
777 }
778
779 /*
780 * Check implicit and explicit ALUA state change request.
781 */
782 static sense_reason_t
783 core_alua_check_transition(int state, int valid, int *primary)
784 {
785 /*
786 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
787 * defined as primary target port asymmetric access states.
788 */
789 switch (state) {
790 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
791 if (!(valid & ALUA_AO_SUP))
792 goto not_supported;
793 *primary = 1;
794 break;
795 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
796 if (!(valid & ALUA_AN_SUP))
797 goto not_supported;
798 *primary = 1;
799 break;
800 case ALUA_ACCESS_STATE_STANDBY:
801 if (!(valid & ALUA_S_SUP))
802 goto not_supported;
803 *primary = 1;
804 break;
805 case ALUA_ACCESS_STATE_UNAVAILABLE:
806 if (!(valid & ALUA_U_SUP))
807 goto not_supported;
808 *primary = 1;
809 break;
810 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
811 if (!(valid & ALUA_LBD_SUP))
812 goto not_supported;
813 *primary = 1;
814 break;
815 case ALUA_ACCESS_STATE_OFFLINE:
816 /*
817 * OFFLINE state is defined as a secondary target port
818 * asymmetric access state.
819 */
820 if (!(valid & ALUA_O_SUP))
821 goto not_supported;
822 *primary = 0;
823 break;
824 case ALUA_ACCESS_STATE_TRANSITION:
825 /*
826 * Transitioning is set internally, and
827 * cannot be selected manually.
828 */
829 goto not_supported;
830 default:
831 pr_err("Unknown ALUA access state: 0x%02x\n", state);
832 return TCM_INVALID_PARAMETER_LIST;
833 }
834
835 return 0;
836
837 not_supported:
838 pr_err("ALUA access state %s not supported",
839 core_alua_dump_state(state));
840 return TCM_INVALID_PARAMETER_LIST;
841 }
842
843 static char *core_alua_dump_state(int state)
844 {
845 switch (state) {
846 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
847 return "Active/Optimized";
848 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
849 return "Active/NonOptimized";
850 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
851 return "LBA Dependent";
852 case ALUA_ACCESS_STATE_STANDBY:
853 return "Standby";
854 case ALUA_ACCESS_STATE_UNAVAILABLE:
855 return "Unavailable";
856 case ALUA_ACCESS_STATE_OFFLINE:
857 return "Offline";
858 case ALUA_ACCESS_STATE_TRANSITION:
859 return "Transitioning";
860 default:
861 return "Unknown";
862 }
863
864 return NULL;
865 }
866
867 char *core_alua_dump_status(int status)
868 {
869 switch (status) {
870 case ALUA_STATUS_NONE:
871 return "None";
872 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
873 return "Altered by Explicit STPG";
874 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
875 return "Altered by Implicit ALUA";
876 default:
877 return "Unknown";
878 }
879
880 return NULL;
881 }
882
883 /*
884 * Used by fabric modules to determine when we need to delay processing
885 * for the Active/NonOptimized paths..
886 */
887 int core_alua_check_nonop_delay(
888 struct se_cmd *cmd)
889 {
890 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
891 return 0;
892 if (in_interrupt())
893 return 0;
894 /*
895 * The ALUA Active/NonOptimized access state delay can be disabled
896 * in via configfs with a value of zero
897 */
898 if (!cmd->alua_nonop_delay)
899 return 0;
900 /*
901 * struct se_cmd->alua_nonop_delay gets set by a target port group
902 * defined interval in core_alua_state_nonoptimized()
903 */
904 msleep_interruptible(cmd->alua_nonop_delay);
905 return 0;
906 }
907 EXPORT_SYMBOL(core_alua_check_nonop_delay);
908
909 /*
910 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
911 *
912 */
913 static int core_alua_write_tpg_metadata(
914 const char *path,
915 unsigned char *md_buf,
916 u32 md_buf_len)
917 {
918 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
919 int ret;
920
921 if (IS_ERR(file)) {
922 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
923 return -ENODEV;
924 }
925 ret = kernel_write(file, md_buf, md_buf_len, 0);
926 if (ret < 0)
927 pr_err("Error writing ALUA metadata file: %s\n", path);
928 fput(file);
929 return (ret < 0) ? -EIO : 0;
930 }
931
932 /*
933 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
934 */
935 static int core_alua_update_tpg_primary_metadata(
936 struct t10_alua_tg_pt_gp *tg_pt_gp)
937 {
938 unsigned char *md_buf;
939 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
940 char path[ALUA_METADATA_PATH_LEN];
941 int len, rc;
942
943 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
944 if (!md_buf) {
945 pr_err("Unable to allocate buf for ALUA metadata\n");
946 return -ENOMEM;
947 }
948
949 memset(path, 0, ALUA_METADATA_PATH_LEN);
950
951 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
952 "tg_pt_gp_id=%hu\n"
953 "alua_access_state=0x%02x\n"
954 "alua_access_status=0x%02x\n",
955 tg_pt_gp->tg_pt_gp_id,
956 tg_pt_gp->tg_pt_gp_alua_pending_state,
957 tg_pt_gp->tg_pt_gp_alua_access_status);
958
959 snprintf(path, ALUA_METADATA_PATH_LEN,
960 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
961 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
962
963 rc = core_alua_write_tpg_metadata(path, md_buf, len);
964 kfree(md_buf);
965 return rc;
966 }
967
968 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
969 {
970 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
971 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
972 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
973 struct se_dev_entry *se_deve;
974 struct se_lun_acl *lacl;
975 struct se_port *port;
976 struct t10_alua_tg_pt_gp_member *mem;
977 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
978 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
979
980 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
981 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
982 tg_pt_gp_mem_list) {
983 port = mem->tg_pt;
984 /*
985 * After an implicit target port asymmetric access state
986 * change, a device server shall establish a unit attention
987 * condition for the initiator port associated with every I_T
988 * nexus with the additional sense code set to ASYMMETRIC
989 * ACCESS STATE CHANGED.
990 *
991 * After an explicit target port asymmetric access state
992 * change, a device server shall establish a unit attention
993 * condition with the additional sense code set to ASYMMETRIC
994 * ACCESS STATE CHANGED for the initiator port associated with
995 * every I_T nexus other than the I_T nexus on which the SET
996 * TARGET PORT GROUPS command
997 */
998 atomic_inc_mb(&mem->tg_pt_gp_mem_ref_cnt);
999 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1000
1001 spin_lock_bh(&port->sep_alua_lock);
1002 list_for_each_entry(se_deve, &port->sep_alua_list,
1003 alua_port_list) {
1004 lacl = rcu_dereference_check(se_deve->se_lun_acl,
1005 lockdep_is_held(&port->sep_alua_lock));
1006 /*
1007 * se_deve->se_lun_acl pointer may be NULL for a
1008 * entry created without explicit Node+MappedLUN ACLs
1009 */
1010 if (!lacl)
1011 continue;
1012
1013 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1014 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1015 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1016 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1017 (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1018 (tg_pt_gp->tg_pt_gp_alua_port == port))
1019 continue;
1020
1021 core_scsi3_ua_allocate(lacl->se_lun_nacl,
1022 se_deve->mapped_lun, 0x2A,
1023 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1024 }
1025 spin_unlock_bh(&port->sep_alua_lock);
1026
1027 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1028 atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt);
1029 }
1030 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1031 /*
1032 * Update the ALUA metadata buf that has been allocated in
1033 * core_alua_do_port_transition(), this metadata will be written
1034 * to struct file.
1035 *
1036 * Note that there is the case where we do not want to update the
1037 * metadata when the saved metadata is being parsed in userspace
1038 * when setting the existing port access state and access status.
1039 *
1040 * Also note that the failure to write out the ALUA metadata to
1041 * struct file does NOT affect the actual ALUA transition.
1042 */
1043 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1044 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1045 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1046 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1047 }
1048 /*
1049 * Set the current primary ALUA access state to the requested new state
1050 */
1051 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1052 tg_pt_gp->tg_pt_gp_alua_pending_state);
1053
1054 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1055 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1056 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1057 tg_pt_gp->tg_pt_gp_id,
1058 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1059 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1060 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1061 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1062 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1063
1064 if (tg_pt_gp->tg_pt_gp_transition_complete)
1065 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1066 }
1067
1068 static int core_alua_do_transition_tg_pt(
1069 struct t10_alua_tg_pt_gp *tg_pt_gp,
1070 int new_state,
1071 int explicit)
1072 {
1073 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1074 DECLARE_COMPLETION_ONSTACK(wait);
1075
1076 /* Nothing to be done here */
1077 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1078 return 0;
1079
1080 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1081 return -EAGAIN;
1082
1083 /*
1084 * Flush any pending transitions
1085 */
1086 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1087 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1088 ALUA_ACCESS_STATE_TRANSITION) {
1089 /* Just in case */
1090 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1091 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1092 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1093 wait_for_completion(&wait);
1094 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1095 return 0;
1096 }
1097
1098 /*
1099 * Save the old primary ALUA access state, and set the current state
1100 * to ALUA_ACCESS_STATE_TRANSITION.
1101 */
1102 tg_pt_gp->tg_pt_gp_alua_previous_state =
1103 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1104 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1105
1106 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1107 ALUA_ACCESS_STATE_TRANSITION);
1108 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1109 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1110 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1111
1112 /*
1113 * Check for the optional ALUA primary state transition delay
1114 */
1115 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1116 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1117
1118 /*
1119 * Take a reference for workqueue item
1120 */
1121 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1122 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1123 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1124
1125 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1126 unsigned long transition_tmo;
1127
1128 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1129 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1130 &tg_pt_gp->tg_pt_gp_transition_work,
1131 transition_tmo);
1132 } else {
1133 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1134 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1135 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1136 wait_for_completion(&wait);
1137 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1138 }
1139
1140 return 0;
1141 }
1142
1143 int core_alua_do_port_transition(
1144 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1145 struct se_device *l_dev,
1146 struct se_port *l_port,
1147 struct se_node_acl *l_nacl,
1148 int new_state,
1149 int explicit)
1150 {
1151 struct se_device *dev;
1152 struct t10_alua_lu_gp *lu_gp;
1153 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1154 struct t10_alua_tg_pt_gp *tg_pt_gp;
1155 int primary, valid_states, rc = 0;
1156
1157 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1158 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1159 return -EINVAL;
1160
1161 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1162 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1163 lu_gp = local_lu_gp_mem->lu_gp;
1164 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1165 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1166 /*
1167 * For storage objects that are members of the 'default_lu_gp',
1168 * we only do transition on the passed *l_tp_pt_gp, and not
1169 * on all of the matching target port groups IDs in default_lu_gp.
1170 */
1171 if (!lu_gp->lu_gp_id) {
1172 /*
1173 * core_alua_do_transition_tg_pt() will always return
1174 * success.
1175 */
1176 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1177 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1178 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1179 new_state, explicit);
1180 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1181 return rc;
1182 }
1183 /*
1184 * For all other LU groups aside from 'default_lu_gp', walk all of
1185 * the associated storage objects looking for a matching target port
1186 * group ID from the local target port group.
1187 */
1188 spin_lock(&lu_gp->lu_gp_lock);
1189 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1190 lu_gp_mem_list) {
1191
1192 dev = lu_gp_mem->lu_gp_mem_dev;
1193 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1194 spin_unlock(&lu_gp->lu_gp_lock);
1195
1196 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1197 list_for_each_entry(tg_pt_gp,
1198 &dev->t10_alua.tg_pt_gps_list,
1199 tg_pt_gp_list) {
1200
1201 if (!tg_pt_gp->tg_pt_gp_valid_id)
1202 continue;
1203 /*
1204 * If the target behavior port asymmetric access state
1205 * is changed for any target port group accessible via
1206 * a logical unit within a LU group, the target port
1207 * behavior group asymmetric access states for the same
1208 * target port group accessible via other logical units
1209 * in that LU group will also change.
1210 */
1211 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1212 continue;
1213
1214 if (l_tg_pt_gp == tg_pt_gp) {
1215 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1216 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1217 } else {
1218 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1219 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1220 }
1221 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1222 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1223 /*
1224 * core_alua_do_transition_tg_pt() will always return
1225 * success.
1226 */
1227 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1228 new_state, explicit);
1229
1230 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1231 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1232 if (rc)
1233 break;
1234 }
1235 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1236
1237 spin_lock(&lu_gp->lu_gp_lock);
1238 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1239 }
1240 spin_unlock(&lu_gp->lu_gp_lock);
1241
1242 if (!rc) {
1243 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1244 " Group IDs: %hu %s transition to primary state: %s\n",
1245 config_item_name(&lu_gp->lu_gp_group.cg_item),
1246 l_tg_pt_gp->tg_pt_gp_id,
1247 (explicit) ? "explicit" : "implicit",
1248 core_alua_dump_state(new_state));
1249 }
1250
1251 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1252 return rc;
1253 }
1254
1255 /*
1256 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1257 */
1258 static int core_alua_update_tpg_secondary_metadata(
1259 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1260 struct se_port *port)
1261 {
1262 unsigned char *md_buf;
1263 struct se_portal_group *se_tpg = port->sep_tpg;
1264 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1265 int len, rc;
1266
1267 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1268 if (!md_buf) {
1269 pr_err("Unable to allocate buf for ALUA metadata\n");
1270 return -ENOMEM;
1271 }
1272
1273 memset(path, 0, ALUA_METADATA_PATH_LEN);
1274 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1275
1276 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1277 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1278
1279 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1280 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1281 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1282
1283 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1284 "alua_tg_pt_status=0x%02x\n",
1285 atomic_read(&port->sep_tg_pt_secondary_offline),
1286 port->sep_tg_pt_secondary_stat);
1287
1288 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1289 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1290 port->sep_lun->unpacked_lun);
1291
1292 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1293 kfree(md_buf);
1294
1295 return rc;
1296 }
1297
1298 static int core_alua_set_tg_pt_secondary_state(
1299 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1300 struct se_port *port,
1301 int explicit,
1302 int offline)
1303 {
1304 struct t10_alua_tg_pt_gp *tg_pt_gp;
1305 int trans_delay_msecs;
1306
1307 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1308 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1309 if (!tg_pt_gp) {
1310 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1311 pr_err("Unable to complete secondary state"
1312 " transition\n");
1313 return -EINVAL;
1314 }
1315 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1316 /*
1317 * Set the secondary ALUA target port access state to OFFLINE
1318 * or release the previously secondary state for struct se_port
1319 */
1320 if (offline)
1321 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1322 else
1323 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1324
1325 port->sep_tg_pt_secondary_stat = (explicit) ?
1326 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1327 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1328
1329 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1330 " to secondary access state: %s\n", (explicit) ? "explicit" :
1331 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1332 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1333
1334 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1335 /*
1336 * Do the optional transition delay after we set the secondary
1337 * ALUA access state.
1338 */
1339 if (trans_delay_msecs != 0)
1340 msleep_interruptible(trans_delay_msecs);
1341 /*
1342 * See if we need to update the ALUA fabric port metadata for
1343 * secondary state and status
1344 */
1345 if (port->sep_tg_pt_secondary_write_md) {
1346 mutex_lock(&port->sep_tg_pt_md_mutex);
1347 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1348 mutex_unlock(&port->sep_tg_pt_md_mutex);
1349 }
1350
1351 return 0;
1352 }
1353
1354 struct t10_alua_lba_map *
1355 core_alua_allocate_lba_map(struct list_head *list,
1356 u64 first_lba, u64 last_lba)
1357 {
1358 struct t10_alua_lba_map *lba_map;
1359
1360 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1361 if (!lba_map) {
1362 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1363 return ERR_PTR(-ENOMEM);
1364 }
1365 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1366 lba_map->lba_map_first_lba = first_lba;
1367 lba_map->lba_map_last_lba = last_lba;
1368
1369 list_add_tail(&lba_map->lba_map_list, list);
1370 return lba_map;
1371 }
1372
1373 int
1374 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1375 int pg_id, int state)
1376 {
1377 struct t10_alua_lba_map_member *lba_map_mem;
1378
1379 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1380 lba_map_mem_list) {
1381 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1382 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1383 return -EINVAL;
1384 }
1385 }
1386
1387 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1388 if (!lba_map_mem) {
1389 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1390 return -ENOMEM;
1391 }
1392 lba_map_mem->lba_map_mem_alua_state = state;
1393 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1394
1395 list_add_tail(&lba_map_mem->lba_map_mem_list,
1396 &lba_map->lba_map_mem_list);
1397 return 0;
1398 }
1399
1400 void
1401 core_alua_free_lba_map(struct list_head *lba_list)
1402 {
1403 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1404 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1405
1406 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1407 lba_map_list) {
1408 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1409 &lba_map->lba_map_mem_list,
1410 lba_map_mem_list) {
1411 list_del(&lba_map_mem->lba_map_mem_list);
1412 kmem_cache_free(t10_alua_lba_map_mem_cache,
1413 lba_map_mem);
1414 }
1415 list_del(&lba_map->lba_map_list);
1416 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1417 }
1418 }
1419
1420 void
1421 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1422 int segment_size, int segment_mult)
1423 {
1424 struct list_head old_lba_map_list;
1425 struct t10_alua_tg_pt_gp *tg_pt_gp;
1426 int activate = 0, supported;
1427
1428 INIT_LIST_HEAD(&old_lba_map_list);
1429 spin_lock(&dev->t10_alua.lba_map_lock);
1430 dev->t10_alua.lba_map_segment_size = segment_size;
1431 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1432 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1433 if (lba_map_list) {
1434 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1435 activate = 1;
1436 }
1437 spin_unlock(&dev->t10_alua.lba_map_lock);
1438 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1439 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1440 tg_pt_gp_list) {
1441
1442 if (!tg_pt_gp->tg_pt_gp_valid_id)
1443 continue;
1444 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1445 if (activate)
1446 supported |= ALUA_LBD_SUP;
1447 else
1448 supported &= ~ALUA_LBD_SUP;
1449 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1450 }
1451 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1452 core_alua_free_lba_map(&old_lba_map_list);
1453 }
1454
1455 struct t10_alua_lu_gp *
1456 core_alua_allocate_lu_gp(const char *name, int def_group)
1457 {
1458 struct t10_alua_lu_gp *lu_gp;
1459
1460 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1461 if (!lu_gp) {
1462 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1463 return ERR_PTR(-ENOMEM);
1464 }
1465 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1466 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1467 spin_lock_init(&lu_gp->lu_gp_lock);
1468 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1469
1470 if (def_group) {
1471 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1472 lu_gp->lu_gp_valid_id = 1;
1473 alua_lu_gps_count++;
1474 }
1475
1476 return lu_gp;
1477 }
1478
1479 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1480 {
1481 struct t10_alua_lu_gp *lu_gp_tmp;
1482 u16 lu_gp_id_tmp;
1483 /*
1484 * The lu_gp->lu_gp_id may only be set once..
1485 */
1486 if (lu_gp->lu_gp_valid_id) {
1487 pr_warn("ALUA LU Group already has a valid ID,"
1488 " ignoring request\n");
1489 return -EINVAL;
1490 }
1491
1492 spin_lock(&lu_gps_lock);
1493 if (alua_lu_gps_count == 0x0000ffff) {
1494 pr_err("Maximum ALUA alua_lu_gps_count:"
1495 " 0x0000ffff reached\n");
1496 spin_unlock(&lu_gps_lock);
1497 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1498 return -ENOSPC;
1499 }
1500 again:
1501 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1502 alua_lu_gps_counter++;
1503
1504 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1505 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1506 if (!lu_gp_id)
1507 goto again;
1508
1509 pr_warn("ALUA Logical Unit Group ID: %hu"
1510 " already exists, ignoring request\n",
1511 lu_gp_id);
1512 spin_unlock(&lu_gps_lock);
1513 return -EINVAL;
1514 }
1515 }
1516
1517 lu_gp->lu_gp_id = lu_gp_id_tmp;
1518 lu_gp->lu_gp_valid_id = 1;
1519 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1520 alua_lu_gps_count++;
1521 spin_unlock(&lu_gps_lock);
1522
1523 return 0;
1524 }
1525
1526 static struct t10_alua_lu_gp_member *
1527 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1528 {
1529 struct t10_alua_lu_gp_member *lu_gp_mem;
1530
1531 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1532 if (!lu_gp_mem) {
1533 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1534 return ERR_PTR(-ENOMEM);
1535 }
1536 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1537 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1538 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1539
1540 lu_gp_mem->lu_gp_mem_dev = dev;
1541 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1542
1543 return lu_gp_mem;
1544 }
1545
1546 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1547 {
1548 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1549 /*
1550 * Once we have reached this point, config_item_put() has
1551 * already been called from target_core_alua_drop_lu_gp().
1552 *
1553 * Here, we remove the *lu_gp from the global list so that
1554 * no associations can be made while we are releasing
1555 * struct t10_alua_lu_gp.
1556 */
1557 spin_lock(&lu_gps_lock);
1558 list_del(&lu_gp->lu_gp_node);
1559 alua_lu_gps_count--;
1560 spin_unlock(&lu_gps_lock);
1561 /*
1562 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1563 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1564 * released with core_alua_put_lu_gp_from_name()
1565 */
1566 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1567 cpu_relax();
1568 /*
1569 * Release reference to struct t10_alua_lu_gp * from all associated
1570 * struct se_device.
1571 */
1572 spin_lock(&lu_gp->lu_gp_lock);
1573 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1574 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1575 if (lu_gp_mem->lu_gp_assoc) {
1576 list_del(&lu_gp_mem->lu_gp_mem_list);
1577 lu_gp->lu_gp_members--;
1578 lu_gp_mem->lu_gp_assoc = 0;
1579 }
1580 spin_unlock(&lu_gp->lu_gp_lock);
1581 /*
1582 *
1583 * lu_gp_mem is associated with a single
1584 * struct se_device->dev_alua_lu_gp_mem, and is released when
1585 * struct se_device is released via core_alua_free_lu_gp_mem().
1586 *
1587 * If the passed lu_gp does NOT match the default_lu_gp, assume
1588 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1589 */
1590 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1591 if (lu_gp != default_lu_gp)
1592 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1593 default_lu_gp);
1594 else
1595 lu_gp_mem->lu_gp = NULL;
1596 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1597
1598 spin_lock(&lu_gp->lu_gp_lock);
1599 }
1600 spin_unlock(&lu_gp->lu_gp_lock);
1601
1602 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1603 }
1604
1605 void core_alua_free_lu_gp_mem(struct se_device *dev)
1606 {
1607 struct t10_alua_lu_gp *lu_gp;
1608 struct t10_alua_lu_gp_member *lu_gp_mem;
1609
1610 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1611 if (!lu_gp_mem)
1612 return;
1613
1614 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1615 cpu_relax();
1616
1617 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1618 lu_gp = lu_gp_mem->lu_gp;
1619 if (lu_gp) {
1620 spin_lock(&lu_gp->lu_gp_lock);
1621 if (lu_gp_mem->lu_gp_assoc) {
1622 list_del(&lu_gp_mem->lu_gp_mem_list);
1623 lu_gp->lu_gp_members--;
1624 lu_gp_mem->lu_gp_assoc = 0;
1625 }
1626 spin_unlock(&lu_gp->lu_gp_lock);
1627 lu_gp_mem->lu_gp = NULL;
1628 }
1629 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1630
1631 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1632 }
1633
1634 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1635 {
1636 struct t10_alua_lu_gp *lu_gp;
1637 struct config_item *ci;
1638
1639 spin_lock(&lu_gps_lock);
1640 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1641 if (!lu_gp->lu_gp_valid_id)
1642 continue;
1643 ci = &lu_gp->lu_gp_group.cg_item;
1644 if (!strcmp(config_item_name(ci), name)) {
1645 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1646 spin_unlock(&lu_gps_lock);
1647 return lu_gp;
1648 }
1649 }
1650 spin_unlock(&lu_gps_lock);
1651
1652 return NULL;
1653 }
1654
1655 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1656 {
1657 spin_lock(&lu_gps_lock);
1658 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1659 spin_unlock(&lu_gps_lock);
1660 }
1661
1662 /*
1663 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1664 */
1665 void __core_alua_attach_lu_gp_mem(
1666 struct t10_alua_lu_gp_member *lu_gp_mem,
1667 struct t10_alua_lu_gp *lu_gp)
1668 {
1669 spin_lock(&lu_gp->lu_gp_lock);
1670 lu_gp_mem->lu_gp = lu_gp;
1671 lu_gp_mem->lu_gp_assoc = 1;
1672 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1673 lu_gp->lu_gp_members++;
1674 spin_unlock(&lu_gp->lu_gp_lock);
1675 }
1676
1677 /*
1678 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1679 */
1680 void __core_alua_drop_lu_gp_mem(
1681 struct t10_alua_lu_gp_member *lu_gp_mem,
1682 struct t10_alua_lu_gp *lu_gp)
1683 {
1684 spin_lock(&lu_gp->lu_gp_lock);
1685 list_del(&lu_gp_mem->lu_gp_mem_list);
1686 lu_gp_mem->lu_gp = NULL;
1687 lu_gp_mem->lu_gp_assoc = 0;
1688 lu_gp->lu_gp_members--;
1689 spin_unlock(&lu_gp->lu_gp_lock);
1690 }
1691
1692 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1693 const char *name, int def_group)
1694 {
1695 struct t10_alua_tg_pt_gp *tg_pt_gp;
1696
1697 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1698 if (!tg_pt_gp) {
1699 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1700 return NULL;
1701 }
1702 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1703 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1704 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1705 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1706 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1707 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1708 core_alua_do_transition_tg_pt_work);
1709 tg_pt_gp->tg_pt_gp_dev = dev;
1710 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1711 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1712 /*
1713 * Enable both explicit and implicit ALUA support by default
1714 */
1715 tg_pt_gp->tg_pt_gp_alua_access_type =
1716 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1717 /*
1718 * Set the default Active/NonOptimized Delay in milliseconds
1719 */
1720 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1721 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1722 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1723
1724 /*
1725 * Enable all supported states
1726 */
1727 tg_pt_gp->tg_pt_gp_alua_supported_states =
1728 ALUA_T_SUP | ALUA_O_SUP |
1729 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1730
1731 if (def_group) {
1732 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1733 tg_pt_gp->tg_pt_gp_id =
1734 dev->t10_alua.alua_tg_pt_gps_counter++;
1735 tg_pt_gp->tg_pt_gp_valid_id = 1;
1736 dev->t10_alua.alua_tg_pt_gps_count++;
1737 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1738 &dev->t10_alua.tg_pt_gps_list);
1739 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1740 }
1741
1742 return tg_pt_gp;
1743 }
1744
1745 int core_alua_set_tg_pt_gp_id(
1746 struct t10_alua_tg_pt_gp *tg_pt_gp,
1747 u16 tg_pt_gp_id)
1748 {
1749 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1750 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1751 u16 tg_pt_gp_id_tmp;
1752
1753 /*
1754 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1755 */
1756 if (tg_pt_gp->tg_pt_gp_valid_id) {
1757 pr_warn("ALUA TG PT Group already has a valid ID,"
1758 " ignoring request\n");
1759 return -EINVAL;
1760 }
1761
1762 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1763 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1764 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1765 " 0x0000ffff reached\n");
1766 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1767 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1768 return -ENOSPC;
1769 }
1770 again:
1771 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1772 dev->t10_alua.alua_tg_pt_gps_counter++;
1773
1774 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1775 tg_pt_gp_list) {
1776 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1777 if (!tg_pt_gp_id)
1778 goto again;
1779
1780 pr_err("ALUA Target Port Group ID: %hu already"
1781 " exists, ignoring request\n", tg_pt_gp_id);
1782 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1783 return -EINVAL;
1784 }
1785 }
1786
1787 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1788 tg_pt_gp->tg_pt_gp_valid_id = 1;
1789 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1790 &dev->t10_alua.tg_pt_gps_list);
1791 dev->t10_alua.alua_tg_pt_gps_count++;
1792 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1793
1794 return 0;
1795 }
1796
1797 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1798 struct se_port *port)
1799 {
1800 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1801
1802 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1803 GFP_KERNEL);
1804 if (!tg_pt_gp_mem) {
1805 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1806 return ERR_PTR(-ENOMEM);
1807 }
1808 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1809 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1810 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1811
1812 tg_pt_gp_mem->tg_pt = port;
1813 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1814
1815 return tg_pt_gp_mem;
1816 }
1817
1818 void core_alua_free_tg_pt_gp(
1819 struct t10_alua_tg_pt_gp *tg_pt_gp)
1820 {
1821 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1822 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1823
1824 /*
1825 * Once we have reached this point, config_item_put() has already
1826 * been called from target_core_alua_drop_tg_pt_gp().
1827 *
1828 * Here we remove *tg_pt_gp from the global list so that
1829 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1830 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1831 */
1832 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1833 list_del(&tg_pt_gp->tg_pt_gp_list);
1834 dev->t10_alua.alua_tg_pt_gps_counter--;
1835 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1836
1837 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1838
1839 /*
1840 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1841 * core_alua_get_tg_pt_gp_by_name() in
1842 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1843 * to be released with core_alua_put_tg_pt_gp_from_name().
1844 */
1845 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1846 cpu_relax();
1847
1848 /*
1849 * Release reference to struct t10_alua_tg_pt_gp from all associated
1850 * struct se_port.
1851 */
1852 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1853 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1854 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1855 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1856 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1857 tg_pt_gp->tg_pt_gp_members--;
1858 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1859 }
1860 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1861 /*
1862 * tg_pt_gp_mem is associated with a single
1863 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1864 * core_alua_free_tg_pt_gp_mem().
1865 *
1866 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1867 * assume we want to re-associate a given tg_pt_gp_mem with
1868 * default_tg_pt_gp.
1869 */
1870 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1871 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1872 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1873 dev->t10_alua.default_tg_pt_gp);
1874 } else
1875 tg_pt_gp_mem->tg_pt_gp = NULL;
1876 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1877
1878 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1879 }
1880 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1881
1882 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1883 }
1884
1885 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1886 {
1887 struct t10_alua_tg_pt_gp *tg_pt_gp;
1888 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1889
1890 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1891 if (!tg_pt_gp_mem)
1892 return;
1893
1894 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1895 cpu_relax();
1896
1897 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1898 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1899 if (tg_pt_gp) {
1900 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1901 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1902 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1903 tg_pt_gp->tg_pt_gp_members--;
1904 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1905 }
1906 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1907 tg_pt_gp_mem->tg_pt_gp = NULL;
1908 }
1909 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1910
1911 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1912 }
1913
1914 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1915 struct se_device *dev, const char *name)
1916 {
1917 struct t10_alua_tg_pt_gp *tg_pt_gp;
1918 struct config_item *ci;
1919
1920 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1921 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1922 tg_pt_gp_list) {
1923 if (!tg_pt_gp->tg_pt_gp_valid_id)
1924 continue;
1925 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1926 if (!strcmp(config_item_name(ci), name)) {
1927 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1928 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1929 return tg_pt_gp;
1930 }
1931 }
1932 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1933
1934 return NULL;
1935 }
1936
1937 static void core_alua_put_tg_pt_gp_from_name(
1938 struct t10_alua_tg_pt_gp *tg_pt_gp)
1939 {
1940 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1941
1942 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1943 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1944 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1945 }
1946
1947 /*
1948 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1949 */
1950 void __core_alua_attach_tg_pt_gp_mem(
1951 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1952 struct t10_alua_tg_pt_gp *tg_pt_gp)
1953 {
1954 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1955 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1956 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1957 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1958 &tg_pt_gp->tg_pt_gp_mem_list);
1959 tg_pt_gp->tg_pt_gp_members++;
1960 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1961 }
1962
1963 /*
1964 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1965 */
1966 static void __core_alua_drop_tg_pt_gp_mem(
1967 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1968 struct t10_alua_tg_pt_gp *tg_pt_gp)
1969 {
1970 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1971 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1972 tg_pt_gp_mem->tg_pt_gp = NULL;
1973 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1974 tg_pt_gp->tg_pt_gp_members--;
1975 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1976 }
1977
1978 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1979 {
1980 struct config_item *tg_pt_ci;
1981 struct t10_alua_tg_pt_gp *tg_pt_gp;
1982 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1983 ssize_t len = 0;
1984
1985 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1986 if (!tg_pt_gp_mem)
1987 return len;
1988
1989 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1990 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1991 if (tg_pt_gp) {
1992 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1993 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1994 " %hu\nTG Port Primary Access State: %s\nTG Port "
1995 "Primary Access Status: %s\nTG Port Secondary Access"
1996 " State: %s\nTG Port Secondary Access Status: %s\n",
1997 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1998 core_alua_dump_state(atomic_read(
1999 &tg_pt_gp->tg_pt_gp_alua_access_state)),
2000 core_alua_dump_status(
2001 tg_pt_gp->tg_pt_gp_alua_access_status),
2002 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2003 "Offline" : "None",
2004 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2005 }
2006 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2007
2008 return len;
2009 }
2010
2011 ssize_t core_alua_store_tg_pt_gp_info(
2012 struct se_port *port,
2013 const char *page,
2014 size_t count)
2015 {
2016 struct se_portal_group *tpg;
2017 struct se_lun *lun;
2018 struct se_device *dev = port->sep_lun->lun_se_dev;
2019 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2020 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2021 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2022 int move = 0;
2023
2024 tpg = port->sep_tpg;
2025 lun = port->sep_lun;
2026
2027 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2028 if (!tg_pt_gp_mem)
2029 return 0;
2030
2031 if (count > TG_PT_GROUP_NAME_BUF) {
2032 pr_err("ALUA Target Port Group alias too large!\n");
2033 return -EINVAL;
2034 }
2035 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2036 memcpy(buf, page, count);
2037 /*
2038 * Any ALUA target port group alias besides "NULL" means we will be
2039 * making a new group association.
2040 */
2041 if (strcmp(strstrip(buf), "NULL")) {
2042 /*
2043 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2044 * struct t10_alua_tg_pt_gp. This reference is released with
2045 * core_alua_put_tg_pt_gp_from_name() below.
2046 */
2047 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2048 strstrip(buf));
2049 if (!tg_pt_gp_new)
2050 return -ENODEV;
2051 }
2052
2053 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2054 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2055 if (tg_pt_gp) {
2056 /*
2057 * Clearing an existing tg_pt_gp association, and replacing
2058 * with the default_tg_pt_gp.
2059 */
2060 if (!tg_pt_gp_new) {
2061 pr_debug("Target_Core_ConfigFS: Moving"
2062 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2063 " alua/%s, ID: %hu back to"
2064 " default_tg_pt_gp\n",
2065 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2066 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2067 config_item_name(&lun->lun_group.cg_item),
2068 config_item_name(
2069 &tg_pt_gp->tg_pt_gp_group.cg_item),
2070 tg_pt_gp->tg_pt_gp_id);
2071
2072 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2073 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2074 dev->t10_alua.default_tg_pt_gp);
2075 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2076
2077 return count;
2078 }
2079 /*
2080 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2081 */
2082 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2083 move = 1;
2084 }
2085 /*
2086 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2087 */
2088 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2089 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2090 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2091 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2092 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2093 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2094 config_item_name(&lun->lun_group.cg_item),
2095 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2096 tg_pt_gp_new->tg_pt_gp_id);
2097
2098 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2099 return count;
2100 }
2101
2102 ssize_t core_alua_show_access_type(
2103 struct t10_alua_tg_pt_gp *tg_pt_gp,
2104 char *page)
2105 {
2106 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2107 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2108 return sprintf(page, "Implicit and Explicit\n");
2109 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2110 return sprintf(page, "Implicit\n");
2111 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2112 return sprintf(page, "Explicit\n");
2113 else
2114 return sprintf(page, "None\n");
2115 }
2116
2117 ssize_t core_alua_store_access_type(
2118 struct t10_alua_tg_pt_gp *tg_pt_gp,
2119 const char *page,
2120 size_t count)
2121 {
2122 unsigned long tmp;
2123 int ret;
2124
2125 ret = kstrtoul(page, 0, &tmp);
2126 if (ret < 0) {
2127 pr_err("Unable to extract alua_access_type\n");
2128 return ret;
2129 }
2130 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2131 pr_err("Illegal value for alua_access_type:"
2132 " %lu\n", tmp);
2133 return -EINVAL;
2134 }
2135 if (tmp == 3)
2136 tg_pt_gp->tg_pt_gp_alua_access_type =
2137 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2138 else if (tmp == 2)
2139 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2140 else if (tmp == 1)
2141 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2142 else
2143 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2144
2145 return count;
2146 }
2147
2148 ssize_t core_alua_show_nonop_delay_msecs(
2149 struct t10_alua_tg_pt_gp *tg_pt_gp,
2150 char *page)
2151 {
2152 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2153 }
2154
2155 ssize_t core_alua_store_nonop_delay_msecs(
2156 struct t10_alua_tg_pt_gp *tg_pt_gp,
2157 const char *page,
2158 size_t count)
2159 {
2160 unsigned long tmp;
2161 int ret;
2162
2163 ret = kstrtoul(page, 0, &tmp);
2164 if (ret < 0) {
2165 pr_err("Unable to extract nonop_delay_msecs\n");
2166 return ret;
2167 }
2168 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2169 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2170 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2171 ALUA_MAX_NONOP_DELAY_MSECS);
2172 return -EINVAL;
2173 }
2174 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2175
2176 return count;
2177 }
2178
2179 ssize_t core_alua_show_trans_delay_msecs(
2180 struct t10_alua_tg_pt_gp *tg_pt_gp,
2181 char *page)
2182 {
2183 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2184 }
2185
2186 ssize_t core_alua_store_trans_delay_msecs(
2187 struct t10_alua_tg_pt_gp *tg_pt_gp,
2188 const char *page,
2189 size_t count)
2190 {
2191 unsigned long tmp;
2192 int ret;
2193
2194 ret = kstrtoul(page, 0, &tmp);
2195 if (ret < 0) {
2196 pr_err("Unable to extract trans_delay_msecs\n");
2197 return ret;
2198 }
2199 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2200 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2201 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2202 ALUA_MAX_TRANS_DELAY_MSECS);
2203 return -EINVAL;
2204 }
2205 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2206
2207 return count;
2208 }
2209
2210 ssize_t core_alua_show_implicit_trans_secs(
2211 struct t10_alua_tg_pt_gp *tg_pt_gp,
2212 char *page)
2213 {
2214 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2215 }
2216
2217 ssize_t core_alua_store_implicit_trans_secs(
2218 struct t10_alua_tg_pt_gp *tg_pt_gp,
2219 const char *page,
2220 size_t count)
2221 {
2222 unsigned long tmp;
2223 int ret;
2224
2225 ret = kstrtoul(page, 0, &tmp);
2226 if (ret < 0) {
2227 pr_err("Unable to extract implicit_trans_secs\n");
2228 return ret;
2229 }
2230 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2231 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2232 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2233 ALUA_MAX_IMPLICIT_TRANS_SECS);
2234 return -EINVAL;
2235 }
2236 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2237
2238 return count;
2239 }
2240
2241 ssize_t core_alua_show_preferred_bit(
2242 struct t10_alua_tg_pt_gp *tg_pt_gp,
2243 char *page)
2244 {
2245 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2246 }
2247
2248 ssize_t core_alua_store_preferred_bit(
2249 struct t10_alua_tg_pt_gp *tg_pt_gp,
2250 const char *page,
2251 size_t count)
2252 {
2253 unsigned long tmp;
2254 int ret;
2255
2256 ret = kstrtoul(page, 0, &tmp);
2257 if (ret < 0) {
2258 pr_err("Unable to extract preferred ALUA value\n");
2259 return ret;
2260 }
2261 if ((tmp != 0) && (tmp != 1)) {
2262 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2263 return -EINVAL;
2264 }
2265 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2266
2267 return count;
2268 }
2269
2270 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2271 {
2272 if (!lun->lun_sep)
2273 return -ENODEV;
2274
2275 return sprintf(page, "%d\n",
2276 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2277 }
2278
2279 ssize_t core_alua_store_offline_bit(
2280 struct se_lun *lun,
2281 const char *page,
2282 size_t count)
2283 {
2284 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2285 unsigned long tmp;
2286 int ret;
2287
2288 if (!lun->lun_sep)
2289 return -ENODEV;
2290
2291 ret = kstrtoul(page, 0, &tmp);
2292 if (ret < 0) {
2293 pr_err("Unable to extract alua_tg_pt_offline value\n");
2294 return ret;
2295 }
2296 if ((tmp != 0) && (tmp != 1)) {
2297 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2298 tmp);
2299 return -EINVAL;
2300 }
2301 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2302 if (!tg_pt_gp_mem) {
2303 pr_err("Unable to locate *tg_pt_gp_mem\n");
2304 return -EINVAL;
2305 }
2306
2307 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2308 lun->lun_sep, 0, (int)tmp);
2309 if (ret < 0)
2310 return -EINVAL;
2311
2312 return count;
2313 }
2314
2315 ssize_t core_alua_show_secondary_status(
2316 struct se_lun *lun,
2317 char *page)
2318 {
2319 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2320 }
2321
2322 ssize_t core_alua_store_secondary_status(
2323 struct se_lun *lun,
2324 const char *page,
2325 size_t count)
2326 {
2327 unsigned long tmp;
2328 int ret;
2329
2330 ret = kstrtoul(page, 0, &tmp);
2331 if (ret < 0) {
2332 pr_err("Unable to extract alua_tg_pt_status\n");
2333 return ret;
2334 }
2335 if ((tmp != ALUA_STATUS_NONE) &&
2336 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2337 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2338 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2339 tmp);
2340 return -EINVAL;
2341 }
2342 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2343
2344 return count;
2345 }
2346
2347 ssize_t core_alua_show_secondary_write_metadata(
2348 struct se_lun *lun,
2349 char *page)
2350 {
2351 return sprintf(page, "%d\n",
2352 lun->lun_sep->sep_tg_pt_secondary_write_md);
2353 }
2354
2355 ssize_t core_alua_store_secondary_write_metadata(
2356 struct se_lun *lun,
2357 const char *page,
2358 size_t count)
2359 {
2360 unsigned long tmp;
2361 int ret;
2362
2363 ret = kstrtoul(page, 0, &tmp);
2364 if (ret < 0) {
2365 pr_err("Unable to extract alua_tg_pt_write_md\n");
2366 return ret;
2367 }
2368 if ((tmp != 0) && (tmp != 1)) {
2369 pr_err("Illegal value for alua_tg_pt_write_md:"
2370 " %lu\n", tmp);
2371 return -EINVAL;
2372 }
2373 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2374
2375 return count;
2376 }
2377
2378 int core_setup_alua(struct se_device *dev)
2379 {
2380 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2381 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2382 struct t10_alua_lu_gp_member *lu_gp_mem;
2383
2384 /*
2385 * Associate this struct se_device with the default ALUA
2386 * LUN Group.
2387 */
2388 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2389 if (IS_ERR(lu_gp_mem))
2390 return PTR_ERR(lu_gp_mem);
2391
2392 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2393 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2394 default_lu_gp);
2395 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2396
2397 pr_debug("%s: Adding to default ALUA LU Group:"
2398 " core/alua/lu_gps/default_lu_gp\n",
2399 dev->transport->name);
2400 }
2401
2402 return 0;
2403 }
Linux kernel - Deliverables
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