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
target_emulate_report_referrals(struct se_cmd * cmd)66 target_emulate_report_referrals(struct se_cmd *cmd)
67 {
68 struct se_device *dev = cmd->se_dev;
69 struct t10_alua_lba_map *map;
70 struct t10_alua_lba_map_member *map_mem;
71 unsigned char *buf;
72 u32 rd_len = 0, off;
73
74 if (cmd->data_length < 4) {
75 pr_warn("REPORT REFERRALS allocation length %u too"
76 " small\n", cmd->data_length);
77 return TCM_INVALID_CDB_FIELD;
78 }
79
80 buf = transport_kmap_data_sg(cmd);
81 if (!buf)
82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
83
84 off = 4;
85 spin_lock(&dev->t10_alua.lba_map_lock);
86 if (list_empty(&dev->t10_alua.lba_map_list)) {
87 spin_unlock(&dev->t10_alua.lba_map_lock);
88 transport_kunmap_data_sg(cmd);
89
90 return TCM_UNSUPPORTED_SCSI_OPCODE;
91 }
92
93 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
94 lba_map_list) {
95 int desc_num = off + 3;
96 int pg_num;
97
98 off += 4;
99 if (cmd->data_length > off)
100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
101 off += 8;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
104 off += 8;
105 rd_len += 20;
106 pg_num = 0;
107 list_for_each_entry(map_mem, &map->lba_map_mem_list,
108 lba_map_mem_list) {
109 int alua_state = map_mem->lba_map_mem_alua_state;
110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
111
112 if (cmd->data_length > off)
113 buf[off] = alua_state & 0x0f;
114 off += 2;
115 if (cmd->data_length > off)
116 buf[off] = (alua_pg_id >> 8) & 0xff;
117 off++;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id & 0xff);
120 off++;
121 rd_len += 4;
122 pg_num++;
123 }
124 if (cmd->data_length > desc_num)
125 buf[desc_num] = pg_num;
126 }
127 spin_unlock(&dev->t10_alua.lba_map_lock);
128
129 /*
130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
131 */
132 put_unaligned_be16(rd_len, &buf[2]);
133
134 transport_kunmap_data_sg(cmd);
135
136 target_complete_cmd(cmd, GOOD);
137 return 0;
138 }
139
140 /*
141 * REPORT_TARGET_PORT_GROUPS
142 *
143 * See spc4r17 section 6.27
144 */
145 sense_reason_t
target_emulate_report_target_port_groups(struct se_cmd * cmd)146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 {
148 struct se_device *dev = cmd->se_dev;
149 struct 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
target_emulate_set_target_port_groups(struct se_cmd * cmd)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_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
396
397 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
398
399 if (!core_alua_do_port_transition(tg_pt_gp,
400 dev, l_port, nacl,
401 alua_access_state, 1))
402 found = true;
403
404 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
405 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
406 break;
407 }
408 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
409 } else {
410 /*
411 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
412 * the Target Port in question for the the incoming
413 * SET_TARGET_PORT_GROUPS op.
414 */
415 rtpi = get_unaligned_be16(ptr + 2);
416 /*
417 * Locate the matching relative target port identifier
418 * for the struct se_device storage object.
419 */
420 spin_lock(&dev->se_port_lock);
421 list_for_each_entry(port, &dev->dev_sep_list,
422 sep_list) {
423 if (port->sep_rtpi != rtpi)
424 continue;
425
426 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
427
428 spin_unlock(&dev->se_port_lock);
429
430 if (!core_alua_set_tg_pt_secondary_state(
431 tg_pt_gp_mem, port, 1, 1))
432 found = true;
433
434 spin_lock(&dev->se_port_lock);
435 break;
436 }
437 spin_unlock(&dev->se_port_lock);
438 }
439
440 if (!found) {
441 rc = TCM_INVALID_PARAMETER_LIST;
442 goto out;
443 }
444
445 ptr += 4;
446 len += 4;
447 }
448
449 out:
450 transport_kunmap_data_sg(cmd);
451 if (!rc)
452 target_complete_cmd(cmd, GOOD);
453 return rc;
454 }
455
set_ascq(struct se_cmd * cmd,u8 alua_ascq)456 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
457 {
458 /*
459 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
460 * The ALUA additional sense code qualifier (ASCQ) is determined
461 * by the ALUA primary or secondary access state..
462 */
463 pr_debug("[%s]: ALUA TG Port not available, "
464 "SenseKey: NOT_READY, ASC/ASCQ: "
465 "0x04/0x%02x\n",
466 cmd->se_tfo->get_fabric_name(), alua_ascq);
467
468 cmd->scsi_asc = 0x04;
469 cmd->scsi_ascq = alua_ascq;
470 }
471
core_alua_state_nonoptimized(struct se_cmd * cmd,unsigned char * cdb,int nonop_delay_msecs)472 static inline void core_alua_state_nonoptimized(
473 struct se_cmd *cmd,
474 unsigned char *cdb,
475 int nonop_delay_msecs)
476 {
477 /*
478 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
479 * later to determine if processing of this cmd needs to be
480 * temporarily delayed for the Active/NonOptimized primary access state.
481 */
482 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
483 cmd->alua_nonop_delay = nonop_delay_msecs;
484 }
485
core_alua_state_lba_dependent(struct se_cmd * cmd,struct t10_alua_tg_pt_gp * tg_pt_gp)486 static inline int core_alua_state_lba_dependent(
487 struct se_cmd *cmd,
488 struct t10_alua_tg_pt_gp *tg_pt_gp)
489 {
490 struct se_device *dev = cmd->se_dev;
491 u64 segment_size, segment_mult, sectors, lba;
492
493 /* Only need to check for cdb actually containing LBAs */
494 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
495 return 0;
496
497 spin_lock(&dev->t10_alua.lba_map_lock);
498 segment_size = dev->t10_alua.lba_map_segment_size;
499 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
500 sectors = cmd->data_length / dev->dev_attrib.block_size;
501
502 lba = cmd->t_task_lba;
503 while (lba < cmd->t_task_lba + sectors) {
504 struct t10_alua_lba_map *cur_map = NULL, *map;
505 struct t10_alua_lba_map_member *map_mem;
506
507 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
508 lba_map_list) {
509 u64 start_lba, last_lba;
510 u64 first_lba = map->lba_map_first_lba;
511
512 if (segment_mult) {
513 u64 tmp = lba;
514 start_lba = do_div(tmp, segment_size * segment_mult);
515
516 last_lba = first_lba + segment_size - 1;
517 if (start_lba >= first_lba &&
518 start_lba <= last_lba) {
519 lba += segment_size;
520 cur_map = map;
521 break;
522 }
523 } else {
524 last_lba = map->lba_map_last_lba;
525 if (lba >= first_lba && lba <= last_lba) {
526 lba = last_lba + 1;
527 cur_map = map;
528 break;
529 }
530 }
531 }
532 if (!cur_map) {
533 spin_unlock(&dev->t10_alua.lba_map_lock);
534 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
535 return 1;
536 }
537 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
538 lba_map_mem_list) {
539 if (map_mem->lba_map_mem_alua_pg_id !=
540 tg_pt_gp->tg_pt_gp_id)
541 continue;
542 switch(map_mem->lba_map_mem_alua_state) {
543 case ALUA_ACCESS_STATE_STANDBY:
544 spin_unlock(&dev->t10_alua.lba_map_lock);
545 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
546 return 1;
547 case ALUA_ACCESS_STATE_UNAVAILABLE:
548 spin_unlock(&dev->t10_alua.lba_map_lock);
549 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
550 return 1;
551 default:
552 break;
553 }
554 }
555 }
556 spin_unlock(&dev->t10_alua.lba_map_lock);
557 return 0;
558 }
559
core_alua_state_standby(struct se_cmd * cmd,unsigned char * cdb)560 static inline int core_alua_state_standby(
561 struct se_cmd *cmd,
562 unsigned char *cdb)
563 {
564 /*
565 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
566 * spc4r17 section 5.9.2.4.4
567 */
568 switch (cdb[0]) {
569 case INQUIRY:
570 case LOG_SELECT:
571 case LOG_SENSE:
572 case MODE_SELECT:
573 case MODE_SENSE:
574 case REPORT_LUNS:
575 case RECEIVE_DIAGNOSTIC:
576 case SEND_DIAGNOSTIC:
577 case READ_CAPACITY:
578 return 0;
579 case SERVICE_ACTION_IN:
580 switch (cdb[1] & 0x1f) {
581 case SAI_READ_CAPACITY_16:
582 return 0;
583 default:
584 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
585 return 1;
586 }
587 case MAINTENANCE_IN:
588 switch (cdb[1] & 0x1f) {
589 case MI_REPORT_TARGET_PGS:
590 return 0;
591 default:
592 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
593 return 1;
594 }
595 case MAINTENANCE_OUT:
596 switch (cdb[1]) {
597 case MO_SET_TARGET_PGS:
598 return 0;
599 default:
600 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
601 return 1;
602 }
603 case REQUEST_SENSE:
604 case PERSISTENT_RESERVE_IN:
605 case PERSISTENT_RESERVE_OUT:
606 case READ_BUFFER:
607 case WRITE_BUFFER:
608 return 0;
609 default:
610 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
611 return 1;
612 }
613
614 return 0;
615 }
616
core_alua_state_unavailable(struct se_cmd * cmd,unsigned char * cdb)617 static inline int core_alua_state_unavailable(
618 struct se_cmd *cmd,
619 unsigned char *cdb)
620 {
621 /*
622 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
623 * spc4r17 section 5.9.2.4.5
624 */
625 switch (cdb[0]) {
626 case INQUIRY:
627 case REPORT_LUNS:
628 return 0;
629 case MAINTENANCE_IN:
630 switch (cdb[1] & 0x1f) {
631 case MI_REPORT_TARGET_PGS:
632 return 0;
633 default:
634 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
635 return 1;
636 }
637 case MAINTENANCE_OUT:
638 switch (cdb[1]) {
639 case MO_SET_TARGET_PGS:
640 return 0;
641 default:
642 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
643 return 1;
644 }
645 case REQUEST_SENSE:
646 case READ_BUFFER:
647 case WRITE_BUFFER:
648 return 0;
649 default:
650 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
651 return 1;
652 }
653
654 return 0;
655 }
656
core_alua_state_transition(struct se_cmd * cmd,unsigned char * cdb)657 static inline int core_alua_state_transition(
658 struct se_cmd *cmd,
659 unsigned char *cdb)
660 {
661 /*
662 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
663 * spc4r17 section 5.9.2.5
664 */
665 switch (cdb[0]) {
666 case INQUIRY:
667 case REPORT_LUNS:
668 return 0;
669 case MAINTENANCE_IN:
670 switch (cdb[1] & 0x1f) {
671 case MI_REPORT_TARGET_PGS:
672 return 0;
673 default:
674 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
675 return 1;
676 }
677 case REQUEST_SENSE:
678 case READ_BUFFER:
679 case WRITE_BUFFER:
680 return 0;
681 default:
682 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
683 return 1;
684 }
685
686 return 0;
687 }
688
689 /*
690 * return 1: Is used to signal LUN not accessible, and check condition/not ready
691 * return 0: Used to signal success
692 * return -1: Used to signal failure, and invalid cdb field
693 */
694 sense_reason_t
target_alua_state_check(struct se_cmd * cmd)695 target_alua_state_check(struct se_cmd *cmd)
696 {
697 struct se_device *dev = cmd->se_dev;
698 unsigned char *cdb = cmd->t_task_cdb;
699 struct se_lun *lun = cmd->se_lun;
700 struct se_port *port = lun->lun_sep;
701 struct t10_alua_tg_pt_gp *tg_pt_gp;
702 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
703 int out_alua_state, nonop_delay_msecs;
704
705 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
706 return 0;
707 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
708 return 0;
709
710 if (!port)
711 return 0;
712 /*
713 * First, check for a struct se_port specific secondary ALUA target port
714 * access state: OFFLINE
715 */
716 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
717 pr_debug("ALUA: Got secondary offline status for local"
718 " target port\n");
719 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
720 return TCM_CHECK_CONDITION_NOT_READY;
721 }
722 /*
723 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
724 * ALUA target port group, to obtain current ALUA access state.
725 * Otherwise look for the underlying struct se_device association with
726 * a ALUA logical unit group.
727 */
728 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
729 if (!tg_pt_gp_mem)
730 return 0;
731
732 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
733 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
734 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
735 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
736 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
737 /*
738 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
739 * statement so the compiler knows explicitly to check this case first.
740 * For the Optimized ALUA access state case, we want to process the
741 * incoming fabric cmd ASAP..
742 */
743 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
744 return 0;
745
746 switch (out_alua_state) {
747 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
748 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
749 break;
750 case ALUA_ACCESS_STATE_STANDBY:
751 if (core_alua_state_standby(cmd, cdb))
752 return TCM_CHECK_CONDITION_NOT_READY;
753 break;
754 case ALUA_ACCESS_STATE_UNAVAILABLE:
755 if (core_alua_state_unavailable(cmd, cdb))
756 return TCM_CHECK_CONDITION_NOT_READY;
757 break;
758 case ALUA_ACCESS_STATE_TRANSITION:
759 if (core_alua_state_transition(cmd, cdb))
760 return TCM_CHECK_CONDITION_NOT_READY;
761 break;
762 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
763 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
764 return TCM_CHECK_CONDITION_NOT_READY;
765 break;
766 /*
767 * OFFLINE is a secondary ALUA target port group access state, that is
768 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
769 */
770 case ALUA_ACCESS_STATE_OFFLINE:
771 default:
772 pr_err("Unknown ALUA access state: 0x%02x\n",
773 out_alua_state);
774 return TCM_INVALID_CDB_FIELD;
775 }
776
777 return 0;
778 }
779
780 /*
781 * Check implicit and explicit ALUA state change request.
782 */
783 static sense_reason_t
core_alua_check_transition(int state,int valid,int * primary)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
core_alua_dump_state(int state)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
core_alua_dump_status(int status)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 */
core_alua_check_nonop_delay(struct se_cmd * cmd)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 */
core_alua_write_tpg_metadata(const char * path,unsigned char * md_buf,u32 md_buf_len)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 */
core_alua_update_tpg_primary_metadata(struct t10_alua_tg_pt_gp * tg_pt_gp)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
core_alua_do_transition_tg_pt_work(struct work_struct * work)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_mb(&mem->tg_pt_gp_mem_ref_cnt);
1000 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1001
1002 spin_lock_bh(&port->sep_alua_lock);
1003 list_for_each_entry(se_deve, &port->sep_alua_list,
1004 alua_port_list) {
1005 lacl = se_deve->se_lun_acl;
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
core_alua_do_transition_tg_pt(struct t10_alua_tg_pt_gp * tg_pt_gp,int new_state,int explicit)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 schedule_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work,
1130 transition_tmo);
1131 } else {
1132 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1133 schedule_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work, 0);
1134 wait_for_completion(&wait);
1135 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1136 }
1137
1138 return 0;
1139 }
1140
core_alua_do_port_transition(struct t10_alua_tg_pt_gp * l_tg_pt_gp,struct se_device * l_dev,struct se_port * l_port,struct se_node_acl * l_nacl,int new_state,int explicit)1141 int core_alua_do_port_transition(
1142 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1143 struct se_device *l_dev,
1144 struct se_port *l_port,
1145 struct se_node_acl *l_nacl,
1146 int new_state,
1147 int explicit)
1148 {
1149 struct se_device *dev;
1150 struct t10_alua_lu_gp *lu_gp;
1151 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1152 struct t10_alua_tg_pt_gp *tg_pt_gp;
1153 int primary, valid_states, rc = 0;
1154
1155 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1156 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1157 return -EINVAL;
1158
1159 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1160 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1161 lu_gp = local_lu_gp_mem->lu_gp;
1162 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1163 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1164 /*
1165 * For storage objects that are members of the 'default_lu_gp',
1166 * we only do transition on the passed *l_tp_pt_gp, and not
1167 * on all of the matching target port groups IDs in default_lu_gp.
1168 */
1169 if (!lu_gp->lu_gp_id) {
1170 /*
1171 * core_alua_do_transition_tg_pt() will always return
1172 * success.
1173 */
1174 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1175 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1176 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1177 new_state, explicit);
1178 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1179 return rc;
1180 }
1181 /*
1182 * For all other LU groups aside from 'default_lu_gp', walk all of
1183 * the associated storage objects looking for a matching target port
1184 * group ID from the local target port group.
1185 */
1186 spin_lock(&lu_gp->lu_gp_lock);
1187 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1188 lu_gp_mem_list) {
1189
1190 dev = lu_gp_mem->lu_gp_mem_dev;
1191 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1192 spin_unlock(&lu_gp->lu_gp_lock);
1193
1194 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1195 list_for_each_entry(tg_pt_gp,
1196 &dev->t10_alua.tg_pt_gps_list,
1197 tg_pt_gp_list) {
1198
1199 if (!tg_pt_gp->tg_pt_gp_valid_id)
1200 continue;
1201 /*
1202 * If the target behavior port asymmetric access state
1203 * is changed for any target port group accessible via
1204 * a logical unit within a LU group, the target port
1205 * behavior group asymmetric access states for the same
1206 * target port group accessible via other logical units
1207 * in that LU group will also change.
1208 */
1209 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1210 continue;
1211
1212 if (l_tg_pt_gp == tg_pt_gp) {
1213 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1214 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1215 } else {
1216 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1217 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1218 }
1219 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1220 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1221 /*
1222 * core_alua_do_transition_tg_pt() will always return
1223 * success.
1224 */
1225 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1226 new_state, explicit);
1227
1228 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1229 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1230 if (rc)
1231 break;
1232 }
1233 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1234
1235 spin_lock(&lu_gp->lu_gp_lock);
1236 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1237 }
1238 spin_unlock(&lu_gp->lu_gp_lock);
1239
1240 if (!rc) {
1241 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1242 " Group IDs: %hu %s transition to primary state: %s\n",
1243 config_item_name(&lu_gp->lu_gp_group.cg_item),
1244 l_tg_pt_gp->tg_pt_gp_id,
1245 (explicit) ? "explicit" : "implicit",
1246 core_alua_dump_state(new_state));
1247 }
1248
1249 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1250 return rc;
1251 }
1252
1253 /*
1254 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1255 */
core_alua_update_tpg_secondary_metadata(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct se_port * port)1256 static int core_alua_update_tpg_secondary_metadata(
1257 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1258 struct se_port *port)
1259 {
1260 unsigned char *md_buf;
1261 struct se_portal_group *se_tpg = port->sep_tpg;
1262 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1263 int len, rc;
1264
1265 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1266 if (!md_buf) {
1267 pr_err("Unable to allocate buf for ALUA metadata\n");
1268 return -ENOMEM;
1269 }
1270
1271 memset(path, 0, ALUA_METADATA_PATH_LEN);
1272 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1273
1274 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1275 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1276
1277 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1278 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1279 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1280
1281 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1282 "alua_tg_pt_status=0x%02x\n",
1283 atomic_read(&port->sep_tg_pt_secondary_offline),
1284 port->sep_tg_pt_secondary_stat);
1285
1286 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1287 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1288 port->sep_lun->unpacked_lun);
1289
1290 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1291 kfree(md_buf);
1292
1293 return rc;
1294 }
1295
core_alua_set_tg_pt_secondary_state(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct se_port * port,int explicit,int offline)1296 static int core_alua_set_tg_pt_secondary_state(
1297 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1298 struct se_port *port,
1299 int explicit,
1300 int offline)
1301 {
1302 struct t10_alua_tg_pt_gp *tg_pt_gp;
1303 int trans_delay_msecs;
1304
1305 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1306 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1307 if (!tg_pt_gp) {
1308 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1309 pr_err("Unable to complete secondary state"
1310 " transition\n");
1311 return -EINVAL;
1312 }
1313 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1314 /*
1315 * Set the secondary ALUA target port access state to OFFLINE
1316 * or release the previously secondary state for struct se_port
1317 */
1318 if (offline)
1319 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1320 else
1321 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1322
1323 port->sep_tg_pt_secondary_stat = (explicit) ?
1324 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1325 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1326
1327 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1328 " to secondary access state: %s\n", (explicit) ? "explicit" :
1329 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1330 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1331
1332 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1333 /*
1334 * Do the optional transition delay after we set the secondary
1335 * ALUA access state.
1336 */
1337 if (trans_delay_msecs != 0)
1338 msleep_interruptible(trans_delay_msecs);
1339 /*
1340 * See if we need to update the ALUA fabric port metadata for
1341 * secondary state and status
1342 */
1343 if (port->sep_tg_pt_secondary_write_md) {
1344 mutex_lock(&port->sep_tg_pt_md_mutex);
1345 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1346 mutex_unlock(&port->sep_tg_pt_md_mutex);
1347 }
1348
1349 return 0;
1350 }
1351
1352 struct t10_alua_lba_map *
core_alua_allocate_lba_map(struct list_head * list,u64 first_lba,u64 last_lba)1353 core_alua_allocate_lba_map(struct list_head *list,
1354 u64 first_lba, u64 last_lba)
1355 {
1356 struct t10_alua_lba_map *lba_map;
1357
1358 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1359 if (!lba_map) {
1360 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1361 return ERR_PTR(-ENOMEM);
1362 }
1363 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1364 lba_map->lba_map_first_lba = first_lba;
1365 lba_map->lba_map_last_lba = last_lba;
1366
1367 list_add_tail(&lba_map->lba_map_list, list);
1368 return lba_map;
1369 }
1370
1371 int
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map * lba_map,int pg_id,int state)1372 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1373 int pg_id, int state)
1374 {
1375 struct t10_alua_lba_map_member *lba_map_mem;
1376
1377 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1378 lba_map_mem_list) {
1379 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1380 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1381 return -EINVAL;
1382 }
1383 }
1384
1385 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1386 if (!lba_map_mem) {
1387 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1388 return -ENOMEM;
1389 }
1390 lba_map_mem->lba_map_mem_alua_state = state;
1391 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1392
1393 list_add_tail(&lba_map_mem->lba_map_mem_list,
1394 &lba_map->lba_map_mem_list);
1395 return 0;
1396 }
1397
1398 void
core_alua_free_lba_map(struct list_head * lba_list)1399 core_alua_free_lba_map(struct list_head *lba_list)
1400 {
1401 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1402 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1403
1404 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1405 lba_map_list) {
1406 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1407 &lba_map->lba_map_mem_list,
1408 lba_map_mem_list) {
1409 list_del(&lba_map_mem->lba_map_mem_list);
1410 kmem_cache_free(t10_alua_lba_map_mem_cache,
1411 lba_map_mem);
1412 }
1413 list_del(&lba_map->lba_map_list);
1414 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1415 }
1416 }
1417
1418 void
core_alua_set_lba_map(struct se_device * dev,struct list_head * lba_map_list,int segment_size,int segment_mult)1419 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1420 int segment_size, int segment_mult)
1421 {
1422 struct list_head old_lba_map_list;
1423 struct t10_alua_tg_pt_gp *tg_pt_gp;
1424 int activate = 0, supported;
1425
1426 INIT_LIST_HEAD(&old_lba_map_list);
1427 spin_lock(&dev->t10_alua.lba_map_lock);
1428 dev->t10_alua.lba_map_segment_size = segment_size;
1429 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1430 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1431 if (lba_map_list) {
1432 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1433 activate = 1;
1434 }
1435 spin_unlock(&dev->t10_alua.lba_map_lock);
1436 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1437 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1438 tg_pt_gp_list) {
1439
1440 if (!tg_pt_gp->tg_pt_gp_valid_id)
1441 continue;
1442 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1443 if (activate)
1444 supported |= ALUA_LBD_SUP;
1445 else
1446 supported &= ~ALUA_LBD_SUP;
1447 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1448 }
1449 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1450 core_alua_free_lba_map(&old_lba_map_list);
1451 }
1452
1453 struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char * name,int def_group)1454 core_alua_allocate_lu_gp(const char *name, int def_group)
1455 {
1456 struct t10_alua_lu_gp *lu_gp;
1457
1458 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1459 if (!lu_gp) {
1460 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1461 return ERR_PTR(-ENOMEM);
1462 }
1463 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1464 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1465 spin_lock_init(&lu_gp->lu_gp_lock);
1466 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1467
1468 if (def_group) {
1469 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1470 lu_gp->lu_gp_valid_id = 1;
1471 alua_lu_gps_count++;
1472 }
1473
1474 return lu_gp;
1475 }
1476
core_alua_set_lu_gp_id(struct t10_alua_lu_gp * lu_gp,u16 lu_gp_id)1477 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1478 {
1479 struct t10_alua_lu_gp *lu_gp_tmp;
1480 u16 lu_gp_id_tmp;
1481 /*
1482 * The lu_gp->lu_gp_id may only be set once..
1483 */
1484 if (lu_gp->lu_gp_valid_id) {
1485 pr_warn("ALUA LU Group already has a valid ID,"
1486 " ignoring request\n");
1487 return -EINVAL;
1488 }
1489
1490 spin_lock(&lu_gps_lock);
1491 if (alua_lu_gps_count == 0x0000ffff) {
1492 pr_err("Maximum ALUA alua_lu_gps_count:"
1493 " 0x0000ffff reached\n");
1494 spin_unlock(&lu_gps_lock);
1495 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1496 return -ENOSPC;
1497 }
1498 again:
1499 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1500 alua_lu_gps_counter++;
1501
1502 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1503 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1504 if (!lu_gp_id)
1505 goto again;
1506
1507 pr_warn("ALUA Logical Unit Group ID: %hu"
1508 " already exists, ignoring request\n",
1509 lu_gp_id);
1510 spin_unlock(&lu_gps_lock);
1511 return -EINVAL;
1512 }
1513 }
1514
1515 lu_gp->lu_gp_id = lu_gp_id_tmp;
1516 lu_gp->lu_gp_valid_id = 1;
1517 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1518 alua_lu_gps_count++;
1519 spin_unlock(&lu_gps_lock);
1520
1521 return 0;
1522 }
1523
1524 static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device * dev)1525 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1526 {
1527 struct t10_alua_lu_gp_member *lu_gp_mem;
1528
1529 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1530 if (!lu_gp_mem) {
1531 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1532 return ERR_PTR(-ENOMEM);
1533 }
1534 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1535 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1536 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1537
1538 lu_gp_mem->lu_gp_mem_dev = dev;
1539 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1540
1541 return lu_gp_mem;
1542 }
1543
core_alua_free_lu_gp(struct t10_alua_lu_gp * lu_gp)1544 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1545 {
1546 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1547 /*
1548 * Once we have reached this point, config_item_put() has
1549 * already been called from target_core_alua_drop_lu_gp().
1550 *
1551 * Here, we remove the *lu_gp from the global list so that
1552 * no associations can be made while we are releasing
1553 * struct t10_alua_lu_gp.
1554 */
1555 spin_lock(&lu_gps_lock);
1556 list_del(&lu_gp->lu_gp_node);
1557 alua_lu_gps_count--;
1558 spin_unlock(&lu_gps_lock);
1559 /*
1560 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1561 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1562 * released with core_alua_put_lu_gp_from_name()
1563 */
1564 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1565 cpu_relax();
1566 /*
1567 * Release reference to struct t10_alua_lu_gp * from all associated
1568 * struct se_device.
1569 */
1570 spin_lock(&lu_gp->lu_gp_lock);
1571 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1572 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1573 if (lu_gp_mem->lu_gp_assoc) {
1574 list_del(&lu_gp_mem->lu_gp_mem_list);
1575 lu_gp->lu_gp_members--;
1576 lu_gp_mem->lu_gp_assoc = 0;
1577 }
1578 spin_unlock(&lu_gp->lu_gp_lock);
1579 /*
1580 *
1581 * lu_gp_mem is associated with a single
1582 * struct se_device->dev_alua_lu_gp_mem, and is released when
1583 * struct se_device is released via core_alua_free_lu_gp_mem().
1584 *
1585 * If the passed lu_gp does NOT match the default_lu_gp, assume
1586 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1587 */
1588 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1589 if (lu_gp != default_lu_gp)
1590 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1591 default_lu_gp);
1592 else
1593 lu_gp_mem->lu_gp = NULL;
1594 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1595
1596 spin_lock(&lu_gp->lu_gp_lock);
1597 }
1598 spin_unlock(&lu_gp->lu_gp_lock);
1599
1600 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1601 }
1602
core_alua_free_lu_gp_mem(struct se_device * dev)1603 void core_alua_free_lu_gp_mem(struct se_device *dev)
1604 {
1605 struct t10_alua_lu_gp *lu_gp;
1606 struct t10_alua_lu_gp_member *lu_gp_mem;
1607
1608 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1609 if (!lu_gp_mem)
1610 return;
1611
1612 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1613 cpu_relax();
1614
1615 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1616 lu_gp = lu_gp_mem->lu_gp;
1617 if (lu_gp) {
1618 spin_lock(&lu_gp->lu_gp_lock);
1619 if (lu_gp_mem->lu_gp_assoc) {
1620 list_del(&lu_gp_mem->lu_gp_mem_list);
1621 lu_gp->lu_gp_members--;
1622 lu_gp_mem->lu_gp_assoc = 0;
1623 }
1624 spin_unlock(&lu_gp->lu_gp_lock);
1625 lu_gp_mem->lu_gp = NULL;
1626 }
1627 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1628
1629 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1630 }
1631
core_alua_get_lu_gp_by_name(const char * name)1632 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1633 {
1634 struct t10_alua_lu_gp *lu_gp;
1635 struct config_item *ci;
1636
1637 spin_lock(&lu_gps_lock);
1638 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1639 if (!lu_gp->lu_gp_valid_id)
1640 continue;
1641 ci = &lu_gp->lu_gp_group.cg_item;
1642 if (!strcmp(config_item_name(ci), name)) {
1643 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1644 spin_unlock(&lu_gps_lock);
1645 return lu_gp;
1646 }
1647 }
1648 spin_unlock(&lu_gps_lock);
1649
1650 return NULL;
1651 }
1652
core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp * lu_gp)1653 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1654 {
1655 spin_lock(&lu_gps_lock);
1656 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1657 spin_unlock(&lu_gps_lock);
1658 }
1659
1660 /*
1661 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1662 */
__core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1663 void __core_alua_attach_lu_gp_mem(
1664 struct t10_alua_lu_gp_member *lu_gp_mem,
1665 struct t10_alua_lu_gp *lu_gp)
1666 {
1667 spin_lock(&lu_gp->lu_gp_lock);
1668 lu_gp_mem->lu_gp = lu_gp;
1669 lu_gp_mem->lu_gp_assoc = 1;
1670 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1671 lu_gp->lu_gp_members++;
1672 spin_unlock(&lu_gp->lu_gp_lock);
1673 }
1674
1675 /*
1676 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1677 */
__core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1678 void __core_alua_drop_lu_gp_mem(
1679 struct t10_alua_lu_gp_member *lu_gp_mem,
1680 struct t10_alua_lu_gp *lu_gp)
1681 {
1682 spin_lock(&lu_gp->lu_gp_lock);
1683 list_del(&lu_gp_mem->lu_gp_mem_list);
1684 lu_gp_mem->lu_gp = NULL;
1685 lu_gp_mem->lu_gp_assoc = 0;
1686 lu_gp->lu_gp_members--;
1687 spin_unlock(&lu_gp->lu_gp_lock);
1688 }
1689
core_alua_allocate_tg_pt_gp(struct se_device * dev,const char * name,int def_group)1690 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1691 const char *name, int def_group)
1692 {
1693 struct t10_alua_tg_pt_gp *tg_pt_gp;
1694
1695 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1696 if (!tg_pt_gp) {
1697 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1698 return NULL;
1699 }
1700 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1701 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1702 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1703 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1704 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1705 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1706 core_alua_do_transition_tg_pt_work);
1707 tg_pt_gp->tg_pt_gp_dev = dev;
1708 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1709 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1710 /*
1711 * Enable both explicit and implicit ALUA support by default
1712 */
1713 tg_pt_gp->tg_pt_gp_alua_access_type =
1714 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1715 /*
1716 * Set the default Active/NonOptimized Delay in milliseconds
1717 */
1718 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1719 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1720 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1721
1722 /*
1723 * Enable all supported states
1724 */
1725 tg_pt_gp->tg_pt_gp_alua_supported_states =
1726 ALUA_T_SUP | ALUA_O_SUP |
1727 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1728
1729 if (def_group) {
1730 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1731 tg_pt_gp->tg_pt_gp_id =
1732 dev->t10_alua.alua_tg_pt_gps_counter++;
1733 tg_pt_gp->tg_pt_gp_valid_id = 1;
1734 dev->t10_alua.alua_tg_pt_gps_count++;
1735 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1736 &dev->t10_alua.tg_pt_gps_list);
1737 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1738 }
1739
1740 return tg_pt_gp;
1741 }
1742
core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp * tg_pt_gp,u16 tg_pt_gp_id)1743 int core_alua_set_tg_pt_gp_id(
1744 struct t10_alua_tg_pt_gp *tg_pt_gp,
1745 u16 tg_pt_gp_id)
1746 {
1747 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1748 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1749 u16 tg_pt_gp_id_tmp;
1750
1751 /*
1752 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1753 */
1754 if (tg_pt_gp->tg_pt_gp_valid_id) {
1755 pr_warn("ALUA TG PT Group already has a valid ID,"
1756 " ignoring request\n");
1757 return -EINVAL;
1758 }
1759
1760 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1761 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1762 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1763 " 0x0000ffff reached\n");
1764 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1765 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1766 return -ENOSPC;
1767 }
1768 again:
1769 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1770 dev->t10_alua.alua_tg_pt_gps_counter++;
1771
1772 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1773 tg_pt_gp_list) {
1774 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1775 if (!tg_pt_gp_id)
1776 goto again;
1777
1778 pr_err("ALUA Target Port Group ID: %hu already"
1779 " exists, ignoring request\n", tg_pt_gp_id);
1780 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1781 return -EINVAL;
1782 }
1783 }
1784
1785 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1786 tg_pt_gp->tg_pt_gp_valid_id = 1;
1787 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1788 &dev->t10_alua.tg_pt_gps_list);
1789 dev->t10_alua.alua_tg_pt_gps_count++;
1790 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1791
1792 return 0;
1793 }
1794
core_alua_allocate_tg_pt_gp_mem(struct se_port * port)1795 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1796 struct se_port *port)
1797 {
1798 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1799
1800 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1801 GFP_KERNEL);
1802 if (!tg_pt_gp_mem) {
1803 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1804 return ERR_PTR(-ENOMEM);
1805 }
1806 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1807 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1808 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1809
1810 tg_pt_gp_mem->tg_pt = port;
1811 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1812
1813 return tg_pt_gp_mem;
1814 }
1815
core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp * tg_pt_gp)1816 void core_alua_free_tg_pt_gp(
1817 struct t10_alua_tg_pt_gp *tg_pt_gp)
1818 {
1819 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1820 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1821
1822 /*
1823 * Once we have reached this point, config_item_put() has already
1824 * been called from target_core_alua_drop_tg_pt_gp().
1825 *
1826 * Here we remove *tg_pt_gp from the global list so that
1827 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1828 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1829 */
1830 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1831 list_del(&tg_pt_gp->tg_pt_gp_list);
1832 dev->t10_alua.alua_tg_pt_gps_counter--;
1833 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1834
1835 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1836
1837 /*
1838 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1839 * core_alua_get_tg_pt_gp_by_name() in
1840 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1841 * to be released with core_alua_put_tg_pt_gp_from_name().
1842 */
1843 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1844 cpu_relax();
1845
1846 /*
1847 * Release reference to struct t10_alua_tg_pt_gp from all associated
1848 * struct se_port.
1849 */
1850 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1851 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1852 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1853 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1854 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1855 tg_pt_gp->tg_pt_gp_members--;
1856 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1857 }
1858 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1859 /*
1860 * tg_pt_gp_mem is associated with a single
1861 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1862 * core_alua_free_tg_pt_gp_mem().
1863 *
1864 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1865 * assume we want to re-associate a given tg_pt_gp_mem with
1866 * default_tg_pt_gp.
1867 */
1868 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1869 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1870 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1871 dev->t10_alua.default_tg_pt_gp);
1872 } else
1873 tg_pt_gp_mem->tg_pt_gp = NULL;
1874 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1875
1876 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1877 }
1878 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1879
1880 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1881 }
1882
core_alua_free_tg_pt_gp_mem(struct se_port * port)1883 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1884 {
1885 struct t10_alua_tg_pt_gp *tg_pt_gp;
1886 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1887
1888 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1889 if (!tg_pt_gp_mem)
1890 return;
1891
1892 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1893 cpu_relax();
1894
1895 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1896 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1897 if (tg_pt_gp) {
1898 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1899 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1900 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1901 tg_pt_gp->tg_pt_gp_members--;
1902 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1903 }
1904 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1905 tg_pt_gp_mem->tg_pt_gp = NULL;
1906 }
1907 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1908
1909 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1910 }
1911
core_alua_get_tg_pt_gp_by_name(struct se_device * dev,const char * name)1912 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1913 struct se_device *dev, const char *name)
1914 {
1915 struct t10_alua_tg_pt_gp *tg_pt_gp;
1916 struct config_item *ci;
1917
1918 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1919 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1920 tg_pt_gp_list) {
1921 if (!tg_pt_gp->tg_pt_gp_valid_id)
1922 continue;
1923 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1924 if (!strcmp(config_item_name(ci), name)) {
1925 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1926 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1927 return tg_pt_gp;
1928 }
1929 }
1930 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1931
1932 return NULL;
1933 }
1934
core_alua_put_tg_pt_gp_from_name(struct t10_alua_tg_pt_gp * tg_pt_gp)1935 static void core_alua_put_tg_pt_gp_from_name(
1936 struct t10_alua_tg_pt_gp *tg_pt_gp)
1937 {
1938 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1939
1940 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1941 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1942 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1943 }
1944
1945 /*
1946 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1947 */
__core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct t10_alua_tg_pt_gp * tg_pt_gp)1948 void __core_alua_attach_tg_pt_gp_mem(
1949 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1950 struct t10_alua_tg_pt_gp *tg_pt_gp)
1951 {
1952 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1953 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1954 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1955 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1956 &tg_pt_gp->tg_pt_gp_mem_list);
1957 tg_pt_gp->tg_pt_gp_members++;
1958 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1959 }
1960
1961 /*
1962 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1963 */
__core_alua_drop_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct t10_alua_tg_pt_gp * tg_pt_gp)1964 static void __core_alua_drop_tg_pt_gp_mem(
1965 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1966 struct t10_alua_tg_pt_gp *tg_pt_gp)
1967 {
1968 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1969 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1970 tg_pt_gp_mem->tg_pt_gp = NULL;
1971 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1972 tg_pt_gp->tg_pt_gp_members--;
1973 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1974 }
1975
core_alua_show_tg_pt_gp_info(struct se_port * port,char * page)1976 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1977 {
1978 struct config_item *tg_pt_ci;
1979 struct t10_alua_tg_pt_gp *tg_pt_gp;
1980 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1981 ssize_t len = 0;
1982
1983 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1984 if (!tg_pt_gp_mem)
1985 return len;
1986
1987 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1988 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1989 if (tg_pt_gp) {
1990 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1991 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1992 " %hu\nTG Port Primary Access State: %s\nTG Port "
1993 "Primary Access Status: %s\nTG Port Secondary Access"
1994 " State: %s\nTG Port Secondary Access Status: %s\n",
1995 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1996 core_alua_dump_state(atomic_read(
1997 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1998 core_alua_dump_status(
1999 tg_pt_gp->tg_pt_gp_alua_access_status),
2000 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2001 "Offline" : "None",
2002 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2003 }
2004 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2005
2006 return len;
2007 }
2008
core_alua_store_tg_pt_gp_info(struct se_port * port,const char * page,size_t count)2009 ssize_t core_alua_store_tg_pt_gp_info(
2010 struct se_port *port,
2011 const char *page,
2012 size_t count)
2013 {
2014 struct se_portal_group *tpg;
2015 struct se_lun *lun;
2016 struct se_device *dev = port->sep_lun->lun_se_dev;
2017 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2018 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2019 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2020 int move = 0;
2021
2022 tpg = port->sep_tpg;
2023 lun = port->sep_lun;
2024
2025 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2026 if (!tg_pt_gp_mem)
2027 return 0;
2028
2029 if (count > TG_PT_GROUP_NAME_BUF) {
2030 pr_err("ALUA Target Port Group alias too large!\n");
2031 return -EINVAL;
2032 }
2033 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2034 memcpy(buf, page, count);
2035 /*
2036 * Any ALUA target port group alias besides "NULL" means we will be
2037 * making a new group association.
2038 */
2039 if (strcmp(strstrip(buf), "NULL")) {
2040 /*
2041 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2042 * struct t10_alua_tg_pt_gp. This reference is released with
2043 * core_alua_put_tg_pt_gp_from_name() below.
2044 */
2045 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2046 strstrip(buf));
2047 if (!tg_pt_gp_new)
2048 return -ENODEV;
2049 }
2050
2051 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2052 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2053 if (tg_pt_gp) {
2054 /*
2055 * Clearing an existing tg_pt_gp association, and replacing
2056 * with the default_tg_pt_gp.
2057 */
2058 if (!tg_pt_gp_new) {
2059 pr_debug("Target_Core_ConfigFS: Moving"
2060 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2061 " alua/%s, ID: %hu back to"
2062 " default_tg_pt_gp\n",
2063 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2064 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2065 config_item_name(&lun->lun_group.cg_item),
2066 config_item_name(
2067 &tg_pt_gp->tg_pt_gp_group.cg_item),
2068 tg_pt_gp->tg_pt_gp_id);
2069
2070 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2071 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2072 dev->t10_alua.default_tg_pt_gp);
2073 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2074
2075 return count;
2076 }
2077 /*
2078 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2079 */
2080 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2081 move = 1;
2082 }
2083 /*
2084 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2085 */
2086 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2087 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2088 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2089 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2090 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2091 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2092 config_item_name(&lun->lun_group.cg_item),
2093 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2094 tg_pt_gp_new->tg_pt_gp_id);
2095
2096 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2097 return count;
2098 }
2099
core_alua_show_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2100 ssize_t core_alua_show_access_type(
2101 struct t10_alua_tg_pt_gp *tg_pt_gp,
2102 char *page)
2103 {
2104 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2105 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2106 return sprintf(page, "Implicit and Explicit\n");
2107 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2108 return sprintf(page, "Implicit\n");
2109 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2110 return sprintf(page, "Explicit\n");
2111 else
2112 return sprintf(page, "None\n");
2113 }
2114
core_alua_store_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2115 ssize_t core_alua_store_access_type(
2116 struct t10_alua_tg_pt_gp *tg_pt_gp,
2117 const char *page,
2118 size_t count)
2119 {
2120 unsigned long tmp;
2121 int ret;
2122
2123 ret = kstrtoul(page, 0, &tmp);
2124 if (ret < 0) {
2125 pr_err("Unable to extract alua_access_type\n");
2126 return ret;
2127 }
2128 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2129 pr_err("Illegal value for alua_access_type:"
2130 " %lu\n", tmp);
2131 return -EINVAL;
2132 }
2133 if (tmp == 3)
2134 tg_pt_gp->tg_pt_gp_alua_access_type =
2135 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2136 else if (tmp == 2)
2137 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2138 else if (tmp == 1)
2139 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2140 else
2141 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2142
2143 return count;
2144 }
2145
core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2146 ssize_t core_alua_show_nonop_delay_msecs(
2147 struct t10_alua_tg_pt_gp *tg_pt_gp,
2148 char *page)
2149 {
2150 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2151 }
2152
core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2153 ssize_t core_alua_store_nonop_delay_msecs(
2154 struct t10_alua_tg_pt_gp *tg_pt_gp,
2155 const char *page,
2156 size_t count)
2157 {
2158 unsigned long tmp;
2159 int ret;
2160
2161 ret = kstrtoul(page, 0, &tmp);
2162 if (ret < 0) {
2163 pr_err("Unable to extract nonop_delay_msecs\n");
2164 return ret;
2165 }
2166 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2167 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2168 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2169 ALUA_MAX_NONOP_DELAY_MSECS);
2170 return -EINVAL;
2171 }
2172 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2173
2174 return count;
2175 }
2176
core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2177 ssize_t core_alua_show_trans_delay_msecs(
2178 struct t10_alua_tg_pt_gp *tg_pt_gp,
2179 char *page)
2180 {
2181 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2182 }
2183
core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2184 ssize_t core_alua_store_trans_delay_msecs(
2185 struct t10_alua_tg_pt_gp *tg_pt_gp,
2186 const char *page,
2187 size_t count)
2188 {
2189 unsigned long tmp;
2190 int ret;
2191
2192 ret = kstrtoul(page, 0, &tmp);
2193 if (ret < 0) {
2194 pr_err("Unable to extract trans_delay_msecs\n");
2195 return ret;
2196 }
2197 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2198 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2199 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2200 ALUA_MAX_TRANS_DELAY_MSECS);
2201 return -EINVAL;
2202 }
2203 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2204
2205 return count;
2206 }
2207
core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2208 ssize_t core_alua_show_implicit_trans_secs(
2209 struct t10_alua_tg_pt_gp *tg_pt_gp,
2210 char *page)
2211 {
2212 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2213 }
2214
core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2215 ssize_t core_alua_store_implicit_trans_secs(
2216 struct t10_alua_tg_pt_gp *tg_pt_gp,
2217 const char *page,
2218 size_t count)
2219 {
2220 unsigned long tmp;
2221 int ret;
2222
2223 ret = kstrtoul(page, 0, &tmp);
2224 if (ret < 0) {
2225 pr_err("Unable to extract implicit_trans_secs\n");
2226 return ret;
2227 }
2228 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2229 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2230 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2231 ALUA_MAX_IMPLICIT_TRANS_SECS);
2232 return -EINVAL;
2233 }
2234 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2235
2236 return count;
2237 }
2238
core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2239 ssize_t core_alua_show_preferred_bit(
2240 struct t10_alua_tg_pt_gp *tg_pt_gp,
2241 char *page)
2242 {
2243 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2244 }
2245
core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2246 ssize_t core_alua_store_preferred_bit(
2247 struct t10_alua_tg_pt_gp *tg_pt_gp,
2248 const char *page,
2249 size_t count)
2250 {
2251 unsigned long tmp;
2252 int ret;
2253
2254 ret = kstrtoul(page, 0, &tmp);
2255 if (ret < 0) {
2256 pr_err("Unable to extract preferred ALUA value\n");
2257 return ret;
2258 }
2259 if ((tmp != 0) && (tmp != 1)) {
2260 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2261 return -EINVAL;
2262 }
2263 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2264
2265 return count;
2266 }
2267
core_alua_show_offline_bit(struct se_lun * lun,char * page)2268 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2269 {
2270 if (!lun->lun_sep)
2271 return -ENODEV;
2272
2273 return sprintf(page, "%d\n",
2274 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2275 }
2276
core_alua_store_offline_bit(struct se_lun * lun,const char * page,size_t count)2277 ssize_t core_alua_store_offline_bit(
2278 struct se_lun *lun,
2279 const char *page,
2280 size_t count)
2281 {
2282 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2283 unsigned long tmp;
2284 int ret;
2285
2286 if (!lun->lun_sep)
2287 return -ENODEV;
2288
2289 ret = kstrtoul(page, 0, &tmp);
2290 if (ret < 0) {
2291 pr_err("Unable to extract alua_tg_pt_offline value\n");
2292 return ret;
2293 }
2294 if ((tmp != 0) && (tmp != 1)) {
2295 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2296 tmp);
2297 return -EINVAL;
2298 }
2299 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2300 if (!tg_pt_gp_mem) {
2301 pr_err("Unable to locate *tg_pt_gp_mem\n");
2302 return -EINVAL;
2303 }
2304
2305 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2306 lun->lun_sep, 0, (int)tmp);
2307 if (ret < 0)
2308 return -EINVAL;
2309
2310 return count;
2311 }
2312
core_alua_show_secondary_status(struct se_lun * lun,char * page)2313 ssize_t core_alua_show_secondary_status(
2314 struct se_lun *lun,
2315 char *page)
2316 {
2317 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2318 }
2319
core_alua_store_secondary_status(struct se_lun * lun,const char * page,size_t count)2320 ssize_t core_alua_store_secondary_status(
2321 struct se_lun *lun,
2322 const char *page,
2323 size_t count)
2324 {
2325 unsigned long tmp;
2326 int ret;
2327
2328 ret = kstrtoul(page, 0, &tmp);
2329 if (ret < 0) {
2330 pr_err("Unable to extract alua_tg_pt_status\n");
2331 return ret;
2332 }
2333 if ((tmp != ALUA_STATUS_NONE) &&
2334 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2335 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2336 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2337 tmp);
2338 return -EINVAL;
2339 }
2340 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2341
2342 return count;
2343 }
2344
core_alua_show_secondary_write_metadata(struct se_lun * lun,char * page)2345 ssize_t core_alua_show_secondary_write_metadata(
2346 struct se_lun *lun,
2347 char *page)
2348 {
2349 return sprintf(page, "%d\n",
2350 lun->lun_sep->sep_tg_pt_secondary_write_md);
2351 }
2352
core_alua_store_secondary_write_metadata(struct se_lun * lun,const char * page,size_t count)2353 ssize_t core_alua_store_secondary_write_metadata(
2354 struct se_lun *lun,
2355 const char *page,
2356 size_t count)
2357 {
2358 unsigned long tmp;
2359 int ret;
2360
2361 ret = kstrtoul(page, 0, &tmp);
2362 if (ret < 0) {
2363 pr_err("Unable to extract alua_tg_pt_write_md\n");
2364 return ret;
2365 }
2366 if ((tmp != 0) && (tmp != 1)) {
2367 pr_err("Illegal value for alua_tg_pt_write_md:"
2368 " %lu\n", tmp);
2369 return -EINVAL;
2370 }
2371 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2372
2373 return count;
2374 }
2375
core_setup_alua(struct se_device * dev)2376 int core_setup_alua(struct se_device *dev)
2377 {
2378 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2379 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2380 struct t10_alua_lu_gp_member *lu_gp_mem;
2381
2382 /*
2383 * Associate this struct se_device with the default ALUA
2384 * LUN Group.
2385 */
2386 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2387 if (IS_ERR(lu_gp_mem))
2388 return PTR_ERR(lu_gp_mem);
2389
2390 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2391 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2392 default_lu_gp);
2393 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2394
2395 pr_debug("%s: Adding to default ALUA LU Group:"
2396 " core/alua/lu_gps/default_lu_gp\n",
2397 dev->transport->name);
2398 }
2399
2400 return 0;
2401 }
2402