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vdso: don't require 64-bit math in standalone test
[linux-2.6/btrfs-unstable.git] / drivers / target / target_core_alua.c
blobfbc5ebb5f7613c4f7a70c5c0adfbadf27bd4cf30
1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/export.h>
30 #include <linux/file.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_configfs.h>
39
40 #include "target_core_internal.h"
41 #include "target_core_alua.h"
42 #include "target_core_ua.h"
43
44 static sense_reason_t core_alua_check_transition(int state, int valid,
45 int *primary);
46 static int core_alua_set_tg_pt_secondary_state(
47 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
48 struct se_port *port, int explicit, int offline);
49
50 static char *core_alua_dump_state(int state);
51
52 static u16 alua_lu_gps_counter;
53 static u32 alua_lu_gps_count;
54
55 static DEFINE_SPINLOCK(lu_gps_lock);
56 static LIST_HEAD(lu_gps_list);
57
58 struct t10_alua_lu_gp *default_lu_gp;
59
60 /*
61 * REPORT REFERRALS
62 *
63 * See sbc3r35 section 5.23
64 */
65 sense_reason_t
66 target_emulate_report_referrals(struct se_cmd *cmd)
67 {
68 struct se_device *dev = cmd->se_dev;
69 struct t10_alua_lba_map *map;
70 struct t10_alua_lba_map_member *map_mem;
71 unsigned char *buf;
72 u32 rd_len = 0, off;
73
74 if (cmd->data_length < 4) {
75 pr_warn("REPORT REFERRALS allocation length %u too"
76 " small\n", cmd->data_length);
77 return TCM_INVALID_CDB_FIELD;
78 }
79
80 buf = transport_kmap_data_sg(cmd);
81 if (!buf)
82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
83
84 off = 4;
85 spin_lock(&dev->t10_alua.lba_map_lock);
86 if (list_empty(&dev->t10_alua.lba_map_list)) {
87 spin_unlock(&dev->t10_alua.lba_map_lock);
88 transport_kunmap_data_sg(cmd);
89
90 return TCM_UNSUPPORTED_SCSI_OPCODE;
91 }
92
93 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
94 lba_map_list) {
95 int desc_num = off + 3;
96 int pg_num;
97
98 off += 4;
99 if (cmd->data_length > off)
100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
101 off += 8;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
104 off += 8;
105 rd_len += 20;
106 pg_num = 0;
107 list_for_each_entry(map_mem, &map->lba_map_mem_list,
108 lba_map_mem_list) {
109 int alua_state = map_mem->lba_map_mem_alua_state;
110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
111
112 if (cmd->data_length > off)
113 buf[off] = alua_state & 0x0f;
114 off += 2;
115 if (cmd->data_length > off)
116 buf[off] = (alua_pg_id >> 8) & 0xff;
117 off++;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id & 0xff);
120 off++;
121 rd_len += 4;
122 pg_num++;
123 }
124 if (cmd->data_length > desc_num)
125 buf[desc_num] = pg_num;
126 }
127 spin_unlock(&dev->t10_alua.lba_map_lock);
128
129 /*
130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
131 */
132 put_unaligned_be16(rd_len, &buf[2]);
133
134 transport_kunmap_data_sg(cmd);
135
136 target_complete_cmd(cmd, GOOD);
137 return 0;
138 }
139
140 /*
141 * REPORT_TARGET_PORT_GROUPS
142 *
143 * See spc4r17 section 6.27
144 */
145 sense_reason_t
146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 {
148 struct se_device *dev = cmd->se_dev;
149 struct se_port *port;
150 struct t10_alua_tg_pt_gp *tg_pt_gp;
151 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
152 unsigned char *buf;
153 u32 rd_len = 0, off;
154 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
155
156 /*
157 * Skip over RESERVED area to first Target port group descriptor
158 * depending on the PARAMETER DATA FORMAT type..
159 */
160 if (ext_hdr != 0)
161 off = 8;
162 else
163 off = 4;
164
165 if (cmd->data_length < off) {
166 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
167 " small for %s header\n", cmd->data_length,
168 (ext_hdr) ? "extended" : "normal");
169 return TCM_INVALID_CDB_FIELD;
170 }
171 buf = transport_kmap_data_sg(cmd);
172 if (!buf)
173 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
174
175 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
176 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
177 tg_pt_gp_list) {
178 /*
179 * Check if the Target port group and Target port descriptor list
180 * based on tg_pt_gp_members count will fit into the response payload.
181 * Otherwise, bump rd_len to let the initiator know we have exceeded
182 * the allocation length and the response is truncated.
183 */
184 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
185 cmd->data_length) {
186 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
187 continue;
188 }
189 /*
190 * PREF: Preferred target port bit, determine if this
191 * bit should be set for port group.
192 */
193 if (tg_pt_gp->tg_pt_gp_pref)
194 buf[off] = 0x80;
195 /*
196 * Set the ASYMMETRIC ACCESS State
197 */
198 buf[off++] |= (atomic_read(
199 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
200 /*
201 * Set supported ASYMMETRIC ACCESS State bits
202 */
203 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
204 /*
205 * TARGET PORT GROUP
206 */
207 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
208 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
209
210 off++; /* Skip over Reserved */
211 /*
212 * STATUS CODE
213 */
214 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
215 /*
216 * Vendor Specific field
217 */
218 buf[off++] = 0x00;
219 /*
220 * TARGET PORT COUNT
221 */
222 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
223 rd_len += 8;
224
225 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
226 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
227 tg_pt_gp_mem_list) {
228 port = tg_pt_gp_mem->tg_pt;
229 /*
230 * Start Target Port descriptor format
231 *
232 * See spc4r17 section 6.2.7 Table 247
233 */
234 off += 2; /* Skip over Obsolete */
235 /*
236 * Set RELATIVE TARGET PORT IDENTIFIER
237 */
238 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
239 buf[off++] = (port->sep_rtpi & 0xff);
240 rd_len += 4;
241 }
242 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
243 }
244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
245 /*
246 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
247 */
248 put_unaligned_be32(rd_len, &buf[0]);
249
250 /*
251 * Fill in the Extended header parameter data format if requested
252 */
253 if (ext_hdr != 0) {
254 buf[4] = 0x10;
255 /*
256 * Set the implicit transition time (in seconds) for the application
257 * client to use as a base for it's transition timeout value.
258 *
259 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
260 * this CDB was received upon to determine this value individually
261 * for ALUA target port group.
262 */
263 port = cmd->se_lun->lun_sep;
264 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
265 if (tg_pt_gp_mem) {
266 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
267 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
268 if (tg_pt_gp)
269 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
270 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
271 }
272 }
273 transport_kunmap_data_sg(cmd);
274
275 target_complete_cmd(cmd, GOOD);
276 return 0;
277 }
278
279 /*
280 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
281 *
282 * See spc4r17 section 6.35
283 */
284 sense_reason_t
285 target_emulate_set_target_port_groups(struct se_cmd *cmd)
286 {
287 struct se_device *dev = cmd->se_dev;
288 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
289 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
290 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
291 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
292 unsigned char *buf;
293 unsigned char *ptr;
294 sense_reason_t rc = TCM_NO_SENSE;
295 u32 len = 4; /* Skip over RESERVED area in header */
296 int alua_access_state, primary = 0, valid_states;
297 u16 tg_pt_id, rtpi;
298
299 if (!l_port)
300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
301
302 if (cmd->data_length < 4) {
303 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
304 " small\n", cmd->data_length);
305 return TCM_INVALID_PARAMETER_LIST;
306 }
307
308 buf = transport_kmap_data_sg(cmd);
309 if (!buf)
310 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
311
312 /*
313 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
314 * for the local tg_pt_gp.
315 */
316 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
317 if (!l_tg_pt_gp_mem) {
318 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
319 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
320 goto out;
321 }
322 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
323 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
324 if (!l_tg_pt_gp) {
325 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
326 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
327 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
328 goto out;
329 }
330 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
331
332 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
333 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
334 " while TPGS_EXPLICIT_ALUA is disabled\n");
335 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
336 goto out;
337 }
338 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
339
340 ptr = &buf[4]; /* Skip over RESERVED area in header */
341
342 while (len < cmd->data_length) {
343 bool found = false;
344 alua_access_state = (ptr[0] & 0x0f);
345 /*
346 * Check the received ALUA access state, and determine if
347 * the state is a primary or secondary target port asymmetric
348 * access state.
349 */
350 rc = core_alua_check_transition(alua_access_state,
351 valid_states, &primary);
352 if (rc) {
353 /*
354 * If the SET TARGET PORT GROUPS attempts to establish
355 * an invalid combination of target port asymmetric
356 * access states or attempts to establish an
357 * unsupported target port asymmetric access state,
358 * then the command shall be terminated with CHECK
359 * CONDITION status, with the sense key set to ILLEGAL
360 * REQUEST, and the additional sense code set to INVALID
361 * FIELD IN PARAMETER LIST.
362 */
363 goto out;
364 }
365
366 /*
367 * If the ASYMMETRIC ACCESS STATE field (see table 267)
368 * specifies a primary target port asymmetric access state,
369 * then the TARGET PORT GROUP OR TARGET PORT field specifies
370 * a primary target port group for which the primary target
371 * port asymmetric access state shall be changed. If the
372 * ASYMMETRIC ACCESS STATE field specifies a secondary target
373 * port asymmetric access state, then the TARGET PORT GROUP OR
374 * TARGET PORT field specifies the relative target port
375 * identifier (see 3.1.120) of the target port for which the
376 * secondary target port asymmetric access state shall be
377 * changed.
378 */
379 if (primary) {
380 tg_pt_id = get_unaligned_be16(ptr + 2);
381 /*
382 * Locate the matching target port group ID from
383 * the global tg_pt_gp list
384 */
385 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
386 list_for_each_entry(tg_pt_gp,
387 &dev->t10_alua.tg_pt_gps_list,
388 tg_pt_gp_list) {
389 if (!tg_pt_gp->tg_pt_gp_valid_id)
390 continue;
391
392 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
393 continue;
394
395 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
396 smp_mb__after_atomic();
397
398 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
399
400 if (!core_alua_do_port_transition(tg_pt_gp,
401 dev, l_port, nacl,
402 alua_access_state, 1))
403 found = true;
404
405 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
406 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
407 smp_mb__after_atomic();
408 break;
409 }
410 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
411 } else {
412 /*
413 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
414 * the Target Port in question for the the incoming
415 * SET_TARGET_PORT_GROUPS op.
416 */
417 rtpi = get_unaligned_be16(ptr + 2);
418 /*
419 * Locate the matching relative target port identifier
420 * for the struct se_device storage object.
421 */
422 spin_lock(&dev->se_port_lock);
423 list_for_each_entry(port, &dev->dev_sep_list,
424 sep_list) {
425 if (port->sep_rtpi != rtpi)
426 continue;
427
428 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
429
430 spin_unlock(&dev->se_port_lock);
431
432 if (!core_alua_set_tg_pt_secondary_state(
433 tg_pt_gp_mem, port, 1, 1))
434 found = true;
435
436 spin_lock(&dev->se_port_lock);
437 break;
438 }
439 spin_unlock(&dev->se_port_lock);
440 }
441
442 if (!found) {
443 rc = TCM_INVALID_PARAMETER_LIST;
444 goto out;
445 }
446
447 ptr += 4;
448 len += 4;
449 }
450
451 out:
452 transport_kunmap_data_sg(cmd);
453 if (!rc)
454 target_complete_cmd(cmd, GOOD);
455 return rc;
456 }
457
458 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
459 {
460 /*
461 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
462 * The ALUA additional sense code qualifier (ASCQ) is determined
463 * by the ALUA primary or secondary access state..
464 */
465 pr_debug("[%s]: ALUA TG Port not available, "
466 "SenseKey: NOT_READY, ASC/ASCQ: "
467 "0x04/0x%02x\n",
468 cmd->se_tfo->get_fabric_name(), alua_ascq);
469
470 cmd->scsi_asc = 0x04;
471 cmd->scsi_ascq = alua_ascq;
472 }
473
474 static inline void core_alua_state_nonoptimized(
475 struct se_cmd *cmd,
476 unsigned char *cdb,
477 int nonop_delay_msecs)
478 {
479 /*
480 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
481 * later to determine if processing of this cmd needs to be
482 * temporarily delayed for the Active/NonOptimized primary access state.
483 */
484 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
485 cmd->alua_nonop_delay = nonop_delay_msecs;
486 }
487
488 static inline int core_alua_state_lba_dependent(
489 struct se_cmd *cmd,
490 struct t10_alua_tg_pt_gp *tg_pt_gp)
491 {
492 struct se_device *dev = cmd->se_dev;
493 u64 segment_size, segment_mult, sectors, lba;
494
495 /* Only need to check for cdb actually containing LBAs */
496 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
497 return 0;
498
499 spin_lock(&dev->t10_alua.lba_map_lock);
500 segment_size = dev->t10_alua.lba_map_segment_size;
501 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
502 sectors = cmd->data_length / dev->dev_attrib.block_size;
503
504 lba = cmd->t_task_lba;
505 while (lba < cmd->t_task_lba + sectors) {
506 struct t10_alua_lba_map *cur_map = NULL, *map;
507 struct t10_alua_lba_map_member *map_mem;
508
509 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
510 lba_map_list) {
511 u64 start_lba, last_lba;
512 u64 first_lba = map->lba_map_first_lba;
513
514 if (segment_mult) {
515 u64 tmp = lba;
516 start_lba = do_div(tmp, segment_size * segment_mult);
517
518 last_lba = first_lba + segment_size - 1;
519 if (start_lba >= first_lba &&
520 start_lba <= last_lba) {
521 lba += segment_size;
522 cur_map = map;
523 break;
524 }
525 } else {
526 last_lba = map->lba_map_last_lba;
527 if (lba >= first_lba && lba <= last_lba) {
528 lba = last_lba + 1;
529 cur_map = map;
530 break;
531 }
532 }
533 }
534 if (!cur_map) {
535 spin_unlock(&dev->t10_alua.lba_map_lock);
536 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
537 return 1;
538 }
539 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
540 lba_map_mem_list) {
541 if (map_mem->lba_map_mem_alua_pg_id !=
542 tg_pt_gp->tg_pt_gp_id)
543 continue;
544 switch(map_mem->lba_map_mem_alua_state) {
545 case ALUA_ACCESS_STATE_STANDBY:
546 spin_unlock(&dev->t10_alua.lba_map_lock);
547 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
548 return 1;
549 case ALUA_ACCESS_STATE_UNAVAILABLE:
550 spin_unlock(&dev->t10_alua.lba_map_lock);
551 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
552 return 1;
553 default:
554 break;
555 }
556 }
557 }
558 spin_unlock(&dev->t10_alua.lba_map_lock);
559 return 0;
560 }
561
562 static inline int core_alua_state_standby(
563 struct se_cmd *cmd,
564 unsigned char *cdb)
565 {
566 /*
567 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
568 * spc4r17 section 5.9.2.4.4
569 */
570 switch (cdb[0]) {
571 case INQUIRY:
572 case LOG_SELECT:
573 case LOG_SENSE:
574 case MODE_SELECT:
575 case MODE_SENSE:
576 case REPORT_LUNS:
577 case RECEIVE_DIAGNOSTIC:
578 case SEND_DIAGNOSTIC:
579 case READ_CAPACITY:
580 return 0;
581 case SERVICE_ACTION_IN:
582 switch (cdb[1] & 0x1f) {
583 case SAI_READ_CAPACITY_16:
584 return 0;
585 default:
586 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
587 return 1;
588 }
589 case MAINTENANCE_IN:
590 switch (cdb[1] & 0x1f) {
591 case MI_REPORT_TARGET_PGS:
592 return 0;
593 default:
594 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
595 return 1;
596 }
597 case MAINTENANCE_OUT:
598 switch (cdb[1]) {
599 case MO_SET_TARGET_PGS:
600 return 0;
601 default:
602 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
603 return 1;
604 }
605 case REQUEST_SENSE:
606 case PERSISTENT_RESERVE_IN:
607 case PERSISTENT_RESERVE_OUT:
608 case READ_BUFFER:
609 case WRITE_BUFFER:
610 return 0;
611 default:
612 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
613 return 1;
614 }
615
616 return 0;
617 }
618
619 static inline int core_alua_state_unavailable(
620 struct se_cmd *cmd,
621 unsigned char *cdb)
622 {
623 /*
624 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
625 * spc4r17 section 5.9.2.4.5
626 */
627 switch (cdb[0]) {
628 case INQUIRY:
629 case REPORT_LUNS:
630 return 0;
631 case MAINTENANCE_IN:
632 switch (cdb[1] & 0x1f) {
633 case MI_REPORT_TARGET_PGS:
634 return 0;
635 default:
636 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
637 return 1;
638 }
639 case MAINTENANCE_OUT:
640 switch (cdb[1]) {
641 case MO_SET_TARGET_PGS:
642 return 0;
643 default:
644 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
645 return 1;
646 }
647 case REQUEST_SENSE:
648 case READ_BUFFER:
649 case WRITE_BUFFER:
650 return 0;
651 default:
652 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
653 return 1;
654 }
655
656 return 0;
657 }
658
659 static inline int core_alua_state_transition(
660 struct se_cmd *cmd,
661 unsigned char *cdb)
662 {
663 /*
664 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
665 * spc4r17 section 5.9.2.5
666 */
667 switch (cdb[0]) {
668 case INQUIRY:
669 case REPORT_LUNS:
670 return 0;
671 case MAINTENANCE_IN:
672 switch (cdb[1] & 0x1f) {
673 case MI_REPORT_TARGET_PGS:
674 return 0;
675 default:
676 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
677 return 1;
678 }
679 case REQUEST_SENSE:
680 case READ_BUFFER:
681 case WRITE_BUFFER:
682 return 0;
683 default:
684 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
685 return 1;
686 }
687
688 return 0;
689 }
690
691 /*
692 * return 1: Is used to signal LUN not accessible, and check condition/not ready
693 * return 0: Used to signal success
694 * return -1: Used to signal failure, and invalid cdb field
695 */
696 sense_reason_t
697 target_alua_state_check(struct se_cmd *cmd)
698 {
699 struct se_device *dev = cmd->se_dev;
700 unsigned char *cdb = cmd->t_task_cdb;
701 struct se_lun *lun = cmd->se_lun;
702 struct se_port *port = lun->lun_sep;
703 struct t10_alua_tg_pt_gp *tg_pt_gp;
704 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
705 int out_alua_state, nonop_delay_msecs;
706
707 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
708 return 0;
709 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
710 return 0;
711
712 if (!port)
713 return 0;
714 /*
715 * First, check for a struct se_port specific secondary ALUA target port
716 * access state: OFFLINE
717 */
718 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
719 pr_debug("ALUA: Got secondary offline status for local"
720 " target port\n");
721 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
722 return TCM_CHECK_CONDITION_NOT_READY;
723 }
724 /*
725 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
726 * ALUA target port group, to obtain current ALUA access state.
727 * Otherwise look for the underlying struct se_device association with
728 * a ALUA logical unit group.
729 */
730 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
731 if (!tg_pt_gp_mem)
732 return 0;
733
734 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
735 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
736 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
737 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
738 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
739 /*
740 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
741 * statement so the compiler knows explicitly to check this case first.
742 * For the Optimized ALUA access state case, we want to process the
743 * incoming fabric cmd ASAP..
744 */
745 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
746 return 0;
747
748 switch (out_alua_state) {
749 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
750 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
751 break;
752 case ALUA_ACCESS_STATE_STANDBY:
753 if (core_alua_state_standby(cmd, cdb))
754 return TCM_CHECK_CONDITION_NOT_READY;
755 break;
756 case ALUA_ACCESS_STATE_UNAVAILABLE:
757 if (core_alua_state_unavailable(cmd, cdb))
758 return TCM_CHECK_CONDITION_NOT_READY;
759 break;
760 case ALUA_ACCESS_STATE_TRANSITION:
761 if (core_alua_state_transition(cmd, cdb))
762 return TCM_CHECK_CONDITION_NOT_READY;
763 break;
764 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
765 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
766 return TCM_CHECK_CONDITION_NOT_READY;
767 break;
768 /*
769 * OFFLINE is a secondary ALUA target port group access state, that is
770 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
771 */
772 case ALUA_ACCESS_STATE_OFFLINE:
773 default:
774 pr_err("Unknown ALUA access state: 0x%02x\n",
775 out_alua_state);
776 return TCM_INVALID_CDB_FIELD;
777 }
778
779 return 0;
780 }
781
782 /*
783 * Check implicit and explicit ALUA state change request.
784 */
785 static sense_reason_t
786 core_alua_check_transition(int state, int valid, int *primary)
787 {
788 /*
789 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
790 * defined as primary target port asymmetric access states.
791 */
792 switch (state) {
793 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
794 if (!(valid & ALUA_AO_SUP))
795 goto not_supported;
796 *primary = 1;
797 break;
798 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
799 if (!(valid & ALUA_AN_SUP))
800 goto not_supported;
801 *primary = 1;
802 break;
803 case ALUA_ACCESS_STATE_STANDBY:
804 if (!(valid & ALUA_S_SUP))
805 goto not_supported;
806 *primary = 1;
807 break;
808 case ALUA_ACCESS_STATE_UNAVAILABLE:
809 if (!(valid & ALUA_U_SUP))
810 goto not_supported;
811 *primary = 1;
812 break;
813 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
814 if (!(valid & ALUA_LBD_SUP))
815 goto not_supported;
816 *primary = 1;
817 break;
818 case ALUA_ACCESS_STATE_OFFLINE:
819 /*
820 * OFFLINE state is defined as a secondary target port
821 * asymmetric access state.
822 */
823 if (!(valid & ALUA_O_SUP))
824 goto not_supported;
825 *primary = 0;
826 break;
827 case ALUA_ACCESS_STATE_TRANSITION:
828 /*
829 * Transitioning is set internally, and
830 * cannot be selected manually.
831 */
832 goto not_supported;
833 default:
834 pr_err("Unknown ALUA access state: 0x%02x\n", state);
835 return TCM_INVALID_PARAMETER_LIST;
836 }
837
838 return 0;
839
840 not_supported:
841 pr_err("ALUA access state %s not supported",
842 core_alua_dump_state(state));
843 return TCM_INVALID_PARAMETER_LIST;
844 }
845
846 static char *core_alua_dump_state(int state)
847 {
848 switch (state) {
849 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
850 return "Active/Optimized";
851 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
852 return "Active/NonOptimized";
853 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
854 return "LBA Dependent";
855 case ALUA_ACCESS_STATE_STANDBY:
856 return "Standby";
857 case ALUA_ACCESS_STATE_UNAVAILABLE:
858 return "Unavailable";
859 case ALUA_ACCESS_STATE_OFFLINE:
860 return "Offline";
861 case ALUA_ACCESS_STATE_TRANSITION:
862 return "Transitioning";
863 default:
864 return "Unknown";
865 }
866
867 return NULL;
868 }
869
870 char *core_alua_dump_status(int status)
871 {
872 switch (status) {
873 case ALUA_STATUS_NONE:
874 return "None";
875 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
876 return "Altered by Explicit STPG";
877 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
878 return "Altered by Implicit ALUA";
879 default:
880 return "Unknown";
881 }
882
883 return NULL;
884 }
885
886 /*
887 * Used by fabric modules to determine when we need to delay processing
888 * for the Active/NonOptimized paths..
889 */
890 int core_alua_check_nonop_delay(
891 struct se_cmd *cmd)
892 {
893 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
894 return 0;
895 if (in_interrupt())
896 return 0;
897 /*
898 * The ALUA Active/NonOptimized access state delay can be disabled
899 * in via configfs with a value of zero
900 */
901 if (!cmd->alua_nonop_delay)
902 return 0;
903 /*
904 * struct se_cmd->alua_nonop_delay gets set by a target port group
905 * defined interval in core_alua_state_nonoptimized()
906 */
907 msleep_interruptible(cmd->alua_nonop_delay);
908 return 0;
909 }
910 EXPORT_SYMBOL(core_alua_check_nonop_delay);
911
912 /*
913 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
914 *
915 */
916 static int core_alua_write_tpg_metadata(
917 const char *path,
918 unsigned char *md_buf,
919 u32 md_buf_len)
920 {
921 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
922 int ret;
923
924 if (IS_ERR(file)) {
925 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
926 return -ENODEV;
927 }
928 ret = kernel_write(file, md_buf, md_buf_len, 0);
929 if (ret < 0)
930 pr_err("Error writing ALUA metadata file: %s\n", path);
931 fput(file);
932 return (ret < 0) ? -EIO : 0;
933 }
934
935 /*
936 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
937 */
938 static int core_alua_update_tpg_primary_metadata(
939 struct t10_alua_tg_pt_gp *tg_pt_gp)
940 {
941 unsigned char *md_buf;
942 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
943 char path[ALUA_METADATA_PATH_LEN];
944 int len, rc;
945
946 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
947 if (!md_buf) {
948 pr_err("Unable to allocate buf for ALUA metadata\n");
949 return -ENOMEM;
950 }
951
952 memset(path, 0, ALUA_METADATA_PATH_LEN);
953
954 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
955 "tg_pt_gp_id=%hu\n"
956 "alua_access_state=0x%02x\n"
957 "alua_access_status=0x%02x\n",
958 tg_pt_gp->tg_pt_gp_id,
959 tg_pt_gp->tg_pt_gp_alua_pending_state,
960 tg_pt_gp->tg_pt_gp_alua_access_status);
961
962 snprintf(path, ALUA_METADATA_PATH_LEN,
963 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
964 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
965
966 rc = core_alua_write_tpg_metadata(path, md_buf, len);
967 kfree(md_buf);
968 return rc;
969 }
970
971 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
972 {
973 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
974 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
975 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
976 struct se_dev_entry *se_deve;
977 struct se_lun_acl *lacl;
978 struct se_port *port;
979 struct t10_alua_tg_pt_gp_member *mem;
980 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
981 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
982
983 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
984 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
985 tg_pt_gp_mem_list) {
986 port = mem->tg_pt;
987 /*
988 * After an implicit target port asymmetric access state
989 * change, a device server shall establish a unit attention
990 * condition for the initiator port associated with every I_T
991 * nexus with the additional sense code set to ASYMMETRIC
992 * ACCESS STATE CHANGED.
993 *
994 * After an explicit target port asymmetric access state
995 * change, a device server shall establish a unit attention
996 * condition with the additional sense code set to ASYMMETRIC
997 * ACCESS STATE CHANGED for the initiator port associated with
998 * every I_T nexus other than the I_T nexus on which the SET
999 * TARGET PORT GROUPS command
1000 */
1001 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
1002 smp_mb__after_atomic();
1003 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1004
1005 spin_lock_bh(&port->sep_alua_lock);
1006 list_for_each_entry(se_deve, &port->sep_alua_list,
1007 alua_port_list) {
1008 lacl = se_deve->se_lun_acl;
1009 /*
1010 * se_deve->se_lun_acl pointer may be NULL for a
1011 * entry created without explicit Node+MappedLUN ACLs
1012 */
1013 if (!lacl)
1014 continue;
1015
1016 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1017 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1018 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1019 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1020 (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1021 (tg_pt_gp->tg_pt_gp_alua_port == port))
1022 continue;
1023
1024 core_scsi3_ua_allocate(lacl->se_lun_nacl,
1025 se_deve->mapped_lun, 0x2A,
1026 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1027 }
1028 spin_unlock_bh(&port->sep_alua_lock);
1029
1030 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1031 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
1032 smp_mb__after_atomic();
1033 }
1034 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1035 /*
1036 * Update the ALUA metadata buf that has been allocated in
1037 * core_alua_do_port_transition(), this metadata will be written
1038 * to struct file.
1039 *
1040 * Note that there is the case where we do not want to update the
1041 * metadata when the saved metadata is being parsed in userspace
1042 * when setting the existing port access state and access status.
1043 *
1044 * Also note that the failure to write out the ALUA metadata to
1045 * struct file does NOT affect the actual ALUA transition.
1046 */
1047 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1048 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1049 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1050 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1051 }
1052 /*
1053 * Set the current primary ALUA access state to the requested new state
1054 */
1055 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1056 tg_pt_gp->tg_pt_gp_alua_pending_state);
1057
1058 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1059 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1060 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1061 tg_pt_gp->tg_pt_gp_id,
1062 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1063 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1064 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1065 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1066 smp_mb__after_atomic();
1067 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1068
1069 if (tg_pt_gp->tg_pt_gp_transition_complete)
1070 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1071 }
1072
1073 static int core_alua_do_transition_tg_pt(
1074 struct t10_alua_tg_pt_gp *tg_pt_gp,
1075 int new_state,
1076 int explicit)
1077 {
1078 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1079 DECLARE_COMPLETION_ONSTACK(wait);
1080
1081 /* Nothing to be done here */
1082 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1083 return 0;
1084
1085 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1086 return -EAGAIN;
1087
1088 /*
1089 * Flush any pending transitions
1090 */
1091 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1092 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1093 ALUA_ACCESS_STATE_TRANSITION) {
1094 /* Just in case */
1095 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1096 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1097 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1098 wait_for_completion(&wait);
1099 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1100 return 0;
1101 }
1102
1103 /*
1104 * Save the old primary ALUA access state, and set the current state
1105 * to ALUA_ACCESS_STATE_TRANSITION.
1106 */
1107 tg_pt_gp->tg_pt_gp_alua_previous_state =
1108 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1109 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1110
1111 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1112 ALUA_ACCESS_STATE_TRANSITION);
1113 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1114 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1115 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1116
1117 /*
1118 * Check for the optional ALUA primary state transition delay
1119 */
1120 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1121 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1122
1123 /*
1124 * Take a reference for workqueue item
1125 */
1126 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1127 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1128 smp_mb__after_atomic();
1129 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1130
1131 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1132 unsigned long transition_tmo;
1133
1134 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1135 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1136 &tg_pt_gp->tg_pt_gp_transition_work,
1137 transition_tmo);
1138 } else {
1139 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1140 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1141 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1142 wait_for_completion(&wait);
1143 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1144 }
1145
1146 return 0;
1147 }
1148
1149 int core_alua_do_port_transition(
1150 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1151 struct se_device *l_dev,
1152 struct se_port *l_port,
1153 struct se_node_acl *l_nacl,
1154 int new_state,
1155 int explicit)
1156 {
1157 struct se_device *dev;
1158 struct t10_alua_lu_gp *lu_gp;
1159 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1160 struct t10_alua_tg_pt_gp *tg_pt_gp;
1161 int primary, valid_states, rc = 0;
1162
1163 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1164 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1165 return -EINVAL;
1166
1167 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1168 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1169 lu_gp = local_lu_gp_mem->lu_gp;
1170 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1171 smp_mb__after_atomic();
1172 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1173 /*
1174 * For storage objects that are members of the 'default_lu_gp',
1175 * we only do transition on the passed *l_tp_pt_gp, and not
1176 * on all of the matching target port groups IDs in default_lu_gp.
1177 */
1178 if (!lu_gp->lu_gp_id) {
1179 /*
1180 * core_alua_do_transition_tg_pt() will always return
1181 * success.
1182 */
1183 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1184 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1185 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1186 new_state, explicit);
1187 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1188 smp_mb__after_atomic();
1189 return rc;
1190 }
1191 /*
1192 * For all other LU groups aside from 'default_lu_gp', walk all of
1193 * the associated storage objects looking for a matching target port
1194 * group ID from the local target port group.
1195 */
1196 spin_lock(&lu_gp->lu_gp_lock);
1197 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1198 lu_gp_mem_list) {
1199
1200 dev = lu_gp_mem->lu_gp_mem_dev;
1201 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
1202 smp_mb__after_atomic();
1203 spin_unlock(&lu_gp->lu_gp_lock);
1204
1205 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1206 list_for_each_entry(tg_pt_gp,
1207 &dev->t10_alua.tg_pt_gps_list,
1208 tg_pt_gp_list) {
1209
1210 if (!tg_pt_gp->tg_pt_gp_valid_id)
1211 continue;
1212 /*
1213 * If the target behavior port asymmetric access state
1214 * is changed for any target port group accessible via
1215 * a logical unit within a LU group, the target port
1216 * behavior group asymmetric access states for the same
1217 * target port group accessible via other logical units
1218 * in that LU group will also change.
1219 */
1220 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1221 continue;
1222
1223 if (l_tg_pt_gp == tg_pt_gp) {
1224 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1225 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1226 } else {
1227 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1228 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1229 }
1230 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1231 smp_mb__after_atomic();
1232 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1233 /*
1234 * core_alua_do_transition_tg_pt() will always return
1235 * success.
1236 */
1237 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1238 new_state, explicit);
1239
1240 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1241 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1242 smp_mb__after_atomic();
1243 if (rc)
1244 break;
1245 }
1246 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1247
1248 spin_lock(&lu_gp->lu_gp_lock);
1249 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
1250 smp_mb__after_atomic();
1251 }
1252 spin_unlock(&lu_gp->lu_gp_lock);
1253
1254 if (!rc) {
1255 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1256 " Group IDs: %hu %s transition to primary state: %s\n",
1257 config_item_name(&lu_gp->lu_gp_group.cg_item),
1258 l_tg_pt_gp->tg_pt_gp_id,
1259 (explicit) ? "explicit" : "implicit",
1260 core_alua_dump_state(new_state));
1261 }
1262
1263 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1264 smp_mb__after_atomic();
1265 return rc;
1266 }
1267
1268 /*
1269 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1270 */
1271 static int core_alua_update_tpg_secondary_metadata(
1272 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1273 struct se_port *port)
1274 {
1275 unsigned char *md_buf;
1276 struct se_portal_group *se_tpg = port->sep_tpg;
1277 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1278 int len, rc;
1279
1280 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1281 if (!md_buf) {
1282 pr_err("Unable to allocate buf for ALUA metadata\n");
1283 return -ENOMEM;
1284 }
1285
1286 memset(path, 0, ALUA_METADATA_PATH_LEN);
1287 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1288
1289 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1290 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1291
1292 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1293 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1294 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1295
1296 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1297 "alua_tg_pt_status=0x%02x\n",
1298 atomic_read(&port->sep_tg_pt_secondary_offline),
1299 port->sep_tg_pt_secondary_stat);
1300
1301 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1302 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1303 port->sep_lun->unpacked_lun);
1304
1305 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1306 kfree(md_buf);
1307
1308 return rc;
1309 }
1310
1311 static int core_alua_set_tg_pt_secondary_state(
1312 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1313 struct se_port *port,
1314 int explicit,
1315 int offline)
1316 {
1317 struct t10_alua_tg_pt_gp *tg_pt_gp;
1318 int trans_delay_msecs;
1319
1320 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1321 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1322 if (!tg_pt_gp) {
1323 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1324 pr_err("Unable to complete secondary state"
1325 " transition\n");
1326 return -EINVAL;
1327 }
1328 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1329 /*
1330 * Set the secondary ALUA target port access state to OFFLINE
1331 * or release the previously secondary state for struct se_port
1332 */
1333 if (offline)
1334 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1335 else
1336 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1337
1338 port->sep_tg_pt_secondary_stat = (explicit) ?
1339 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1340 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1341
1342 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1343 " to secondary access state: %s\n", (explicit) ? "explicit" :
1344 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1345 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1346
1347 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1348 /*
1349 * Do the optional transition delay after we set the secondary
1350 * ALUA access state.
1351 */
1352 if (trans_delay_msecs != 0)
1353 msleep_interruptible(trans_delay_msecs);
1354 /*
1355 * See if we need to update the ALUA fabric port metadata for
1356 * secondary state and status
1357 */
1358 if (port->sep_tg_pt_secondary_write_md) {
1359 mutex_lock(&port->sep_tg_pt_md_mutex);
1360 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1361 mutex_unlock(&port->sep_tg_pt_md_mutex);
1362 }
1363
1364 return 0;
1365 }
1366
1367 struct t10_alua_lba_map *
1368 core_alua_allocate_lba_map(struct list_head *list,
1369 u64 first_lba, u64 last_lba)
1370 {
1371 struct t10_alua_lba_map *lba_map;
1372
1373 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1374 if (!lba_map) {
1375 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1376 return ERR_PTR(-ENOMEM);
1377 }
1378 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1379 lba_map->lba_map_first_lba = first_lba;
1380 lba_map->lba_map_last_lba = last_lba;
1381
1382 list_add_tail(&lba_map->lba_map_list, list);
1383 return lba_map;
1384 }
1385
1386 int
1387 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1388 int pg_id, int state)
1389 {
1390 struct t10_alua_lba_map_member *lba_map_mem;
1391
1392 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1393 lba_map_mem_list) {
1394 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1395 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1396 return -EINVAL;
1397 }
1398 }
1399
1400 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1401 if (!lba_map_mem) {
1402 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1403 return -ENOMEM;
1404 }
1405 lba_map_mem->lba_map_mem_alua_state = state;
1406 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1407
1408 list_add_tail(&lba_map_mem->lba_map_mem_list,
1409 &lba_map->lba_map_mem_list);
1410 return 0;
1411 }
1412
1413 void
1414 core_alua_free_lba_map(struct list_head *lba_list)
1415 {
1416 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1417 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1418
1419 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1420 lba_map_list) {
1421 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1422 &lba_map->lba_map_mem_list,
1423 lba_map_mem_list) {
1424 list_del(&lba_map_mem->lba_map_mem_list);
1425 kmem_cache_free(t10_alua_lba_map_mem_cache,
1426 lba_map_mem);
1427 }
1428 list_del(&lba_map->lba_map_list);
1429 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1430 }
1431 }
1432
1433 void
1434 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1435 int segment_size, int segment_mult)
1436 {
1437 struct list_head old_lba_map_list;
1438 struct t10_alua_tg_pt_gp *tg_pt_gp;
1439 int activate = 0, supported;
1440
1441 INIT_LIST_HEAD(&old_lba_map_list);
1442 spin_lock(&dev->t10_alua.lba_map_lock);
1443 dev->t10_alua.lba_map_segment_size = segment_size;
1444 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1445 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1446 if (lba_map_list) {
1447 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1448 activate = 1;
1449 }
1450 spin_unlock(&dev->t10_alua.lba_map_lock);
1451 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1452 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1453 tg_pt_gp_list) {
1454
1455 if (!tg_pt_gp->tg_pt_gp_valid_id)
1456 continue;
1457 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1458 if (activate)
1459 supported |= ALUA_LBD_SUP;
1460 else
1461 supported &= ~ALUA_LBD_SUP;
1462 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1463 }
1464 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1465 core_alua_free_lba_map(&old_lba_map_list);
1466 }
1467
1468 struct t10_alua_lu_gp *
1469 core_alua_allocate_lu_gp(const char *name, int def_group)
1470 {
1471 struct t10_alua_lu_gp *lu_gp;
1472
1473 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1474 if (!lu_gp) {
1475 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1476 return ERR_PTR(-ENOMEM);
1477 }
1478 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1479 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1480 spin_lock_init(&lu_gp->lu_gp_lock);
1481 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1482
1483 if (def_group) {
1484 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1485 lu_gp->lu_gp_valid_id = 1;
1486 alua_lu_gps_count++;
1487 }
1488
1489 return lu_gp;
1490 }
1491
1492 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1493 {
1494 struct t10_alua_lu_gp *lu_gp_tmp;
1495 u16 lu_gp_id_tmp;
1496 /*
1497 * The lu_gp->lu_gp_id may only be set once..
1498 */
1499 if (lu_gp->lu_gp_valid_id) {
1500 pr_warn("ALUA LU Group already has a valid ID,"
1501 " ignoring request\n");
1502 return -EINVAL;
1503 }
1504
1505 spin_lock(&lu_gps_lock);
1506 if (alua_lu_gps_count == 0x0000ffff) {
1507 pr_err("Maximum ALUA alua_lu_gps_count:"
1508 " 0x0000ffff reached\n");
1509 spin_unlock(&lu_gps_lock);
1510 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1511 return -ENOSPC;
1512 }
1513 again:
1514 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1515 alua_lu_gps_counter++;
1516
1517 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1518 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1519 if (!lu_gp_id)
1520 goto again;
1521
1522 pr_warn("ALUA Logical Unit Group ID: %hu"
1523 " already exists, ignoring request\n",
1524 lu_gp_id);
1525 spin_unlock(&lu_gps_lock);
1526 return -EINVAL;
1527 }
1528 }
1529
1530 lu_gp->lu_gp_id = lu_gp_id_tmp;
1531 lu_gp->lu_gp_valid_id = 1;
1532 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1533 alua_lu_gps_count++;
1534 spin_unlock(&lu_gps_lock);
1535
1536 return 0;
1537 }
1538
1539 static struct t10_alua_lu_gp_member *
1540 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1541 {
1542 struct t10_alua_lu_gp_member *lu_gp_mem;
1543
1544 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1545 if (!lu_gp_mem) {
1546 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1547 return ERR_PTR(-ENOMEM);
1548 }
1549 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1550 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1551 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1552
1553 lu_gp_mem->lu_gp_mem_dev = dev;
1554 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1555
1556 return lu_gp_mem;
1557 }
1558
1559 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1560 {
1561 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1562 /*
1563 * Once we have reached this point, config_item_put() has
1564 * already been called from target_core_alua_drop_lu_gp().
1565 *
1566 * Here, we remove the *lu_gp from the global list so that
1567 * no associations can be made while we are releasing
1568 * struct t10_alua_lu_gp.
1569 */
1570 spin_lock(&lu_gps_lock);
1571 list_del(&lu_gp->lu_gp_node);
1572 alua_lu_gps_count--;
1573 spin_unlock(&lu_gps_lock);
1574 /*
1575 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1576 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1577 * released with core_alua_put_lu_gp_from_name()
1578 */
1579 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1580 cpu_relax();
1581 /*
1582 * Release reference to struct t10_alua_lu_gp * from all associated
1583 * struct se_device.
1584 */
1585 spin_lock(&lu_gp->lu_gp_lock);
1586 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1587 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1588 if (lu_gp_mem->lu_gp_assoc) {
1589 list_del(&lu_gp_mem->lu_gp_mem_list);
1590 lu_gp->lu_gp_members--;
1591 lu_gp_mem->lu_gp_assoc = 0;
1592 }
1593 spin_unlock(&lu_gp->lu_gp_lock);
1594 /*
1595 *
1596 * lu_gp_mem is associated with a single
1597 * struct se_device->dev_alua_lu_gp_mem, and is released when
1598 * struct se_device is released via core_alua_free_lu_gp_mem().
1599 *
1600 * If the passed lu_gp does NOT match the default_lu_gp, assume
1601 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1602 */
1603 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1604 if (lu_gp != default_lu_gp)
1605 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1606 default_lu_gp);
1607 else
1608 lu_gp_mem->lu_gp = NULL;
1609 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1610
1611 spin_lock(&lu_gp->lu_gp_lock);
1612 }
1613 spin_unlock(&lu_gp->lu_gp_lock);
1614
1615 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1616 }
1617
1618 void core_alua_free_lu_gp_mem(struct se_device *dev)
1619 {
1620 struct t10_alua_lu_gp *lu_gp;
1621 struct t10_alua_lu_gp_member *lu_gp_mem;
1622
1623 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1624 if (!lu_gp_mem)
1625 return;
1626
1627 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1628 cpu_relax();
1629
1630 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1631 lu_gp = lu_gp_mem->lu_gp;
1632 if (lu_gp) {
1633 spin_lock(&lu_gp->lu_gp_lock);
1634 if (lu_gp_mem->lu_gp_assoc) {
1635 list_del(&lu_gp_mem->lu_gp_mem_list);
1636 lu_gp->lu_gp_members--;
1637 lu_gp_mem->lu_gp_assoc = 0;
1638 }
1639 spin_unlock(&lu_gp->lu_gp_lock);
1640 lu_gp_mem->lu_gp = NULL;
1641 }
1642 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1643
1644 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1645 }
1646
1647 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1648 {
1649 struct t10_alua_lu_gp *lu_gp;
1650 struct config_item *ci;
1651
1652 spin_lock(&lu_gps_lock);
1653 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1654 if (!lu_gp->lu_gp_valid_id)
1655 continue;
1656 ci = &lu_gp->lu_gp_group.cg_item;
1657 if (!strcmp(config_item_name(ci), name)) {
1658 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1659 spin_unlock(&lu_gps_lock);
1660 return lu_gp;
1661 }
1662 }
1663 spin_unlock(&lu_gps_lock);
1664
1665 return NULL;
1666 }
1667
1668 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1669 {
1670 spin_lock(&lu_gps_lock);
1671 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1672 spin_unlock(&lu_gps_lock);
1673 }
1674
1675 /*
1676 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1677 */
1678 void __core_alua_attach_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 lu_gp_mem->lu_gp = lu_gp;
1684 lu_gp_mem->lu_gp_assoc = 1;
1685 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1686 lu_gp->lu_gp_members++;
1687 spin_unlock(&lu_gp->lu_gp_lock);
1688 }
1689
1690 /*
1691 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1692 */
1693 void __core_alua_drop_lu_gp_mem(
1694 struct t10_alua_lu_gp_member *lu_gp_mem,
1695 struct t10_alua_lu_gp *lu_gp)
1696 {
1697 spin_lock(&lu_gp->lu_gp_lock);
1698 list_del(&lu_gp_mem->lu_gp_mem_list);
1699 lu_gp_mem->lu_gp = NULL;
1700 lu_gp_mem->lu_gp_assoc = 0;
1701 lu_gp->lu_gp_members--;
1702 spin_unlock(&lu_gp->lu_gp_lock);
1703 }
1704
1705 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1706 const char *name, int def_group)
1707 {
1708 struct t10_alua_tg_pt_gp *tg_pt_gp;
1709
1710 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1711 if (!tg_pt_gp) {
1712 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1713 return NULL;
1714 }
1715 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1716 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1717 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1718 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1719 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1720 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1721 core_alua_do_transition_tg_pt_work);
1722 tg_pt_gp->tg_pt_gp_dev = dev;
1723 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1724 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1725 /*
1726 * Enable both explicit and implicit ALUA support by default
1727 */
1728 tg_pt_gp->tg_pt_gp_alua_access_type =
1729 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1730 /*
1731 * Set the default Active/NonOptimized Delay in milliseconds
1732 */
1733 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1734 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1735 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1736
1737 /*
1738 * Enable all supported states
1739 */
1740 tg_pt_gp->tg_pt_gp_alua_supported_states =
1741 ALUA_T_SUP | ALUA_O_SUP |
1742 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1743
1744 if (def_group) {
1745 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1746 tg_pt_gp->tg_pt_gp_id =
1747 dev->t10_alua.alua_tg_pt_gps_counter++;
1748 tg_pt_gp->tg_pt_gp_valid_id = 1;
1749 dev->t10_alua.alua_tg_pt_gps_count++;
1750 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1751 &dev->t10_alua.tg_pt_gps_list);
1752 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1753 }
1754
1755 return tg_pt_gp;
1756 }
1757
1758 int core_alua_set_tg_pt_gp_id(
1759 struct t10_alua_tg_pt_gp *tg_pt_gp,
1760 u16 tg_pt_gp_id)
1761 {
1762 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1763 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1764 u16 tg_pt_gp_id_tmp;
1765
1766 /*
1767 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1768 */
1769 if (tg_pt_gp->tg_pt_gp_valid_id) {
1770 pr_warn("ALUA TG PT Group already has a valid ID,"
1771 " ignoring request\n");
1772 return -EINVAL;
1773 }
1774
1775 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1776 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1777 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1778 " 0x0000ffff reached\n");
1779 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1780 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1781 return -ENOSPC;
1782 }
1783 again:
1784 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1785 dev->t10_alua.alua_tg_pt_gps_counter++;
1786
1787 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1788 tg_pt_gp_list) {
1789 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1790 if (!tg_pt_gp_id)
1791 goto again;
1792
1793 pr_err("ALUA Target Port Group ID: %hu already"
1794 " exists, ignoring request\n", tg_pt_gp_id);
1795 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1796 return -EINVAL;
1797 }
1798 }
1799
1800 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1801 tg_pt_gp->tg_pt_gp_valid_id = 1;
1802 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1803 &dev->t10_alua.tg_pt_gps_list);
1804 dev->t10_alua.alua_tg_pt_gps_count++;
1805 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1806
1807 return 0;
1808 }
1809
1810 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1811 struct se_port *port)
1812 {
1813 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1814
1815 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1816 GFP_KERNEL);
1817 if (!tg_pt_gp_mem) {
1818 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1819 return ERR_PTR(-ENOMEM);
1820 }
1821 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1822 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1823 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1824
1825 tg_pt_gp_mem->tg_pt = port;
1826 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1827
1828 return tg_pt_gp_mem;
1829 }
1830
1831 void core_alua_free_tg_pt_gp(
1832 struct t10_alua_tg_pt_gp *tg_pt_gp)
1833 {
1834 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1835 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1836
1837 /*
1838 * Once we have reached this point, config_item_put() has already
1839 * been called from target_core_alua_drop_tg_pt_gp().
1840 *
1841 * Here we remove *tg_pt_gp from the global list so that
1842 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1843 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1844 */
1845 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1846 list_del(&tg_pt_gp->tg_pt_gp_list);
1847 dev->t10_alua.alua_tg_pt_gps_counter--;
1848 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1849
1850 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1851
1852 /*
1853 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1854 * core_alua_get_tg_pt_gp_by_name() in
1855 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1856 * to be released with core_alua_put_tg_pt_gp_from_name().
1857 */
1858 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1859 cpu_relax();
1860
1861 /*
1862 * Release reference to struct t10_alua_tg_pt_gp from all associated
1863 * struct se_port.
1864 */
1865 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1866 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1867 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1868 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1869 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1870 tg_pt_gp->tg_pt_gp_members--;
1871 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1872 }
1873 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1874 /*
1875 * tg_pt_gp_mem is associated with a single
1876 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1877 * core_alua_free_tg_pt_gp_mem().
1878 *
1879 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1880 * assume we want to re-associate a given tg_pt_gp_mem with
1881 * default_tg_pt_gp.
1882 */
1883 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1884 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1885 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1886 dev->t10_alua.default_tg_pt_gp);
1887 } else
1888 tg_pt_gp_mem->tg_pt_gp = NULL;
1889 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1890
1891 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1892 }
1893 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1894
1895 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1896 }
1897
1898 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1899 {
1900 struct t10_alua_tg_pt_gp *tg_pt_gp;
1901 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1902
1903 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1904 if (!tg_pt_gp_mem)
1905 return;
1906
1907 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1908 cpu_relax();
1909
1910 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1911 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1912 if (tg_pt_gp) {
1913 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1914 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1915 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1916 tg_pt_gp->tg_pt_gp_members--;
1917 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1918 }
1919 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1920 tg_pt_gp_mem->tg_pt_gp = NULL;
1921 }
1922 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1923
1924 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1925 }
1926
1927 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1928 struct se_device *dev, const char *name)
1929 {
1930 struct t10_alua_tg_pt_gp *tg_pt_gp;
1931 struct config_item *ci;
1932
1933 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1934 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1935 tg_pt_gp_list) {
1936 if (!tg_pt_gp->tg_pt_gp_valid_id)
1937 continue;
1938 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1939 if (!strcmp(config_item_name(ci), name)) {
1940 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1941 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1942 return tg_pt_gp;
1943 }
1944 }
1945 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1946
1947 return NULL;
1948 }
1949
1950 static void core_alua_put_tg_pt_gp_from_name(
1951 struct t10_alua_tg_pt_gp *tg_pt_gp)
1952 {
1953 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1954
1955 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1956 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1957 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1958 }
1959
1960 /*
1961 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1962 */
1963 void __core_alua_attach_tg_pt_gp_mem(
1964 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1965 struct t10_alua_tg_pt_gp *tg_pt_gp)
1966 {
1967 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1968 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1969 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1970 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1971 &tg_pt_gp->tg_pt_gp_mem_list);
1972 tg_pt_gp->tg_pt_gp_members++;
1973 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1974 }
1975
1976 /*
1977 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1978 */
1979 static void __core_alua_drop_tg_pt_gp_mem(
1980 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1981 struct t10_alua_tg_pt_gp *tg_pt_gp)
1982 {
1983 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1984 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1985 tg_pt_gp_mem->tg_pt_gp = NULL;
1986 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1987 tg_pt_gp->tg_pt_gp_members--;
1988 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1989 }
1990
1991 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1992 {
1993 struct config_item *tg_pt_ci;
1994 struct t10_alua_tg_pt_gp *tg_pt_gp;
1995 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1996 ssize_t len = 0;
1997
1998 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1999 if (!tg_pt_gp_mem)
2000 return len;
2001
2002 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2003 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2004 if (tg_pt_gp) {
2005 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
2006 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
2007 " %hu\nTG Port Primary Access State: %s\nTG Port "
2008 "Primary Access Status: %s\nTG Port Secondary Access"
2009 " State: %s\nTG Port Secondary Access Status: %s\n",
2010 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
2011 core_alua_dump_state(atomic_read(
2012 &tg_pt_gp->tg_pt_gp_alua_access_state)),
2013 core_alua_dump_status(
2014 tg_pt_gp->tg_pt_gp_alua_access_status),
2015 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2016 "Offline" : "None",
2017 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2018 }
2019 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2020
2021 return len;
2022 }
2023
2024 ssize_t core_alua_store_tg_pt_gp_info(
2025 struct se_port *port,
2026 const char *page,
2027 size_t count)
2028 {
2029 struct se_portal_group *tpg;
2030 struct se_lun *lun;
2031 struct se_device *dev = port->sep_lun->lun_se_dev;
2032 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2033 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2034 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2035 int move = 0;
2036
2037 tpg = port->sep_tpg;
2038 lun = port->sep_lun;
2039
2040 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2041 if (!tg_pt_gp_mem)
2042 return 0;
2043
2044 if (count > TG_PT_GROUP_NAME_BUF) {
2045 pr_err("ALUA Target Port Group alias too large!\n");
2046 return -EINVAL;
2047 }
2048 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2049 memcpy(buf, page, count);
2050 /*
2051 * Any ALUA target port group alias besides "NULL" means we will be
2052 * making a new group association.
2053 */
2054 if (strcmp(strstrip(buf), "NULL")) {
2055 /*
2056 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2057 * struct t10_alua_tg_pt_gp. This reference is released with
2058 * core_alua_put_tg_pt_gp_from_name() below.
2059 */
2060 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2061 strstrip(buf));
2062 if (!tg_pt_gp_new)
2063 return -ENODEV;
2064 }
2065
2066 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2067 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2068 if (tg_pt_gp) {
2069 /*
2070 * Clearing an existing tg_pt_gp association, and replacing
2071 * with the default_tg_pt_gp.
2072 */
2073 if (!tg_pt_gp_new) {
2074 pr_debug("Target_Core_ConfigFS: Moving"
2075 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2076 " alua/%s, ID: %hu back to"
2077 " default_tg_pt_gp\n",
2078 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2079 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2080 config_item_name(&lun->lun_group.cg_item),
2081 config_item_name(
2082 &tg_pt_gp->tg_pt_gp_group.cg_item),
2083 tg_pt_gp->tg_pt_gp_id);
2084
2085 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2086 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2087 dev->t10_alua.default_tg_pt_gp);
2088 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2089
2090 return count;
2091 }
2092 /*
2093 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2094 */
2095 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2096 move = 1;
2097 }
2098 /*
2099 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2100 */
2101 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2102 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2103 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2104 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2105 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2106 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2107 config_item_name(&lun->lun_group.cg_item),
2108 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2109 tg_pt_gp_new->tg_pt_gp_id);
2110
2111 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2112 return count;
2113 }
2114
2115 ssize_t core_alua_show_access_type(
2116 struct t10_alua_tg_pt_gp *tg_pt_gp,
2117 char *page)
2118 {
2119 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2120 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2121 return sprintf(page, "Implicit and Explicit\n");
2122 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2123 return sprintf(page, "Implicit\n");
2124 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2125 return sprintf(page, "Explicit\n");
2126 else
2127 return sprintf(page, "None\n");
2128 }
2129
2130 ssize_t core_alua_store_access_type(
2131 struct t10_alua_tg_pt_gp *tg_pt_gp,
2132 const char *page,
2133 size_t count)
2134 {
2135 unsigned long tmp;
2136 int ret;
2137
2138 ret = kstrtoul(page, 0, &tmp);
2139 if (ret < 0) {
2140 pr_err("Unable to extract alua_access_type\n");
2141 return ret;
2142 }
2143 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2144 pr_err("Illegal value for alua_access_type:"
2145 " %lu\n", tmp);
2146 return -EINVAL;
2147 }
2148 if (tmp == 3)
2149 tg_pt_gp->tg_pt_gp_alua_access_type =
2150 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2151 else if (tmp == 2)
2152 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2153 else if (tmp == 1)
2154 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2155 else
2156 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2157
2158 return count;
2159 }
2160
2161 ssize_t core_alua_show_nonop_delay_msecs(
2162 struct t10_alua_tg_pt_gp *tg_pt_gp,
2163 char *page)
2164 {
2165 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2166 }
2167
2168 ssize_t core_alua_store_nonop_delay_msecs(
2169 struct t10_alua_tg_pt_gp *tg_pt_gp,
2170 const char *page,
2171 size_t count)
2172 {
2173 unsigned long tmp;
2174 int ret;
2175
2176 ret = kstrtoul(page, 0, &tmp);
2177 if (ret < 0) {
2178 pr_err("Unable to extract nonop_delay_msecs\n");
2179 return ret;
2180 }
2181 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2182 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2183 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2184 ALUA_MAX_NONOP_DELAY_MSECS);
2185 return -EINVAL;
2186 }
2187 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2188
2189 return count;
2190 }
2191
2192 ssize_t core_alua_show_trans_delay_msecs(
2193 struct t10_alua_tg_pt_gp *tg_pt_gp,
2194 char *page)
2195 {
2196 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2197 }
2198
2199 ssize_t core_alua_store_trans_delay_msecs(
2200 struct t10_alua_tg_pt_gp *tg_pt_gp,
2201 const char *page,
2202 size_t count)
2203 {
2204 unsigned long tmp;
2205 int ret;
2206
2207 ret = kstrtoul(page, 0, &tmp);
2208 if (ret < 0) {
2209 pr_err("Unable to extract trans_delay_msecs\n");
2210 return ret;
2211 }
2212 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2213 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2214 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2215 ALUA_MAX_TRANS_DELAY_MSECS);
2216 return -EINVAL;
2217 }
2218 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2219
2220 return count;
2221 }
2222
2223 ssize_t core_alua_show_implicit_trans_secs(
2224 struct t10_alua_tg_pt_gp *tg_pt_gp,
2225 char *page)
2226 {
2227 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2228 }
2229
2230 ssize_t core_alua_store_implicit_trans_secs(
2231 struct t10_alua_tg_pt_gp *tg_pt_gp,
2232 const char *page,
2233 size_t count)
2234 {
2235 unsigned long tmp;
2236 int ret;
2237
2238 ret = kstrtoul(page, 0, &tmp);
2239 if (ret < 0) {
2240 pr_err("Unable to extract implicit_trans_secs\n");
2241 return ret;
2242 }
2243 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2244 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2245 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2246 ALUA_MAX_IMPLICIT_TRANS_SECS);
2247 return -EINVAL;
2248 }
2249 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2250
2251 return count;
2252 }
2253
2254 ssize_t core_alua_show_preferred_bit(
2255 struct t10_alua_tg_pt_gp *tg_pt_gp,
2256 char *page)
2257 {
2258 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2259 }
2260
2261 ssize_t core_alua_store_preferred_bit(
2262 struct t10_alua_tg_pt_gp *tg_pt_gp,
2263 const char *page,
2264 size_t count)
2265 {
2266 unsigned long tmp;
2267 int ret;
2268
2269 ret = kstrtoul(page, 0, &tmp);
2270 if (ret < 0) {
2271 pr_err("Unable to extract preferred ALUA value\n");
2272 return ret;
2273 }
2274 if ((tmp != 0) && (tmp != 1)) {
2275 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2276 return -EINVAL;
2277 }
2278 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2279
2280 return count;
2281 }
2282
2283 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2284 {
2285 if (!lun->lun_sep)
2286 return -ENODEV;
2287
2288 return sprintf(page, "%d\n",
2289 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2290 }
2291
2292 ssize_t core_alua_store_offline_bit(
2293 struct se_lun *lun,
2294 const char *page,
2295 size_t count)
2296 {
2297 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2298 unsigned long tmp;
2299 int ret;
2300
2301 if (!lun->lun_sep)
2302 return -ENODEV;
2303
2304 ret = kstrtoul(page, 0, &tmp);
2305 if (ret < 0) {
2306 pr_err("Unable to extract alua_tg_pt_offline value\n");
2307 return ret;
2308 }
2309 if ((tmp != 0) && (tmp != 1)) {
2310 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2311 tmp);
2312 return -EINVAL;
2313 }
2314 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2315 if (!tg_pt_gp_mem) {
2316 pr_err("Unable to locate *tg_pt_gp_mem\n");
2317 return -EINVAL;
2318 }
2319
2320 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2321 lun->lun_sep, 0, (int)tmp);
2322 if (ret < 0)
2323 return -EINVAL;
2324
2325 return count;
2326 }
2327
2328 ssize_t core_alua_show_secondary_status(
2329 struct se_lun *lun,
2330 char *page)
2331 {
2332 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2333 }
2334
2335 ssize_t core_alua_store_secondary_status(
2336 struct se_lun *lun,
2337 const char *page,
2338 size_t count)
2339 {
2340 unsigned long tmp;
2341 int ret;
2342
2343 ret = kstrtoul(page, 0, &tmp);
2344 if (ret < 0) {
2345 pr_err("Unable to extract alua_tg_pt_status\n");
2346 return ret;
2347 }
2348 if ((tmp != ALUA_STATUS_NONE) &&
2349 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2350 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2351 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2352 tmp);
2353 return -EINVAL;
2354 }
2355 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2356
2357 return count;
2358 }
2359
2360 ssize_t core_alua_show_secondary_write_metadata(
2361 struct se_lun *lun,
2362 char *page)
2363 {
2364 return sprintf(page, "%d\n",
2365 lun->lun_sep->sep_tg_pt_secondary_write_md);
2366 }
2367
2368 ssize_t core_alua_store_secondary_write_metadata(
2369 struct se_lun *lun,
2370 const char *page,
2371 size_t count)
2372 {
2373 unsigned long tmp;
2374 int ret;
2375
2376 ret = kstrtoul(page, 0, &tmp);
2377 if (ret < 0) {
2378 pr_err("Unable to extract alua_tg_pt_write_md\n");
2379 return ret;
2380 }
2381 if ((tmp != 0) && (tmp != 1)) {
2382 pr_err("Illegal value for alua_tg_pt_write_md:"
2383 " %lu\n", tmp);
2384 return -EINVAL;
2385 }
2386 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2387
2388 return count;
2389 }
2390
2391 int core_setup_alua(struct se_device *dev)
2392 {
2393 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2394 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2395 struct t10_alua_lu_gp_member *lu_gp_mem;
2396
2397 /*
2398 * Associate this struct se_device with the default ALUA
2399 * LUN Group.
2400 */
2401 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2402 if (IS_ERR(lu_gp_mem))
2403 return PTR_ERR(lu_gp_mem);
2404
2405 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2406 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2407 default_lu_gp);
2408 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2409
2410 pr_debug("%s: Adding to default ALUA LU Group:"
2411 " core/alua/lu_gps/default_lu_gp\n",
2412 dev->transport->name);
2413 }
2414
2415 return 0;
2416 }
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