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rapidio: add DMA engine support for RIO data transfers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_alua.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * Copyright (c) 2009-2010 Rising Tide Systems
7 * Copyright (c) 2009-2010 Linux-iSCSI.org
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
c66ac9db
NB		 27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/configfs.h>
c53181af 30#include <linux/export.h>
c66ac9db
NB		 31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33395fb8 33#include <asm/unaligned.h>
c66ac9db
NB		 34
35#include <target/target_core_base.h>
c4795fb2
CH		 36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
c66ac9db
NB		 38#include <target/target_core_configfs.h>
39
e26d99ae 40#include "target_core_internal.h"
c66ac9db 41#include "target_core_alua.h"
c66ac9db
NB		 42#include "target_core_ua.h"
43
44static int core_alua_check_transition(int state, int *primary);
45static int core_alua_set_tg_pt_secondary_state(
46 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
47 struct se_port *port, int explict, int offline);
48
e3d6f909
AG		 49static u16 alua_lu_gps_counter;
50static u32 alua_lu_gps_count;
51
52static DEFINE_SPINLOCK(lu_gps_lock);
53static LIST_HEAD(lu_gps_list);
54
55struct t10_alua_lu_gp *default_lu_gp;
56
c66ac9db
NB		 57/*
58 * REPORT_TARGET_PORT_GROUPS
59 *
60 * See spc4r17 section 6.27
61 */
6bb35e00 62int target_emulate_report_target_port_groups(struct se_cmd *cmd)
c66ac9db 63{
5951146d 64 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
c66ac9db
NB		 65 struct se_port *port;
66 struct t10_alua_tg_pt_gp *tg_pt_gp;
67 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
05d1c7c0 68 unsigned char *buf;
5b9a4d72
NB		 69 u32 rd_len = 0, off;
70 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
6b20fa9a 71 /*
5b9a4d72
NB		 72 * Skip over RESERVED area to first Target port group descriptor
73 * depending on the PARAMETER DATA FORMAT type..
6b20fa9a 74 */
5b9a4d72
NB		 75 if (ext_hdr != 0)
76 off = 8;
77 else
78 off = 4;
79
80 if (cmd->data_length < off) {
81 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
82 " small for %s header\n", cmd->data_length,
83 (ext_hdr) ? "extended" : "normal");
84 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
6b20fa9a
NB		 85 return -EINVAL;
86 }
4949314c 87 buf = transport_kmap_data_sg(cmd);
05d1c7c0 88
e3d6f909
AG		 89 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
90 list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
c66ac9db 91 tg_pt_gp_list) {
6b20fa9a
NB		 92 /*
93 * Check if the Target port group and Target port descriptor list
94 * based on tg_pt_gp_members count will fit into the response payload.
95 * Otherwise, bump rd_len to let the initiator know we have exceeded
96 * the allocation length and the response is truncated.
97 */
98 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
99 cmd->data_length) {
100 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
101 continue;
102 }
c66ac9db
NB		 103 /*
104 * PREF: Preferred target port bit, determine if this
105 * bit should be set for port group.
106 */
107 if (tg_pt_gp->tg_pt_gp_pref)
108 buf[off] = 0x80;
109 /*
110 * Set the ASYMMETRIC ACCESS State
111 */
112 buf[off++] |= (atomic_read(
113 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
114 /*
115 * Set supported ASYMMETRIC ACCESS State bits
116 */
117 buf[off] = 0x80; /* T_SUP */
118 buf[off] |= 0x40; /* O_SUP */
119 buf[off] |= 0x8; /* U_SUP */
120 buf[off] |= 0x4; /* S_SUP */
121 buf[off] |= 0x2; /* AN_SUP */
122 buf[off++] |= 0x1; /* AO_SUP */
123 /*
124 * TARGET PORT GROUP
125 */
126 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
127 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
128
129 off++; /* Skip over Reserved */
130 /*
131 * STATUS CODE
132 */
133 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
134 /*
135 * Vendor Specific field
136 */
137 buf[off++] = 0x00;
138 /*
139 * TARGET PORT COUNT
140 */
141 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
142 rd_len += 8;
143
144 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
145 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
146 tg_pt_gp_mem_list) {
147 port = tg_pt_gp_mem->tg_pt;
148 /*
149 * Start Target Port descriptor format
150 *
151 * See spc4r17 section 6.2.7 Table 247
152 */
153 off += 2; /* Skip over Obsolete */
154 /*
155 * Set RELATIVE TARGET PORT IDENTIFIER
156 */
157 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
158 buf[off++] = (port->sep_rtpi & 0xff);
159 rd_len += 4;
160 }
161 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
162 }
e3d6f909 163 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 164 /*
165 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
166 */
5b9a4d72 167 put_unaligned_be32(rd_len, &buf[0]);
c66ac9db 168
5b9a4d72
NB		 169 /*
170 * Fill in the Extended header parameter data format if requested
171 */
172 if (ext_hdr != 0) {
173 buf[4] = 0x10;
174 /*
175 * Set the implict transition time (in seconds) for the application
176 * client to use as a base for it's transition timeout value.
177 *
178 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
179 * this CDB was received upon to determine this value individually
180 * for ALUA target port group.
181 */
182 port = cmd->se_lun->lun_sep;
183 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
184 if (tg_pt_gp_mem) {
185 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
186 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
187 if (tg_pt_gp)
188 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
189 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
190 }
191 }
4949314c 192 transport_kunmap_data_sg(cmd);
05d1c7c0 193
6bb35e00 194 target_complete_cmd(cmd, GOOD);
c66ac9db
NB		 195 return 0;
196}
197
198/*
199 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
200 *
201 * See spc4r17 section 6.35
202 */
6bb35e00 203int target_emulate_set_target_port_groups(struct se_cmd *cmd)
c66ac9db 204{
5951146d 205 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 206 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
207 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
208 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
c66ac9db
NB		 209 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
210 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
05d1c7c0
AG		 211 unsigned char *buf;
212 unsigned char *ptr;
c66ac9db
NB		 213 u32 len = 4; /* Skip over RESERVED area in header */
214 int alua_access_state, primary = 0, rc;
215 u16 tg_pt_id, rtpi;
216
03e98c9e
NB		 217 if (!l_port) {
218 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
219 return -EINVAL;
220 }
4949314c 221 buf = transport_kmap_data_sg(cmd);
05d1c7c0 222
c66ac9db
NB		 223 /*
224 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
225 * for the local tg_pt_gp.
226 */
227 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
6708bb27
AG		 228 if (!l_tg_pt_gp_mem) {
229 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
03e98c9e
NB		 230 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
231 rc = -EINVAL;
05d1c7c0 232 goto out;
c66ac9db
NB		 233 }
234 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
235 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
6708bb27 236 if (!l_tg_pt_gp) {
c66ac9db 237 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
6708bb27 238 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
03e98c9e
NB		 239 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
240 rc = -EINVAL;
05d1c7c0 241 goto out;
c66ac9db
NB		 242 }
243 rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA);
244 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
245
6708bb27
AG		 246 if (!rc) {
247 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
c66ac9db 248 " while TPGS_EXPLICT_ALUA is disabled\n");
03e98c9e
NB		 249 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
250 rc = -EINVAL;
05d1c7c0 251 goto out;
c66ac9db
NB		 252 }
253
05d1c7c0
AG		 254 ptr = &buf[4]; /* Skip over RESERVED area in header */
255
c66ac9db
NB		 256 while (len < cmd->data_length) {
257 alua_access_state = (ptr[0] & 0x0f);
258 /*
259 * Check the received ALUA access state, and determine if
260 * the state is a primary or secondary target port asymmetric
261 * access state.
262 */
263 rc = core_alua_check_transition(alua_access_state, &primary);
264 if (rc != 0) {
265 /*
266 * If the SET TARGET PORT GROUPS attempts to establish
267 * an invalid combination of target port asymmetric
268 * access states or attempts to establish an
269 * unsupported target port asymmetric access state,
270 * then the command shall be terminated with CHECK
271 * CONDITION status, with the sense key set to ILLEGAL
272 * REQUEST, and the additional sense code set to INVALID
273 * FIELD IN PARAMETER LIST.
274 */
03e98c9e
NB		 275 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
276 rc = -EINVAL;
05d1c7c0 277 goto out;
c66ac9db
NB		 278 }
279 rc = -1;
280 /*
281 * If the ASYMMETRIC ACCESS STATE field (see table 267)
282 * specifies a primary target port asymmetric access state,
283 * then the TARGET PORT GROUP OR TARGET PORT field specifies
284 * a primary target port group for which the primary target
285 * port asymmetric access state shall be changed. If the
286 * ASYMMETRIC ACCESS STATE field specifies a secondary target
287 * port asymmetric access state, then the TARGET PORT GROUP OR
288 * TARGET PORT field specifies the relative target port
289 * identifier (see 3.1.120) of the target port for which the
290 * secondary target port asymmetric access state shall be
291 * changed.
292 */
293 if (primary) {
33395fb8 294 tg_pt_id = get_unaligned_be16(ptr + 2);
c66ac9db
NB		 295 /*
296 * Locate the matching target port group ID from
297 * the global tg_pt_gp list
298 */
e3d6f909 299 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 300 list_for_each_entry(tg_pt_gp,
e3d6f909 301 &su_dev->t10_alua.tg_pt_gps_list,
c66ac9db 302 tg_pt_gp_list) {
6708bb27 303 if (!tg_pt_gp->tg_pt_gp_valid_id)
c66ac9db
NB		 304 continue;
305
306 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
307 continue;
308
309 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
310 smp_mb__after_atomic_inc();
e3d6f909 311 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 312
313 rc = core_alua_do_port_transition(tg_pt_gp,
314 dev, l_port, nacl,
315 alua_access_state, 1);
316
e3d6f909 317 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 318 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
319 smp_mb__after_atomic_dec();
320 break;
321 }
e3d6f909 322 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 323 /*
324 * If not matching target port group ID can be located
325 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
326 */
05d1c7c0 327 if (rc != 0) {
03e98c9e
NB		 328 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
329 rc = -EINVAL;
05d1c7c0
AG		 330 goto out;
331 }
c66ac9db
NB		 332 } else {
333 /*
334 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
335 * the Target Port in question for the the incoming
336 * SET_TARGET_PORT_GROUPS op.
337 */
33395fb8 338 rtpi = get_unaligned_be16(ptr + 2);
c66ac9db
NB		 339 /*
340 * Locate the matching relative target port identifer
341 * for the struct se_device storage object.
342 */
343 spin_lock(&dev->se_port_lock);
344 list_for_each_entry(port, &dev->dev_sep_list,
345 sep_list) {
346 if (port->sep_rtpi != rtpi)
347 continue;
348
349 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
350 spin_unlock(&dev->se_port_lock);
351
352 rc = core_alua_set_tg_pt_secondary_state(
353 tg_pt_gp_mem, port, 1, 1);
354
355 spin_lock(&dev->se_port_lock);
356 break;
357 }
358 spin_unlock(&dev->se_port_lock);
359 /*
360 * If not matching relative target port identifier can
361 * be located, throw an exception with ASCQ:
362 * INVALID_PARAMETER_LIST
363 */
05d1c7c0 364 if (rc != 0) {
03e98c9e
NB		 365 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
366 rc = -EINVAL;
05d1c7c0
AG		 367 goto out;
368 }
c66ac9db
NB		 369 }
370
371 ptr += 4;
372 len += 4;
373 }
374
05d1c7c0 375out:
4949314c 376 transport_kunmap_data_sg(cmd);
6bb35e00 377 target_complete_cmd(cmd, GOOD);
c66ac9db
NB		 378 return 0;
379}
380
381static inline int core_alua_state_nonoptimized(
382 struct se_cmd *cmd,
383 unsigned char *cdb,
384 int nonop_delay_msecs,
385 u8 *alua_ascq)
386{
387 /*
388 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
389 * later to determine if processing of this cmd needs to be
390 * temporarily delayed for the Active/NonOptimized primary access state.
391 */
392 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
393 cmd->alua_nonop_delay = nonop_delay_msecs;
394 return 0;
395}
396
397static inline int core_alua_state_standby(
398 struct se_cmd *cmd,
399 unsigned char *cdb,
400 u8 *alua_ascq)
401{
402 /*
403 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
404 * spc4r17 section 5.9.2.4.4
405 */
406 switch (cdb[0]) {
407 case INQUIRY:
408 case LOG_SELECT:
409 case LOG_SENSE:
410 case MODE_SELECT:
411 case MODE_SENSE:
412 case REPORT_LUNS:
413 case RECEIVE_DIAGNOSTIC:
414 case SEND_DIAGNOSTIC:
415 case MAINTENANCE_IN:
ba539743 416 switch (cdb[1] & 0x1f) {
c66ac9db
NB		 417 case MI_REPORT_TARGET_PGS:
418 return 0;
419 default:
420 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
421 return 1;
422 }
423 case MAINTENANCE_OUT:
424 switch (cdb[1]) {
425 case MO_SET_TARGET_PGS:
426 return 0;
427 default:
428 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
429 return 1;
430 }
431 case REQUEST_SENSE:
432 case PERSISTENT_RESERVE_IN:
433 case PERSISTENT_RESERVE_OUT:
434 case READ_BUFFER:
435 case WRITE_BUFFER:
436 return 0;
437 default:
438 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
439 return 1;
440 }
441
442 return 0;
443}
444
445static inline int core_alua_state_unavailable(
446 struct se_cmd *cmd,
447 unsigned char *cdb,
448 u8 *alua_ascq)
449{
450 /*
451 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
452 * spc4r17 section 5.9.2.4.5
453 */
454 switch (cdb[0]) {
455 case INQUIRY:
456 case REPORT_LUNS:
457 case MAINTENANCE_IN:
ba539743 458 switch (cdb[1] & 0x1f) {
c66ac9db
NB		 459 case MI_REPORT_TARGET_PGS:
460 return 0;
461 default:
462 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
463 return 1;
464 }
465 case MAINTENANCE_OUT:
466 switch (cdb[1]) {
467 case MO_SET_TARGET_PGS:
468 return 0;
469 default:
470 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
471 return 1;
472 }
473 case REQUEST_SENSE:
474 case READ_BUFFER:
475 case WRITE_BUFFER:
476 return 0;
477 default:
478 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
479 return 1;
480 }
481
482 return 0;
483}
484
485static inline int core_alua_state_transition(
486 struct se_cmd *cmd,
487 unsigned char *cdb,
488 u8 *alua_ascq)
489{
490 /*
491 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
492 * spc4r17 section 5.9.2.5
493 */
494 switch (cdb[0]) {
495 case INQUIRY:
496 case REPORT_LUNS:
497 case MAINTENANCE_IN:
ba539743 498 switch (cdb[1] & 0x1f) {
c66ac9db
NB		 499 case MI_REPORT_TARGET_PGS:
500 return 0;
501 default:
502 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
503 return 1;
504 }
505 case REQUEST_SENSE:
506 case READ_BUFFER:
507 case WRITE_BUFFER:
508 return 0;
509 default:
510 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
511 return 1;
512 }
513
514 return 0;
515}
516
517/*
518 * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
519 * in transport_cmd_sequencer(). This function is assigned to
520 * struct t10_alua *->state_check() in core_setup_alua()
521 */
522static int core_alua_state_check_nop(
523 struct se_cmd *cmd,
524 unsigned char *cdb,
525 u8 *alua_ascq)
526{
527 return 0;
528}
529
530/*
531 * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
532 * This function is assigned to struct t10_alua *->state_check() in
533 * core_setup_alua()
534 *
535 * Also, this function can return three different return codes to
536 * signal transport_generic_cmd_sequencer()
537 *
538 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
539 * return 0: Used to signal success
540 * reutrn -1: Used to signal failure, and invalid cdb field
541 */
542static int core_alua_state_check(
543 struct se_cmd *cmd,
544 unsigned char *cdb,
545 u8 *alua_ascq)
546{
e3d6f909 547 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 548 struct se_port *port = lun->lun_sep;
549 struct t10_alua_tg_pt_gp *tg_pt_gp;
550 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
551 int out_alua_state, nonop_delay_msecs;
552
6708bb27 553 if (!port)
c66ac9db
NB		 554 return 0;
555 /*
556 * First, check for a struct se_port specific secondary ALUA target port
557 * access state: OFFLINE
558 */
559 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
560 *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
6708bb27 561 pr_debug("ALUA: Got secondary offline status for local"
c66ac9db
NB		 562 " target port\n");
563 *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
564 return 1;
565 }
566 /*
567 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
568 * ALUA target port group, to obtain current ALUA access state.
569 * Otherwise look for the underlying struct se_device association with
570 * a ALUA logical unit group.
571 */
572 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
573 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
574 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
575 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
576 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
577 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
578 /*
25985edc
LDM		 579 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
580 * statement so the compiler knows explicitly to check this case first.
c66ac9db
NB		 581 * For the Optimized ALUA access state case, we want to process the
582 * incoming fabric cmd ASAP..
583 */
584 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
585 return 0;
586
587 switch (out_alua_state) {
588 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
589 return core_alua_state_nonoptimized(cmd, cdb,
590 nonop_delay_msecs, alua_ascq);
591 case ALUA_ACCESS_STATE_STANDBY:
592 return core_alua_state_standby(cmd, cdb, alua_ascq);
593 case ALUA_ACCESS_STATE_UNAVAILABLE:
594 return core_alua_state_unavailable(cmd, cdb, alua_ascq);
595 case ALUA_ACCESS_STATE_TRANSITION:
596 return core_alua_state_transition(cmd, cdb, alua_ascq);
597 /*
598 * OFFLINE is a secondary ALUA target port group access state, that is
599 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
600 */
601 case ALUA_ACCESS_STATE_OFFLINE:
602 default:
6708bb27 603 pr_err("Unknown ALUA access state: 0x%02x\n",
c66ac9db 604 out_alua_state);
e3d6f909 605 return -EINVAL;
c66ac9db
NB		 606 }
607
608 return 0;
609}
610
611/*
612 * Check implict and explict ALUA state change request.
613 */
614static int core_alua_check_transition(int state, int *primary)
615{
616 switch (state) {
617 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
618 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
619 case ALUA_ACCESS_STATE_STANDBY:
620 case ALUA_ACCESS_STATE_UNAVAILABLE:
621 /*
622 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
623 * defined as primary target port asymmetric access states.
624 */
625 *primary = 1;
626 break;
627 case ALUA_ACCESS_STATE_OFFLINE:
628 /*
629 * OFFLINE state is defined as a secondary target port
630 * asymmetric access state.
631 */
632 *primary = 0;
633 break;
634 default:
6708bb27 635 pr_err("Unknown ALUA access state: 0x%02x\n", state);
e3d6f909 636 return -EINVAL;
c66ac9db
NB		 637 }
638
639 return 0;
640}
641
642static char *core_alua_dump_state(int state)
643{
644 switch (state) {
645 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
646 return "Active/Optimized";
647 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
648 return "Active/NonOptimized";
649 case ALUA_ACCESS_STATE_STANDBY:
650 return "Standby";
651 case ALUA_ACCESS_STATE_UNAVAILABLE:
652 return "Unavailable";
653 case ALUA_ACCESS_STATE_OFFLINE:
654 return "Offline";
655 default:
656 return "Unknown";
657 }
658
659 return NULL;
660}
661
662char *core_alua_dump_status(int status)
663{
664 switch (status) {
665 case ALUA_STATUS_NONE:
666 return "None";
667 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
668 return "Altered by Explict STPG";
669 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
670 return "Altered by Implict ALUA";
671 default:
672 return "Unknown";
673 }
674
675 return NULL;
676}
677
678/*
679 * Used by fabric modules to determine when we need to delay processing
680 * for the Active/NonOptimized paths..
681 */
682int core_alua_check_nonop_delay(
683 struct se_cmd *cmd)
684{
685 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
686 return 0;
687 if (in_interrupt())
688 return 0;
689 /*
690 * The ALUA Active/NonOptimized access state delay can be disabled
691 * in via configfs with a value of zero
692 */
6708bb27 693 if (!cmd->alua_nonop_delay)
c66ac9db
NB		 694 return 0;
695 /*
696 * struct se_cmd->alua_nonop_delay gets set by a target port group
697 * defined interval in core_alua_state_nonoptimized()
698 */
699 msleep_interruptible(cmd->alua_nonop_delay);
700 return 0;
701}
702EXPORT_SYMBOL(core_alua_check_nonop_delay);
703
704/*
705 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
706 *
707 */
708static int core_alua_write_tpg_metadata(
709 const char *path,
710 unsigned char *md_buf,
711 u32 md_buf_len)
712{
713 mm_segment_t old_fs;
714 struct file *file;
715 struct iovec iov[1];
716 int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
717
718 memset(iov, 0, sizeof(struct iovec));
719
720 file = filp_open(path, flags, 0600);
721 if (IS_ERR(file) || !file || !file->f_dentry) {
6708bb27 722 pr_err("filp_open(%s) for ALUA metadata failed\n",
c66ac9db
NB		 723 path);
724 return -ENODEV;
725 }
726
727 iov[0].iov_base = &md_buf[0];
728 iov[0].iov_len = md_buf_len;
729
730 old_fs = get_fs();
731 set_fs(get_ds());
732 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
733 set_fs(old_fs);
734
735 if (ret < 0) {
6708bb27 736 pr_err("Error writing ALUA metadata file: %s\n", path);
c66ac9db
NB		 737 filp_close(file, NULL);
738 return -EIO;
739 }
740 filp_close(file, NULL);
741
742 return 0;
743}
744
745/*
746 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
747 */
748static int core_alua_update_tpg_primary_metadata(
749 struct t10_alua_tg_pt_gp *tg_pt_gp,
750 int primary_state,
751 unsigned char *md_buf)
752{
753 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
754 struct t10_wwn *wwn = &su_dev->t10_wwn;
755 char path[ALUA_METADATA_PATH_LEN];
756 int len;
757
758 memset(path, 0, ALUA_METADATA_PATH_LEN);
759
760 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
761 "tg_pt_gp_id=%hu\n"
762 "alua_access_state=0x%02x\n"
763 "alua_access_status=0x%02x\n",
764 tg_pt_gp->tg_pt_gp_id, primary_state,
765 tg_pt_gp->tg_pt_gp_alua_access_status);
766
767 snprintf(path, ALUA_METADATA_PATH_LEN,
768 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
769 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
770
771 return core_alua_write_tpg_metadata(path, md_buf, len);
772}
773
774static int core_alua_do_transition_tg_pt(
775 struct t10_alua_tg_pt_gp *tg_pt_gp,
776 struct se_port *l_port,
777 struct se_node_acl *nacl,
778 unsigned char *md_buf,
779 int new_state,
780 int explict)
781{
782 struct se_dev_entry *se_deve;
783 struct se_lun_acl *lacl;
784 struct se_port *port;
785 struct t10_alua_tg_pt_gp_member *mem;
786 int old_state = 0;
787 /*
788 * Save the old primary ALUA access state, and set the current state
789 * to ALUA_ACCESS_STATE_TRANSITION.
790 */
791 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
792 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
793 ALUA_ACCESS_STATE_TRANSITION);
794 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
795 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
796 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
797 /*
798 * Check for the optional ALUA primary state transition delay
799 */
800 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
801 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
802
803 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
804 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
805 tg_pt_gp_mem_list) {
806 port = mem->tg_pt;
807 /*
808 * After an implicit target port asymmetric access state
809 * change, a device server shall establish a unit attention
810 * condition for the initiator port associated with every I_T
811 * nexus with the additional sense code set to ASYMMETRIC
812 * ACCESS STATE CHAGED.
813 *
814 * After an explicit target port asymmetric access state
815 * change, a device server shall establish a unit attention
816 * condition with the additional sense code set to ASYMMETRIC
817 * ACCESS STATE CHANGED for the initiator port associated with
818 * every I_T nexus other than the I_T nexus on which the SET
819 * TARGET PORT GROUPS command
820 */
821 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
822 smp_mb__after_atomic_inc();
823 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
824
825 spin_lock_bh(&port->sep_alua_lock);
826 list_for_each_entry(se_deve, &port->sep_alua_list,
827 alua_port_list) {
828 lacl = se_deve->se_lun_acl;
829 /*
830 * se_deve->se_lun_acl pointer may be NULL for a
831 * entry created without explict Node+MappedLUN ACLs
832 */
6708bb27 833 if (!lacl)
c66ac9db
NB		 834 continue;
835
836 if (explict &&
837 (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
838 (l_port != NULL) && (l_port == port))
839 continue;
840
841 core_scsi3_ua_allocate(lacl->se_lun_nacl,
842 se_deve->mapped_lun, 0x2A,
843 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
844 }
845 spin_unlock_bh(&port->sep_alua_lock);
846
847 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
848 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
849 smp_mb__after_atomic_dec();
850 }
851 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
852 /*
853 * Update the ALUA metadata buf that has been allocated in
854 * core_alua_do_port_transition(), this metadata will be written
855 * to struct file.
856 *
857 * Note that there is the case where we do not want to update the
858 * metadata when the saved metadata is being parsed in userspace
859 * when setting the existing port access state and access status.
860 *
861 * Also note that the failure to write out the ALUA metadata to
862 * struct file does NOT affect the actual ALUA transition.
863 */
864 if (tg_pt_gp->tg_pt_gp_write_metadata) {
865 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
866 core_alua_update_tpg_primary_metadata(tg_pt_gp,
867 new_state, md_buf);
868 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
869 }
870 /*
871 * Set the current primary ALUA access state to the requested new state
872 */
873 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
874
6708bb27 875 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
c66ac9db
NB		 876 " from primary access state %s to %s\n", (explict) ? "explict" :
877 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
878 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
879 core_alua_dump_state(new_state));
880
881 return 0;
882}
883
884int core_alua_do_port_transition(
885 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
886 struct se_device *l_dev,
887 struct se_port *l_port,
888 struct se_node_acl *l_nacl,
889 int new_state,
890 int explict)
891{
892 struct se_device *dev;
893 struct se_port *port;
894 struct se_subsystem_dev *su_dev;
895 struct se_node_acl *nacl;
896 struct t10_alua_lu_gp *lu_gp;
897 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
898 struct t10_alua_tg_pt_gp *tg_pt_gp;
899 unsigned char *md_buf;
900 int primary;
901
902 if (core_alua_check_transition(new_state, &primary) != 0)
903 return -EINVAL;
904
905 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
6708bb27
AG		 906 if (!md_buf) {
907 pr_err("Unable to allocate buf for ALUA metadata\n");
c66ac9db
NB		 908 return -ENOMEM;
909 }
910
911 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
912 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
913 lu_gp = local_lu_gp_mem->lu_gp;
914 atomic_inc(&lu_gp->lu_gp_ref_cnt);
915 smp_mb__after_atomic_inc();
916 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
917 /*
918 * For storage objects that are members of the 'default_lu_gp',
919 * we only do transition on the passed *l_tp_pt_gp, and not
920 * on all of the matching target port groups IDs in default_lu_gp.
921 */
6708bb27 922 if (!lu_gp->lu_gp_id) {
c66ac9db
NB		 923 /*
924 * core_alua_do_transition_tg_pt() will always return
925 * success.
926 */
927 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
928 md_buf, new_state, explict);
929 atomic_dec(&lu_gp->lu_gp_ref_cnt);
930 smp_mb__after_atomic_dec();
931 kfree(md_buf);
932 return 0;
933 }
934 /*
935 * For all other LU groups aside from 'default_lu_gp', walk all of
936 * the associated storage objects looking for a matching target port
937 * group ID from the local target port group.
938 */
939 spin_lock(&lu_gp->lu_gp_lock);
940 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
941 lu_gp_mem_list) {
942
943 dev = lu_gp_mem->lu_gp_mem_dev;
944 su_dev = dev->se_sub_dev;
945 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
946 smp_mb__after_atomic_inc();
947 spin_unlock(&lu_gp->lu_gp_lock);
948
e3d6f909 949 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 950 list_for_each_entry(tg_pt_gp,
e3d6f909 951 &su_dev->t10_alua.tg_pt_gps_list,
c66ac9db
NB		 952 tg_pt_gp_list) {
953
6708bb27 954 if (!tg_pt_gp->tg_pt_gp_valid_id)
c66ac9db
NB		 955 continue;
956 /*
957 * If the target behavior port asymmetric access state
958 * is changed for any target port group accessiable via
959 * a logical unit within a LU group, the target port
960 * behavior group asymmetric access states for the same
961 * target port group accessible via other logical units
962 * in that LU group will also change.
963 */
964 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
965 continue;
966
967 if (l_tg_pt_gp == tg_pt_gp) {
968 port = l_port;
969 nacl = l_nacl;
970 } else {
971 port = NULL;
972 nacl = NULL;
973 }
974 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
975 smp_mb__after_atomic_inc();
e3d6f909 976 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 977 /*
978 * core_alua_do_transition_tg_pt() will always return
979 * success.
980 */
981 core_alua_do_transition_tg_pt(tg_pt_gp, port,
982 nacl, md_buf, new_state, explict);
983
e3d6f909 984 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 985 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
986 smp_mb__after_atomic_dec();
987 }
e3d6f909 988 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 989
990 spin_lock(&lu_gp->lu_gp_lock);
991 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
992 smp_mb__after_atomic_dec();
993 }
994 spin_unlock(&lu_gp->lu_gp_lock);
995
6708bb27 996 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
c66ac9db
NB		 997 " Group IDs: %hu %s transition to primary state: %s\n",
998 config_item_name(&lu_gp->lu_gp_group.cg_item),
999 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
1000 core_alua_dump_state(new_state));
1001
1002 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1003 smp_mb__after_atomic_dec();
1004 kfree(md_buf);
1005 return 0;
1006}
1007
1008/*
1009 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1010 */
1011static int core_alua_update_tpg_secondary_metadata(
1012 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1013 struct se_port *port,
1014 unsigned char *md_buf,
1015 u32 md_buf_len)
1016{
1017 struct se_portal_group *se_tpg = port->sep_tpg;
1018 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1019 int len;
1020
1021 memset(path, 0, ALUA_METADATA_PATH_LEN);
1022 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1023
1024 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
e3d6f909 1025 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
c66ac9db 1026
e3d6f909 1027 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
c66ac9db 1028 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
e3d6f909 1029 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
c66ac9db
NB		 1030
1031 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
1032 "alua_tg_pt_status=0x%02x\n",
1033 atomic_read(&port->sep_tg_pt_secondary_offline),
1034 port->sep_tg_pt_secondary_stat);
1035
1036 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
e3d6f909 1037 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
c66ac9db
NB		 1038 port->sep_lun->unpacked_lun);
1039
1040 return core_alua_write_tpg_metadata(path, md_buf, len);
1041}
1042
1043static int core_alua_set_tg_pt_secondary_state(
1044 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1045 struct se_port *port,
1046 int explict,
1047 int offline)
1048{
1049 struct t10_alua_tg_pt_gp *tg_pt_gp;
1050 unsigned char *md_buf;
1051 u32 md_buf_len;
1052 int trans_delay_msecs;
1053
1054 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1055 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
6708bb27 1056 if (!tg_pt_gp) {
c66ac9db 1057 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
6708bb27 1058 pr_err("Unable to complete secondary state"
c66ac9db 1059 " transition\n");
e3d6f909 1060 return -EINVAL;
c66ac9db
NB		 1061 }
1062 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1063 /*
1064 * Set the secondary ALUA target port access state to OFFLINE
1065 * or release the previously secondary state for struct se_port
1066 */
1067 if (offline)
1068 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1069 else
1070 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1071
1072 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1073 port->sep_tg_pt_secondary_stat = (explict) ?
1074 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1075 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1076
6708bb27 1077 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
c66ac9db
NB		 1078 " to secondary access state: %s\n", (explict) ? "explict" :
1079 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1080 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1081
1082 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1083 /*
1084 * Do the optional transition delay after we set the secondary
1085 * ALUA access state.
1086 */
1087 if (trans_delay_msecs != 0)
1088 msleep_interruptible(trans_delay_msecs);
1089 /*
1090 * See if we need to update the ALUA fabric port metadata for
1091 * secondary state and status
1092 */
1093 if (port->sep_tg_pt_secondary_write_md) {
1094 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
6708bb27
AG		 1095 if (!md_buf) {
1096 pr_err("Unable to allocate md_buf for"
c66ac9db 1097 " secondary ALUA access metadata\n");
e3d6f909 1098 return -ENOMEM;
c66ac9db
NB		 1099 }
1100 mutex_lock(&port->sep_tg_pt_md_mutex);
1101 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1102 md_buf, md_buf_len);
1103 mutex_unlock(&port->sep_tg_pt_md_mutex);
1104
1105 kfree(md_buf);
1106 }
1107
1108 return 0;
1109}
1110
1111struct t10_alua_lu_gp *
1112core_alua_allocate_lu_gp(const char *name, int def_group)
1113{
1114 struct t10_alua_lu_gp *lu_gp;
1115
1116 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
6708bb27
AG		 1117 if (!lu_gp) {
1118 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
6eab04a8 1119 return ERR_PTR(-ENOMEM);
c66ac9db 1120 }
e3d6f909 1121 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
c66ac9db
NB		 1122 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1123 spin_lock_init(&lu_gp->lu_gp_lock);
1124 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1125
1126 if (def_group) {
e3d6f909 1127 lu_gp->lu_gp_id = alua_lu_gps_counter++;
c66ac9db 1128 lu_gp->lu_gp_valid_id = 1;
e3d6f909 1129 alua_lu_gps_count++;
c66ac9db
NB		 1130 }
1131
1132 return lu_gp;
1133}
1134
1135int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1136{
1137 struct t10_alua_lu_gp *lu_gp_tmp;
1138 u16 lu_gp_id_tmp;
1139 /*
1140 * The lu_gp->lu_gp_id may only be set once..
1141 */
1142 if (lu_gp->lu_gp_valid_id) {
6708bb27 1143 pr_warn("ALUA LU Group already has a valid ID,"
c66ac9db 1144 " ignoring request\n");
e3d6f909 1145 return -EINVAL;
c66ac9db
NB		 1146 }
1147
e3d6f909
AG		 1148 spin_lock(&lu_gps_lock);
1149 if (alua_lu_gps_count == 0x0000ffff) {
6708bb27 1150 pr_err("Maximum ALUA alua_lu_gps_count:"
c66ac9db 1151 " 0x0000ffff reached\n");
e3d6f909 1152 spin_unlock(&lu_gps_lock);
c66ac9db 1153 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
e3d6f909 1154 return -ENOSPC;
c66ac9db
NB		 1155 }
1156again:
1157 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
e3d6f909 1158 alua_lu_gps_counter++;
c66ac9db 1159
e3d6f909 1160 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
c66ac9db 1161 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
6708bb27 1162 if (!lu_gp_id)
c66ac9db
NB		 1163 goto again;
1164
6708bb27 1165 pr_warn("ALUA Logical Unit Group ID: %hu"
c66ac9db
NB		 1166 " already exists, ignoring request\n",
1167 lu_gp_id);
e3d6f909
AG		 1168 spin_unlock(&lu_gps_lock);
1169 return -EINVAL;
c66ac9db
NB		 1170 }
1171 }
1172
1173 lu_gp->lu_gp_id = lu_gp_id_tmp;
1174 lu_gp->lu_gp_valid_id = 1;
e3d6f909
AG		 1175 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1176 alua_lu_gps_count++;
1177 spin_unlock(&lu_gps_lock);
c66ac9db
NB		 1178
1179 return 0;
1180}
1181
1182static struct t10_alua_lu_gp_member *
1183core_alua_allocate_lu_gp_mem(struct se_device *dev)
1184{
1185 struct t10_alua_lu_gp_member *lu_gp_mem;
1186
1187 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
6708bb27
AG		 1188 if (!lu_gp_mem) {
1189 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
c66ac9db
NB		 1190 return ERR_PTR(-ENOMEM);
1191 }
1192 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1193 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1194 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1195
1196 lu_gp_mem->lu_gp_mem_dev = dev;
1197 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1198
1199 return lu_gp_mem;
1200}
1201
1202void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1203{
1204 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1205 /*
1206 * Once we have reached this point, config_item_put() has
1207 * already been called from target_core_alua_drop_lu_gp().
1208 *
1209 * Here, we remove the *lu_gp from the global list so that
1210 * no associations can be made while we are releasing
1211 * struct t10_alua_lu_gp.
1212 */
e3d6f909 1213 spin_lock(&lu_gps_lock);
e3d6f909
AG		 1214 list_del(&lu_gp->lu_gp_node);
1215 alua_lu_gps_count--;
1216 spin_unlock(&lu_gps_lock);
c66ac9db
NB		 1217 /*
1218 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1219 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1220 * released with core_alua_put_lu_gp_from_name()
1221 */
1222 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1223 cpu_relax();
1224 /*
1225 * Release reference to struct t10_alua_lu_gp * from all associated
1226 * struct se_device.
1227 */
1228 spin_lock(&lu_gp->lu_gp_lock);
1229 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1230 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1231 if (lu_gp_mem->lu_gp_assoc) {
1232 list_del(&lu_gp_mem->lu_gp_mem_list);
1233 lu_gp->lu_gp_members--;
1234 lu_gp_mem->lu_gp_assoc = 0;
1235 }
1236 spin_unlock(&lu_gp->lu_gp_lock);
1237 /*
1238 *
25985edc 1239 * lu_gp_mem is associated with a single
c66ac9db
NB		 1240 * struct se_device->dev_alua_lu_gp_mem, and is released when
1241 * struct se_device is released via core_alua_free_lu_gp_mem().
1242 *
1243 * If the passed lu_gp does NOT match the default_lu_gp, assume
1244 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1245 */
1246 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
e3d6f909 1247 if (lu_gp != default_lu_gp)
c66ac9db 1248 __core_alua_attach_lu_gp_mem(lu_gp_mem,
e3d6f909 1249 default_lu_gp);
c66ac9db
NB		 1250 else
1251 lu_gp_mem->lu_gp = NULL;
1252 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1253
1254 spin_lock(&lu_gp->lu_gp_lock);
1255 }
1256 spin_unlock(&lu_gp->lu_gp_lock);
1257
1258 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1259}
1260
1261void core_alua_free_lu_gp_mem(struct se_device *dev)
1262{
1263 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
e3d6f909 1264 struct t10_alua *alua = &su_dev->t10_alua;
c66ac9db
NB		 1265 struct t10_alua_lu_gp *lu_gp;
1266 struct t10_alua_lu_gp_member *lu_gp_mem;
1267
1268 if (alua->alua_type != SPC3_ALUA_EMULATED)
1269 return;
1270
1271 lu_gp_mem = dev->dev_alua_lu_gp_mem;
6708bb27 1272 if (!lu_gp_mem)
c66ac9db
NB		 1273 return;
1274
1275 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1276 cpu_relax();
1277
1278 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1279 lu_gp = lu_gp_mem->lu_gp;
6708bb27 1280 if (lu_gp) {
c66ac9db
NB		 1281 spin_lock(&lu_gp->lu_gp_lock);
1282 if (lu_gp_mem->lu_gp_assoc) {
1283 list_del(&lu_gp_mem->lu_gp_mem_list);
1284 lu_gp->lu_gp_members--;
1285 lu_gp_mem->lu_gp_assoc = 0;
1286 }
1287 spin_unlock(&lu_gp->lu_gp_lock);
1288 lu_gp_mem->lu_gp = NULL;
1289 }
1290 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1291
1292 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1293}
1294
1295struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1296{
1297 struct t10_alua_lu_gp *lu_gp;
1298 struct config_item *ci;
1299
e3d6f909
AG		 1300 spin_lock(&lu_gps_lock);
1301 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
6708bb27 1302 if (!lu_gp->lu_gp_valid_id)
c66ac9db
NB		 1303 continue;
1304 ci = &lu_gp->lu_gp_group.cg_item;
6708bb27 1305 if (!strcmp(config_item_name(ci), name)) {
c66ac9db 1306 atomic_inc(&lu_gp->lu_gp_ref_cnt);
e3d6f909 1307 spin_unlock(&lu_gps_lock);
c66ac9db
NB		 1308 return lu_gp;
1309 }
1310 }
e3d6f909 1311 spin_unlock(&lu_gps_lock);
c66ac9db
NB		 1312
1313 return NULL;
1314}
1315
1316void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1317{
e3d6f909 1318 spin_lock(&lu_gps_lock);
c66ac9db 1319 atomic_dec(&lu_gp->lu_gp_ref_cnt);
e3d6f909 1320 spin_unlock(&lu_gps_lock);
c66ac9db
NB		 1321}
1322
1323/*
1324 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1325 */
1326void __core_alua_attach_lu_gp_mem(
1327 struct t10_alua_lu_gp_member *lu_gp_mem,
1328 struct t10_alua_lu_gp *lu_gp)
1329{
1330 spin_lock(&lu_gp->lu_gp_lock);
1331 lu_gp_mem->lu_gp = lu_gp;
1332 lu_gp_mem->lu_gp_assoc = 1;
1333 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1334 lu_gp->lu_gp_members++;
1335 spin_unlock(&lu_gp->lu_gp_lock);
1336}
1337
1338/*
1339 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1340 */
1341void __core_alua_drop_lu_gp_mem(
1342 struct t10_alua_lu_gp_member *lu_gp_mem,
1343 struct t10_alua_lu_gp *lu_gp)
1344{
1345 spin_lock(&lu_gp->lu_gp_lock);
1346 list_del(&lu_gp_mem->lu_gp_mem_list);
1347 lu_gp_mem->lu_gp = NULL;
1348 lu_gp_mem->lu_gp_assoc = 0;
1349 lu_gp->lu_gp_members--;
1350 spin_unlock(&lu_gp->lu_gp_lock);
1351}
1352
1353struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
1354 struct se_subsystem_dev *su_dev,
1355 const char *name,
1356 int def_group)
1357{
1358 struct t10_alua_tg_pt_gp *tg_pt_gp;
1359
1360 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
6708bb27
AG		 1361 if (!tg_pt_gp) {
1362 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
c66ac9db
NB		 1363 return NULL;
1364 }
1365 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1366 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1367 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1368 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1369 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1370 tg_pt_gp->tg_pt_gp_su_dev = su_dev;
1371 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1372 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1373 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1374 /*
1375 * Enable both explict and implict ALUA support by default
1376 */
1377 tg_pt_gp->tg_pt_gp_alua_access_type =
1378 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1379 /*
1380 * Set the default Active/NonOptimized Delay in milliseconds
1381 */
1382 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1383 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
5b9a4d72 1384 tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
c66ac9db
NB		 1385
1386 if (def_group) {
e3d6f909 1387 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 1388 tg_pt_gp->tg_pt_gp_id =
e3d6f909 1389 su_dev->t10_alua.alua_tg_pt_gps_counter++;
c66ac9db 1390 tg_pt_gp->tg_pt_gp_valid_id = 1;
e3d6f909 1391 su_dev->t10_alua.alua_tg_pt_gps_count++;
c66ac9db 1392 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
e3d6f909
AG		 1393 &su_dev->t10_alua.tg_pt_gps_list);
1394 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1395 }
1396
1397 return tg_pt_gp;
1398}
1399
1400int core_alua_set_tg_pt_gp_id(
1401 struct t10_alua_tg_pt_gp *tg_pt_gp,
1402 u16 tg_pt_gp_id)
1403{
1404 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1405 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1406 u16 tg_pt_gp_id_tmp;
1407 /*
1408 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1409 */
1410 if (tg_pt_gp->tg_pt_gp_valid_id) {
6708bb27 1411 pr_warn("ALUA TG PT Group already has a valid ID,"
c66ac9db 1412 " ignoring request\n");
e3d6f909 1413 return -EINVAL;
c66ac9db
NB		 1414 }
1415
e3d6f909
AG		 1416 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1417 if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
6708bb27 1418 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
c66ac9db 1419 " 0x0000ffff reached\n");
e3d6f909 1420 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 1421 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
e3d6f909 1422 return -ENOSPC;
c66ac9db
NB		 1423 }
1424again:
1425 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
e3d6f909 1426 su_dev->t10_alua.alua_tg_pt_gps_counter++;
c66ac9db 1427
e3d6f909 1428 list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list,
c66ac9db
NB		 1429 tg_pt_gp_list) {
1430 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
6708bb27 1431 if (!tg_pt_gp_id)
c66ac9db
NB		 1432 goto again;
1433
6708bb27 1434 pr_err("ALUA Target Port Group ID: %hu already"
c66ac9db 1435 " exists, ignoring request\n", tg_pt_gp_id);
e3d6f909
AG		 1436 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1437 return -EINVAL;
c66ac9db
NB		 1438 }
1439 }
1440
1441 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1442 tg_pt_gp->tg_pt_gp_valid_id = 1;
1443 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
e3d6f909
AG		 1444 &su_dev->t10_alua.tg_pt_gps_list);
1445 su_dev->t10_alua.alua_tg_pt_gps_count++;
1446 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1447
1448 return 0;
1449}
1450
1451struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1452 struct se_port *port)
1453{
1454 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1455
1456 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1457 GFP_KERNEL);
6708bb27
AG		 1458 if (!tg_pt_gp_mem) {
1459 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
c66ac9db
NB		 1460 return ERR_PTR(-ENOMEM);
1461 }
1462 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1463 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1464 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1465
1466 tg_pt_gp_mem->tg_pt = port;
1467 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
c66ac9db
NB		 1468
1469 return tg_pt_gp_mem;
1470}
1471
1472void core_alua_free_tg_pt_gp(
1473 struct t10_alua_tg_pt_gp *tg_pt_gp)
1474{
1475 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1476 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1477 /*
1478 * Once we have reached this point, config_item_put() has already
1479 * been called from target_core_alua_drop_tg_pt_gp().
1480 *
1481 * Here we remove *tg_pt_gp from the global list so that
1482 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1483 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1484 */
e3d6f909 1485 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 1486 list_del(&tg_pt_gp->tg_pt_gp_list);
e3d6f909
AG		 1487 su_dev->t10_alua.alua_tg_pt_gps_counter--;
1488 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1489 /*
1490 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1491 * core_alua_get_tg_pt_gp_by_name() in
1492 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1493 * to be released with core_alua_put_tg_pt_gp_from_name().
1494 */
1495 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1496 cpu_relax();
1497 /*
1498 * Release reference to struct t10_alua_tg_pt_gp from all associated
1499 * struct se_port.
1500 */
1501 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1502 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1503 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1504 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1505 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1506 tg_pt_gp->tg_pt_gp_members--;
1507 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1508 }
1509 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1510 /*
25985edc 1511 * tg_pt_gp_mem is associated with a single
c66ac9db
NB		 1512 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1513 * core_alua_free_tg_pt_gp_mem().
1514 *
1515 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1516 * assume we want to re-assocate a given tg_pt_gp_mem with
1517 * default_tg_pt_gp.
1518 */
1519 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
e3d6f909 1520 if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) {
c66ac9db 1521 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
e3d6f909 1522 su_dev->t10_alua.default_tg_pt_gp);
c66ac9db
NB		 1523 } else
1524 tg_pt_gp_mem->tg_pt_gp = NULL;
1525 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1526
1527 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1528 }
1529 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1530
1531 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1532}
1533
1534void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1535{
1536 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
e3d6f909 1537 struct t10_alua *alua = &su_dev->t10_alua;
c66ac9db
NB		 1538 struct t10_alua_tg_pt_gp *tg_pt_gp;
1539 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1540
1541 if (alua->alua_type != SPC3_ALUA_EMULATED)
1542 return;
1543
1544 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
6708bb27 1545 if (!tg_pt_gp_mem)
c66ac9db
NB		 1546 return;
1547
1548 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1549 cpu_relax();
1550
1551 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1552 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
6708bb27 1553 if (tg_pt_gp) {
c66ac9db
NB		 1554 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1555 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1556 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1557 tg_pt_gp->tg_pt_gp_members--;
1558 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1559 }
1560 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1561 tg_pt_gp_mem->tg_pt_gp = NULL;
1562 }
1563 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1564
1565 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1566}
1567
1568static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1569 struct se_subsystem_dev *su_dev,
1570 const char *name)
1571{
1572 struct t10_alua_tg_pt_gp *tg_pt_gp;
1573 struct config_item *ci;
1574
e3d6f909
AG		 1575 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1576 list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
c66ac9db 1577 tg_pt_gp_list) {
6708bb27 1578 if (!tg_pt_gp->tg_pt_gp_valid_id)
c66ac9db
NB		 1579 continue;
1580 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
6708bb27 1581 if (!strcmp(config_item_name(ci), name)) {
c66ac9db 1582 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
e3d6f909 1583 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1584 return tg_pt_gp;
1585 }
1586 }
e3d6f909 1587 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1588
1589 return NULL;
1590}
1591
1592static void core_alua_put_tg_pt_gp_from_name(
1593 struct t10_alua_tg_pt_gp *tg_pt_gp)
1594{
1595 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1596
e3d6f909 1597 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db 1598 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
e3d6f909 1599 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
c66ac9db
NB		 1600}
1601
1602/*
1603 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1604 */
1605void __core_alua_attach_tg_pt_gp_mem(
1606 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1607 struct t10_alua_tg_pt_gp *tg_pt_gp)
1608{
1609 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1610 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1611 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1612 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1613 &tg_pt_gp->tg_pt_gp_mem_list);
1614 tg_pt_gp->tg_pt_gp_members++;
1615 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1616}
1617
1618/*
1619 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1620 */
1621static void __core_alua_drop_tg_pt_gp_mem(
1622 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1623 struct t10_alua_tg_pt_gp *tg_pt_gp)
1624{
1625 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1626 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1627 tg_pt_gp_mem->tg_pt_gp = NULL;
1628 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1629 tg_pt_gp->tg_pt_gp_members--;
1630 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1631}
1632
1633ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1634{
1635 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
1636 struct config_item *tg_pt_ci;
e3d6f909 1637 struct t10_alua *alua = &su_dev->t10_alua;
c66ac9db
NB		 1638 struct t10_alua_tg_pt_gp *tg_pt_gp;
1639 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1640 ssize_t len = 0;
1641
1642 if (alua->alua_type != SPC3_ALUA_EMULATED)
1643 return len;
1644
1645 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
6708bb27 1646 if (!tg_pt_gp_mem)
c66ac9db
NB		 1647 return len;
1648
1649 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1650 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
6708bb27 1651 if (tg_pt_gp) {
c66ac9db
NB		 1652 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1653 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1654 " %hu\nTG Port Primary Access State: %s\nTG Port "
1655 "Primary Access Status: %s\nTG Port Secondary Access"
1656 " State: %s\nTG Port Secondary Access Status: %s\n",
1657 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1658 core_alua_dump_state(atomic_read(
1659 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1660 core_alua_dump_status(
1661 tg_pt_gp->tg_pt_gp_alua_access_status),
1662 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1663 "Offline" : "None",
1664 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1665 }
1666 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1667
1668 return len;
1669}
1670
1671ssize_t core_alua_store_tg_pt_gp_info(
1672 struct se_port *port,
1673 const char *page,
1674 size_t count)
1675{
1676 struct se_portal_group *tpg;
1677 struct se_lun *lun;
1678 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
1679 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1680 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1681 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1682 int move = 0;
1683
1684 tpg = port->sep_tpg;
1685 lun = port->sep_lun;
1686
e3d6f909 1687 if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
6708bb27 1688 pr_warn("SPC3_ALUA_EMULATED not enabled for"
e3d6f909
AG		 1689 " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1690 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1691 config_item_name(&lun->lun_group.cg_item));
1692 return -EINVAL;
1693 }
1694
1695 if (count > TG_PT_GROUP_NAME_BUF) {
6708bb27 1696 pr_err("ALUA Target Port Group alias too large!\n");
c66ac9db
NB		 1697 return -EINVAL;
1698 }
1699 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1700 memcpy(buf, page, count);
1701 /*
1702 * Any ALUA target port group alias besides "NULL" means we will be
1703 * making a new group association.
1704 */
1705 if (strcmp(strstrip(buf), "NULL")) {
1706 /*
1707 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1708 * struct t10_alua_tg_pt_gp. This reference is released with
1709 * core_alua_put_tg_pt_gp_from_name() below.
1710 */
1711 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev,
1712 strstrip(buf));
6708bb27 1713 if (!tg_pt_gp_new)
c66ac9db
NB		 1714 return -ENODEV;
1715 }
1716 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
6708bb27 1717 if (!tg_pt_gp_mem) {
c66ac9db
NB		 1718 if (tg_pt_gp_new)
1719 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
6708bb27 1720 pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
c66ac9db
NB		 1721 return -EINVAL;
1722 }
1723
1724 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1725 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
6708bb27 1726 if (tg_pt_gp) {
c66ac9db
NB		 1727 /*
1728 * Clearing an existing tg_pt_gp association, and replacing
1729 * with the default_tg_pt_gp.
1730 */
6708bb27
AG		 1731 if (!tg_pt_gp_new) {
1732 pr_debug("Target_Core_ConfigFS: Moving"
c66ac9db
NB		 1733 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1734 " alua/%s, ID: %hu back to"
1735 " default_tg_pt_gp\n",
e3d6f909
AG		 1736 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1737 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1738 config_item_name(&lun->lun_group.cg_item),
1739 config_item_name(
1740 &tg_pt_gp->tg_pt_gp_group.cg_item),
1741 tg_pt_gp->tg_pt_gp_id);
1742
1743 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1744 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
e3d6f909 1745 su_dev->t10_alua.default_tg_pt_gp);
c66ac9db
NB		 1746 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1747
1748 return count;
1749 }
1750 /*
1751 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1752 */
1753 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1754 move = 1;
1755 }
1756 /*
1757 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1758 */
1759 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1760 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
6708bb27 1761 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
c66ac9db 1762 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
e3d6f909
AG		 1763 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1764 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1765 config_item_name(&lun->lun_group.cg_item),
1766 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1767 tg_pt_gp_new->tg_pt_gp_id);
1768
1769 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1770 return count;
1771}
1772
1773ssize_t core_alua_show_access_type(
1774 struct t10_alua_tg_pt_gp *tg_pt_gp,
1775 char *page)
1776{
1777 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1778 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1779 return sprintf(page, "Implict and Explict\n");
1780 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1781 return sprintf(page, "Implict\n");
1782 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1783 return sprintf(page, "Explict\n");
1784 else
1785 return sprintf(page, "None\n");
1786}
1787
1788ssize_t core_alua_store_access_type(
1789 struct t10_alua_tg_pt_gp *tg_pt_gp,
1790 const char *page,
1791 size_t count)
1792{
1793 unsigned long tmp;
1794 int ret;
1795
1796 ret = strict_strtoul(page, 0, &tmp);
1797 if (ret < 0) {
6708bb27 1798 pr_err("Unable to extract alua_access_type\n");
c66ac9db
NB		 1799 return -EINVAL;
1800 }
1801 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
6708bb27 1802 pr_err("Illegal value for alua_access_type:"
c66ac9db
NB		 1803 " %lu\n", tmp);
1804 return -EINVAL;
1805 }
1806 if (tmp == 3)
1807 tg_pt_gp->tg_pt_gp_alua_access_type =
1808 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1809 else if (tmp == 2)
1810 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1811 else if (tmp == 1)
1812 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1813 else
1814 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1815
1816 return count;
1817}
1818
1819ssize_t core_alua_show_nonop_delay_msecs(
1820 struct t10_alua_tg_pt_gp *tg_pt_gp,
1821 char *page)
1822{
1823 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1824}
1825
1826ssize_t core_alua_store_nonop_delay_msecs(
1827 struct t10_alua_tg_pt_gp *tg_pt_gp,
1828 const char *page,
1829 size_t count)
1830{
1831 unsigned long tmp;
1832 int ret;
1833
1834 ret = strict_strtoul(page, 0, &tmp);
1835 if (ret < 0) {
6708bb27 1836 pr_err("Unable to extract nonop_delay_msecs\n");
c66ac9db
NB		 1837 return -EINVAL;
1838 }
1839 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
6708bb27 1840 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
c66ac9db
NB		 1841 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1842 ALUA_MAX_NONOP_DELAY_MSECS);
1843 return -EINVAL;
1844 }
1845 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1846
1847 return count;
1848}
1849
1850ssize_t core_alua_show_trans_delay_msecs(
1851 struct t10_alua_tg_pt_gp *tg_pt_gp,
1852 char *page)
1853{
1854 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1855}
1856
1857ssize_t core_alua_store_trans_delay_msecs(
1858 struct t10_alua_tg_pt_gp *tg_pt_gp,
1859 const char *page,
1860 size_t count)
1861{
1862 unsigned long tmp;
1863 int ret;
1864
1865 ret = strict_strtoul(page, 0, &tmp);
1866 if (ret < 0) {
6708bb27 1867 pr_err("Unable to extract trans_delay_msecs\n");
c66ac9db
NB		 1868 return -EINVAL;
1869 }
1870 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
6708bb27 1871 pr_err("Passed trans_delay_msecs: %lu, exceeds"
c66ac9db
NB		 1872 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1873 ALUA_MAX_TRANS_DELAY_MSECS);
1874 return -EINVAL;
1875 }
1876 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1877
1878 return count;
1879}
1880
5b9a4d72
NB		 1881ssize_t core_alua_show_implict_trans_secs(
1882 struct t10_alua_tg_pt_gp *tg_pt_gp,
1883 char *page)
1884{
1885 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
1886}
1887
1888ssize_t core_alua_store_implict_trans_secs(
1889 struct t10_alua_tg_pt_gp *tg_pt_gp,
1890 const char *page,
1891 size_t count)
1892{
1893 unsigned long tmp;
1894 int ret;
1895
1896 ret = strict_strtoul(page, 0, &tmp);
1897 if (ret < 0) {
1898 pr_err("Unable to extract implict_trans_secs\n");
1899 return -EINVAL;
1900 }
1901 if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
1902 pr_err("Passed implict_trans_secs: %lu, exceeds"
1903 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
1904 ALUA_MAX_IMPLICT_TRANS_SECS);
1905 return -EINVAL;
1906 }
1907 tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
1908
1909 return count;
1910}
1911
c66ac9db
NB		 1912ssize_t core_alua_show_preferred_bit(
1913 struct t10_alua_tg_pt_gp *tg_pt_gp,
1914 char *page)
1915{
1916 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1917}
1918
1919ssize_t core_alua_store_preferred_bit(
1920 struct t10_alua_tg_pt_gp *tg_pt_gp,
1921 const char *page,
1922 size_t count)
1923{
1924 unsigned long tmp;
1925 int ret;
1926
1927 ret = strict_strtoul(page, 0, &tmp);
1928 if (ret < 0) {
6708bb27 1929 pr_err("Unable to extract preferred ALUA value\n");
c66ac9db
NB		 1930 return -EINVAL;
1931 }
1932 if ((tmp != 0) && (tmp != 1)) {
6708bb27 1933 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
c66ac9db
NB		 1934 return -EINVAL;
1935 }
1936 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1937
1938 return count;
1939}
1940
1941ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1942{
6708bb27 1943 if (!lun->lun_sep)
c66ac9db
NB		 1944 return -ENODEV;
1945
1946 return sprintf(page, "%d\n",
1947 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1948}
1949
1950ssize_t core_alua_store_offline_bit(
1951 struct se_lun *lun,
1952 const char *page,
1953 size_t count)
1954{
1955 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1956 unsigned long tmp;
1957 int ret;
1958
6708bb27 1959 if (!lun->lun_sep)
c66ac9db
NB		 1960 return -ENODEV;
1961
1962 ret = strict_strtoul(page, 0, &tmp);
1963 if (ret < 0) {
6708bb27 1964 pr_err("Unable to extract alua_tg_pt_offline value\n");
c66ac9db
NB		 1965 return -EINVAL;
1966 }
1967 if ((tmp != 0) && (tmp != 1)) {
6708bb27 1968 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
c66ac9db
NB		 1969 tmp);
1970 return -EINVAL;
1971 }
1972 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
6708bb27
AG		 1973 if (!tg_pt_gp_mem) {
1974 pr_err("Unable to locate *tg_pt_gp_mem\n");
c66ac9db
NB		 1975 return -EINVAL;
1976 }
1977
1978 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1979 lun->lun_sep, 0, (int)tmp);
1980 if (ret < 0)
1981 return -EINVAL;
1982
1983 return count;
1984}
1985
1986ssize_t core_alua_show_secondary_status(
1987 struct se_lun *lun,
1988 char *page)
1989{
1990 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1991}
1992
1993ssize_t core_alua_store_secondary_status(
1994 struct se_lun *lun,
1995 const char *page,
1996 size_t count)
1997{
1998 unsigned long tmp;
1999 int ret;
2000
2001 ret = strict_strtoul(page, 0, &tmp);
2002 if (ret < 0) {
6708bb27 2003 pr_err("Unable to extract alua_tg_pt_status\n");
c66ac9db
NB		 2004 return -EINVAL;
2005 }
2006 if ((tmp != ALUA_STATUS_NONE) &&
2007 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
2008 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
6708bb27 2009 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
c66ac9db
NB		 2010 tmp);
2011 return -EINVAL;
2012 }
2013 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2014
2015 return count;
2016}
2017
2018ssize_t core_alua_show_secondary_write_metadata(
2019 struct se_lun *lun,
2020 char *page)
2021{
2022 return sprintf(page, "%d\n",
2023 lun->lun_sep->sep_tg_pt_secondary_write_md);
2024}
2025
2026ssize_t core_alua_store_secondary_write_metadata(
2027 struct se_lun *lun,
2028 const char *page,
2029 size_t count)
2030{
2031 unsigned long tmp;
2032 int ret;
2033
2034 ret = strict_strtoul(page, 0, &tmp);
2035 if (ret < 0) {
6708bb27 2036 pr_err("Unable to extract alua_tg_pt_write_md\n");
c66ac9db
NB		 2037 return -EINVAL;
2038 }
2039 if ((tmp != 0) && (tmp != 1)) {
6708bb27 2040 pr_err("Illegal value for alua_tg_pt_write_md:"
c66ac9db
NB		 2041 " %lu\n", tmp);
2042 return -EINVAL;
2043 }
2044 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2045
2046 return count;
2047}
2048
2049int core_setup_alua(struct se_device *dev, int force_pt)
2050{
2051 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
e3d6f909 2052 struct t10_alua *alua = &su_dev->t10_alua;
c66ac9db
NB		 2053 struct t10_alua_lu_gp_member *lu_gp_mem;
2054 /*
2055 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
2056 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
2057 * cause a problem because libata and some SATA RAID HBAs appear
2058 * under Linux/SCSI, but emulate SCSI logic themselves.
2059 */
e3d6f909
AG		 2060 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
2061 !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) {
c66ac9db
NB		 2062 alua->alua_type = SPC_ALUA_PASSTHROUGH;
2063 alua->alua_state_check = &core_alua_state_check_nop;
6708bb27 2064 pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
e3d6f909 2065 " emulation\n", dev->transport->name);
c66ac9db
NB		 2066 return 0;
2067 }
2068 /*
2069 * If SPC-3 or above is reported by real or emulated struct se_device,
2070 * use emulated ALUA.
2071 */
e3d6f909 2072 if (dev->transport->get_device_rev(dev) >= SCSI_3) {
6708bb27 2073 pr_debug("%s: Enabling ALUA Emulation for SPC-3"
e3d6f909 2074 " device\n", dev->transport->name);
c66ac9db 2075 /*
25985edc 2076 * Associate this struct se_device with the default ALUA
c66ac9db
NB		 2077 * LUN Group.
2078 */
2079 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
e3d6f909
AG		 2080 if (IS_ERR(lu_gp_mem))
2081 return PTR_ERR(lu_gp_mem);
c66ac9db
NB		 2082
2083 alua->alua_type = SPC3_ALUA_EMULATED;
2084 alua->alua_state_check = &core_alua_state_check;
2085 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2086 __core_alua_attach_lu_gp_mem(lu_gp_mem,
e3d6f909 2087 default_lu_gp);
c66ac9db
NB		 2088 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2089
6708bb27 2090 pr_debug("%s: Adding to default ALUA LU Group:"
c66ac9db 2091 " core/alua/lu_gps/default_lu_gp\n",
e3d6f909 2092 dev->transport->name);
c66ac9db
NB		 2093 } else {
2094 alua->alua_type = SPC2_ALUA_DISABLED;
2095 alua->alua_state_check = &core_alua_state_check_nop;
6708bb27 2096 pr_debug("%s: Disabling ALUA Emulation for SPC-2"
e3d6f909 2097 " device\n", dev->transport->name);
c66ac9db
NB		 2098 }
2099
2100 return 0;
2101}
kernel source for telekom puls (alcatel/mediatek)