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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
27#include <linux/version.h>
28#include <linux/slab.h>
29#include <linux/spinlock.h>
30#include <linux/configfs.h>
31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33
34#include <target/target_core_base.h>
35#include <target/target_core_device.h>
36#include <target/target_core_transport.h>
37#include <target/target_core_fabric_ops.h>
38#include <target/target_core_configfs.h>
39
40#include "target_core_alua.h"
41#include "target_core_hba.h"
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
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
57/*
58 * REPORT_TARGET_PORT_GROUPS
59 *
60 * See spc4r17 section 6.27
61 */
62int core_emulate_report_target_port_groups(struct se_cmd *cmd)
63{
64 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
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;
68 unsigned char *buf;
69 u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first
70 Target port group descriptor */
71
72 buf = transport_kmap_first_data_page(cmd);
73
74 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
75 list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
76 tg_pt_gp_list) {
77 /*
78 * PREF: Preferred target port bit, determine if this
79 * bit should be set for port group.
80 */
81 if (tg_pt_gp->tg_pt_gp_pref)
82 buf[off] = 0x80;
83 /*
84 * Set the ASYMMETRIC ACCESS State
85 */
86 buf[off++] |= (atomic_read(
87 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
88 /*
89 * Set supported ASYMMETRIC ACCESS State bits
90 */
91 buf[off] = 0x80; /* T_SUP */
92 buf[off] |= 0x40; /* O_SUP */
93 buf[off] |= 0x8; /* U_SUP */
94 buf[off] |= 0x4; /* S_SUP */
95 buf[off] |= 0x2; /* AN_SUP */
96 buf[off++] |= 0x1; /* AO_SUP */
97 /*
98 * TARGET PORT GROUP
99 */
100 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
101 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
102
103 off++; /* Skip over Reserved */
104 /*
105 * STATUS CODE
106 */
107 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
108 /*
109 * Vendor Specific field
110 */
111 buf[off++] = 0x00;
112 /*
113 * TARGET PORT COUNT
114 */
115 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
116 rd_len += 8;
117
118 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
119 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
120 tg_pt_gp_mem_list) {
121 port = tg_pt_gp_mem->tg_pt;
122 /*
123 * Start Target Port descriptor format
124 *
125 * See spc4r17 section 6.2.7 Table 247
126 */
127 off += 2; /* Skip over Obsolete */
128 /*
129 * Set RELATIVE TARGET PORT IDENTIFIER
130 */
131 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
132 buf[off++] = (port->sep_rtpi & 0xff);
133 rd_len += 4;
134 }
135 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
136 }
137 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
138 /*
139 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
140 */
141 buf[0] = ((rd_len >> 24) & 0xff);
142 buf[1] = ((rd_len >> 16) & 0xff);
143 buf[2] = ((rd_len >> 8) & 0xff);
144 buf[3] = (rd_len & 0xff);
145
146 transport_kunmap_first_data_page(cmd);
147
148 return 0;
149}
150
151/*
152 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
153 *
154 * See spc4r17 section 6.35
155 */
156int core_emulate_set_target_port_groups(struct se_cmd *cmd)
157{
158 struct se_device *dev = cmd->se_dev;
159 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
160 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
161 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
162 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
163 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
164 unsigned char *buf;
165 unsigned char *ptr;
166 u32 len = 4; /* Skip over RESERVED area in header */
167 int alua_access_state, primary = 0, rc;
168 u16 tg_pt_id, rtpi;
169
170 if (!l_port)
171 return PYX_TRANSPORT_LU_COMM_FAILURE;
172
173 buf = transport_kmap_first_data_page(cmd);
174
175 /*
176 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
177 * for the local tg_pt_gp.
178 */
179 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
180 if (!l_tg_pt_gp_mem) {
181 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
182 rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
183 goto out;
184 }
185 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
186 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
187 if (!l_tg_pt_gp) {
188 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
189 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
190 rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
191 goto out;
192 }
193 rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA);
194 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
195
196 if (!rc) {
197 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
198 " while TPGS_EXPLICT_ALUA is disabled\n");
199 rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
200 goto out;
201 }
202
203 ptr = &buf[4]; /* Skip over RESERVED area in header */
204
205 while (len < cmd->data_length) {
206 alua_access_state = (ptr[0] & 0x0f);
207 /*
208 * Check the received ALUA access state, and determine if
209 * the state is a primary or secondary target port asymmetric
210 * access state.
211 */
212 rc = core_alua_check_transition(alua_access_state, &primary);
213 if (rc != 0) {
214 /*
215 * If the SET TARGET PORT GROUPS attempts to establish
216 * an invalid combination of target port asymmetric
217 * access states or attempts to establish an
218 * unsupported target port asymmetric access state,
219 * then the command shall be terminated with CHECK
220 * CONDITION status, with the sense key set to ILLEGAL
221 * REQUEST, and the additional sense code set to INVALID
222 * FIELD IN PARAMETER LIST.
223 */
224 rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
225 goto out;
226 }
227 rc = -1;
228 /*
229 * If the ASYMMETRIC ACCESS STATE field (see table 267)
230 * specifies a primary target port asymmetric access state,
231 * then the TARGET PORT GROUP OR TARGET PORT field specifies
232 * a primary target port group for which the primary target
233 * port asymmetric access state shall be changed. If the
234 * ASYMMETRIC ACCESS STATE field specifies a secondary target
235 * port asymmetric access state, then the TARGET PORT GROUP OR
236 * TARGET PORT field specifies the relative target port
237 * identifier (see 3.1.120) of the target port for which the
238 * secondary target port asymmetric access state shall be
239 * changed.
240 */
241 if (primary) {
242 tg_pt_id = ((ptr[2] << 8) & 0xff);
243 tg_pt_id |= (ptr[3] & 0xff);
244 /*
245 * Locate the matching target port group ID from
246 * the global tg_pt_gp list
247 */
248 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
249 list_for_each_entry(tg_pt_gp,
250 &su_dev->t10_alua.tg_pt_gps_list,
251 tg_pt_gp_list) {
252 if (!tg_pt_gp->tg_pt_gp_valid_id)
253 continue;
254
255 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
256 continue;
257
258 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
259 smp_mb__after_atomic_inc();
260 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
261
262 rc = core_alua_do_port_transition(tg_pt_gp,
263 dev, l_port, nacl,
264 alua_access_state, 1);
265
266 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
267 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
268 smp_mb__after_atomic_dec();
269 break;
270 }
271 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
272 /*
273 * If not matching target port group ID can be located
274 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
275 */
276 if (rc != 0) {
277 rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
278 goto out;
279 }
280 } else {
281 /*
282 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
283 * the Target Port in question for the the incoming
284 * SET_TARGET_PORT_GROUPS op.
285 */
286 rtpi = ((ptr[2] << 8) & 0xff);
287 rtpi |= (ptr[3] & 0xff);
288 /*
289 * Locate the matching relative target port identifer
290 * for the struct se_device storage object.
291 */
292 spin_lock(&dev->se_port_lock);
293 list_for_each_entry(port, &dev->dev_sep_list,
294 sep_list) {
295 if (port->sep_rtpi != rtpi)
296 continue;
297
298 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
299 spin_unlock(&dev->se_port_lock);
300
301 rc = core_alua_set_tg_pt_secondary_state(
302 tg_pt_gp_mem, port, 1, 1);
303
304 spin_lock(&dev->se_port_lock);
305 break;
306 }
307 spin_unlock(&dev->se_port_lock);
308 /*
309 * If not matching relative target port identifier can
310 * be located, throw an exception with ASCQ:
311 * INVALID_PARAMETER_LIST
312 */
313 if (rc != 0) {
314 rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
315 goto out;
316 }
317 }
318
319 ptr += 4;
320 len += 4;
321 }
322
323out:
324 transport_kunmap_first_data_page(cmd);
325
326 return 0;
327}
328
329static inline int core_alua_state_nonoptimized(
330 struct se_cmd *cmd,
331 unsigned char *cdb,
332 int nonop_delay_msecs,
333 u8 *alua_ascq)
334{
335 /*
336 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
337 * later to determine if processing of this cmd needs to be
338 * temporarily delayed for the Active/NonOptimized primary access state.
339 */
340 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
341 cmd->alua_nonop_delay = nonop_delay_msecs;
342 return 0;
343}
344
345static inline int core_alua_state_standby(
346 struct se_cmd *cmd,
347 unsigned char *cdb,
348 u8 *alua_ascq)
349{
350 /*
351 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
352 * spc4r17 section 5.9.2.4.4
353 */
354 switch (cdb[0]) {
355 case INQUIRY:
356 case LOG_SELECT:
357 case LOG_SENSE:
358 case MODE_SELECT:
359 case MODE_SENSE:
360 case REPORT_LUNS:
361 case RECEIVE_DIAGNOSTIC:
362 case SEND_DIAGNOSTIC:
363 case MAINTENANCE_IN:
364 switch (cdb[1]) {
365 case MI_REPORT_TARGET_PGS:
366 return 0;
367 default:
368 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
369 return 1;
370 }
371 case MAINTENANCE_OUT:
372 switch (cdb[1]) {
373 case MO_SET_TARGET_PGS:
374 return 0;
375 default:
376 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
377 return 1;
378 }
379 case REQUEST_SENSE:
380 case PERSISTENT_RESERVE_IN:
381 case PERSISTENT_RESERVE_OUT:
382 case READ_BUFFER:
383 case WRITE_BUFFER:
384 return 0;
385 default:
386 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
387 return 1;
388 }
389
390 return 0;
391}
392
393static inline int core_alua_state_unavailable(
394 struct se_cmd *cmd,
395 unsigned char *cdb,
396 u8 *alua_ascq)
397{
398 /*
399 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
400 * spc4r17 section 5.9.2.4.5
401 */
402 switch (cdb[0]) {
403 case INQUIRY:
404 case REPORT_LUNS:
405 case MAINTENANCE_IN:
406 switch (cdb[1]) {
407 case MI_REPORT_TARGET_PGS:
408 return 0;
409 default:
410 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
411 return 1;
412 }
413 case MAINTENANCE_OUT:
414 switch (cdb[1]) {
415 case MO_SET_TARGET_PGS:
416 return 0;
417 default:
418 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
419 return 1;
420 }
421 case REQUEST_SENSE:
422 case READ_BUFFER:
423 case WRITE_BUFFER:
424 return 0;
425 default:
426 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
427 return 1;
428 }
429
430 return 0;
431}
432
433static inline int core_alua_state_transition(
434 struct se_cmd *cmd,
435 unsigned char *cdb,
436 u8 *alua_ascq)
437{
438 /*
439 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
440 * spc4r17 section 5.9.2.5
441 */
442 switch (cdb[0]) {
443 case INQUIRY:
444 case REPORT_LUNS:
445 case MAINTENANCE_IN:
446 switch (cdb[1]) {
447 case MI_REPORT_TARGET_PGS:
448 return 0;
449 default:
450 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
451 return 1;
452 }
453 case REQUEST_SENSE:
454 case READ_BUFFER:
455 case WRITE_BUFFER:
456 return 0;
457 default:
458 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
459 return 1;
460 }
461
462 return 0;
463}
464
465/*
466 * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
467 * in transport_cmd_sequencer(). This function is assigned to
468 * struct t10_alua *->state_check() in core_setup_alua()
469 */
470static int core_alua_state_check_nop(
471 struct se_cmd *cmd,
472 unsigned char *cdb,
473 u8 *alua_ascq)
474{
475 return 0;
476}
477
478/*
479 * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
480 * This function is assigned to struct t10_alua *->state_check() in
481 * core_setup_alua()
482 *
483 * Also, this function can return three different return codes to
484 * signal transport_generic_cmd_sequencer()
485 *
486 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
487 * return 0: Used to signal success
488 * reutrn -1: Used to signal failure, and invalid cdb field
489 */
490static int core_alua_state_check(
491 struct se_cmd *cmd,
492 unsigned char *cdb,
493 u8 *alua_ascq)
494{
495 struct se_lun *lun = cmd->se_lun;
496 struct se_port *port = lun->lun_sep;
497 struct t10_alua_tg_pt_gp *tg_pt_gp;
498 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
499 int out_alua_state, nonop_delay_msecs;
500
501 if (!port)
502 return 0;
503 /*
504 * First, check for a struct se_port specific secondary ALUA target port
505 * access state: OFFLINE
506 */
507 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
508 *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
509 pr_debug("ALUA: Got secondary offline status for local"
510 " target port\n");
511 *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
512 return 1;
513 }
514 /*
515 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
516 * ALUA target port group, to obtain current ALUA access state.
517 * Otherwise look for the underlying struct se_device association with
518 * a ALUA logical unit group.
519 */
520 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
521 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
522 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
523 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
524 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
525 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
526 /*
527 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
528 * statement so the compiler knows explicitly to check this case first.
529 * For the Optimized ALUA access state case, we want to process the
530 * incoming fabric cmd ASAP..
531 */
532 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
533 return 0;
534
535 switch (out_alua_state) {
536 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
537 return core_alua_state_nonoptimized(cmd, cdb,
538 nonop_delay_msecs, alua_ascq);
539 case ALUA_ACCESS_STATE_STANDBY:
540 return core_alua_state_standby(cmd, cdb, alua_ascq);
541 case ALUA_ACCESS_STATE_UNAVAILABLE:
542 return core_alua_state_unavailable(cmd, cdb, alua_ascq);
543 case ALUA_ACCESS_STATE_TRANSITION:
544 return core_alua_state_transition(cmd, cdb, alua_ascq);
545 /*
546 * OFFLINE is a secondary ALUA target port group access state, that is
547 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
548 */
549 case ALUA_ACCESS_STATE_OFFLINE:
550 default:
551 pr_err("Unknown ALUA access state: 0x%02x\n",
552 out_alua_state);
553 return -EINVAL;
554 }
555
556 return 0;
557}
558
559/*
560 * Check implict and explict ALUA state change request.
561 */
562static int core_alua_check_transition(int state, int *primary)
563{
564 switch (state) {
565 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
566 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
567 case ALUA_ACCESS_STATE_STANDBY:
568 case ALUA_ACCESS_STATE_UNAVAILABLE:
569 /*
570 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
571 * defined as primary target port asymmetric access states.
572 */
573 *primary = 1;
574 break;
575 case ALUA_ACCESS_STATE_OFFLINE:
576 /*
577 * OFFLINE state is defined as a secondary target port
578 * asymmetric access state.
579 */
580 *primary = 0;
581 break;
582 default:
583 pr_err("Unknown ALUA access state: 0x%02x\n", state);
584 return -EINVAL;
585 }
586
587 return 0;
588}
589
590static char *core_alua_dump_state(int state)
591{
592 switch (state) {
593 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
594 return "Active/Optimized";
595 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
596 return "Active/NonOptimized";
597 case ALUA_ACCESS_STATE_STANDBY:
598 return "Standby";
599 case ALUA_ACCESS_STATE_UNAVAILABLE:
600 return "Unavailable";
601 case ALUA_ACCESS_STATE_OFFLINE:
602 return "Offline";
603 default:
604 return "Unknown";
605 }
606
607 return NULL;
608}
609
610char *core_alua_dump_status(int status)
611{
612 switch (status) {
613 case ALUA_STATUS_NONE:
614 return "None";
615 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
616 return "Altered by Explict STPG";
617 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
618 return "Altered by Implict ALUA";
619 default:
620 return "Unknown";
621 }
622
623 return NULL;
624}
625
626/*
627 * Used by fabric modules to determine when we need to delay processing
628 * for the Active/NonOptimized paths..
629 */
630int core_alua_check_nonop_delay(
631 struct se_cmd *cmd)
632{
633 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
634 return 0;
635 if (in_interrupt())
636 return 0;
637 /*
638 * The ALUA Active/NonOptimized access state delay can be disabled
639 * in via configfs with a value of zero
640 */
641 if (!cmd->alua_nonop_delay)
642 return 0;
643 /*
644 * struct se_cmd->alua_nonop_delay gets set by a target port group
645 * defined interval in core_alua_state_nonoptimized()
646 */
647 msleep_interruptible(cmd->alua_nonop_delay);
648 return 0;
649}
650EXPORT_SYMBOL(core_alua_check_nonop_delay);
651
652/*
653 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
654 *
655 */
656static int core_alua_write_tpg_metadata(
657 const char *path,
658 unsigned char *md_buf,
659 u32 md_buf_len)
660{
661 mm_segment_t old_fs;
662 struct file *file;
663 struct iovec iov[1];
664 int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
665
666 memset(iov, 0, sizeof(struct iovec));
667
668 file = filp_open(path, flags, 0600);
669 if (IS_ERR(file) || !file || !file->f_dentry) {
670 pr_err("filp_open(%s) for ALUA metadata failed\n",
671 path);
672 return -ENODEV;
673 }
674
675 iov[0].iov_base = &md_buf[0];
676 iov[0].iov_len = md_buf_len;
677
678 old_fs = get_fs();
679 set_fs(get_ds());
680 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
681 set_fs(old_fs);
682
683 if (ret < 0) {
684 pr_err("Error writing ALUA metadata file: %s\n", path);
685 filp_close(file, NULL);
686 return -EIO;
687 }
688 filp_close(file, NULL);
689
690 return 0;
691}
692
693/*
694 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
695 */
696static int core_alua_update_tpg_primary_metadata(
697 struct t10_alua_tg_pt_gp *tg_pt_gp,
698 int primary_state,
699 unsigned char *md_buf)
700{
701 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
702 struct t10_wwn *wwn = &su_dev->t10_wwn;
703 char path[ALUA_METADATA_PATH_LEN];
704 int len;
705
706 memset(path, 0, ALUA_METADATA_PATH_LEN);
707
708 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
709 "tg_pt_gp_id=%hu\n"
710 "alua_access_state=0x%02x\n"
711 "alua_access_status=0x%02x\n",
712 tg_pt_gp->tg_pt_gp_id, primary_state,
713 tg_pt_gp->tg_pt_gp_alua_access_status);
714
715 snprintf(path, ALUA_METADATA_PATH_LEN,
716 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
717 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
718
719 return core_alua_write_tpg_metadata(path, md_buf, len);
720}
721
722static int core_alua_do_transition_tg_pt(
723 struct t10_alua_tg_pt_gp *tg_pt_gp,
724 struct se_port *l_port,
725 struct se_node_acl *nacl,
726 unsigned char *md_buf,
727 int new_state,
728 int explict)
729{
730 struct se_dev_entry *se_deve;
731 struct se_lun_acl *lacl;
732 struct se_port *port;
733 struct t10_alua_tg_pt_gp_member *mem;
734 int old_state = 0;
735 /*
736 * Save the old primary ALUA access state, and set the current state
737 * to ALUA_ACCESS_STATE_TRANSITION.
738 */
739 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
740 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
741 ALUA_ACCESS_STATE_TRANSITION);
742 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
743 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
744 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
745 /*
746 * Check for the optional ALUA primary state transition delay
747 */
748 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
749 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
750
751 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
752 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
753 tg_pt_gp_mem_list) {
754 port = mem->tg_pt;
755 /*
756 * After an implicit target port asymmetric access state
757 * change, a device server shall establish a unit attention
758 * condition for the initiator port associated with every I_T
759 * nexus with the additional sense code set to ASYMMETRIC
760 * ACCESS STATE CHAGED.
761 *
762 * After an explicit target port asymmetric access state
763 * change, a device server shall establish a unit attention
764 * condition with the additional sense code set to ASYMMETRIC
765 * ACCESS STATE CHANGED for the initiator port associated with
766 * every I_T nexus other than the I_T nexus on which the SET
767 * TARGET PORT GROUPS command
768 */
769 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
770 smp_mb__after_atomic_inc();
771 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
772
773 spin_lock_bh(&port->sep_alua_lock);
774 list_for_each_entry(se_deve, &port->sep_alua_list,
775 alua_port_list) {
776 lacl = se_deve->se_lun_acl;
777 /*
778 * se_deve->se_lun_acl pointer may be NULL for a
779 * entry created without explict Node+MappedLUN ACLs
780 */
781 if (!lacl)
782 continue;
783
784 if (explict &&
785 (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
786 (l_port != NULL) && (l_port == port))
787 continue;
788
789 core_scsi3_ua_allocate(lacl->se_lun_nacl,
790 se_deve->mapped_lun, 0x2A,
791 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
792 }
793 spin_unlock_bh(&port->sep_alua_lock);
794
795 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
796 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
797 smp_mb__after_atomic_dec();
798 }
799 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
800 /*
801 * Update the ALUA metadata buf that has been allocated in
802 * core_alua_do_port_transition(), this metadata will be written
803 * to struct file.
804 *
805 * Note that there is the case where we do not want to update the
806 * metadata when the saved metadata is being parsed in userspace
807 * when setting the existing port access state and access status.
808 *
809 * Also note that the failure to write out the ALUA metadata to
810 * struct file does NOT affect the actual ALUA transition.
811 */
812 if (tg_pt_gp->tg_pt_gp_write_metadata) {
813 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
814 core_alua_update_tpg_primary_metadata(tg_pt_gp,
815 new_state, md_buf);
816 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
817 }
818 /*
819 * Set the current primary ALUA access state to the requested new state
820 */
821 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
822
823 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
824 " from primary access state %s to %s\n", (explict) ? "explict" :
825 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
826 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
827 core_alua_dump_state(new_state));
828
829 return 0;
830}
831
832int core_alua_do_port_transition(
833 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
834 struct se_device *l_dev,
835 struct se_port *l_port,
836 struct se_node_acl *l_nacl,
837 int new_state,
838 int explict)
839{
840 struct se_device *dev;
841 struct se_port *port;
842 struct se_subsystem_dev *su_dev;
843 struct se_node_acl *nacl;
844 struct t10_alua_lu_gp *lu_gp;
845 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
846 struct t10_alua_tg_pt_gp *tg_pt_gp;
847 unsigned char *md_buf;
848 int primary;
849
850 if (core_alua_check_transition(new_state, &primary) != 0)
851 return -EINVAL;
852
853 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
854 if (!md_buf) {
855 pr_err("Unable to allocate buf for ALUA metadata\n");
856 return -ENOMEM;
857 }
858
859 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
860 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
861 lu_gp = local_lu_gp_mem->lu_gp;
862 atomic_inc(&lu_gp->lu_gp_ref_cnt);
863 smp_mb__after_atomic_inc();
864 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
865 /*
866 * For storage objects that are members of the 'default_lu_gp',
867 * we only do transition on the passed *l_tp_pt_gp, and not
868 * on all of the matching target port groups IDs in default_lu_gp.
869 */
870 if (!lu_gp->lu_gp_id) {
871 /*
872 * core_alua_do_transition_tg_pt() will always return
873 * success.
874 */
875 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
876 md_buf, new_state, explict);
877 atomic_dec(&lu_gp->lu_gp_ref_cnt);
878 smp_mb__after_atomic_dec();
879 kfree(md_buf);
880 return 0;
881 }
882 /*
883 * For all other LU groups aside from 'default_lu_gp', walk all of
884 * the associated storage objects looking for a matching target port
885 * group ID from the local target port group.
886 */
887 spin_lock(&lu_gp->lu_gp_lock);
888 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
889 lu_gp_mem_list) {
890
891 dev = lu_gp_mem->lu_gp_mem_dev;
892 su_dev = dev->se_sub_dev;
893 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
894 smp_mb__after_atomic_inc();
895 spin_unlock(&lu_gp->lu_gp_lock);
896
897 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
898 list_for_each_entry(tg_pt_gp,
899 &su_dev->t10_alua.tg_pt_gps_list,
900 tg_pt_gp_list) {
901
902 if (!tg_pt_gp->tg_pt_gp_valid_id)
903 continue;
904 /*
905 * If the target behavior port asymmetric access state
906 * is changed for any target port group accessiable via
907 * a logical unit within a LU group, the target port
908 * behavior group asymmetric access states for the same
909 * target port group accessible via other logical units
910 * in that LU group will also change.
911 */
912 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
913 continue;
914
915 if (l_tg_pt_gp == tg_pt_gp) {
916 port = l_port;
917 nacl = l_nacl;
918 } else {
919 port = NULL;
920 nacl = NULL;
921 }
922 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
923 smp_mb__after_atomic_inc();
924 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
925 /*
926 * core_alua_do_transition_tg_pt() will always return
927 * success.
928 */
929 core_alua_do_transition_tg_pt(tg_pt_gp, port,
930 nacl, md_buf, new_state, explict);
931
932 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
933 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
934 smp_mb__after_atomic_dec();
935 }
936 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
937
938 spin_lock(&lu_gp->lu_gp_lock);
939 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
940 smp_mb__after_atomic_dec();
941 }
942 spin_unlock(&lu_gp->lu_gp_lock);
943
944 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
945 " Group IDs: %hu %s transition to primary state: %s\n",
946 config_item_name(&lu_gp->lu_gp_group.cg_item),
947 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
948 core_alua_dump_state(new_state));
949
950 atomic_dec(&lu_gp->lu_gp_ref_cnt);
951 smp_mb__after_atomic_dec();
952 kfree(md_buf);
953 return 0;
954}
955
956/*
957 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
958 */
959static int core_alua_update_tpg_secondary_metadata(
960 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
961 struct se_port *port,
962 unsigned char *md_buf,
963 u32 md_buf_len)
964{
965 struct se_portal_group *se_tpg = port->sep_tpg;
966 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
967 int len;
968
969 memset(path, 0, ALUA_METADATA_PATH_LEN);
970 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
971
972 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
973 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
974
975 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
976 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
977 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
978
979 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
980 "alua_tg_pt_status=0x%02x\n",
981 atomic_read(&port->sep_tg_pt_secondary_offline),
982 port->sep_tg_pt_secondary_stat);
983
984 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
985 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
986 port->sep_lun->unpacked_lun);
987
988 return core_alua_write_tpg_metadata(path, md_buf, len);
989}
990
991static int core_alua_set_tg_pt_secondary_state(
992 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
993 struct se_port *port,
994 int explict,
995 int offline)
996{
997 struct t10_alua_tg_pt_gp *tg_pt_gp;
998 unsigned char *md_buf;
999 u32 md_buf_len;
1000 int trans_delay_msecs;
1001
1002 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1003 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1004 if (!tg_pt_gp) {
1005 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1006 pr_err("Unable to complete secondary state"
1007 " transition\n");
1008 return -EINVAL;
1009 }
1010 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1011 /*
1012 * Set the secondary ALUA target port access state to OFFLINE
1013 * or release the previously secondary state for struct se_port
1014 */
1015 if (offline)
1016 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1017 else
1018 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1019
1020 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1021 port->sep_tg_pt_secondary_stat = (explict) ?
1022 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1023 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1024
1025 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1026 " to secondary access state: %s\n", (explict) ? "explict" :
1027 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1028 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1029
1030 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1031 /*
1032 * Do the optional transition delay after we set the secondary
1033 * ALUA access state.
1034 */
1035 if (trans_delay_msecs != 0)
1036 msleep_interruptible(trans_delay_msecs);
1037 /*
1038 * See if we need to update the ALUA fabric port metadata for
1039 * secondary state and status
1040 */
1041 if (port->sep_tg_pt_secondary_write_md) {
1042 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
1043 if (!md_buf) {
1044 pr_err("Unable to allocate md_buf for"
1045 " secondary ALUA access metadata\n");
1046 return -ENOMEM;
1047 }
1048 mutex_lock(&port->sep_tg_pt_md_mutex);
1049 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1050 md_buf, md_buf_len);
1051 mutex_unlock(&port->sep_tg_pt_md_mutex);
1052
1053 kfree(md_buf);
1054 }
1055
1056 return 0;
1057}
1058
1059struct t10_alua_lu_gp *
1060core_alua_allocate_lu_gp(const char *name, int def_group)
1061{
1062 struct t10_alua_lu_gp *lu_gp;
1063
1064 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1065 if (!lu_gp) {
1066 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1067 return ERR_PTR(-ENOMEM);
1068 }
1069 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1070 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1071 spin_lock_init(&lu_gp->lu_gp_lock);
1072 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1073
1074 if (def_group) {
1075 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1076 lu_gp->lu_gp_valid_id = 1;
1077 alua_lu_gps_count++;
1078 }
1079
1080 return lu_gp;
1081}
1082
1083int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1084{
1085 struct t10_alua_lu_gp *lu_gp_tmp;
1086 u16 lu_gp_id_tmp;
1087 /*
1088 * The lu_gp->lu_gp_id may only be set once..
1089 */
1090 if (lu_gp->lu_gp_valid_id) {
1091 pr_warn("ALUA LU Group already has a valid ID,"
1092 " ignoring request\n");
1093 return -EINVAL;
1094 }
1095
1096 spin_lock(&lu_gps_lock);
1097 if (alua_lu_gps_count == 0x0000ffff) {
1098 pr_err("Maximum ALUA alua_lu_gps_count:"
1099 " 0x0000ffff reached\n");
1100 spin_unlock(&lu_gps_lock);
1101 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1102 return -ENOSPC;
1103 }
1104again:
1105 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1106 alua_lu_gps_counter++;
1107
1108 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1109 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1110 if (!lu_gp_id)
1111 goto again;
1112
1113 pr_warn("ALUA Logical Unit Group ID: %hu"
1114 " already exists, ignoring request\n",
1115 lu_gp_id);
1116 spin_unlock(&lu_gps_lock);
1117 return -EINVAL;
1118 }
1119 }
1120
1121 lu_gp->lu_gp_id = lu_gp_id_tmp;
1122 lu_gp->lu_gp_valid_id = 1;
1123 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1124 alua_lu_gps_count++;
1125 spin_unlock(&lu_gps_lock);
1126
1127 return 0;
1128}
1129
1130static struct t10_alua_lu_gp_member *
1131core_alua_allocate_lu_gp_mem(struct se_device *dev)
1132{
1133 struct t10_alua_lu_gp_member *lu_gp_mem;
1134
1135 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1136 if (!lu_gp_mem) {
1137 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1138 return ERR_PTR(-ENOMEM);
1139 }
1140 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1141 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1142 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1143
1144 lu_gp_mem->lu_gp_mem_dev = dev;
1145 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1146
1147 return lu_gp_mem;
1148}
1149
1150void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1151{
1152 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1153 /*
1154 * Once we have reached this point, config_item_put() has
1155 * already been called from target_core_alua_drop_lu_gp().
1156 *
1157 * Here, we remove the *lu_gp from the global list so that
1158 * no associations can be made while we are releasing
1159 * struct t10_alua_lu_gp.
1160 */
1161 spin_lock(&lu_gps_lock);
1162 atomic_set(&lu_gp->lu_gp_shutdown, 1);
1163 list_del(&lu_gp->lu_gp_node);
1164 alua_lu_gps_count--;
1165 spin_unlock(&lu_gps_lock);
1166 /*
1167 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1168 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1169 * released with core_alua_put_lu_gp_from_name()
1170 */
1171 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1172 cpu_relax();
1173 /*
1174 * Release reference to struct t10_alua_lu_gp * from all associated
1175 * struct se_device.
1176 */
1177 spin_lock(&lu_gp->lu_gp_lock);
1178 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1179 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1180 if (lu_gp_mem->lu_gp_assoc) {
1181 list_del(&lu_gp_mem->lu_gp_mem_list);
1182 lu_gp->lu_gp_members--;
1183 lu_gp_mem->lu_gp_assoc = 0;
1184 }
1185 spin_unlock(&lu_gp->lu_gp_lock);
1186 /*
1187 *
1188 * lu_gp_mem is associated with a single
1189 * struct se_device->dev_alua_lu_gp_mem, and is released when
1190 * struct se_device is released via core_alua_free_lu_gp_mem().
1191 *
1192 * If the passed lu_gp does NOT match the default_lu_gp, assume
1193 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1194 */
1195 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1196 if (lu_gp != default_lu_gp)
1197 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1198 default_lu_gp);
1199 else
1200 lu_gp_mem->lu_gp = NULL;
1201 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1202
1203 spin_lock(&lu_gp->lu_gp_lock);
1204 }
1205 spin_unlock(&lu_gp->lu_gp_lock);
1206
1207 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1208}
1209
1210void core_alua_free_lu_gp_mem(struct se_device *dev)
1211{
1212 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1213 struct t10_alua *alua = &su_dev->t10_alua;
1214 struct t10_alua_lu_gp *lu_gp;
1215 struct t10_alua_lu_gp_member *lu_gp_mem;
1216
1217 if (alua->alua_type != SPC3_ALUA_EMULATED)
1218 return;
1219
1220 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1221 if (!lu_gp_mem)
1222 return;
1223
1224 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1225 cpu_relax();
1226
1227 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1228 lu_gp = lu_gp_mem->lu_gp;
1229 if (lu_gp) {
1230 spin_lock(&lu_gp->lu_gp_lock);
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 lu_gp_mem->lu_gp = NULL;
1238 }
1239 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1240
1241 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1242}
1243
1244struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1245{
1246 struct t10_alua_lu_gp *lu_gp;
1247 struct config_item *ci;
1248
1249 spin_lock(&lu_gps_lock);
1250 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1251 if (!lu_gp->lu_gp_valid_id)
1252 continue;
1253 ci = &lu_gp->lu_gp_group.cg_item;
1254 if (!strcmp(config_item_name(ci), name)) {
1255 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1256 spin_unlock(&lu_gps_lock);
1257 return lu_gp;
1258 }
1259 }
1260 spin_unlock(&lu_gps_lock);
1261
1262 return NULL;
1263}
1264
1265void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1266{
1267 spin_lock(&lu_gps_lock);
1268 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1269 spin_unlock(&lu_gps_lock);
1270}
1271
1272/*
1273 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1274 */
1275void __core_alua_attach_lu_gp_mem(
1276 struct t10_alua_lu_gp_member *lu_gp_mem,
1277 struct t10_alua_lu_gp *lu_gp)
1278{
1279 spin_lock(&lu_gp->lu_gp_lock);
1280 lu_gp_mem->lu_gp = lu_gp;
1281 lu_gp_mem->lu_gp_assoc = 1;
1282 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1283 lu_gp->lu_gp_members++;
1284 spin_unlock(&lu_gp->lu_gp_lock);
1285}
1286
1287/*
1288 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1289 */
1290void __core_alua_drop_lu_gp_mem(
1291 struct t10_alua_lu_gp_member *lu_gp_mem,
1292 struct t10_alua_lu_gp *lu_gp)
1293{
1294 spin_lock(&lu_gp->lu_gp_lock);
1295 list_del(&lu_gp_mem->lu_gp_mem_list);
1296 lu_gp_mem->lu_gp = NULL;
1297 lu_gp_mem->lu_gp_assoc = 0;
1298 lu_gp->lu_gp_members--;
1299 spin_unlock(&lu_gp->lu_gp_lock);
1300}
1301
1302struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
1303 struct se_subsystem_dev *su_dev,
1304 const char *name,
1305 int def_group)
1306{
1307 struct t10_alua_tg_pt_gp *tg_pt_gp;
1308
1309 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1310 if (!tg_pt_gp) {
1311 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1312 return NULL;
1313 }
1314 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1315 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1316 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1317 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1318 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1319 tg_pt_gp->tg_pt_gp_su_dev = su_dev;
1320 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1321 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1322 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1323 /*
1324 * Enable both explict and implict ALUA support by default
1325 */
1326 tg_pt_gp->tg_pt_gp_alua_access_type =
1327 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1328 /*
1329 * Set the default Active/NonOptimized Delay in milliseconds
1330 */
1331 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1332 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1333
1334 if (def_group) {
1335 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1336 tg_pt_gp->tg_pt_gp_id =
1337 su_dev->t10_alua.alua_tg_pt_gps_counter++;
1338 tg_pt_gp->tg_pt_gp_valid_id = 1;
1339 su_dev->t10_alua.alua_tg_pt_gps_count++;
1340 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1341 &su_dev->t10_alua.tg_pt_gps_list);
1342 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1343 }
1344
1345 return tg_pt_gp;
1346}
1347
1348int core_alua_set_tg_pt_gp_id(
1349 struct t10_alua_tg_pt_gp *tg_pt_gp,
1350 u16 tg_pt_gp_id)
1351{
1352 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1353 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1354 u16 tg_pt_gp_id_tmp;
1355 /*
1356 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1357 */
1358 if (tg_pt_gp->tg_pt_gp_valid_id) {
1359 pr_warn("ALUA TG PT Group already has a valid ID,"
1360 " ignoring request\n");
1361 return -EINVAL;
1362 }
1363
1364 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1365 if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1366 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1367 " 0x0000ffff reached\n");
1368 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1369 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1370 return -ENOSPC;
1371 }
1372again:
1373 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1374 su_dev->t10_alua.alua_tg_pt_gps_counter++;
1375
1376 list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list,
1377 tg_pt_gp_list) {
1378 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1379 if (!tg_pt_gp_id)
1380 goto again;
1381
1382 pr_err("ALUA Target Port Group ID: %hu already"
1383 " exists, ignoring request\n", tg_pt_gp_id);
1384 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1385 return -EINVAL;
1386 }
1387 }
1388
1389 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1390 tg_pt_gp->tg_pt_gp_valid_id = 1;
1391 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1392 &su_dev->t10_alua.tg_pt_gps_list);
1393 su_dev->t10_alua.alua_tg_pt_gps_count++;
1394 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1395
1396 return 0;
1397}
1398
1399struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1400 struct se_port *port)
1401{
1402 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1403
1404 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1405 GFP_KERNEL);
1406 if (!tg_pt_gp_mem) {
1407 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1408 return ERR_PTR(-ENOMEM);
1409 }
1410 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1411 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1412 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1413
1414 tg_pt_gp_mem->tg_pt = port;
1415 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1416 atomic_set(&port->sep_tg_pt_gp_active, 1);
1417
1418 return tg_pt_gp_mem;
1419}
1420
1421void core_alua_free_tg_pt_gp(
1422 struct t10_alua_tg_pt_gp *tg_pt_gp)
1423{
1424 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1425 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1426 /*
1427 * Once we have reached this point, config_item_put() has already
1428 * been called from target_core_alua_drop_tg_pt_gp().
1429 *
1430 * Here we remove *tg_pt_gp from the global list so that
1431 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1432 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1433 */
1434 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1435 list_del(&tg_pt_gp->tg_pt_gp_list);
1436 su_dev->t10_alua.alua_tg_pt_gps_counter--;
1437 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1438 /*
1439 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1440 * core_alua_get_tg_pt_gp_by_name() in
1441 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1442 * to be released with core_alua_put_tg_pt_gp_from_name().
1443 */
1444 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1445 cpu_relax();
1446 /*
1447 * Release reference to struct t10_alua_tg_pt_gp from all associated
1448 * struct se_port.
1449 */
1450 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1451 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1452 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1453 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1454 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1455 tg_pt_gp->tg_pt_gp_members--;
1456 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1457 }
1458 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1459 /*
1460 * tg_pt_gp_mem is associated with a single
1461 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1462 * core_alua_free_tg_pt_gp_mem().
1463 *
1464 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1465 * assume we want to re-assocate a given tg_pt_gp_mem with
1466 * default_tg_pt_gp.
1467 */
1468 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1469 if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) {
1470 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1471 su_dev->t10_alua.default_tg_pt_gp);
1472 } else
1473 tg_pt_gp_mem->tg_pt_gp = NULL;
1474 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1475
1476 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1477 }
1478 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1479
1480 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1481}
1482
1483void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1484{
1485 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
1486 struct t10_alua *alua = &su_dev->t10_alua;
1487 struct t10_alua_tg_pt_gp *tg_pt_gp;
1488 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1489
1490 if (alua->alua_type != SPC3_ALUA_EMULATED)
1491 return;
1492
1493 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1494 if (!tg_pt_gp_mem)
1495 return;
1496
1497 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1498 cpu_relax();
1499
1500 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1501 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1502 if (tg_pt_gp) {
1503 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
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 tg_pt_gp_mem->tg_pt_gp = NULL;
1511 }
1512 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1513
1514 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1515}
1516
1517static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1518 struct se_subsystem_dev *su_dev,
1519 const char *name)
1520{
1521 struct t10_alua_tg_pt_gp *tg_pt_gp;
1522 struct config_item *ci;
1523
1524 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1525 list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
1526 tg_pt_gp_list) {
1527 if (!tg_pt_gp->tg_pt_gp_valid_id)
1528 continue;
1529 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1530 if (!strcmp(config_item_name(ci), name)) {
1531 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1532 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1533 return tg_pt_gp;
1534 }
1535 }
1536 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1537
1538 return NULL;
1539}
1540
1541static void core_alua_put_tg_pt_gp_from_name(
1542 struct t10_alua_tg_pt_gp *tg_pt_gp)
1543{
1544 struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
1545
1546 spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
1547 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1548 spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
1549}
1550
1551/*
1552 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1553 */
1554void __core_alua_attach_tg_pt_gp_mem(
1555 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1556 struct t10_alua_tg_pt_gp *tg_pt_gp)
1557{
1558 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1559 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1560 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1561 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1562 &tg_pt_gp->tg_pt_gp_mem_list);
1563 tg_pt_gp->tg_pt_gp_members++;
1564 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1565}
1566
1567/*
1568 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1569 */
1570static void __core_alua_drop_tg_pt_gp_mem(
1571 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1572 struct t10_alua_tg_pt_gp *tg_pt_gp)
1573{
1574 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1575 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1576 tg_pt_gp_mem->tg_pt_gp = NULL;
1577 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1578 tg_pt_gp->tg_pt_gp_members--;
1579 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1580}
1581
1582ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1583{
1584 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
1585 struct config_item *tg_pt_ci;
1586 struct t10_alua *alua = &su_dev->t10_alua;
1587 struct t10_alua_tg_pt_gp *tg_pt_gp;
1588 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1589 ssize_t len = 0;
1590
1591 if (alua->alua_type != SPC3_ALUA_EMULATED)
1592 return len;
1593
1594 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1595 if (!tg_pt_gp_mem)
1596 return len;
1597
1598 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1599 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1600 if (tg_pt_gp) {
1601 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1602 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1603 " %hu\nTG Port Primary Access State: %s\nTG Port "
1604 "Primary Access Status: %s\nTG Port Secondary Access"
1605 " State: %s\nTG Port Secondary Access Status: %s\n",
1606 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1607 core_alua_dump_state(atomic_read(
1608 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1609 core_alua_dump_status(
1610 tg_pt_gp->tg_pt_gp_alua_access_status),
1611 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1612 "Offline" : "None",
1613 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1614 }
1615 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1616
1617 return len;
1618}
1619
1620ssize_t core_alua_store_tg_pt_gp_info(
1621 struct se_port *port,
1622 const char *page,
1623 size_t count)
1624{
1625 struct se_portal_group *tpg;
1626 struct se_lun *lun;
1627 struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
1628 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1629 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1630 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1631 int move = 0;
1632
1633 tpg = port->sep_tpg;
1634 lun = port->sep_lun;
1635
1636 if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
1637 pr_warn("SPC3_ALUA_EMULATED not enabled for"
1638 " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1639 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1640 config_item_name(&lun->lun_group.cg_item));
1641 return -EINVAL;
1642 }
1643
1644 if (count > TG_PT_GROUP_NAME_BUF) {
1645 pr_err("ALUA Target Port Group alias too large!\n");
1646 return -EINVAL;
1647 }
1648 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1649 memcpy(buf, page, count);
1650 /*
1651 * Any ALUA target port group alias besides "NULL" means we will be
1652 * making a new group association.
1653 */
1654 if (strcmp(strstrip(buf), "NULL")) {
1655 /*
1656 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1657 * struct t10_alua_tg_pt_gp. This reference is released with
1658 * core_alua_put_tg_pt_gp_from_name() below.
1659 */
1660 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev,
1661 strstrip(buf));
1662 if (!tg_pt_gp_new)
1663 return -ENODEV;
1664 }
1665 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1666 if (!tg_pt_gp_mem) {
1667 if (tg_pt_gp_new)
1668 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1669 pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
1670 return -EINVAL;
1671 }
1672
1673 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1674 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1675 if (tg_pt_gp) {
1676 /*
1677 * Clearing an existing tg_pt_gp association, and replacing
1678 * with the default_tg_pt_gp.
1679 */
1680 if (!tg_pt_gp_new) {
1681 pr_debug("Target_Core_ConfigFS: Moving"
1682 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1683 " alua/%s, ID: %hu back to"
1684 " default_tg_pt_gp\n",
1685 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1686 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1687 config_item_name(&lun->lun_group.cg_item),
1688 config_item_name(
1689 &tg_pt_gp->tg_pt_gp_group.cg_item),
1690 tg_pt_gp->tg_pt_gp_id);
1691
1692 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1693 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1694 su_dev->t10_alua.default_tg_pt_gp);
1695 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1696
1697 return count;
1698 }
1699 /*
1700 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1701 */
1702 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1703 move = 1;
1704 }
1705 /*
1706 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1707 */
1708 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1709 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1710 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1711 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1712 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1713 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1714 config_item_name(&lun->lun_group.cg_item),
1715 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1716 tg_pt_gp_new->tg_pt_gp_id);
1717
1718 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1719 return count;
1720}
1721
1722ssize_t core_alua_show_access_type(
1723 struct t10_alua_tg_pt_gp *tg_pt_gp,
1724 char *page)
1725{
1726 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1727 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1728 return sprintf(page, "Implict and Explict\n");
1729 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1730 return sprintf(page, "Implict\n");
1731 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1732 return sprintf(page, "Explict\n");
1733 else
1734 return sprintf(page, "None\n");
1735}
1736
1737ssize_t core_alua_store_access_type(
1738 struct t10_alua_tg_pt_gp *tg_pt_gp,
1739 const char *page,
1740 size_t count)
1741{
1742 unsigned long tmp;
1743 int ret;
1744
1745 ret = strict_strtoul(page, 0, &tmp);
1746 if (ret < 0) {
1747 pr_err("Unable to extract alua_access_type\n");
1748 return -EINVAL;
1749 }
1750 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
1751 pr_err("Illegal value for alua_access_type:"
1752 " %lu\n", tmp);
1753 return -EINVAL;
1754 }
1755 if (tmp == 3)
1756 tg_pt_gp->tg_pt_gp_alua_access_type =
1757 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1758 else if (tmp == 2)
1759 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1760 else if (tmp == 1)
1761 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1762 else
1763 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1764
1765 return count;
1766}
1767
1768ssize_t core_alua_show_nonop_delay_msecs(
1769 struct t10_alua_tg_pt_gp *tg_pt_gp,
1770 char *page)
1771{
1772 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1773}
1774
1775ssize_t core_alua_store_nonop_delay_msecs(
1776 struct t10_alua_tg_pt_gp *tg_pt_gp,
1777 const char *page,
1778 size_t count)
1779{
1780 unsigned long tmp;
1781 int ret;
1782
1783 ret = strict_strtoul(page, 0, &tmp);
1784 if (ret < 0) {
1785 pr_err("Unable to extract nonop_delay_msecs\n");
1786 return -EINVAL;
1787 }
1788 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
1789 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1790 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1791 ALUA_MAX_NONOP_DELAY_MSECS);
1792 return -EINVAL;
1793 }
1794 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1795
1796 return count;
1797}
1798
1799ssize_t core_alua_show_trans_delay_msecs(
1800 struct t10_alua_tg_pt_gp *tg_pt_gp,
1801 char *page)
1802{
1803 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1804}
1805
1806ssize_t core_alua_store_trans_delay_msecs(
1807 struct t10_alua_tg_pt_gp *tg_pt_gp,
1808 const char *page,
1809 size_t count)
1810{
1811 unsigned long tmp;
1812 int ret;
1813
1814 ret = strict_strtoul(page, 0, &tmp);
1815 if (ret < 0) {
1816 pr_err("Unable to extract trans_delay_msecs\n");
1817 return -EINVAL;
1818 }
1819 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
1820 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1821 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1822 ALUA_MAX_TRANS_DELAY_MSECS);
1823 return -EINVAL;
1824 }
1825 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1826
1827 return count;
1828}
1829
1830ssize_t core_alua_show_preferred_bit(
1831 struct t10_alua_tg_pt_gp *tg_pt_gp,
1832 char *page)
1833{
1834 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1835}
1836
1837ssize_t core_alua_store_preferred_bit(
1838 struct t10_alua_tg_pt_gp *tg_pt_gp,
1839 const char *page,
1840 size_t count)
1841{
1842 unsigned long tmp;
1843 int ret;
1844
1845 ret = strict_strtoul(page, 0, &tmp);
1846 if (ret < 0) {
1847 pr_err("Unable to extract preferred ALUA value\n");
1848 return -EINVAL;
1849 }
1850 if ((tmp != 0) && (tmp != 1)) {
1851 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
1852 return -EINVAL;
1853 }
1854 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1855
1856 return count;
1857}
1858
1859ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1860{
1861 if (!lun->lun_sep)
1862 return -ENODEV;
1863
1864 return sprintf(page, "%d\n",
1865 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1866}
1867
1868ssize_t core_alua_store_offline_bit(
1869 struct se_lun *lun,
1870 const char *page,
1871 size_t count)
1872{
1873 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1874 unsigned long tmp;
1875 int ret;
1876
1877 if (!lun->lun_sep)
1878 return -ENODEV;
1879
1880 ret = strict_strtoul(page, 0, &tmp);
1881 if (ret < 0) {
1882 pr_err("Unable to extract alua_tg_pt_offline value\n");
1883 return -EINVAL;
1884 }
1885 if ((tmp != 0) && (tmp != 1)) {
1886 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1887 tmp);
1888 return -EINVAL;
1889 }
1890 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
1891 if (!tg_pt_gp_mem) {
1892 pr_err("Unable to locate *tg_pt_gp_mem\n");
1893 return -EINVAL;
1894 }
1895
1896 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1897 lun->lun_sep, 0, (int)tmp);
1898 if (ret < 0)
1899 return -EINVAL;
1900
1901 return count;
1902}
1903
1904ssize_t core_alua_show_secondary_status(
1905 struct se_lun *lun,
1906 char *page)
1907{
1908 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1909}
1910
1911ssize_t core_alua_store_secondary_status(
1912 struct se_lun *lun,
1913 const char *page,
1914 size_t count)
1915{
1916 unsigned long tmp;
1917 int ret;
1918
1919 ret = strict_strtoul(page, 0, &tmp);
1920 if (ret < 0) {
1921 pr_err("Unable to extract alua_tg_pt_status\n");
1922 return -EINVAL;
1923 }
1924 if ((tmp != ALUA_STATUS_NONE) &&
1925 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
1926 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
1927 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1928 tmp);
1929 return -EINVAL;
1930 }
1931 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
1932
1933 return count;
1934}
1935
1936ssize_t core_alua_show_secondary_write_metadata(
1937 struct se_lun *lun,
1938 char *page)
1939{
1940 return sprintf(page, "%d\n",
1941 lun->lun_sep->sep_tg_pt_secondary_write_md);
1942}
1943
1944ssize_t core_alua_store_secondary_write_metadata(
1945 struct se_lun *lun,
1946 const char *page,
1947 size_t count)
1948{
1949 unsigned long tmp;
1950 int ret;
1951
1952 ret = strict_strtoul(page, 0, &tmp);
1953 if (ret < 0) {
1954 pr_err("Unable to extract alua_tg_pt_write_md\n");
1955 return -EINVAL;
1956 }
1957 if ((tmp != 0) && (tmp != 1)) {
1958 pr_err("Illegal value for alua_tg_pt_write_md:"
1959 " %lu\n", tmp);
1960 return -EINVAL;
1961 }
1962 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
1963
1964 return count;
1965}
1966
1967int core_setup_alua(struct se_device *dev, int force_pt)
1968{
1969 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1970 struct t10_alua *alua = &su_dev->t10_alua;
1971 struct t10_alua_lu_gp_member *lu_gp_mem;
1972 /*
1973 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
1974 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
1975 * cause a problem because libata and some SATA RAID HBAs appear
1976 * under Linux/SCSI, but emulate SCSI logic themselves.
1977 */
1978 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
1979 !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) {
1980 alua->alua_type = SPC_ALUA_PASSTHROUGH;
1981 alua->alua_state_check = &core_alua_state_check_nop;
1982 pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
1983 " emulation\n", dev->transport->name);
1984 return 0;
1985 }
1986 /*
1987 * If SPC-3 or above is reported by real or emulated struct se_device,
1988 * use emulated ALUA.
1989 */
1990 if (dev->transport->get_device_rev(dev) >= SCSI_3) {
1991 pr_debug("%s: Enabling ALUA Emulation for SPC-3"
1992 " device\n", dev->transport->name);
1993 /*
1994 * Associate this struct se_device with the default ALUA
1995 * LUN Group.
1996 */
1997 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
1998 if (IS_ERR(lu_gp_mem))
1999 return PTR_ERR(lu_gp_mem);
2000
2001 alua->alua_type = SPC3_ALUA_EMULATED;
2002 alua->alua_state_check = &core_alua_state_check;
2003 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2004 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2005 default_lu_gp);
2006 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2007
2008 pr_debug("%s: Adding to default ALUA LU Group:"
2009 " core/alua/lu_gps/default_lu_gp\n",
2010 dev->transport->name);
2011 } else {
2012 alua->alua_type = SPC2_ALUA_DISABLED;
2013 alua->alua_state_check = &core_alua_state_check_nop;
2014 pr_debug("%s: Disabling ALUA Emulation for SPC-2"
2015 " device\n", dev->transport->name);
2016 }
2017
2018 return 0;
2019}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * Filename: target_core_alua.c
4 *
5 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
6 *
7 * (c) Copyright 2009-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 ******************************************************************************/
12
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/configfs.h>
16#include <linux/delay.h>
17#include <linux/export.h>
18#include <linux/fcntl.h>
19#include <linux/file.h>
20#include <linux/fs.h>
21#include <scsi/scsi_proto.h>
22#include <asm/unaligned.h>
23
24#include <target/target_core_base.h>
25#include <target/target_core_backend.h>
26#include <target/target_core_fabric.h>
27
28#include "target_core_internal.h"
29#include "target_core_alua.h"
30#include "target_core_ua.h"
31
32static sense_reason_t core_alua_check_transition(int state, int valid,
33 int *primary, int explicit);
34static int core_alua_set_tg_pt_secondary_state(
35 struct se_lun *lun, int explicit, int offline);
36
37static char *core_alua_dump_state(int state);
38
39static void __target_attach_tg_pt_gp(struct se_lun *lun,
40 struct t10_alua_tg_pt_gp *tg_pt_gp);
41
42static u16 alua_lu_gps_counter;
43static u32 alua_lu_gps_count;
44
45static DEFINE_SPINLOCK(lu_gps_lock);
46static LIST_HEAD(lu_gps_list);
47
48struct t10_alua_lu_gp *default_lu_gp;
49
50/*
51 * REPORT REFERRALS
52 *
53 * See sbc3r35 section 5.23
54 */
55sense_reason_t
56target_emulate_report_referrals(struct se_cmd *cmd)
57{
58 struct se_device *dev = cmd->se_dev;
59 struct t10_alua_lba_map *map;
60 struct t10_alua_lba_map_member *map_mem;
61 unsigned char *buf;
62 u32 rd_len = 0, off;
63
64 if (cmd->data_length < 4) {
65 pr_warn("REPORT REFERRALS allocation length %u too"
66 " small\n", cmd->data_length);
67 return TCM_INVALID_CDB_FIELD;
68 }
69
70 buf = transport_kmap_data_sg(cmd);
71 if (!buf)
72 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
73
74 off = 4;
75 spin_lock(&dev->t10_alua.lba_map_lock);
76 if (list_empty(&dev->t10_alua.lba_map_list)) {
77 spin_unlock(&dev->t10_alua.lba_map_lock);
78 transport_kunmap_data_sg(cmd);
79
80 return TCM_UNSUPPORTED_SCSI_OPCODE;
81 }
82
83 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
84 lba_map_list) {
85 int desc_num = off + 3;
86 int pg_num;
87
88 off += 4;
89 if (cmd->data_length > off)
90 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
91 off += 8;
92 if (cmd->data_length > off)
93 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
94 off += 8;
95 rd_len += 20;
96 pg_num = 0;
97 list_for_each_entry(map_mem, &map->lba_map_mem_list,
98 lba_map_mem_list) {
99 int alua_state = map_mem->lba_map_mem_alua_state;
100 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
101
102 if (cmd->data_length > off)
103 buf[off] = alua_state & 0x0f;
104 off += 2;
105 if (cmd->data_length > off)
106 buf[off] = (alua_pg_id >> 8) & 0xff;
107 off++;
108 if (cmd->data_length > off)
109 buf[off] = (alua_pg_id & 0xff);
110 off++;
111 rd_len += 4;
112 pg_num++;
113 }
114 if (cmd->data_length > desc_num)
115 buf[desc_num] = pg_num;
116 }
117 spin_unlock(&dev->t10_alua.lba_map_lock);
118
119 /*
120 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
121 */
122 put_unaligned_be16(rd_len, &buf[2]);
123
124 transport_kunmap_data_sg(cmd);
125
126 target_complete_cmd(cmd, GOOD);
127 return 0;
128}
129
130/*
131 * REPORT_TARGET_PORT_GROUPS
132 *
133 * See spc4r17 section 6.27
134 */
135sense_reason_t
136target_emulate_report_target_port_groups(struct se_cmd *cmd)
137{
138 struct se_device *dev = cmd->se_dev;
139 struct t10_alua_tg_pt_gp *tg_pt_gp;
140 struct se_lun *lun;
141 unsigned char *buf;
142 u32 rd_len = 0, off;
143 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
144
145 /*
146 * Skip over RESERVED area to first Target port group descriptor
147 * depending on the PARAMETER DATA FORMAT type..
148 */
149 if (ext_hdr != 0)
150 off = 8;
151 else
152 off = 4;
153
154 if (cmd->data_length < off) {
155 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
156 " small for %s header\n", cmd->data_length,
157 (ext_hdr) ? "extended" : "normal");
158 return TCM_INVALID_CDB_FIELD;
159 }
160 buf = transport_kmap_data_sg(cmd);
161 if (!buf)
162 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
163
164 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
165 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
166 tg_pt_gp_list) {
167 /*
168 * Check if the Target port group and Target port descriptor list
169 * based on tg_pt_gp_members count will fit into the response payload.
170 * Otherwise, bump rd_len to let the initiator know we have exceeded
171 * the allocation length and the response is truncated.
172 */
173 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
174 cmd->data_length) {
175 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
176 continue;
177 }
178 /*
179 * PREF: Preferred target port bit, determine if this
180 * bit should be set for port group.
181 */
182 if (tg_pt_gp->tg_pt_gp_pref)
183 buf[off] = 0x80;
184 /*
185 * Set the ASYMMETRIC ACCESS State
186 */
187 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
188 /*
189 * Set supported ASYMMETRIC ACCESS State bits
190 */
191 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
192 /*
193 * TARGET PORT GROUP
194 */
195 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
196 off += 2;
197
198 off++; /* Skip over Reserved */
199 /*
200 * STATUS CODE
201 */
202 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
203 /*
204 * Vendor Specific field
205 */
206 buf[off++] = 0x00;
207 /*
208 * TARGET PORT COUNT
209 */
210 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
211 rd_len += 8;
212
213 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
214 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
215 lun_tg_pt_gp_link) {
216 /*
217 * Start Target Port descriptor format
218 *
219 * See spc4r17 section 6.2.7 Table 247
220 */
221 off += 2; /* Skip over Obsolete */
222 /*
223 * Set RELATIVE TARGET PORT IDENTIFIER
224 */
225 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
226 off += 2;
227 rd_len += 4;
228 }
229 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
230 }
231 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
232 /*
233 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
234 */
235 put_unaligned_be32(rd_len, &buf[0]);
236
237 /*
238 * Fill in the Extended header parameter data format if requested
239 */
240 if (ext_hdr != 0) {
241 buf[4] = 0x10;
242 /*
243 * Set the implicit transition time (in seconds) for the application
244 * client to use as a base for it's transition timeout value.
245 *
246 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
247 * this CDB was received upon to determine this value individually
248 * for ALUA target port group.
249 */
250 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
251 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
252 if (tg_pt_gp)
253 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
254 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
255 }
256 transport_kunmap_data_sg(cmd);
257
258 target_complete_cmd_with_length(cmd, GOOD, rd_len + 4);
259 return 0;
260}
261
262/*
263 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
264 *
265 * See spc4r17 section 6.35
266 */
267sense_reason_t
268target_emulate_set_target_port_groups(struct se_cmd *cmd)
269{
270 struct se_device *dev = cmd->se_dev;
271 struct se_lun *l_lun = cmd->se_lun;
272 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
273 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
274 unsigned char *buf;
275 unsigned char *ptr;
276 sense_reason_t rc = TCM_NO_SENSE;
277 u32 len = 4; /* Skip over RESERVED area in header */
278 int alua_access_state, primary = 0, valid_states;
279 u16 tg_pt_id, rtpi;
280
281 if (cmd->data_length < 4) {
282 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
283 " small\n", cmd->data_length);
284 return TCM_INVALID_PARAMETER_LIST;
285 }
286
287 buf = transport_kmap_data_sg(cmd);
288 if (!buf)
289 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
290
291 /*
292 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
293 * for the local tg_pt_gp.
294 */
295 spin_lock(&l_lun->lun_tg_pt_gp_lock);
296 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
297 if (!l_tg_pt_gp) {
298 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
299 pr_err("Unable to access l_lun->tg_pt_gp\n");
300 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
301 goto out;
302 }
303
304 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
305 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
306 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
307 " while TPGS_EXPLICIT_ALUA is disabled\n");
308 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
309 goto out;
310 }
311 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
312 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
313
314 ptr = &buf[4]; /* Skip over RESERVED area in header */
315
316 while (len < cmd->data_length) {
317 bool found = false;
318 alua_access_state = (ptr[0] & 0x0f);
319 /*
320 * Check the received ALUA access state, and determine if
321 * the state is a primary or secondary target port asymmetric
322 * access state.
323 */
324 rc = core_alua_check_transition(alua_access_state, valid_states,
325 &primary, 1);
326 if (rc) {
327 /*
328 * If the SET TARGET PORT GROUPS attempts to establish
329 * an invalid combination of target port asymmetric
330 * access states or attempts to establish an
331 * unsupported target port asymmetric access state,
332 * then the command shall be terminated with CHECK
333 * CONDITION status, with the sense key set to ILLEGAL
334 * REQUEST, and the additional sense code set to INVALID
335 * FIELD IN PARAMETER LIST.
336 */
337 goto out;
338 }
339
340 /*
341 * If the ASYMMETRIC ACCESS STATE field (see table 267)
342 * specifies a primary target port asymmetric access state,
343 * then the TARGET PORT GROUP OR TARGET PORT field specifies
344 * a primary target port group for which the primary target
345 * port asymmetric access state shall be changed. If the
346 * ASYMMETRIC ACCESS STATE field specifies a secondary target
347 * port asymmetric access state, then the TARGET PORT GROUP OR
348 * TARGET PORT field specifies the relative target port
349 * identifier (see 3.1.120) of the target port for which the
350 * secondary target port asymmetric access state shall be
351 * changed.
352 */
353 if (primary) {
354 tg_pt_id = get_unaligned_be16(ptr + 2);
355 /*
356 * Locate the matching target port group ID from
357 * the global tg_pt_gp list
358 */
359 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
360 list_for_each_entry(tg_pt_gp,
361 &dev->t10_alua.tg_pt_gps_list,
362 tg_pt_gp_list) {
363 if (!tg_pt_gp->tg_pt_gp_valid_id)
364 continue;
365
366 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
367 continue;
368
369 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
370
371 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
372
373 if (!core_alua_do_port_transition(tg_pt_gp,
374 dev, l_lun, nacl,
375 alua_access_state, 1))
376 found = true;
377
378 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
379 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
380 break;
381 }
382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
383 } else {
384 struct se_lun *lun;
385
386 /*
387 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
388 * the Target Port in question for the the incoming
389 * SET_TARGET_PORT_GROUPS op.
390 */
391 rtpi = get_unaligned_be16(ptr + 2);
392 /*
393 * Locate the matching relative target port identifier
394 * for the struct se_device storage object.
395 */
396 spin_lock(&dev->se_port_lock);
397 list_for_each_entry(lun, &dev->dev_sep_list,
398 lun_dev_link) {
399 if (lun->lun_rtpi != rtpi)
400 continue;
401
402 // XXX: racy unlock
403 spin_unlock(&dev->se_port_lock);
404
405 if (!core_alua_set_tg_pt_secondary_state(
406 lun, 1, 1))
407 found = true;
408
409 spin_lock(&dev->se_port_lock);
410 break;
411 }
412 spin_unlock(&dev->se_port_lock);
413 }
414
415 if (!found) {
416 rc = TCM_INVALID_PARAMETER_LIST;
417 goto out;
418 }
419
420 ptr += 4;
421 len += 4;
422 }
423
424out:
425 transport_kunmap_data_sg(cmd);
426 if (!rc)
427 target_complete_cmd(cmd, GOOD);
428 return rc;
429}
430
431static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
432{
433 /*
434 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
435 * The ALUA additional sense code qualifier (ASCQ) is determined
436 * by the ALUA primary or secondary access state..
437 */
438 pr_debug("[%s]: ALUA TG Port not available, "
439 "SenseKey: NOT_READY, ASC/ASCQ: "
440 "0x04/0x%02x\n",
441 cmd->se_tfo->fabric_name, alua_ascq);
442
443 cmd->scsi_asc = 0x04;
444 cmd->scsi_ascq = alua_ascq;
445}
446
447static inline void core_alua_state_nonoptimized(
448 struct se_cmd *cmd,
449 unsigned char *cdb,
450 int nonop_delay_msecs)
451{
452 /*
453 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
454 * later to determine if processing of this cmd needs to be
455 * temporarily delayed for the Active/NonOptimized primary access state.
456 */
457 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
458 cmd->alua_nonop_delay = nonop_delay_msecs;
459}
460
461static inline int core_alua_state_lba_dependent(
462 struct se_cmd *cmd,
463 struct t10_alua_tg_pt_gp *tg_pt_gp)
464{
465 struct se_device *dev = cmd->se_dev;
466 u64 segment_size, segment_mult, sectors, lba;
467
468 /* Only need to check for cdb actually containing LBAs */
469 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
470 return 0;
471
472 spin_lock(&dev->t10_alua.lba_map_lock);
473 segment_size = dev->t10_alua.lba_map_segment_size;
474 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
475 sectors = cmd->data_length / dev->dev_attrib.block_size;
476
477 lba = cmd->t_task_lba;
478 while (lba < cmd->t_task_lba + sectors) {
479 struct t10_alua_lba_map *cur_map = NULL, *map;
480 struct t10_alua_lba_map_member *map_mem;
481
482 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
483 lba_map_list) {
484 u64 start_lba, last_lba;
485 u64 first_lba = map->lba_map_first_lba;
486
487 if (segment_mult) {
488 u64 tmp = lba;
489 start_lba = do_div(tmp, segment_size * segment_mult);
490
491 last_lba = first_lba + segment_size - 1;
492 if (start_lba >= first_lba &&
493 start_lba <= last_lba) {
494 lba += segment_size;
495 cur_map = map;
496 break;
497 }
498 } else {
499 last_lba = map->lba_map_last_lba;
500 if (lba >= first_lba && lba <= last_lba) {
501 lba = last_lba + 1;
502 cur_map = map;
503 break;
504 }
505 }
506 }
507 if (!cur_map) {
508 spin_unlock(&dev->t10_alua.lba_map_lock);
509 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
510 return 1;
511 }
512 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
513 lba_map_mem_list) {
514 if (map_mem->lba_map_mem_alua_pg_id !=
515 tg_pt_gp->tg_pt_gp_id)
516 continue;
517 switch(map_mem->lba_map_mem_alua_state) {
518 case ALUA_ACCESS_STATE_STANDBY:
519 spin_unlock(&dev->t10_alua.lba_map_lock);
520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
521 return 1;
522 case ALUA_ACCESS_STATE_UNAVAILABLE:
523 spin_unlock(&dev->t10_alua.lba_map_lock);
524 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
525 return 1;
526 default:
527 break;
528 }
529 }
530 }
531 spin_unlock(&dev->t10_alua.lba_map_lock);
532 return 0;
533}
534
535static inline int core_alua_state_standby(
536 struct se_cmd *cmd,
537 unsigned char *cdb)
538{
539 /*
540 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
541 * spc4r17 section 5.9.2.4.4
542 */
543 switch (cdb[0]) {
544 case INQUIRY:
545 case LOG_SELECT:
546 case LOG_SENSE:
547 case MODE_SELECT:
548 case MODE_SENSE:
549 case REPORT_LUNS:
550 case RECEIVE_DIAGNOSTIC:
551 case SEND_DIAGNOSTIC:
552 case READ_CAPACITY:
553 return 0;
554 case SERVICE_ACTION_IN_16:
555 switch (cdb[1] & 0x1f) {
556 case SAI_READ_CAPACITY_16:
557 return 0;
558 default:
559 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
560 return 1;
561 }
562 case MAINTENANCE_IN:
563 switch (cdb[1] & 0x1f) {
564 case MI_REPORT_TARGET_PGS:
565 return 0;
566 default:
567 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
568 return 1;
569 }
570 case MAINTENANCE_OUT:
571 switch (cdb[1]) {
572 case MO_SET_TARGET_PGS:
573 return 0;
574 default:
575 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
576 return 1;
577 }
578 case REQUEST_SENSE:
579 case PERSISTENT_RESERVE_IN:
580 case PERSISTENT_RESERVE_OUT:
581 case READ_BUFFER:
582 case WRITE_BUFFER:
583 return 0;
584 default:
585 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
586 return 1;
587 }
588
589 return 0;
590}
591
592static inline int core_alua_state_unavailable(
593 struct se_cmd *cmd,
594 unsigned char *cdb)
595{
596 /*
597 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
598 * spc4r17 section 5.9.2.4.5
599 */
600 switch (cdb[0]) {
601 case INQUIRY:
602 case REPORT_LUNS:
603 return 0;
604 case MAINTENANCE_IN:
605 switch (cdb[1] & 0x1f) {
606 case MI_REPORT_TARGET_PGS:
607 return 0;
608 default:
609 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
610 return 1;
611 }
612 case MAINTENANCE_OUT:
613 switch (cdb[1]) {
614 case MO_SET_TARGET_PGS:
615 return 0;
616 default:
617 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
618 return 1;
619 }
620 case REQUEST_SENSE:
621 case READ_BUFFER:
622 case WRITE_BUFFER:
623 return 0;
624 default:
625 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
626 return 1;
627 }
628
629 return 0;
630}
631
632static inline int core_alua_state_transition(
633 struct se_cmd *cmd,
634 unsigned char *cdb)
635{
636 /*
637 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
638 * spc4r17 section 5.9.2.5
639 */
640 switch (cdb[0]) {
641 case INQUIRY:
642 case REPORT_LUNS:
643 return 0;
644 case MAINTENANCE_IN:
645 switch (cdb[1] & 0x1f) {
646 case MI_REPORT_TARGET_PGS:
647 return 0;
648 default:
649 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
650 return 1;
651 }
652 case REQUEST_SENSE:
653 case READ_BUFFER:
654 case WRITE_BUFFER:
655 return 0;
656 default:
657 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
658 return 1;
659 }
660
661 return 0;
662}
663
664/*
665 * return 1: Is used to signal LUN not accessible, and check condition/not ready
666 * return 0: Used to signal success
667 * return -1: Used to signal failure, and invalid cdb field
668 */
669sense_reason_t
670target_alua_state_check(struct se_cmd *cmd)
671{
672 struct se_device *dev = cmd->se_dev;
673 unsigned char *cdb = cmd->t_task_cdb;
674 struct se_lun *lun = cmd->se_lun;
675 struct t10_alua_tg_pt_gp *tg_pt_gp;
676 int out_alua_state, nonop_delay_msecs;
677
678 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
679 return 0;
680 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
681 return 0;
682
683 /*
684 * First, check for a struct se_port specific secondary ALUA target port
685 * access state: OFFLINE
686 */
687 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
688 pr_debug("ALUA: Got secondary offline status for local"
689 " target port\n");
690 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
691 return TCM_CHECK_CONDITION_NOT_READY;
692 }
693
694 if (!lun->lun_tg_pt_gp)
695 return 0;
696
697 spin_lock(&lun->lun_tg_pt_gp_lock);
698 tg_pt_gp = lun->lun_tg_pt_gp;
699 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
700 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
701
702 // XXX: keeps using tg_pt_gp witout reference after unlock
703 spin_unlock(&lun->lun_tg_pt_gp_lock);
704 /*
705 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
706 * statement so the compiler knows explicitly to check this case first.
707 * For the Optimized ALUA access state case, we want to process the
708 * incoming fabric cmd ASAP..
709 */
710 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
711 return 0;
712
713 switch (out_alua_state) {
714 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
715 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
716 break;
717 case ALUA_ACCESS_STATE_STANDBY:
718 if (core_alua_state_standby(cmd, cdb))
719 return TCM_CHECK_CONDITION_NOT_READY;
720 break;
721 case ALUA_ACCESS_STATE_UNAVAILABLE:
722 if (core_alua_state_unavailable(cmd, cdb))
723 return TCM_CHECK_CONDITION_NOT_READY;
724 break;
725 case ALUA_ACCESS_STATE_TRANSITION:
726 if (core_alua_state_transition(cmd, cdb))
727 return TCM_CHECK_CONDITION_NOT_READY;
728 break;
729 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
730 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
731 return TCM_CHECK_CONDITION_NOT_READY;
732 break;
733 /*
734 * OFFLINE is a secondary ALUA target port group access state, that is
735 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
736 */
737 case ALUA_ACCESS_STATE_OFFLINE:
738 default:
739 pr_err("Unknown ALUA access state: 0x%02x\n",
740 out_alua_state);
741 return TCM_INVALID_CDB_FIELD;
742 }
743
744 return 0;
745}
746
747/*
748 * Check implicit and explicit ALUA state change request.
749 */
750static sense_reason_t
751core_alua_check_transition(int state, int valid, int *primary, int explicit)
752{
753 /*
754 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
755 * defined as primary target port asymmetric access states.
756 */
757 switch (state) {
758 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
759 if (!(valid & ALUA_AO_SUP))
760 goto not_supported;
761 *primary = 1;
762 break;
763 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
764 if (!(valid & ALUA_AN_SUP))
765 goto not_supported;
766 *primary = 1;
767 break;
768 case ALUA_ACCESS_STATE_STANDBY:
769 if (!(valid & ALUA_S_SUP))
770 goto not_supported;
771 *primary = 1;
772 break;
773 case ALUA_ACCESS_STATE_UNAVAILABLE:
774 if (!(valid & ALUA_U_SUP))
775 goto not_supported;
776 *primary = 1;
777 break;
778 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
779 if (!(valid & ALUA_LBD_SUP))
780 goto not_supported;
781 *primary = 1;
782 break;
783 case ALUA_ACCESS_STATE_OFFLINE:
784 /*
785 * OFFLINE state is defined as a secondary target port
786 * asymmetric access state.
787 */
788 if (!(valid & ALUA_O_SUP))
789 goto not_supported;
790 *primary = 0;
791 break;
792 case ALUA_ACCESS_STATE_TRANSITION:
793 if (!(valid & ALUA_T_SUP) || explicit)
794 /*
795 * Transitioning is set internally and by tcmu daemon,
796 * and cannot be selected through a STPG.
797 */
798 goto not_supported;
799 *primary = 0;
800 break;
801 default:
802 pr_err("Unknown ALUA access state: 0x%02x\n", state);
803 return TCM_INVALID_PARAMETER_LIST;
804 }
805
806 return 0;
807
808not_supported:
809 pr_err("ALUA access state %s not supported",
810 core_alua_dump_state(state));
811 return TCM_INVALID_PARAMETER_LIST;
812}
813
814static char *core_alua_dump_state(int state)
815{
816 switch (state) {
817 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
818 return "Active/Optimized";
819 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
820 return "Active/NonOptimized";
821 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
822 return "LBA Dependent";
823 case ALUA_ACCESS_STATE_STANDBY:
824 return "Standby";
825 case ALUA_ACCESS_STATE_UNAVAILABLE:
826 return "Unavailable";
827 case ALUA_ACCESS_STATE_OFFLINE:
828 return "Offline";
829 case ALUA_ACCESS_STATE_TRANSITION:
830 return "Transitioning";
831 default:
832 return "Unknown";
833 }
834
835 return NULL;
836}
837
838char *core_alua_dump_status(int status)
839{
840 switch (status) {
841 case ALUA_STATUS_NONE:
842 return "None";
843 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
844 return "Altered by Explicit STPG";
845 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
846 return "Altered by Implicit ALUA";
847 default:
848 return "Unknown";
849 }
850
851 return NULL;
852}
853
854/*
855 * Used by fabric modules to determine when we need to delay processing
856 * for the Active/NonOptimized paths..
857 */
858int core_alua_check_nonop_delay(
859 struct se_cmd *cmd)
860{
861 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
862 return 0;
863 if (in_interrupt())
864 return 0;
865 /*
866 * The ALUA Active/NonOptimized access state delay can be disabled
867 * in via configfs with a value of zero
868 */
869 if (!cmd->alua_nonop_delay)
870 return 0;
871 /*
872 * struct se_cmd->alua_nonop_delay gets set by a target port group
873 * defined interval in core_alua_state_nonoptimized()
874 */
875 msleep_interruptible(cmd->alua_nonop_delay);
876 return 0;
877}
878EXPORT_SYMBOL(core_alua_check_nonop_delay);
879
880static int core_alua_write_tpg_metadata(
881 const char *path,
882 unsigned char *md_buf,
883 u32 md_buf_len)
884{
885 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
886 loff_t pos = 0;
887 int ret;
888
889 if (IS_ERR(file)) {
890 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
891 return -ENODEV;
892 }
893 ret = kernel_write(file, md_buf, md_buf_len, &pos);
894 if (ret < 0)
895 pr_err("Error writing ALUA metadata file: %s\n", path);
896 fput(file);
897 return (ret < 0) ? -EIO : 0;
898}
899
900static int core_alua_update_tpg_primary_metadata(
901 struct t10_alua_tg_pt_gp *tg_pt_gp)
902{
903 unsigned char *md_buf;
904 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
905 char *path;
906 int len, rc;
907
908 lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
909
910 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
911 if (!md_buf) {
912 pr_err("Unable to allocate buf for ALUA metadata\n");
913 return -ENOMEM;
914 }
915
916 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
917 "tg_pt_gp_id=%hu\n"
918 "alua_access_state=0x%02x\n"
919 "alua_access_status=0x%02x\n",
920 tg_pt_gp->tg_pt_gp_id,
921 tg_pt_gp->tg_pt_gp_alua_access_state,
922 tg_pt_gp->tg_pt_gp_alua_access_status);
923
924 rc = -ENOMEM;
925 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
926 &wwn->unit_serial[0],
927 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
928 if (path) {
929 rc = core_alua_write_tpg_metadata(path, md_buf, len);
930 kfree(path);
931 }
932 kfree(md_buf);
933 return rc;
934}
935
936static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
937{
938 struct se_dev_entry *se_deve;
939 struct se_lun *lun;
940 struct se_lun_acl *lacl;
941
942 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
943 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
944 lun_tg_pt_gp_link) {
945 /*
946 * After an implicit target port asymmetric access state
947 * change, a device server shall establish a unit attention
948 * condition for the initiator port associated with every I_T
949 * nexus with the additional sense code set to ASYMMETRIC
950 * ACCESS STATE CHANGED.
951 *
952 * After an explicit target port asymmetric access state
953 * change, a device server shall establish a unit attention
954 * condition with the additional sense code set to ASYMMETRIC
955 * ACCESS STATE CHANGED for the initiator port associated with
956 * every I_T nexus other than the I_T nexus on which the SET
957 * TARGET PORT GROUPS command
958 */
959 if (!percpu_ref_tryget_live(&lun->lun_ref))
960 continue;
961 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
962
963 spin_lock(&lun->lun_deve_lock);
964 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
965 lacl = rcu_dereference_check(se_deve->se_lun_acl,
966 lockdep_is_held(&lun->lun_deve_lock));
967
968 /*
969 * spc4r37 p.242:
970 * After an explicit target port asymmetric access
971 * state change, a device server shall establish a
972 * unit attention condition with the additional sense
973 * code set to ASYMMETRIC ACCESS STATE CHANGED for
974 * the initiator port associated with every I_T nexus
975 * other than the I_T nexus on which the SET TARGET
976 * PORT GROUPS command was received.
977 */
978 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
979 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
980 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
981 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
982 continue;
983
984 /*
985 * se_deve->se_lun_acl pointer may be NULL for a
986 * entry created without explicit Node+MappedLUN ACLs
987 */
988 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
989 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
990 continue;
991
992 core_scsi3_ua_allocate(se_deve, 0x2A,
993 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
994 }
995 spin_unlock(&lun->lun_deve_lock);
996
997 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
998 percpu_ref_put(&lun->lun_ref);
999 }
1000 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1001}
1002
1003static int core_alua_do_transition_tg_pt(
1004 struct t10_alua_tg_pt_gp *tg_pt_gp,
1005 int new_state,
1006 int explicit)
1007{
1008 int prev_state;
1009
1010 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1011 /* Nothing to be done here */
1012 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
1013 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1014 return 0;
1015 }
1016
1017 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
1018 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1019 return -EAGAIN;
1020 }
1021
1022 /*
1023 * Save the old primary ALUA access state, and set the current state
1024 * to ALUA_ACCESS_STATE_TRANSITION.
1025 */
1026 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1027 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1028 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1029 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1030 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1031
1032 core_alua_queue_state_change_ua(tg_pt_gp);
1033
1034 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1035 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1036 return 0;
1037 }
1038
1039 /*
1040 * Check for the optional ALUA primary state transition delay
1041 */
1042 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1043 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1044
1045 /*
1046 * Set the current primary ALUA access state to the requested new state
1047 */
1048 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1049
1050 /*
1051 * Update the ALUA metadata buf that has been allocated in
1052 * core_alua_do_port_transition(), this metadata will be written
1053 * to struct file.
1054 *
1055 * Note that there is the case where we do not want to update the
1056 * metadata when the saved metadata is being parsed in userspace
1057 * when setting the existing port access state and access status.
1058 *
1059 * Also note that the failure to write out the ALUA metadata to
1060 * struct file does NOT affect the actual ALUA transition.
1061 */
1062 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1063 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1064 }
1065
1066 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1067 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1068 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1069 tg_pt_gp->tg_pt_gp_id,
1070 core_alua_dump_state(prev_state),
1071 core_alua_dump_state(new_state));
1072
1073 core_alua_queue_state_change_ua(tg_pt_gp);
1074
1075 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1076 return 0;
1077}
1078
1079int core_alua_do_port_transition(
1080 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1081 struct se_device *l_dev,
1082 struct se_lun *l_lun,
1083 struct se_node_acl *l_nacl,
1084 int new_state,
1085 int explicit)
1086{
1087 struct se_device *dev;
1088 struct t10_alua_lu_gp *lu_gp;
1089 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1090 struct t10_alua_tg_pt_gp *tg_pt_gp;
1091 int primary, valid_states, rc = 0;
1092
1093 if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1094 return -ENODEV;
1095
1096 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1097 if (core_alua_check_transition(new_state, valid_states, &primary,
1098 explicit) != 0)
1099 return -EINVAL;
1100
1101 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1102 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1103 lu_gp = local_lu_gp_mem->lu_gp;
1104 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1105 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1106 /*
1107 * For storage objects that are members of the 'default_lu_gp',
1108 * we only do transition on the passed *l_tp_pt_gp, and not
1109 * on all of the matching target port groups IDs in default_lu_gp.
1110 */
1111 if (!lu_gp->lu_gp_id) {
1112 /*
1113 * core_alua_do_transition_tg_pt() will always return
1114 * success.
1115 */
1116 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1117 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1118 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1119 new_state, explicit);
1120 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1121 return rc;
1122 }
1123 /*
1124 * For all other LU groups aside from 'default_lu_gp', walk all of
1125 * the associated storage objects looking for a matching target port
1126 * group ID from the local target port group.
1127 */
1128 spin_lock(&lu_gp->lu_gp_lock);
1129 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1130 lu_gp_mem_list) {
1131
1132 dev = lu_gp_mem->lu_gp_mem_dev;
1133 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1134 spin_unlock(&lu_gp->lu_gp_lock);
1135
1136 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1137 list_for_each_entry(tg_pt_gp,
1138 &dev->t10_alua.tg_pt_gps_list,
1139 tg_pt_gp_list) {
1140
1141 if (!tg_pt_gp->tg_pt_gp_valid_id)
1142 continue;
1143 /*
1144 * If the target behavior port asymmetric access state
1145 * is changed for any target port group accessible via
1146 * a logical unit within a LU group, the target port
1147 * behavior group asymmetric access states for the same
1148 * target port group accessible via other logical units
1149 * in that LU group will also change.
1150 */
1151 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1152 continue;
1153
1154 if (l_tg_pt_gp == tg_pt_gp) {
1155 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1156 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1157 } else {
1158 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1159 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1160 }
1161 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1162 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1163 /*
1164 * core_alua_do_transition_tg_pt() will always return
1165 * success.
1166 */
1167 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1168 new_state, explicit);
1169
1170 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1171 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1172 if (rc)
1173 break;
1174 }
1175 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1176
1177 spin_lock(&lu_gp->lu_gp_lock);
1178 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1179 }
1180 spin_unlock(&lu_gp->lu_gp_lock);
1181
1182 if (!rc) {
1183 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1184 " Group IDs: %hu %s transition to primary state: %s\n",
1185 config_item_name(&lu_gp->lu_gp_group.cg_item),
1186 l_tg_pt_gp->tg_pt_gp_id,
1187 (explicit) ? "explicit" : "implicit",
1188 core_alua_dump_state(new_state));
1189 }
1190
1191 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1192 return rc;
1193}
1194
1195static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1196{
1197 struct se_portal_group *se_tpg = lun->lun_tpg;
1198 unsigned char *md_buf;
1199 char *path;
1200 int len, rc;
1201
1202 mutex_lock(&lun->lun_tg_pt_md_mutex);
1203
1204 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1205 if (!md_buf) {
1206 pr_err("Unable to allocate buf for ALUA metadata\n");
1207 rc = -ENOMEM;
1208 goto out_unlock;
1209 }
1210
1211 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1212 "alua_tg_pt_status=0x%02x\n",
1213 atomic_read(&lun->lun_tg_pt_secondary_offline),
1214 lun->lun_tg_pt_secondary_stat);
1215
1216 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
1217 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
1218 db_root, se_tpg->se_tpg_tfo->fabric_name,
1219 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1220 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
1221 lun->unpacked_lun);
1222 } else {
1223 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
1224 db_root, se_tpg->se_tpg_tfo->fabric_name,
1225 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1226 lun->unpacked_lun);
1227 }
1228 if (!path) {
1229 rc = -ENOMEM;
1230 goto out_free;
1231 }
1232
1233 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1234 kfree(path);
1235out_free:
1236 kfree(md_buf);
1237out_unlock:
1238 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1239 return rc;
1240}
1241
1242static int core_alua_set_tg_pt_secondary_state(
1243 struct se_lun *lun,
1244 int explicit,
1245 int offline)
1246{
1247 struct t10_alua_tg_pt_gp *tg_pt_gp;
1248 int trans_delay_msecs;
1249
1250 spin_lock(&lun->lun_tg_pt_gp_lock);
1251 tg_pt_gp = lun->lun_tg_pt_gp;
1252 if (!tg_pt_gp) {
1253 spin_unlock(&lun->lun_tg_pt_gp_lock);
1254 pr_err("Unable to complete secondary state"
1255 " transition\n");
1256 return -EINVAL;
1257 }
1258 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1259 /*
1260 * Set the secondary ALUA target port access state to OFFLINE
1261 * or release the previously secondary state for struct se_lun
1262 */
1263 if (offline)
1264 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1265 else
1266 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1267
1268 lun->lun_tg_pt_secondary_stat = (explicit) ?
1269 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1270 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1271
1272 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1273 " to secondary access state: %s\n", (explicit) ? "explicit" :
1274 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1275 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1276
1277 spin_unlock(&lun->lun_tg_pt_gp_lock);
1278 /*
1279 * Do the optional transition delay after we set the secondary
1280 * ALUA access state.
1281 */
1282 if (trans_delay_msecs != 0)
1283 msleep_interruptible(trans_delay_msecs);
1284 /*
1285 * See if we need to update the ALUA fabric port metadata for
1286 * secondary state and status
1287 */
1288 if (lun->lun_tg_pt_secondary_write_md)
1289 core_alua_update_tpg_secondary_metadata(lun);
1290
1291 return 0;
1292}
1293
1294struct t10_alua_lba_map *
1295core_alua_allocate_lba_map(struct list_head *list,
1296 u64 first_lba, u64 last_lba)
1297{
1298 struct t10_alua_lba_map *lba_map;
1299
1300 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1301 if (!lba_map) {
1302 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1303 return ERR_PTR(-ENOMEM);
1304 }
1305 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1306 lba_map->lba_map_first_lba = first_lba;
1307 lba_map->lba_map_last_lba = last_lba;
1308
1309 list_add_tail(&lba_map->lba_map_list, list);
1310 return lba_map;
1311}
1312
1313int
1314core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1315 int pg_id, int state)
1316{
1317 struct t10_alua_lba_map_member *lba_map_mem;
1318
1319 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1320 lba_map_mem_list) {
1321 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1322 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1323 return -EINVAL;
1324 }
1325 }
1326
1327 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1328 if (!lba_map_mem) {
1329 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1330 return -ENOMEM;
1331 }
1332 lba_map_mem->lba_map_mem_alua_state = state;
1333 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1334
1335 list_add_tail(&lba_map_mem->lba_map_mem_list,
1336 &lba_map->lba_map_mem_list);
1337 return 0;
1338}
1339
1340void
1341core_alua_free_lba_map(struct list_head *lba_list)
1342{
1343 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1344 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1345
1346 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1347 lba_map_list) {
1348 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1349 &lba_map->lba_map_mem_list,
1350 lba_map_mem_list) {
1351 list_del(&lba_map_mem->lba_map_mem_list);
1352 kmem_cache_free(t10_alua_lba_map_mem_cache,
1353 lba_map_mem);
1354 }
1355 list_del(&lba_map->lba_map_list);
1356 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1357 }
1358}
1359
1360void
1361core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1362 int segment_size, int segment_mult)
1363{
1364 struct list_head old_lba_map_list;
1365 struct t10_alua_tg_pt_gp *tg_pt_gp;
1366 int activate = 0, supported;
1367
1368 INIT_LIST_HEAD(&old_lba_map_list);
1369 spin_lock(&dev->t10_alua.lba_map_lock);
1370 dev->t10_alua.lba_map_segment_size = segment_size;
1371 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1372 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1373 if (lba_map_list) {
1374 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1375 activate = 1;
1376 }
1377 spin_unlock(&dev->t10_alua.lba_map_lock);
1378 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1379 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1380 tg_pt_gp_list) {
1381
1382 if (!tg_pt_gp->tg_pt_gp_valid_id)
1383 continue;
1384 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1385 if (activate)
1386 supported |= ALUA_LBD_SUP;
1387 else
1388 supported &= ~ALUA_LBD_SUP;
1389 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1390 }
1391 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1392 core_alua_free_lba_map(&old_lba_map_list);
1393}
1394
1395struct t10_alua_lu_gp *
1396core_alua_allocate_lu_gp(const char *name, int def_group)
1397{
1398 struct t10_alua_lu_gp *lu_gp;
1399
1400 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1401 if (!lu_gp) {
1402 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1403 return ERR_PTR(-ENOMEM);
1404 }
1405 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1406 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1407 spin_lock_init(&lu_gp->lu_gp_lock);
1408 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1409
1410 if (def_group) {
1411 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1412 lu_gp->lu_gp_valid_id = 1;
1413 alua_lu_gps_count++;
1414 }
1415
1416 return lu_gp;
1417}
1418
1419int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1420{
1421 struct t10_alua_lu_gp *lu_gp_tmp;
1422 u16 lu_gp_id_tmp;
1423 /*
1424 * The lu_gp->lu_gp_id may only be set once..
1425 */
1426 if (lu_gp->lu_gp_valid_id) {
1427 pr_warn("ALUA LU Group already has a valid ID,"
1428 " ignoring request\n");
1429 return -EINVAL;
1430 }
1431
1432 spin_lock(&lu_gps_lock);
1433 if (alua_lu_gps_count == 0x0000ffff) {
1434 pr_err("Maximum ALUA alua_lu_gps_count:"
1435 " 0x0000ffff reached\n");
1436 spin_unlock(&lu_gps_lock);
1437 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1438 return -ENOSPC;
1439 }
1440again:
1441 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1442 alua_lu_gps_counter++;
1443
1444 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1445 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1446 if (!lu_gp_id)
1447 goto again;
1448
1449 pr_warn("ALUA Logical Unit Group ID: %hu"
1450 " already exists, ignoring request\n",
1451 lu_gp_id);
1452 spin_unlock(&lu_gps_lock);
1453 return -EINVAL;
1454 }
1455 }
1456
1457 lu_gp->lu_gp_id = lu_gp_id_tmp;
1458 lu_gp->lu_gp_valid_id = 1;
1459 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1460 alua_lu_gps_count++;
1461 spin_unlock(&lu_gps_lock);
1462
1463 return 0;
1464}
1465
1466static struct t10_alua_lu_gp_member *
1467core_alua_allocate_lu_gp_mem(struct se_device *dev)
1468{
1469 struct t10_alua_lu_gp_member *lu_gp_mem;
1470
1471 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1472 if (!lu_gp_mem) {
1473 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1474 return ERR_PTR(-ENOMEM);
1475 }
1476 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1477 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1478 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1479
1480 lu_gp_mem->lu_gp_mem_dev = dev;
1481 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1482
1483 return lu_gp_mem;
1484}
1485
1486void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1487{
1488 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1489 /*
1490 * Once we have reached this point, config_item_put() has
1491 * already been called from target_core_alua_drop_lu_gp().
1492 *
1493 * Here, we remove the *lu_gp from the global list so that
1494 * no associations can be made while we are releasing
1495 * struct t10_alua_lu_gp.
1496 */
1497 spin_lock(&lu_gps_lock);
1498 list_del(&lu_gp->lu_gp_node);
1499 alua_lu_gps_count--;
1500 spin_unlock(&lu_gps_lock);
1501 /*
1502 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1503 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1504 * released with core_alua_put_lu_gp_from_name()
1505 */
1506 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1507 cpu_relax();
1508 /*
1509 * Release reference to struct t10_alua_lu_gp * from all associated
1510 * struct se_device.
1511 */
1512 spin_lock(&lu_gp->lu_gp_lock);
1513 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1514 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1515 if (lu_gp_mem->lu_gp_assoc) {
1516 list_del(&lu_gp_mem->lu_gp_mem_list);
1517 lu_gp->lu_gp_members--;
1518 lu_gp_mem->lu_gp_assoc = 0;
1519 }
1520 spin_unlock(&lu_gp->lu_gp_lock);
1521 /*
1522 *
1523 * lu_gp_mem is associated with a single
1524 * struct se_device->dev_alua_lu_gp_mem, and is released when
1525 * struct se_device is released via core_alua_free_lu_gp_mem().
1526 *
1527 * If the passed lu_gp does NOT match the default_lu_gp, assume
1528 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1529 */
1530 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1531 if (lu_gp != default_lu_gp)
1532 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1533 default_lu_gp);
1534 else
1535 lu_gp_mem->lu_gp = NULL;
1536 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1537
1538 spin_lock(&lu_gp->lu_gp_lock);
1539 }
1540 spin_unlock(&lu_gp->lu_gp_lock);
1541
1542 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1543}
1544
1545void core_alua_free_lu_gp_mem(struct se_device *dev)
1546{
1547 struct t10_alua_lu_gp *lu_gp;
1548 struct t10_alua_lu_gp_member *lu_gp_mem;
1549
1550 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1551 if (!lu_gp_mem)
1552 return;
1553
1554 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1555 cpu_relax();
1556
1557 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1558 lu_gp = lu_gp_mem->lu_gp;
1559 if (lu_gp) {
1560 spin_lock(&lu_gp->lu_gp_lock);
1561 if (lu_gp_mem->lu_gp_assoc) {
1562 list_del(&lu_gp_mem->lu_gp_mem_list);
1563 lu_gp->lu_gp_members--;
1564 lu_gp_mem->lu_gp_assoc = 0;
1565 }
1566 spin_unlock(&lu_gp->lu_gp_lock);
1567 lu_gp_mem->lu_gp = NULL;
1568 }
1569 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1570
1571 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1572}
1573
1574struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1575{
1576 struct t10_alua_lu_gp *lu_gp;
1577 struct config_item *ci;
1578
1579 spin_lock(&lu_gps_lock);
1580 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1581 if (!lu_gp->lu_gp_valid_id)
1582 continue;
1583 ci = &lu_gp->lu_gp_group.cg_item;
1584 if (!strcmp(config_item_name(ci), name)) {
1585 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1586 spin_unlock(&lu_gps_lock);
1587 return lu_gp;
1588 }
1589 }
1590 spin_unlock(&lu_gps_lock);
1591
1592 return NULL;
1593}
1594
1595void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1596{
1597 spin_lock(&lu_gps_lock);
1598 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1599 spin_unlock(&lu_gps_lock);
1600}
1601
1602/*
1603 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1604 */
1605void __core_alua_attach_lu_gp_mem(
1606 struct t10_alua_lu_gp_member *lu_gp_mem,
1607 struct t10_alua_lu_gp *lu_gp)
1608{
1609 spin_lock(&lu_gp->lu_gp_lock);
1610 lu_gp_mem->lu_gp = lu_gp;
1611 lu_gp_mem->lu_gp_assoc = 1;
1612 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1613 lu_gp->lu_gp_members++;
1614 spin_unlock(&lu_gp->lu_gp_lock);
1615}
1616
1617/*
1618 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1619 */
1620void __core_alua_drop_lu_gp_mem(
1621 struct t10_alua_lu_gp_member *lu_gp_mem,
1622 struct t10_alua_lu_gp *lu_gp)
1623{
1624 spin_lock(&lu_gp->lu_gp_lock);
1625 list_del(&lu_gp_mem->lu_gp_mem_list);
1626 lu_gp_mem->lu_gp = NULL;
1627 lu_gp_mem->lu_gp_assoc = 0;
1628 lu_gp->lu_gp_members--;
1629 spin_unlock(&lu_gp->lu_gp_lock);
1630}
1631
1632struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1633 const char *name, int def_group)
1634{
1635 struct t10_alua_tg_pt_gp *tg_pt_gp;
1636
1637 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1638 if (!tg_pt_gp) {
1639 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1640 return NULL;
1641 }
1642 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1643 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1644 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1645 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1646 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1647 tg_pt_gp->tg_pt_gp_dev = dev;
1648 tg_pt_gp->tg_pt_gp_alua_access_state =
1649 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1650 /*
1651 * Enable both explicit and implicit ALUA support by default
1652 */
1653 tg_pt_gp->tg_pt_gp_alua_access_type =
1654 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1655 /*
1656 * Set the default Active/NonOptimized Delay in milliseconds
1657 */
1658 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1659 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1660 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1661
1662 /*
1663 * Enable all supported states
1664 */
1665 tg_pt_gp->tg_pt_gp_alua_supported_states =
1666 ALUA_T_SUP | ALUA_O_SUP |
1667 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1668
1669 if (def_group) {
1670 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1671 tg_pt_gp->tg_pt_gp_id =
1672 dev->t10_alua.alua_tg_pt_gps_counter++;
1673 tg_pt_gp->tg_pt_gp_valid_id = 1;
1674 dev->t10_alua.alua_tg_pt_gps_count++;
1675 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1676 &dev->t10_alua.tg_pt_gps_list);
1677 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1678 }
1679
1680 return tg_pt_gp;
1681}
1682
1683int core_alua_set_tg_pt_gp_id(
1684 struct t10_alua_tg_pt_gp *tg_pt_gp,
1685 u16 tg_pt_gp_id)
1686{
1687 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1688 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1689 u16 tg_pt_gp_id_tmp;
1690
1691 /*
1692 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1693 */
1694 if (tg_pt_gp->tg_pt_gp_valid_id) {
1695 pr_warn("ALUA TG PT Group already has a valid ID,"
1696 " ignoring request\n");
1697 return -EINVAL;
1698 }
1699
1700 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1701 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1702 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1703 " 0x0000ffff reached\n");
1704 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1705 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1706 return -ENOSPC;
1707 }
1708again:
1709 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1710 dev->t10_alua.alua_tg_pt_gps_counter++;
1711
1712 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1713 tg_pt_gp_list) {
1714 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1715 if (!tg_pt_gp_id)
1716 goto again;
1717
1718 pr_err("ALUA Target Port Group ID: %hu already"
1719 " exists, ignoring request\n", tg_pt_gp_id);
1720 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1721 return -EINVAL;
1722 }
1723 }
1724
1725 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1726 tg_pt_gp->tg_pt_gp_valid_id = 1;
1727 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1728 &dev->t10_alua.tg_pt_gps_list);
1729 dev->t10_alua.alua_tg_pt_gps_count++;
1730 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1731
1732 return 0;
1733}
1734
1735void core_alua_free_tg_pt_gp(
1736 struct t10_alua_tg_pt_gp *tg_pt_gp)
1737{
1738 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1739 struct se_lun *lun, *next;
1740
1741 /*
1742 * Once we have reached this point, config_item_put() has already
1743 * been called from target_core_alua_drop_tg_pt_gp().
1744 *
1745 * Here we remove *tg_pt_gp from the global list so that
1746 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1747 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1748 */
1749 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1750 if (tg_pt_gp->tg_pt_gp_valid_id) {
1751 list_del(&tg_pt_gp->tg_pt_gp_list);
1752 dev->t10_alua.alua_tg_pt_gps_count--;
1753 }
1754 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1755
1756 /*
1757 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1758 * core_alua_get_tg_pt_gp_by_name() in
1759 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1760 * to be released with core_alua_put_tg_pt_gp_from_name().
1761 */
1762 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1763 cpu_relax();
1764
1765 /*
1766 * Release reference to struct t10_alua_tg_pt_gp from all associated
1767 * struct se_port.
1768 */
1769 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1770 list_for_each_entry_safe(lun, next,
1771 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1772 list_del_init(&lun->lun_tg_pt_gp_link);
1773 tg_pt_gp->tg_pt_gp_members--;
1774
1775 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1776 /*
1777 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1778 * assume we want to re-associate a given tg_pt_gp_mem with
1779 * default_tg_pt_gp.
1780 */
1781 spin_lock(&lun->lun_tg_pt_gp_lock);
1782 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1783 __target_attach_tg_pt_gp(lun,
1784 dev->t10_alua.default_tg_pt_gp);
1785 } else
1786 lun->lun_tg_pt_gp = NULL;
1787 spin_unlock(&lun->lun_tg_pt_gp_lock);
1788
1789 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1790 }
1791 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1792
1793 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1794}
1795
1796static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1797 struct se_device *dev, const char *name)
1798{
1799 struct t10_alua_tg_pt_gp *tg_pt_gp;
1800 struct config_item *ci;
1801
1802 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1803 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1804 tg_pt_gp_list) {
1805 if (!tg_pt_gp->tg_pt_gp_valid_id)
1806 continue;
1807 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1808 if (!strcmp(config_item_name(ci), name)) {
1809 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1810 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1811 return tg_pt_gp;
1812 }
1813 }
1814 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1815
1816 return NULL;
1817}
1818
1819static void core_alua_put_tg_pt_gp_from_name(
1820 struct t10_alua_tg_pt_gp *tg_pt_gp)
1821{
1822 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1823
1824 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1825 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1826 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1827}
1828
1829static void __target_attach_tg_pt_gp(struct se_lun *lun,
1830 struct t10_alua_tg_pt_gp *tg_pt_gp)
1831{
1832 struct se_dev_entry *se_deve;
1833
1834 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1835
1836 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1837 lun->lun_tg_pt_gp = tg_pt_gp;
1838 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1839 tg_pt_gp->tg_pt_gp_members++;
1840 spin_lock(&lun->lun_deve_lock);
1841 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1842 core_scsi3_ua_allocate(se_deve, 0x3f,
1843 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1844 spin_unlock(&lun->lun_deve_lock);
1845 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1846}
1847
1848void target_attach_tg_pt_gp(struct se_lun *lun,
1849 struct t10_alua_tg_pt_gp *tg_pt_gp)
1850{
1851 spin_lock(&lun->lun_tg_pt_gp_lock);
1852 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1853 spin_unlock(&lun->lun_tg_pt_gp_lock);
1854}
1855
1856static void __target_detach_tg_pt_gp(struct se_lun *lun,
1857 struct t10_alua_tg_pt_gp *tg_pt_gp)
1858{
1859 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1860
1861 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1862 list_del_init(&lun->lun_tg_pt_gp_link);
1863 tg_pt_gp->tg_pt_gp_members--;
1864 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1865
1866 lun->lun_tg_pt_gp = NULL;
1867}
1868
1869void target_detach_tg_pt_gp(struct se_lun *lun)
1870{
1871 struct t10_alua_tg_pt_gp *tg_pt_gp;
1872
1873 spin_lock(&lun->lun_tg_pt_gp_lock);
1874 tg_pt_gp = lun->lun_tg_pt_gp;
1875 if (tg_pt_gp)
1876 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1877 spin_unlock(&lun->lun_tg_pt_gp_lock);
1878}
1879
1880ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1881{
1882 struct config_item *tg_pt_ci;
1883 struct t10_alua_tg_pt_gp *tg_pt_gp;
1884 ssize_t len = 0;
1885
1886 spin_lock(&lun->lun_tg_pt_gp_lock);
1887 tg_pt_gp = lun->lun_tg_pt_gp;
1888 if (tg_pt_gp) {
1889 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1890 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1891 " %hu\nTG Port Primary Access State: %s\nTG Port "
1892 "Primary Access Status: %s\nTG Port Secondary Access"
1893 " State: %s\nTG Port Secondary Access Status: %s\n",
1894 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1895 core_alua_dump_state(
1896 tg_pt_gp->tg_pt_gp_alua_access_state),
1897 core_alua_dump_status(
1898 tg_pt_gp->tg_pt_gp_alua_access_status),
1899 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1900 "Offline" : "None",
1901 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1902 }
1903 spin_unlock(&lun->lun_tg_pt_gp_lock);
1904
1905 return len;
1906}
1907
1908ssize_t core_alua_store_tg_pt_gp_info(
1909 struct se_lun *lun,
1910 const char *page,
1911 size_t count)
1912{
1913 struct se_portal_group *tpg = lun->lun_tpg;
1914 /*
1915 * rcu_dereference_raw protected by se_lun->lun_group symlink
1916 * reference to se_device->dev_group.
1917 */
1918 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1919 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1920 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1921 int move = 0;
1922
1923 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1924 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1925 return -ENODEV;
1926
1927 if (count > TG_PT_GROUP_NAME_BUF) {
1928 pr_err("ALUA Target Port Group alias too large!\n");
1929 return -EINVAL;
1930 }
1931 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1932 memcpy(buf, page, count);
1933 /*
1934 * Any ALUA target port group alias besides "NULL" means we will be
1935 * making a new group association.
1936 */
1937 if (strcmp(strstrip(buf), "NULL")) {
1938 /*
1939 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1940 * struct t10_alua_tg_pt_gp. This reference is released with
1941 * core_alua_put_tg_pt_gp_from_name() below.
1942 */
1943 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1944 strstrip(buf));
1945 if (!tg_pt_gp_new)
1946 return -ENODEV;
1947 }
1948
1949 spin_lock(&lun->lun_tg_pt_gp_lock);
1950 tg_pt_gp = lun->lun_tg_pt_gp;
1951 if (tg_pt_gp) {
1952 /*
1953 * Clearing an existing tg_pt_gp association, and replacing
1954 * with the default_tg_pt_gp.
1955 */
1956 if (!tg_pt_gp_new) {
1957 pr_debug("Target_Core_ConfigFS: Moving"
1958 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1959 " alua/%s, ID: %hu back to"
1960 " default_tg_pt_gp\n",
1961 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1962 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1963 config_item_name(&lun->lun_group.cg_item),
1964 config_item_name(
1965 &tg_pt_gp->tg_pt_gp_group.cg_item),
1966 tg_pt_gp->tg_pt_gp_id);
1967
1968 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1969 __target_attach_tg_pt_gp(lun,
1970 dev->t10_alua.default_tg_pt_gp);
1971 spin_unlock(&lun->lun_tg_pt_gp_lock);
1972
1973 return count;
1974 }
1975 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1976 move = 1;
1977 }
1978
1979 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
1980 spin_unlock(&lun->lun_tg_pt_gp_lock);
1981 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1982 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1983 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1984 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1985 config_item_name(&lun->lun_group.cg_item),
1986 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1987 tg_pt_gp_new->tg_pt_gp_id);
1988
1989 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1990 return count;
1991}
1992
1993ssize_t core_alua_show_access_type(
1994 struct t10_alua_tg_pt_gp *tg_pt_gp,
1995 char *page)
1996{
1997 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
1998 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
1999 return sprintf(page, "Implicit and Explicit\n");
2000 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2001 return sprintf(page, "Implicit\n");
2002 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2003 return sprintf(page, "Explicit\n");
2004 else
2005 return sprintf(page, "None\n");
2006}
2007
2008ssize_t core_alua_store_access_type(
2009 struct t10_alua_tg_pt_gp *tg_pt_gp,
2010 const char *page,
2011 size_t count)
2012{
2013 unsigned long tmp;
2014 int ret;
2015
2016 ret = kstrtoul(page, 0, &tmp);
2017 if (ret < 0) {
2018 pr_err("Unable to extract alua_access_type\n");
2019 return ret;
2020 }
2021 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2022 pr_err("Illegal value for alua_access_type:"
2023 " %lu\n", tmp);
2024 return -EINVAL;
2025 }
2026 if (tmp == 3)
2027 tg_pt_gp->tg_pt_gp_alua_access_type =
2028 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2029 else if (tmp == 2)
2030 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2031 else if (tmp == 1)
2032 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2033 else
2034 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2035
2036 return count;
2037}
2038
2039ssize_t core_alua_show_nonop_delay_msecs(
2040 struct t10_alua_tg_pt_gp *tg_pt_gp,
2041 char *page)
2042{
2043 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2044}
2045
2046ssize_t core_alua_store_nonop_delay_msecs(
2047 struct t10_alua_tg_pt_gp *tg_pt_gp,
2048 const char *page,
2049 size_t count)
2050{
2051 unsigned long tmp;
2052 int ret;
2053
2054 ret = kstrtoul(page, 0, &tmp);
2055 if (ret < 0) {
2056 pr_err("Unable to extract nonop_delay_msecs\n");
2057 return ret;
2058 }
2059 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2060 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2061 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2062 ALUA_MAX_NONOP_DELAY_MSECS);
2063 return -EINVAL;
2064 }
2065 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2066
2067 return count;
2068}
2069
2070ssize_t core_alua_show_trans_delay_msecs(
2071 struct t10_alua_tg_pt_gp *tg_pt_gp,
2072 char *page)
2073{
2074 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2075}
2076
2077ssize_t core_alua_store_trans_delay_msecs(
2078 struct t10_alua_tg_pt_gp *tg_pt_gp,
2079 const char *page,
2080 size_t count)
2081{
2082 unsigned long tmp;
2083 int ret;
2084
2085 ret = kstrtoul(page, 0, &tmp);
2086 if (ret < 0) {
2087 pr_err("Unable to extract trans_delay_msecs\n");
2088 return ret;
2089 }
2090 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2091 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2092 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2093 ALUA_MAX_TRANS_DELAY_MSECS);
2094 return -EINVAL;
2095 }
2096 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2097
2098 return count;
2099}
2100
2101ssize_t core_alua_show_implicit_trans_secs(
2102 struct t10_alua_tg_pt_gp *tg_pt_gp,
2103 char *page)
2104{
2105 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2106}
2107
2108ssize_t core_alua_store_implicit_trans_secs(
2109 struct t10_alua_tg_pt_gp *tg_pt_gp,
2110 const char *page,
2111 size_t count)
2112{
2113 unsigned long tmp;
2114 int ret;
2115
2116 ret = kstrtoul(page, 0, &tmp);
2117 if (ret < 0) {
2118 pr_err("Unable to extract implicit_trans_secs\n");
2119 return ret;
2120 }
2121 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2122 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2123 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2124 ALUA_MAX_IMPLICIT_TRANS_SECS);
2125 return -EINVAL;
2126 }
2127 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2128
2129 return count;
2130}
2131
2132ssize_t core_alua_show_preferred_bit(
2133 struct t10_alua_tg_pt_gp *tg_pt_gp,
2134 char *page)
2135{
2136 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2137}
2138
2139ssize_t core_alua_store_preferred_bit(
2140 struct t10_alua_tg_pt_gp *tg_pt_gp,
2141 const char *page,
2142 size_t count)
2143{
2144 unsigned long tmp;
2145 int ret;
2146
2147 ret = kstrtoul(page, 0, &tmp);
2148 if (ret < 0) {
2149 pr_err("Unable to extract preferred ALUA value\n");
2150 return ret;
2151 }
2152 if ((tmp != 0) && (tmp != 1)) {
2153 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2154 return -EINVAL;
2155 }
2156 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2157
2158 return count;
2159}
2160
2161ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2162{
2163 return sprintf(page, "%d\n",
2164 atomic_read(&lun->lun_tg_pt_secondary_offline));
2165}
2166
2167ssize_t core_alua_store_offline_bit(
2168 struct se_lun *lun,
2169 const char *page,
2170 size_t count)
2171{
2172 /*
2173 * rcu_dereference_raw protected by se_lun->lun_group symlink
2174 * reference to se_device->dev_group.
2175 */
2176 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2177 unsigned long tmp;
2178 int ret;
2179
2180 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2181 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2182 return -ENODEV;
2183
2184 ret = kstrtoul(page, 0, &tmp);
2185 if (ret < 0) {
2186 pr_err("Unable to extract alua_tg_pt_offline value\n");
2187 return ret;
2188 }
2189 if ((tmp != 0) && (tmp != 1)) {
2190 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2191 tmp);
2192 return -EINVAL;
2193 }
2194
2195 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2196 if (ret < 0)
2197 return -EINVAL;
2198
2199 return count;
2200}
2201
2202ssize_t core_alua_show_secondary_status(
2203 struct se_lun *lun,
2204 char *page)
2205{
2206 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2207}
2208
2209ssize_t core_alua_store_secondary_status(
2210 struct se_lun *lun,
2211 const char *page,
2212 size_t count)
2213{
2214 unsigned long tmp;
2215 int ret;
2216
2217 ret = kstrtoul(page, 0, &tmp);
2218 if (ret < 0) {
2219 pr_err("Unable to extract alua_tg_pt_status\n");
2220 return ret;
2221 }
2222 if ((tmp != ALUA_STATUS_NONE) &&
2223 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2224 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2225 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2226 tmp);
2227 return -EINVAL;
2228 }
2229 lun->lun_tg_pt_secondary_stat = (int)tmp;
2230
2231 return count;
2232}
2233
2234ssize_t core_alua_show_secondary_write_metadata(
2235 struct se_lun *lun,
2236 char *page)
2237{
2238 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2239}
2240
2241ssize_t core_alua_store_secondary_write_metadata(
2242 struct se_lun *lun,
2243 const char *page,
2244 size_t count)
2245{
2246 unsigned long tmp;
2247 int ret;
2248
2249 ret = kstrtoul(page, 0, &tmp);
2250 if (ret < 0) {
2251 pr_err("Unable to extract alua_tg_pt_write_md\n");
2252 return ret;
2253 }
2254 if ((tmp != 0) && (tmp != 1)) {
2255 pr_err("Illegal value for alua_tg_pt_write_md:"
2256 " %lu\n", tmp);
2257 return -EINVAL;
2258 }
2259 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2260
2261 return count;
2262}
2263
2264int core_setup_alua(struct se_device *dev)
2265{
2266 if (!(dev->transport_flags &
2267 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2268 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2269 struct t10_alua_lu_gp_member *lu_gp_mem;
2270
2271 /*
2272 * Associate this struct se_device with the default ALUA
2273 * LUN Group.
2274 */
2275 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2276 if (IS_ERR(lu_gp_mem))
2277 return PTR_ERR(lu_gp_mem);
2278
2279 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2280 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2281 default_lu_gp);
2282 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2283
2284 pr_debug("%s: Adding to default ALUA LU Group:"
2285 " core/alua/lu_gps/default_lu_gp\n",
2286 dev->transport->name);
2287 }
2288
2289 return 0;
2290}