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cris: add arch/cris/include/asm/serial.h
[linux-2.6/next.git] / drivers / target / target_core_alua.c
blob98c98a3a0250c9c9b74a373ea346e58a15b32844
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
44 static int core_alua_check_transition(int state, int *primary);
45 static int core_alua_set_tg_pt_secondary_state(
46 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
47 struct se_port *port, int explict, int offline);
48
49 static u16 alua_lu_gps_counter;
50 static u32 alua_lu_gps_count;
51
52 static DEFINE_SPINLOCK(lu_gps_lock);
53 static LIST_HEAD(lu_gps_list);
54
55 struct t10_alua_lu_gp *default_lu_gp;
56
57 /*
58 * REPORT_TARGET_PORT_GROUPS
59 *
60 * See spc4r17 section 6.27
61 */
62 int 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 */
156 int 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
323 out:
324 transport_kunmap_first_data_page(cmd);
325
326 return 0;
327 }
328
329 static 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
345 static 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
393 static 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
433 static 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 */
470 static 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 */
490 static 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 */
562 static 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
590 static 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
610 char *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 */
630 int 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 }
650 EXPORT_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 */
656 static 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 */
696 static 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
722 static 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
832 int 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 */
959 static 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
991 static 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
1059 struct t10_alua_lu_gp *
1060 core_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
1083 int 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 }
1104 again:
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
1130 static struct t10_alua_lu_gp_member *
1131 core_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
1150 void 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
1210 void 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
1244 struct 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
1265 void 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 */
1275 void __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 */
1290 void __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
1302 struct 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
1348 int 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 }
1372 again:
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
1399 struct 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
1421 void 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
1483 void 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
1517 static 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
1541 static 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 */
1554 void __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 */
1570 static 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
1582 ssize_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
1620 ssize_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
1722 ssize_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
1737 ssize_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
1768 ssize_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
1775 ssize_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
1799 ssize_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
1806 ssize_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
1830 ssize_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
1837 ssize_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
1859 ssize_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
1868 ssize_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
1904 ssize_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
1911 ssize_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
1936 ssize_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
1944 ssize_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
1967 int 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 }
linux-next