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nilfs2: unbreak compat ioctl
[zen-stable.git] / drivers / target / target_core_pr.c
blob95dee7074aeb5eb05f630fdded543e948ac206b3
1 /*******************************************************************************
2 * Filename: target_core_pr.c
3 *
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
6 *
7 * Copyright (c) 2009, 2010 Rising Tide Systems
8 * Copyright (c) 2009, 2010 Linux-iSCSI.org
9 *
10 * Nicholas A. Bellinger <nab@kernel.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 *
26 ******************************************************************************/
27
28 #include <linux/slab.h>
29 #include <linux/spinlock.h>
30 #include <linux/list.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_device.h>
37 #include <target/target_core_tmr.h>
38 #include <target/target_core_tpg.h>
39 #include <target/target_core_transport.h>
40 #include <target/target_core_fabric_ops.h>
41 #include <target/target_core_configfs.h>
42
43 #include "target_core_hba.h"
44 #include "target_core_pr.h"
45 #include "target_core_ua.h"
46
47 /*
48 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
49 */
50 struct pr_transport_id_holder {
51 int dest_local_nexus;
52 struct t10_pr_registration *dest_pr_reg;
53 struct se_portal_group *dest_tpg;
54 struct se_node_acl *dest_node_acl;
55 struct se_dev_entry *dest_se_deve;
56 struct list_head dest_list;
57 };
58
59 int core_pr_dump_initiator_port(
60 struct t10_pr_registration *pr_reg,
61 char *buf,
62 u32 size)
63 {
64 if (!pr_reg->isid_present_at_reg)
65 return 0;
66
67 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
68 return 1;
69 }
70
71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
72 struct t10_pr_registration *, int);
73
74 static int core_scsi2_reservation_seq_non_holder(
75 struct se_cmd *cmd,
76 unsigned char *cdb,
77 u32 pr_reg_type)
78 {
79 switch (cdb[0]) {
80 case INQUIRY:
81 case RELEASE:
82 case RELEASE_10:
83 return 0;
84 default:
85 return 1;
86 }
87
88 return 1;
89 }
90
91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
92 {
93 struct se_device *dev = cmd->se_dev;
94 struct se_session *sess = cmd->se_sess;
95 int ret;
96
97 if (!sess)
98 return 0;
99
100 spin_lock(&dev->dev_reservation_lock);
101 if (!dev->dev_reserved_node_acl || !sess) {
102 spin_unlock(&dev->dev_reservation_lock);
103 return 0;
104 }
105 if (dev->dev_reserved_node_acl != sess->se_node_acl) {
106 spin_unlock(&dev->dev_reservation_lock);
107 return -EINVAL;
108 }
109 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
110 spin_unlock(&dev->dev_reservation_lock);
111 return 0;
112 }
113 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
114 spin_unlock(&dev->dev_reservation_lock);
115
116 return ret;
117 }
118
119 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
120 struct se_node_acl *, struct se_session *);
121 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
122
123 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
124 {
125 struct se_session *se_sess = cmd->se_sess;
126 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
127 struct t10_pr_registration *pr_reg;
128 struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
129 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
130 int conflict = 0;
131
132 if (!crh)
133 return false;
134
135 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
136 se_sess);
137 if (pr_reg) {
138 /*
139 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
140 * behavior
141 *
142 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
143 * status, but no reservation shall be established and the
144 * persistent reservation shall not be changed, if the command
145 * is received from a) and b) below.
146 *
147 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
148 * status, but the persistent reservation shall not be released,
149 * if the command is received from a) and b)
150 *
151 * a) An I_T nexus that is a persistent reservation holder; or
152 * b) An I_T nexus that is registered if a registrants only or
153 * all registrants type persistent reservation is present.
154 *
155 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
156 * RELEASE(6) command, or RELEASE(10) command shall be processed
157 * as defined in SPC-2.
158 */
159 if (pr_reg->pr_res_holder) {
160 core_scsi3_put_pr_reg(pr_reg);
161 *ret = 0;
162 return false;
163 }
164 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
165 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
166 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
168 core_scsi3_put_pr_reg(pr_reg);
169 *ret = 0;
170 return true;
171 }
172 core_scsi3_put_pr_reg(pr_reg);
173 conflict = 1;
174 } else {
175 /*
176 * Following spc2r20 5.5.1 Reservations overview:
177 *
178 * If a logical unit has executed a PERSISTENT RESERVE OUT
179 * command with the REGISTER or the REGISTER AND IGNORE
180 * EXISTING KEY service action and is still registered by any
181 * initiator, all RESERVE commands and all RELEASE commands
182 * regardless of initiator shall conflict and shall terminate
183 * with a RESERVATION CONFLICT status.
184 */
185 spin_lock(&pr_tmpl->registration_lock);
186 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
187 spin_unlock(&pr_tmpl->registration_lock);
188 }
189
190 if (conflict) {
191 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
192 " while active SPC-3 registrations exist,"
193 " returning RESERVATION_CONFLICT\n");
194 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
195 return true;
196 }
197
198 return false;
199 }
200
201 int target_scsi2_reservation_release(struct se_task *task)
202 {
203 struct se_cmd *cmd = task->task_se_cmd;
204 struct se_device *dev = cmd->se_dev;
205 struct se_session *sess = cmd->se_sess;
206 struct se_portal_group *tpg = sess->se_tpg;
207 int ret = 0;
208
209 if (!sess || !tpg)
210 goto out;
211 if (target_check_scsi2_reservation_conflict(cmd, &ret))
212 goto out;
213
214 ret = 0;
215 spin_lock(&dev->dev_reservation_lock);
216 if (!dev->dev_reserved_node_acl || !sess)
217 goto out_unlock;
218
219 if (dev->dev_reserved_node_acl != sess->se_node_acl)
220 goto out_unlock;
221
222 dev->dev_reserved_node_acl = NULL;
223 dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
224 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
225 dev->dev_res_bin_isid = 0;
226 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
227 }
228 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
229 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
230 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
231 sess->se_node_acl->initiatorname);
232
233 out_unlock:
234 spin_unlock(&dev->dev_reservation_lock);
235 out:
236 if (!ret) {
237 task->task_scsi_status = GOOD;
238 transport_complete_task(task, 1);
239 }
240 return ret;
241 }
242
243 int target_scsi2_reservation_reserve(struct se_task *task)
244 {
245 struct se_cmd *cmd = task->task_se_cmd;
246 struct se_device *dev = cmd->se_dev;
247 struct se_session *sess = cmd->se_sess;
248 struct se_portal_group *tpg = sess->se_tpg;
249 int ret = 0;
250
251 if ((cmd->t_task_cdb[1] & 0x01) &&
252 (cmd->t_task_cdb[1] & 0x02)) {
253 pr_err("LongIO and Obselete Bits set, returning"
254 " ILLEGAL_REQUEST\n");
255 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
256 ret = -EINVAL;
257 goto out;
258 }
259 /*
260 * This is currently the case for target_core_mod passthrough struct se_cmd
261 * ops
262 */
263 if (!sess || !tpg)
264 goto out;
265 if (target_check_scsi2_reservation_conflict(cmd, &ret))
266 goto out;
267
268 ret = 0;
269 spin_lock(&dev->dev_reservation_lock);
270 if (dev->dev_reserved_node_acl &&
271 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
272 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
273 tpg->se_tpg_tfo->get_fabric_name());
274 pr_err("Original reserver LUN: %u %s\n",
275 cmd->se_lun->unpacked_lun,
276 dev->dev_reserved_node_acl->initiatorname);
277 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
278 " from %s \n", cmd->se_lun->unpacked_lun,
279 cmd->se_deve->mapped_lun,
280 sess->se_node_acl->initiatorname);
281 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
282 ret = -EINVAL;
283 goto out_unlock;
284 }
285
286 dev->dev_reserved_node_acl = sess->se_node_acl;
287 dev->dev_flags |= DF_SPC2_RESERVATIONS;
288 if (sess->sess_bin_isid != 0) {
289 dev->dev_res_bin_isid = sess->sess_bin_isid;
290 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
291 }
292 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
293 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
294 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
295 sess->se_node_acl->initiatorname);
296
297 out_unlock:
298 spin_unlock(&dev->dev_reservation_lock);
299 out:
300 if (!ret) {
301 task->task_scsi_status = GOOD;
302 transport_complete_task(task, 1);
303 }
304 return ret;
305 }
306
307
308 /*
309 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
310 *
311 * This function is called by those initiator ports who are *NOT*
312 * the active PR reservation holder when a reservation is present.
313 */
314 static int core_scsi3_pr_seq_non_holder(
315 struct se_cmd *cmd,
316 unsigned char *cdb,
317 u32 pr_reg_type)
318 {
319 struct se_dev_entry *se_deve;
320 struct se_session *se_sess = cmd->se_sess;
321 int other_cdb = 0, ignore_reg;
322 int registered_nexus = 0, ret = 1; /* Conflict by default */
323 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
324 int we = 0; /* Write Exclusive */
325 int legacy = 0; /* Act like a legacy device and return
326 * RESERVATION CONFLICT on some CDBs */
327 /*
328 * A legacy SPC-2 reservation is being held.
329 */
330 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
331 return core_scsi2_reservation_seq_non_holder(cmd,
332 cdb, pr_reg_type);
333
334 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
335 /*
336 * Determine if the registration should be ignored due to
337 * non-matching ISIDs in core_scsi3_pr_reservation_check().
338 */
339 ignore_reg = (pr_reg_type & 0x80000000);
340 if (ignore_reg)
341 pr_reg_type &= ~0x80000000;
342
343 switch (pr_reg_type) {
344 case PR_TYPE_WRITE_EXCLUSIVE:
345 we = 1;
346 case PR_TYPE_EXCLUSIVE_ACCESS:
347 /*
348 * Some commands are only allowed for the persistent reservation
349 * holder.
350 */
351 if ((se_deve->def_pr_registered) && !(ignore_reg))
352 registered_nexus = 1;
353 break;
354 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
355 we = 1;
356 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
357 /*
358 * Some commands are only allowed for registered I_T Nexuses.
359 */
360 reg_only = 1;
361 if ((se_deve->def_pr_registered) && !(ignore_reg))
362 registered_nexus = 1;
363 break;
364 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
365 we = 1;
366 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
367 /*
368 * Each registered I_T Nexus is a reservation holder.
369 */
370 all_reg = 1;
371 if ((se_deve->def_pr_registered) && !(ignore_reg))
372 registered_nexus = 1;
373 break;
374 default:
375 return -EINVAL;
376 }
377 /*
378 * Referenced from spc4r17 table 45 for *NON* PR holder access
379 */
380 switch (cdb[0]) {
381 case SECURITY_PROTOCOL_IN:
382 if (registered_nexus)
383 return 0;
384 ret = (we) ? 0 : 1;
385 break;
386 case MODE_SENSE:
387 case MODE_SENSE_10:
388 case READ_ATTRIBUTE:
389 case READ_BUFFER:
390 case RECEIVE_DIAGNOSTIC:
391 if (legacy) {
392 ret = 1;
393 break;
394 }
395 if (registered_nexus) {
396 ret = 0;
397 break;
398 }
399 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
400 break;
401 case PERSISTENT_RESERVE_OUT:
402 /*
403 * This follows PERSISTENT_RESERVE_OUT service actions that
404 * are allowed in the presence of various reservations.
405 * See spc4r17, table 46
406 */
407 switch (cdb[1] & 0x1f) {
408 case PRO_CLEAR:
409 case PRO_PREEMPT:
410 case PRO_PREEMPT_AND_ABORT:
411 ret = (registered_nexus) ? 0 : 1;
412 break;
413 case PRO_REGISTER:
414 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
415 ret = 0;
416 break;
417 case PRO_REGISTER_AND_MOVE:
418 case PRO_RESERVE:
419 ret = 1;
420 break;
421 case PRO_RELEASE:
422 ret = (registered_nexus) ? 0 : 1;
423 break;
424 default:
425 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
426 " action: 0x%02x\n", cdb[1] & 0x1f);
427 return -EINVAL;
428 }
429 break;
430 case RELEASE:
431 case RELEASE_10:
432 /* Handled by CRH=1 in target_scsi2_reservation_release() */
433 ret = 0;
434 break;
435 case RESERVE:
436 case RESERVE_10:
437 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
438 ret = 0;
439 break;
440 case TEST_UNIT_READY:
441 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
442 break;
443 case MAINTENANCE_IN:
444 switch (cdb[1] & 0x1f) {
445 case MI_MANAGEMENT_PROTOCOL_IN:
446 if (registered_nexus) {
447 ret = 0;
448 break;
449 }
450 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
451 break;
452 case MI_REPORT_SUPPORTED_OPERATION_CODES:
453 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
454 if (legacy) {
455 ret = 1;
456 break;
457 }
458 if (registered_nexus) {
459 ret = 0;
460 break;
461 }
462 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
463 break;
464 case MI_REPORT_ALIASES:
465 case MI_REPORT_IDENTIFYING_INFORMATION:
466 case MI_REPORT_PRIORITY:
467 case MI_REPORT_TARGET_PGS:
468 case MI_REPORT_TIMESTAMP:
469 ret = 0; /* Allowed */
470 break;
471 default:
472 pr_err("Unknown MI Service Action: 0x%02x\n",
473 (cdb[1] & 0x1f));
474 return -EINVAL;
475 }
476 break;
477 case ACCESS_CONTROL_IN:
478 case ACCESS_CONTROL_OUT:
479 case INQUIRY:
480 case LOG_SENSE:
481 case READ_MEDIA_SERIAL_NUMBER:
482 case REPORT_LUNS:
483 case REQUEST_SENSE:
484 ret = 0; /*/ Allowed CDBs */
485 break;
486 default:
487 other_cdb = 1;
488 break;
489 }
490 /*
491 * Case where the CDB is explicitly allowed in the above switch
492 * statement.
493 */
494 if (!ret && !other_cdb) {
495 #if 0
496 pr_debug("Allowing explict CDB: 0x%02x for %s"
497 " reservation holder\n", cdb[0],
498 core_scsi3_pr_dump_type(pr_reg_type));
499 #endif
500 return ret;
501 }
502 /*
503 * Check if write exclusive initiator ports *NOT* holding the
504 * WRITE_EXCLUSIVE_* reservation.
505 */
506 if ((we) && !(registered_nexus)) {
507 if (cmd->data_direction == DMA_TO_DEVICE) {
508 /*
509 * Conflict for write exclusive
510 */
511 pr_debug("%s Conflict for unregistered nexus"
512 " %s CDB: 0x%02x to %s reservation\n",
513 transport_dump_cmd_direction(cmd),
514 se_sess->se_node_acl->initiatorname, cdb[0],
515 core_scsi3_pr_dump_type(pr_reg_type));
516 return 1;
517 } else {
518 /*
519 * Allow non WRITE CDBs for all Write Exclusive
520 * PR TYPEs to pass for registered and
521 * non-registered_nexuxes NOT holding the reservation.
522 *
523 * We only make noise for the unregisterd nexuses,
524 * as we expect registered non-reservation holding
525 * nexuses to issue CDBs.
526 */
527 #if 0
528 if (!registered_nexus) {
529 pr_debug("Allowing implict CDB: 0x%02x"
530 " for %s reservation on unregistered"
531 " nexus\n", cdb[0],
532 core_scsi3_pr_dump_type(pr_reg_type));
533 }
534 #endif
535 return 0;
536 }
537 } else if ((reg_only) || (all_reg)) {
538 if (registered_nexus) {
539 /*
540 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
541 * allow commands from registered nexuses.
542 */
543 #if 0
544 pr_debug("Allowing implict CDB: 0x%02x for %s"
545 " reservation\n", cdb[0],
546 core_scsi3_pr_dump_type(pr_reg_type));
547 #endif
548 return 0;
549 }
550 }
551 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
552 " for %s reservation\n", transport_dump_cmd_direction(cmd),
553 (registered_nexus) ? "" : "un",
554 se_sess->se_node_acl->initiatorname, cdb[0],
555 core_scsi3_pr_dump_type(pr_reg_type));
556
557 return 1; /* Conflict by default */
558 }
559
560 static u32 core_scsi3_pr_generation(struct se_device *dev)
561 {
562 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
563 u32 prg;
564 /*
565 * PRGeneration field shall contain the value of a 32-bit wrapping
566 * counter mainted by the device server.
567 *
568 * Note that this is done regardless of Active Persist across
569 * Target PowerLoss (APTPL)
570 *
571 * See spc4r17 section 6.3.12 READ_KEYS service action
572 */
573 spin_lock(&dev->dev_reservation_lock);
574 prg = su_dev->t10_pr.pr_generation++;
575 spin_unlock(&dev->dev_reservation_lock);
576
577 return prg;
578 }
579
580 static int core_scsi3_pr_reservation_check(
581 struct se_cmd *cmd,
582 u32 *pr_reg_type)
583 {
584 struct se_device *dev = cmd->se_dev;
585 struct se_session *sess = cmd->se_sess;
586 int ret;
587
588 if (!sess)
589 return 0;
590 /*
591 * A legacy SPC-2 reservation is being held.
592 */
593 if (dev->dev_flags & DF_SPC2_RESERVATIONS)
594 return core_scsi2_reservation_check(cmd, pr_reg_type);
595
596 spin_lock(&dev->dev_reservation_lock);
597 if (!dev->dev_pr_res_holder) {
598 spin_unlock(&dev->dev_reservation_lock);
599 return 0;
600 }
601 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
602 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
603 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
604 spin_unlock(&dev->dev_reservation_lock);
605 return -EINVAL;
606 }
607 if (!dev->dev_pr_res_holder->isid_present_at_reg) {
608 spin_unlock(&dev->dev_reservation_lock);
609 return 0;
610 }
611 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
612 sess->sess_bin_isid) ? 0 : -EINVAL;
613 /*
614 * Use bit in *pr_reg_type to notify ISID mismatch in
615 * core_scsi3_pr_seq_non_holder().
616 */
617 if (ret != 0)
618 *pr_reg_type |= 0x80000000;
619 spin_unlock(&dev->dev_reservation_lock);
620
621 return ret;
622 }
623
624 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
625 struct se_device *dev,
626 struct se_node_acl *nacl,
627 struct se_dev_entry *deve,
628 unsigned char *isid,
629 u64 sa_res_key,
630 int all_tg_pt,
631 int aptpl)
632 {
633 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
634 struct t10_pr_registration *pr_reg;
635
636 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
637 if (!pr_reg) {
638 pr_err("Unable to allocate struct t10_pr_registration\n");
639 return NULL;
640 }
641
642 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
643 GFP_ATOMIC);
644 if (!pr_reg->pr_aptpl_buf) {
645 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
646 kmem_cache_free(t10_pr_reg_cache, pr_reg);
647 return NULL;
648 }
649
650 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
651 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
652 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
653 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
654 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
655 atomic_set(&pr_reg->pr_res_holders, 0);
656 pr_reg->pr_reg_nacl = nacl;
657 pr_reg->pr_reg_deve = deve;
658 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
659 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
660 pr_reg->pr_res_key = sa_res_key;
661 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
662 pr_reg->pr_reg_aptpl = aptpl;
663 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
664 /*
665 * If an ISID value for this SCSI Initiator Port exists,
666 * save it to the registration now.
667 */
668 if (isid != NULL) {
669 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
670 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
671 pr_reg->isid_present_at_reg = 1;
672 }
673
674 return pr_reg;
675 }
676
677 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
678 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
679
680 /*
681 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
682 * modes.
683 */
684 static struct t10_pr_registration *__core_scsi3_alloc_registration(
685 struct se_device *dev,
686 struct se_node_acl *nacl,
687 struct se_dev_entry *deve,
688 unsigned char *isid,
689 u64 sa_res_key,
690 int all_tg_pt,
691 int aptpl)
692 {
693 struct se_dev_entry *deve_tmp;
694 struct se_node_acl *nacl_tmp;
695 struct se_port *port, *port_tmp;
696 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
697 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
698 int ret;
699 /*
700 * Create a registration for the I_T Nexus upon which the
701 * PROUT REGISTER was received.
702 */
703 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
704 sa_res_key, all_tg_pt, aptpl);
705 if (!pr_reg)
706 return NULL;
707 /*
708 * Return pointer to pr_reg for ALL_TG_PT=0
709 */
710 if (!all_tg_pt)
711 return pr_reg;
712 /*
713 * Create list of matching SCSI Initiator Port registrations
714 * for ALL_TG_PT=1
715 */
716 spin_lock(&dev->se_port_lock);
717 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
718 atomic_inc(&port->sep_tg_pt_ref_cnt);
719 smp_mb__after_atomic_inc();
720 spin_unlock(&dev->se_port_lock);
721
722 spin_lock_bh(&port->sep_alua_lock);
723 list_for_each_entry(deve_tmp, &port->sep_alua_list,
724 alua_port_list) {
725 /*
726 * This pointer will be NULL for demo mode MappedLUNs
727 * that have not been make explict via a ConfigFS
728 * MappedLUN group for the SCSI Initiator Node ACL.
729 */
730 if (!deve_tmp->se_lun_acl)
731 continue;
732
733 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
734 /*
735 * Skip the matching struct se_node_acl that is allocated
736 * above..
737 */
738 if (nacl == nacl_tmp)
739 continue;
740 /*
741 * Only perform PR registrations for target ports on
742 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
743 * arrived.
744 */
745 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
746 continue;
747 /*
748 * Look for a matching Initiator Node ACL in ASCII format
749 */
750 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
751 continue;
752
753 atomic_inc(&deve_tmp->pr_ref_count);
754 smp_mb__after_atomic_inc();
755 spin_unlock_bh(&port->sep_alua_lock);
756 /*
757 * Grab a configfs group dependency that is released
758 * for the exception path at label out: below, or upon
759 * completion of adding ALL_TG_PT=1 registrations in
760 * __core_scsi3_add_registration()
761 */
762 ret = core_scsi3_lunacl_depend_item(deve_tmp);
763 if (ret < 0) {
764 pr_err("core_scsi3_lunacl_depend"
765 "_item() failed\n");
766 atomic_dec(&port->sep_tg_pt_ref_cnt);
767 smp_mb__after_atomic_dec();
768 atomic_dec(&deve_tmp->pr_ref_count);
769 smp_mb__after_atomic_dec();
770 goto out;
771 }
772 /*
773 * Located a matching SCSI Initiator Port on a different
774 * port, allocate the pr_reg_atp and attach it to the
775 * pr_reg->pr_reg_atp_list that will be processed once
776 * the original *pr_reg is processed in
777 * __core_scsi3_add_registration()
778 */
779 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
780 nacl_tmp, deve_tmp, NULL,
781 sa_res_key, all_tg_pt, aptpl);
782 if (!pr_reg_atp) {
783 atomic_dec(&port->sep_tg_pt_ref_cnt);
784 smp_mb__after_atomic_dec();
785 atomic_dec(&deve_tmp->pr_ref_count);
786 smp_mb__after_atomic_dec();
787 core_scsi3_lunacl_undepend_item(deve_tmp);
788 goto out;
789 }
790
791 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
792 &pr_reg->pr_reg_atp_list);
793 spin_lock_bh(&port->sep_alua_lock);
794 }
795 spin_unlock_bh(&port->sep_alua_lock);
796
797 spin_lock(&dev->se_port_lock);
798 atomic_dec(&port->sep_tg_pt_ref_cnt);
799 smp_mb__after_atomic_dec();
800 }
801 spin_unlock(&dev->se_port_lock);
802
803 return pr_reg;
804 out:
805 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
806 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
807 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
808 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
809 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
810 }
811 kmem_cache_free(t10_pr_reg_cache, pr_reg);
812 return NULL;
813 }
814
815 int core_scsi3_alloc_aptpl_registration(
816 struct t10_reservation *pr_tmpl,
817 u64 sa_res_key,
818 unsigned char *i_port,
819 unsigned char *isid,
820 u32 mapped_lun,
821 unsigned char *t_port,
822 u16 tpgt,
823 u32 target_lun,
824 int res_holder,
825 int all_tg_pt,
826 u8 type)
827 {
828 struct t10_pr_registration *pr_reg;
829
830 if (!i_port || !t_port || !sa_res_key) {
831 pr_err("Illegal parameters for APTPL registration\n");
832 return -EINVAL;
833 }
834
835 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
836 if (!pr_reg) {
837 pr_err("Unable to allocate struct t10_pr_registration\n");
838 return -ENOMEM;
839 }
840 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
841
842 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
843 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
844 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
845 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
846 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
847 atomic_set(&pr_reg->pr_res_holders, 0);
848 pr_reg->pr_reg_nacl = NULL;
849 pr_reg->pr_reg_deve = NULL;
850 pr_reg->pr_res_mapped_lun = mapped_lun;
851 pr_reg->pr_aptpl_target_lun = target_lun;
852 pr_reg->pr_res_key = sa_res_key;
853 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
854 pr_reg->pr_reg_aptpl = 1;
855 pr_reg->pr_reg_tg_pt_lun = NULL;
856 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
857 pr_reg->pr_res_type = type;
858 /*
859 * If an ISID value had been saved in APTPL metadata for this
860 * SCSI Initiator Port, restore it now.
861 */
862 if (isid != NULL) {
863 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
864 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
865 pr_reg->isid_present_at_reg = 1;
866 }
867 /*
868 * Copy the i_port and t_port information from caller.
869 */
870 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
871 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
872 pr_reg->pr_reg_tpgt = tpgt;
873 /*
874 * Set pr_res_holder from caller, the pr_reg who is the reservation
875 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
876 * the Initiator Node LUN ACL from the fabric module is created for
877 * this registration.
878 */
879 pr_reg->pr_res_holder = res_holder;
880
881 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
882 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
883 " metadata\n", (res_holder) ? "+reservation" : "");
884 return 0;
885 }
886
887 static void core_scsi3_aptpl_reserve(
888 struct se_device *dev,
889 struct se_portal_group *tpg,
890 struct se_node_acl *node_acl,
891 struct t10_pr_registration *pr_reg)
892 {
893 char i_buf[PR_REG_ISID_ID_LEN];
894 int prf_isid;
895
896 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
897 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
898 PR_REG_ISID_ID_LEN);
899
900 spin_lock(&dev->dev_reservation_lock);
901 dev->dev_pr_res_holder = pr_reg;
902 spin_unlock(&dev->dev_reservation_lock);
903
904 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
905 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
906 tpg->se_tpg_tfo->get_fabric_name(),
907 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
908 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
909 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
910 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
911 (prf_isid) ? &i_buf[0] : "");
912 }
913
914 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
915 struct t10_pr_registration *, int, int);
916
917 static int __core_scsi3_check_aptpl_registration(
918 struct se_device *dev,
919 struct se_portal_group *tpg,
920 struct se_lun *lun,
921 u32 target_lun,
922 struct se_node_acl *nacl,
923 struct se_dev_entry *deve)
924 {
925 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
926 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
927 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
928 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
929 u16 tpgt;
930
931 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
932 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
933 /*
934 * Copy Initiator Port information from struct se_node_acl
935 */
936 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
937 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
938 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
939 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
940 /*
941 * Look for the matching registrations+reservation from those
942 * created from APTPL metadata. Note that multiple registrations
943 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
944 * TransportIDs.
945 */
946 spin_lock(&pr_tmpl->aptpl_reg_lock);
947 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
948 pr_reg_aptpl_list) {
949 if (!strcmp(pr_reg->pr_iport, i_port) &&
950 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
951 !(strcmp(pr_reg->pr_tport, t_port)) &&
952 (pr_reg->pr_reg_tpgt == tpgt) &&
953 (pr_reg->pr_aptpl_target_lun == target_lun)) {
954
955 pr_reg->pr_reg_nacl = nacl;
956 pr_reg->pr_reg_deve = deve;
957 pr_reg->pr_reg_tg_pt_lun = lun;
958
959 list_del(&pr_reg->pr_reg_aptpl_list);
960 spin_unlock(&pr_tmpl->aptpl_reg_lock);
961 /*
962 * At this point all of the pointers in *pr_reg will
963 * be setup, so go ahead and add the registration.
964 */
965
966 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
967 /*
968 * If this registration is the reservation holder,
969 * make that happen now..
970 */
971 if (pr_reg->pr_res_holder)
972 core_scsi3_aptpl_reserve(dev, tpg,
973 nacl, pr_reg);
974 /*
975 * Reenable pr_aptpl_active to accept new metadata
976 * updates once the SCSI device is active again..
977 */
978 spin_lock(&pr_tmpl->aptpl_reg_lock);
979 pr_tmpl->pr_aptpl_active = 1;
980 }
981 }
982 spin_unlock(&pr_tmpl->aptpl_reg_lock);
983
984 return 0;
985 }
986
987 int core_scsi3_check_aptpl_registration(
988 struct se_device *dev,
989 struct se_portal_group *tpg,
990 struct se_lun *lun,
991 struct se_lun_acl *lun_acl)
992 {
993 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
994 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
995 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
996
997 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
998 return 0;
999
1000 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1001 lun->unpacked_lun, nacl, deve);
1002 }
1003
1004 static void __core_scsi3_dump_registration(
1005 struct target_core_fabric_ops *tfo,
1006 struct se_device *dev,
1007 struct se_node_acl *nacl,
1008 struct t10_pr_registration *pr_reg,
1009 int register_type)
1010 {
1011 struct se_portal_group *se_tpg = nacl->se_tpg;
1012 char i_buf[PR_REG_ISID_ID_LEN];
1013 int prf_isid;
1014
1015 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1016 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1017 PR_REG_ISID_ID_LEN);
1018
1019 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1020 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1021 "_AND_MOVE" : (register_type == 1) ?
1022 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1023 (prf_isid) ? i_buf : "");
1024 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1025 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1026 tfo->tpg_get_tag(se_tpg));
1027 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1028 " Port(s)\n", tfo->get_fabric_name(),
1029 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1030 dev->transport->name);
1031 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1032 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1033 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1034 pr_reg->pr_reg_aptpl);
1035 }
1036
1037 /*
1038 * this function can be called with struct se_device->dev_reservation_lock
1039 * when register_move = 1
1040 */
1041 static void __core_scsi3_add_registration(
1042 struct se_device *dev,
1043 struct se_node_acl *nacl,
1044 struct t10_pr_registration *pr_reg,
1045 int register_type,
1046 int register_move)
1047 {
1048 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1049 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1050 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1051 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1052
1053 /*
1054 * Increment PRgeneration counter for struct se_device upon a successful
1055 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1056 *
1057 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1058 * action, the struct se_device->dev_reservation_lock will already be held,
1059 * so we do not call core_scsi3_pr_generation() which grabs the lock
1060 * for the REGISTER.
1061 */
1062 pr_reg->pr_res_generation = (register_move) ?
1063 su_dev->t10_pr.pr_generation++ :
1064 core_scsi3_pr_generation(dev);
1065
1066 spin_lock(&pr_tmpl->registration_lock);
1067 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1068 pr_reg->pr_reg_deve->def_pr_registered = 1;
1069
1070 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1071 spin_unlock(&pr_tmpl->registration_lock);
1072 /*
1073 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1074 */
1075 if (!pr_reg->pr_reg_all_tg_pt || register_move)
1076 return;
1077 /*
1078 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1079 * allocated in __core_scsi3_alloc_registration()
1080 */
1081 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1082 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1083 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1084
1085 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1086
1087 spin_lock(&pr_tmpl->registration_lock);
1088 list_add_tail(&pr_reg_tmp->pr_reg_list,
1089 &pr_tmpl->registration_list);
1090 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1091
1092 __core_scsi3_dump_registration(tfo, dev,
1093 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1094 register_type);
1095 spin_unlock(&pr_tmpl->registration_lock);
1096 /*
1097 * Drop configfs group dependency reference from
1098 * __core_scsi3_alloc_registration()
1099 */
1100 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1101 }
1102 }
1103
1104 static int core_scsi3_alloc_registration(
1105 struct se_device *dev,
1106 struct se_node_acl *nacl,
1107 struct se_dev_entry *deve,
1108 unsigned char *isid,
1109 u64 sa_res_key,
1110 int all_tg_pt,
1111 int aptpl,
1112 int register_type,
1113 int register_move)
1114 {
1115 struct t10_pr_registration *pr_reg;
1116
1117 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1118 sa_res_key, all_tg_pt, aptpl);
1119 if (!pr_reg)
1120 return -EPERM;
1121
1122 __core_scsi3_add_registration(dev, nacl, pr_reg,
1123 register_type, register_move);
1124 return 0;
1125 }
1126
1127 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1128 struct se_device *dev,
1129 struct se_node_acl *nacl,
1130 unsigned char *isid)
1131 {
1132 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1133 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1134 struct se_portal_group *tpg;
1135
1136 spin_lock(&pr_tmpl->registration_lock);
1137 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1138 &pr_tmpl->registration_list, pr_reg_list) {
1139 /*
1140 * First look for a matching struct se_node_acl
1141 */
1142 if (pr_reg->pr_reg_nacl != nacl)
1143 continue;
1144
1145 tpg = pr_reg->pr_reg_nacl->se_tpg;
1146 /*
1147 * If this registration does NOT contain a fabric provided
1148 * ISID, then we have found a match.
1149 */
1150 if (!pr_reg->isid_present_at_reg) {
1151 /*
1152 * Determine if this SCSI device server requires that
1153 * SCSI Intiatior TransportID w/ ISIDs is enforced
1154 * for fabric modules (iSCSI) requiring them.
1155 */
1156 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1157 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1158 continue;
1159 }
1160 atomic_inc(&pr_reg->pr_res_holders);
1161 smp_mb__after_atomic_inc();
1162 spin_unlock(&pr_tmpl->registration_lock);
1163 return pr_reg;
1164 }
1165 /*
1166 * If the *pr_reg contains a fabric defined ISID for multi-value
1167 * SCSI Initiator Port TransportIDs, then we expect a valid
1168 * matching ISID to be provided by the local SCSI Initiator Port.
1169 */
1170 if (!isid)
1171 continue;
1172 if (strcmp(isid, pr_reg->pr_reg_isid))
1173 continue;
1174
1175 atomic_inc(&pr_reg->pr_res_holders);
1176 smp_mb__after_atomic_inc();
1177 spin_unlock(&pr_tmpl->registration_lock);
1178 return pr_reg;
1179 }
1180 spin_unlock(&pr_tmpl->registration_lock);
1181
1182 return NULL;
1183 }
1184
1185 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1186 struct se_device *dev,
1187 struct se_node_acl *nacl,
1188 struct se_session *sess)
1189 {
1190 struct se_portal_group *tpg = nacl->se_tpg;
1191 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1192
1193 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1194 memset(&buf[0], 0, PR_REG_ISID_LEN);
1195 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1196 PR_REG_ISID_LEN);
1197 isid_ptr = &buf[0];
1198 }
1199
1200 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1201 }
1202
1203 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1204 {
1205 atomic_dec(&pr_reg->pr_res_holders);
1206 smp_mb__after_atomic_dec();
1207 }
1208
1209 static int core_scsi3_check_implict_release(
1210 struct se_device *dev,
1211 struct t10_pr_registration *pr_reg)
1212 {
1213 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1214 struct t10_pr_registration *pr_res_holder;
1215 int ret = 0;
1216
1217 spin_lock(&dev->dev_reservation_lock);
1218 pr_res_holder = dev->dev_pr_res_holder;
1219 if (!pr_res_holder) {
1220 spin_unlock(&dev->dev_reservation_lock);
1221 return ret;
1222 }
1223 if (pr_res_holder == pr_reg) {
1224 /*
1225 * Perform an implict RELEASE if the registration that
1226 * is being released is holding the reservation.
1227 *
1228 * From spc4r17, section 5.7.11.1:
1229 *
1230 * e) If the I_T nexus is the persistent reservation holder
1231 * and the persistent reservation is not an all registrants
1232 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1233 * service action or REGISTER AND IGNORE EXISTING KEY
1234 * service action with the SERVICE ACTION RESERVATION KEY
1235 * field set to zero (see 5.7.11.3).
1236 */
1237 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1238 ret = 1;
1239 /*
1240 * For 'All Registrants' reservation types, all existing
1241 * registrations are still processed as reservation holders
1242 * in core_scsi3_pr_seq_non_holder() after the initial
1243 * reservation holder is implictly released here.
1244 */
1245 } else if (pr_reg->pr_reg_all_tg_pt &&
1246 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1247 pr_reg->pr_reg_nacl->initiatorname)) &&
1248 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1249 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1250 " UNREGISTER while existing reservation with matching"
1251 " key 0x%016Lx is present from another SCSI Initiator"
1252 " Port\n", pr_reg->pr_res_key);
1253 ret = -EPERM;
1254 }
1255 spin_unlock(&dev->dev_reservation_lock);
1256
1257 return ret;
1258 }
1259
1260 /*
1261 * Called with struct t10_reservation->registration_lock held.
1262 */
1263 static void __core_scsi3_free_registration(
1264 struct se_device *dev,
1265 struct t10_pr_registration *pr_reg,
1266 struct list_head *preempt_and_abort_list,
1267 int dec_holders)
1268 {
1269 struct target_core_fabric_ops *tfo =
1270 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1271 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1272 char i_buf[PR_REG_ISID_ID_LEN];
1273 int prf_isid;
1274
1275 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1276 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1277 PR_REG_ISID_ID_LEN);
1278
1279 pr_reg->pr_reg_deve->def_pr_registered = 0;
1280 pr_reg->pr_reg_deve->pr_res_key = 0;
1281 list_del(&pr_reg->pr_reg_list);
1282 /*
1283 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1284 * so call core_scsi3_put_pr_reg() to decrement our reference.
1285 */
1286 if (dec_holders)
1287 core_scsi3_put_pr_reg(pr_reg);
1288 /*
1289 * Wait until all reference from any other I_T nexuses for this
1290 * *pr_reg have been released. Because list_del() is called above,
1291 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1292 * count back to zero, and we release *pr_reg.
1293 */
1294 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1295 spin_unlock(&pr_tmpl->registration_lock);
1296 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1297 tfo->get_fabric_name());
1298 cpu_relax();
1299 spin_lock(&pr_tmpl->registration_lock);
1300 }
1301
1302 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1303 " Node: %s%s\n", tfo->get_fabric_name(),
1304 pr_reg->pr_reg_nacl->initiatorname,
1305 (prf_isid) ? &i_buf[0] : "");
1306 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1307 " Port(s)\n", tfo->get_fabric_name(),
1308 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1309 dev->transport->name);
1310 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1311 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1312 pr_reg->pr_res_generation);
1313
1314 if (!preempt_and_abort_list) {
1315 pr_reg->pr_reg_deve = NULL;
1316 pr_reg->pr_reg_nacl = NULL;
1317 kfree(pr_reg->pr_aptpl_buf);
1318 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1319 return;
1320 }
1321 /*
1322 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1323 * are released once the ABORT_TASK_SET has completed..
1324 */
1325 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1326 }
1327
1328 void core_scsi3_free_pr_reg_from_nacl(
1329 struct se_device *dev,
1330 struct se_node_acl *nacl)
1331 {
1332 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1333 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1334 /*
1335 * If the passed se_node_acl matches the reservation holder,
1336 * release the reservation.
1337 */
1338 spin_lock(&dev->dev_reservation_lock);
1339 pr_res_holder = dev->dev_pr_res_holder;
1340 if ((pr_res_holder != NULL) &&
1341 (pr_res_holder->pr_reg_nacl == nacl))
1342 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1343 spin_unlock(&dev->dev_reservation_lock);
1344 /*
1345 * Release any registration associated with the struct se_node_acl.
1346 */
1347 spin_lock(&pr_tmpl->registration_lock);
1348 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1349 &pr_tmpl->registration_list, pr_reg_list) {
1350
1351 if (pr_reg->pr_reg_nacl != nacl)
1352 continue;
1353
1354 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1355 }
1356 spin_unlock(&pr_tmpl->registration_lock);
1357 }
1358
1359 void core_scsi3_free_all_registrations(
1360 struct se_device *dev)
1361 {
1362 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1363 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1364
1365 spin_lock(&dev->dev_reservation_lock);
1366 pr_res_holder = dev->dev_pr_res_holder;
1367 if (pr_res_holder != NULL) {
1368 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1369 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1370 pr_res_holder, 0);
1371 }
1372 spin_unlock(&dev->dev_reservation_lock);
1373
1374 spin_lock(&pr_tmpl->registration_lock);
1375 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1376 &pr_tmpl->registration_list, pr_reg_list) {
1377
1378 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1379 }
1380 spin_unlock(&pr_tmpl->registration_lock);
1381
1382 spin_lock(&pr_tmpl->aptpl_reg_lock);
1383 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1384 pr_reg_aptpl_list) {
1385 list_del(&pr_reg->pr_reg_aptpl_list);
1386 kfree(pr_reg->pr_aptpl_buf);
1387 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1388 }
1389 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1390 }
1391
1392 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1393 {
1394 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1395 &tpg->tpg_group.cg_item);
1396 }
1397
1398 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1399 {
1400 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1401 &tpg->tpg_group.cg_item);
1402
1403 atomic_dec(&tpg->tpg_pr_ref_count);
1404 smp_mb__after_atomic_dec();
1405 }
1406
1407 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1408 {
1409 struct se_portal_group *tpg = nacl->se_tpg;
1410
1411 if (nacl->dynamic_node_acl)
1412 return 0;
1413
1414 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1415 &nacl->acl_group.cg_item);
1416 }
1417
1418 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1419 {
1420 struct se_portal_group *tpg = nacl->se_tpg;
1421
1422 if (nacl->dynamic_node_acl) {
1423 atomic_dec(&nacl->acl_pr_ref_count);
1424 smp_mb__after_atomic_dec();
1425 return;
1426 }
1427
1428 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1429 &nacl->acl_group.cg_item);
1430
1431 atomic_dec(&nacl->acl_pr_ref_count);
1432 smp_mb__after_atomic_dec();
1433 }
1434
1435 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1436 {
1437 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1438 struct se_node_acl *nacl;
1439 struct se_portal_group *tpg;
1440 /*
1441 * For nacl->dynamic_node_acl=1
1442 */
1443 if (!lun_acl)
1444 return 0;
1445
1446 nacl = lun_acl->se_lun_nacl;
1447 tpg = nacl->se_tpg;
1448
1449 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1450 &lun_acl->se_lun_group.cg_item);
1451 }
1452
1453 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1454 {
1455 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1456 struct se_node_acl *nacl;
1457 struct se_portal_group *tpg;
1458 /*
1459 * For nacl->dynamic_node_acl=1
1460 */
1461 if (!lun_acl) {
1462 atomic_dec(&se_deve->pr_ref_count);
1463 smp_mb__after_atomic_dec();
1464 return;
1465 }
1466 nacl = lun_acl->se_lun_nacl;
1467 tpg = nacl->se_tpg;
1468
1469 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1470 &lun_acl->se_lun_group.cg_item);
1471
1472 atomic_dec(&se_deve->pr_ref_count);
1473 smp_mb__after_atomic_dec();
1474 }
1475
1476 static int core_scsi3_decode_spec_i_port(
1477 struct se_cmd *cmd,
1478 struct se_portal_group *tpg,
1479 unsigned char *l_isid,
1480 u64 sa_res_key,
1481 int all_tg_pt,
1482 int aptpl)
1483 {
1484 struct se_device *dev = cmd->se_dev;
1485 struct se_port *tmp_port;
1486 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1487 struct se_session *se_sess = cmd->se_sess;
1488 struct se_node_acl *dest_node_acl = NULL;
1489 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1490 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1491 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1492 struct list_head tid_dest_list;
1493 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1494 struct target_core_fabric_ops *tmp_tf_ops;
1495 unsigned char *buf;
1496 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1497 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1498 u32 tpdl, tid_len = 0;
1499 int ret, dest_local_nexus, prf_isid;
1500 u32 dest_rtpi = 0;
1501
1502 memset(dest_iport, 0, 64);
1503 INIT_LIST_HEAD(&tid_dest_list);
1504
1505 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1506 /*
1507 * Allocate a struct pr_transport_id_holder and setup the
1508 * local_node_acl and local_se_deve pointers and add to
1509 * struct list_head tid_dest_list for add registration
1510 * processing in the loop of tid_dest_list below.
1511 */
1512 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1513 if (!tidh_new) {
1514 pr_err("Unable to allocate tidh_new\n");
1515 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1516 return -EINVAL;
1517 }
1518 INIT_LIST_HEAD(&tidh_new->dest_list);
1519 tidh_new->dest_tpg = tpg;
1520 tidh_new->dest_node_acl = se_sess->se_node_acl;
1521 tidh_new->dest_se_deve = local_se_deve;
1522
1523 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1524 se_sess->se_node_acl, local_se_deve, l_isid,
1525 sa_res_key, all_tg_pt, aptpl);
1526 if (!local_pr_reg) {
1527 kfree(tidh_new);
1528 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1529 return -ENOMEM;
1530 }
1531 tidh_new->dest_pr_reg = local_pr_reg;
1532 /*
1533 * The local I_T nexus does not hold any configfs dependances,
1534 * so we set tid_h->dest_local_nexus=1 to prevent the
1535 * configfs_undepend_item() calls in the tid_dest_list loops below.
1536 */
1537 tidh_new->dest_local_nexus = 1;
1538 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1539
1540 buf = transport_kmap_first_data_page(cmd);
1541 /*
1542 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1543 * first extract TransportID Parameter Data Length, and make sure
1544 * the value matches up to the SCSI expected data transfer length.
1545 */
1546 tpdl = (buf[24] & 0xff) << 24;
1547 tpdl |= (buf[25] & 0xff) << 16;
1548 tpdl |= (buf[26] & 0xff) << 8;
1549 tpdl |= buf[27] & 0xff;
1550
1551 if ((tpdl + 28) != cmd->data_length) {
1552 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1553 " does not equal CDB data_length: %u\n", tpdl,
1554 cmd->data_length);
1555 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1556 ret = -EINVAL;
1557 goto out;
1558 }
1559 /*
1560 * Start processing the received transport IDs using the
1561 * receiving I_T Nexus portal's fabric dependent methods to
1562 * obtain the SCSI Initiator Port/Device Identifiers.
1563 */
1564 ptr = &buf[28];
1565
1566 while (tpdl > 0) {
1567 proto_ident = (ptr[0] & 0x0f);
1568 dest_tpg = NULL;
1569
1570 spin_lock(&dev->se_port_lock);
1571 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1572 tmp_tpg = tmp_port->sep_tpg;
1573 if (!tmp_tpg)
1574 continue;
1575 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1576 if (!tmp_tf_ops)
1577 continue;
1578 if (!tmp_tf_ops->get_fabric_proto_ident ||
1579 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1580 continue;
1581 /*
1582 * Look for the matching proto_ident provided by
1583 * the received TransportID
1584 */
1585 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1586 if (tmp_proto_ident != proto_ident)
1587 continue;
1588 dest_rtpi = tmp_port->sep_rtpi;
1589
1590 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1591 tmp_tpg, (const char *)ptr, &tid_len,
1592 &iport_ptr);
1593 if (!i_str)
1594 continue;
1595
1596 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1597 smp_mb__after_atomic_inc();
1598 spin_unlock(&dev->se_port_lock);
1599
1600 ret = core_scsi3_tpg_depend_item(tmp_tpg);
1601 if (ret != 0) {
1602 pr_err(" core_scsi3_tpg_depend_item()"
1603 " for tmp_tpg\n");
1604 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1605 smp_mb__after_atomic_dec();
1606 cmd->scsi_sense_reason =
1607 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1608 ret = -EINVAL;
1609 goto out;
1610 }
1611 /*
1612 * Locate the desination initiator ACL to be registered
1613 * from the decoded fabric module specific TransportID
1614 * at *i_str.
1615 */
1616 spin_lock_irq(&tmp_tpg->acl_node_lock);
1617 dest_node_acl = __core_tpg_get_initiator_node_acl(
1618 tmp_tpg, i_str);
1619 if (dest_node_acl) {
1620 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1621 smp_mb__after_atomic_inc();
1622 }
1623 spin_unlock_irq(&tmp_tpg->acl_node_lock);
1624
1625 if (!dest_node_acl) {
1626 core_scsi3_tpg_undepend_item(tmp_tpg);
1627 spin_lock(&dev->se_port_lock);
1628 continue;
1629 }
1630
1631 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1632 if (ret != 0) {
1633 pr_err("configfs_depend_item() failed"
1634 " for dest_node_acl->acl_group\n");
1635 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1636 smp_mb__after_atomic_dec();
1637 core_scsi3_tpg_undepend_item(tmp_tpg);
1638 cmd->scsi_sense_reason =
1639 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1640 ret = -EINVAL;
1641 goto out;
1642 }
1643
1644 dest_tpg = tmp_tpg;
1645 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1646 " %s Port RTPI: %hu\n",
1647 dest_tpg->se_tpg_tfo->get_fabric_name(),
1648 dest_node_acl->initiatorname, dest_rtpi);
1649
1650 spin_lock(&dev->se_port_lock);
1651 break;
1652 }
1653 spin_unlock(&dev->se_port_lock);
1654
1655 if (!dest_tpg) {
1656 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1657 " dest_tpg\n");
1658 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1659 ret = -EINVAL;
1660 goto out;
1661 }
1662 #if 0
1663 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1664 " tid_len: %d for %s + %s\n",
1665 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1666 tpdl, tid_len, i_str, iport_ptr);
1667 #endif
1668 if (tid_len > tpdl) {
1669 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1670 " %u for Transport ID: %s\n", tid_len, ptr);
1671 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672 core_scsi3_tpg_undepend_item(dest_tpg);
1673 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1674 ret = -EINVAL;
1675 goto out;
1676 }
1677 /*
1678 * Locate the desintation struct se_dev_entry pointer for matching
1679 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1680 * Target Port.
1681 */
1682 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1683 dest_rtpi);
1684 if (!dest_se_deve) {
1685 pr_err("Unable to locate %s dest_se_deve"
1686 " from destination RTPI: %hu\n",
1687 dest_tpg->se_tpg_tfo->get_fabric_name(),
1688 dest_rtpi);
1689
1690 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1691 core_scsi3_tpg_undepend_item(dest_tpg);
1692 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1693 ret = -EINVAL;
1694 goto out;
1695 }
1696
1697 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1698 if (ret < 0) {
1699 pr_err("core_scsi3_lunacl_depend_item()"
1700 " failed\n");
1701 atomic_dec(&dest_se_deve->pr_ref_count);
1702 smp_mb__after_atomic_dec();
1703 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1704 core_scsi3_tpg_undepend_item(dest_tpg);
1705 cmd->scsi_sense_reason =
1706 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710 #if 0
1711 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1712 " dest_se_deve mapped_lun: %u\n",
1713 dest_tpg->se_tpg_tfo->get_fabric_name(),
1714 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1715 #endif
1716 /*
1717 * Skip any TransportIDs that already have a registration for
1718 * this target port.
1719 */
1720 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1721 iport_ptr);
1722 if (pr_reg_e) {
1723 core_scsi3_put_pr_reg(pr_reg_e);
1724 core_scsi3_lunacl_undepend_item(dest_se_deve);
1725 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1726 core_scsi3_tpg_undepend_item(dest_tpg);
1727 ptr += tid_len;
1728 tpdl -= tid_len;
1729 tid_len = 0;
1730 continue;
1731 }
1732 /*
1733 * Allocate a struct pr_transport_id_holder and setup
1734 * the dest_node_acl and dest_se_deve pointers for the
1735 * loop below.
1736 */
1737 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1738 GFP_KERNEL);
1739 if (!tidh_new) {
1740 pr_err("Unable to allocate tidh_new\n");
1741 core_scsi3_lunacl_undepend_item(dest_se_deve);
1742 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1743 core_scsi3_tpg_undepend_item(dest_tpg);
1744 cmd->scsi_sense_reason =
1745 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1746 ret = -ENOMEM;
1747 goto out;
1748 }
1749 INIT_LIST_HEAD(&tidh_new->dest_list);
1750 tidh_new->dest_tpg = dest_tpg;
1751 tidh_new->dest_node_acl = dest_node_acl;
1752 tidh_new->dest_se_deve = dest_se_deve;
1753
1754 /*
1755 * Allocate, but do NOT add the registration for the
1756 * TransportID referenced SCSI Initiator port. This
1757 * done because of the following from spc4r17 in section
1758 * 6.14.3 wrt SPEC_I_PT:
1759 *
1760 * "If a registration fails for any initiator port (e.g., if th
1761 * logical unit does not have enough resources available to
1762 * hold the registration information), no registrations shall be
1763 * made, and the command shall be terminated with
1764 * CHECK CONDITION status."
1765 *
1766 * That means we call __core_scsi3_alloc_registration() here,
1767 * and then call __core_scsi3_add_registration() in the
1768 * 2nd loop which will never fail.
1769 */
1770 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1771 dest_node_acl, dest_se_deve, iport_ptr,
1772 sa_res_key, all_tg_pt, aptpl);
1773 if (!dest_pr_reg) {
1774 core_scsi3_lunacl_undepend_item(dest_se_deve);
1775 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1776 core_scsi3_tpg_undepend_item(dest_tpg);
1777 kfree(tidh_new);
1778 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1779 ret = -EINVAL;
1780 goto out;
1781 }
1782 tidh_new->dest_pr_reg = dest_pr_reg;
1783 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1784
1785 ptr += tid_len;
1786 tpdl -= tid_len;
1787 tid_len = 0;
1788
1789 }
1790
1791 transport_kunmap_first_data_page(cmd);
1792
1793 /*
1794 * Go ahead and create a registrations from tid_dest_list for the
1795 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1796 * and dest_se_deve.
1797 *
1798 * The SA Reservation Key from the PROUT is set for the
1799 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1800 * means that the TransportID Initiator port will be
1801 * registered on all of the target ports in the SCSI target device
1802 * ALL_TG_PT=0 means the registration will only be for the
1803 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1804 * was received.
1805 */
1806 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1807 dest_tpg = tidh->dest_tpg;
1808 dest_node_acl = tidh->dest_node_acl;
1809 dest_se_deve = tidh->dest_se_deve;
1810 dest_pr_reg = tidh->dest_pr_reg;
1811 dest_local_nexus = tidh->dest_local_nexus;
1812
1813 list_del(&tidh->dest_list);
1814 kfree(tidh);
1815
1816 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1817 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1818 PR_REG_ISID_ID_LEN);
1819
1820 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1821 dest_pr_reg, 0, 0);
1822
1823 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1824 " registered Transport ID for Node: %s%s Mapped LUN:"
1825 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1826 dest_node_acl->initiatorname, (prf_isid) ?
1827 &i_buf[0] : "", dest_se_deve->mapped_lun);
1828
1829 if (dest_local_nexus)
1830 continue;
1831
1832 core_scsi3_lunacl_undepend_item(dest_se_deve);
1833 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1834 core_scsi3_tpg_undepend_item(dest_tpg);
1835 }
1836
1837 return 0;
1838 out:
1839 transport_kunmap_first_data_page(cmd);
1840 /*
1841 * For the failure case, release everything from tid_dest_list
1842 * including *dest_pr_reg and the configfs dependances..
1843 */
1844 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1845 dest_tpg = tidh->dest_tpg;
1846 dest_node_acl = tidh->dest_node_acl;
1847 dest_se_deve = tidh->dest_se_deve;
1848 dest_pr_reg = tidh->dest_pr_reg;
1849 dest_local_nexus = tidh->dest_local_nexus;
1850
1851 list_del(&tidh->dest_list);
1852 kfree(tidh);
1853 /*
1854 * Release any extra ALL_TG_PT=1 registrations for
1855 * the SPEC_I_PT=1 case.
1856 */
1857 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1858 &dest_pr_reg->pr_reg_atp_list,
1859 pr_reg_atp_mem_list) {
1860 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1861 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1862 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1863 }
1864
1865 kfree(dest_pr_reg->pr_aptpl_buf);
1866 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1867
1868 if (dest_local_nexus)
1869 continue;
1870
1871 core_scsi3_lunacl_undepend_item(dest_se_deve);
1872 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1873 core_scsi3_tpg_undepend_item(dest_tpg);
1874 }
1875 return ret;
1876 }
1877
1878 /*
1879 * Called with struct se_device->dev_reservation_lock held
1880 */
1881 static int __core_scsi3_update_aptpl_buf(
1882 struct se_device *dev,
1883 unsigned char *buf,
1884 u32 pr_aptpl_buf_len,
1885 int clear_aptpl_metadata)
1886 {
1887 struct se_lun *lun;
1888 struct se_portal_group *tpg;
1889 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1890 struct t10_pr_registration *pr_reg;
1891 unsigned char tmp[512], isid_buf[32];
1892 ssize_t len = 0;
1893 int reg_count = 0;
1894
1895 memset(buf, 0, pr_aptpl_buf_len);
1896 /*
1897 * Called to clear metadata once APTPL has been deactivated.
1898 */
1899 if (clear_aptpl_metadata) {
1900 snprintf(buf, pr_aptpl_buf_len,
1901 "No Registrations or Reservations\n");
1902 return 0;
1903 }
1904 /*
1905 * Walk the registration list..
1906 */
1907 spin_lock(&su_dev->t10_pr.registration_lock);
1908 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1909 pr_reg_list) {
1910
1911 tmp[0] = '\0';
1912 isid_buf[0] = '\0';
1913 tpg = pr_reg->pr_reg_nacl->se_tpg;
1914 lun = pr_reg->pr_reg_tg_pt_lun;
1915 /*
1916 * Write out any ISID value to APTPL metadata that was included
1917 * in the original registration.
1918 */
1919 if (pr_reg->isid_present_at_reg)
1920 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1921 pr_reg->pr_reg_isid);
1922 /*
1923 * Include special metadata if the pr_reg matches the
1924 * reservation holder.
1925 */
1926 if (dev->dev_pr_res_holder == pr_reg) {
1927 snprintf(tmp, 512, "PR_REG_START: %d"
1928 "\ninitiator_fabric=%s\n"
1929 "initiator_node=%s\n%s"
1930 "sa_res_key=%llu\n"
1931 "res_holder=1\nres_type=%02x\n"
1932 "res_scope=%02x\nres_all_tg_pt=%d\n"
1933 "mapped_lun=%u\n", reg_count,
1934 tpg->se_tpg_tfo->get_fabric_name(),
1935 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1936 pr_reg->pr_res_key, pr_reg->pr_res_type,
1937 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1938 pr_reg->pr_res_mapped_lun);
1939 } else {
1940 snprintf(tmp, 512, "PR_REG_START: %d\n"
1941 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1942 "sa_res_key=%llu\nres_holder=0\n"
1943 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1944 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1945 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1946 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1947 pr_reg->pr_res_mapped_lun);
1948 }
1949
1950 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1951 pr_err("Unable to update renaming"
1952 " APTPL metadata\n");
1953 spin_unlock(&su_dev->t10_pr.registration_lock);
1954 return -EMSGSIZE;
1955 }
1956 len += sprintf(buf+len, "%s", tmp);
1957
1958 /*
1959 * Include information about the associated SCSI target port.
1960 */
1961 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1962 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1963 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1964 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1965 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1966 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1967
1968 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1969 pr_err("Unable to update renaming"
1970 " APTPL metadata\n");
1971 spin_unlock(&su_dev->t10_pr.registration_lock);
1972 return -EMSGSIZE;
1973 }
1974 len += sprintf(buf+len, "%s", tmp);
1975 reg_count++;
1976 }
1977 spin_unlock(&su_dev->t10_pr.registration_lock);
1978
1979 if (!reg_count)
1980 len += sprintf(buf+len, "No Registrations or Reservations");
1981
1982 return 0;
1983 }
1984
1985 static int core_scsi3_update_aptpl_buf(
1986 struct se_device *dev,
1987 unsigned char *buf,
1988 u32 pr_aptpl_buf_len,
1989 int clear_aptpl_metadata)
1990 {
1991 int ret;
1992
1993 spin_lock(&dev->dev_reservation_lock);
1994 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1995 clear_aptpl_metadata);
1996 spin_unlock(&dev->dev_reservation_lock);
1997
1998 return ret;
1999 }
2000
2001 /*
2002 * Called with struct se_device->aptpl_file_mutex held
2003 */
2004 static int __core_scsi3_write_aptpl_to_file(
2005 struct se_device *dev,
2006 unsigned char *buf,
2007 u32 pr_aptpl_buf_len)
2008 {
2009 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
2010 struct file *file;
2011 struct iovec iov[1];
2012 mm_segment_t old_fs;
2013 int flags = O_RDWR | O_CREAT | O_TRUNC;
2014 char path[512];
2015 int ret;
2016
2017 memset(iov, 0, sizeof(struct iovec));
2018 memset(path, 0, 512);
2019
2020 if (strlen(&wwn->unit_serial[0]) >= 512) {
2021 pr_err("WWN value for struct se_device does not fit"
2022 " into path buffer\n");
2023 return -EMSGSIZE;
2024 }
2025
2026 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2027 file = filp_open(path, flags, 0600);
2028 if (IS_ERR(file) || !file || !file->f_dentry) {
2029 pr_err("filp_open(%s) for APTPL metadata"
2030 " failed\n", path);
2031 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2032 }
2033
2034 iov[0].iov_base = &buf[0];
2035 if (!pr_aptpl_buf_len)
2036 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2037 else
2038 iov[0].iov_len = pr_aptpl_buf_len;
2039
2040 old_fs = get_fs();
2041 set_fs(get_ds());
2042 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2043 set_fs(old_fs);
2044
2045 if (ret < 0) {
2046 pr_debug("Error writing APTPL metadata file: %s\n", path);
2047 filp_close(file, NULL);
2048 return -EIO;
2049 }
2050 filp_close(file, NULL);
2051
2052 return 0;
2053 }
2054
2055 static int core_scsi3_update_and_write_aptpl(
2056 struct se_device *dev,
2057 unsigned char *in_buf,
2058 u32 in_pr_aptpl_buf_len)
2059 {
2060 unsigned char null_buf[64], *buf;
2061 u32 pr_aptpl_buf_len;
2062 int ret, clear_aptpl_metadata = 0;
2063 /*
2064 * Can be called with a NULL pointer from PROUT service action CLEAR
2065 */
2066 if (!in_buf) {
2067 memset(null_buf, 0, 64);
2068 buf = &null_buf[0];
2069 /*
2070 * This will clear the APTPL metadata to:
2071 * "No Registrations or Reservations" status
2072 */
2073 pr_aptpl_buf_len = 64;
2074 clear_aptpl_metadata = 1;
2075 } else {
2076 buf = in_buf;
2077 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2078 }
2079
2080 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2081 clear_aptpl_metadata);
2082 if (ret != 0)
2083 return ret;
2084 /*
2085 * __core_scsi3_write_aptpl_to_file() will call strlen()
2086 * on the passed buf to determine pr_aptpl_buf_len.
2087 */
2088 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2089 if (ret != 0)
2090 return ret;
2091
2092 return ret;
2093 }
2094
2095 static int core_scsi3_emulate_pro_register(
2096 struct se_cmd *cmd,
2097 u64 res_key,
2098 u64 sa_res_key,
2099 int aptpl,
2100 int all_tg_pt,
2101 int spec_i_pt,
2102 int ignore_key)
2103 {
2104 struct se_session *se_sess = cmd->se_sess;
2105 struct se_device *dev = cmd->se_dev;
2106 struct se_dev_entry *se_deve;
2107 struct se_lun *se_lun = cmd->se_lun;
2108 struct se_portal_group *se_tpg;
2109 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2110 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2111 /* Used for APTPL metadata w/ UNREGISTER */
2112 unsigned char *pr_aptpl_buf = NULL;
2113 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2114 int pr_holder = 0, ret = 0, type;
2115
2116 if (!se_sess || !se_lun) {
2117 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2118 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2119 return -EINVAL;
2120 }
2121 se_tpg = se_sess->se_tpg;
2122 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2123
2124 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2125 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2126 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2127 PR_REG_ISID_LEN);
2128 isid_ptr = &isid_buf[0];
2129 }
2130 /*
2131 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2132 */
2133 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2134 if (!pr_reg_e) {
2135 if (res_key) {
2136 pr_warn("SPC-3 PR: Reservation Key non-zero"
2137 " for SA REGISTER, returning CONFLICT\n");
2138 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2139 return -EINVAL;
2140 }
2141 /*
2142 * Do nothing but return GOOD status.
2143 */
2144 if (!sa_res_key)
2145 return 0;
2146
2147 if (!spec_i_pt) {
2148 /*
2149 * Perform the Service Action REGISTER on the Initiator
2150 * Port Endpoint that the PRO was received from on the
2151 * Logical Unit of the SCSI device server.
2152 */
2153 ret = core_scsi3_alloc_registration(cmd->se_dev,
2154 se_sess->se_node_acl, se_deve, isid_ptr,
2155 sa_res_key, all_tg_pt, aptpl,
2156 ignore_key, 0);
2157 if (ret != 0) {
2158 pr_err("Unable to allocate"
2159 " struct t10_pr_registration\n");
2160 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2161 return -EINVAL;
2162 }
2163 } else {
2164 /*
2165 * Register both the Initiator port that received
2166 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2167 * TransportID from Parameter list and loop through
2168 * fabric dependent parameter list while calling
2169 * logic from of core_scsi3_alloc_registration() for
2170 * each TransportID provided SCSI Initiator Port/Device
2171 */
2172 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2173 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2174 if (ret != 0)
2175 return ret;
2176 }
2177 /*
2178 * Nothing left to do for the APTPL=0 case.
2179 */
2180 if (!aptpl) {
2181 pr_tmpl->pr_aptpl_active = 0;
2182 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2183 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2184 " REGISTER\n");
2185 return 0;
2186 }
2187 /*
2188 * Locate the newly allocated local I_T Nexus *pr_reg, and
2189 * update the APTPL metadata information using its
2190 * preallocated *pr_reg->pr_aptpl_buf.
2191 */
2192 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2193 se_sess->se_node_acl, se_sess);
2194
2195 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2196 &pr_reg->pr_aptpl_buf[0],
2197 pr_tmpl->pr_aptpl_buf_len);
2198 if (!ret) {
2199 pr_tmpl->pr_aptpl_active = 1;
2200 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2201 }
2202
2203 core_scsi3_put_pr_reg(pr_reg);
2204 return ret;
2205 } else {
2206 /*
2207 * Locate the existing *pr_reg via struct se_node_acl pointers
2208 */
2209 pr_reg = pr_reg_e;
2210 type = pr_reg->pr_res_type;
2211
2212 if (!ignore_key) {
2213 if (res_key != pr_reg->pr_res_key) {
2214 pr_err("SPC-3 PR REGISTER: Received"
2215 " res_key: 0x%016Lx does not match"
2216 " existing SA REGISTER res_key:"
2217 " 0x%016Lx\n", res_key,
2218 pr_reg->pr_res_key);
2219 core_scsi3_put_pr_reg(pr_reg);
2220 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2221 return -EINVAL;
2222 }
2223 }
2224 if (spec_i_pt) {
2225 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2226 " set while sa_res_key=0\n");
2227 core_scsi3_put_pr_reg(pr_reg);
2228 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2229 return -EINVAL;
2230 }
2231 /*
2232 * An existing ALL_TG_PT=1 registration being released
2233 * must also set ALL_TG_PT=1 in the incoming PROUT.
2234 */
2235 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2236 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2237 " registration exists, but ALL_TG_PT=1 bit not"
2238 " present in received PROUT\n");
2239 core_scsi3_put_pr_reg(pr_reg);
2240 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2241 return -EINVAL;
2242 }
2243 /*
2244 * Allocate APTPL metadata buffer used for UNREGISTER ops
2245 */
2246 if (aptpl) {
2247 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2248 GFP_KERNEL);
2249 if (!pr_aptpl_buf) {
2250 pr_err("Unable to allocate"
2251 " pr_aptpl_buf\n");
2252 core_scsi3_put_pr_reg(pr_reg);
2253 cmd->scsi_sense_reason =
2254 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2255 return -EINVAL;
2256 }
2257 }
2258 /*
2259 * sa_res_key=0 Unregister Reservation Key for registered I_T
2260 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2261 * Nexus.
2262 */
2263 if (!sa_res_key) {
2264 pr_holder = core_scsi3_check_implict_release(
2265 cmd->se_dev, pr_reg);
2266 if (pr_holder < 0) {
2267 kfree(pr_aptpl_buf);
2268 core_scsi3_put_pr_reg(pr_reg);
2269 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2270 return -EINVAL;
2271 }
2272
2273 spin_lock(&pr_tmpl->registration_lock);
2274 /*
2275 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2276 * and matching pr_res_key.
2277 */
2278 if (pr_reg->pr_reg_all_tg_pt) {
2279 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2280 &pr_tmpl->registration_list,
2281 pr_reg_list) {
2282
2283 if (!pr_reg_p->pr_reg_all_tg_pt)
2284 continue;
2285
2286 if (pr_reg_p->pr_res_key != res_key)
2287 continue;
2288
2289 if (pr_reg == pr_reg_p)
2290 continue;
2291
2292 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2293 pr_reg_p->pr_reg_nacl->initiatorname))
2294 continue;
2295
2296 __core_scsi3_free_registration(dev,
2297 pr_reg_p, NULL, 0);
2298 }
2299 }
2300 /*
2301 * Release the calling I_T Nexus registration now..
2302 */
2303 __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2304 NULL, 1);
2305 /*
2306 * From spc4r17, section 5.7.11.3 Unregistering
2307 *
2308 * If the persistent reservation is a registrants only
2309 * type, the device server shall establish a unit
2310 * attention condition for the initiator port associated
2311 * with every registered I_T nexus except for the I_T
2312 * nexus on which the PERSISTENT RESERVE OUT command was
2313 * received, with the additional sense code set to
2314 * RESERVATIONS RELEASED.
2315 */
2316 if (pr_holder &&
2317 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2318 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2319 list_for_each_entry(pr_reg_p,
2320 &pr_tmpl->registration_list,
2321 pr_reg_list) {
2322
2323 core_scsi3_ua_allocate(
2324 pr_reg_p->pr_reg_nacl,
2325 pr_reg_p->pr_res_mapped_lun,
2326 0x2A,
2327 ASCQ_2AH_RESERVATIONS_RELEASED);
2328 }
2329 }
2330 spin_unlock(&pr_tmpl->registration_lock);
2331
2332 if (!aptpl) {
2333 pr_tmpl->pr_aptpl_active = 0;
2334 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2335 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2336 " for UNREGISTER\n");
2337 return 0;
2338 }
2339
2340 ret = core_scsi3_update_and_write_aptpl(dev,
2341 &pr_aptpl_buf[0],
2342 pr_tmpl->pr_aptpl_buf_len);
2343 if (!ret) {
2344 pr_tmpl->pr_aptpl_active = 1;
2345 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2346 " for UNREGISTER\n");
2347 }
2348
2349 kfree(pr_aptpl_buf);
2350 return ret;
2351 } else {
2352 /*
2353 * Increment PRgeneration counter for struct se_device"
2354 * upon a successful REGISTER, see spc4r17 section 6.3.2
2355 * READ_KEYS service action.
2356 */
2357 pr_reg->pr_res_generation = core_scsi3_pr_generation(
2358 cmd->se_dev);
2359 pr_reg->pr_res_key = sa_res_key;
2360 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2361 " Key for %s to: 0x%016Lx PRgeneration:"
2362 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2363 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2364 pr_reg->pr_reg_nacl->initiatorname,
2365 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2366
2367 if (!aptpl) {
2368 pr_tmpl->pr_aptpl_active = 0;
2369 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2370 core_scsi3_put_pr_reg(pr_reg);
2371 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2372 " for REGISTER\n");
2373 return 0;
2374 }
2375
2376 ret = core_scsi3_update_and_write_aptpl(dev,
2377 &pr_aptpl_buf[0],
2378 pr_tmpl->pr_aptpl_buf_len);
2379 if (!ret) {
2380 pr_tmpl->pr_aptpl_active = 1;
2381 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2382 " for REGISTER\n");
2383 }
2384
2385 kfree(pr_aptpl_buf);
2386 core_scsi3_put_pr_reg(pr_reg);
2387 }
2388 }
2389 return 0;
2390 }
2391
2392 unsigned char *core_scsi3_pr_dump_type(int type)
2393 {
2394 switch (type) {
2395 case PR_TYPE_WRITE_EXCLUSIVE:
2396 return "Write Exclusive Access";
2397 case PR_TYPE_EXCLUSIVE_ACCESS:
2398 return "Exclusive Access";
2399 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2400 return "Write Exclusive Access, Registrants Only";
2401 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2402 return "Exclusive Access, Registrants Only";
2403 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2404 return "Write Exclusive Access, All Registrants";
2405 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2406 return "Exclusive Access, All Registrants";
2407 default:
2408 break;
2409 }
2410
2411 return "Unknown SPC-3 PR Type";
2412 }
2413
2414 static int core_scsi3_pro_reserve(
2415 struct se_cmd *cmd,
2416 struct se_device *dev,
2417 int type,
2418 int scope,
2419 u64 res_key)
2420 {
2421 struct se_session *se_sess = cmd->se_sess;
2422 struct se_dev_entry *se_deve;
2423 struct se_lun *se_lun = cmd->se_lun;
2424 struct se_portal_group *se_tpg;
2425 struct t10_pr_registration *pr_reg, *pr_res_holder;
2426 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2427 char i_buf[PR_REG_ISID_ID_LEN];
2428 int ret, prf_isid;
2429
2430 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2431
2432 if (!se_sess || !se_lun) {
2433 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2434 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2435 return -EINVAL;
2436 }
2437 se_tpg = se_sess->se_tpg;
2438 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2439 /*
2440 * Locate the existing *pr_reg via struct se_node_acl pointers
2441 */
2442 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2443 se_sess);
2444 if (!pr_reg) {
2445 pr_err("SPC-3 PR: Unable to locate"
2446 " PR_REGISTERED *pr_reg for RESERVE\n");
2447 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2448 return -EINVAL;
2449 }
2450 /*
2451 * From spc4r17 Section 5.7.9: Reserving:
2452 *
2453 * An application client creates a persistent reservation by issuing
2454 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2455 * a registered I_T nexus with the following parameters:
2456 * a) RESERVATION KEY set to the value of the reservation key that is
2457 * registered with the logical unit for the I_T nexus; and
2458 */
2459 if (res_key != pr_reg->pr_res_key) {
2460 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2461 " does not match existing SA REGISTER res_key:"
2462 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2463 core_scsi3_put_pr_reg(pr_reg);
2464 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2465 return -EINVAL;
2466 }
2467 /*
2468 * From spc4r17 Section 5.7.9: Reserving:
2469 *
2470 * From above:
2471 * b) TYPE field and SCOPE field set to the persistent reservation
2472 * being created.
2473 *
2474 * Only one persistent reservation is allowed at a time per logical unit
2475 * and that persistent reservation has a scope of LU_SCOPE.
2476 */
2477 if (scope != PR_SCOPE_LU_SCOPE) {
2478 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2479 core_scsi3_put_pr_reg(pr_reg);
2480 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2481 return -EINVAL;
2482 }
2483 /*
2484 * See if we have an existing PR reservation holder pointer at
2485 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2486 * *pr_res_holder.
2487 */
2488 spin_lock(&dev->dev_reservation_lock);
2489 pr_res_holder = dev->dev_pr_res_holder;
2490 if ((pr_res_holder)) {
2491 /*
2492 * From spc4r17 Section 5.7.9: Reserving:
2493 *
2494 * If the device server receives a PERSISTENT RESERVE OUT
2495 * command from an I_T nexus other than a persistent reservation
2496 * holder (see 5.7.10) that attempts to create a persistent
2497 * reservation when a persistent reservation already exists for
2498 * the logical unit, then the command shall be completed with
2499 * RESERVATION CONFLICT status.
2500 */
2501 if (pr_res_holder != pr_reg) {
2502 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2503 pr_err("SPC-3 PR: Attempted RESERVE from"
2504 " [%s]: %s while reservation already held by"
2505 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2506 cmd->se_tfo->get_fabric_name(),
2507 se_sess->se_node_acl->initiatorname,
2508 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2509 pr_res_holder->pr_reg_nacl->initiatorname);
2510
2511 spin_unlock(&dev->dev_reservation_lock);
2512 core_scsi3_put_pr_reg(pr_reg);
2513 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2514 return -EINVAL;
2515 }
2516 /*
2517 * From spc4r17 Section 5.7.9: Reserving:
2518 *
2519 * If a persistent reservation holder attempts to modify the
2520 * type or scope of an existing persistent reservation, the
2521 * command shall be completed with RESERVATION CONFLICT status.
2522 */
2523 if ((pr_res_holder->pr_res_type != type) ||
2524 (pr_res_holder->pr_res_scope != scope)) {
2525 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2526 pr_err("SPC-3 PR: Attempted RESERVE from"
2527 " [%s]: %s trying to change TYPE and/or SCOPE,"
2528 " while reservation already held by [%s]: %s,"
2529 " returning RESERVATION_CONFLICT\n",
2530 cmd->se_tfo->get_fabric_name(),
2531 se_sess->se_node_acl->initiatorname,
2532 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2533 pr_res_holder->pr_reg_nacl->initiatorname);
2534
2535 spin_unlock(&dev->dev_reservation_lock);
2536 core_scsi3_put_pr_reg(pr_reg);
2537 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2538 return -EINVAL;
2539 }
2540 /*
2541 * From spc4r17 Section 5.7.9: Reserving:
2542 *
2543 * If the device server receives a PERSISTENT RESERVE OUT
2544 * command with RESERVE service action where the TYPE field and
2545 * the SCOPE field contain the same values as the existing type
2546 * and scope from a persistent reservation holder, it shall not
2547 * make any change to the existing persistent reservation and
2548 * shall completethe command with GOOD status.
2549 */
2550 spin_unlock(&dev->dev_reservation_lock);
2551 core_scsi3_put_pr_reg(pr_reg);
2552 return 0;
2553 }
2554 /*
2555 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2556 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2557 */
2558 pr_reg->pr_res_scope = scope;
2559 pr_reg->pr_res_type = type;
2560 pr_reg->pr_res_holder = 1;
2561 dev->dev_pr_res_holder = pr_reg;
2562 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2563 PR_REG_ISID_ID_LEN);
2564
2565 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2566 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2567 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2568 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2569 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2570 cmd->se_tfo->get_fabric_name(),
2571 se_sess->se_node_acl->initiatorname,
2572 (prf_isid) ? &i_buf[0] : "");
2573 spin_unlock(&dev->dev_reservation_lock);
2574
2575 if (pr_tmpl->pr_aptpl_active) {
2576 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2577 &pr_reg->pr_aptpl_buf[0],
2578 pr_tmpl->pr_aptpl_buf_len);
2579 if (!ret)
2580 pr_debug("SPC-3 PR: Updated APTPL metadata"
2581 " for RESERVE\n");
2582 }
2583
2584 core_scsi3_put_pr_reg(pr_reg);
2585 return 0;
2586 }
2587
2588 static int core_scsi3_emulate_pro_reserve(
2589 struct se_cmd *cmd,
2590 int type,
2591 int scope,
2592 u64 res_key)
2593 {
2594 struct se_device *dev = cmd->se_dev;
2595 int ret = 0;
2596
2597 switch (type) {
2598 case PR_TYPE_WRITE_EXCLUSIVE:
2599 case PR_TYPE_EXCLUSIVE_ACCESS:
2600 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2601 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2602 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2603 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2604 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2605 break;
2606 default:
2607 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2608 " 0x%02x\n", type);
2609 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2610 return -EINVAL;
2611 }
2612
2613 return ret;
2614 }
2615
2616 /*
2617 * Called with struct se_device->dev_reservation_lock held.
2618 */
2619 static void __core_scsi3_complete_pro_release(
2620 struct se_device *dev,
2621 struct se_node_acl *se_nacl,
2622 struct t10_pr_registration *pr_reg,
2623 int explict)
2624 {
2625 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2626 char i_buf[PR_REG_ISID_ID_LEN];
2627 int prf_isid;
2628
2629 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2630 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2631 PR_REG_ISID_ID_LEN);
2632 /*
2633 * Go ahead and release the current PR reservation holder.
2634 */
2635 dev->dev_pr_res_holder = NULL;
2636
2637 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2638 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2639 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2640 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2641 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2642 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2643 tfo->get_fabric_name(), se_nacl->initiatorname,
2644 (prf_isid) ? &i_buf[0] : "");
2645 /*
2646 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2647 */
2648 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2649 }
2650
2651 static int core_scsi3_emulate_pro_release(
2652 struct se_cmd *cmd,
2653 int type,
2654 int scope,
2655 u64 res_key)
2656 {
2657 struct se_device *dev = cmd->se_dev;
2658 struct se_session *se_sess = cmd->se_sess;
2659 struct se_lun *se_lun = cmd->se_lun;
2660 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2661 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2662 int ret, all_reg = 0;
2663
2664 if (!se_sess || !se_lun) {
2665 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2666 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2667 return -EINVAL;
2668 }
2669 /*
2670 * Locate the existing *pr_reg via struct se_node_acl pointers
2671 */
2672 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2673 if (!pr_reg) {
2674 pr_err("SPC-3 PR: Unable to locate"
2675 " PR_REGISTERED *pr_reg for RELEASE\n");
2676 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2677 return -EINVAL;
2678 }
2679 /*
2680 * From spc4r17 Section 5.7.11.2 Releasing:
2681 *
2682 * If there is no persistent reservation or in response to a persistent
2683 * reservation release request from a registered I_T nexus that is not a
2684 * persistent reservation holder (see 5.7.10), the device server shall
2685 * do the following:
2686 *
2687 * a) Not release the persistent reservation, if any;
2688 * b) Not remove any registrations; and
2689 * c) Complete the command with GOOD status.
2690 */
2691 spin_lock(&dev->dev_reservation_lock);
2692 pr_res_holder = dev->dev_pr_res_holder;
2693 if (!pr_res_holder) {
2694 /*
2695 * No persistent reservation, return GOOD status.
2696 */
2697 spin_unlock(&dev->dev_reservation_lock);
2698 core_scsi3_put_pr_reg(pr_reg);
2699 return 0;
2700 }
2701 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2702 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2703 all_reg = 1;
2704
2705 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2706 /*
2707 * Non 'All Registrants' PR Type cases..
2708 * Release request from a registered I_T nexus that is not a
2709 * persistent reservation holder. return GOOD status.
2710 */
2711 spin_unlock(&dev->dev_reservation_lock);
2712 core_scsi3_put_pr_reg(pr_reg);
2713 return 0;
2714 }
2715 /*
2716 * From spc4r17 Section 5.7.11.2 Releasing:
2717 *
2718 * Only the persistent reservation holder (see 5.7.10) is allowed to
2719 * release a persistent reservation.
2720 *
2721 * An application client releases the persistent reservation by issuing
2722 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2723 * an I_T nexus that is a persistent reservation holder with the
2724 * following parameters:
2725 *
2726 * a) RESERVATION KEY field set to the value of the reservation key
2727 * that is registered with the logical unit for the I_T nexus;
2728 */
2729 if (res_key != pr_reg->pr_res_key) {
2730 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2731 " does not match existing SA REGISTER res_key:"
2732 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2733 spin_unlock(&dev->dev_reservation_lock);
2734 core_scsi3_put_pr_reg(pr_reg);
2735 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2736 return -EINVAL;
2737 }
2738 /*
2739 * From spc4r17 Section 5.7.11.2 Releasing and above:
2740 *
2741 * b) TYPE field and SCOPE field set to match the persistent
2742 * reservation being released.
2743 */
2744 if ((pr_res_holder->pr_res_type != type) ||
2745 (pr_res_holder->pr_res_scope != scope)) {
2746 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2747 pr_err("SPC-3 PR RELEASE: Attempted to release"
2748 " reservation from [%s]: %s with different TYPE "
2749 "and/or SCOPE while reservation already held by"
2750 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2751 cmd->se_tfo->get_fabric_name(),
2752 se_sess->se_node_acl->initiatorname,
2753 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2754 pr_res_holder->pr_reg_nacl->initiatorname);
2755
2756 spin_unlock(&dev->dev_reservation_lock);
2757 core_scsi3_put_pr_reg(pr_reg);
2758 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2759 return -EINVAL;
2760 }
2761 /*
2762 * In response to a persistent reservation release request from the
2763 * persistent reservation holder the device server shall perform a
2764 * release by doing the following as an uninterrupted series of actions:
2765 * a) Release the persistent reservation;
2766 * b) Not remove any registration(s);
2767 * c) If the released persistent reservation is a registrants only type
2768 * or all registrants type persistent reservation,
2769 * the device server shall establish a unit attention condition for
2770 * the initiator port associated with every regis-
2771 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2772 * RESERVE OUT command with RELEASE service action was received,
2773 * with the additional sense code set to RESERVATIONS RELEASED; and
2774 * d) If the persistent reservation is of any other type, the device
2775 * server shall not establish a unit attention condition.
2776 */
2777 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2778 pr_reg, 1);
2779
2780 spin_unlock(&dev->dev_reservation_lock);
2781
2782 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2783 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2784 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2785 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2786 /*
2787 * If no UNIT ATTENTION conditions will be established for
2788 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2789 * go ahead and check for APTPL=1 update+write below
2790 */
2791 goto write_aptpl;
2792 }
2793
2794 spin_lock(&pr_tmpl->registration_lock);
2795 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2796 pr_reg_list) {
2797 /*
2798 * Do not establish a UNIT ATTENTION condition
2799 * for the calling I_T Nexus
2800 */
2801 if (pr_reg_p == pr_reg)
2802 continue;
2803
2804 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2805 pr_reg_p->pr_res_mapped_lun,
2806 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2807 }
2808 spin_unlock(&pr_tmpl->registration_lock);
2809
2810 write_aptpl:
2811 if (pr_tmpl->pr_aptpl_active) {
2812 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2813 &pr_reg->pr_aptpl_buf[0],
2814 pr_tmpl->pr_aptpl_buf_len);
2815 if (!ret)
2816 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2817 }
2818
2819 core_scsi3_put_pr_reg(pr_reg);
2820 return 0;
2821 }
2822
2823 static int core_scsi3_emulate_pro_clear(
2824 struct se_cmd *cmd,
2825 u64 res_key)
2826 {
2827 struct se_device *dev = cmd->se_dev;
2828 struct se_node_acl *pr_reg_nacl;
2829 struct se_session *se_sess = cmd->se_sess;
2830 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2831 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2832 u32 pr_res_mapped_lun = 0;
2833 int calling_it_nexus = 0;
2834 /*
2835 * Locate the existing *pr_reg via struct se_node_acl pointers
2836 */
2837 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2838 se_sess->se_node_acl, se_sess);
2839 if (!pr_reg_n) {
2840 pr_err("SPC-3 PR: Unable to locate"
2841 " PR_REGISTERED *pr_reg for CLEAR\n");
2842 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2843 return -EINVAL;
2844 }
2845 /*
2846 * From spc4r17 section 5.7.11.6, Clearing:
2847 *
2848 * Any application client may release the persistent reservation and
2849 * remove all registrations from a device server by issuing a
2850 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2851 * registered I_T nexus with the following parameter:
2852 *
2853 * a) RESERVATION KEY field set to the value of the reservation key
2854 * that is registered with the logical unit for the I_T nexus.
2855 */
2856 if (res_key != pr_reg_n->pr_res_key) {
2857 pr_err("SPC-3 PR REGISTER: Received"
2858 " res_key: 0x%016Lx does not match"
2859 " existing SA REGISTER res_key:"
2860 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2861 core_scsi3_put_pr_reg(pr_reg_n);
2862 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2863 return -EINVAL;
2864 }
2865 /*
2866 * a) Release the persistent reservation, if any;
2867 */
2868 spin_lock(&dev->dev_reservation_lock);
2869 pr_res_holder = dev->dev_pr_res_holder;
2870 if (pr_res_holder) {
2871 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2872 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2873 pr_res_holder, 0);
2874 }
2875 spin_unlock(&dev->dev_reservation_lock);
2876 /*
2877 * b) Remove all registration(s) (see spc4r17 5.7.7);
2878 */
2879 spin_lock(&pr_tmpl->registration_lock);
2880 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2881 &pr_tmpl->registration_list, pr_reg_list) {
2882
2883 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2884 pr_reg_nacl = pr_reg->pr_reg_nacl;
2885 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2886 __core_scsi3_free_registration(dev, pr_reg, NULL,
2887 calling_it_nexus);
2888 /*
2889 * e) Establish a unit attention condition for the initiator
2890 * port associated with every registered I_T nexus other
2891 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2892 * command with CLEAR service action was received, with the
2893 * additional sense code set to RESERVATIONS PREEMPTED.
2894 */
2895 if (!calling_it_nexus)
2896 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2897 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2898 }
2899 spin_unlock(&pr_tmpl->registration_lock);
2900
2901 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2902 cmd->se_tfo->get_fabric_name());
2903
2904 if (pr_tmpl->pr_aptpl_active) {
2905 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2906 pr_debug("SPC-3 PR: Updated APTPL metadata"
2907 " for CLEAR\n");
2908 }
2909
2910 core_scsi3_pr_generation(dev);
2911 return 0;
2912 }
2913
2914 /*
2915 * Called with struct se_device->dev_reservation_lock held.
2916 */
2917 static void __core_scsi3_complete_pro_preempt(
2918 struct se_device *dev,
2919 struct t10_pr_registration *pr_reg,
2920 struct list_head *preempt_and_abort_list,
2921 int type,
2922 int scope,
2923 int abort)
2924 {
2925 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2926 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2927 char i_buf[PR_REG_ISID_ID_LEN];
2928 int prf_isid;
2929
2930 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2931 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2932 PR_REG_ISID_ID_LEN);
2933 /*
2934 * Do an implict RELEASE of the existing reservation.
2935 */
2936 if (dev->dev_pr_res_holder)
2937 __core_scsi3_complete_pro_release(dev, nacl,
2938 dev->dev_pr_res_holder, 0);
2939
2940 dev->dev_pr_res_holder = pr_reg;
2941 pr_reg->pr_res_holder = 1;
2942 pr_reg->pr_res_type = type;
2943 pr_reg->pr_res_scope = scope;
2944
2945 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2946 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2947 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2948 core_scsi3_pr_dump_type(type),
2949 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2950 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2951 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2952 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2953 /*
2954 * For PREEMPT_AND_ABORT, add the preempting reservation's
2955 * struct t10_pr_registration to the list that will be compared
2956 * against received CDBs..
2957 */
2958 if (preempt_and_abort_list)
2959 list_add_tail(&pr_reg->pr_reg_abort_list,
2960 preempt_and_abort_list);
2961 }
2962
2963 static void core_scsi3_release_preempt_and_abort(
2964 struct list_head *preempt_and_abort_list,
2965 struct t10_pr_registration *pr_reg_holder)
2966 {
2967 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2968
2969 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2970 pr_reg_abort_list) {
2971
2972 list_del(&pr_reg->pr_reg_abort_list);
2973 if (pr_reg_holder == pr_reg)
2974 continue;
2975 if (pr_reg->pr_res_holder) {
2976 pr_warn("pr_reg->pr_res_holder still set\n");
2977 continue;
2978 }
2979
2980 pr_reg->pr_reg_deve = NULL;
2981 pr_reg->pr_reg_nacl = NULL;
2982 kfree(pr_reg->pr_aptpl_buf);
2983 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2984 }
2985 }
2986
2987 int core_scsi3_check_cdb_abort_and_preempt(
2988 struct list_head *preempt_and_abort_list,
2989 struct se_cmd *cmd)
2990 {
2991 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2992
2993 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2994 pr_reg_abort_list) {
2995 if (pr_reg->pr_res_key == cmd->pr_res_key)
2996 return 0;
2997 }
2998
2999 return 1;
3000 }
3001
3002 static int core_scsi3_pro_preempt(
3003 struct se_cmd *cmd,
3004 int type,
3005 int scope,
3006 u64 res_key,
3007 u64 sa_res_key,
3008 int abort)
3009 {
3010 struct se_device *dev = cmd->se_dev;
3011 struct se_dev_entry *se_deve;
3012 struct se_node_acl *pr_reg_nacl;
3013 struct se_session *se_sess = cmd->se_sess;
3014 struct list_head preempt_and_abort_list;
3015 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
3016 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3017 u32 pr_res_mapped_lun = 0;
3018 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
3019 int prh_type = 0, prh_scope = 0, ret;
3020
3021 if (!se_sess) {
3022 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3023 return -EINVAL;
3024 }
3025
3026 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3027 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3028 se_sess);
3029 if (!pr_reg_n) {
3030 pr_err("SPC-3 PR: Unable to locate"
3031 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
3032 (abort) ? "_AND_ABORT" : "");
3033 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3034 return -EINVAL;
3035 }
3036 if (pr_reg_n->pr_res_key != res_key) {
3037 core_scsi3_put_pr_reg(pr_reg_n);
3038 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3039 return -EINVAL;
3040 }
3041 if (scope != PR_SCOPE_LU_SCOPE) {
3042 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
3043 core_scsi3_put_pr_reg(pr_reg_n);
3044 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3045 return -EINVAL;
3046 }
3047 INIT_LIST_HEAD(&preempt_and_abort_list);
3048
3049 spin_lock(&dev->dev_reservation_lock);
3050 pr_res_holder = dev->dev_pr_res_holder;
3051 if (pr_res_holder &&
3052 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3053 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3054 all_reg = 1;
3055
3056 if (!all_reg && !sa_res_key) {
3057 spin_unlock(&dev->dev_reservation_lock);
3058 core_scsi3_put_pr_reg(pr_reg_n);
3059 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3060 return -EINVAL;
3061 }
3062 /*
3063 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3064 *
3065 * If the SERVICE ACTION RESERVATION KEY field does not identify a
3066 * persistent reservation holder or there is no persistent reservation
3067 * holder (i.e., there is no persistent reservation), then the device
3068 * server shall perform a preempt by doing the following in an
3069 * uninterrupted series of actions. (See below..)
3070 */
3071 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3072 /*
3073 * No existing or SA Reservation Key matching reservations..
3074 *
3075 * PROUT SA PREEMPT with All Registrant type reservations are
3076 * allowed to be processed without a matching SA Reservation Key
3077 */
3078 spin_lock(&pr_tmpl->registration_lock);
3079 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3080 &pr_tmpl->registration_list, pr_reg_list) {
3081 /*
3082 * Removing of registrations in non all registrants
3083 * type reservations without a matching SA reservation
3084 * key.
3085 *
3086 * a) Remove the registrations for all I_T nexuses
3087 * specified by the SERVICE ACTION RESERVATION KEY
3088 * field;
3089 * b) Ignore the contents of the SCOPE and TYPE fields;
3090 * c) Process tasks as defined in 5.7.1; and
3091 * d) Establish a unit attention condition for the
3092 * initiator port associated with every I_T nexus
3093 * that lost its registration other than the I_T
3094 * nexus on which the PERSISTENT RESERVE OUT command
3095 * was received, with the additional sense code set
3096 * to REGISTRATIONS PREEMPTED.
3097 */
3098 if (!all_reg) {
3099 if (pr_reg->pr_res_key != sa_res_key)
3100 continue;
3101
3102 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3103 pr_reg_nacl = pr_reg->pr_reg_nacl;
3104 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3105 __core_scsi3_free_registration(dev, pr_reg,
3106 (abort) ? &preempt_and_abort_list :
3107 NULL, calling_it_nexus);
3108 released_regs++;
3109 } else {
3110 /*
3111 * Case for any existing all registrants type
3112 * reservation, follow logic in spc4r17 section
3113 * 5.7.11.4 Preempting, Table 52 and Figure 7.
3114 *
3115 * For a ZERO SA Reservation key, release
3116 * all other registrations and do an implict
3117 * release of active persistent reservation.
3118 *
3119 * For a non-ZERO SA Reservation key, only
3120 * release the matching reservation key from
3121 * registrations.
3122 */
3123 if ((sa_res_key) &&
3124 (pr_reg->pr_res_key != sa_res_key))
3125 continue;
3126
3127 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3128 if (calling_it_nexus)
3129 continue;
3130
3131 pr_reg_nacl = pr_reg->pr_reg_nacl;
3132 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3133 __core_scsi3_free_registration(dev, pr_reg,
3134 (abort) ? &preempt_and_abort_list :
3135 NULL, 0);
3136 released_regs++;
3137 }
3138 if (!calling_it_nexus)
3139 core_scsi3_ua_allocate(pr_reg_nacl,
3140 pr_res_mapped_lun, 0x2A,
3141 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3142 }
3143 spin_unlock(&pr_tmpl->registration_lock);
3144 /*
3145 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3146 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3147 * RESERVATION KEY field to a value that does not match any
3148 * registered reservation key, then the device server shall
3149 * complete the command with RESERVATION CONFLICT status.
3150 */
3151 if (!released_regs) {
3152 spin_unlock(&dev->dev_reservation_lock);
3153 core_scsi3_put_pr_reg(pr_reg_n);
3154 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3155 return -EINVAL;
3156 }
3157 /*
3158 * For an existing all registrants type reservation
3159 * with a zero SA rservation key, preempt the existing
3160 * reservation with the new PR type and scope.
3161 */
3162 if (pr_res_holder && all_reg && !(sa_res_key)) {
3163 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3164 (abort) ? &preempt_and_abort_list : NULL,
3165 type, scope, abort);
3166
3167 if (abort)
3168 core_scsi3_release_preempt_and_abort(
3169 &preempt_and_abort_list, pr_reg_n);
3170 }
3171 spin_unlock(&dev->dev_reservation_lock);
3172
3173 if (pr_tmpl->pr_aptpl_active) {
3174 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3175 &pr_reg_n->pr_aptpl_buf[0],
3176 pr_tmpl->pr_aptpl_buf_len);
3177 if (!ret)
3178 pr_debug("SPC-3 PR: Updated APTPL"
3179 " metadata for PREEMPT%s\n", (abort) ?
3180 "_AND_ABORT" : "");
3181 }
3182
3183 core_scsi3_put_pr_reg(pr_reg_n);
3184 core_scsi3_pr_generation(cmd->se_dev);
3185 return 0;
3186 }
3187 /*
3188 * The PREEMPTing SA reservation key matches that of the
3189 * existing persistent reservation, first, we check if
3190 * we are preempting our own reservation.
3191 * From spc4r17, section 5.7.11.4.3 Preempting
3192 * persistent reservations and registration handling
3193 *
3194 * If an all registrants persistent reservation is not
3195 * present, it is not an error for the persistent
3196 * reservation holder to preempt itself (i.e., a
3197 * PERSISTENT RESERVE OUT with a PREEMPT service action
3198 * or a PREEMPT AND ABORT service action with the
3199 * SERVICE ACTION RESERVATION KEY value equal to the
3200 * persistent reservation holder's reservation key that
3201 * is received from the persistent reservation holder).
3202 * In that case, the device server shall establish the
3203 * new persistent reservation and maintain the
3204 * registration.
3205 */
3206 prh_type = pr_res_holder->pr_res_type;
3207 prh_scope = pr_res_holder->pr_res_scope;
3208 /*
3209 * If the SERVICE ACTION RESERVATION KEY field identifies a
3210 * persistent reservation holder (see 5.7.10), the device
3211 * server shall perform a preempt by doing the following as
3212 * an uninterrupted series of actions:
3213 *
3214 * a) Release the persistent reservation for the holder
3215 * identified by the SERVICE ACTION RESERVATION KEY field;
3216 */
3217 if (pr_reg_n != pr_res_holder)
3218 __core_scsi3_complete_pro_release(dev,
3219 pr_res_holder->pr_reg_nacl,
3220 dev->dev_pr_res_holder, 0);
3221 /*
3222 * b) Remove the registrations for all I_T nexuses identified
3223 * by the SERVICE ACTION RESERVATION KEY field, except the
3224 * I_T nexus that is being used for the PERSISTENT RESERVE
3225 * OUT command. If an all registrants persistent reservation
3226 * is present and the SERVICE ACTION RESERVATION KEY field
3227 * is set to zero, then all registrations shall be removed
3228 * except for that of the I_T nexus that is being used for
3229 * the PERSISTENT RESERVE OUT command;
3230 */
3231 spin_lock(&pr_tmpl->registration_lock);
3232 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3233 &pr_tmpl->registration_list, pr_reg_list) {
3234
3235 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3236 if (calling_it_nexus)
3237 continue;
3238
3239 if (pr_reg->pr_res_key != sa_res_key)
3240 continue;
3241
3242 pr_reg_nacl = pr_reg->pr_reg_nacl;
3243 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3244 __core_scsi3_free_registration(dev, pr_reg,
3245 (abort) ? &preempt_and_abort_list : NULL,
3246 calling_it_nexus);
3247 /*
3248 * e) Establish a unit attention condition for the initiator
3249 * port associated with every I_T nexus that lost its
3250 * persistent reservation and/or registration, with the
3251 * additional sense code set to REGISTRATIONS PREEMPTED;
3252 */
3253 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3254 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3255 }
3256 spin_unlock(&pr_tmpl->registration_lock);
3257 /*
3258 * c) Establish a persistent reservation for the preempting
3259 * I_T nexus using the contents of the SCOPE and TYPE fields;
3260 */
3261 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3262 (abort) ? &preempt_and_abort_list : NULL,
3263 type, scope, abort);
3264 /*
3265 * d) Process tasks as defined in 5.7.1;
3266 * e) See above..
3267 * f) If the type or scope has changed, then for every I_T nexus
3268 * whose reservation key was not removed, except for the I_T
3269 * nexus on which the PERSISTENT RESERVE OUT command was
3270 * received, the device server shall establish a unit
3271 * attention condition for the initiator port associated with
3272 * that I_T nexus, with the additional sense code set to
3273 * RESERVATIONS RELEASED. If the type or scope have not
3274 * changed, then no unit attention condition(s) shall be
3275 * established for this reason.
3276 */
3277 if ((prh_type != type) || (prh_scope != scope)) {
3278 spin_lock(&pr_tmpl->registration_lock);
3279 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3280 &pr_tmpl->registration_list, pr_reg_list) {
3281
3282 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3283 if (calling_it_nexus)
3284 continue;
3285
3286 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3287 pr_reg->pr_res_mapped_lun, 0x2A,
3288 ASCQ_2AH_RESERVATIONS_RELEASED);
3289 }
3290 spin_unlock(&pr_tmpl->registration_lock);
3291 }
3292 spin_unlock(&dev->dev_reservation_lock);
3293 /*
3294 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3295 * All received CDBs for the matching existing reservation and
3296 * registrations undergo ABORT_TASK logic.
3297 *
3298 * From there, core_scsi3_release_preempt_and_abort() will
3299 * release every registration in the list (which have already
3300 * been removed from the primary pr_reg list), except the
3301 * new persistent reservation holder, the calling Initiator Port.
3302 */
3303 if (abort) {
3304 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3305 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3306 pr_reg_n);
3307 }
3308
3309 if (pr_tmpl->pr_aptpl_active) {
3310 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3311 &pr_reg_n->pr_aptpl_buf[0],
3312 pr_tmpl->pr_aptpl_buf_len);
3313 if (!ret)
3314 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3315 "%s\n", (abort) ? "_AND_ABORT" : "");
3316 }
3317
3318 core_scsi3_put_pr_reg(pr_reg_n);
3319 core_scsi3_pr_generation(cmd->se_dev);
3320 return 0;
3321 }
3322
3323 static int core_scsi3_emulate_pro_preempt(
3324 struct se_cmd *cmd,
3325 int type,
3326 int scope,
3327 u64 res_key,
3328 u64 sa_res_key,
3329 int abort)
3330 {
3331 int ret = 0;
3332
3333 switch (type) {
3334 case PR_TYPE_WRITE_EXCLUSIVE:
3335 case PR_TYPE_EXCLUSIVE_ACCESS:
3336 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3338 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3339 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3340 ret = core_scsi3_pro_preempt(cmd, type, scope,
3341 res_key, sa_res_key, abort);
3342 break;
3343 default:
3344 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3345 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3346 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3347 return -EINVAL;
3348 }
3349
3350 return ret;
3351 }
3352
3353
3354 static int core_scsi3_emulate_pro_register_and_move(
3355 struct se_cmd *cmd,
3356 u64 res_key,
3357 u64 sa_res_key,
3358 int aptpl,
3359 int unreg)
3360 {
3361 struct se_session *se_sess = cmd->se_sess;
3362 struct se_device *dev = cmd->se_dev;
3363 struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3364 struct se_lun *se_lun = cmd->se_lun;
3365 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3366 struct se_port *se_port;
3367 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3368 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3369 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3370 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3371 unsigned char *buf;
3372 unsigned char *initiator_str;
3373 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3374 u32 tid_len, tmp_tid_len;
3375 int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3376 unsigned short rtpi;
3377 unsigned char proto_ident;
3378
3379 if (!se_sess || !se_lun) {
3380 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3381 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3382 return -EINVAL;
3383 }
3384 memset(dest_iport, 0, 64);
3385 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3386 se_tpg = se_sess->se_tpg;
3387 tf_ops = se_tpg->se_tpg_tfo;
3388 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3389 /*
3390 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3391 * Register behaviors for a REGISTER AND MOVE service action
3392 *
3393 * Locate the existing *pr_reg via struct se_node_acl pointers
3394 */
3395 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3396 se_sess);
3397 if (!pr_reg) {
3398 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3399 " *pr_reg for REGISTER_AND_MOVE\n");
3400 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3401 return -EINVAL;
3402 }
3403 /*
3404 * The provided reservation key much match the existing reservation key
3405 * provided during this initiator's I_T nexus registration.
3406 */
3407 if (res_key != pr_reg->pr_res_key) {
3408 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3409 " res_key: 0x%016Lx does not match existing SA REGISTER"
3410 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3411 core_scsi3_put_pr_reg(pr_reg);
3412 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3413 return -EINVAL;
3414 }
3415 /*
3416 * The service active reservation key needs to be non zero
3417 */
3418 if (!sa_res_key) {
3419 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3420 " sa_res_key\n");
3421 core_scsi3_put_pr_reg(pr_reg);
3422 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3423 return -EINVAL;
3424 }
3425
3426 /*
3427 * Determine the Relative Target Port Identifier where the reservation
3428 * will be moved to for the TransportID containing SCSI initiator WWN
3429 * information.
3430 */
3431 buf = transport_kmap_first_data_page(cmd);
3432 rtpi = (buf[18] & 0xff) << 8;
3433 rtpi |= buf[19] & 0xff;
3434 tid_len = (buf[20] & 0xff) << 24;
3435 tid_len |= (buf[21] & 0xff) << 16;
3436 tid_len |= (buf[22] & 0xff) << 8;
3437 tid_len |= buf[23] & 0xff;
3438 transport_kunmap_first_data_page(cmd);
3439 buf = NULL;
3440
3441 if ((tid_len + 24) != cmd->data_length) {
3442 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3443 " does not equal CDB data_length: %u\n", tid_len,
3444 cmd->data_length);
3445 core_scsi3_put_pr_reg(pr_reg);
3446 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3447 return -EINVAL;
3448 }
3449
3450 spin_lock(&dev->se_port_lock);
3451 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3452 if (se_port->sep_rtpi != rtpi)
3453 continue;
3454 dest_se_tpg = se_port->sep_tpg;
3455 if (!dest_se_tpg)
3456 continue;
3457 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3458 if (!dest_tf_ops)
3459 continue;
3460
3461 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3462 smp_mb__after_atomic_inc();
3463 spin_unlock(&dev->se_port_lock);
3464
3465 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3466 if (ret != 0) {
3467 pr_err("core_scsi3_tpg_depend_item() failed"
3468 " for dest_se_tpg\n");
3469 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3470 smp_mb__after_atomic_dec();
3471 core_scsi3_put_pr_reg(pr_reg);
3472 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3473 return -EINVAL;
3474 }
3475
3476 spin_lock(&dev->se_port_lock);
3477 break;
3478 }
3479 spin_unlock(&dev->se_port_lock);
3480
3481 if (!dest_se_tpg || !dest_tf_ops) {
3482 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3483 " fabric ops from Relative Target Port Identifier:"
3484 " %hu\n", rtpi);
3485 core_scsi3_put_pr_reg(pr_reg);
3486 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3487 return -EINVAL;
3488 }
3489
3490 buf = transport_kmap_first_data_page(cmd);
3491 proto_ident = (buf[24] & 0x0f);
3492 #if 0
3493 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3494 " 0x%02x\n", proto_ident);
3495 #endif
3496 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3497 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3498 " proto_ident: 0x%02x does not match ident: 0x%02x"
3499 " from fabric: %s\n", proto_ident,
3500 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3501 dest_tf_ops->get_fabric_name());
3502 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3503 ret = -EINVAL;
3504 goto out;
3505 }
3506 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3507 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3508 " containg a valid tpg_parse_pr_out_transport_id"
3509 " function pointer\n");
3510 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3511 ret = -EINVAL;
3512 goto out;
3513 }
3514 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3515 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3516 if (!initiator_str) {
3517 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3518 " initiator_str from Transport ID\n");
3519 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3520 ret = -EINVAL;
3521 goto out;
3522 }
3523
3524 transport_kunmap_first_data_page(cmd);
3525 buf = NULL;
3526
3527 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3528 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3529 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3530 iport_ptr : "");
3531 /*
3532 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3533 * action specifies a TransportID that is the same as the initiator port
3534 * of the I_T nexus for the command received, then the command shall
3535 * be terminated with CHECK CONDITION status, with the sense key set to
3536 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3537 * IN PARAMETER LIST.
3538 */
3539 pr_reg_nacl = pr_reg->pr_reg_nacl;
3540 matching_iname = (!strcmp(initiator_str,
3541 pr_reg_nacl->initiatorname)) ? 1 : 0;
3542 if (!matching_iname)
3543 goto after_iport_check;
3544
3545 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3546 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3547 " matches: %s on received I_T Nexus\n", initiator_str,
3548 pr_reg_nacl->initiatorname);
3549 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3550 ret = -EINVAL;
3551 goto out;
3552 }
3553 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3554 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3555 " matches: %s %s on received I_T Nexus\n",
3556 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3557 pr_reg->pr_reg_isid);
3558 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3559 ret = -EINVAL;
3560 goto out;
3561 }
3562 after_iport_check:
3563 /*
3564 * Locate the destination struct se_node_acl from the received Transport ID
3565 */
3566 spin_lock_irq(&dest_se_tpg->acl_node_lock);
3567 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3568 initiator_str);
3569 if (dest_node_acl) {
3570 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3571 smp_mb__after_atomic_inc();
3572 }
3573 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3574
3575 if (!dest_node_acl) {
3576 pr_err("Unable to locate %s dest_node_acl for"
3577 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3578 initiator_str);
3579 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3580 ret = -EINVAL;
3581 goto out;
3582 }
3583 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3584 if (ret != 0) {
3585 pr_err("core_scsi3_nodeacl_depend_item() for"
3586 " dest_node_acl\n");
3587 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3588 smp_mb__after_atomic_dec();
3589 dest_node_acl = NULL;
3590 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3591 ret = -EINVAL;
3592 goto out;
3593 }
3594 #if 0
3595 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3596 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3597 dest_node_acl->initiatorname);
3598 #endif
3599 /*
3600 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3601 * PORT IDENTIFIER.
3602 */
3603 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3604 if (!dest_se_deve) {
3605 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3606 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3607 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3608 ret = -EINVAL;
3609 goto out;
3610 }
3611
3612 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3613 if (ret < 0) {
3614 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3615 atomic_dec(&dest_se_deve->pr_ref_count);
3616 smp_mb__after_atomic_dec();
3617 dest_se_deve = NULL;
3618 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3619 ret = -EINVAL;
3620 goto out;
3621 }
3622 #if 0
3623 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3624 " ACL for dest_se_deve->mapped_lun: %u\n",
3625 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3626 dest_se_deve->mapped_lun);
3627 #endif
3628 /*
3629 * A persistent reservation needs to already existing in order to
3630 * successfully complete the REGISTER_AND_MOVE service action..
3631 */
3632 spin_lock(&dev->dev_reservation_lock);
3633 pr_res_holder = dev->dev_pr_res_holder;
3634 if (!pr_res_holder) {
3635 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3636 " currently held\n");
3637 spin_unlock(&dev->dev_reservation_lock);
3638 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3639 ret = -EINVAL;
3640 goto out;
3641 }
3642 /*
3643 * The received on I_T Nexus must be the reservation holder.
3644 *
3645 * From spc4r17 section 5.7.8 Table 50 --
3646 * Register behaviors for a REGISTER AND MOVE service action
3647 */
3648 if (pr_res_holder != pr_reg) {
3649 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3650 " Nexus is not reservation holder\n");
3651 spin_unlock(&dev->dev_reservation_lock);
3652 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3653 ret = -EINVAL;
3654 goto out;
3655 }
3656 /*
3657 * From spc4r17 section 5.7.8: registering and moving reservation
3658 *
3659 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3660 * action is received and the established persistent reservation is a
3661 * Write Exclusive - All Registrants type or Exclusive Access -
3662 * All Registrants type reservation, then the command shall be completed
3663 * with RESERVATION CONFLICT status.
3664 */
3665 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3666 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3667 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3668 " reservation for type: %s\n",
3669 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3670 spin_unlock(&dev->dev_reservation_lock);
3671 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3672 ret = -EINVAL;
3673 goto out;
3674 }
3675 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3676 /*
3677 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3678 */
3679 type = pr_res_holder->pr_res_type;
3680 scope = pr_res_holder->pr_res_type;
3681 /*
3682 * c) Associate the reservation key specified in the SERVICE ACTION
3683 * RESERVATION KEY field with the I_T nexus specified as the
3684 * destination of the register and move, where:
3685 * A) The I_T nexus is specified by the TransportID and the
3686 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3687 * B) Regardless of the TransportID format used, the association for
3688 * the initiator port is based on either the initiator port name
3689 * (see 3.1.71) on SCSI transport protocols where port names are
3690 * required or the initiator port identifier (see 3.1.70) on SCSI
3691 * transport protocols where port names are not required;
3692 * d) Register the reservation key specified in the SERVICE ACTION
3693 * RESERVATION KEY field;
3694 * e) Retain the reservation key specified in the SERVICE ACTION
3695 * RESERVATION KEY field and associated information;
3696 *
3697 * Also, It is not an error for a REGISTER AND MOVE service action to
3698 * register an I_T nexus that is already registered with the same
3699 * reservation key or a different reservation key.
3700 */
3701 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3702 iport_ptr);
3703 if (!dest_pr_reg) {
3704 ret = core_scsi3_alloc_registration(cmd->se_dev,
3705 dest_node_acl, dest_se_deve, iport_ptr,
3706 sa_res_key, 0, aptpl, 2, 1);
3707 if (ret != 0) {
3708 spin_unlock(&dev->dev_reservation_lock);
3709 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3710 ret = -EINVAL;
3711 goto out;
3712 }
3713 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3714 iport_ptr);
3715 new_reg = 1;
3716 }
3717 /*
3718 * f) Release the persistent reservation for the persistent reservation
3719 * holder (i.e., the I_T nexus on which the
3720 */
3721 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3722 dev->dev_pr_res_holder, 0);
3723 /*
3724 * g) Move the persistent reservation to the specified I_T nexus using
3725 * the same scope and type as the persistent reservation released in
3726 * item f); and
3727 */
3728 dev->dev_pr_res_holder = dest_pr_reg;
3729 dest_pr_reg->pr_res_holder = 1;
3730 dest_pr_reg->pr_res_type = type;
3731 pr_reg->pr_res_scope = scope;
3732 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3733 PR_REG_ISID_ID_LEN);
3734 /*
3735 * Increment PRGeneration for existing registrations..
3736 */
3737 if (!new_reg)
3738 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3739 spin_unlock(&dev->dev_reservation_lock);
3740
3741 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3742 " created new reservation holder TYPE: %s on object RTPI:"
3743 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3744 core_scsi3_pr_dump_type(type), rtpi,
3745 dest_pr_reg->pr_res_generation);
3746 pr_debug("SPC-3 PR Successfully moved reservation from"
3747 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3748 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3749 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3750 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3751 iport_ptr : "");
3752 /*
3753 * It is now safe to release configfs group dependencies for destination
3754 * of Transport ID Initiator Device/Port Identifier
3755 */
3756 core_scsi3_lunacl_undepend_item(dest_se_deve);
3757 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3758 core_scsi3_tpg_undepend_item(dest_se_tpg);
3759 /*
3760 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3761 * nexus on which PERSISTENT RESERVE OUT command was received.
3762 */
3763 if (unreg) {
3764 spin_lock(&pr_tmpl->registration_lock);
3765 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3766 spin_unlock(&pr_tmpl->registration_lock);
3767 } else
3768 core_scsi3_put_pr_reg(pr_reg);
3769
3770 /*
3771 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3772 * write out the updated metadata to struct file for this SCSI device.
3773 */
3774 if (!aptpl) {
3775 pr_tmpl->pr_aptpl_active = 0;
3776 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3777 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3778 " REGISTER_AND_MOVE\n");
3779 } else {
3780 pr_tmpl->pr_aptpl_active = 1;
3781 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3782 &dest_pr_reg->pr_aptpl_buf[0],
3783 pr_tmpl->pr_aptpl_buf_len);
3784 if (!ret)
3785 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3786 " REGISTER_AND_MOVE\n");
3787 }
3788
3789 transport_kunmap_first_data_page(cmd);
3790
3791 core_scsi3_put_pr_reg(dest_pr_reg);
3792 return 0;
3793 out:
3794 if (buf)
3795 transport_kunmap_first_data_page(cmd);
3796 if (dest_se_deve)
3797 core_scsi3_lunacl_undepend_item(dest_se_deve);
3798 if (dest_node_acl)
3799 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3800 core_scsi3_tpg_undepend_item(dest_se_tpg);
3801 core_scsi3_put_pr_reg(pr_reg);
3802 return ret;
3803 }
3804
3805 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3806 {
3807 unsigned int __v1, __v2;
3808
3809 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3810 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3811
3812 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3813 }
3814
3815 /*
3816 * See spc4r17 section 6.14 Table 170
3817 */
3818 int target_scsi3_emulate_pr_out(struct se_task *task)
3819 {
3820 struct se_cmd *cmd = task->task_se_cmd;
3821 unsigned char *cdb = &cmd->t_task_cdb[0];
3822 unsigned char *buf;
3823 u64 res_key, sa_res_key;
3824 int sa, scope, type, aptpl;
3825 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3826 int ret;
3827
3828 /*
3829 * Following spc2r20 5.5.1 Reservations overview:
3830 *
3831 * If a logical unit has been reserved by any RESERVE command and is
3832 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3833 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3834 * initiator or service action and shall terminate with a RESERVATION
3835 * CONFLICT status.
3836 */
3837 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
3838 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3839 " SPC-2 reservation is held, returning"
3840 " RESERVATION_CONFLICT\n");
3841 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3842 ret = EINVAL;
3843 goto out;
3844 }
3845
3846 /*
3847 * FIXME: A NULL struct se_session pointer means an this is not coming from
3848 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3849 */
3850 if (!cmd->se_sess) {
3851 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3852 return -EINVAL;
3853 }
3854
3855 if (cmd->data_length < 24) {
3856 pr_warn("SPC-PR: Received PR OUT parameter list"
3857 " length too small: %u\n", cmd->data_length);
3858 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3859 ret = -EINVAL;
3860 goto out;
3861 }
3862 /*
3863 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3864 */
3865 sa = (cdb[1] & 0x1f);
3866 scope = (cdb[2] & 0xf0);
3867 type = (cdb[2] & 0x0f);
3868
3869 buf = transport_kmap_first_data_page(cmd);
3870 /*
3871 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3872 */
3873 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3874 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3875 /*
3876 * REGISTER_AND_MOVE uses a different SA parameter list containing
3877 * SCSI TransportIDs.
3878 */
3879 if (sa != PRO_REGISTER_AND_MOVE) {
3880 spec_i_pt = (buf[20] & 0x08);
3881 all_tg_pt = (buf[20] & 0x04);
3882 aptpl = (buf[20] & 0x01);
3883 } else {
3884 aptpl = (buf[17] & 0x01);
3885 unreg = (buf[17] & 0x02);
3886 }
3887 transport_kunmap_first_data_page(cmd);
3888 buf = NULL;
3889
3890 /*
3891 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3892 */
3893 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
3894 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3895 ret = -EINVAL;
3896 goto out;
3897 }
3898
3899 /*
3900 * From spc4r17 section 6.14:
3901 *
3902 * If the SPEC_I_PT bit is set to zero, the service action is not
3903 * REGISTER AND MOVE, and the parameter list length is not 24, then
3904 * the command shall be terminated with CHECK CONDITION status, with
3905 * the sense key set to ILLEGAL REQUEST, and the additional sense
3906 * code set to PARAMETER LIST LENGTH ERROR.
3907 */
3908 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3909 (cmd->data_length != 24)) {
3910 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3911 " list length: %u\n", cmd->data_length);
3912 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3913 ret = -EINVAL;
3914 goto out;
3915 }
3916 /*
3917 * (core_scsi3_emulate_pro_* function parameters
3918 * are defined by spc4r17 Table 174:
3919 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3920 */
3921 switch (sa) {
3922 case PRO_REGISTER:
3923 ret = core_scsi3_emulate_pro_register(cmd,
3924 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3925 break;
3926 case PRO_RESERVE:
3927 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3928 break;
3929 case PRO_RELEASE:
3930 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3931 break;
3932 case PRO_CLEAR:
3933 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3934 break;
3935 case PRO_PREEMPT:
3936 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3937 res_key, sa_res_key, 0);
3938 break;
3939 case PRO_PREEMPT_AND_ABORT:
3940 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3941 res_key, sa_res_key, 1);
3942 break;
3943 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3944 ret = core_scsi3_emulate_pro_register(cmd,
3945 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3946 break;
3947 case PRO_REGISTER_AND_MOVE:
3948 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3949 sa_res_key, aptpl, unreg);
3950 break;
3951 default:
3952 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3953 " action: 0x%02x\n", cdb[1] & 0x1f);
3954 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3955 ret = -EINVAL;
3956 break;
3957 }
3958
3959 out:
3960 if (!ret) {
3961 task->task_scsi_status = GOOD;
3962 transport_complete_task(task, 1);
3963 }
3964 return ret;
3965 }
3966
3967 /*
3968 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3969 *
3970 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3971 */
3972 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3973 {
3974 struct se_device *se_dev = cmd->se_dev;
3975 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3976 struct t10_pr_registration *pr_reg;
3977 unsigned char *buf;
3978 u32 add_len = 0, off = 8;
3979
3980 if (cmd->data_length < 8) {
3981 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3982 " too small\n", cmd->data_length);
3983 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3984 return -EINVAL;
3985 }
3986
3987 buf = transport_kmap_first_data_page(cmd);
3988 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3989 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3990 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3991 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3992
3993 spin_lock(&su_dev->t10_pr.registration_lock);
3994 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3995 pr_reg_list) {
3996 /*
3997 * Check for overflow of 8byte PRI READ_KEYS payload and
3998 * next reservation key list descriptor.
3999 */
4000 if ((add_len + 8) > (cmd->data_length - 8))
4001 break;
4002
4003 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4004 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4005 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4006 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4007 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4008 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4009 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4010 buf[off++] = (pr_reg->pr_res_key & 0xff);
4011
4012 add_len += 8;
4013 }
4014 spin_unlock(&su_dev->t10_pr.registration_lock);
4015
4016 buf[4] = ((add_len >> 24) & 0xff);
4017 buf[5] = ((add_len >> 16) & 0xff);
4018 buf[6] = ((add_len >> 8) & 0xff);
4019 buf[7] = (add_len & 0xff);
4020
4021 transport_kunmap_first_data_page(cmd);
4022
4023 return 0;
4024 }
4025
4026 /*
4027 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
4028 *
4029 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
4030 */
4031 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
4032 {
4033 struct se_device *se_dev = cmd->se_dev;
4034 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4035 struct t10_pr_registration *pr_reg;
4036 unsigned char *buf;
4037 u64 pr_res_key;
4038 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
4039
4040 if (cmd->data_length < 8) {
4041 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
4042 " too small\n", cmd->data_length);
4043 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4044 return -EINVAL;
4045 }
4046
4047 buf = transport_kmap_first_data_page(cmd);
4048 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4049 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4050 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4051 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4052
4053 spin_lock(&se_dev->dev_reservation_lock);
4054 pr_reg = se_dev->dev_pr_res_holder;
4055 if ((pr_reg)) {
4056 /*
4057 * Set the hardcoded Additional Length
4058 */
4059 buf[4] = ((add_len >> 24) & 0xff);
4060 buf[5] = ((add_len >> 16) & 0xff);
4061 buf[6] = ((add_len >> 8) & 0xff);
4062 buf[7] = (add_len & 0xff);
4063
4064 if (cmd->data_length < 22)
4065 goto err;
4066
4067 /*
4068 * Set the Reservation key.
4069 *
4070 * From spc4r17, section 5.7.10:
4071 * A persistent reservation holder has its reservation key
4072 * returned in the parameter data from a PERSISTENT
4073 * RESERVE IN command with READ RESERVATION service action as
4074 * follows:
4075 * a) For a persistent reservation of the type Write Exclusive
4076 * - All Registrants or Exclusive Access ­ All Regitrants,
4077 * the reservation key shall be set to zero; or
4078 * b) For all other persistent reservation types, the
4079 * reservation key shall be set to the registered
4080 * reservation key for the I_T nexus that holds the
4081 * persistent reservation.
4082 */
4083 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
4084 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
4085 pr_res_key = 0;
4086 else
4087 pr_res_key = pr_reg->pr_res_key;
4088
4089 buf[8] = ((pr_res_key >> 56) & 0xff);
4090 buf[9] = ((pr_res_key >> 48) & 0xff);
4091 buf[10] = ((pr_res_key >> 40) & 0xff);
4092 buf[11] = ((pr_res_key >> 32) & 0xff);
4093 buf[12] = ((pr_res_key >> 24) & 0xff);
4094 buf[13] = ((pr_res_key >> 16) & 0xff);
4095 buf[14] = ((pr_res_key >> 8) & 0xff);
4096 buf[15] = (pr_res_key & 0xff);
4097 /*
4098 * Set the SCOPE and TYPE
4099 */
4100 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
4101 (pr_reg->pr_res_type & 0x0f);
4102 }
4103
4104 err:
4105 spin_unlock(&se_dev->dev_reservation_lock);
4106 transport_kunmap_first_data_page(cmd);
4107
4108 return 0;
4109 }
4110
4111 /*
4112 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
4113 *
4114 * See spc4r17 section 6.13.4 Table 165
4115 */
4116 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
4117 {
4118 struct se_device *dev = cmd->se_dev;
4119 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
4120 unsigned char *buf;
4121 u16 add_len = 8; /* Hardcoded to 8. */
4122
4123 if (cmd->data_length < 6) {
4124 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4125 " %u too small\n", cmd->data_length);
4126 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4127 return -EINVAL;
4128 }
4129
4130 buf = transport_kmap_first_data_page(cmd);
4131
4132 buf[0] = ((add_len << 8) & 0xff);
4133 buf[1] = (add_len & 0xff);
4134 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4135 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4136 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4137 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4138 /*
4139 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4140 * set the TMV: Task Mask Valid bit.
4141 */
4142 buf[3] |= 0x80;
4143 /*
4144 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4145 */
4146 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4147 /*
4148 * PTPL_A: Persistence across Target Power Loss Active bit
4149 */
4150 if (pr_tmpl->pr_aptpl_active)
4151 buf[3] |= 0x01;
4152 /*
4153 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4154 */
4155 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4156 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4157 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4158 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4159 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4160 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4161
4162 transport_kunmap_first_data_page(cmd);
4163
4164 return 0;
4165 }
4166
4167 /*
4168 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4169 *
4170 * See spc4r17 section 6.13.5 Table 168 and 169
4171 */
4172 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4173 {
4174 struct se_device *se_dev = cmd->se_dev;
4175 struct se_node_acl *se_nacl;
4176 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4177 struct se_portal_group *se_tpg;
4178 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4179 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4180 unsigned char *buf;
4181 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4182 u32 off = 8; /* off into first Full Status descriptor */
4183 int format_code = 0;
4184
4185 if (cmd->data_length < 8) {
4186 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4187 " too small\n", cmd->data_length);
4188 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4189 return -EINVAL;
4190 }
4191
4192 buf = transport_kmap_first_data_page(cmd);
4193
4194 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4195 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4196 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4197 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4198
4199 spin_lock(&pr_tmpl->registration_lock);
4200 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4201 &pr_tmpl->registration_list, pr_reg_list) {
4202
4203 se_nacl = pr_reg->pr_reg_nacl;
4204 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4205 add_desc_len = 0;
4206
4207 atomic_inc(&pr_reg->pr_res_holders);
4208 smp_mb__after_atomic_inc();
4209 spin_unlock(&pr_tmpl->registration_lock);
4210 /*
4211 * Determine expected length of $FABRIC_MOD specific
4212 * TransportID full status descriptor..
4213 */
4214 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4215 se_tpg, se_nacl, pr_reg, &format_code);
4216
4217 if ((exp_desc_len + add_len) > cmd->data_length) {
4218 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4219 " out of buffer: %d\n", cmd->data_length);
4220 spin_lock(&pr_tmpl->registration_lock);
4221 atomic_dec(&pr_reg->pr_res_holders);
4222 smp_mb__after_atomic_dec();
4223 break;
4224 }
4225 /*
4226 * Set RESERVATION KEY
4227 */
4228 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4229 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4230 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4231 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4232 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4233 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4234 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4235 buf[off++] = (pr_reg->pr_res_key & 0xff);
4236 off += 4; /* Skip Over Reserved area */
4237
4238 /*
4239 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4240 */
4241 if (pr_reg->pr_reg_all_tg_pt)
4242 buf[off] = 0x02;
4243 /*
4244 * The struct se_lun pointer will be present for the
4245 * reservation holder for PR_HOLDER bit.
4246 *
4247 * Also, if this registration is the reservation
4248 * holder, fill in SCOPE and TYPE in the next byte.
4249 */
4250 if (pr_reg->pr_res_holder) {
4251 buf[off++] |= 0x01;
4252 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4253 (pr_reg->pr_res_type & 0x0f);
4254 } else
4255 off += 2;
4256
4257 off += 4; /* Skip over reserved area */
4258 /*
4259 * From spc4r17 6.3.15:
4260 *
4261 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4262 * IDENTIFIER field contains the relative port identifier (see
4263 * 3.1.120) of the target port that is part of the I_T nexus
4264 * described by this full status descriptor. If the ALL_TG_PT
4265 * bit is set to one, the contents of the RELATIVE TARGET PORT
4266 * IDENTIFIER field are not defined by this standard.
4267 */
4268 if (!pr_reg->pr_reg_all_tg_pt) {
4269 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4270
4271 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4272 buf[off++] = (port->sep_rtpi & 0xff);
4273 } else
4274 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4275
4276 /*
4277 * Now, have the $FABRIC_MOD fill in the protocol identifier
4278 */
4279 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4280 se_nacl, pr_reg, &format_code, &buf[off+4]);
4281
4282 spin_lock(&pr_tmpl->registration_lock);
4283 atomic_dec(&pr_reg->pr_res_holders);
4284 smp_mb__after_atomic_dec();
4285 /*
4286 * Set the ADDITIONAL DESCRIPTOR LENGTH
4287 */
4288 buf[off++] = ((desc_len >> 24) & 0xff);
4289 buf[off++] = ((desc_len >> 16) & 0xff);
4290 buf[off++] = ((desc_len >> 8) & 0xff);
4291 buf[off++] = (desc_len & 0xff);
4292 /*
4293 * Size of full desctipor header minus TransportID
4294 * containing $FABRIC_MOD specific) initiator device/port
4295 * WWN information.
4296 *
4297 * See spc4r17 Section 6.13.5 Table 169
4298 */
4299 add_desc_len = (24 + desc_len);
4300
4301 off += desc_len;
4302 add_len += add_desc_len;
4303 }
4304 spin_unlock(&pr_tmpl->registration_lock);
4305 /*
4306 * Set ADDITIONAL_LENGTH
4307 */
4308 buf[4] = ((add_len >> 24) & 0xff);
4309 buf[5] = ((add_len >> 16) & 0xff);
4310 buf[6] = ((add_len >> 8) & 0xff);
4311 buf[7] = (add_len & 0xff);
4312
4313 transport_kunmap_first_data_page(cmd);
4314
4315 return 0;
4316 }
4317
4318 int target_scsi3_emulate_pr_in(struct se_task *task)
4319 {
4320 struct se_cmd *cmd = task->task_se_cmd;
4321 int ret;
4322
4323 /*
4324 * Following spc2r20 5.5.1 Reservations overview:
4325 *
4326 * If a logical unit has been reserved by any RESERVE command and is
4327 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4328 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4329 * initiator or service action and shall terminate with a RESERVATION
4330 * CONFLICT status.
4331 */
4332 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
4333 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4334 " SPC-2 reservation is held, returning"
4335 " RESERVATION_CONFLICT\n");
4336 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
4337 return -EINVAL;
4338 }
4339
4340 switch (cmd->t_task_cdb[1] & 0x1f) {
4341 case PRI_READ_KEYS:
4342 ret = core_scsi3_pri_read_keys(cmd);
4343 break;
4344 case PRI_READ_RESERVATION:
4345 ret = core_scsi3_pri_read_reservation(cmd);
4346 break;
4347 case PRI_REPORT_CAPABILITIES:
4348 ret = core_scsi3_pri_report_capabilities(cmd);
4349 break;
4350 case PRI_READ_FULL_STATUS:
4351 ret = core_scsi3_pri_read_full_status(cmd);
4352 break;
4353 default:
4354 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4355 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4356 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4357 ret = -EINVAL;
4358 break;
4359 }
4360
4361 if (!ret) {
4362 task->task_scsi_status = GOOD;
4363 transport_complete_task(task, 1);
4364 }
4365 return ret;
4366 }
4367
4368 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4369 {
4370 return 0;
4371 }
4372
4373 static int core_pt_seq_non_holder(
4374 struct se_cmd *cmd,
4375 unsigned char *cdb,
4376 u32 pr_reg_type)
4377 {
4378 return 0;
4379 }
4380
4381 int core_setup_reservations(struct se_device *dev, int force_pt)
4382 {
4383 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4384 struct t10_reservation *rest = &su_dev->t10_pr;
4385 /*
4386 * If this device is from Target_Core_Mod/pSCSI, use the reservations
4387 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
4388 * cause a problem because libata and some SATA RAID HBAs appear
4389 * under Linux/SCSI, but to emulate reservations themselves.
4390 */
4391 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4392 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4393 rest->res_type = SPC_PASSTHROUGH;
4394 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4395 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4396 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4397 " emulation\n", dev->transport->name);
4398 return 0;
4399 }
4400 /*
4401 * If SPC-3 or above is reported by real or emulated struct se_device,
4402 * use emulated Persistent Reservations.
4403 */
4404 if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4405 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4406 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4407 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4408 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4409 " emulation\n", dev->transport->name);
4410 } else {
4411 rest->res_type = SPC2_RESERVATIONS;
4412 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4413 rest->pr_ops.t10_seq_non_holder =
4414 &core_scsi2_reservation_seq_non_holder;
4415 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4416 dev->transport->name);
4417 }
4418
4419 return 0;
4420 }