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staging: Remove logger and alarm-dev from android Makefile
[deliverable/linux.git] / drivers / target / target_core_pr.c
CommitLineData
c66ac9db
NB		 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 *
4c76251e 7 * (c) Copyright 2009-2013 Datera, Inc.
c66ac9db
NB		 8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
c66ac9db
NB		 27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/list.h>
0e9b10a9 30#include <linux/file.h>
c66ac9db
NB		 31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33#include <asm/unaligned.h>
34
35#include <target/target_core_base.h>
c4795fb2
CH		 36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
c66ac9db
NB		 38#include <target/target_core_configfs.h>
39
e26d99ae 40#include "target_core_internal.h"
c66ac9db
NB		 41#include "target_core_pr.h"
42#include "target_core_ua.h"
43
44/*
45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
46 */
47struct pr_transport_id_holder {
48 int dest_local_nexus;
49 struct t10_pr_registration *dest_pr_reg;
50 struct se_portal_group *dest_tpg;
51 struct se_node_acl *dest_node_acl;
52 struct se_dev_entry *dest_se_deve;
53 struct list_head dest_list;
54};
55
d2843c17 56void core_pr_dump_initiator_port(
c66ac9db
NB		 57 struct t10_pr_registration *pr_reg,
58 char *buf,
59 u32 size)
60{
6708bb27 61 if (!pr_reg->isid_present_at_reg)
d2843c17 62 buf[0] = '\0';
c66ac9db 63
d2843c17 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
c66ac9db
NB		 65}
66
33ce6a87
AG		 67enum register_type {
68 REGISTER,
69 REGISTER_AND_IGNORE_EXISTING_KEY,
70 REGISTER_AND_MOVE,
71};
72
73enum preempt_type {
74 PREEMPT,
75 PREEMPT_AND_ABORT,
76};
77
c66ac9db 78static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
6c3c9baa 79 struct t10_pr_registration *, int, int);
c66ac9db 80
de103c93
CH		 81static sense_reason_t
82target_scsi2_reservation_check(struct se_cmd *cmd)
c66ac9db 83{
d977f437
CH		 84 struct se_device *dev = cmd->se_dev;
85 struct se_session *sess = cmd->se_sess;
86
87 switch (cmd->t_task_cdb[0]) {
c66ac9db
NB		 88 case INQUIRY:
89 case RELEASE:
90 case RELEASE_10:
91 return 0;
92 default:
d977f437 93 break;
c66ac9db
NB		 94 }
95
d977f437 96 if (!dev->dev_reserved_node_acl || !sess)
c66ac9db
NB		 97 return 0;
98
d977f437 99 if (dev->dev_reserved_node_acl != sess->se_node_acl)
de103c93 100 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 101
102 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
103 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
de103c93 104 return TCM_RESERVATION_CONFLICT;
c66ac9db 105 }
c66ac9db 106
d977f437 107 return 0;
c66ac9db
NB		 108}
109
eacac00c
CH		 110static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
111 struct se_node_acl *, struct se_session *);
112static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
113
087a03b3 114static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
eacac00c
CH		 115{
116 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 117 struct se_device *dev = cmd->se_dev;
eacac00c 118 struct t10_pr_registration *pr_reg;
0fd97ccf 119 struct t10_reservation *pr_tmpl = &dev->t10_pr;
eacac00c
CH		 120 int conflict = 0;
121
eacac00c
CH		 122 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
123 se_sess);
124 if (pr_reg) {
125 /*
126 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
127 * behavior
128 *
129 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
130 * status, but no reservation shall be established and the
131 * persistent reservation shall not be changed, if the command
132 * is received from a) and b) below.
133 *
134 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
135 * status, but the persistent reservation shall not be released,
136 * if the command is received from a) and b)
137 *
138 * a) An I_T nexus that is a persistent reservation holder; or
139 * b) An I_T nexus that is registered if a registrants only or
140 * all registrants type persistent reservation is present.
141 *
142 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
143 * RELEASE(6) command, or RELEASE(10) command shall be processed
144 * as defined in SPC-2.
145 */
146 if (pr_reg->pr_res_holder) {
147 core_scsi3_put_pr_reg(pr_reg);
087a03b3 148 return 1;
eacac00c
CH		 149 }
150 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
151 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
152 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
153 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
154 core_scsi3_put_pr_reg(pr_reg);
087a03b3 155 return 1;
eacac00c
CH		 156 }
157 core_scsi3_put_pr_reg(pr_reg);
158 conflict = 1;
159 } else {
160 /*
161 * Following spc2r20 5.5.1 Reservations overview:
162 *
163 * If a logical unit has executed a PERSISTENT RESERVE OUT
164 * command with the REGISTER or the REGISTER AND IGNORE
165 * EXISTING KEY service action and is still registered by any
166 * initiator, all RESERVE commands and all RELEASE commands
167 * regardless of initiator shall conflict and shall terminate
168 * with a RESERVATION CONFLICT status.
169 */
170 spin_lock(&pr_tmpl->registration_lock);
171 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
172 spin_unlock(&pr_tmpl->registration_lock);
173 }
174
175 if (conflict) {
176 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
177 " while active SPC-3 registrations exist,"
178 " returning RESERVATION_CONFLICT\n");
087a03b3 179 return -EBUSY;
eacac00c
CH		 180 }
181
087a03b3 182 return 0;
eacac00c
CH		 183}
184
de103c93
CH		 185sense_reason_t
186target_scsi2_reservation_release(struct se_cmd *cmd)
c66ac9db
NB		 187{
188 struct se_device *dev = cmd->se_dev;
189 struct se_session *sess = cmd->se_sess;
609234e3 190 struct se_portal_group *tpg;
de103c93 191 int rc;
c66ac9db 192
609234e3 193 if (!sess || !sess->se_tpg)
d29a5b6a 194 goto out;
087a03b3
NB		 195 rc = target_check_scsi2_reservation_conflict(cmd);
196 if (rc == 1)
d29a5b6a 197 goto out;
de103c93
CH		 198 if (rc < 0)
199 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 200
201 spin_lock(&dev->dev_reservation_lock);
d29a5b6a
CH		 202 if (!dev->dev_reserved_node_acl || !sess)
203 goto out_unlock;
204
205 if (dev->dev_reserved_node_acl != sess->se_node_acl)
206 goto out_unlock;
c66ac9db 207
edc318d9
BK		 208 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
209 goto out_unlock;
210
c66ac9db 211 dev->dev_reserved_node_acl = NULL;
0fd97ccf
CH		 212 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
213 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
c66ac9db 214 dev->dev_res_bin_isid = 0;
0fd97ccf 215 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 216 }
609234e3 217 tpg = sess->se_tpg;
6708bb27 218 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
e3d6f909
AG		 219 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
220 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 221 sess->se_node_acl->initiatorname);
c66ac9db 222
d29a5b6a
CH		 223out_unlock:
224 spin_unlock(&dev->dev_reservation_lock);
225out:
de103c93
CH		 226 target_complete_cmd(cmd, GOOD);
227 return 0;
c66ac9db
NB		 228}
229
de103c93
CH		 230sense_reason_t
231target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 232{
233 struct se_device *dev = cmd->se_dev;
234 struct se_session *sess = cmd->se_sess;
609234e3 235 struct se_portal_group *tpg;
de103c93
CH		 236 sense_reason_t ret = 0;
237 int rc;
c66ac9db 238
a1d8b49a
AG		 239 if ((cmd->t_task_cdb[1] & 0x01) &&
240 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 241 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 242 " ILLEGAL_REQUEST\n");
de103c93 243 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 244 }
245 /*
246 * This is currently the case for target_core_mod passthrough struct se_cmd
247 * ops
248 */
609234e3 249 if (!sess || !sess->se_tpg)
d29a5b6a 250 goto out;
087a03b3
NB		 251 rc = target_check_scsi2_reservation_conflict(cmd);
252 if (rc == 1)
d29a5b6a 253 goto out;
c66ac9db 254
de103c93
CH		 255 if (rc < 0)
256 return TCM_RESERVATION_CONFLICT;
257
609234e3 258 tpg = sess->se_tpg;
c66ac9db
NB		 259 spin_lock(&dev->dev_reservation_lock);
260 if (dev->dev_reserved_node_acl &&
261 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 262 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 263 tpg->se_tpg_tfo->get_fabric_name());
6708bb27 264 pr_err("Original reserver LUN: %u %s\n",
e3d6f909 265 cmd->se_lun->unpacked_lun,
c66ac9db 266 dev->dev_reserved_node_acl->initiatorname);
6708bb27 267 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
e3d6f909 268 " from %s \n", cmd->se_lun->unpacked_lun,
c66ac9db
NB		 269 cmd->se_deve->mapped_lun,
270 sess->se_node_acl->initiatorname);
de103c93 271 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 272 goto out_unlock;
c66ac9db
NB		 273 }
274
275 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 276 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 277 if (sess->sess_bin_isid != 0) {
278 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 279 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 280 }
6708bb27 281 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
e3d6f909
AG		 282 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
283 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 284 sess->se_node_acl->initiatorname);
c66ac9db 285
d29a5b6a
CH		 286out_unlock:
287 spin_unlock(&dev->dev_reservation_lock);
288out:
6bb35e00
CH		 289 if (!ret)
290 target_complete_cmd(cmd, GOOD);
d29a5b6a 291 return ret;
c66ac9db
NB		 292}
293
c66ac9db
NB		 294
295/*
296 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
297 *
298 * This function is called by those initiator ports who are *NOT*
299 * the active PR reservation holder when a reservation is present.
300 */
301static int core_scsi3_pr_seq_non_holder(
302 struct se_cmd *cmd,
c66ac9db
NB		 303 u32 pr_reg_type)
304{
d977f437 305 unsigned char *cdb = cmd->t_task_cdb;
c66ac9db 306 struct se_dev_entry *se_deve;
e3d6f909 307 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 308 int other_cdb = 0, ignore_reg;
309 int registered_nexus = 0, ret = 1; /* Conflict by default */
310 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
311 int we = 0; /* Write Exclusive */
312 int legacy = 0; /* Act like a legacy device and return
313 * RESERVATION CONFLICT on some CDBs */
c66ac9db 314
f2083241 315 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 316 /*
317 * Determine if the registration should be ignored due to
d977f437 318 * non-matching ISIDs in target_scsi3_pr_reservation_check().
c66ac9db
NB		 319 */
320 ignore_reg = (pr_reg_type & 0x80000000);
321 if (ignore_reg)
322 pr_reg_type &= ~0x80000000;
323
324 switch (pr_reg_type) {
325 case PR_TYPE_WRITE_EXCLUSIVE:
326 we = 1;
327 case PR_TYPE_EXCLUSIVE_ACCESS:
328 /*
329 * Some commands are only allowed for the persistent reservation
330 * holder.
331 */
332 if ((se_deve->def_pr_registered) && !(ignore_reg))
333 registered_nexus = 1;
334 break;
335 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
336 we = 1;
337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
338 /*
339 * Some commands are only allowed for registered I_T Nexuses.
340 */
341 reg_only = 1;
342 if ((se_deve->def_pr_registered) && !(ignore_reg))
343 registered_nexus = 1;
344 break;
345 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
346 we = 1;
347 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
348 /*
349 * Each registered I_T Nexus is a reservation holder.
350 */
351 all_reg = 1;
352 if ((se_deve->def_pr_registered) && !(ignore_reg))
353 registered_nexus = 1;
354 break;
355 default:
e3d6f909 356 return -EINVAL;
c66ac9db
NB		 357 }
358 /*
359 * Referenced from spc4r17 table 45 for *NON* PR holder access
360 */
361 switch (cdb[0]) {
362 case SECURITY_PROTOCOL_IN:
363 if (registered_nexus)
364 return 0;
365 ret = (we) ? 0 : 1;
366 break;
367 case MODE_SENSE:
368 case MODE_SENSE_10:
369 case READ_ATTRIBUTE:
370 case READ_BUFFER:
371 case RECEIVE_DIAGNOSTIC:
372 if (legacy) {
373 ret = 1;
374 break;
375 }
376 if (registered_nexus) {
377 ret = 0;
378 break;
379 }
380 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
381 break;
382 case PERSISTENT_RESERVE_OUT:
383 /*
384 * This follows PERSISTENT_RESERVE_OUT service actions that
385 * are allowed in the presence of various reservations.
386 * See spc4r17, table 46
387 */
388 switch (cdb[1] & 0x1f) {
389 case PRO_CLEAR:
390 case PRO_PREEMPT:
391 case PRO_PREEMPT_AND_ABORT:
392 ret = (registered_nexus) ? 0 : 1;
393 break;
394 case PRO_REGISTER:
395 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
396 ret = 0;
397 break;
398 case PRO_REGISTER_AND_MOVE:
399 case PRO_RESERVE:
400 ret = 1;
401 break;
402 case PRO_RELEASE:
403 ret = (registered_nexus) ? 0 : 1;
404 break;
405 default:
6708bb27 406 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 407 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 408 return -EINVAL;
c66ac9db
NB		 409 }
410 break;
411 case RELEASE:
412 case RELEASE_10:
eacac00c 413 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 414 ret = 0;
415 break;
416 case RESERVE:
417 case RESERVE_10:
eacac00c 418 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 419 ret = 0;
420 break;
421 case TEST_UNIT_READY:
422 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
423 break;
424 case MAINTENANCE_IN:
425 switch (cdb[1] & 0x1f) {
426 case MI_MANAGEMENT_PROTOCOL_IN:
427 if (registered_nexus) {
428 ret = 0;
429 break;
430 }
431 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
432 break;
433 case MI_REPORT_SUPPORTED_OPERATION_CODES:
434 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
435 if (legacy) {
436 ret = 1;
437 break;
438 }
439 if (registered_nexus) {
440 ret = 0;
441 break;
442 }
443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
444 break;
445 case MI_REPORT_ALIASES:
446 case MI_REPORT_IDENTIFYING_INFORMATION:
447 case MI_REPORT_PRIORITY:
448 case MI_REPORT_TARGET_PGS:
449 case MI_REPORT_TIMESTAMP:
450 ret = 0; /* Allowed */
451 break;
452 default:
6708bb27 453 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 454 (cdb[1] & 0x1f));
e3d6f909 455 return -EINVAL;
c66ac9db
NB		 456 }
457 break;
458 case ACCESS_CONTROL_IN:
459 case ACCESS_CONTROL_OUT:
460 case INQUIRY:
461 case LOG_SENSE:
85686f69 462 case SERVICE_ACTION_IN_12:
c66ac9db
NB		 463 case REPORT_LUNS:
464 case REQUEST_SENSE:
6816966a 465 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 466 ret = 0; /*/ Allowed CDBs */
467 break;
468 default:
469 other_cdb = 1;
470 break;
471 }
472 /*
25985edc 473 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 474 * statement.
475 */
6708bb27 476 if (!ret && !other_cdb) {
125d0119 477 pr_debug("Allowing explicit CDB: 0x%02x for %s"
c66ac9db
NB		 478 " reservation holder\n", cdb[0],
479 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 480
c66ac9db
NB		 481 return ret;
482 }
483 /*
484 * Check if write exclusive initiator ports *NOT* holding the
485 * WRITE_EXCLUSIVE_* reservation.
486 */
ee1b1b9c 487 if (we && !registered_nexus) {
c66ac9db
NB		 488 if (cmd->data_direction == DMA_TO_DEVICE) {
489 /*
490 * Conflict for write exclusive
491 */
6708bb27 492 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 493 " %s CDB: 0x%02x to %s reservation\n",
494 transport_dump_cmd_direction(cmd),
495 se_sess->se_node_acl->initiatorname, cdb[0],
496 core_scsi3_pr_dump_type(pr_reg_type));
497 return 1;
498 } else {
499 /*
500 * Allow non WRITE CDBs for all Write Exclusive
501 * PR TYPEs to pass for registered and
502 * non-registered_nexuxes NOT holding the reservation.
503 *
504 * We only make noise for the unregisterd nexuses,
505 * as we expect registered non-reservation holding
506 * nexuses to issue CDBs.
507 */
8b1e1244 508
6708bb27 509 if (!registered_nexus) {
125d0119 510 pr_debug("Allowing implicit CDB: 0x%02x"
c66ac9db
NB		 511 " for %s reservation on unregistered"
512 " nexus\n", cdb[0],
513 core_scsi3_pr_dump_type(pr_reg_type));
514 }
8b1e1244 515
c66ac9db
NB		 516 return 0;
517 }
518 } else if ((reg_only) || (all_reg)) {
519 if (registered_nexus) {
520 /*
521 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
522 * allow commands from registered nexuses.
523 */
8b1e1244 524
125d0119 525 pr_debug("Allowing implicit CDB: 0x%02x for %s"
c66ac9db
NB		 526 " reservation\n", cdb[0],
527 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 528
c66ac9db
NB		 529 return 0;
530 }
1ecc7586
LD		 531 } else if (we && registered_nexus) {
532 /*
533 * Reads are allowed for Write Exclusive locks
534 * from all registrants.
535 */
536 if (cmd->data_direction == DMA_FROM_DEVICE) {
537 pr_debug("Allowing READ CDB: 0x%02x for %s"
538 " reservation\n", cdb[0],
539 core_scsi3_pr_dump_type(pr_reg_type));
540
541 return 0;
542 }
c66ac9db 543 }
6708bb27 544 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 545 " for %s reservation\n", transport_dump_cmd_direction(cmd),
546 (registered_nexus) ? "" : "un",
547 se_sess->se_node_acl->initiatorname, cdb[0],
548 core_scsi3_pr_dump_type(pr_reg_type));
549
550 return 1; /* Conflict by default */
551}
552
de103c93
CH		 553static sense_reason_t
554target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 555{
556 struct se_device *dev = cmd->se_dev;
557 struct se_session *sess = cmd->se_sess;
558 u32 pr_reg_type;
559
560 if (!dev->dev_pr_res_holder)
561 return 0;
562
563 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
564 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
565 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
566 goto check_nonholder;
567
568 if (dev->dev_pr_res_holder->isid_present_at_reg) {
569 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
570 sess->sess_bin_isid) {
571 pr_reg_type |= 0x80000000;
572 goto check_nonholder;
573 }
574 }
575
576 return 0;
577
578check_nonholder:
579 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
de103c93 580 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 581 return 0;
582}
583
c66ac9db
NB		 584static u32 core_scsi3_pr_generation(struct se_device *dev)
585{
c66ac9db 586 u32 prg;
0fd97ccf 587
c66ac9db
NB		 588 /*
589 * PRGeneration field shall contain the value of a 32-bit wrapping
590 * counter mainted by the device server.
591 *
592 * Note that this is done regardless of Active Persist across
593 * Target PowerLoss (APTPL)
594 *
595 * See spc4r17 section 6.3.12 READ_KEYS service action
596 */
597 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 598 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 599 spin_unlock(&dev->dev_reservation_lock);
600
601 return prg;
602}
603
c66ac9db
NB		 604static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
605 struct se_device *dev,
606 struct se_node_acl *nacl,
607 struct se_dev_entry *deve,
608 unsigned char *isid,
609 u64 sa_res_key,
610 int all_tg_pt,
611 int aptpl)
612{
c66ac9db
NB		 613 struct t10_pr_registration *pr_reg;
614
615 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 616 if (!pr_reg) {
617 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 618 return NULL;
619 }
620
c66ac9db
NB		 621 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
622 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
623 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
624 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
625 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
626 atomic_set(&pr_reg->pr_res_holders, 0);
627 pr_reg->pr_reg_nacl = nacl;
628 pr_reg->pr_reg_deve = deve;
629 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
630 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
631 pr_reg->pr_res_key = sa_res_key;
632 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
633 pr_reg->pr_reg_aptpl = aptpl;
634 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
635 /*
636 * If an ISID value for this SCSI Initiator Port exists,
637 * save it to the registration now.
638 */
639 if (isid != NULL) {
640 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
641 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
642 pr_reg->isid_present_at_reg = 1;
643 }
644
645 return pr_reg;
646}
647
648static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
649static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
650
651/*
652 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
653 * modes.
654 */
655static struct t10_pr_registration *__core_scsi3_alloc_registration(
656 struct se_device *dev,
657 struct se_node_acl *nacl,
658 struct se_dev_entry *deve,
659 unsigned char *isid,
660 u64 sa_res_key,
661 int all_tg_pt,
662 int aptpl)
663{
664 struct se_dev_entry *deve_tmp;
665 struct se_node_acl *nacl_tmp;
666 struct se_port *port, *port_tmp;
667 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
668 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
669 int ret;
670 /*
671 * Create a registration for the I_T Nexus upon which the
672 * PROUT REGISTER was received.
673 */
674 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
675 sa_res_key, all_tg_pt, aptpl);
6708bb27 676 if (!pr_reg)
c66ac9db
NB		 677 return NULL;
678 /*
679 * Return pointer to pr_reg for ALL_TG_PT=0
680 */
6708bb27 681 if (!all_tg_pt)
c66ac9db
NB		 682 return pr_reg;
683 /*
684 * Create list of matching SCSI Initiator Port registrations
685 * for ALL_TG_PT=1
686 */
687 spin_lock(&dev->se_port_lock);
688 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
33940d09 689 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 690 spin_unlock(&dev->se_port_lock);
691
692 spin_lock_bh(&port->sep_alua_lock);
693 list_for_each_entry(deve_tmp, &port->sep_alua_list,
694 alua_port_list) {
695 /*
696 * This pointer will be NULL for demo mode MappedLUNs
125d0119 697 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 698 * MappedLUN group for the SCSI Initiator Node ACL.
699 */
6708bb27 700 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 701 continue;
702
703 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
704 /*
705 * Skip the matching struct se_node_acl that is allocated
706 * above..
707 */
708 if (nacl == nacl_tmp)
709 continue;
710 /*
711 * Only perform PR registrations for target ports on
712 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
713 * arrived.
714 */
715 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
716 continue;
717 /*
718 * Look for a matching Initiator Node ACL in ASCII format
719 */
720 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
721 continue;
722
33940d09 723 atomic_inc_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 724 spin_unlock_bh(&port->sep_alua_lock);
725 /*
726 * Grab a configfs group dependency that is released
727 * for the exception path at label out: below, or upon
728 * completion of adding ALL_TG_PT=1 registrations in
729 * __core_scsi3_add_registration()
730 */
731 ret = core_scsi3_lunacl_depend_item(deve_tmp);
732 if (ret < 0) {
6708bb27 733 pr_err("core_scsi3_lunacl_depend"
c66ac9db 734 "_item() failed\n");
33940d09
JE		 735 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
736 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 737 goto out;
738 }
739 /*
740 * Located a matching SCSI Initiator Port on a different
741 * port, allocate the pr_reg_atp and attach it to the
742 * pr_reg->pr_reg_atp_list that will be processed once
743 * the original *pr_reg is processed in
744 * __core_scsi3_add_registration()
745 */
746 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
747 nacl_tmp, deve_tmp, NULL,
748 sa_res_key, all_tg_pt, aptpl);
6708bb27 749 if (!pr_reg_atp) {
33940d09
JE		 750 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
751 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 752 core_scsi3_lunacl_undepend_item(deve_tmp);
753 goto out;
754 }
755
756 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
757 &pr_reg->pr_reg_atp_list);
758 spin_lock_bh(&port->sep_alua_lock);
759 }
760 spin_unlock_bh(&port->sep_alua_lock);
761
762 spin_lock(&dev->se_port_lock);
33940d09 763 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 764 }
765 spin_unlock(&dev->se_port_lock);
766
767 return pr_reg;
768out:
769 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
770 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
771 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
772 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
773 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
774 }
775 kmem_cache_free(t10_pr_reg_cache, pr_reg);
776 return NULL;
777}
778
779int core_scsi3_alloc_aptpl_registration(
e3d6f909 780 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 781 u64 sa_res_key,
782 unsigned char *i_port,
783 unsigned char *isid,
784 u32 mapped_lun,
785 unsigned char *t_port,
786 u16 tpgt,
787 u32 target_lun,
788 int res_holder,
789 int all_tg_pt,
790 u8 type)
791{
792 struct t10_pr_registration *pr_reg;
793
6708bb27
AG		 794 if (!i_port || !t_port || !sa_res_key) {
795 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 796 return -EINVAL;
c66ac9db
NB		 797 }
798
799 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 800 if (!pr_reg) {
801 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 802 return -ENOMEM;
c66ac9db 803 }
c66ac9db
NB		 804
805 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
806 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
807 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
808 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
809 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
810 atomic_set(&pr_reg->pr_res_holders, 0);
811 pr_reg->pr_reg_nacl = NULL;
812 pr_reg->pr_reg_deve = NULL;
813 pr_reg->pr_res_mapped_lun = mapped_lun;
814 pr_reg->pr_aptpl_target_lun = target_lun;
815 pr_reg->pr_res_key = sa_res_key;
816 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
817 pr_reg->pr_reg_aptpl = 1;
818 pr_reg->pr_reg_tg_pt_lun = NULL;
819 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
820 pr_reg->pr_res_type = type;
821 /*
822 * If an ISID value had been saved in APTPL metadata for this
823 * SCSI Initiator Port, restore it now.
824 */
825 if (isid != NULL) {
826 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
827 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
828 pr_reg->isid_present_at_reg = 1;
829 }
830 /*
831 * Copy the i_port and t_port information from caller.
832 */
833 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
834 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
835 pr_reg->pr_reg_tpgt = tpgt;
836 /*
837 * Set pr_res_holder from caller, the pr_reg who is the reservation
838 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
839 * the Initiator Node LUN ACL from the fabric module is created for
840 * this registration.
841 */
842 pr_reg->pr_res_holder = res_holder;
843
844 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 845 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 846 " metadata\n", (res_holder) ? "+reservation" : "");
847 return 0;
848}
849
850static void core_scsi3_aptpl_reserve(
851 struct se_device *dev,
852 struct se_portal_group *tpg,
853 struct se_node_acl *node_acl,
854 struct t10_pr_registration *pr_reg)
855{
856 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 857
858 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 859 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 860
861 spin_lock(&dev->dev_reservation_lock);
862 dev->dev_pr_res_holder = pr_reg;
863 spin_unlock(&dev->dev_reservation_lock);
864
6708bb27 865 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 866 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 867 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 868 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
869 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 870 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 871 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 872 i_buf);
c66ac9db
NB		 873}
874
875static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 876 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 877
878static int __core_scsi3_check_aptpl_registration(
879 struct se_device *dev,
880 struct se_portal_group *tpg,
881 struct se_lun *lun,
882 u32 target_lun,
883 struct se_node_acl *nacl,
884 struct se_dev_entry *deve)
885{
886 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 887 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 888 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
889 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
890 u16 tpgt;
891
892 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
893 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
894 /*
895 * Copy Initiator Port information from struct se_node_acl
896 */
897 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
898 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 899 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
900 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 901 /*
902 * Look for the matching registrations+reservation from those
903 * created from APTPL metadata. Note that multiple registrations
904 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
905 * TransportIDs.
906 */
907 spin_lock(&pr_tmpl->aptpl_reg_lock);
908 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
909 pr_reg_aptpl_list) {
92404e60 910
6708bb27 911 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 912 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
913 !(strcmp(pr_reg->pr_tport, t_port)) &&
914 (pr_reg->pr_reg_tpgt == tpgt) &&
915 (pr_reg->pr_aptpl_target_lun == target_lun)) {
916
917 pr_reg->pr_reg_nacl = nacl;
918 pr_reg->pr_reg_deve = deve;
919 pr_reg->pr_reg_tg_pt_lun = lun;
920
921 list_del(&pr_reg->pr_reg_aptpl_list);
922 spin_unlock(&pr_tmpl->aptpl_reg_lock);
923 /*
924 * At this point all of the pointers in *pr_reg will
925 * be setup, so go ahead and add the registration.
926 */
927
928 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
929 /*
930 * If this registration is the reservation holder,
931 * make that happen now..
932 */
933 if (pr_reg->pr_res_holder)
934 core_scsi3_aptpl_reserve(dev, tpg,
935 nacl, pr_reg);
936 /*
937 * Reenable pr_aptpl_active to accept new metadata
938 * updates once the SCSI device is active again..
939 */
940 spin_lock(&pr_tmpl->aptpl_reg_lock);
941 pr_tmpl->pr_aptpl_active = 1;
942 }
943 }
944 spin_unlock(&pr_tmpl->aptpl_reg_lock);
945
946 return 0;
947}
948
949int core_scsi3_check_aptpl_registration(
950 struct se_device *dev,
951 struct se_portal_group *tpg,
952 struct se_lun *lun,
e2480563
NB		 953 struct se_node_acl *nacl,
954 u32 mapped_lun)
c66ac9db 955{
e2480563 956 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
c66ac9db 957
d977f437 958 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 959 return 0;
960
961 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
962 lun->unpacked_lun, nacl, deve);
963}
964
965static void __core_scsi3_dump_registration(
966 struct target_core_fabric_ops *tfo,
967 struct se_device *dev,
968 struct se_node_acl *nacl,
969 struct t10_pr_registration *pr_reg,
33ce6a87 970 enum register_type register_type)
c66ac9db
NB		 971{
972 struct se_portal_group *se_tpg = nacl->se_tpg;
973 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 974
975 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 976 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 977
6708bb27 978 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 979 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
980 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 981 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 982 i_buf);
6708bb27 983 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 984 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
985 tfo->tpg_get_tag(se_tpg));
6708bb27 986 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 987 " Port(s)\n", tfo->get_fabric_name(),
988 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 989 dev->transport->name);
6708bb27 990 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 991 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
992 pr_reg->pr_res_key, pr_reg->pr_res_generation,
993 pr_reg->pr_reg_aptpl);
994}
995
996/*
997 * this function can be called with struct se_device->dev_reservation_lock
998 * when register_move = 1
999 */
1000static void __core_scsi3_add_registration(
1001 struct se_device *dev,
1002 struct se_node_acl *nacl,
1003 struct t10_pr_registration *pr_reg,
33ce6a87 1004 enum register_type register_type,
c66ac9db
NB		 1005 int register_move)
1006{
c66ac9db
NB		 1007 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1008 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1009 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1010
1011 /*
1012 * Increment PRgeneration counter for struct se_device upon a successful
1013 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1014 *
1015 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1016 * action, the struct se_device->dev_reservation_lock will already be held,
1017 * so we do not call core_scsi3_pr_generation() which grabs the lock
1018 * for the REGISTER.
1019 */
1020 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1021 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1022 core_scsi3_pr_generation(dev);
1023
1024 spin_lock(&pr_tmpl->registration_lock);
1025 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1026 pr_reg->pr_reg_deve->def_pr_registered = 1;
1027
1028 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1029 spin_unlock(&pr_tmpl->registration_lock);
1030 /*
1031 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1032 */
6708bb27 1033 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1034 return;
1035 /*
1036 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1037 * allocated in __core_scsi3_alloc_registration()
1038 */
1039 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1040 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1041 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1042
1043 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1044
1045 spin_lock(&pr_tmpl->registration_lock);
1046 list_add_tail(&pr_reg_tmp->pr_reg_list,
1047 &pr_tmpl->registration_list);
1048 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1049
1050 __core_scsi3_dump_registration(tfo, dev,
1051 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1052 register_type);
1053 spin_unlock(&pr_tmpl->registration_lock);
1054 /*
1055 * Drop configfs group dependency reference from
1056 * __core_scsi3_alloc_registration()
1057 */
1058 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1059 }
1060}
1061
1062static int core_scsi3_alloc_registration(
1063 struct se_device *dev,
1064 struct se_node_acl *nacl,
1065 struct se_dev_entry *deve,
1066 unsigned char *isid,
1067 u64 sa_res_key,
1068 int all_tg_pt,
1069 int aptpl,
33ce6a87 1070 enum register_type register_type,
c66ac9db
NB		 1071 int register_move)
1072{
1073 struct t10_pr_registration *pr_reg;
1074
1075 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1076 sa_res_key, all_tg_pt, aptpl);
6708bb27 1077 if (!pr_reg)
e3d6f909 1078 return -EPERM;
c66ac9db
NB		 1079
1080 __core_scsi3_add_registration(dev, nacl, pr_reg,
1081 register_type, register_move);
1082 return 0;
1083}
1084
1085static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1086 struct se_device *dev,
1087 struct se_node_acl *nacl,
1088 unsigned char *isid)
1089{
0fd97ccf 1090 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1091 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1092 struct se_portal_group *tpg;
1093
1094 spin_lock(&pr_tmpl->registration_lock);
1095 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1096 &pr_tmpl->registration_list, pr_reg_list) {
1097 /*
1098 * First look for a matching struct se_node_acl
1099 */
1100 if (pr_reg->pr_reg_nacl != nacl)
1101 continue;
1102
1103 tpg = pr_reg->pr_reg_nacl->se_tpg;
1104 /*
1105 * If this registration does NOT contain a fabric provided
1106 * ISID, then we have found a match.
1107 */
6708bb27 1108 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1109 /*
1110 * Determine if this SCSI device server requires that
1111 * SCSI Intiatior TransportID w/ ISIDs is enforced
1112 * for fabric modules (iSCSI) requiring them.
1113 */
e3d6f909 1114 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1115 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1116 continue;
1117 }
33940d09 1118 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1119 spin_unlock(&pr_tmpl->registration_lock);
1120 return pr_reg;
1121 }
1122 /*
1123 * If the *pr_reg contains a fabric defined ISID for multi-value
1124 * SCSI Initiator Port TransportIDs, then we expect a valid
1125 * matching ISID to be provided by the local SCSI Initiator Port.
1126 */
6708bb27 1127 if (!isid)
c66ac9db
NB		 1128 continue;
1129 if (strcmp(isid, pr_reg->pr_reg_isid))
1130 continue;
1131
33940d09 1132 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1133 spin_unlock(&pr_tmpl->registration_lock);
1134 return pr_reg;
1135 }
1136 spin_unlock(&pr_tmpl->registration_lock);
1137
1138 return NULL;
1139}
1140
1141static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1142 struct se_device *dev,
1143 struct se_node_acl *nacl,
1144 struct se_session *sess)
1145{
1146 struct se_portal_group *tpg = nacl->se_tpg;
1147 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1148
e3d6f909 1149 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1150 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1151 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1152 PR_REG_ISID_LEN);
1153 isid_ptr = &buf[0];
1154 }
1155
1156 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1157}
1158
1159static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1160{
33940d09 1161 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1162}
1163
125d0119 1164static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1165 struct se_device *dev,
1166 struct t10_pr_registration *pr_reg)
1167{
1168 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1169 struct t10_pr_registration *pr_res_holder;
1170 int ret = 0;
1171
1172 spin_lock(&dev->dev_reservation_lock);
1173 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1174 if (!pr_res_holder) {
c66ac9db
NB		 1175 spin_unlock(&dev->dev_reservation_lock);
1176 return ret;
1177 }
1178 if (pr_res_holder == pr_reg) {
1179 /*
125d0119 1180 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1181 * is being released is holding the reservation.
1182 *
1183 * From spc4r17, section 5.7.11.1:
1184 *
1185 * e) If the I_T nexus is the persistent reservation holder
1186 * and the persistent reservation is not an all registrants
1187 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1188 * service action or REGISTER AND IGNORE EXISTING KEY
1189 * service action with the SERVICE ACTION RESERVATION KEY
1190 * field set to zero (see 5.7.11.3).
1191 */
6c3c9baa 1192 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
c66ac9db
NB		 1193 ret = 1;
1194 /*
1195 * For 'All Registrants' reservation types, all existing
1196 * registrations are still processed as reservation holders
1197 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1198 * reservation holder is implicitly released here.
c66ac9db
NB		 1199 */
1200 } else if (pr_reg->pr_reg_all_tg_pt &&
1201 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1202 pr_reg->pr_reg_nacl->initiatorname)) &&
1203 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1204 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1205 " UNREGISTER while existing reservation with matching"
1206 " key 0x%016Lx is present from another SCSI Initiator"
1207 " Port\n", pr_reg->pr_res_key);
e3d6f909 1208 ret = -EPERM;
c66ac9db
NB		 1209 }
1210 spin_unlock(&dev->dev_reservation_lock);
1211
1212 return ret;
1213}
1214
1215/*
e3d6f909 1216 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1217 */
1218static void __core_scsi3_free_registration(
1219 struct se_device *dev,
1220 struct t10_pr_registration *pr_reg,
1221 struct list_head *preempt_and_abort_list,
1222 int dec_holders)
1223{
1224 struct target_core_fabric_ops *tfo =
1225 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1226 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1227 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1228
1229 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1230 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 1231
1232 pr_reg->pr_reg_deve->def_pr_registered = 0;
1233 pr_reg->pr_reg_deve->pr_res_key = 0;
6c3c9baa
NB		 1234 if (!list_empty(&pr_reg->pr_reg_list))
1235 list_del(&pr_reg->pr_reg_list);
c66ac9db
NB		 1236 /*
1237 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1238 * so call core_scsi3_put_pr_reg() to decrement our reference.
1239 */
1240 if (dec_holders)
1241 core_scsi3_put_pr_reg(pr_reg);
1242 /*
1243 * Wait until all reference from any other I_T nexuses for this
1244 * *pr_reg have been released. Because list_del() is called above,
1245 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1246 * count back to zero, and we release *pr_reg.
1247 */
1248 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1249 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1250 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1251 tfo->get_fabric_name());
1252 cpu_relax();
1253 spin_lock(&pr_tmpl->registration_lock);
1254 }
1255
6708bb27 1256 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1257 " Node: %s%s\n", tfo->get_fabric_name(),
1258 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1259 i_buf);
6708bb27 1260 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1261 " Port(s)\n", tfo->get_fabric_name(),
1262 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1263 dev->transport->name);
6708bb27 1264 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1265 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1266 pr_reg->pr_res_generation);
1267
6708bb27 1268 if (!preempt_and_abort_list) {
c66ac9db
NB		 1269 pr_reg->pr_reg_deve = NULL;
1270 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1271 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1272 return;
1273 }
1274 /*
1275 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1276 * are released once the ABORT_TASK_SET has completed..
1277 */
1278 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1279}
1280
1281void core_scsi3_free_pr_reg_from_nacl(
1282 struct se_device *dev,
1283 struct se_node_acl *nacl)
1284{
0fd97ccf 1285 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1286 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
6c3c9baa 1287 bool free_reg = false;
c66ac9db
NB		 1288 /*
1289 * If the passed se_node_acl matches the reservation holder,
1290 * release the reservation.
1291 */
1292 spin_lock(&dev->dev_reservation_lock);
1293 pr_res_holder = dev->dev_pr_res_holder;
1294 if ((pr_res_holder != NULL) &&
6c3c9baa
NB		 1295 (pr_res_holder->pr_reg_nacl == nacl)) {
1296 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1297 free_reg = true;
1298 }
c66ac9db
NB		 1299 spin_unlock(&dev->dev_reservation_lock);
1300 /*
1301 * Release any registration associated with the struct se_node_acl.
1302 */
1303 spin_lock(&pr_tmpl->registration_lock);
6c3c9baa
NB		 1304 if (pr_res_holder && free_reg)
1305 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1306
c66ac9db
NB		 1307 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1308 &pr_tmpl->registration_list, pr_reg_list) {
1309
1310 if (pr_reg->pr_reg_nacl != nacl)
1311 continue;
1312
1313 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1314 }
1315 spin_unlock(&pr_tmpl->registration_lock);
1316}
1317
1318void core_scsi3_free_all_registrations(
1319 struct se_device *dev)
1320{
0fd97ccf 1321 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1322 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323
1324 spin_lock(&dev->dev_reservation_lock);
1325 pr_res_holder = dev->dev_pr_res_holder;
1326 if (pr_res_holder != NULL) {
1327 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1328 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 1329 pr_res_holder, 0, 0);
c66ac9db
NB		 1330 }
1331 spin_unlock(&dev->dev_reservation_lock);
1332
1333 spin_lock(&pr_tmpl->registration_lock);
1334 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1335 &pr_tmpl->registration_list, pr_reg_list) {
1336
1337 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1338 }
1339 spin_unlock(&pr_tmpl->registration_lock);
1340
1341 spin_lock(&pr_tmpl->aptpl_reg_lock);
1342 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1343 pr_reg_aptpl_list) {
1344 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1345 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1346 }
1347 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1348}
1349
1350static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1351{
e3d6f909 1352 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1353 &tpg->tpg_group.cg_item);
1354}
1355
1356static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1357{
e3d6f909 1358 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1359 &tpg->tpg_group.cg_item);
1360
33940d09 1361 atomic_dec_mb(&tpg->tpg_pr_ref_count);
c66ac9db
NB		 1362}
1363
1364static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1365{
1366 struct se_portal_group *tpg = nacl->se_tpg;
1367
1368 if (nacl->dynamic_node_acl)
1369 return 0;
1370
e3d6f909 1371 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1372 &nacl->acl_group.cg_item);
1373}
1374
1375static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1376{
1377 struct se_portal_group *tpg = nacl->se_tpg;
1378
1379 if (nacl->dynamic_node_acl) {
33940d09 1380 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1381 return;
1382 }
1383
e3d6f909 1384 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1385 &nacl->acl_group.cg_item);
1386
33940d09 1387 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1388}
1389
1390static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1391{
1392 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1393 struct se_node_acl *nacl;
1394 struct se_portal_group *tpg;
1395 /*
1396 * For nacl->dynamic_node_acl=1
1397 */
6708bb27 1398 if (!lun_acl)
c66ac9db
NB		 1399 return 0;
1400
1401 nacl = lun_acl->se_lun_nacl;
1402 tpg = nacl->se_tpg;
1403
e3d6f909 1404 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1405 &lun_acl->se_lun_group.cg_item);
1406}
1407
1408static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1409{
1410 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1411 struct se_node_acl *nacl;
1412 struct se_portal_group *tpg;
1413 /*
1414 * For nacl->dynamic_node_acl=1
1415 */
6708bb27 1416 if (!lun_acl) {
33940d09 1417 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1418 return;
1419 }
1420 nacl = lun_acl->se_lun_nacl;
1421 tpg = nacl->se_tpg;
1422
e3d6f909 1423 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1424 &lun_acl->se_lun_group.cg_item);
1425
33940d09 1426 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1427}
1428
de103c93
CH		 1429static sense_reason_t
1430core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1431 struct se_cmd *cmd,
1432 struct se_portal_group *tpg,
1433 unsigned char *l_isid,
1434 u64 sa_res_key,
1435 int all_tg_pt,
1436 int aptpl)
1437{
5951146d 1438 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1439 struct se_port *tmp_port;
1440 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1441 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1442 struct se_node_acl *dest_node_acl = NULL;
1443 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1444 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1445 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1446 LIST_HEAD(tid_dest_list);
c66ac9db
NB		 1447 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1448 struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1449 unsigned char *buf;
c66ac9db 1450 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
13ba564c 1451 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
de103c93 1452 sense_reason_t ret;
c66ac9db 1453 u32 tpdl, tid_len = 0;
d2843c17 1454 int dest_local_nexus;
c66ac9db
NB		 1455 u32 dest_rtpi = 0;
1456
f2083241 1457 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1458 /*
1459 * Allocate a struct pr_transport_id_holder and setup the
1460 * local_node_acl and local_se_deve pointers and add to
1461 * struct list_head tid_dest_list for add registration
1462 * processing in the loop of tid_dest_list below.
1463 */
1464 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1465 if (!tidh_new) {
1466 pr_err("Unable to allocate tidh_new\n");
de103c93 1467 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1468 }
1469 INIT_LIST_HEAD(&tidh_new->dest_list);
1470 tidh_new->dest_tpg = tpg;
1471 tidh_new->dest_node_acl = se_sess->se_node_acl;
1472 tidh_new->dest_se_deve = local_se_deve;
1473
5951146d 1474 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1475 se_sess->se_node_acl, local_se_deve, l_isid,
1476 sa_res_key, all_tg_pt, aptpl);
6708bb27 1477 if (!local_pr_reg) {
c66ac9db 1478 kfree(tidh_new);
de103c93 1479 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1480 }
1481 tidh_new->dest_pr_reg = local_pr_reg;
1482 /*
1483 * The local I_T nexus does not hold any configfs dependances,
1484 * so we set tid_h->dest_local_nexus=1 to prevent the
1485 * configfs_undepend_item() calls in the tid_dest_list loops below.
1486 */
1487 tidh_new->dest_local_nexus = 1;
1488 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1489
0d7f1299
PB		 1490 if (cmd->data_length < 28) {
1491 pr_warn("SPC-PR: Received PR OUT parameter list"
1492 " length too small: %u\n", cmd->data_length);
de103c93 1493 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1494 goto out;
1495 }
1496
4949314c 1497 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1498 if (!buf) {
1499 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1500 goto out;
1501 }
1502
c66ac9db
NB		 1503 /*
1504 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1505 * first extract TransportID Parameter Data Length, and make sure
1506 * the value matches up to the SCSI expected data transfer length.
1507 */
1508 tpdl = (buf[24] & 0xff) << 24;
1509 tpdl |= (buf[25] & 0xff) << 16;
1510 tpdl |= (buf[26] & 0xff) << 8;
1511 tpdl |= buf[27] & 0xff;
1512
1513 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1514 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1515 " does not equal CDB data_length: %u\n", tpdl,
1516 cmd->data_length);
de103c93
CH		 1517 ret = TCM_INVALID_PARAMETER_LIST;
1518 goto out_unmap;
c66ac9db
NB		 1519 }
1520 /*
1521 * Start processing the received transport IDs using the
1522 * receiving I_T Nexus portal's fabric dependent methods to
1523 * obtain the SCSI Initiator Port/Device Identifiers.
1524 */
1525 ptr = &buf[28];
1526
1527 while (tpdl > 0) {
1528 proto_ident = (ptr[0] & 0x0f);
1529 dest_tpg = NULL;
1530
1531 spin_lock(&dev->se_port_lock);
1532 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1533 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1534 if (!tmp_tpg)
c66ac9db 1535 continue;
e3d6f909 1536 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1537 if (!tmp_tf_ops)
c66ac9db 1538 continue;
6708bb27
AG		 1539 if (!tmp_tf_ops->get_fabric_proto_ident ||
1540 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1541 continue;
1542 /*
1543 * Look for the matching proto_ident provided by
1544 * the received TransportID
1545 */
1546 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1547 if (tmp_proto_ident != proto_ident)
1548 continue;
1549 dest_rtpi = tmp_port->sep_rtpi;
1550
1551 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1552 tmp_tpg, (const char *)ptr, &tid_len,
1553 &iport_ptr);
6708bb27 1554 if (!i_str)
c66ac9db
NB		 1555 continue;
1556
33940d09 1557 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
c66ac9db
NB		 1558 spin_unlock(&dev->se_port_lock);
1559
de103c93 1560 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1561 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db 1562 " for tmp_tpg\n");
33940d09 1563 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
de103c93
CH		 1564 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1565 goto out_unmap;
c66ac9db
NB		 1566 }
1567 /*
35d1efe8 1568 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1569 * from the decoded fabric module specific TransportID
1570 * at *i_str.
1571 */
28638887 1572 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1573 dest_node_acl = __core_tpg_get_initiator_node_acl(
1574 tmp_tpg, i_str);
33940d09
JE		 1575 if (dest_node_acl)
1576 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 1577 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1578
6708bb27 1579 if (!dest_node_acl) {
c66ac9db
NB		 1580 core_scsi3_tpg_undepend_item(tmp_tpg);
1581 spin_lock(&dev->se_port_lock);
1582 continue;
1583 }
1584
de103c93 1585 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1586 pr_err("configfs_depend_item() failed"
c66ac9db 1587 " for dest_node_acl->acl_group\n");
33940d09 1588 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 1589 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1590 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1591 goto out_unmap;
c66ac9db
NB		 1592 }
1593
1594 dest_tpg = tmp_tpg;
6708bb27 1595 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1596 " %s Port RTPI: %hu\n",
e3d6f909 1597 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1598 dest_node_acl->initiatorname, dest_rtpi);
1599
1600 spin_lock(&dev->se_port_lock);
1601 break;
1602 }
1603 spin_unlock(&dev->se_port_lock);
1604
6708bb27
AG		 1605 if (!dest_tpg) {
1606 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1607 " dest_tpg\n");
de103c93
CH		 1608 ret = TCM_INVALID_PARAMETER_LIST;
1609 goto out_unmap;
c66ac9db 1610 }
8b1e1244 1611
6708bb27 1612 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1613 " tid_len: %d for %s + %s\n",
e3d6f909 1614 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1615 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1616
c66ac9db 1617 if (tid_len > tpdl) {
6708bb27 1618 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1619 " %u for Transport ID: %s\n", tid_len, ptr);
1620 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1621 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1622 ret = TCM_INVALID_PARAMETER_LIST;
1623 goto out_unmap;
c66ac9db
NB		 1624 }
1625 /*
1626 * Locate the desintation struct se_dev_entry pointer for matching
1627 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1628 * Target Port.
1629 */
1630 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1631 dest_rtpi);
6708bb27
AG		 1632 if (!dest_se_deve) {
1633 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1634 " from destination RTPI: %hu\n",
e3d6f909 1635 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1636 dest_rtpi);
1637
1638 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1639 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1640 ret = TCM_INVALID_PARAMETER_LIST;
1641 goto out_unmap;
c66ac9db
NB		 1642 }
1643
de103c93 1644 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1645 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db 1646 " failed\n");
33940d09 1647 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db
NB		 1648 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1649 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1650 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1651 goto out_unmap;
c66ac9db 1652 }
8b1e1244 1653
6708bb27 1654 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1655 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1656 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1657 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1658
c66ac9db
NB		 1659 /*
1660 * Skip any TransportIDs that already have a registration for
1661 * this target port.
1662 */
1663 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1664 iport_ptr);
1665 if (pr_reg_e) {
1666 core_scsi3_put_pr_reg(pr_reg_e);
1667 core_scsi3_lunacl_undepend_item(dest_se_deve);
1668 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669 core_scsi3_tpg_undepend_item(dest_tpg);
1670 ptr += tid_len;
1671 tpdl -= tid_len;
1672 tid_len = 0;
1673 continue;
1674 }
1675 /*
1676 * Allocate a struct pr_transport_id_holder and setup
1677 * the dest_node_acl and dest_se_deve pointers for the
1678 * loop below.
1679 */
1680 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1681 GFP_KERNEL);
6708bb27
AG		 1682 if (!tidh_new) {
1683 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1684 core_scsi3_lunacl_undepend_item(dest_se_deve);
1685 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1686 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1687 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1688 goto out_unmap;
c66ac9db
NB		 1689 }
1690 INIT_LIST_HEAD(&tidh_new->dest_list);
1691 tidh_new->dest_tpg = dest_tpg;
1692 tidh_new->dest_node_acl = dest_node_acl;
1693 tidh_new->dest_se_deve = dest_se_deve;
1694
1695 /*
1696 * Allocate, but do NOT add the registration for the
1697 * TransportID referenced SCSI Initiator port. This
1698 * done because of the following from spc4r17 in section
1699 * 6.14.3 wrt SPEC_I_PT:
1700 *
1701 * "If a registration fails for any initiator port (e.g., if th
1702 * logical unit does not have enough resources available to
1703 * hold the registration information), no registrations shall be
1704 * made, and the command shall be terminated with
1705 * CHECK CONDITION status."
1706 *
1707 * That means we call __core_scsi3_alloc_registration() here,
1708 * and then call __core_scsi3_add_registration() in the
1709 * 2nd loop which will never fail.
1710 */
5951146d 1711 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1712 dest_node_acl, dest_se_deve, iport_ptr,
1713 sa_res_key, all_tg_pt, aptpl);
6708bb27 1714 if (!dest_pr_reg) {
c66ac9db
NB		 1715 core_scsi3_lunacl_undepend_item(dest_se_deve);
1716 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1717 core_scsi3_tpg_undepend_item(dest_tpg);
1718 kfree(tidh_new);
de103c93
CH		 1719 ret = TCM_INVALID_PARAMETER_LIST;
1720 goto out_unmap;
c66ac9db
NB		 1721 }
1722 tidh_new->dest_pr_reg = dest_pr_reg;
1723 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1724
1725 ptr += tid_len;
1726 tpdl -= tid_len;
1727 tid_len = 0;
1728
1729 }
05d1c7c0 1730
4949314c 1731 transport_kunmap_data_sg(cmd);
05d1c7c0 1732
c66ac9db
NB		 1733 /*
1734 * Go ahead and create a registrations from tid_dest_list for the
1735 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1736 * and dest_se_deve.
1737 *
1738 * The SA Reservation Key from the PROUT is set for the
1739 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1740 * means that the TransportID Initiator port will be
1741 * registered on all of the target ports in the SCSI target device
1742 * ALL_TG_PT=0 means the registration will only be for the
1743 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1744 * was received.
1745 */
1746 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1747 dest_tpg = tidh->dest_tpg;
1748 dest_node_acl = tidh->dest_node_acl;
1749 dest_se_deve = tidh->dest_se_deve;
1750 dest_pr_reg = tidh->dest_pr_reg;
1751 dest_local_nexus = tidh->dest_local_nexus;
1752
1753 list_del(&tidh->dest_list);
1754 kfree(tidh);
1755
1756 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1757 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1758
5951146d 1759 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1760 dest_pr_reg, 0, 0);
1761
6708bb27 1762 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1763 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1764 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
d2843c17 1765 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
c66ac9db
NB		 1766
1767 if (dest_local_nexus)
1768 continue;
1769
1770 core_scsi3_lunacl_undepend_item(dest_se_deve);
1771 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1772 core_scsi3_tpg_undepend_item(dest_tpg);
1773 }
1774
1775 return 0;
de103c93 1776out_unmap:
4949314c 1777 transport_kunmap_data_sg(cmd);
de103c93 1778out:
c66ac9db
NB		 1779 /*
1780 * For the failure case, release everything from tid_dest_list
1781 * including *dest_pr_reg and the configfs dependances..
1782 */
1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1784 dest_tpg = tidh->dest_tpg;
1785 dest_node_acl = tidh->dest_node_acl;
1786 dest_se_deve = tidh->dest_se_deve;
1787 dest_pr_reg = tidh->dest_pr_reg;
1788 dest_local_nexus = tidh->dest_local_nexus;
1789
1790 list_del(&tidh->dest_list);
1791 kfree(tidh);
1792 /*
1793 * Release any extra ALL_TG_PT=1 registrations for
1794 * the SPEC_I_PT=1 case.
1795 */
1796 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1797 &dest_pr_reg->pr_reg_atp_list,
1798 pr_reg_atp_mem_list) {
1799 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1800 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1801 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1802 }
1803
c66ac9db
NB		 1804 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1805
1806 if (dest_local_nexus)
1807 continue;
1808
1809 core_scsi3_lunacl_undepend_item(dest_se_deve);
1810 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1811 core_scsi3_tpg_undepend_item(dest_tpg);
1812 }
1813 return ret;
1814}
1815
3c8a6228 1816static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1817 struct se_device *dev,
1818 unsigned char *buf,
0607decd 1819 u32 pr_aptpl_buf_len)
c66ac9db
NB		 1820{
1821 struct se_lun *lun;
1822 struct se_portal_group *tpg;
c66ac9db
NB		 1823 struct t10_pr_registration *pr_reg;
1824 unsigned char tmp[512], isid_buf[32];
1825 ssize_t len = 0;
1826 int reg_count = 0;
3c8a6228 1827 int ret = 0;
c66ac9db 1828
3c8a6228
AG		 1829 spin_lock(&dev->dev_reservation_lock);
1830 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1831 /*
1832 * Walk the registration list..
1833 */
0fd97ccf 1834 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1835 pr_reg_list) {
1836
1837 tmp[0] = '\0';
1838 isid_buf[0] = '\0';
1839 tpg = pr_reg->pr_reg_nacl->se_tpg;
1840 lun = pr_reg->pr_reg_tg_pt_lun;
1841 /*
1842 * Write out any ISID value to APTPL metadata that was included
1843 * in the original registration.
1844 */
1845 if (pr_reg->isid_present_at_reg)
1846 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1847 pr_reg->pr_reg_isid);
1848 /*
1849 * Include special metadata if the pr_reg matches the
1850 * reservation holder.
1851 */
1852 if (dev->dev_pr_res_holder == pr_reg) {
1853 snprintf(tmp, 512, "PR_REG_START: %d"
1854 "\ninitiator_fabric=%s\n"
1855 "initiator_node=%s\n%s"
1856 "sa_res_key=%llu\n"
1857 "res_holder=1\nres_type=%02x\n"
1858 "res_scope=%02x\nres_all_tg_pt=%d\n"
1859 "mapped_lun=%u\n", reg_count,
e3d6f909 1860 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1861 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1862 pr_reg->pr_res_key, pr_reg->pr_res_type,
1863 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1864 pr_reg->pr_res_mapped_lun);
1865 } else {
1866 snprintf(tmp, 512, "PR_REG_START: %d\n"
1867 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1868 "sa_res_key=%llu\nres_holder=0\n"
1869 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1870 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1871 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1872 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1873 pr_reg->pr_res_mapped_lun);
1874 }
1875
60d645a4 1876 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1877 pr_err("Unable to update renaming"
c66ac9db 1878 " APTPL metadata\n");
3c8a6228
AG		 1879 ret = -EMSGSIZE;
1880 goto out;
c66ac9db
NB		 1881 }
1882 len += sprintf(buf+len, "%s", tmp);
1883
1884 /*
1885 * Include information about the associated SCSI target port.
1886 */
1887 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1888 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1889 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1890 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1891 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1892 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1893
60d645a4 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1895 pr_err("Unable to update renaming"
c66ac9db 1896 " APTPL metadata\n");
3c8a6228
AG		 1897 ret = -EMSGSIZE;
1898 goto out;
c66ac9db
NB		 1899 }
1900 len += sprintf(buf+len, "%s", tmp);
1901 reg_count++;
1902 }
c66ac9db 1903
6708bb27 1904 if (!reg_count)
c66ac9db
NB		 1905 len += sprintf(buf+len, "No Registrations or Reservations");
1906
3c8a6228
AG		 1907out:
1908 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1909 spin_unlock(&dev->dev_reservation_lock);
1910
1911 return ret;
1912}
1913
c66ac9db
NB		 1914static int __core_scsi3_write_aptpl_to_file(
1915 struct se_device *dev,
4dee96fb 1916 unsigned char *buf)
c66ac9db 1917{
0fd97ccf 1918 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1919 struct file *file;
c66ac9db
NB		 1920 int flags = O_RDWR | O_CREAT | O_TRUNC;
1921 char path[512];
4dee96fb 1922 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1923 int ret;
1924
c66ac9db
NB		 1925 memset(path, 0, 512);
1926
60d645a4 1927 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1928 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1929 " into path buffer\n");
e3d6f909 1930 return -EMSGSIZE;
c66ac9db
NB		 1931 }
1932
1933 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1934 file = filp_open(path, flags, 0600);
0e9b10a9 1935 if (IS_ERR(file)) {
6708bb27 1936 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1937 " failed\n", path);
0e9b10a9 1938 return PTR_ERR(file);
c66ac9db
NB		 1939 }
1940
4dee96fb 1941 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1942
0e9b10a9 1943 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1944
0e9b10a9 1945 if (ret < 0)
6708bb27 1946 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1947 fput(file);
c66ac9db 1948
f730f915 1949 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 1950}
1951
459f213b
AG		 1952/*
1953 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1954 * write out the updated metadata to struct file for this SCSI device.
1955 */
8a391857 1956static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 1957{
8a391857
NB		 1958 unsigned char *buf;
1959 int rc;
de103c93 1960
459f213b
AG		 1961 if (!aptpl) {
1962 char *null_buf = "No Registrations or Reservations\n";
1963
8a391857 1964 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 1965 dev->t10_pr.pr_aptpl_active = 0;
1966 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 1967
8a391857
NB		 1968 if (rc)
1969 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 1970
8a391857
NB		 1971 return 0;
1972 }
459f213b 1973
8a391857
NB		 1974 buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
1975 if (!buf)
1976 return TCM_OUT_OF_RESOURCES;
1977
1978 rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN);
1979 if (rc < 0) {
459f213b 1980 kfree(buf);
8a391857 1981 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1982 }
1983
8a391857
NB		 1984 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1985 if (rc != 0) {
1986 pr_err("SPC-3 PR: Could not update APTPL\n");
1987 kfree(buf);
1988 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1989 }
1990 dev->t10_pr.pr_aptpl_active = 1;
1991 kfree(buf);
1992 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1993 return 0;
c66ac9db
NB		 1994}
1995
de103c93
CH		 1996static sense_reason_t
1997core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 1998 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 1999{
e3d6f909 2000 struct se_session *se_sess = cmd->se_sess;
5951146d 2001 struct se_device *dev = cmd->se_dev;
c66ac9db 2002 struct se_dev_entry *se_deve;
e3d6f909 2003 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2004 struct se_portal_group *se_tpg;
bc118fe4 2005 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2006 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2007 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2008 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2009 int pr_holder = 0, type;
c66ac9db 2010
6708bb27
AG		 2011 if (!se_sess || !se_lun) {
2012 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2013 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2014 }
2015 se_tpg = se_sess->se_tpg;
f2083241 2016 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2017
e3d6f909 2018 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2019 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2020 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2021 PR_REG_ISID_LEN);
2022 isid_ptr = &isid_buf[0];
2023 }
2024 /*
2025 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2026 */
bc118fe4
AG		 2027 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2028 if (!pr_reg) {
c66ac9db 2029 if (res_key) {
6708bb27 2030 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2031 " for SA REGISTER, returning CONFLICT\n");
de103c93 2032 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2033 }
2034 /*
2035 * Do nothing but return GOOD status.
2036 */
6708bb27 2037 if (!sa_res_key)
03e98c9e 2038 return 0;
c66ac9db 2039
6708bb27 2040 if (!spec_i_pt) {
c66ac9db
NB		 2041 /*
2042 * Perform the Service Action REGISTER on the Initiator
2043 * Port Endpoint that the PRO was received from on the
2044 * Logical Unit of the SCSI device server.
2045 */
de103c93 2046 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2047 se_sess->se_node_acl, se_deve, isid_ptr,
2048 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2049 register_type, 0)) {
6708bb27 2050 pr_err("Unable to allocate"
c66ac9db 2051 " struct t10_pr_registration\n");
de103c93 2052 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2053 }
2054 } else {
2055 /*
2056 * Register both the Initiator port that received
2057 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2058 * TransportID from Parameter list and loop through
2059 * fabric dependent parameter list while calling
2060 * logic from of core_scsi3_alloc_registration() for
2061 * each TransportID provided SCSI Initiator Port/Device
2062 */
2063 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2064 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2065 if (ret != 0)
2066 return ret;
2067 }
c66ac9db 2068
459f213b 2069 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2070 }
2071
bc118fe4
AG		 2072 /* ok, existing registration */
2073
2074 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2075 pr_err("SPC-3 PR REGISTER: Received"
2076 " res_key: 0x%016Lx does not match"
2077 " existing SA REGISTER res_key:"
2078 " 0x%016Lx\n", res_key,
2079 pr_reg->pr_res_key);
2080 ret = TCM_RESERVATION_CONFLICT;
2081 goto out;
de103c93
CH		 2082 }
2083
2084 if (spec_i_pt) {
1f070cc2
AG		 2085 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2086 " set on a registered nexus\n");
de103c93 2087 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2088 goto out;
de103c93
CH		 2089 }
2090
2091 /*
2092 * An existing ALL_TG_PT=1 registration being released
2093 * must also set ALL_TG_PT=1 in the incoming PROUT.
2094 */
1f070cc2
AG		 2095 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2096 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2097 " registration exists, but ALL_TG_PT=1 bit not"
2098 " present in received PROUT\n");
2099 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2100 goto out;
de103c93
CH		 2101 }
2102
de103c93 2103 /*
51d9c41d 2104 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2105 */
51d9c41d
AG		 2106 if (sa_res_key) {
2107 /*
2108 * Increment PRgeneration counter for struct se_device"
2109 * upon a successful REGISTER, see spc4r17 section 6.3.2
2110 * READ_KEYS service action.
2111 */
2112 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2113 pr_reg->pr_res_key = sa_res_key;
2114 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2115 " Key for %s to: 0x%016Lx PRgeneration:"
2116 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2117 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2118 pr_reg->pr_reg_nacl->initiatorname,
2119 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2120
2121 } else {
2122 /*
2123 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2124 */
6c3c9baa
NB		 2125 type = pr_reg->pr_res_type;
2126 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2127 pr_reg);
de103c93 2128 if (pr_holder < 0) {
de103c93 2129 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2130 goto out;
c66ac9db 2131 }
de103c93
CH		 2132
2133 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2134 /*
de103c93
CH		 2135 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2136 * and matching pr_res_key.
c66ac9db 2137 */
de103c93
CH		 2138 if (pr_reg->pr_reg_all_tg_pt) {
2139 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2140 &pr_tmpl->registration_list,
2141 pr_reg_list) {
2142
2143 if (!pr_reg_p->pr_reg_all_tg_pt)
2144 continue;
2145 if (pr_reg_p->pr_res_key != res_key)
2146 continue;
2147 if (pr_reg == pr_reg_p)
2148 continue;
2149 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2150 pr_reg_p->pr_reg_nacl->initiatorname))
2151 continue;
2152
2153 __core_scsi3_free_registration(dev,
2154 pr_reg_p, NULL, 0);
c66ac9db
NB		 2155 }
2156 }
de103c93 2157
c66ac9db 2158 /*
de103c93 2159 * Release the calling I_T Nexus registration now..
c66ac9db 2160 */
de103c93 2161 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2162 pr_reg = NULL;
c66ac9db 2163
de103c93
CH		 2164 /*
2165 * From spc4r17, section 5.7.11.3 Unregistering
2166 *
2167 * If the persistent reservation is a registrants only
2168 * type, the device server shall establish a unit
2169 * attention condition for the initiator port associated
2170 * with every registered I_T nexus except for the I_T
2171 * nexus on which the PERSISTENT RESERVE OUT command was
2172 * received, with the additional sense code set to
2173 * RESERVATIONS RELEASED.
2174 */
2175 if (pr_holder &&
fc09149d
NB		 2176 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2177 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2178 list_for_each_entry(pr_reg_p,
2179 &pr_tmpl->registration_list,
2180 pr_reg_list) {
2181
2182 core_scsi3_ua_allocate(
2183 pr_reg_p->pr_reg_nacl,
2184 pr_reg_p->pr_res_mapped_lun,
2185 0x2A,
2186 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2187 }
de103c93 2188 }
c66ac9db 2189
51d9c41d 2190 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2191 }
c66ac9db 2192
459f213b 2193 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2194
bc118fe4 2195out:
fc09149d
NB		 2196 if (pr_reg)
2197 core_scsi3_put_pr_reg(pr_reg);
de103c93 2198 return ret;
c66ac9db
NB		 2199}
2200
2201unsigned char *core_scsi3_pr_dump_type(int type)
2202{
2203 switch (type) {
2204 case PR_TYPE_WRITE_EXCLUSIVE:
2205 return "Write Exclusive Access";
2206 case PR_TYPE_EXCLUSIVE_ACCESS:
2207 return "Exclusive Access";
2208 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2209 return "Write Exclusive Access, Registrants Only";
2210 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2211 return "Exclusive Access, Registrants Only";
2212 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2213 return "Write Exclusive Access, All Registrants";
2214 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2215 return "Exclusive Access, All Registrants";
2216 default:
2217 break;
2218 }
2219
2220 return "Unknown SPC-3 PR Type";
2221}
2222
de103c93
CH		 2223static sense_reason_t
2224core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2225{
de103c93 2226 struct se_device *dev = cmd->se_dev;
e3d6f909 2227 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2228 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2229 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2230 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2231 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2232 sense_reason_t ret;
c66ac9db
NB		 2233
2234 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2235
6708bb27
AG		 2236 if (!se_sess || !se_lun) {
2237 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2238 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2239 }
c66ac9db
NB		 2240 /*
2241 * Locate the existing *pr_reg via struct se_node_acl pointers
2242 */
5951146d 2243 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2244 se_sess);
6708bb27
AG		 2245 if (!pr_reg) {
2246 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2247 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2248 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2249 }
2250 /*
2251 * From spc4r17 Section 5.7.9: Reserving:
2252 *
2253 * An application client creates a persistent reservation by issuing
2254 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2255 * a registered I_T nexus with the following parameters:
2256 * a) RESERVATION KEY set to the value of the reservation key that is
2257 * registered with the logical unit for the I_T nexus; and
2258 */
2259 if (res_key != pr_reg->pr_res_key) {
6708bb27 2260 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2261 " does not match existing SA REGISTER res_key:"
2262 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2263 ret = TCM_RESERVATION_CONFLICT;
2264 goto out_put_pr_reg;
c66ac9db
NB		 2265 }
2266 /*
2267 * From spc4r17 Section 5.7.9: Reserving:
2268 *
2269 * From above:
2270 * b) TYPE field and SCOPE field set to the persistent reservation
2271 * being created.
2272 *
2273 * Only one persistent reservation is allowed at a time per logical unit
2274 * and that persistent reservation has a scope of LU_SCOPE.
2275 */
2276 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2277 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2278 ret = TCM_INVALID_PARAMETER_LIST;
2279 goto out_put_pr_reg;
c66ac9db
NB		 2280 }
2281 /*
2282 * See if we have an existing PR reservation holder pointer at
2283 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2284 * *pr_res_holder.
2285 */
2286 spin_lock(&dev->dev_reservation_lock);
2287 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2288 if (pr_res_holder) {
ae450e24 2289 int pr_res_type = pr_res_holder->pr_res_type;
c66ac9db
NB		 2290 /*
2291 * From spc4r17 Section 5.7.9: Reserving:
2292 *
2293 * If the device server receives a PERSISTENT RESERVE OUT
2294 * command from an I_T nexus other than a persistent reservation
2295 * holder (see 5.7.10) that attempts to create a persistent
2296 * reservation when a persistent reservation already exists for
2297 * the logical unit, then the command shall be completed with
2298 * RESERVATION CONFLICT status.
2299 */
ae450e24
NB		 2300 if ((pr_res_holder != pr_reg) &&
2301 (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2302 (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
c66ac9db 2303 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2304 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2305 " [%s]: %s while reservation already held by"
2306 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2307 cmd->se_tfo->get_fabric_name(),
c66ac9db 2308 se_sess->se_node_acl->initiatorname,
e3d6f909 2309 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2310 pr_res_holder->pr_reg_nacl->initiatorname);
2311
2312 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2313 ret = TCM_RESERVATION_CONFLICT;
2314 goto out_put_pr_reg;
c66ac9db
NB		 2315 }
2316 /*
2317 * From spc4r17 Section 5.7.9: Reserving:
2318 *
2319 * If a persistent reservation holder attempts to modify the
2320 * type or scope of an existing persistent reservation, the
2321 * command shall be completed with RESERVATION CONFLICT status.
2322 */
2323 if ((pr_res_holder->pr_res_type != type) ||
2324 (pr_res_holder->pr_res_scope != scope)) {
2325 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2326 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2327 " [%s]: %s trying to change TYPE and/or SCOPE,"
2328 " while reservation already held by [%s]: %s,"
2329 " returning RESERVATION_CONFLICT\n",
e3d6f909 2330 cmd->se_tfo->get_fabric_name(),
c66ac9db 2331 se_sess->se_node_acl->initiatorname,
e3d6f909 2332 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2333 pr_res_holder->pr_reg_nacl->initiatorname);
2334
2335 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2336 ret = TCM_RESERVATION_CONFLICT;
2337 goto out_put_pr_reg;
c66ac9db
NB		 2338 }
2339 /*
2340 * From spc4r17 Section 5.7.9: Reserving:
2341 *
2342 * If the device server receives a PERSISTENT RESERVE OUT
2343 * command with RESERVE service action where the TYPE field and
2344 * the SCOPE field contain the same values as the existing type
2345 * and scope from a persistent reservation holder, it shall not
2346 * make any change to the existing persistent reservation and
2347 * shall completethe command with GOOD status.
2348 */
2349 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2350 ret = 0;
2351 goto out_put_pr_reg;
c66ac9db
NB		 2352 }
2353 /*
2354 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2355 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2356 */
2357 pr_reg->pr_res_scope = scope;
2358 pr_reg->pr_res_type = type;
2359 pr_reg->pr_res_holder = 1;
2360 dev->dev_pr_res_holder = pr_reg;
d2843c17 2361 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2362
6708bb27 2363 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2364 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2365 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2366 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2367 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2368 cmd->se_tfo->get_fabric_name(),
c66ac9db 2369 se_sess->se_node_acl->initiatorname,
d2843c17 2370 i_buf);
c66ac9db
NB		 2371 spin_unlock(&dev->dev_reservation_lock);
2372
459f213b
AG		 2373 if (pr_tmpl->pr_aptpl_active)
2374 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2375
de103c93
CH		 2376 ret = 0;
2377out_put_pr_reg:
c66ac9db 2378 core_scsi3_put_pr_reg(pr_reg);
de103c93 2379 return ret;
c66ac9db
NB		 2380}
2381
de103c93
CH		 2382static sense_reason_t
2383core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2384 u64 res_key)
c66ac9db 2385{
c66ac9db
NB		 2386 switch (type) {
2387 case PR_TYPE_WRITE_EXCLUSIVE:
2388 case PR_TYPE_EXCLUSIVE_ACCESS:
2389 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2390 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2391 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2392 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2393 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2394 default:
6708bb27 2395 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2396 " 0x%02x\n", type);
de103c93 2397 return TCM_INVALID_CDB_FIELD;
c66ac9db 2398 }
c66ac9db
NB		 2399}
2400
2401/*
2402 * Called with struct se_device->dev_reservation_lock held.
2403 */
2404static void __core_scsi3_complete_pro_release(
2405 struct se_device *dev,
2406 struct se_node_acl *se_nacl,
2407 struct t10_pr_registration *pr_reg,
6c3c9baa
NB		 2408 int explicit,
2409 int unreg)
c66ac9db
NB		 2410{
2411 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2412 char i_buf[PR_REG_ISID_ID_LEN];
6c3c9baa 2413 int pr_res_type = 0, pr_res_scope = 0;
c66ac9db
NB		 2414
2415 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2416 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2417 /*
2418 * Go ahead and release the current PR reservation holder.
6c3c9baa
NB		 2419 * If an All Registrants reservation is currently active and
2420 * a unregister operation is requested, replace the current
2421 * dev_pr_res_holder with another active registration.
2422 */
2423 if (dev->dev_pr_res_holder) {
2424 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2425 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2426 dev->dev_pr_res_holder->pr_res_type = 0;
2427 dev->dev_pr_res_holder->pr_res_scope = 0;
2428 dev->dev_pr_res_holder->pr_res_holder = 0;
2429 dev->dev_pr_res_holder = NULL;
2430 }
2431 if (!unreg)
2432 goto out;
c66ac9db 2433
6c3c9baa
NB		 2434 spin_lock(&dev->t10_pr.registration_lock);
2435 list_del_init(&pr_reg->pr_reg_list);
2436 /*
2437 * If the I_T nexus is a reservation holder, the persistent reservation
2438 * is of an all registrants type, and the I_T nexus is the last remaining
2439 * registered I_T nexus, then the device server shall also release the
2440 * persistent reservation.
2441 */
2442 if (!list_empty(&dev->t10_pr.registration_list) &&
2443 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2444 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2445 dev->dev_pr_res_holder =
2446 list_entry(dev->t10_pr.registration_list.next,
2447 struct t10_pr_registration, pr_reg_list);
2448 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2449 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2450 dev->dev_pr_res_holder->pr_res_holder = 1;
2451 }
2452 spin_unlock(&dev->t10_pr.registration_lock);
2453out:
2454 if (!dev->dev_pr_res_holder) {
2455 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2456 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2457 tfo->get_fabric_name(), (explicit) ? "explicit" :
2458 "implicit", core_scsi3_pr_dump_type(pr_res_type),
2459 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2460 }
6708bb27 2461 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2462 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2463 i_buf);
c66ac9db
NB		 2464 /*
2465 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2466 */
2467 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2468}
2469
de103c93
CH		 2470static sense_reason_t
2471core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2472 u64 res_key)
c66ac9db
NB		 2473{
2474 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2475 struct se_session *se_sess = cmd->se_sess;
2476 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2477 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2478 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93
CH		 2479 int all_reg = 0;
2480 sense_reason_t ret = 0;
c66ac9db 2481
6708bb27
AG		 2482 if (!se_sess || !se_lun) {
2483 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2484 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2485 }
2486 /*
2487 * Locate the existing *pr_reg via struct se_node_acl pointers
2488 */
2489 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2490 if (!pr_reg) {
2491 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2492 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2493 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2494 }
2495 /*
2496 * From spc4r17 Section 5.7.11.2 Releasing:
2497 *
2498 * If there is no persistent reservation or in response to a persistent
2499 * reservation release request from a registered I_T nexus that is not a
2500 * persistent reservation holder (see 5.7.10), the device server shall
2501 * do the following:
2502 *
2503 * a) Not release the persistent reservation, if any;
2504 * b) Not remove any registrations; and
2505 * c) Complete the command with GOOD status.
2506 */
2507 spin_lock(&dev->dev_reservation_lock);
2508 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2509 if (!pr_res_holder) {
c66ac9db
NB		 2510 /*
2511 * No persistent reservation, return GOOD status.
2512 */
2513 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2514 goto out_put_pr_reg;
c66ac9db
NB		 2515 }
2516 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2517 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2518 all_reg = 1;
2519
2520 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2521 /*
2522 * Non 'All Registrants' PR Type cases..
2523 * Release request from a registered I_T nexus that is not a
2524 * persistent reservation holder. return GOOD status.
2525 */
2526 spin_unlock(&dev->dev_reservation_lock);
de103c93 2527 goto out_put_pr_reg;
c66ac9db 2528 }
de103c93 2529
c66ac9db
NB		 2530 /*
2531 * From spc4r17 Section 5.7.11.2 Releasing:
2532 *
2533 * Only the persistent reservation holder (see 5.7.10) is allowed to
2534 * release a persistent reservation.
2535 *
2536 * An application client releases the persistent reservation by issuing
2537 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2538 * an I_T nexus that is a persistent reservation holder with the
2539 * following parameters:
2540 *
2541 * a) RESERVATION KEY field set to the value of the reservation key
2542 * that is registered with the logical unit for the I_T nexus;
2543 */
2544 if (res_key != pr_reg->pr_res_key) {
6708bb27 2545 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2546 " does not match existing SA REGISTER res_key:"
2547 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2548 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2549 ret = TCM_RESERVATION_CONFLICT;
2550 goto out_put_pr_reg;
c66ac9db
NB		 2551 }
2552 /*
2553 * From spc4r17 Section 5.7.11.2 Releasing and above:
2554 *
2555 * b) TYPE field and SCOPE field set to match the persistent
2556 * reservation being released.
2557 */
2558 if ((pr_res_holder->pr_res_type != type) ||
2559 (pr_res_holder->pr_res_scope != scope)) {
2560 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2561 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2562 " reservation from [%s]: %s with different TYPE "
2563 "and/or SCOPE while reservation already held by"
2564 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2565 cmd->se_tfo->get_fabric_name(),
c66ac9db 2566 se_sess->se_node_acl->initiatorname,
e3d6f909 2567 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2568 pr_res_holder->pr_reg_nacl->initiatorname);
2569
2570 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2571 ret = TCM_RESERVATION_CONFLICT;
2572 goto out_put_pr_reg;
c66ac9db
NB		 2573 }
2574 /*
2575 * In response to a persistent reservation release request from the
2576 * persistent reservation holder the device server shall perform a
2577 * release by doing the following as an uninterrupted series of actions:
2578 * a) Release the persistent reservation;
2579 * b) Not remove any registration(s);
2580 * c) If the released persistent reservation is a registrants only type
2581 * or all registrants type persistent reservation,
2582 * the device server shall establish a unit attention condition for
2583 * the initiator port associated with every regis-
2584 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2585 * RESERVE OUT command with RELEASE service action was received,
2586 * with the additional sense code set to RESERVATIONS RELEASED; and
2587 * d) If the persistent reservation is of any other type, the device
2588 * server shall not establish a unit attention condition.
2589 */
2590 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
6c3c9baa 2591 pr_reg, 1, 0);
c66ac9db
NB		 2592
2593 spin_unlock(&dev->dev_reservation_lock);
2594
2595 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2596 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2597 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2598 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2599 /*
2600 * If no UNIT ATTENTION conditions will be established for
2601 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2602 * go ahead and check for APTPL=1 update+write below
2603 */
2604 goto write_aptpl;
2605 }
2606
2607 spin_lock(&pr_tmpl->registration_lock);
2608 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2609 pr_reg_list) {
2610 /*
2611 * Do not establish a UNIT ATTENTION condition
2612 * for the calling I_T Nexus
2613 */
2614 if (pr_reg_p == pr_reg)
2615 continue;
2616
2617 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2618 pr_reg_p->pr_res_mapped_lun,
2619 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2620 }
2621 spin_unlock(&pr_tmpl->registration_lock);
2622
2623write_aptpl:
459f213b
AG		 2624 if (pr_tmpl->pr_aptpl_active)
2625 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2626
de103c93 2627out_put_pr_reg:
c66ac9db 2628 core_scsi3_put_pr_reg(pr_reg);
de103c93 2629 return ret;
c66ac9db
NB		 2630}
2631
de103c93
CH		 2632static sense_reason_t
2633core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2634{
2635 struct se_device *dev = cmd->se_dev;
2636 struct se_node_acl *pr_reg_nacl;
e3d6f909 2637 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2638 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2639 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2640 u32 pr_res_mapped_lun = 0;
2641 int calling_it_nexus = 0;
2642 /*
2643 * Locate the existing *pr_reg via struct se_node_acl pointers
2644 */
5951146d 2645 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2646 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2647 if (!pr_reg_n) {
2648 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2649 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2650 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2651 }
2652 /*
2653 * From spc4r17 section 5.7.11.6, Clearing:
2654 *
2655 * Any application client may release the persistent reservation and
2656 * remove all registrations from a device server by issuing a
2657 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2658 * registered I_T nexus with the following parameter:
2659 *
2660 * a) RESERVATION KEY field set to the value of the reservation key
2661 * that is registered with the logical unit for the I_T nexus.
2662 */
2663 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2664 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2665 " res_key: 0x%016Lx does not match"
2666 " existing SA REGISTER res_key:"
2667 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2668 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2669 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2670 }
2671 /*
2672 * a) Release the persistent reservation, if any;
2673 */
2674 spin_lock(&dev->dev_reservation_lock);
2675 pr_res_holder = dev->dev_pr_res_holder;
2676 if (pr_res_holder) {
2677 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2678 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 2679 pr_res_holder, 0, 0);
c66ac9db
NB		 2680 }
2681 spin_unlock(&dev->dev_reservation_lock);
2682 /*
2683 * b) Remove all registration(s) (see spc4r17 5.7.7);
2684 */
2685 spin_lock(&pr_tmpl->registration_lock);
2686 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2687 &pr_tmpl->registration_list, pr_reg_list) {
2688
2689 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2690 pr_reg_nacl = pr_reg->pr_reg_nacl;
2691 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2692 __core_scsi3_free_registration(dev, pr_reg, NULL,
2693 calling_it_nexus);
2694 /*
2695 * e) Establish a unit attention condition for the initiator
2696 * port associated with every registered I_T nexus other
2697 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2698 * command with CLEAR service action was received, with the
2699 * additional sense code set to RESERVATIONS PREEMPTED.
2700 */
6708bb27 2701 if (!calling_it_nexus)
c66ac9db
NB		 2702 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2703 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2704 }
2705 spin_unlock(&pr_tmpl->registration_lock);
2706
6708bb27 2707 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2708 cmd->se_tfo->get_fabric_name());
c66ac9db 2709
459f213b 2710 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2711
2712 core_scsi3_pr_generation(dev);
2713 return 0;
2714}
2715
2716/*
2717 * Called with struct se_device->dev_reservation_lock held.
2718 */
2719static void __core_scsi3_complete_pro_preempt(
2720 struct se_device *dev,
2721 struct t10_pr_registration *pr_reg,
2722 struct list_head *preempt_and_abort_list,
2723 int type,
2724 int scope,
33ce6a87 2725 enum preempt_type preempt_type)
c66ac9db
NB		 2726{
2727 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2728 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2729 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2730
2731 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2732 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2733 /*
125d0119 2734 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2735 */
2736 if (dev->dev_pr_res_holder)
2737 __core_scsi3_complete_pro_release(dev, nacl,
6c3c9baa 2738 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2739
2740 dev->dev_pr_res_holder = pr_reg;
2741 pr_reg->pr_res_holder = 1;
2742 pr_reg->pr_res_type = type;
2743 pr_reg->pr_res_scope = scope;
2744
6708bb27 2745 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2746 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2747 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2748 core_scsi3_pr_dump_type(type),
2749 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2750 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2751 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2752 nacl->initiatorname, i_buf);
c66ac9db
NB		 2753 /*
2754 * For PREEMPT_AND_ABORT, add the preempting reservation's
2755 * struct t10_pr_registration to the list that will be compared
2756 * against received CDBs..
2757 */
2758 if (preempt_and_abort_list)
2759 list_add_tail(&pr_reg->pr_reg_abort_list,
2760 preempt_and_abort_list);
2761}
2762
2763static void core_scsi3_release_preempt_and_abort(
2764 struct list_head *preempt_and_abort_list,
2765 struct t10_pr_registration *pr_reg_holder)
2766{
2767 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2768
2769 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2770 pr_reg_abort_list) {
2771
2772 list_del(&pr_reg->pr_reg_abort_list);
2773 if (pr_reg_holder == pr_reg)
2774 continue;
2775 if (pr_reg->pr_res_holder) {
6708bb27 2776 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2777 continue;
2778 }
2779
2780 pr_reg->pr_reg_deve = NULL;
2781 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2782 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2783 }
2784}
2785
de103c93
CH		 2786static sense_reason_t
2787core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2788 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2789{
5951146d 2790 struct se_device *dev = cmd->se_dev;
c66ac9db 2791 struct se_node_acl *pr_reg_nacl;
e3d6f909 2792 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2793 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2794 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2795 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2796 u32 pr_res_mapped_lun = 0;
b6932ee3
SA		 2797 int all_reg = 0, calling_it_nexus = 0;
2798 bool sa_res_key_unmatched = sa_res_key != 0;
de103c93 2799 int prh_type = 0, prh_scope = 0;
c66ac9db 2800
de103c93
CH		 2801 if (!se_sess)
2802 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2803
5951146d 2804 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2805 se_sess);
6708bb27
AG		 2806 if (!pr_reg_n) {
2807 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2808 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2809 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2810 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2811 }
2812 if (pr_reg_n->pr_res_key != res_key) {
2813 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2814 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2815 }
2816 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2817 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2818 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2819 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2820 }
c66ac9db
NB		 2821
2822 spin_lock(&dev->dev_reservation_lock);
2823 pr_res_holder = dev->dev_pr_res_holder;
2824 if (pr_res_holder &&
2825 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2826 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2827 all_reg = 1;
2828
6708bb27 2829 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2830 spin_unlock(&dev->dev_reservation_lock);
2831 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2832 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2833 }
2834 /*
2835 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2836 *
2837 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2838 * persistent reservation holder or there is no persistent reservation
2839 * holder (i.e., there is no persistent reservation), then the device
2840 * server shall perform a preempt by doing the following in an
2841 * uninterrupted series of actions. (See below..)
2842 */
6708bb27 2843 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2844 /*
2845 * No existing or SA Reservation Key matching reservations..
2846 *
2847 * PROUT SA PREEMPT with All Registrant type reservations are
2848 * allowed to be processed without a matching SA Reservation Key
2849 */
2850 spin_lock(&pr_tmpl->registration_lock);
2851 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2852 &pr_tmpl->registration_list, pr_reg_list) {
2853 /*
2854 * Removing of registrations in non all registrants
2855 * type reservations without a matching SA reservation
2856 * key.
2857 *
2858 * a) Remove the registrations for all I_T nexuses
2859 * specified by the SERVICE ACTION RESERVATION KEY
2860 * field;
2861 * b) Ignore the contents of the SCOPE and TYPE fields;
2862 * c) Process tasks as defined in 5.7.1; and
2863 * d) Establish a unit attention condition for the
2864 * initiator port associated with every I_T nexus
2865 * that lost its registration other than the I_T
2866 * nexus on which the PERSISTENT RESERVE OUT command
2867 * was received, with the additional sense code set
2868 * to REGISTRATIONS PREEMPTED.
2869 */
6708bb27 2870 if (!all_reg) {
c66ac9db
NB		 2871 if (pr_reg->pr_res_key != sa_res_key)
2872 continue;
b6932ee3 2873 sa_res_key_unmatched = false;
c66ac9db
NB		 2874
2875 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2876 pr_reg_nacl = pr_reg->pr_reg_nacl;
2877 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2878 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2879 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2880 NULL, calling_it_nexus);
c66ac9db
NB		 2881 } else {
2882 /*
2883 * Case for any existing all registrants type
2884 * reservation, follow logic in spc4r17 section
2885 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2886 *
2887 * For a ZERO SA Reservation key, release
125d0119 2888 * all other registrations and do an implicit
c66ac9db
NB		 2889 * release of active persistent reservation.
2890 *
2891 * For a non-ZERO SA Reservation key, only
2892 * release the matching reservation key from
2893 * registrations.
2894 */
2895 if ((sa_res_key) &&
2896 (pr_reg->pr_res_key != sa_res_key))
2897 continue;
b6932ee3 2898 sa_res_key_unmatched = false;
c66ac9db
NB		 2899
2900 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2901 if (calling_it_nexus)
2902 continue;
2903
2904 pr_reg_nacl = pr_reg->pr_reg_nacl;
2905 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2906 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2907 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2908 NULL, 0);
c66ac9db 2909 }
6708bb27 2910 if (!calling_it_nexus)
c66ac9db
NB		 2911 core_scsi3_ua_allocate(pr_reg_nacl,
2912 pr_res_mapped_lun, 0x2A,
9e08e34e 2913 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2914 }
2915 spin_unlock(&pr_tmpl->registration_lock);
2916 /*
2917 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2918 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2919 * RESERVATION KEY field to a value that does not match any
2920 * registered reservation key, then the device server shall
2921 * complete the command with RESERVATION CONFLICT status.
2922 */
b6932ee3 2923 if (sa_res_key_unmatched) {
c66ac9db
NB		 2924 spin_unlock(&dev->dev_reservation_lock);
2925 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2926 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2927 }
2928 /*
2929 * For an existing all registrants type reservation
2930 * with a zero SA rservation key, preempt the existing
2931 * reservation with the new PR type and scope.
2932 */
2933 if (pr_res_holder && all_reg && !(sa_res_key)) {
2934 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2935 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2936 type, scope, preempt_type);
c66ac9db 2937
33ce6a87 2938 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2939 core_scsi3_release_preempt_and_abort(
2940 &preempt_and_abort_list, pr_reg_n);
2941 }
2942 spin_unlock(&dev->dev_reservation_lock);
2943
459f213b
AG		 2944 if (pr_tmpl->pr_aptpl_active)
2945 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2946
2947 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2948 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2949 return 0;
2950 }
2951 /*
2952 * The PREEMPTing SA reservation key matches that of the
2953 * existing persistent reservation, first, we check if
2954 * we are preempting our own reservation.
2955 * From spc4r17, section 5.7.11.4.3 Preempting
2956 * persistent reservations and registration handling
2957 *
2958 * If an all registrants persistent reservation is not
2959 * present, it is not an error for the persistent
2960 * reservation holder to preempt itself (i.e., a
2961 * PERSISTENT RESERVE OUT with a PREEMPT service action
2962 * or a PREEMPT AND ABORT service action with the
2963 * SERVICE ACTION RESERVATION KEY value equal to the
2964 * persistent reservation holder's reservation key that
2965 * is received from the persistent reservation holder).
2966 * In that case, the device server shall establish the
2967 * new persistent reservation and maintain the
2968 * registration.
2969 */
2970 prh_type = pr_res_holder->pr_res_type;
2971 prh_scope = pr_res_holder->pr_res_scope;
2972 /*
2973 * If the SERVICE ACTION RESERVATION KEY field identifies a
2974 * persistent reservation holder (see 5.7.10), the device
2975 * server shall perform a preempt by doing the following as
2976 * an uninterrupted series of actions:
2977 *
2978 * a) Release the persistent reservation for the holder
2979 * identified by the SERVICE ACTION RESERVATION KEY field;
2980 */
2981 if (pr_reg_n != pr_res_holder)
2982 __core_scsi3_complete_pro_release(dev,
6c3c9baa
NB		 2983 pr_res_holder->pr_reg_nacl,
2984 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2985 /*
2986 * b) Remove the registrations for all I_T nexuses identified
2987 * by the SERVICE ACTION RESERVATION KEY field, except the
2988 * I_T nexus that is being used for the PERSISTENT RESERVE
2989 * OUT command. If an all registrants persistent reservation
2990 * is present and the SERVICE ACTION RESERVATION KEY field
2991 * is set to zero, then all registrations shall be removed
2992 * except for that of the I_T nexus that is being used for
2993 * the PERSISTENT RESERVE OUT command;
2994 */
2995 spin_lock(&pr_tmpl->registration_lock);
2996 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2997 &pr_tmpl->registration_list, pr_reg_list) {
2998
2999 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3000 if (calling_it_nexus)
3001 continue;
3002
3003 if (pr_reg->pr_res_key != sa_res_key)
3004 continue;
3005
3006 pr_reg_nacl = pr_reg->pr_reg_nacl;
3007 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3008 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3009 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3010 calling_it_nexus);
3011 /*
3012 * e) Establish a unit attention condition for the initiator
3013 * port associated with every I_T nexus that lost its
3014 * persistent reservation and/or registration, with the
3015 * additional sense code set to REGISTRATIONS PREEMPTED;
3016 */
3017 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3018 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3019 }
3020 spin_unlock(&pr_tmpl->registration_lock);
3021 /*
3022 * c) Establish a persistent reservation for the preempting
3023 * I_T nexus using the contents of the SCOPE and TYPE fields;
3024 */
3025 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3026 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3027 type, scope, preempt_type);
c66ac9db
NB		 3028 /*
3029 * d) Process tasks as defined in 5.7.1;
3030 * e) See above..
3031 * f) If the type or scope has changed, then for every I_T nexus
3032 * whose reservation key was not removed, except for the I_T
3033 * nexus on which the PERSISTENT RESERVE OUT command was
3034 * received, the device server shall establish a unit
3035 * attention condition for the initiator port associated with
3036 * that I_T nexus, with the additional sense code set to
3037 * RESERVATIONS RELEASED. If the type or scope have not
3038 * changed, then no unit attention condition(s) shall be
3039 * established for this reason.
3040 */
3041 if ((prh_type != type) || (prh_scope != scope)) {
3042 spin_lock(&pr_tmpl->registration_lock);
3043 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3044 &pr_tmpl->registration_list, pr_reg_list) {
3045
3046 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3047 if (calling_it_nexus)
3048 continue;
3049
3050 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3051 pr_reg->pr_res_mapped_lun, 0x2A,
3052 ASCQ_2AH_RESERVATIONS_RELEASED);
3053 }
3054 spin_unlock(&pr_tmpl->registration_lock);
3055 }
3056 spin_unlock(&dev->dev_reservation_lock);
3057 /*
3058 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3059 * All received CDBs for the matching existing reservation and
3060 * registrations undergo ABORT_TASK logic.
3061 *
3062 * From there, core_scsi3_release_preempt_and_abort() will
3063 * release every registration in the list (which have already
3064 * been removed from the primary pr_reg list), except the
3065 * new persistent reservation holder, the calling Initiator Port.
3066 */
33ce6a87 3067 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3068 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3069 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3070 pr_reg_n);
3071 }
3072
459f213b
AG		 3073 if (pr_tmpl->pr_aptpl_active)
3074 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3075
3076 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3077 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3078 return 0;
3079}
3080
de103c93
CH		 3081static sense_reason_t
3082core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3083 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3084{
c66ac9db
NB		 3085 switch (type) {
3086 case PR_TYPE_WRITE_EXCLUSIVE:
3087 case PR_TYPE_EXCLUSIVE_ACCESS:
3088 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3089 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3090 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3091 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3092 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3093 sa_res_key, preempt_type);
c66ac9db 3094 default:
6708bb27 3095 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3096 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3097 return TCM_INVALID_CDB_FIELD;
c66ac9db 3098 }
c66ac9db
NB		 3099}
3100
3101
de103c93
CH		 3102static sense_reason_t
3103core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3104 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3105{
e3d6f909 3106 struct se_session *se_sess = cmd->se_sess;
5951146d 3107 struct se_device *dev = cmd->se_dev;
28168905 3108 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3109 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3110 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3111 struct se_port *se_port;
3112 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3113 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3114 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3115 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3116 unsigned char *buf;
c66ac9db 3117 unsigned char *initiator_str;
13ba564c 3118 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
c66ac9db 3119 u32 tid_len, tmp_tid_len;
d2843c17 3120 int new_reg = 0, type, scope, matching_iname;
de103c93 3121 sense_reason_t ret;
c66ac9db
NB		 3122 unsigned short rtpi;
3123 unsigned char proto_ident;
3124
6708bb27
AG		 3125 if (!se_sess || !se_lun) {
3126 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3127 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3128 }
de103c93 3129
c66ac9db
NB		 3130 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3131 se_tpg = se_sess->se_tpg;
e3d6f909 3132 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3133 /*
3134 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3135 * Register behaviors for a REGISTER AND MOVE service action
3136 *
3137 * Locate the existing *pr_reg via struct se_node_acl pointers
3138 */
5951146d 3139 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3140 se_sess);
6708bb27
AG		 3141 if (!pr_reg) {
3142 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3143 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3144 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3145 }
3146 /*
3147 * The provided reservation key much match the existing reservation key
3148 * provided during this initiator's I_T nexus registration.
3149 */
3150 if (res_key != pr_reg->pr_res_key) {
6708bb27 3151 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3152 " res_key: 0x%016Lx does not match existing SA REGISTER"
3153 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3154 ret = TCM_RESERVATION_CONFLICT;
3155 goto out_put_pr_reg;
c66ac9db
NB		 3156 }
3157 /*
3158 * The service active reservation key needs to be non zero
3159 */
6708bb27
AG		 3160 if (!sa_res_key) {
3161 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3162 " sa_res_key\n");
de103c93
CH		 3163 ret = TCM_INVALID_PARAMETER_LIST;
3164 goto out_put_pr_reg;
c66ac9db 3165 }
05d1c7c0 3166
c66ac9db
NB		 3167 /*
3168 * Determine the Relative Target Port Identifier where the reservation
3169 * will be moved to for the TransportID containing SCSI initiator WWN
3170 * information.
3171 */
4949314c 3172 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3173 if (!buf) {
3174 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3175 goto out_put_pr_reg;
3176 }
3177
c66ac9db
NB		 3178 rtpi = (buf[18] & 0xff) << 8;
3179 rtpi |= buf[19] & 0xff;
3180 tid_len = (buf[20] & 0xff) << 24;
3181 tid_len |= (buf[21] & 0xff) << 16;
3182 tid_len |= (buf[22] & 0xff) << 8;
3183 tid_len |= buf[23] & 0xff;
4949314c 3184 transport_kunmap_data_sg(cmd);
05d1c7c0 3185 buf = NULL;
c66ac9db
NB		 3186
3187 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3188 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3189 " does not equal CDB data_length: %u\n", tid_len,
3190 cmd->data_length);
de103c93
CH		 3191 ret = TCM_INVALID_PARAMETER_LIST;
3192 goto out_put_pr_reg;
c66ac9db
NB		 3193 }
3194
3195 spin_lock(&dev->se_port_lock);
3196 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3197 if (se_port->sep_rtpi != rtpi)
3198 continue;
3199 dest_se_tpg = se_port->sep_tpg;
6708bb27 3200 if (!dest_se_tpg)
c66ac9db 3201 continue;
e3d6f909 3202 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3203 if (!dest_tf_ops)
c66ac9db
NB		 3204 continue;
3205
33940d09 3206 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
c66ac9db
NB		 3207 spin_unlock(&dev->se_port_lock);
3208
de103c93 3209 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3210 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db 3211 " for dest_se_tpg\n");
33940d09 3212 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
de103c93
CH		 3213 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3214 goto out_put_pr_reg;
c66ac9db
NB		 3215 }
3216
3217 spin_lock(&dev->se_port_lock);
3218 break;
3219 }
3220 spin_unlock(&dev->se_port_lock);
3221
6708bb27
AG		 3222 if (!dest_se_tpg || !dest_tf_ops) {
3223 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3224 " fabric ops from Relative Target Port Identifier:"
3225 " %hu\n", rtpi);
de103c93
CH		 3226 ret = TCM_INVALID_PARAMETER_LIST;
3227 goto out_put_pr_reg;
c66ac9db 3228 }
05d1c7c0 3229
4949314c 3230 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3231 if (!buf) {
3232 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3233 goto out_put_pr_reg;
3234 }
c66ac9db 3235 proto_ident = (buf[24] & 0x0f);
8b1e1244 3236
6708bb27 3237 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3238 " 0x%02x\n", proto_ident);
8b1e1244 3239
c66ac9db 3240 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3241 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3242 " proto_ident: 0x%02x does not match ident: 0x%02x"
3243 " from fabric: %s\n", proto_ident,
3244 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3245 dest_tf_ops->get_fabric_name());
de103c93 3246 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3247 goto out;
3248 }
3249 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3250 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3251 " containg a valid tpg_parse_pr_out_transport_id"
3252 " function pointer\n");
de103c93 3253 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3254 goto out;
3255 }
3256 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3257 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3258 if (!initiator_str) {
3259 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3260 " initiator_str from Transport ID\n");
de103c93 3261 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3262 goto out;
3263 }
3264
4949314c 3265 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3266 buf = NULL;
3267
6708bb27 3268 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3269 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3270 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3271 iport_ptr : "");
3272 /*
3273 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3274 * action specifies a TransportID that is the same as the initiator port
3275 * of the I_T nexus for the command received, then the command shall
3276 * be terminated with CHECK CONDITION status, with the sense key set to
3277 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3278 * IN PARAMETER LIST.
3279 */
3280 pr_reg_nacl = pr_reg->pr_reg_nacl;
3281 matching_iname = (!strcmp(initiator_str,
3282 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3283 if (!matching_iname)
c66ac9db
NB		 3284 goto after_iport_check;
3285
6708bb27
AG		 3286 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3287 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3288 " matches: %s on received I_T Nexus\n", initiator_str,
3289 pr_reg_nacl->initiatorname);
de103c93 3290 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3291 goto out;
3292 }
6708bb27
AG		 3293 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3294 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3295 " matches: %s %s on received I_T Nexus\n",
3296 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3297 pr_reg->pr_reg_isid);
de103c93 3298 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3299 goto out;
3300 }
3301after_iport_check:
3302 /*
3303 * Locate the destination struct se_node_acl from the received Transport ID
3304 */
28638887 3305 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3306 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3307 initiator_str);
33940d09
JE		 3308 if (dest_node_acl)
3309 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 3310 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3311
6708bb27
AG		 3312 if (!dest_node_acl) {
3313 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3314 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3315 initiator_str);
de103c93 3316 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3317 goto out;
3318 }
de103c93
CH		 3319
3320 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3321 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db 3322 " dest_node_acl\n");
33940d09 3323 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 3324 dest_node_acl = NULL;
de103c93 3325 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3326 goto out;
3327 }
8b1e1244 3328
6708bb27 3329 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3330 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3331 dest_node_acl->initiatorname);
8b1e1244 3332
c66ac9db
NB		 3333 /*
3334 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3335 * PORT IDENTIFIER.
3336 */
3337 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3338 if (!dest_se_deve) {
3339 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3340 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3341 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3342 goto out;
3343 }
3344
de103c93 3345 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3346 pr_err("core_scsi3_lunacl_depend_item() failed\n");
33940d09 3347 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db 3348 dest_se_deve = NULL;
de103c93 3349 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3350 goto out;
3351 }
8b1e1244 3352
6708bb27 3353 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3354 " ACL for dest_se_deve->mapped_lun: %u\n",
3355 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3356 dest_se_deve->mapped_lun);
8b1e1244 3357
c66ac9db
NB		 3358 /*
3359 * A persistent reservation needs to already existing in order to
3360 * successfully complete the REGISTER_AND_MOVE service action..
3361 */
3362 spin_lock(&dev->dev_reservation_lock);
3363 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3364 if (!pr_res_holder) {
3365 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3366 " currently held\n");
3367 spin_unlock(&dev->dev_reservation_lock);
de103c93 3368 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3369 goto out;
3370 }
3371 /*
3372 * The received on I_T Nexus must be the reservation holder.
3373 *
3374 * From spc4r17 section 5.7.8 Table 50 --
3375 * Register behaviors for a REGISTER AND MOVE service action
3376 */
3377 if (pr_res_holder != pr_reg) {
6708bb27 3378 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3379 " Nexus is not reservation holder\n");
3380 spin_unlock(&dev->dev_reservation_lock);
de103c93 3381 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3382 goto out;
3383 }
3384 /*
3385 * From spc4r17 section 5.7.8: registering and moving reservation
3386 *
3387 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3388 * action is received and the established persistent reservation is a
3389 * Write Exclusive - All Registrants type or Exclusive Access -
3390 * All Registrants type reservation, then the command shall be completed
3391 * with RESERVATION CONFLICT status.
3392 */
3393 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3394 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3396 " reservation for type: %s\n",
3397 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3398 spin_unlock(&dev->dev_reservation_lock);
de103c93 3399 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3400 goto out;
3401 }
3402 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3403 /*
3404 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3405 */
3406 type = pr_res_holder->pr_res_type;
3407 scope = pr_res_holder->pr_res_type;
3408 /*
3409 * c) Associate the reservation key specified in the SERVICE ACTION
3410 * RESERVATION KEY field with the I_T nexus specified as the
3411 * destination of the register and move, where:
3412 * A) The I_T nexus is specified by the TransportID and the
3413 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3414 * B) Regardless of the TransportID format used, the association for
3415 * the initiator port is based on either the initiator port name
3416 * (see 3.1.71) on SCSI transport protocols where port names are
3417 * required or the initiator port identifier (see 3.1.70) on SCSI
3418 * transport protocols where port names are not required;
3419 * d) Register the reservation key specified in the SERVICE ACTION
3420 * RESERVATION KEY field;
3421 * e) Retain the reservation key specified in the SERVICE ACTION
3422 * RESERVATION KEY field and associated information;
3423 *
3424 * Also, It is not an error for a REGISTER AND MOVE service action to
3425 * register an I_T nexus that is already registered with the same
3426 * reservation key or a different reservation key.
3427 */
3428 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3429 iport_ptr);
6708bb27 3430 if (!dest_pr_reg) {
de103c93 3431 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3432 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3433 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3434 spin_unlock(&dev->dev_reservation_lock);
de103c93 3435 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3436 goto out;
3437 }
3438 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3439 iport_ptr);
3440 new_reg = 1;
3441 }
3442 /*
3443 * f) Release the persistent reservation for the persistent reservation
3444 * holder (i.e., the I_T nexus on which the
3445 */
3446 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 3447 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3448 /*
3449 * g) Move the persistent reservation to the specified I_T nexus using
3450 * the same scope and type as the persistent reservation released in
3451 * item f); and
3452 */
3453 dev->dev_pr_res_holder = dest_pr_reg;
3454 dest_pr_reg->pr_res_holder = 1;
3455 dest_pr_reg->pr_res_type = type;
3456 pr_reg->pr_res_scope = scope;
d2843c17 3457 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3458 /*
3459 * Increment PRGeneration for existing registrations..
3460 */
6708bb27 3461 if (!new_reg)
c66ac9db
NB		 3462 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3463 spin_unlock(&dev->dev_reservation_lock);
3464
6708bb27 3465 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3466 " created new reservation holder TYPE: %s on object RTPI:"
3467 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3468 core_scsi3_pr_dump_type(type), rtpi,
3469 dest_pr_reg->pr_res_generation);
6708bb27 3470 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3471 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3472 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3473 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3474 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3475 iport_ptr : "");
3476 /*
3477 * It is now safe to release configfs group dependencies for destination
3478 * of Transport ID Initiator Device/Port Identifier
3479 */
3480 core_scsi3_lunacl_undepend_item(dest_se_deve);
3481 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3482 core_scsi3_tpg_undepend_item(dest_se_tpg);
3483 /*
3484 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3485 * nexus on which PERSISTENT RESERVE OUT command was received.
3486 */
3487 if (unreg) {
3488 spin_lock(&pr_tmpl->registration_lock);
3489 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3490 spin_unlock(&pr_tmpl->registration_lock);
3491 } else
3492 core_scsi3_put_pr_reg(pr_reg);
3493
459f213b 3494 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3495
4949314c 3496 transport_kunmap_data_sg(cmd);
05d1c7c0 3497
c66ac9db
NB		 3498 core_scsi3_put_pr_reg(dest_pr_reg);
3499 return 0;
3500out:
05d1c7c0 3501 if (buf)
4949314c 3502 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3503 if (dest_se_deve)
3504 core_scsi3_lunacl_undepend_item(dest_se_deve);
3505 if (dest_node_acl)
3506 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3507 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3508
3509out_put_pr_reg:
c66ac9db
NB		 3510 core_scsi3_put_pr_reg(pr_reg);
3511 return ret;
3512}
3513
3514static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3515{
3516 unsigned int __v1, __v2;
3517
3518 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3519 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3520
3521 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3522}
3523
3524/*
3525 * See spc4r17 section 6.14 Table 170
3526 */
de103c93
CH		 3527sense_reason_t
3528target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3529{
92404e60 3530 struct se_device *dev = cmd->se_dev;
617c0e06 3531 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3532 unsigned char *buf;
c66ac9db
NB		 3533 u64 res_key, sa_res_key;
3534 int sa, scope, type, aptpl;
3535 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3536 sense_reason_t ret;
617c0e06
CH		 3537
3538 /*
3539 * Following spc2r20 5.5.1 Reservations overview:
3540 *
3541 * If a logical unit has been reserved by any RESERVE command and is
3542 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3543 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3544 * initiator or service action and shall terminate with a RESERVATION
3545 * CONFLICT status.
3546 */
0fd97ccf 3547 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3548 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3549 " SPC-2 reservation is held, returning"
3550 " RESERVATION_CONFLICT\n");
de103c93 3551 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3552 }
3553
c66ac9db
NB		 3554 /*
3555 * FIXME: A NULL struct se_session pointer means an this is not coming from
3556 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3557 */
de103c93
CH		 3558 if (!cmd->se_sess)
3559 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3560
3561 if (cmd->data_length < 24) {
6708bb27 3562 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3563 " length too small: %u\n", cmd->data_length);
de103c93 3564 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3565 }
de103c93 3566
c66ac9db
NB		 3567 /*
3568 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3569 */
3570 sa = (cdb[1] & 0x1f);
3571 scope = (cdb[2] & 0xf0);
3572 type = (cdb[2] & 0x0f);
05d1c7c0 3573
4949314c 3574 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3575 if (!buf)
3576 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3577
c66ac9db
NB		 3578 /*
3579 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3580 */
3581 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3582 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3583 /*
3584 * REGISTER_AND_MOVE uses a different SA parameter list containing
3585 * SCSI TransportIDs.
3586 */
3587 if (sa != PRO_REGISTER_AND_MOVE) {
3588 spec_i_pt = (buf[20] & 0x08);
3589 all_tg_pt = (buf[20] & 0x04);
3590 aptpl = (buf[20] & 0x01);
3591 } else {
3592 aptpl = (buf[17] & 0x01);
3593 unreg = (buf[17] & 0x02);
3594 }
92404e60
NB		 3595 /*
3596 * If the backend device has been configured to force APTPL metadata
3597 * write-out, go ahead and propigate aptpl=1 down now.
3598 */
3599 if (dev->dev_attrib.force_pr_aptpl)
3600 aptpl = 1;
3601
4949314c 3602 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3603 buf = NULL;
3604
c66ac9db
NB		 3605 /*
3606 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3607 */
de103c93
CH		 3608 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3609 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3610
c66ac9db
NB		 3611 /*
3612 * From spc4r17 section 6.14:
3613 *
3614 * If the SPEC_I_PT bit is set to zero, the service action is not
3615 * REGISTER AND MOVE, and the parameter list length is not 24, then
3616 * the command shall be terminated with CHECK CONDITION status, with
3617 * the sense key set to ILLEGAL REQUEST, and the additional sense
3618 * code set to PARAMETER LIST LENGTH ERROR.
3619 */
6708bb27 3620 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3621 (cmd->data_length != 24)) {
6708bb27 3622 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3623 " list length: %u\n", cmd->data_length);
de103c93 3624 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3625 }
de103c93 3626
c66ac9db
NB		 3627 /*
3628 * (core_scsi3_emulate_pro_* function parameters
3629 * are defined by spc4r17 Table 174:
3630 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3631 */
3632 switch (sa) {
3633 case PRO_REGISTER:
d29a5b6a 3634 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3635 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3636 break;
c66ac9db 3637 case PRO_RESERVE:
d29a5b6a
CH		 3638 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3639 break;
c66ac9db 3640 case PRO_RELEASE:
d29a5b6a
CH		 3641 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3642 break;
c66ac9db 3643 case PRO_CLEAR:
d29a5b6a
CH		 3644 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3645 break;
c66ac9db 3646 case PRO_PREEMPT:
d29a5b6a 3647 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3648 res_key, sa_res_key, PREEMPT);
d29a5b6a 3649 break;
c66ac9db 3650 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3651 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3652 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3653 break;
c66ac9db 3654 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3655 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3656 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3657 break;
c66ac9db 3658 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3659 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3660 sa_res_key, aptpl, unreg);
d29a5b6a 3661 break;
c66ac9db 3662 default:
6708bb27 3663 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3664 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3665 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3666 }
3667
6bb35e00
CH		 3668 if (!ret)
3669 target_complete_cmd(cmd, GOOD);
d29a5b6a 3670 return ret;
c66ac9db
NB		 3671}
3672
3673/*
3674 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3675 *
3676 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3677 */
de103c93
CH		 3678static sense_reason_t
3679core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3680{
0fd97ccf 3681 struct se_device *dev = cmd->se_dev;
c66ac9db 3682 struct t10_pr_registration *pr_reg;
05d1c7c0 3683 unsigned char *buf;
c66ac9db
NB		 3684 u32 add_len = 0, off = 8;
3685
3686 if (cmd->data_length < 8) {
6708bb27 3687 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3688 " too small\n", cmd->data_length);
de103c93 3689 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3690 }
3691
4949314c 3692 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3693 if (!buf)
3694 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3695
0fd97ccf
CH		 3696 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3697 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3698 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3699 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3700
0fd97ccf
CH		 3701 spin_lock(&dev->t10_pr.registration_lock);
3702 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3703 pr_reg_list) {
3704 /*
3705 * Check for overflow of 8byte PRI READ_KEYS payload and
3706 * next reservation key list descriptor.
3707 */
3708 if ((add_len + 8) > (cmd->data_length - 8))
3709 break;
3710
3711 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3712 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3713 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3714 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3715 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3716 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3717 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3718 buf[off++] = (pr_reg->pr_res_key & 0xff);
3719
3720 add_len += 8;
3721 }
0fd97ccf 3722 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3723
3724 buf[4] = ((add_len >> 24) & 0xff);
3725 buf[5] = ((add_len >> 16) & 0xff);
3726 buf[6] = ((add_len >> 8) & 0xff);
3727 buf[7] = (add_len & 0xff);
3728
4949314c 3729 transport_kunmap_data_sg(cmd);
05d1c7c0 3730
c66ac9db
NB		 3731 return 0;
3732}
3733
3734/*
3735 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3736 *
3737 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3738 */
de103c93
CH		 3739static sense_reason_t
3740core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3741{
0fd97ccf 3742 struct se_device *dev = cmd->se_dev;
c66ac9db 3743 struct t10_pr_registration *pr_reg;
05d1c7c0 3744 unsigned char *buf;
c66ac9db
NB		 3745 u64 pr_res_key;
3746 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3747
3748 if (cmd->data_length < 8) {
6708bb27 3749 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3750 " too small\n", cmd->data_length);
de103c93 3751 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3752 }
3753
4949314c 3754 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3755 if (!buf)
3756 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3757
0fd97ccf
CH		 3758 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3759 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3760 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3761 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3762
0fd97ccf
CH		 3763 spin_lock(&dev->dev_reservation_lock);
3764 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3765 if (pr_reg) {
c66ac9db
NB		 3766 /*
3767 * Set the hardcoded Additional Length
3768 */
3769 buf[4] = ((add_len >> 24) & 0xff);
3770 buf[5] = ((add_len >> 16) & 0xff);
3771 buf[6] = ((add_len >> 8) & 0xff);
3772 buf[7] = (add_len & 0xff);
3773
05d1c7c0
AG		 3774 if (cmd->data_length < 22)
3775 goto err;
3776
c66ac9db
NB		 3777 /*
3778 * Set the Reservation key.
3779 *
3780 * From spc4r17, section 5.7.10:
3781 * A persistent reservation holder has its reservation key
3782 * returned in the parameter data from a PERSISTENT
3783 * RESERVE IN command with READ RESERVATION service action as
3784 * follows:
3785 * a) For a persistent reservation of the type Write Exclusive
3786 * - All Registrants or Exclusive Access ­ All Regitrants,
3787 * the reservation key shall be set to zero; or
3788 * b) For all other persistent reservation types, the
3789 * reservation key shall be set to the registered
3790 * reservation key for the I_T nexus that holds the
3791 * persistent reservation.
3792 */
3793 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3794 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3795 pr_res_key = 0;
3796 else
3797 pr_res_key = pr_reg->pr_res_key;
3798
3799 buf[8] = ((pr_res_key >> 56) & 0xff);
3800 buf[9] = ((pr_res_key >> 48) & 0xff);
3801 buf[10] = ((pr_res_key >> 40) & 0xff);
3802 buf[11] = ((pr_res_key >> 32) & 0xff);
3803 buf[12] = ((pr_res_key >> 24) & 0xff);
3804 buf[13] = ((pr_res_key >> 16) & 0xff);
3805 buf[14] = ((pr_res_key >> 8) & 0xff);
3806 buf[15] = (pr_res_key & 0xff);
3807 /*
3808 * Set the SCOPE and TYPE
3809 */
3810 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3811 (pr_reg->pr_res_type & 0x0f);
3812 }
05d1c7c0
AG		 3813
3814err:
0fd97ccf 3815 spin_unlock(&dev->dev_reservation_lock);
4949314c 3816 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3817
3818 return 0;
3819}
3820
3821/*
3822 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3823 *
3824 * See spc4r17 section 6.13.4 Table 165
3825 */
de103c93
CH		 3826static sense_reason_t
3827core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3828{
5951146d 3829 struct se_device *dev = cmd->se_dev;
0fd97ccf 3830 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3831 unsigned char *buf;
c66ac9db
NB		 3832 u16 add_len = 8; /* Hardcoded to 8. */
3833
3834 if (cmd->data_length < 6) {
6708bb27 3835 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3836 " %u too small\n", cmd->data_length);
de103c93 3837 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3838 }
3839
4949314c 3840 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3841 if (!buf)
3842 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3843
c435285d 3844 buf[0] = ((add_len >> 8) & 0xff);
c66ac9db
NB		 3845 buf[1] = (add_len & 0xff);
3846 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3847 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3848 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3849 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3850 /*
3851 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3852 * set the TMV: Task Mask Valid bit.
3853 */
3854 buf[3] |= 0x80;
3855 /*
3856 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3857 */
3858 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3859 /*
3860 * PTPL_A: Persistence across Target Power Loss Active bit
3861 */
3862 if (pr_tmpl->pr_aptpl_active)
3863 buf[3] |= 0x01;
3864 /*
3865 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3866 */
3867 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3868 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3869 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3870 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3871 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3872 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3873
4949314c 3874 transport_kunmap_data_sg(cmd);
05d1c7c0 3875
c66ac9db
NB		 3876 return 0;
3877}
3878
3879/*
3880 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3881 *
3882 * See spc4r17 section 6.13.5 Table 168 and 169
3883 */
de103c93
CH		 3884static sense_reason_t
3885core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3886{
0fd97ccf 3887 struct se_device *dev = cmd->se_dev;
c66ac9db 3888 struct se_node_acl *se_nacl;
c66ac9db
NB		 3889 struct se_portal_group *se_tpg;
3890 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3891 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3892 unsigned char *buf;
c66ac9db
NB		 3893 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3894 u32 off = 8; /* off into first Full Status descriptor */
d16ca7c5
NB		 3895 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3896 bool all_reg = false;
c66ac9db
NB		 3897
3898 if (cmd->data_length < 8) {
6708bb27 3899 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3900 " too small\n", cmd->data_length);
de103c93 3901 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3902 }
3903
4949314c 3904 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3905 if (!buf)
3906 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3907
0fd97ccf
CH		 3908 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3909 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3910 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3911 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3912
d16ca7c5
NB		 3913 spin_lock(&dev->dev_reservation_lock);
3914 if (dev->dev_pr_res_holder) {
3915 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3916
3917 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3918 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3919 all_reg = true;
3920 pr_res_type = pr_holder->pr_res_type;
3921 pr_res_scope = pr_holder->pr_res_scope;
3922 }
3923 }
3924 spin_unlock(&dev->dev_reservation_lock);
3925
c66ac9db
NB		 3926 spin_lock(&pr_tmpl->registration_lock);
3927 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3928 &pr_tmpl->registration_list, pr_reg_list) {
3929
3930 se_nacl = pr_reg->pr_reg_nacl;
3931 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3932 add_desc_len = 0;
3933
33940d09 3934 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3935 spin_unlock(&pr_tmpl->registration_lock);
3936 /*
3937 * Determine expected length of $FABRIC_MOD specific
3938 * TransportID full status descriptor..
3939 */
e3d6f909 3940 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 3941 se_tpg, se_nacl, pr_reg, &format_code);
3942
3943 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 3944 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3945 " out of buffer: %d\n", cmd->data_length);
3946 spin_lock(&pr_tmpl->registration_lock);
33940d09 3947 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3948 break;
3949 }
3950 /*
3951 * Set RESERVATION KEY
3952 */
3953 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3954 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3955 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3956 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3957 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3958 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3959 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3960 buf[off++] = (pr_reg->pr_res_key & 0xff);
3961 off += 4; /* Skip Over Reserved area */
3962
3963 /*
3964 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3965 */
3966 if (pr_reg->pr_reg_all_tg_pt)
3967 buf[off] = 0x02;
3968 /*
3969 * The struct se_lun pointer will be present for the
3970 * reservation holder for PR_HOLDER bit.
3971 *
3972 * Also, if this registration is the reservation
d16ca7c5
NB		 3973 * holder or there is an All Registrants reservation
3974 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 3975 */
3976 if (pr_reg->pr_res_holder) {
3977 buf[off++] |= 0x01;
3978 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3979 (pr_reg->pr_res_type & 0x0f);
d16ca7c5
NB		 3980 } else if (all_reg) {
3981 buf[off++] |= 0x01;
3982 buf[off++] = (pr_res_scope & 0xf0) |
3983 (pr_res_type & 0x0f);
3984 } else {
c66ac9db 3985 off += 2;
d16ca7c5 3986 }
c66ac9db
NB		 3987
3988 off += 4; /* Skip over reserved area */
3989 /*
3990 * From spc4r17 6.3.15:
3991 *
3992 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3993 * IDENTIFIER field contains the relative port identifier (see
3994 * 3.1.120) of the target port that is part of the I_T nexus
3995 * described by this full status descriptor. If the ALL_TG_PT
3996 * bit is set to one, the contents of the RELATIVE TARGET PORT
3997 * IDENTIFIER field are not defined by this standard.
3998 */
6708bb27 3999 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 4000 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4001
4002 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4003 buf[off++] = (port->sep_rtpi & 0xff);
4004 } else
35d1efe8 4005 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 4006
4007 /*
4008 * Now, have the $FABRIC_MOD fill in the protocol identifier
4009 */
e3d6f909 4010 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 4011 se_nacl, pr_reg, &format_code, &buf[off+4]);
4012
4013 spin_lock(&pr_tmpl->registration_lock);
33940d09 4014 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 4015 /*
4016 * Set the ADDITIONAL DESCRIPTOR LENGTH
4017 */
4018 buf[off++] = ((desc_len >> 24) & 0xff);
4019 buf[off++] = ((desc_len >> 16) & 0xff);
4020 buf[off++] = ((desc_len >> 8) & 0xff);
4021 buf[off++] = (desc_len & 0xff);
4022 /*
4023 * Size of full desctipor header minus TransportID
4024 * containing $FABRIC_MOD specific) initiator device/port
4025 * WWN information.
4026 *
4027 * See spc4r17 Section 6.13.5 Table 169
4028 */
4029 add_desc_len = (24 + desc_len);
4030
4031 off += desc_len;
4032 add_len += add_desc_len;
4033 }
4034 spin_unlock(&pr_tmpl->registration_lock);
4035 /*
4036 * Set ADDITIONAL_LENGTH
4037 */
4038 buf[4] = ((add_len >> 24) & 0xff);
4039 buf[5] = ((add_len >> 16) & 0xff);
4040 buf[6] = ((add_len >> 8) & 0xff);
4041 buf[7] = (add_len & 0xff);
4042
4949314c 4043 transport_kunmap_data_sg(cmd);
05d1c7c0 4044
c66ac9db
NB		 4045 return 0;
4046}
4047
de103c93
CH		 4048sense_reason_t
4049target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4050{
de103c93 4051 sense_reason_t ret;
e76a35d6 4052
c66ac9db
NB		 4053 /*
4054 * Following spc2r20 5.5.1 Reservations overview:
4055 *
4056 * If a logical unit has been reserved by any RESERVE command and is
4057 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4058 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4059 * initiator or service action and shall terminate with a RESERVATION
4060 * CONFLICT status.
4061 */
0fd97ccf 4062 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4063 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4064 " SPC-2 reservation is held, returning"
4065 " RESERVATION_CONFLICT\n");
de103c93 4066 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4067 }
4068
617c0e06
CH		 4069 switch (cmd->t_task_cdb[1] & 0x1f) {
4070 case PRI_READ_KEYS:
d29a5b6a
CH		 4071 ret = core_scsi3_pri_read_keys(cmd);
4072 break;
617c0e06 4073 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4074 ret = core_scsi3_pri_read_reservation(cmd);
4075 break;
617c0e06 4076 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4077 ret = core_scsi3_pri_report_capabilities(cmd);
4078 break;
617c0e06 4079 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4080 ret = core_scsi3_pri_read_full_status(cmd);
4081 break;
617c0e06
CH		 4082 default:
4083 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4084 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4085 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4086 }
4087
6bb35e00
CH		 4088 if (!ret)
4089 target_complete_cmd(cmd, GOOD);
d29a5b6a 4090 return ret;
c66ac9db
NB		 4091}
4092
de103c93
CH		 4093sense_reason_t
4094target_check_reservation(struct se_cmd *cmd)
c66ac9db 4095{
d977f437 4096 struct se_device *dev = cmd->se_dev;
de103c93 4097 sense_reason_t ret;
c66ac9db 4098
d977f437
CH		 4099 if (!cmd->se_sess)
4100 return 0;
4101 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4102 return 0;
4103 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4104 return 0;
c66ac9db 4105
d977f437
CH		 4106 spin_lock(&dev->dev_reservation_lock);
4107 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4108 ret = target_scsi2_reservation_check(cmd);
4109 else
4110 ret = target_scsi3_pr_reservation_check(cmd);
4111 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4112
d977f437 4113 return ret;
c66ac9db 4114}
Linux kernel - Deliverables
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