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target: Drop duplicate + unused se_dev_check_wce
[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 38
e26d99ae 39#include "target_core_internal.h"
c66ac9db
NB		 40#include "target_core_pr.h"
41#include "target_core_ua.h"
42
43/*
44 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
45 */
46struct pr_transport_id_holder {
c66ac9db
NB		 47 struct t10_pr_registration *dest_pr_reg;
48 struct se_portal_group *dest_tpg;
49 struct se_node_acl *dest_node_acl;
79dc9c9e 50 struct se_dev_entry *dest_se_deve;
c66ac9db
NB		 51 struct list_head dest_list;
52};
53
d2843c17 54void core_pr_dump_initiator_port(
c66ac9db
NB		 55 struct t10_pr_registration *pr_reg,
56 char *buf,
57 u32 size)
58{
6708bb27 59 if (!pr_reg->isid_present_at_reg)
d2843c17 60 buf[0] = '\0';
c66ac9db 61
d2843c17 62 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
c66ac9db
NB		 63}
64
33ce6a87
AG		 65enum register_type {
66 REGISTER,
67 REGISTER_AND_IGNORE_EXISTING_KEY,
68 REGISTER_AND_MOVE,
69};
70
71enum preempt_type {
72 PREEMPT,
73 PREEMPT_AND_ABORT,
74};
75
c66ac9db 76static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
6c3c9baa 77 struct t10_pr_registration *, int, int);
c66ac9db 78
e673dc92
IT		 79static int is_reservation_holder(
80 struct t10_pr_registration *pr_res_holder,
81 struct t10_pr_registration *pr_reg)
82{
83 int pr_res_type;
84
85 if (pr_res_holder) {
86 pr_res_type = pr_res_holder->pr_res_type;
87
88 return pr_res_holder == pr_reg ||
89 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
90 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
91 }
92 return 0;
93}
94
de103c93
CH		 95static sense_reason_t
96target_scsi2_reservation_check(struct se_cmd *cmd)
c66ac9db 97{
d977f437
CH		 98 struct se_device *dev = cmd->se_dev;
99 struct se_session *sess = cmd->se_sess;
100
101 switch (cmd->t_task_cdb[0]) {
c66ac9db
NB		 102 case INQUIRY:
103 case RELEASE:
104 case RELEASE_10:
105 return 0;
106 default:
d977f437 107 break;
c66ac9db
NB		 108 }
109
d977f437 110 if (!dev->dev_reserved_node_acl || !sess)
c66ac9db
NB		 111 return 0;
112
d977f437 113 if (dev->dev_reserved_node_acl != sess->se_node_acl)
de103c93 114 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 115
116 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
117 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
de103c93 118 return TCM_RESERVATION_CONFLICT;
c66ac9db 119 }
c66ac9db 120
d977f437 121 return 0;
c66ac9db
NB		 122}
123
eacac00c
CH		 124static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
125 struct se_node_acl *, struct se_session *);
126static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
127
087a03b3 128static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
eacac00c
CH		 129{
130 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 131 struct se_device *dev = cmd->se_dev;
eacac00c 132 struct t10_pr_registration *pr_reg;
0fd97ccf 133 struct t10_reservation *pr_tmpl = &dev->t10_pr;
eacac00c
CH		 134 int conflict = 0;
135
eacac00c
CH		 136 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
137 se_sess);
138 if (pr_reg) {
139 /*
140 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
141 * behavior
142 *
143 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
144 * status, but no reservation shall be established and the
145 * persistent reservation shall not be changed, if the command
146 * is received from a) and b) below.
147 *
148 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
149 * status, but the persistent reservation shall not be released,
150 * if the command is received from a) and b)
151 *
152 * a) An I_T nexus that is a persistent reservation holder; or
153 * b) An I_T nexus that is registered if a registrants only or
154 * all registrants type persistent reservation is present.
155 *
156 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
157 * RELEASE(6) command, or RELEASE(10) command shall be processed
158 * as defined in SPC-2.
159 */
160 if (pr_reg->pr_res_holder) {
161 core_scsi3_put_pr_reg(pr_reg);
087a03b3 162 return 1;
eacac00c
CH		 163 }
164 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
165 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
166 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
168 core_scsi3_put_pr_reg(pr_reg);
087a03b3 169 return 1;
eacac00c
CH		 170 }
171 core_scsi3_put_pr_reg(pr_reg);
172 conflict = 1;
173 } else {
174 /*
175 * Following spc2r20 5.5.1 Reservations overview:
176 *
177 * If a logical unit has executed a PERSISTENT RESERVE OUT
178 * command with the REGISTER or the REGISTER AND IGNORE
179 * EXISTING KEY service action and is still registered by any
180 * initiator, all RESERVE commands and all RELEASE commands
181 * regardless of initiator shall conflict and shall terminate
182 * with a RESERVATION CONFLICT status.
183 */
184 spin_lock(&pr_tmpl->registration_lock);
185 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
186 spin_unlock(&pr_tmpl->registration_lock);
187 }
188
189 if (conflict) {
190 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
191 " while active SPC-3 registrations exist,"
192 " returning RESERVATION_CONFLICT\n");
087a03b3 193 return -EBUSY;
eacac00c
CH		 194 }
195
087a03b3 196 return 0;
eacac00c
CH		 197}
198
de103c93
CH		 199sense_reason_t
200target_scsi2_reservation_release(struct se_cmd *cmd)
c66ac9db
NB		 201{
202 struct se_device *dev = cmd->se_dev;
203 struct se_session *sess = cmd->se_sess;
609234e3 204 struct se_portal_group *tpg;
de103c93 205 int rc;
c66ac9db 206
609234e3 207 if (!sess || !sess->se_tpg)
d29a5b6a 208 goto out;
087a03b3
NB		 209 rc = target_check_scsi2_reservation_conflict(cmd);
210 if (rc == 1)
d29a5b6a 211 goto out;
de103c93
CH		 212 if (rc < 0)
213 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 214
215 spin_lock(&dev->dev_reservation_lock);
d29a5b6a
CH		 216 if (!dev->dev_reserved_node_acl || !sess)
217 goto out_unlock;
218
219 if (dev->dev_reserved_node_acl != sess->se_node_acl)
220 goto out_unlock;
c66ac9db 221
edc318d9
BK		 222 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
223 goto out_unlock;
224
c66ac9db 225 dev->dev_reserved_node_acl = NULL;
0fd97ccf
CH		 226 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
227 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
c66ac9db 228 dev->dev_res_bin_isid = 0;
0fd97ccf 229 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 230 }
609234e3 231 tpg = sess->se_tpg;
6708bb27 232 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
e3d6f909 233 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
29a05dee 234 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
c66ac9db 235 sess->se_node_acl->initiatorname);
c66ac9db 236
d29a5b6a
CH		 237out_unlock:
238 spin_unlock(&dev->dev_reservation_lock);
239out:
de103c93
CH		 240 target_complete_cmd(cmd, GOOD);
241 return 0;
c66ac9db
NB		 242}
243
de103c93
CH		 244sense_reason_t
245target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 246{
247 struct se_device *dev = cmd->se_dev;
248 struct se_session *sess = cmd->se_sess;
609234e3 249 struct se_portal_group *tpg;
de103c93
CH		 250 sense_reason_t ret = 0;
251 int rc;
c66ac9db 252
a1d8b49a
AG		 253 if ((cmd->t_task_cdb[1] & 0x01) &&
254 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 255 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 256 " ILLEGAL_REQUEST\n");
de103c93 257 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 258 }
259 /*
260 * This is currently the case for target_core_mod passthrough struct se_cmd
261 * ops
262 */
609234e3 263 if (!sess || !sess->se_tpg)
d29a5b6a 264 goto out;
087a03b3
NB		 265 rc = target_check_scsi2_reservation_conflict(cmd);
266 if (rc == 1)
d29a5b6a 267 goto out;
c66ac9db 268
de103c93
CH		 269 if (rc < 0)
270 return TCM_RESERVATION_CONFLICT;
271
609234e3 272 tpg = sess->se_tpg;
c66ac9db
NB		 273 spin_lock(&dev->dev_reservation_lock);
274 if (dev->dev_reserved_node_acl &&
275 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 276 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 277 tpg->se_tpg_tfo->get_fabric_name());
6708bb27 278 pr_err("Original reserver LUN: %u %s\n",
e3d6f909 279 cmd->se_lun->unpacked_lun,
c66ac9db 280 dev->dev_reserved_node_acl->initiatorname);
6708bb27 281 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
e3d6f909 282 " from %s \n", cmd->se_lun->unpacked_lun,
29a05dee 283 cmd->orig_fe_lun,
c66ac9db 284 sess->se_node_acl->initiatorname);
de103c93 285 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 286 goto out_unlock;
c66ac9db
NB		 287 }
288
289 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 290 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 291 if (sess->sess_bin_isid != 0) {
292 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 293 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 294 }
6708bb27 295 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
e3d6f909 296 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
29a05dee 297 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
c66ac9db 298 sess->se_node_acl->initiatorname);
c66ac9db 299
d29a5b6a
CH		 300out_unlock:
301 spin_unlock(&dev->dev_reservation_lock);
302out:
6bb35e00
CH		 303 if (!ret)
304 target_complete_cmd(cmd, GOOD);
d29a5b6a 305 return ret;
c66ac9db
NB		 306}
307
c66ac9db
NB		 308
309/*
310 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
311 *
312 * This function is called by those initiator ports who are *NOT*
313 * the active PR reservation holder when a reservation is present.
314 */
9fcb57f3
CH		 315static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
316 bool isid_mismatch)
c66ac9db 317{
d977f437 318 unsigned char *cdb = cmd->t_task_cdb;
e3d6f909 319 struct se_session *se_sess = cmd->se_sess;
29a05dee 320 struct se_node_acl *nacl = se_sess->se_node_acl;
9fcb57f3 321 int other_cdb = 0;
c66ac9db
NB		 322 int registered_nexus = 0, ret = 1; /* Conflict by default */
323 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
324 int we = 0; /* Write Exclusive */
325 int legacy = 0; /* Act like a legacy device and return
326 * RESERVATION CONFLICT on some CDBs */
c66ac9db 327
9fcb57f3
CH		 328 if (isid_mismatch) {
329 registered_nexus = 0;
330 } else {
331 struct se_dev_entry *se_deve;
332
333 rcu_read_lock();
334 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
335 if (se_deve)
336 registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
337 &se_deve->deve_flags);
338 rcu_read_unlock();
339 }
c66ac9db
NB		 340
341 switch (pr_reg_type) {
342 case PR_TYPE_WRITE_EXCLUSIVE:
343 we = 1;
344 case PR_TYPE_EXCLUSIVE_ACCESS:
345 /*
346 * Some commands are only allowed for the persistent reservation
347 * holder.
348 */
c66ac9db
NB		 349 break;
350 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
351 we = 1;
352 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
353 /*
354 * Some commands are only allowed for registered I_T Nexuses.
355 */
356 reg_only = 1;
c66ac9db
NB		 357 break;
358 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
359 we = 1;
360 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
361 /*
362 * Each registered I_T Nexus is a reservation holder.
363 */
364 all_reg = 1;
c66ac9db
NB		 365 break;
366 default:
e3d6f909 367 return -EINVAL;
c66ac9db
NB		 368 }
369 /*
370 * Referenced from spc4r17 table 45 for *NON* PR holder access
371 */
372 switch (cdb[0]) {
373 case SECURITY_PROTOCOL_IN:
374 if (registered_nexus)
375 return 0;
376 ret = (we) ? 0 : 1;
377 break;
378 case MODE_SENSE:
379 case MODE_SENSE_10:
380 case READ_ATTRIBUTE:
381 case READ_BUFFER:
382 case RECEIVE_DIAGNOSTIC:
383 if (legacy) {
384 ret = 1;
385 break;
386 }
387 if (registered_nexus) {
388 ret = 0;
389 break;
390 }
391 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
392 break;
393 case PERSISTENT_RESERVE_OUT:
394 /*
395 * This follows PERSISTENT_RESERVE_OUT service actions that
396 * are allowed in the presence of various reservations.
397 * See spc4r17, table 46
398 */
399 switch (cdb[1] & 0x1f) {
400 case PRO_CLEAR:
401 case PRO_PREEMPT:
402 case PRO_PREEMPT_AND_ABORT:
403 ret = (registered_nexus) ? 0 : 1;
404 break;
405 case PRO_REGISTER:
406 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
407 ret = 0;
408 break;
409 case PRO_REGISTER_AND_MOVE:
410 case PRO_RESERVE:
411 ret = 1;
412 break;
413 case PRO_RELEASE:
414 ret = (registered_nexus) ? 0 : 1;
415 break;
416 default:
6708bb27 417 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 418 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 419 return -EINVAL;
c66ac9db
NB		 420 }
421 break;
422 case RELEASE:
423 case RELEASE_10:
eacac00c 424 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 425 ret = 0;
426 break;
427 case RESERVE:
428 case RESERVE_10:
eacac00c 429 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 430 ret = 0;
431 break;
432 case TEST_UNIT_READY:
433 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
434 break;
435 case MAINTENANCE_IN:
436 switch (cdb[1] & 0x1f) {
437 case MI_MANAGEMENT_PROTOCOL_IN:
438 if (registered_nexus) {
439 ret = 0;
440 break;
441 }
442 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
443 break;
444 case MI_REPORT_SUPPORTED_OPERATION_CODES:
445 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
446 if (legacy) {
447 ret = 1;
448 break;
449 }
450 if (registered_nexus) {
451 ret = 0;
452 break;
453 }
454 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
455 break;
456 case MI_REPORT_ALIASES:
457 case MI_REPORT_IDENTIFYING_INFORMATION:
458 case MI_REPORT_PRIORITY:
459 case MI_REPORT_TARGET_PGS:
460 case MI_REPORT_TIMESTAMP:
461 ret = 0; /* Allowed */
462 break;
463 default:
6708bb27 464 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 465 (cdb[1] & 0x1f));
e3d6f909 466 return -EINVAL;
c66ac9db
NB		 467 }
468 break;
469 case ACCESS_CONTROL_IN:
470 case ACCESS_CONTROL_OUT:
471 case INQUIRY:
472 case LOG_SENSE:
85686f69 473 case SERVICE_ACTION_IN_12:
c66ac9db
NB		 474 case REPORT_LUNS:
475 case REQUEST_SENSE:
6816966a 476 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 477 ret = 0; /*/ Allowed CDBs */
478 break;
479 default:
480 other_cdb = 1;
481 break;
482 }
483 /*
25985edc 484 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 485 * statement.
486 */
6708bb27 487 if (!ret && !other_cdb) {
125d0119 488 pr_debug("Allowing explicit CDB: 0x%02x for %s"
c66ac9db
NB		 489 " reservation holder\n", cdb[0],
490 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 491
c66ac9db
NB		 492 return ret;
493 }
494 /*
495 * Check if write exclusive initiator ports *NOT* holding the
496 * WRITE_EXCLUSIVE_* reservation.
497 */
ee1b1b9c 498 if (we && !registered_nexus) {
c66ac9db
NB		 499 if (cmd->data_direction == DMA_TO_DEVICE) {
500 /*
501 * Conflict for write exclusive
502 */
6708bb27 503 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 504 " %s CDB: 0x%02x to %s reservation\n",
505 transport_dump_cmd_direction(cmd),
506 se_sess->se_node_acl->initiatorname, cdb[0],
507 core_scsi3_pr_dump_type(pr_reg_type));
508 return 1;
509 } else {
510 /*
511 * Allow non WRITE CDBs for all Write Exclusive
512 * PR TYPEs to pass for registered and
513 * non-registered_nexuxes NOT holding the reservation.
514 *
515 * We only make noise for the unregisterd nexuses,
516 * as we expect registered non-reservation holding
517 * nexuses to issue CDBs.
518 */
8b1e1244 519
6708bb27 520 if (!registered_nexus) {
125d0119 521 pr_debug("Allowing implicit CDB: 0x%02x"
c66ac9db
NB		 522 " for %s reservation on unregistered"
523 " nexus\n", cdb[0],
524 core_scsi3_pr_dump_type(pr_reg_type));
525 }
8b1e1244 526
c66ac9db
NB		 527 return 0;
528 }
529 } else if ((reg_only) || (all_reg)) {
530 if (registered_nexus) {
531 /*
532 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
533 * allow commands from registered nexuses.
534 */
8b1e1244 535
125d0119 536 pr_debug("Allowing implicit CDB: 0x%02x for %s"
c66ac9db
NB		 537 " reservation\n", cdb[0],
538 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 539
c66ac9db
NB		 540 return 0;
541 }
1ecc7586
LD		 542 } else if (we && registered_nexus) {
543 /*
544 * Reads are allowed for Write Exclusive locks
545 * from all registrants.
546 */
547 if (cmd->data_direction == DMA_FROM_DEVICE) {
548 pr_debug("Allowing READ CDB: 0x%02x for %s"
549 " reservation\n", cdb[0],
550 core_scsi3_pr_dump_type(pr_reg_type));
551
552 return 0;
553 }
c66ac9db 554 }
6708bb27 555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 556 " for %s reservation\n", transport_dump_cmd_direction(cmd),
557 (registered_nexus) ? "" : "un",
558 se_sess->se_node_acl->initiatorname, cdb[0],
559 core_scsi3_pr_dump_type(pr_reg_type));
560
561 return 1; /* Conflict by default */
562}
563
de103c93
CH		 564static sense_reason_t
565target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 566{
567 struct se_device *dev = cmd->se_dev;
568 struct se_session *sess = cmd->se_sess;
569 u32 pr_reg_type;
9fcb57f3 570 bool isid_mismatch = false;
d977f437
CH		 571
572 if (!dev->dev_pr_res_holder)
573 return 0;
574
575 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
576 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
577 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
578 goto check_nonholder;
579
580 if (dev->dev_pr_res_holder->isid_present_at_reg) {
581 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
582 sess->sess_bin_isid) {
9fcb57f3 583 isid_mismatch = true;
d977f437
CH		 584 goto check_nonholder;
585 }
586 }
587
588 return 0;
589
590check_nonholder:
9fcb57f3 591 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
de103c93 592 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 593 return 0;
594}
595
c66ac9db
NB		 596static u32 core_scsi3_pr_generation(struct se_device *dev)
597{
c66ac9db 598 u32 prg;
0fd97ccf 599
c66ac9db
NB		 600 /*
601 * PRGeneration field shall contain the value of a 32-bit wrapping
602 * counter mainted by the device server.
603 *
604 * Note that this is done regardless of Active Persist across
605 * Target PowerLoss (APTPL)
606 *
607 * See spc4r17 section 6.3.12 READ_KEYS service action
608 */
609 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 610 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 611 spin_unlock(&dev->dev_reservation_lock);
612
613 return prg;
614}
615
c66ac9db
NB		 616static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
617 struct se_device *dev,
618 struct se_node_acl *nacl,
79dc9c9e 619 struct se_lun *lun,
c66ac9db 620 struct se_dev_entry *deve,
79dc9c9e 621 u32 mapped_lun,
c66ac9db
NB		 622 unsigned char *isid,
623 u64 sa_res_key,
624 int all_tg_pt,
625 int aptpl)
626{
c66ac9db
NB		 627 struct t10_pr_registration *pr_reg;
628
629 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 630 if (!pr_reg) {
631 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 632 return NULL;
633 }
634
c66ac9db
NB		 635 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
636 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
637 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
638 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
640 atomic_set(&pr_reg->pr_res_holders, 0);
641 pr_reg->pr_reg_nacl = nacl;
642 pr_reg->pr_reg_deve = deve;
79dc9c9e
NB		 643 pr_reg->pr_res_mapped_lun = mapped_lun;
644 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
adf653f9 645 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
c66ac9db
NB		 646 pr_reg->pr_res_key = sa_res_key;
647 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
648 pr_reg->pr_reg_aptpl = aptpl;
c66ac9db
NB		 649 /*
650 * If an ISID value for this SCSI Initiator Port exists,
651 * save it to the registration now.
652 */
653 if (isid != NULL) {
654 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
655 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
656 pr_reg->isid_present_at_reg = 1;
657 }
658
659 return pr_reg;
660}
661
662static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
663static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
664
665/*
666 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
667 * modes.
668 */
669static struct t10_pr_registration *__core_scsi3_alloc_registration(
670 struct se_device *dev,
671 struct se_node_acl *nacl,
79dc9c9e 672 struct se_lun *lun,
c66ac9db 673 struct se_dev_entry *deve,
79dc9c9e 674 u32 mapped_lun,
c66ac9db
NB		 675 unsigned char *isid,
676 u64 sa_res_key,
677 int all_tg_pt,
678 int aptpl)
679{
680 struct se_dev_entry *deve_tmp;
681 struct se_node_acl *nacl_tmp;
79dc9c9e 682 struct se_lun_acl *lacl_tmp;
adf653f9 683 struct se_lun *lun_tmp, *next, *dest_lun;
9ac8928e 684 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db
NB		 685 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
686 int ret;
687 /*
688 * Create a registration for the I_T Nexus upon which the
689 * PROUT REGISTER was received.
690 */
79dc9c9e
NB		 691 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
692 isid, sa_res_key, all_tg_pt,
693 aptpl);
6708bb27 694 if (!pr_reg)
c66ac9db
NB		 695 return NULL;
696 /*
697 * Return pointer to pr_reg for ALL_TG_PT=0
698 */
6708bb27 699 if (!all_tg_pt)
c66ac9db
NB		 700 return pr_reg;
701 /*
702 * Create list of matching SCSI Initiator Port registrations
703 * for ALL_TG_PT=1
704 */
705 spin_lock(&dev->se_port_lock);
adf653f9 706 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
9e37d042
NB		 707 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
708 continue;
c66ac9db
NB		 709 spin_unlock(&dev->se_port_lock);
710
adf653f9
CH		 711 spin_lock_bh(&lun_tmp->lun_deve_lock);
712 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
c66ac9db
NB		 713 /*
714 * This pointer will be NULL for demo mode MappedLUNs
125d0119 715 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 716 * MappedLUN group for the SCSI Initiator Node ACL.
717 */
6708bb27 718 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 719 continue;
720
79dc9c9e 721 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
adf653f9 722 lockdep_is_held(&lun_tmp->lun_deve_lock));
79dc9c9e 723 nacl_tmp = lacl_tmp->se_lun_nacl;
c66ac9db
NB		 724 /*
725 * Skip the matching struct se_node_acl that is allocated
726 * above..
727 */
728 if (nacl == nacl_tmp)
729 continue;
730 /*
731 * Only perform PR registrations for target ports on
732 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
733 * arrived.
734 */
735 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
736 continue;
737 /*
738 * Look for a matching Initiator Node ACL in ASCII format
739 */
740 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
741 continue;
742
29a05dee 743 kref_get(&deve_tmp->pr_kref);
adf653f9 744 spin_unlock_bh(&lun_tmp->lun_deve_lock);
c66ac9db
NB		 745 /*
746 * Grab a configfs group dependency that is released
747 * for the exception path at label out: below, or upon
748 * completion of adding ALL_TG_PT=1 registrations in
749 * __core_scsi3_add_registration()
750 */
751 ret = core_scsi3_lunacl_depend_item(deve_tmp);
752 if (ret < 0) {
6708bb27 753 pr_err("core_scsi3_lunacl_depend"
c66ac9db 754 "_item() failed\n");
9e37d042 755 percpu_ref_put(&lun_tmp->lun_ref);
29a05dee 756 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
c66ac9db
NB		 757 goto out;
758 }
759 /*
760 * Located a matching SCSI Initiator Port on a different
761 * port, allocate the pr_reg_atp and attach it to the
762 * pr_reg->pr_reg_atp_list that will be processed once
763 * the original *pr_reg is processed in
764 * __core_scsi3_add_registration()
765 */
adf653f9 766 dest_lun = rcu_dereference_check(deve_tmp->se_lun,
79dc9c9e
NB		 767 atomic_read(&deve_tmp->pr_kref.refcount) != 0);
768
c66ac9db 769 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
adf653f9 770 nacl_tmp, dest_lun, deve_tmp,
79dc9c9e 771 deve_tmp->mapped_lun, NULL,
c66ac9db 772 sa_res_key, all_tg_pt, aptpl);
6708bb27 773 if (!pr_reg_atp) {
9e37d042 774 percpu_ref_put(&lun_tmp->lun_ref);
c66ac9db
NB		 775 core_scsi3_lunacl_undepend_item(deve_tmp);
776 goto out;
777 }
778
779 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
780 &pr_reg->pr_reg_atp_list);
adf653f9 781 spin_lock_bh(&lun_tmp->lun_deve_lock);
c66ac9db 782 }
adf653f9 783 spin_unlock_bh(&lun_tmp->lun_deve_lock);
c66ac9db
NB		 784
785 spin_lock(&dev->se_port_lock);
9e37d042 786 percpu_ref_put(&lun_tmp->lun_ref);
c66ac9db
NB		 787 }
788 spin_unlock(&dev->se_port_lock);
789
790 return pr_reg;
791out:
792 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
793 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
794 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
795 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
796 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
797 }
798 kmem_cache_free(t10_pr_reg_cache, pr_reg);
799 return NULL;
800}
801
802int core_scsi3_alloc_aptpl_registration(
e3d6f909 803 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 804 u64 sa_res_key,
805 unsigned char *i_port,
806 unsigned char *isid,
807 u32 mapped_lun,
808 unsigned char *t_port,
809 u16 tpgt,
810 u32 target_lun,
811 int res_holder,
812 int all_tg_pt,
813 u8 type)
814{
815 struct t10_pr_registration *pr_reg;
816
6708bb27
AG		 817 if (!i_port || !t_port || !sa_res_key) {
818 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 819 return -EINVAL;
c66ac9db
NB		 820 }
821
822 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 823 if (!pr_reg) {
824 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 825 return -ENOMEM;
c66ac9db 826 }
c66ac9db
NB		 827
828 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
829 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
830 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
831 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
832 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
833 atomic_set(&pr_reg->pr_res_holders, 0);
834 pr_reg->pr_reg_nacl = NULL;
835 pr_reg->pr_reg_deve = NULL;
836 pr_reg->pr_res_mapped_lun = mapped_lun;
837 pr_reg->pr_aptpl_target_lun = target_lun;
838 pr_reg->pr_res_key = sa_res_key;
839 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
840 pr_reg->pr_reg_aptpl = 1;
c66ac9db
NB		 841 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
842 pr_reg->pr_res_type = type;
843 /*
844 * If an ISID value had been saved in APTPL metadata for this
845 * SCSI Initiator Port, restore it now.
846 */
847 if (isid != NULL) {
848 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
849 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
850 pr_reg->isid_present_at_reg = 1;
851 }
852 /*
853 * Copy the i_port and t_port information from caller.
854 */
855 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
856 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
857 pr_reg->pr_reg_tpgt = tpgt;
858 /*
859 * Set pr_res_holder from caller, the pr_reg who is the reservation
860 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
861 * the Initiator Node LUN ACL from the fabric module is created for
862 * this registration.
863 */
864 pr_reg->pr_res_holder = res_holder;
865
866 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 867 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 868 " metadata\n", (res_holder) ? "+reservation" : "");
869 return 0;
870}
871
872static void core_scsi3_aptpl_reserve(
873 struct se_device *dev,
874 struct se_portal_group *tpg,
875 struct se_node_acl *node_acl,
876 struct t10_pr_registration *pr_reg)
877{
878 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 879
880 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 881 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 882
883 spin_lock(&dev->dev_reservation_lock);
884 dev->dev_pr_res_holder = pr_reg;
885 spin_unlock(&dev->dev_reservation_lock);
886
6708bb27 887 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 888 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 889 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 890 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
891 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 892 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 893 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 894 i_buf);
c66ac9db
NB		 895}
896
897static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 898 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 899
900static int __core_scsi3_check_aptpl_registration(
901 struct se_device *dev,
902 struct se_portal_group *tpg,
903 struct se_lun *lun,
904 u32 target_lun,
905 struct se_node_acl *nacl,
29a05dee 906 u32 mapped_lun)
c66ac9db
NB		 907{
908 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 909 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 910 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
911 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
912 u16 tpgt;
913
914 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
915 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
916 /*
917 * Copy Initiator Port information from struct se_node_acl
918 */
919 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
920 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 921 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
922 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 923 /*
924 * Look for the matching registrations+reservation from those
925 * created from APTPL metadata. Note that multiple registrations
926 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
927 * TransportIDs.
928 */
929 spin_lock(&pr_tmpl->aptpl_reg_lock);
930 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
931 pr_reg_aptpl_list) {
92404e60 932
6708bb27 933 if (!strcmp(pr_reg->pr_iport, i_port) &&
29a05dee 934 (pr_reg->pr_res_mapped_lun == mapped_lun) &&
c66ac9db
NB		 935 !(strcmp(pr_reg->pr_tport, t_port)) &&
936 (pr_reg->pr_reg_tpgt == tpgt) &&
937 (pr_reg->pr_aptpl_target_lun == target_lun)) {
938
939 pr_reg->pr_reg_nacl = nacl;
adf653f9 940 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
c66ac9db
NB		 941
942 list_del(&pr_reg->pr_reg_aptpl_list);
943 spin_unlock(&pr_tmpl->aptpl_reg_lock);
944 /*
945 * At this point all of the pointers in *pr_reg will
946 * be setup, so go ahead and add the registration.
947 */
948
949 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
950 /*
951 * If this registration is the reservation holder,
952 * make that happen now..
953 */
954 if (pr_reg->pr_res_holder)
955 core_scsi3_aptpl_reserve(dev, tpg,
956 nacl, pr_reg);
957 /*
958 * Reenable pr_aptpl_active to accept new metadata
959 * updates once the SCSI device is active again..
960 */
961 spin_lock(&pr_tmpl->aptpl_reg_lock);
962 pr_tmpl->pr_aptpl_active = 1;
963 }
964 }
965 spin_unlock(&pr_tmpl->aptpl_reg_lock);
966
967 return 0;
968}
969
970int core_scsi3_check_aptpl_registration(
971 struct se_device *dev,
972 struct se_portal_group *tpg,
973 struct se_lun *lun,
e2480563
NB		 974 struct se_node_acl *nacl,
975 u32 mapped_lun)
c66ac9db 976{
d977f437 977 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 978 return 0;
979
980 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
29a05dee
NB		 981 lun->unpacked_lun, nacl,
982 mapped_lun);
c66ac9db
NB		 983}
984
985static void __core_scsi3_dump_registration(
9ac8928e 986 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 987 struct se_device *dev,
988 struct se_node_acl *nacl,
989 struct t10_pr_registration *pr_reg,
33ce6a87 990 enum register_type register_type)
c66ac9db
NB		 991{
992 struct se_portal_group *se_tpg = nacl->se_tpg;
993 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 994
995 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 996 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 997
6708bb27 998 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 999 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1000 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 1001 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 1002 i_buf);
6708bb27 1003 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 1004 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1005 tfo->tpg_get_tag(se_tpg));
6708bb27 1006 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1007 " Port(s)\n", tfo->get_fabric_name(),
1008 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1009 dev->transport->name);
6708bb27 1010 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1011 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1012 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1013 pr_reg->pr_reg_aptpl);
1014}
1015
c66ac9db
NB		 1016static void __core_scsi3_add_registration(
1017 struct se_device *dev,
1018 struct se_node_acl *nacl,
1019 struct t10_pr_registration *pr_reg,
33ce6a87 1020 enum register_type register_type,
c66ac9db
NB		 1021 int register_move)
1022{
9ac8928e 1023 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 1024 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1025 struct t10_reservation *pr_tmpl = &dev->t10_pr;
80bfdfa9 1026 struct se_dev_entry *deve;
c66ac9db
NB		 1027
1028 /*
1029 * Increment PRgeneration counter for struct se_device upon a successful
1030 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1031 *
1032 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1033 * action, the struct se_device->dev_reservation_lock will already be held,
1034 * so we do not call core_scsi3_pr_generation() which grabs the lock
1035 * for the REGISTER.
1036 */
1037 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1038 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1039 core_scsi3_pr_generation(dev);
1040
1041 spin_lock(&pr_tmpl->registration_lock);
1042 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
c66ac9db
NB		 1043
1044 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1045 spin_unlock(&pr_tmpl->registration_lock);
80bfdfa9
NB		 1046
1047 rcu_read_lock();
1048 deve = pr_reg->pr_reg_deve;
1049 if (deve)
1050 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1051 rcu_read_unlock();
1052
c66ac9db
NB		 1053 /*
1054 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1055 */
6708bb27 1056 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1057 return;
1058 /*
1059 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1060 * allocated in __core_scsi3_alloc_registration()
1061 */
1062 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1063 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
80bfdfa9
NB		 1064 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1065
c66ac9db
NB		 1066 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1067
1068 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1069
1070 spin_lock(&pr_tmpl->registration_lock);
1071 list_add_tail(&pr_reg_tmp->pr_reg_list,
1072 &pr_tmpl->registration_list);
c66ac9db 1073
80bfdfa9
NB		 1074 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1075 register_type);
c66ac9db 1076 spin_unlock(&pr_tmpl->registration_lock);
80bfdfa9
NB		 1077
1078 rcu_read_lock();
1079 deve = pr_reg_tmp->pr_reg_deve;
1080 if (deve)
1081 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1082 rcu_read_unlock();
1083
c66ac9db
NB		 1084 /*
1085 * Drop configfs group dependency reference from
1086 * __core_scsi3_alloc_registration()
1087 */
1088 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1089 }
1090}
1091
1092static int core_scsi3_alloc_registration(
1093 struct se_device *dev,
1094 struct se_node_acl *nacl,
79dc9c9e 1095 struct se_lun *lun,
c66ac9db 1096 struct se_dev_entry *deve,
79dc9c9e 1097 u32 mapped_lun,
c66ac9db
NB		 1098 unsigned char *isid,
1099 u64 sa_res_key,
1100 int all_tg_pt,
1101 int aptpl,
33ce6a87 1102 enum register_type register_type,
c66ac9db
NB		 1103 int register_move)
1104{
1105 struct t10_pr_registration *pr_reg;
1106
79dc9c9e
NB		 1107 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1108 isid, sa_res_key, all_tg_pt,
1109 aptpl);
6708bb27 1110 if (!pr_reg)
e3d6f909 1111 return -EPERM;
c66ac9db
NB		 1112
1113 __core_scsi3_add_registration(dev, nacl, pr_reg,
1114 register_type, register_move);
1115 return 0;
1116}
1117
1118static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1119 struct se_device *dev,
1120 struct se_node_acl *nacl,
1121 unsigned char *isid)
1122{
0fd97ccf 1123 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1124 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1125 struct se_portal_group *tpg;
1126
1127 spin_lock(&pr_tmpl->registration_lock);
1128 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1129 &pr_tmpl->registration_list, pr_reg_list) {
1130 /*
1131 * First look for a matching struct se_node_acl
1132 */
1133 if (pr_reg->pr_reg_nacl != nacl)
1134 continue;
1135
1136 tpg = pr_reg->pr_reg_nacl->se_tpg;
1137 /*
1138 * If this registration does NOT contain a fabric provided
1139 * ISID, then we have found a match.
1140 */
6708bb27 1141 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1142 /*
1143 * Determine if this SCSI device server requires that
1144 * SCSI Intiatior TransportID w/ ISIDs is enforced
1145 * for fabric modules (iSCSI) requiring them.
1146 */
e3d6f909 1147 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1148 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1149 continue;
1150 }
33940d09 1151 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1152 spin_unlock(&pr_tmpl->registration_lock);
1153 return pr_reg;
1154 }
1155 /*
1156 * If the *pr_reg contains a fabric defined ISID for multi-value
1157 * SCSI Initiator Port TransportIDs, then we expect a valid
1158 * matching ISID to be provided by the local SCSI Initiator Port.
1159 */
6708bb27 1160 if (!isid)
c66ac9db
NB		 1161 continue;
1162 if (strcmp(isid, pr_reg->pr_reg_isid))
1163 continue;
1164
33940d09 1165 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1166 spin_unlock(&pr_tmpl->registration_lock);
1167 return pr_reg;
1168 }
1169 spin_unlock(&pr_tmpl->registration_lock);
1170
1171 return NULL;
1172}
1173
1174static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1175 struct se_device *dev,
1176 struct se_node_acl *nacl,
1177 struct se_session *sess)
1178{
1179 struct se_portal_group *tpg = nacl->se_tpg;
1180 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1181
e3d6f909 1182 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1183 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1184 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1185 PR_REG_ISID_LEN);
1186 isid_ptr = &buf[0];
1187 }
1188
1189 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1190}
1191
1192static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1193{
33940d09 1194 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1195}
1196
125d0119 1197static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1198 struct se_device *dev,
1199 struct t10_pr_registration *pr_reg)
1200{
1201 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1202 struct t10_pr_registration *pr_res_holder;
1203 int ret = 0;
1204
1205 spin_lock(&dev->dev_reservation_lock);
1206 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1207 if (!pr_res_holder) {
c66ac9db
NB		 1208 spin_unlock(&dev->dev_reservation_lock);
1209 return ret;
1210 }
1211 if (pr_res_holder == pr_reg) {
1212 /*
125d0119 1213 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1214 * is being released is holding the reservation.
1215 *
1216 * From spc4r17, section 5.7.11.1:
1217 *
1218 * e) If the I_T nexus is the persistent reservation holder
1219 * and the persistent reservation is not an all registrants
1220 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1221 * service action or REGISTER AND IGNORE EXISTING KEY
1222 * service action with the SERVICE ACTION RESERVATION KEY
1223 * field set to zero (see 5.7.11.3).
1224 */
6c3c9baa 1225 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
c66ac9db
NB		 1226 ret = 1;
1227 /*
1228 * For 'All Registrants' reservation types, all existing
1229 * registrations are still processed as reservation holders
1230 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1231 * reservation holder is implicitly released here.
c66ac9db
NB		 1232 */
1233 } else if (pr_reg->pr_reg_all_tg_pt &&
1234 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1235 pr_reg->pr_reg_nacl->initiatorname)) &&
1236 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1237 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1238 " UNREGISTER while existing reservation with matching"
1239 " key 0x%016Lx is present from another SCSI Initiator"
1240 " Port\n", pr_reg->pr_res_key);
e3d6f909 1241 ret = -EPERM;
c66ac9db
NB		 1242 }
1243 spin_unlock(&dev->dev_reservation_lock);
1244
1245 return ret;
1246}
1247
1248/*
e3d6f909 1249 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1250 */
1251static void __core_scsi3_free_registration(
1252 struct se_device *dev,
1253 struct t10_pr_registration *pr_reg,
1254 struct list_head *preempt_and_abort_list,
1255 int dec_holders)
cb0df4d3
BVA		 1256 __releases(&pr_tmpl->registration_lock)
1257 __acquires(&pr_tmpl->registration_lock)
c66ac9db 1258{
9ac8928e 1259 const struct target_core_fabric_ops *tfo =
c66ac9db 1260 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1261 struct t10_reservation *pr_tmpl = &dev->t10_pr;
80bfdfa9
NB		 1262 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1263 struct se_dev_entry *deve;
c66ac9db 1264 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1265
1266 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1267 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1268
6c3c9baa
NB		 1269 if (!list_empty(&pr_reg->pr_reg_list))
1270 list_del(&pr_reg->pr_reg_list);
c66ac9db
NB		 1271 /*
1272 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1273 * so call core_scsi3_put_pr_reg() to decrement our reference.
1274 */
1275 if (dec_holders)
1276 core_scsi3_put_pr_reg(pr_reg);
80bfdfa9
NB		 1277
1278 spin_unlock(&pr_tmpl->registration_lock);
c66ac9db
NB		 1279 /*
1280 * Wait until all reference from any other I_T nexuses for this
1281 * *pr_reg have been released. Because list_del() is called above,
1282 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1283 * count back to zero, and we release *pr_reg.
1284 */
1285 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
6708bb27 1286 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1287 tfo->get_fabric_name());
1288 cpu_relax();
c66ac9db
NB		 1289 }
1290
80bfdfa9
NB		 1291 rcu_read_lock();
1292 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1293 if (deve)
1294 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1295 rcu_read_unlock();
1296
1297 spin_lock(&pr_tmpl->registration_lock);
6708bb27 1298 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1299 " Node: %s%s\n", tfo->get_fabric_name(),
1300 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1301 i_buf);
6708bb27 1302 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1303 " Port(s)\n", tfo->get_fabric_name(),
1304 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1305 dev->transport->name);
6708bb27 1306 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1307 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1308 pr_reg->pr_res_generation);
1309
6708bb27 1310 if (!preempt_and_abort_list) {
c66ac9db
NB		 1311 pr_reg->pr_reg_deve = NULL;
1312 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1313 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1314 return;
1315 }
1316 /*
1317 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1318 * are released once the ABORT_TASK_SET has completed..
1319 */
1320 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1321}
1322
1323void core_scsi3_free_pr_reg_from_nacl(
1324 struct se_device *dev,
1325 struct se_node_acl *nacl)
1326{
0fd97ccf 1327 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1328 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
6c3c9baa 1329 bool free_reg = false;
c66ac9db
NB		 1330 /*
1331 * If the passed se_node_acl matches the reservation holder,
1332 * release the reservation.
1333 */
1334 spin_lock(&dev->dev_reservation_lock);
1335 pr_res_holder = dev->dev_pr_res_holder;
1336 if ((pr_res_holder != NULL) &&
6c3c9baa
NB		 1337 (pr_res_holder->pr_reg_nacl == nacl)) {
1338 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1339 free_reg = true;
1340 }
c66ac9db
NB		 1341 spin_unlock(&dev->dev_reservation_lock);
1342 /*
1343 * Release any registration associated with the struct se_node_acl.
1344 */
1345 spin_lock(&pr_tmpl->registration_lock);
6c3c9baa
NB		 1346 if (pr_res_holder && free_reg)
1347 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1348
c66ac9db
NB		 1349 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1350 &pr_tmpl->registration_list, pr_reg_list) {
1351
1352 if (pr_reg->pr_reg_nacl != nacl)
1353 continue;
1354
1355 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1356 }
1357 spin_unlock(&pr_tmpl->registration_lock);
1358}
1359
1360void core_scsi3_free_all_registrations(
1361 struct se_device *dev)
1362{
0fd97ccf 1363 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1364 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1365
1366 spin_lock(&dev->dev_reservation_lock);
1367 pr_res_holder = dev->dev_pr_res_holder;
1368 if (pr_res_holder != NULL) {
1369 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1370 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 1371 pr_res_holder, 0, 0);
c66ac9db
NB		 1372 }
1373 spin_unlock(&dev->dev_reservation_lock);
1374
1375 spin_lock(&pr_tmpl->registration_lock);
1376 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1377 &pr_tmpl->registration_list, pr_reg_list) {
1378
1379 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1380 }
1381 spin_unlock(&pr_tmpl->registration_lock);
1382
1383 spin_lock(&pr_tmpl->aptpl_reg_lock);
1384 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1385 pr_reg_aptpl_list) {
1386 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1387 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1388 }
1389 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1390}
1391
1392static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1393{
d588cf8f 1394 return target_depend_item(&tpg->tpg_group.cg_item);
c66ac9db
NB		 1395}
1396
1397static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1398{
d588cf8f 1399 target_undepend_item(&tpg->tpg_group.cg_item);
33940d09 1400 atomic_dec_mb(&tpg->tpg_pr_ref_count);
c66ac9db
NB		 1401}
1402
1403static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1404{
c66ac9db
NB		 1405 if (nacl->dynamic_node_acl)
1406 return 0;
d588cf8f 1407 return target_depend_item(&nacl->acl_group.cg_item);
c66ac9db
NB		 1408}
1409
1410static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1411{
d588cf8f
CH		 1412 if (!nacl->dynamic_node_acl)
1413 target_undepend_item(&nacl->acl_group.cg_item);
33940d09 1414 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1415}
1416
1417static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1418{
79dc9c9e 1419 struct se_lun_acl *lun_acl;
c66ac9db
NB		 1420 struct se_node_acl *nacl;
1421 struct se_portal_group *tpg;
1422 /*
1423 * For nacl->dynamic_node_acl=1
1424 */
79dc9c9e
NB		 1425 lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1426 atomic_read(&se_deve->pr_kref.refcount) != 0);
6708bb27 1427 if (!lun_acl)
c66ac9db
NB		 1428 return 0;
1429
1430 nacl = lun_acl->se_lun_nacl;
1431 tpg = nacl->se_tpg;
1432
d588cf8f 1433 return target_depend_item(&lun_acl->se_lun_group.cg_item);
c66ac9db
NB		 1434}
1435
1436static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1437{
29a05dee 1438 struct se_lun_acl *lun_acl;
c66ac9db
NB		 1439 struct se_node_acl *nacl;
1440 struct se_portal_group *tpg;
1441 /*
1442 * For nacl->dynamic_node_acl=1
1443 */
79dc9c9e
NB		 1444 lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1445 atomic_read(&se_deve->pr_kref.refcount) != 0);
6708bb27 1446 if (!lun_acl) {
29a05dee 1447 kref_put(&se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1448 return;
1449 }
1450 nacl = lun_acl->se_lun_nacl;
1451 tpg = nacl->se_tpg;
1452
d588cf8f 1453 target_undepend_item(&lun_acl->se_lun_group.cg_item);
29a05dee 1454 kref_put(&se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1455}
1456
de103c93
CH		 1457static sense_reason_t
1458core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1459 struct se_cmd *cmd,
1460 struct se_portal_group *tpg,
1461 unsigned char *l_isid,
1462 u64 sa_res_key,
1463 int all_tg_pt,
1464 int aptpl)
1465{
5951146d 1466 struct se_device *dev = cmd->se_dev;
c66ac9db 1467 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1468 struct se_session *se_sess = cmd->se_sess;
c66ac9db 1469 struct se_node_acl *dest_node_acl = NULL;
79dc9c9e 1470 struct se_dev_entry *dest_se_deve = NULL;
c66ac9db
NB		 1471 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1472 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1473 LIST_HEAD(tid_dest_list);
c66ac9db 1474 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
2650d71e
CH		 1475 unsigned char *buf, *ptr, proto_ident;
1476 const unsigned char *i_str;
13ba564c 1477 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
de103c93 1478 sense_reason_t ret;
c66ac9db 1479 u32 tpdl, tid_len = 0;
c66ac9db
NB		 1480 u32 dest_rtpi = 0;
1481
c66ac9db
NB		 1482 /*
1483 * Allocate a struct pr_transport_id_holder and setup the
79dc9c9e
NB		 1484 * local_node_acl pointer and add to struct list_head tid_dest_list
1485 * for add registration processing in the loop of tid_dest_list below.
c66ac9db
NB		 1486 */
1487 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1488 if (!tidh_new) {
1489 pr_err("Unable to allocate tidh_new\n");
de103c93 1490 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1491 }
1492 INIT_LIST_HEAD(&tidh_new->dest_list);
1493 tidh_new->dest_tpg = tpg;
1494 tidh_new->dest_node_acl = se_sess->se_node_acl;
c66ac9db 1495
5951146d 1496 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 1497 se_sess->se_node_acl, cmd->se_lun,
1498 NULL, cmd->orig_fe_lun, l_isid,
c66ac9db 1499 sa_res_key, all_tg_pt, aptpl);
6708bb27 1500 if (!local_pr_reg) {
c66ac9db 1501 kfree(tidh_new);
de103c93 1502 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1503 }
1504 tidh_new->dest_pr_reg = local_pr_reg;
1505 /*
1506 * The local I_T nexus does not hold any configfs dependances,
79dc9c9e 1507 * so we set tidh_new->dest_se_deve to NULL to prevent the
c66ac9db
NB		 1508 * configfs_undepend_item() calls in the tid_dest_list loops below.
1509 */
79dc9c9e 1510 tidh_new->dest_se_deve = NULL;
c66ac9db 1511 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1512
0d7f1299
PB		 1513 if (cmd->data_length < 28) {
1514 pr_warn("SPC-PR: Received PR OUT parameter list"
1515 " length too small: %u\n", cmd->data_length);
de103c93 1516 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1517 goto out;
1518 }
1519
4949314c 1520 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1521 if (!buf) {
1522 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1523 goto out;
1524 }
1525
c66ac9db
NB		 1526 /*
1527 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1528 * first extract TransportID Parameter Data Length, and make sure
1529 * the value matches up to the SCSI expected data transfer length.
1530 */
1531 tpdl = (buf[24] & 0xff) << 24;
1532 tpdl |= (buf[25] & 0xff) << 16;
1533 tpdl |= (buf[26] & 0xff) << 8;
1534 tpdl |= buf[27] & 0xff;
1535
1536 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1537 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1538 " does not equal CDB data_length: %u\n", tpdl,
1539 cmd->data_length);
de103c93
CH		 1540 ret = TCM_INVALID_PARAMETER_LIST;
1541 goto out_unmap;
c66ac9db
NB		 1542 }
1543 /*
1544 * Start processing the received transport IDs using the
1545 * receiving I_T Nexus portal's fabric dependent methods to
1546 * obtain the SCSI Initiator Port/Device Identifiers.
1547 */
1548 ptr = &buf[28];
1549
1550 while (tpdl > 0) {
adf653f9 1551 struct se_lun *dest_lun, *tmp_lun;
79dc9c9e 1552
c66ac9db
NB		 1553 proto_ident = (ptr[0] & 0x0f);
1554 dest_tpg = NULL;
1555
1556 spin_lock(&dev->se_port_lock);
adf653f9
CH		 1557 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1558 tmp_tpg = tmp_lun->lun_tpg;
2650d71e 1559
c66ac9db
NB		 1560 /*
1561 * Look for the matching proto_ident provided by
1562 * the received TransportID
1563 */
2aeeafae 1564 if (tmp_tpg->proto_id != proto_ident)
c66ac9db 1565 continue;
adf653f9 1566 dest_rtpi = tmp_lun->lun_rtpi;
c66ac9db 1567
2650d71e
CH		 1568 i_str = target_parse_pr_out_transport_id(tmp_tpg,
1569 (const char *)ptr, &tid_len, &iport_ptr);
6708bb27 1570 if (!i_str)
c66ac9db
NB		 1571 continue;
1572
33940d09 1573 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
c66ac9db
NB		 1574 spin_unlock(&dev->se_port_lock);
1575
de103c93 1576 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1577 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db 1578 " for tmp_tpg\n");
33940d09 1579 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
de103c93
CH		 1580 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1581 goto out_unmap;
c66ac9db
NB		 1582 }
1583 /*
35d1efe8 1584 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1585 * from the decoded fabric module specific TransportID
1586 * at *i_str.
1587 */
403edd78 1588 mutex_lock(&tmp_tpg->acl_node_mutex);
c66ac9db
NB		 1589 dest_node_acl = __core_tpg_get_initiator_node_acl(
1590 tmp_tpg, i_str);
33940d09
JE		 1591 if (dest_node_acl)
1592 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
403edd78 1593 mutex_unlock(&tmp_tpg->acl_node_mutex);
c66ac9db 1594
6708bb27 1595 if (!dest_node_acl) {
c66ac9db
NB		 1596 core_scsi3_tpg_undepend_item(tmp_tpg);
1597 spin_lock(&dev->se_port_lock);
1598 continue;
1599 }
1600
de103c93 1601 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1602 pr_err("configfs_depend_item() failed"
c66ac9db 1603 " for dest_node_acl->acl_group\n");
33940d09 1604 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 1605 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1606 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1607 goto out_unmap;
c66ac9db
NB		 1608 }
1609
1610 dest_tpg = tmp_tpg;
6708bb27 1611 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1612 " %s Port RTPI: %hu\n",
e3d6f909 1613 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1614 dest_node_acl->initiatorname, dest_rtpi);
1615
1616 spin_lock(&dev->se_port_lock);
1617 break;
1618 }
1619 spin_unlock(&dev->se_port_lock);
1620
6708bb27
AG		 1621 if (!dest_tpg) {
1622 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1623 " dest_tpg\n");
de103c93
CH		 1624 ret = TCM_INVALID_PARAMETER_LIST;
1625 goto out_unmap;
c66ac9db 1626 }
8b1e1244 1627
6708bb27 1628 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1629 " tid_len: %d for %s + %s\n",
e3d6f909 1630 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1631 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1632
c66ac9db 1633 if (tid_len > tpdl) {
6708bb27 1634 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1635 " %u for Transport ID: %s\n", tid_len, ptr);
1636 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1637 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1638 ret = TCM_INVALID_PARAMETER_LIST;
1639 goto out_unmap;
c66ac9db
NB		 1640 }
1641 /*
1642 * Locate the desintation struct se_dev_entry pointer for matching
1643 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1644 * Target Port.
1645 */
1646 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1647 dest_rtpi);
6708bb27
AG		 1648 if (!dest_se_deve) {
1649 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1650 " from destination RTPI: %hu\n",
e3d6f909 1651 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1652 dest_rtpi);
1653
1654 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1655 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1656 ret = TCM_INVALID_PARAMETER_LIST;
1657 goto out_unmap;
c66ac9db
NB		 1658 }
1659
de103c93 1660 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1661 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db 1662 " failed\n");
29a05dee 1663 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1664 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1665 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1666 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1667 goto out_unmap;
c66ac9db 1668 }
8b1e1244 1669
6708bb27 1670 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1671 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1672 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1673 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1674
c66ac9db
NB		 1675 /*
1676 * Skip any TransportIDs that already have a registration for
1677 * this target port.
1678 */
1679 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1680 iport_ptr);
1681 if (pr_reg_e) {
1682 core_scsi3_put_pr_reg(pr_reg_e);
1683 core_scsi3_lunacl_undepend_item(dest_se_deve);
1684 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1685 core_scsi3_tpg_undepend_item(dest_tpg);
1686 ptr += tid_len;
1687 tpdl -= tid_len;
1688 tid_len = 0;
1689 continue;
1690 }
1691 /*
1692 * Allocate a struct pr_transport_id_holder and setup
1693 * the dest_node_acl and dest_se_deve pointers for the
1694 * loop below.
1695 */
1696 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1697 GFP_KERNEL);
6708bb27
AG		 1698 if (!tidh_new) {
1699 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1700 core_scsi3_lunacl_undepend_item(dest_se_deve);
1701 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1702 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1703 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1704 goto out_unmap;
c66ac9db
NB		 1705 }
1706 INIT_LIST_HEAD(&tidh_new->dest_list);
1707 tidh_new->dest_tpg = dest_tpg;
1708 tidh_new->dest_node_acl = dest_node_acl;
1709 tidh_new->dest_se_deve = dest_se_deve;
1710
1711 /*
1712 * Allocate, but do NOT add the registration for the
1713 * TransportID referenced SCSI Initiator port. This
1714 * done because of the following from spc4r17 in section
1715 * 6.14.3 wrt SPEC_I_PT:
1716 *
1717 * "If a registration fails for any initiator port (e.g., if th
1718 * logical unit does not have enough resources available to
1719 * hold the registration information), no registrations shall be
1720 * made, and the command shall be terminated with
1721 * CHECK CONDITION status."
1722 *
1723 * That means we call __core_scsi3_alloc_registration() here,
1724 * and then call __core_scsi3_add_registration() in the
1725 * 2nd loop which will never fail.
1726 */
79dc9c9e
NB		 1727 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1728 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
1729
5951146d 1730 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 1731 dest_node_acl, dest_lun, dest_se_deve,
1732 dest_se_deve->mapped_lun, iport_ptr,
1733 sa_res_key, all_tg_pt, aptpl);
6708bb27 1734 if (!dest_pr_reg) {
c66ac9db
NB		 1735 core_scsi3_lunacl_undepend_item(dest_se_deve);
1736 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1737 core_scsi3_tpg_undepend_item(dest_tpg);
1738 kfree(tidh_new);
de103c93
CH		 1739 ret = TCM_INVALID_PARAMETER_LIST;
1740 goto out_unmap;
c66ac9db
NB		 1741 }
1742 tidh_new->dest_pr_reg = dest_pr_reg;
1743 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1744
1745 ptr += tid_len;
1746 tpdl -= tid_len;
1747 tid_len = 0;
1748
1749 }
05d1c7c0 1750
4949314c 1751 transport_kunmap_data_sg(cmd);
05d1c7c0 1752
c66ac9db
NB		 1753 /*
1754 * Go ahead and create a registrations from tid_dest_list for the
1755 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1756 * and dest_se_deve.
1757 *
1758 * The SA Reservation Key from the PROUT is set for the
1759 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1760 * means that the TransportID Initiator port will be
1761 * registered on all of the target ports in the SCSI target device
1762 * ALL_TG_PT=0 means the registration will only be for the
1763 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1764 * was received.
1765 */
1766 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1767 dest_tpg = tidh->dest_tpg;
1768 dest_node_acl = tidh->dest_node_acl;
1769 dest_se_deve = tidh->dest_se_deve;
1770 dest_pr_reg = tidh->dest_pr_reg;
c66ac9db
NB		 1771
1772 list_del(&tidh->dest_list);
1773 kfree(tidh);
1774
1775 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1776 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1777
5951146d 1778 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1779 dest_pr_reg, 0, 0);
1780
6708bb27 1781 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1782 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1783 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
79dc9c9e
NB		 1784 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1785 dest_se_deve->mapped_lun : 0);
c66ac9db 1786
79dc9c9e 1787 if (!dest_se_deve)
c66ac9db
NB		 1788 continue;
1789
1790 core_scsi3_lunacl_undepend_item(dest_se_deve);
1791 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1792 core_scsi3_tpg_undepend_item(dest_tpg);
1793 }
1794
1795 return 0;
de103c93 1796out_unmap:
4949314c 1797 transport_kunmap_data_sg(cmd);
de103c93 1798out:
c66ac9db
NB		 1799 /*
1800 * For the failure case, release everything from tid_dest_list
1801 * including *dest_pr_reg and the configfs dependances..
1802 */
1803 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1804 dest_tpg = tidh->dest_tpg;
1805 dest_node_acl = tidh->dest_node_acl;
1806 dest_se_deve = tidh->dest_se_deve;
1807 dest_pr_reg = tidh->dest_pr_reg;
c66ac9db
NB		 1808
1809 list_del(&tidh->dest_list);
1810 kfree(tidh);
1811 /*
1812 * Release any extra ALL_TG_PT=1 registrations for
1813 * the SPEC_I_PT=1 case.
1814 */
1815 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1816 &dest_pr_reg->pr_reg_atp_list,
1817 pr_reg_atp_mem_list) {
1818 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1819 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1820 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1821 }
1822
c66ac9db
NB		 1823 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1824
79dc9c9e 1825 if (!dest_se_deve)
c66ac9db
NB		 1826 continue;
1827
1828 core_scsi3_lunacl_undepend_item(dest_se_deve);
1829 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1830 core_scsi3_tpg_undepend_item(dest_tpg);
1831 }
1832 return ret;
1833}
1834
3c8a6228 1835static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1836 struct se_device *dev,
1837 unsigned char *buf,
0607decd 1838 u32 pr_aptpl_buf_len)
c66ac9db 1839{
c66ac9db 1840 struct se_portal_group *tpg;
c66ac9db
NB		 1841 struct t10_pr_registration *pr_reg;
1842 unsigned char tmp[512], isid_buf[32];
1843 ssize_t len = 0;
1844 int reg_count = 0;
3c8a6228 1845 int ret = 0;
c66ac9db 1846
3c8a6228
AG		 1847 spin_lock(&dev->dev_reservation_lock);
1848 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1849 /*
1850 * Walk the registration list..
1851 */
0fd97ccf 1852 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1853 pr_reg_list) {
1854
1855 tmp[0] = '\0';
1856 isid_buf[0] = '\0';
1857 tpg = pr_reg->pr_reg_nacl->se_tpg;
c66ac9db
NB		 1858 /*
1859 * Write out any ISID value to APTPL metadata that was included
1860 * in the original registration.
1861 */
1862 if (pr_reg->isid_present_at_reg)
1863 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1864 pr_reg->pr_reg_isid);
1865 /*
1866 * Include special metadata if the pr_reg matches the
1867 * reservation holder.
1868 */
1869 if (dev->dev_pr_res_holder == pr_reg) {
1870 snprintf(tmp, 512, "PR_REG_START: %d"
1871 "\ninitiator_fabric=%s\n"
1872 "initiator_node=%s\n%s"
1873 "sa_res_key=%llu\n"
1874 "res_holder=1\nres_type=%02x\n"
1875 "res_scope=%02x\nres_all_tg_pt=%d\n"
1876 "mapped_lun=%u\n", reg_count,
e3d6f909 1877 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1878 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1879 pr_reg->pr_res_key, pr_reg->pr_res_type,
1880 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1881 pr_reg->pr_res_mapped_lun);
1882 } else {
1883 snprintf(tmp, 512, "PR_REG_START: %d\n"
1884 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1885 "sa_res_key=%llu\nres_holder=0\n"
1886 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1887 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1888 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1889 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1890 pr_reg->pr_res_mapped_lun);
1891 }
1892
60d645a4 1893 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1894 pr_err("Unable to update renaming APTPL metadata,"
1895 " reallocating larger buffer\n");
3c8a6228
AG		 1896 ret = -EMSGSIZE;
1897 goto out;
c66ac9db
NB		 1898 }
1899 len += sprintf(buf+len, "%s", tmp);
1900
1901 /*
1902 * Include information about the associated SCSI target port.
1903 */
1904 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1905 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1906 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1907 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1908 tpg->se_tpg_tfo->tpg_get_tag(tpg),
79dc9c9e
NB		 1909 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1910 reg_count);
c66ac9db 1911
60d645a4 1912 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1913 pr_err("Unable to update renaming APTPL metadata,"
1914 " reallocating larger buffer\n");
3c8a6228
AG		 1915 ret = -EMSGSIZE;
1916 goto out;
c66ac9db
NB		 1917 }
1918 len += sprintf(buf+len, "%s", tmp);
1919 reg_count++;
1920 }
c66ac9db 1921
6708bb27 1922 if (!reg_count)
c66ac9db
NB		 1923 len += sprintf(buf+len, "No Registrations or Reservations");
1924
3c8a6228
AG		 1925out:
1926 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1927 spin_unlock(&dev->dev_reservation_lock);
1928
1929 return ret;
1930}
1931
c66ac9db
NB		 1932static int __core_scsi3_write_aptpl_to_file(
1933 struct se_device *dev,
4dee96fb 1934 unsigned char *buf)
c66ac9db 1935{
0fd97ccf 1936 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1937 struct file *file;
c66ac9db
NB		 1938 int flags = O_RDWR | O_CREAT | O_TRUNC;
1939 char path[512];
4dee96fb 1940 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1941 int ret;
1942
c66ac9db
NB		 1943 memset(path, 0, 512);
1944
60d645a4 1945 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1946 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1947 " into path buffer\n");
e3d6f909 1948 return -EMSGSIZE;
c66ac9db
NB		 1949 }
1950
1951 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1952 file = filp_open(path, flags, 0600);
0e9b10a9 1953 if (IS_ERR(file)) {
6708bb27 1954 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1955 " failed\n", path);
0e9b10a9 1956 return PTR_ERR(file);
c66ac9db
NB		 1957 }
1958
4dee96fb 1959 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1960
0e9b10a9 1961 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1962
0e9b10a9 1963 if (ret < 0)
6708bb27 1964 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1965 fput(file);
c66ac9db 1966
f730f915 1967 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 1968}
1969
459f213b
AG		 1970/*
1971 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1972 * write out the updated metadata to struct file for this SCSI device.
1973 */
8a391857 1974static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 1975{
8a391857 1976 unsigned char *buf;
f161d4b4 1977 int rc, len = PR_APTPL_BUF_LEN;
de103c93 1978
459f213b
AG		 1979 if (!aptpl) {
1980 char *null_buf = "No Registrations or Reservations\n";
1981
8a391857 1982 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 1983 dev->t10_pr.pr_aptpl_active = 0;
1984 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 1985
8a391857
NB		 1986 if (rc)
1987 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 1988
8a391857
NB		 1989 return 0;
1990 }
f161d4b4
NB		 1991retry:
1992 buf = vzalloc(len);
8a391857
NB		 1993 if (!buf)
1994 return TCM_OUT_OF_RESOURCES;
1995
f161d4b4 1996 rc = core_scsi3_update_aptpl_buf(dev, buf, len);
8a391857 1997 if (rc < 0) {
f161d4b4
NB		 1998 vfree(buf);
1999 len *= 2;
2000 goto retry;
c66ac9db
NB		 2001 }
2002
8a391857
NB		 2003 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2004 if (rc != 0) {
2005 pr_err("SPC-3 PR: Could not update APTPL\n");
f161d4b4 2006 vfree(buf);
8a391857
NB		 2007 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2008 }
2009 dev->t10_pr.pr_aptpl_active = 1;
f161d4b4 2010 vfree(buf);
8a391857
NB		 2011 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2012 return 0;
c66ac9db
NB		 2013}
2014
de103c93
CH		 2015static sense_reason_t
2016core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 2017 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 2018{
e3d6f909 2019 struct se_session *se_sess = cmd->se_sess;
5951146d 2020 struct se_device *dev = cmd->se_dev;
e3d6f909 2021 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2022 struct se_portal_group *se_tpg;
bc118fe4 2023 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2024 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2025 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2026 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2027 int pr_holder = 0, type;
c66ac9db 2028
6708bb27
AG		 2029 if (!se_sess || !se_lun) {
2030 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2031 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2032 }
2033 se_tpg = se_sess->se_tpg;
29a05dee 2034
e3d6f909 2035 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2036 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2037 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2038 PR_REG_ISID_LEN);
2039 isid_ptr = &isid_buf[0];
2040 }
2041 /*
2042 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2043 */
bc118fe4
AG		 2044 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2045 if (!pr_reg) {
c66ac9db 2046 if (res_key) {
6708bb27 2047 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2048 " for SA REGISTER, returning CONFLICT\n");
de103c93 2049 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2050 }
2051 /*
2052 * Do nothing but return GOOD status.
2053 */
79dc9c9e 2054 if (!sa_res_key)
03e98c9e 2055 return 0;
79dc9c9e 2056
6708bb27 2057 if (!spec_i_pt) {
c66ac9db
NB		 2058 /*
2059 * Perform the Service Action REGISTER on the Initiator
2060 * Port Endpoint that the PRO was received from on the
2061 * Logical Unit of the SCSI device server.
2062 */
de103c93 2063 if (core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 2064 se_sess->se_node_acl, cmd->se_lun,
2065 NULL, cmd->orig_fe_lun, isid_ptr,
c66ac9db 2066 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2067 register_type, 0)) {
6708bb27 2068 pr_err("Unable to allocate"
c66ac9db 2069 " struct t10_pr_registration\n");
de103c93 2070 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2071 }
2072 } else {
2073 /*
2074 * Register both the Initiator port that received
2075 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2076 * TransportID from Parameter list and loop through
2077 * fabric dependent parameter list while calling
2078 * logic from of core_scsi3_alloc_registration() for
2079 * each TransportID provided SCSI Initiator Port/Device
2080 */
79dc9c9e 2081 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
c66ac9db 2082 isid_ptr, sa_res_key, all_tg_pt, aptpl);
79dc9c9e 2083 if (ret != 0)
c66ac9db
NB		 2084 return ret;
2085 }
459f213b 2086 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2087 }
2088
bc118fe4
AG		 2089 /* ok, existing registration */
2090
2091 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2092 pr_err("SPC-3 PR REGISTER: Received"
2093 " res_key: 0x%016Lx does not match"
2094 " existing SA REGISTER res_key:"
2095 " 0x%016Lx\n", res_key,
2096 pr_reg->pr_res_key);
2097 ret = TCM_RESERVATION_CONFLICT;
2098 goto out;
de103c93
CH		 2099 }
2100
2101 if (spec_i_pt) {
1f070cc2
AG		 2102 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2103 " set on a registered nexus\n");
de103c93 2104 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2105 goto out;
de103c93
CH		 2106 }
2107
2108 /*
2109 * An existing ALL_TG_PT=1 registration being released
2110 * must also set ALL_TG_PT=1 in the incoming PROUT.
2111 */
1f070cc2
AG		 2112 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2113 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2114 " registration exists, but ALL_TG_PT=1 bit not"
2115 " present in received PROUT\n");
2116 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2117 goto out;
de103c93
CH		 2118 }
2119
de103c93 2120 /*
51d9c41d 2121 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2122 */
51d9c41d
AG		 2123 if (sa_res_key) {
2124 /*
2125 * Increment PRgeneration counter for struct se_device"
2126 * upon a successful REGISTER, see spc4r17 section 6.3.2
2127 * READ_KEYS service action.
2128 */
2129 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2130 pr_reg->pr_res_key = sa_res_key;
2131 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2132 " Key for %s to: 0x%016Lx PRgeneration:"
2133 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2134 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2135 pr_reg->pr_reg_nacl->initiatorname,
2136 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2137
2138 } else {
2139 /*
2140 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2141 */
6c3c9baa
NB		 2142 type = pr_reg->pr_res_type;
2143 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2144 pr_reg);
de103c93 2145 if (pr_holder < 0) {
de103c93 2146 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2147 goto out;
c66ac9db 2148 }
de103c93
CH		 2149
2150 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2151 /*
de103c93
CH		 2152 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2153 * and matching pr_res_key.
c66ac9db 2154 */
de103c93
CH		 2155 if (pr_reg->pr_reg_all_tg_pt) {
2156 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2157 &pr_tmpl->registration_list,
2158 pr_reg_list) {
2159
2160 if (!pr_reg_p->pr_reg_all_tg_pt)
2161 continue;
2162 if (pr_reg_p->pr_res_key != res_key)
2163 continue;
2164 if (pr_reg == pr_reg_p)
2165 continue;
2166 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2167 pr_reg_p->pr_reg_nacl->initiatorname))
2168 continue;
2169
2170 __core_scsi3_free_registration(dev,
2171 pr_reg_p, NULL, 0);
c66ac9db
NB		 2172 }
2173 }
de103c93 2174
c66ac9db 2175 /*
de103c93 2176 * Release the calling I_T Nexus registration now..
c66ac9db 2177 */
de103c93 2178 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2179 pr_reg = NULL;
c66ac9db 2180
de103c93
CH		 2181 /*
2182 * From spc4r17, section 5.7.11.3 Unregistering
2183 *
2184 * If the persistent reservation is a registrants only
2185 * type, the device server shall establish a unit
2186 * attention condition for the initiator port associated
2187 * with every registered I_T nexus except for the I_T
2188 * nexus on which the PERSISTENT RESERVE OUT command was
2189 * received, with the additional sense code set to
2190 * RESERVATIONS RELEASED.
2191 */
2192 if (pr_holder &&
fc09149d
NB		 2193 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2194 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2195 list_for_each_entry(pr_reg_p,
2196 &pr_tmpl->registration_list,
2197 pr_reg_list) {
2198
2199 core_scsi3_ua_allocate(
2200 pr_reg_p->pr_reg_nacl,
2201 pr_reg_p->pr_res_mapped_lun,
2202 0x2A,
2203 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2204 }
de103c93 2205 }
c66ac9db 2206
51d9c41d 2207 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2208 }
c66ac9db 2209
459f213b 2210 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2211
bc118fe4 2212out:
fc09149d
NB		 2213 if (pr_reg)
2214 core_scsi3_put_pr_reg(pr_reg);
de103c93 2215 return ret;
c66ac9db
NB		 2216}
2217
2218unsigned char *core_scsi3_pr_dump_type(int type)
2219{
2220 switch (type) {
2221 case PR_TYPE_WRITE_EXCLUSIVE:
2222 return "Write Exclusive Access";
2223 case PR_TYPE_EXCLUSIVE_ACCESS:
2224 return "Exclusive Access";
2225 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2226 return "Write Exclusive Access, Registrants Only";
2227 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2228 return "Exclusive Access, Registrants Only";
2229 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2230 return "Write Exclusive Access, All Registrants";
2231 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2232 return "Exclusive Access, All Registrants";
2233 default:
2234 break;
2235 }
2236
2237 return "Unknown SPC-3 PR Type";
2238}
2239
de103c93
CH		 2240static sense_reason_t
2241core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2242{
de103c93 2243 struct se_device *dev = cmd->se_dev;
e3d6f909 2244 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2245 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2246 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2247 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2248 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2249 sense_reason_t ret;
c66ac9db
NB		 2250
2251 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2252
6708bb27
AG		 2253 if (!se_sess || !se_lun) {
2254 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2255 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2256 }
c66ac9db
NB		 2257 /*
2258 * Locate the existing *pr_reg via struct se_node_acl pointers
2259 */
5951146d 2260 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2261 se_sess);
6708bb27
AG		 2262 if (!pr_reg) {
2263 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2264 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2265 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2266 }
2267 /*
2268 * From spc4r17 Section 5.7.9: Reserving:
2269 *
2270 * An application client creates a persistent reservation by issuing
2271 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2272 * a registered I_T nexus with the following parameters:
2273 * a) RESERVATION KEY set to the value of the reservation key that is
2274 * registered with the logical unit for the I_T nexus; and
2275 */
2276 if (res_key != pr_reg->pr_res_key) {
6708bb27 2277 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2278 " does not match existing SA REGISTER res_key:"
2279 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2280 ret = TCM_RESERVATION_CONFLICT;
2281 goto out_put_pr_reg;
c66ac9db
NB		 2282 }
2283 /*
2284 * From spc4r17 Section 5.7.9: Reserving:
2285 *
2286 * From above:
2287 * b) TYPE field and SCOPE field set to the persistent reservation
2288 * being created.
2289 *
2290 * Only one persistent reservation is allowed at a time per logical unit
2291 * and that persistent reservation has a scope of LU_SCOPE.
2292 */
2293 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2294 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2295 ret = TCM_INVALID_PARAMETER_LIST;
2296 goto out_put_pr_reg;
c66ac9db
NB		 2297 }
2298 /*
2299 * See if we have an existing PR reservation holder pointer at
2300 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2301 * *pr_res_holder.
2302 */
2303 spin_lock(&dev->dev_reservation_lock);
2304 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2305 if (pr_res_holder) {
c66ac9db
NB		 2306 /*
2307 * From spc4r17 Section 5.7.9: Reserving:
2308 *
2309 * If the device server receives a PERSISTENT RESERVE OUT
2310 * command from an I_T nexus other than a persistent reservation
2311 * holder (see 5.7.10) that attempts to create a persistent
2312 * reservation when a persistent reservation already exists for
2313 * the logical unit, then the command shall be completed with
2314 * RESERVATION CONFLICT status.
2315 */
e673dc92 2316 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2317 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2318 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2319 " [%s]: %s while reservation already held by"
2320 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2321 cmd->se_tfo->get_fabric_name(),
c66ac9db 2322 se_sess->se_node_acl->initiatorname,
e3d6f909 2323 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2324 pr_res_holder->pr_reg_nacl->initiatorname);
2325
2326 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2327 ret = TCM_RESERVATION_CONFLICT;
2328 goto out_put_pr_reg;
c66ac9db
NB		 2329 }
2330 /*
2331 * From spc4r17 Section 5.7.9: Reserving:
2332 *
2333 * If a persistent reservation holder attempts to modify the
2334 * type or scope of an existing persistent reservation, the
2335 * command shall be completed with RESERVATION CONFLICT status.
2336 */
2337 if ((pr_res_holder->pr_res_type != type) ||
2338 (pr_res_holder->pr_res_scope != scope)) {
2339 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2340 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2341 " [%s]: %s trying to change TYPE and/or SCOPE,"
2342 " while reservation already held by [%s]: %s,"
2343 " returning RESERVATION_CONFLICT\n",
e3d6f909 2344 cmd->se_tfo->get_fabric_name(),
c66ac9db 2345 se_sess->se_node_acl->initiatorname,
e3d6f909 2346 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2347 pr_res_holder->pr_reg_nacl->initiatorname);
2348
2349 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2350 ret = TCM_RESERVATION_CONFLICT;
2351 goto out_put_pr_reg;
c66ac9db
NB		 2352 }
2353 /*
2354 * From spc4r17 Section 5.7.9: Reserving:
2355 *
2356 * If the device server receives a PERSISTENT RESERVE OUT
2357 * command with RESERVE service action where the TYPE field and
2358 * the SCOPE field contain the same values as the existing type
2359 * and scope from a persistent reservation holder, it shall not
2360 * make any change to the existing persistent reservation and
2361 * shall completethe command with GOOD status.
2362 */
2363 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2364 ret = 0;
2365 goto out_put_pr_reg;
c66ac9db
NB		 2366 }
2367 /*
2368 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2369 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2370 */
2371 pr_reg->pr_res_scope = scope;
2372 pr_reg->pr_res_type = type;
2373 pr_reg->pr_res_holder = 1;
2374 dev->dev_pr_res_holder = pr_reg;
d2843c17 2375 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2376
6708bb27 2377 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2378 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2379 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2380 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2381 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2382 cmd->se_tfo->get_fabric_name(),
c66ac9db 2383 se_sess->se_node_acl->initiatorname,
d2843c17 2384 i_buf);
c66ac9db
NB		 2385 spin_unlock(&dev->dev_reservation_lock);
2386
459f213b
AG		 2387 if (pr_tmpl->pr_aptpl_active)
2388 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2389
de103c93
CH		 2390 ret = 0;
2391out_put_pr_reg:
c66ac9db 2392 core_scsi3_put_pr_reg(pr_reg);
de103c93 2393 return ret;
c66ac9db
NB		 2394}
2395
de103c93
CH		 2396static sense_reason_t
2397core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2398 u64 res_key)
c66ac9db 2399{
c66ac9db
NB		 2400 switch (type) {
2401 case PR_TYPE_WRITE_EXCLUSIVE:
2402 case PR_TYPE_EXCLUSIVE_ACCESS:
2403 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2404 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2405 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2406 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2407 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2408 default:
6708bb27 2409 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2410 " 0x%02x\n", type);
de103c93 2411 return TCM_INVALID_CDB_FIELD;
c66ac9db 2412 }
c66ac9db
NB		 2413}
2414
2415/*
2416 * Called with struct se_device->dev_reservation_lock held.
2417 */
2418static void __core_scsi3_complete_pro_release(
2419 struct se_device *dev,
2420 struct se_node_acl *se_nacl,
2421 struct t10_pr_registration *pr_reg,
6c3c9baa
NB		 2422 int explicit,
2423 int unreg)
c66ac9db 2424{
9ac8928e 2425 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
c66ac9db 2426 char i_buf[PR_REG_ISID_ID_LEN];
6c3c9baa 2427 int pr_res_type = 0, pr_res_scope = 0;
c66ac9db
NB		 2428
2429 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2430 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2431 /*
2432 * Go ahead and release the current PR reservation holder.
6c3c9baa
NB		 2433 * If an All Registrants reservation is currently active and
2434 * a unregister operation is requested, replace the current
2435 * dev_pr_res_holder with another active registration.
2436 */
2437 if (dev->dev_pr_res_holder) {
2438 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2439 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2440 dev->dev_pr_res_holder->pr_res_type = 0;
2441 dev->dev_pr_res_holder->pr_res_scope = 0;
2442 dev->dev_pr_res_holder->pr_res_holder = 0;
2443 dev->dev_pr_res_holder = NULL;
2444 }
2445 if (!unreg)
2446 goto out;
c66ac9db 2447
6c3c9baa
NB		 2448 spin_lock(&dev->t10_pr.registration_lock);
2449 list_del_init(&pr_reg->pr_reg_list);
2450 /*
2451 * If the I_T nexus is a reservation holder, the persistent reservation
2452 * is of an all registrants type, and the I_T nexus is the last remaining
2453 * registered I_T nexus, then the device server shall also release the
2454 * persistent reservation.
2455 */
2456 if (!list_empty(&dev->t10_pr.registration_list) &&
2457 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2458 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2459 dev->dev_pr_res_holder =
2460 list_entry(dev->t10_pr.registration_list.next,
2461 struct t10_pr_registration, pr_reg_list);
2462 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2463 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2464 dev->dev_pr_res_holder->pr_res_holder = 1;
2465 }
2466 spin_unlock(&dev->t10_pr.registration_lock);
2467out:
2468 if (!dev->dev_pr_res_holder) {
2469 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2470 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2471 tfo->get_fabric_name(), (explicit) ? "explicit" :
2472 "implicit", core_scsi3_pr_dump_type(pr_res_type),
2473 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2474 }
6708bb27 2475 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2476 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2477 i_buf);
c66ac9db
NB		 2478 /*
2479 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2480 */
2481 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2482}
2483
de103c93
CH		 2484static sense_reason_t
2485core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2486 u64 res_key)
c66ac9db
NB		 2487{
2488 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2489 struct se_session *se_sess = cmd->se_sess;
2490 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2491 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2492 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93 2493 sense_reason_t ret = 0;
c66ac9db 2494
6708bb27
AG		 2495 if (!se_sess || !se_lun) {
2496 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2497 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2498 }
2499 /*
2500 * Locate the existing *pr_reg via struct se_node_acl pointers
2501 */
2502 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2503 if (!pr_reg) {
2504 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2505 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2506 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2507 }
2508 /*
2509 * From spc4r17 Section 5.7.11.2 Releasing:
2510 *
2511 * If there is no persistent reservation or in response to a persistent
2512 * reservation release request from a registered I_T nexus that is not a
2513 * persistent reservation holder (see 5.7.10), the device server shall
2514 * do the following:
2515 *
2516 * a) Not release the persistent reservation, if any;
2517 * b) Not remove any registrations; and
2518 * c) Complete the command with GOOD status.
2519 */
2520 spin_lock(&dev->dev_reservation_lock);
2521 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2522 if (!pr_res_holder) {
c66ac9db
NB		 2523 /*
2524 * No persistent reservation, return GOOD status.
2525 */
2526 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2527 goto out_put_pr_reg;
c66ac9db 2528 }
c66ac9db 2529
e673dc92 2530 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2531 /*
c66ac9db
NB		 2532 * Release request from a registered I_T nexus that is not a
2533 * persistent reservation holder. return GOOD status.
2534 */
2535 spin_unlock(&dev->dev_reservation_lock);
de103c93 2536 goto out_put_pr_reg;
c66ac9db 2537 }
de103c93 2538
c66ac9db
NB		 2539 /*
2540 * From spc4r17 Section 5.7.11.2 Releasing:
2541 *
2542 * Only the persistent reservation holder (see 5.7.10) is allowed to
2543 * release a persistent reservation.
2544 *
2545 * An application client releases the persistent reservation by issuing
2546 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2547 * an I_T nexus that is a persistent reservation holder with the
2548 * following parameters:
2549 *
2550 * a) RESERVATION KEY field set to the value of the reservation key
2551 * that is registered with the logical unit for the I_T nexus;
2552 */
2553 if (res_key != pr_reg->pr_res_key) {
6708bb27 2554 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2555 " does not match existing SA REGISTER res_key:"
2556 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2557 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2558 ret = TCM_RESERVATION_CONFLICT;
2559 goto out_put_pr_reg;
c66ac9db
NB		 2560 }
2561 /*
2562 * From spc4r17 Section 5.7.11.2 Releasing and above:
2563 *
2564 * b) TYPE field and SCOPE field set to match the persistent
2565 * reservation being released.
2566 */
2567 if ((pr_res_holder->pr_res_type != type) ||
2568 (pr_res_holder->pr_res_scope != scope)) {
2569 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2570 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2571 " reservation from [%s]: %s with different TYPE "
2572 "and/or SCOPE while reservation already held by"
2573 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2574 cmd->se_tfo->get_fabric_name(),
c66ac9db 2575 se_sess->se_node_acl->initiatorname,
e3d6f909 2576 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2577 pr_res_holder->pr_reg_nacl->initiatorname);
2578
2579 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2580 ret = TCM_RESERVATION_CONFLICT;
2581 goto out_put_pr_reg;
c66ac9db
NB		 2582 }
2583 /*
2584 * In response to a persistent reservation release request from the
2585 * persistent reservation holder the device server shall perform a
2586 * release by doing the following as an uninterrupted series of actions:
2587 * a) Release the persistent reservation;
2588 * b) Not remove any registration(s);
2589 * c) If the released persistent reservation is a registrants only type
2590 * or all registrants type persistent reservation,
2591 * the device server shall establish a unit attention condition for
2592 * the initiator port associated with every regis-
2593 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2594 * RESERVE OUT command with RELEASE service action was received,
2595 * with the additional sense code set to RESERVATIONS RELEASED; and
2596 * d) If the persistent reservation is of any other type, the device
2597 * server shall not establish a unit attention condition.
2598 */
2599 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
6c3c9baa 2600 pr_reg, 1, 0);
c66ac9db
NB		 2601
2602 spin_unlock(&dev->dev_reservation_lock);
2603
2604 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2605 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2606 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2607 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2608 /*
2609 * If no UNIT ATTENTION conditions will be established for
2610 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2611 * go ahead and check for APTPL=1 update+write below
2612 */
2613 goto write_aptpl;
2614 }
2615
2616 spin_lock(&pr_tmpl->registration_lock);
2617 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2618 pr_reg_list) {
2619 /*
2620 * Do not establish a UNIT ATTENTION condition
2621 * for the calling I_T Nexus
2622 */
2623 if (pr_reg_p == pr_reg)
2624 continue;
2625
2626 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2627 pr_reg_p->pr_res_mapped_lun,
2628 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2629 }
2630 spin_unlock(&pr_tmpl->registration_lock);
2631
2632write_aptpl:
459f213b
AG		 2633 if (pr_tmpl->pr_aptpl_active)
2634 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2635
de103c93 2636out_put_pr_reg:
c66ac9db 2637 core_scsi3_put_pr_reg(pr_reg);
de103c93 2638 return ret;
c66ac9db
NB		 2639}
2640
de103c93
CH		 2641static sense_reason_t
2642core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2643{
2644 struct se_device *dev = cmd->se_dev;
2645 struct se_node_acl *pr_reg_nacl;
e3d6f909 2646 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2647 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2648 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2649 u32 pr_res_mapped_lun = 0;
2650 int calling_it_nexus = 0;
2651 /*
2652 * Locate the existing *pr_reg via struct se_node_acl pointers
2653 */
5951146d 2654 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2655 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2656 if (!pr_reg_n) {
2657 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2658 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2659 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2660 }
2661 /*
2662 * From spc4r17 section 5.7.11.6, Clearing:
2663 *
2664 * Any application client may release the persistent reservation and
2665 * remove all registrations from a device server by issuing a
2666 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2667 * registered I_T nexus with the following parameter:
2668 *
2669 * a) RESERVATION KEY field set to the value of the reservation key
2670 * that is registered with the logical unit for the I_T nexus.
2671 */
2672 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2673 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2674 " res_key: 0x%016Lx does not match"
2675 " existing SA REGISTER res_key:"
2676 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2677 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2678 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2679 }
2680 /*
2681 * a) Release the persistent reservation, if any;
2682 */
2683 spin_lock(&dev->dev_reservation_lock);
2684 pr_res_holder = dev->dev_pr_res_holder;
2685 if (pr_res_holder) {
2686 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2687 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 2688 pr_res_holder, 0, 0);
c66ac9db
NB		 2689 }
2690 spin_unlock(&dev->dev_reservation_lock);
2691 /*
2692 * b) Remove all registration(s) (see spc4r17 5.7.7);
2693 */
2694 spin_lock(&pr_tmpl->registration_lock);
2695 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2696 &pr_tmpl->registration_list, pr_reg_list) {
2697
2698 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2699 pr_reg_nacl = pr_reg->pr_reg_nacl;
2700 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2701 __core_scsi3_free_registration(dev, pr_reg, NULL,
2702 calling_it_nexus);
2703 /*
2704 * e) Establish a unit attention condition for the initiator
2705 * port associated with every registered I_T nexus other
2706 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2707 * command with CLEAR service action was received, with the
2708 * additional sense code set to RESERVATIONS PREEMPTED.
2709 */
6708bb27 2710 if (!calling_it_nexus)
c66ac9db
NB		 2711 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2712 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2713 }
2714 spin_unlock(&pr_tmpl->registration_lock);
2715
6708bb27 2716 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2717 cmd->se_tfo->get_fabric_name());
c66ac9db 2718
459f213b 2719 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2720
2721 core_scsi3_pr_generation(dev);
2722 return 0;
2723}
2724
2725/*
2726 * Called with struct se_device->dev_reservation_lock held.
2727 */
2728static void __core_scsi3_complete_pro_preempt(
2729 struct se_device *dev,
2730 struct t10_pr_registration *pr_reg,
2731 struct list_head *preempt_and_abort_list,
2732 int type,
2733 int scope,
33ce6a87 2734 enum preempt_type preempt_type)
c66ac9db
NB		 2735{
2736 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
9ac8928e 2737 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 2738 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2739
2740 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2741 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2742 /*
125d0119 2743 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2744 */
2745 if (dev->dev_pr_res_holder)
2746 __core_scsi3_complete_pro_release(dev, nacl,
6c3c9baa 2747 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2748
2749 dev->dev_pr_res_holder = pr_reg;
2750 pr_reg->pr_res_holder = 1;
2751 pr_reg->pr_res_type = type;
2752 pr_reg->pr_res_scope = scope;
2753
6708bb27 2754 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2755 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2756 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2757 core_scsi3_pr_dump_type(type),
2758 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2759 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2760 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2761 nacl->initiatorname, i_buf);
c66ac9db
NB		 2762 /*
2763 * For PREEMPT_AND_ABORT, add the preempting reservation's
2764 * struct t10_pr_registration to the list that will be compared
2765 * against received CDBs..
2766 */
2767 if (preempt_and_abort_list)
2768 list_add_tail(&pr_reg->pr_reg_abort_list,
2769 preempt_and_abort_list);
2770}
2771
2772static void core_scsi3_release_preempt_and_abort(
2773 struct list_head *preempt_and_abort_list,
2774 struct t10_pr_registration *pr_reg_holder)
2775{
2776 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2777
2778 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2779 pr_reg_abort_list) {
2780
2781 list_del(&pr_reg->pr_reg_abort_list);
2782 if (pr_reg_holder == pr_reg)
2783 continue;
2784 if (pr_reg->pr_res_holder) {
6708bb27 2785 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2786 continue;
2787 }
2788
2789 pr_reg->pr_reg_deve = NULL;
2790 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2791 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2792 }
2793}
2794
de103c93
CH		 2795static sense_reason_t
2796core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2797 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2798{
5951146d 2799 struct se_device *dev = cmd->se_dev;
c66ac9db 2800 struct se_node_acl *pr_reg_nacl;
e3d6f909 2801 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2802 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2803 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2804 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2805 u32 pr_res_mapped_lun = 0;
b6932ee3
SA		 2806 int all_reg = 0, calling_it_nexus = 0;
2807 bool sa_res_key_unmatched = sa_res_key != 0;
de103c93 2808 int prh_type = 0, prh_scope = 0;
c66ac9db 2809
de103c93
CH		 2810 if (!se_sess)
2811 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2812
5951146d 2813 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2814 se_sess);
6708bb27
AG		 2815 if (!pr_reg_n) {
2816 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2817 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2818 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2819 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2820 }
2821 if (pr_reg_n->pr_res_key != res_key) {
2822 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2823 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2824 }
2825 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2826 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2827 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2828 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2829 }
c66ac9db
NB		 2830
2831 spin_lock(&dev->dev_reservation_lock);
2832 pr_res_holder = dev->dev_pr_res_holder;
2833 if (pr_res_holder &&
2834 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2835 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2836 all_reg = 1;
2837
6708bb27 2838 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2839 spin_unlock(&dev->dev_reservation_lock);
2840 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2841 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2842 }
2843 /*
2844 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2845 *
2846 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2847 * persistent reservation holder or there is no persistent reservation
2848 * holder (i.e., there is no persistent reservation), then the device
2849 * server shall perform a preempt by doing the following in an
2850 * uninterrupted series of actions. (See below..)
2851 */
6708bb27 2852 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2853 /*
2854 * No existing or SA Reservation Key matching reservations..
2855 *
2856 * PROUT SA PREEMPT with All Registrant type reservations are
2857 * allowed to be processed without a matching SA Reservation Key
2858 */
2859 spin_lock(&pr_tmpl->registration_lock);
2860 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2861 &pr_tmpl->registration_list, pr_reg_list) {
2862 /*
2863 * Removing of registrations in non all registrants
2864 * type reservations without a matching SA reservation
2865 * key.
2866 *
2867 * a) Remove the registrations for all I_T nexuses
2868 * specified by the SERVICE ACTION RESERVATION KEY
2869 * field;
2870 * b) Ignore the contents of the SCOPE and TYPE fields;
2871 * c) Process tasks as defined in 5.7.1; and
2872 * d) Establish a unit attention condition for the
2873 * initiator port associated with every I_T nexus
2874 * that lost its registration other than the I_T
2875 * nexus on which the PERSISTENT RESERVE OUT command
2876 * was received, with the additional sense code set
2877 * to REGISTRATIONS PREEMPTED.
2878 */
6708bb27 2879 if (!all_reg) {
c66ac9db
NB		 2880 if (pr_reg->pr_res_key != sa_res_key)
2881 continue;
b6932ee3 2882 sa_res_key_unmatched = false;
c66ac9db
NB		 2883
2884 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2885 pr_reg_nacl = pr_reg->pr_reg_nacl;
2886 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2887 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2888 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2889 NULL, calling_it_nexus);
c66ac9db
NB		 2890 } else {
2891 /*
2892 * Case for any existing all registrants type
2893 * reservation, follow logic in spc4r17 section
2894 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2895 *
2896 * For a ZERO SA Reservation key, release
125d0119 2897 * all other registrations and do an implicit
c66ac9db
NB		 2898 * release of active persistent reservation.
2899 *
2900 * For a non-ZERO SA Reservation key, only
2901 * release the matching reservation key from
2902 * registrations.
2903 */
2904 if ((sa_res_key) &&
2905 (pr_reg->pr_res_key != sa_res_key))
2906 continue;
b6932ee3 2907 sa_res_key_unmatched = false;
c66ac9db
NB		 2908
2909 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2910 if (calling_it_nexus)
2911 continue;
2912
2913 pr_reg_nacl = pr_reg->pr_reg_nacl;
2914 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2915 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2916 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2917 NULL, 0);
c66ac9db 2918 }
6708bb27 2919 if (!calling_it_nexus)
c66ac9db
NB		 2920 core_scsi3_ua_allocate(pr_reg_nacl,
2921 pr_res_mapped_lun, 0x2A,
9e08e34e 2922 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2923 }
2924 spin_unlock(&pr_tmpl->registration_lock);
2925 /*
2926 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2927 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2928 * RESERVATION KEY field to a value that does not match any
2929 * registered reservation key, then the device server shall
2930 * complete the command with RESERVATION CONFLICT status.
2931 */
b6932ee3 2932 if (sa_res_key_unmatched) {
c66ac9db
NB		 2933 spin_unlock(&dev->dev_reservation_lock);
2934 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2935 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2936 }
2937 /*
2938 * For an existing all registrants type reservation
2939 * with a zero SA rservation key, preempt the existing
2940 * reservation with the new PR type and scope.
2941 */
2942 if (pr_res_holder && all_reg && !(sa_res_key)) {
2943 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2944 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2945 type, scope, preempt_type);
c66ac9db 2946
33ce6a87 2947 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2948 core_scsi3_release_preempt_and_abort(
2949 &preempt_and_abort_list, pr_reg_n);
2950 }
2951 spin_unlock(&dev->dev_reservation_lock);
2952
459f213b
AG		 2953 if (pr_tmpl->pr_aptpl_active)
2954 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2955
2956 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2957 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2958 return 0;
2959 }
2960 /*
2961 * The PREEMPTing SA reservation key matches that of the
2962 * existing persistent reservation, first, we check if
2963 * we are preempting our own reservation.
2964 * From spc4r17, section 5.7.11.4.3 Preempting
2965 * persistent reservations and registration handling
2966 *
2967 * If an all registrants persistent reservation is not
2968 * present, it is not an error for the persistent
2969 * reservation holder to preempt itself (i.e., a
2970 * PERSISTENT RESERVE OUT with a PREEMPT service action
2971 * or a PREEMPT AND ABORT service action with the
2972 * SERVICE ACTION RESERVATION KEY value equal to the
2973 * persistent reservation holder's reservation key that
2974 * is received from the persistent reservation holder).
2975 * In that case, the device server shall establish the
2976 * new persistent reservation and maintain the
2977 * registration.
2978 */
2979 prh_type = pr_res_holder->pr_res_type;
2980 prh_scope = pr_res_holder->pr_res_scope;
2981 /*
2982 * If the SERVICE ACTION RESERVATION KEY field identifies a
2983 * persistent reservation holder (see 5.7.10), the device
2984 * server shall perform a preempt by doing the following as
2985 * an uninterrupted series of actions:
2986 *
2987 * a) Release the persistent reservation for the holder
2988 * identified by the SERVICE ACTION RESERVATION KEY field;
2989 */
2990 if (pr_reg_n != pr_res_holder)
2991 __core_scsi3_complete_pro_release(dev,
6c3c9baa
NB		 2992 pr_res_holder->pr_reg_nacl,
2993 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2994 /*
2995 * b) Remove the registrations for all I_T nexuses identified
2996 * by the SERVICE ACTION RESERVATION KEY field, except the
2997 * I_T nexus that is being used for the PERSISTENT RESERVE
2998 * OUT command. If an all registrants persistent reservation
2999 * is present and the SERVICE ACTION RESERVATION KEY field
3000 * is set to zero, then all registrations shall be removed
3001 * except for that of the I_T nexus that is being used for
3002 * the PERSISTENT RESERVE OUT command;
3003 */
3004 spin_lock(&pr_tmpl->registration_lock);
3005 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3006 &pr_tmpl->registration_list, pr_reg_list) {
3007
3008 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3009 if (calling_it_nexus)
3010 continue;
3011
3012 if (pr_reg->pr_res_key != sa_res_key)
3013 continue;
3014
3015 pr_reg_nacl = pr_reg->pr_reg_nacl;
3016 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3017 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3018 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3019 calling_it_nexus);
3020 /*
3021 * e) Establish a unit attention condition for the initiator
3022 * port associated with every I_T nexus that lost its
3023 * persistent reservation and/or registration, with the
3024 * additional sense code set to REGISTRATIONS PREEMPTED;
3025 */
3026 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3027 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3028 }
3029 spin_unlock(&pr_tmpl->registration_lock);
3030 /*
3031 * c) Establish a persistent reservation for the preempting
3032 * I_T nexus using the contents of the SCOPE and TYPE fields;
3033 */
3034 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3035 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3036 type, scope, preempt_type);
c66ac9db
NB		 3037 /*
3038 * d) Process tasks as defined in 5.7.1;
3039 * e) See above..
3040 * f) If the type or scope has changed, then for every I_T nexus
3041 * whose reservation key was not removed, except for the I_T
3042 * nexus on which the PERSISTENT RESERVE OUT command was
3043 * received, the device server shall establish a unit
3044 * attention condition for the initiator port associated with
3045 * that I_T nexus, with the additional sense code set to
3046 * RESERVATIONS RELEASED. If the type or scope have not
3047 * changed, then no unit attention condition(s) shall be
3048 * established for this reason.
3049 */
3050 if ((prh_type != type) || (prh_scope != scope)) {
3051 spin_lock(&pr_tmpl->registration_lock);
3052 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3053 &pr_tmpl->registration_list, pr_reg_list) {
3054
3055 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3056 if (calling_it_nexus)
3057 continue;
3058
3059 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3060 pr_reg->pr_res_mapped_lun, 0x2A,
3061 ASCQ_2AH_RESERVATIONS_RELEASED);
3062 }
3063 spin_unlock(&pr_tmpl->registration_lock);
3064 }
3065 spin_unlock(&dev->dev_reservation_lock);
3066 /*
3067 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3068 * All received CDBs for the matching existing reservation and
3069 * registrations undergo ABORT_TASK logic.
3070 *
3071 * From there, core_scsi3_release_preempt_and_abort() will
3072 * release every registration in the list (which have already
3073 * been removed from the primary pr_reg list), except the
3074 * new persistent reservation holder, the calling Initiator Port.
3075 */
33ce6a87 3076 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3077 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3078 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3079 pr_reg_n);
3080 }
3081
459f213b
AG		 3082 if (pr_tmpl->pr_aptpl_active)
3083 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3084
3085 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3086 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3087 return 0;
3088}
3089
de103c93
CH		 3090static sense_reason_t
3091core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3092 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3093{
c66ac9db
NB		 3094 switch (type) {
3095 case PR_TYPE_WRITE_EXCLUSIVE:
3096 case PR_TYPE_EXCLUSIVE_ACCESS:
3097 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3098 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3099 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3100 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3101 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3102 sa_res_key, preempt_type);
c66ac9db 3103 default:
6708bb27 3104 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3105 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3106 return TCM_INVALID_CDB_FIELD;
c66ac9db 3107 }
c66ac9db
NB		 3108}
3109
3110
de103c93
CH		 3111static sense_reason_t
3112core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3113 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3114{
e3d6f909 3115 struct se_session *se_sess = cmd->se_sess;
5951146d 3116 struct se_device *dev = cmd->se_dev;
28168905 3117 struct se_dev_entry *dest_se_deve = NULL;
adf653f9 3118 struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
c66ac9db 3119 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
c66ac9db 3120 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
9ac8928e 3121 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
c66ac9db 3122 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3123 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3124 unsigned char *buf;
2650d71e 3125 const unsigned char *initiator_str;
13ba564c 3126 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
c66ac9db 3127 u32 tid_len, tmp_tid_len;
d2843c17 3128 int new_reg = 0, type, scope, matching_iname;
de103c93 3129 sense_reason_t ret;
c66ac9db
NB		 3130 unsigned short rtpi;
3131 unsigned char proto_ident;
3132
6708bb27
AG		 3133 if (!se_sess || !se_lun) {
3134 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3135 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3136 }
de103c93 3137
c66ac9db
NB		 3138 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3139 se_tpg = se_sess->se_tpg;
e3d6f909 3140 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3141 /*
3142 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3143 * Register behaviors for a REGISTER AND MOVE service action
3144 *
3145 * Locate the existing *pr_reg via struct se_node_acl pointers
3146 */
5951146d 3147 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3148 se_sess);
6708bb27
AG		 3149 if (!pr_reg) {
3150 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3151 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3152 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3153 }
3154 /*
3155 * The provided reservation key much match the existing reservation key
3156 * provided during this initiator's I_T nexus registration.
3157 */
3158 if (res_key != pr_reg->pr_res_key) {
6708bb27 3159 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3160 " res_key: 0x%016Lx does not match existing SA REGISTER"
3161 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3162 ret = TCM_RESERVATION_CONFLICT;
3163 goto out_put_pr_reg;
c66ac9db
NB		 3164 }
3165 /*
3166 * The service active reservation key needs to be non zero
3167 */
6708bb27
AG		 3168 if (!sa_res_key) {
3169 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3170 " sa_res_key\n");
de103c93
CH		 3171 ret = TCM_INVALID_PARAMETER_LIST;
3172 goto out_put_pr_reg;
c66ac9db 3173 }
05d1c7c0 3174
c66ac9db
NB		 3175 /*
3176 * Determine the Relative Target Port Identifier where the reservation
3177 * will be moved to for the TransportID containing SCSI initiator WWN
3178 * information.
3179 */
4949314c 3180 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3181 if (!buf) {
3182 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3183 goto out_put_pr_reg;
3184 }
3185
c66ac9db
NB		 3186 rtpi = (buf[18] & 0xff) << 8;
3187 rtpi |= buf[19] & 0xff;
3188 tid_len = (buf[20] & 0xff) << 24;
3189 tid_len |= (buf[21] & 0xff) << 16;
3190 tid_len |= (buf[22] & 0xff) << 8;
3191 tid_len |= buf[23] & 0xff;
4949314c 3192 transport_kunmap_data_sg(cmd);
05d1c7c0 3193 buf = NULL;
c66ac9db
NB		 3194
3195 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3196 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3197 " does not equal CDB data_length: %u\n", tid_len,
3198 cmd->data_length);
de103c93
CH		 3199 ret = TCM_INVALID_PARAMETER_LIST;
3200 goto out_put_pr_reg;
c66ac9db
NB		 3201 }
3202
3203 spin_lock(&dev->se_port_lock);
adf653f9
CH		 3204 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3205 if (tmp_lun->lun_rtpi != rtpi)
c66ac9db 3206 continue;
adf653f9 3207 dest_se_tpg = tmp_lun->lun_tpg;
e3d6f909 3208 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3209 if (!dest_tf_ops)
c66ac9db
NB		 3210 continue;
3211
33940d09 3212 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
c66ac9db
NB		 3213 spin_unlock(&dev->se_port_lock);
3214
de103c93 3215 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3216 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db 3217 " for dest_se_tpg\n");
33940d09 3218 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
de103c93
CH		 3219 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3220 goto out_put_pr_reg;
c66ac9db
NB		 3221 }
3222
3223 spin_lock(&dev->se_port_lock);
3224 break;
3225 }
3226 spin_unlock(&dev->se_port_lock);
3227
6708bb27
AG		 3228 if (!dest_se_tpg || !dest_tf_ops) {
3229 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3230 " fabric ops from Relative Target Port Identifier:"
3231 " %hu\n", rtpi);
de103c93
CH		 3232 ret = TCM_INVALID_PARAMETER_LIST;
3233 goto out_put_pr_reg;
c66ac9db 3234 }
05d1c7c0 3235
4949314c 3236 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3237 if (!buf) {
3238 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3239 goto out_put_pr_reg;
3240 }
c66ac9db 3241 proto_ident = (buf[24] & 0x0f);
8b1e1244 3242
6708bb27 3243 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3244 " 0x%02x\n", proto_ident);
8b1e1244 3245
2aeeafae 3246 if (proto_ident != dest_se_tpg->proto_id) {
6708bb27 3247 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3248 " proto_ident: 0x%02x does not match ident: 0x%02x"
3249 " from fabric: %s\n", proto_ident,
2aeeafae 3250 dest_se_tpg->proto_id,
c66ac9db 3251 dest_tf_ops->get_fabric_name());
de103c93 3252 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3253 goto out;
3254 }
2650d71e 3255 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
c66ac9db 3256 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3257 if (!initiator_str) {
3258 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3259 " initiator_str from Transport ID\n");
de103c93 3260 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3261 goto out;
3262 }
3263
4949314c 3264 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3265 buf = NULL;
3266
6708bb27 3267 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3268 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3269 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3270 iport_ptr : "");
3271 /*
3272 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3273 * action specifies a TransportID that is the same as the initiator port
3274 * of the I_T nexus for the command received, then the command shall
3275 * be terminated with CHECK CONDITION status, with the sense key set to
3276 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3277 * IN PARAMETER LIST.
3278 */
3279 pr_reg_nacl = pr_reg->pr_reg_nacl;
3280 matching_iname = (!strcmp(initiator_str,
3281 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3282 if (!matching_iname)
c66ac9db
NB		 3283 goto after_iport_check;
3284
6708bb27
AG		 3285 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3286 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3287 " matches: %s on received I_T Nexus\n", initiator_str,
3288 pr_reg_nacl->initiatorname);
de103c93 3289 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3290 goto out;
3291 }
6708bb27
AG		 3292 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3293 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3294 " matches: %s %s on received I_T Nexus\n",
3295 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3296 pr_reg->pr_reg_isid);
de103c93 3297 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3298 goto out;
3299 }
3300after_iport_check:
3301 /*
3302 * Locate the destination struct se_node_acl from the received Transport ID
3303 */
403edd78 3304 mutex_lock(&dest_se_tpg->acl_node_mutex);
c66ac9db
NB		 3305 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3306 initiator_str);
33940d09
JE		 3307 if (dest_node_acl)
3308 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
403edd78 3309 mutex_unlock(&dest_se_tpg->acl_node_mutex);
c66ac9db 3310
6708bb27
AG		 3311 if (!dest_node_acl) {
3312 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3313 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3314 initiator_str);
de103c93 3315 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3316 goto out;
3317 }
de103c93
CH		 3318
3319 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3320 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db 3321 " dest_node_acl\n");
33940d09 3322 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 3323 dest_node_acl = NULL;
de103c93 3324 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3325 goto out;
3326 }
8b1e1244 3327
6708bb27 3328 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3329 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3330 dest_node_acl->initiatorname);
8b1e1244 3331
c66ac9db
NB		 3332 /*
3333 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3334 * PORT IDENTIFIER.
3335 */
3336 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3337 if (!dest_se_deve) {
3338 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3339 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3340 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3341 goto out;
3342 }
3343
de103c93 3344 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3345 pr_err("core_scsi3_lunacl_depend_item() failed\n");
29a05dee 3346 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
c66ac9db 3347 dest_se_deve = NULL;
de103c93 3348 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3349 goto out;
3350 }
8b1e1244 3351
6708bb27 3352 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3353 " ACL for dest_se_deve->mapped_lun: %u\n",
3354 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3355 dest_se_deve->mapped_lun);
8b1e1244 3356
c66ac9db
NB		 3357 /*
3358 * A persistent reservation needs to already existing in order to
3359 * successfully complete the REGISTER_AND_MOVE service action..
3360 */
3361 spin_lock(&dev->dev_reservation_lock);
3362 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3363 if (!pr_res_holder) {
3364 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3365 " currently held\n");
3366 spin_unlock(&dev->dev_reservation_lock);
de103c93 3367 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3368 goto out;
3369 }
3370 /*
3371 * The received on I_T Nexus must be the reservation holder.
3372 *
3373 * From spc4r17 section 5.7.8 Table 50 --
3374 * Register behaviors for a REGISTER AND MOVE service action
3375 */
e673dc92 3376 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
6708bb27 3377 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3378 " Nexus is not reservation holder\n");
3379 spin_unlock(&dev->dev_reservation_lock);
de103c93 3380 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3381 goto out;
3382 }
3383 /*
3384 * From spc4r17 section 5.7.8: registering and moving reservation
3385 *
3386 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3387 * action is received and the established persistent reservation is a
3388 * Write Exclusive - All Registrants type or Exclusive Access -
3389 * All Registrants type reservation, then the command shall be completed
3390 * with RESERVATION CONFLICT status.
3391 */
3392 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3393 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3394 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3395 " reservation for type: %s\n",
3396 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3397 spin_unlock(&dev->dev_reservation_lock);
de103c93 3398 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3399 goto out;
3400 }
3401 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3402 /*
3403 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3404 */
3405 type = pr_res_holder->pr_res_type;
3406 scope = pr_res_holder->pr_res_type;
3407 /*
3408 * c) Associate the reservation key specified in the SERVICE ACTION
3409 * RESERVATION KEY field with the I_T nexus specified as the
3410 * destination of the register and move, where:
3411 * A) The I_T nexus is specified by the TransportID and the
3412 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3413 * B) Regardless of the TransportID format used, the association for
3414 * the initiator port is based on either the initiator port name
3415 * (see 3.1.71) on SCSI transport protocols where port names are
3416 * required or the initiator port identifier (see 3.1.70) on SCSI
3417 * transport protocols where port names are not required;
3418 * d) Register the reservation key specified in the SERVICE ACTION
3419 * RESERVATION KEY field;
3420 * e) Retain the reservation key specified in the SERVICE ACTION
3421 * RESERVATION KEY field and associated information;
3422 *
3423 * Also, It is not an error for a REGISTER AND MOVE service action to
3424 * register an I_T nexus that is already registered with the same
3425 * reservation key or a different reservation key.
3426 */
3427 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3428 iport_ptr);
6708bb27 3429 if (!dest_pr_reg) {
79dc9c9e
NB		 3430 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3431 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
3432
80bfdfa9 3433 spin_unlock(&dev->dev_reservation_lock);
79dc9c9e
NB		 3434 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3435 dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3436 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
de103c93 3437 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3438 goto out;
3439 }
80bfdfa9 3440 spin_lock(&dev->dev_reservation_lock);
c66ac9db
NB		 3441 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3442 iport_ptr);
3443 new_reg = 1;
3444 }
3445 /*
3446 * f) Release the persistent reservation for the persistent reservation
3447 * holder (i.e., the I_T nexus on which the
3448 */
3449 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 3450 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3451 /*
3452 * g) Move the persistent reservation to the specified I_T nexus using
3453 * the same scope and type as the persistent reservation released in
3454 * item f); and
3455 */
3456 dev->dev_pr_res_holder = dest_pr_reg;
3457 dest_pr_reg->pr_res_holder = 1;
3458 dest_pr_reg->pr_res_type = type;
3459 pr_reg->pr_res_scope = scope;
d2843c17 3460 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3461 /*
3462 * Increment PRGeneration for existing registrations..
3463 */
6708bb27 3464 if (!new_reg)
c66ac9db
NB		 3465 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3466 spin_unlock(&dev->dev_reservation_lock);
3467
6708bb27 3468 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3469 " created new reservation holder TYPE: %s on object RTPI:"
3470 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3471 core_scsi3_pr_dump_type(type), rtpi,
3472 dest_pr_reg->pr_res_generation);
6708bb27 3473 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3474 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3475 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3476 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3477 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3478 iport_ptr : "");
3479 /*
3480 * It is now safe to release configfs group dependencies for destination
3481 * of Transport ID Initiator Device/Port Identifier
3482 */
3483 core_scsi3_lunacl_undepend_item(dest_se_deve);
3484 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3485 core_scsi3_tpg_undepend_item(dest_se_tpg);
3486 /*
3487 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3488 * nexus on which PERSISTENT RESERVE OUT command was received.
3489 */
3490 if (unreg) {
3491 spin_lock(&pr_tmpl->registration_lock);
3492 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3493 spin_unlock(&pr_tmpl->registration_lock);
3494 } else
3495 core_scsi3_put_pr_reg(pr_reg);
3496
459f213b 3497 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3498
4949314c 3499 transport_kunmap_data_sg(cmd);
05d1c7c0 3500
c66ac9db
NB		 3501 core_scsi3_put_pr_reg(dest_pr_reg);
3502 return 0;
3503out:
05d1c7c0 3504 if (buf)
4949314c 3505 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3506 if (dest_se_deve)
3507 core_scsi3_lunacl_undepend_item(dest_se_deve);
3508 if (dest_node_acl)
3509 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3510 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3511
3512out_put_pr_reg:
c66ac9db
NB		 3513 core_scsi3_put_pr_reg(pr_reg);
3514 return ret;
3515}
3516
3517static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3518{
3519 unsigned int __v1, __v2;
3520
3521 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3522 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3523
3524 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3525}
3526
3527/*
3528 * See spc4r17 section 6.14 Table 170
3529 */
de103c93
CH		 3530sense_reason_t
3531target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3532{
92404e60 3533 struct se_device *dev = cmd->se_dev;
617c0e06 3534 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3535 unsigned char *buf;
c66ac9db
NB		 3536 u64 res_key, sa_res_key;
3537 int sa, scope, type, aptpl;
3538 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3539 sense_reason_t ret;
617c0e06
CH		 3540
3541 /*
3542 * Following spc2r20 5.5.1 Reservations overview:
3543 *
3544 * If a logical unit has been reserved by any RESERVE command and is
3545 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3546 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3547 * initiator or service action and shall terminate with a RESERVATION
3548 * CONFLICT status.
3549 */
0fd97ccf 3550 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3551 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3552 " SPC-2 reservation is held, returning"
3553 " RESERVATION_CONFLICT\n");
de103c93 3554 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3555 }
3556
c66ac9db
NB		 3557 /*
3558 * FIXME: A NULL struct se_session pointer means an this is not coming from
3559 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3560 */
de103c93
CH		 3561 if (!cmd->se_sess)
3562 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3563
3564 if (cmd->data_length < 24) {
6708bb27 3565 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3566 " length too small: %u\n", cmd->data_length);
de103c93 3567 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3568 }
de103c93 3569
c66ac9db
NB		 3570 /*
3571 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3572 */
3573 sa = (cdb[1] & 0x1f);
3574 scope = (cdb[2] & 0xf0);
3575 type = (cdb[2] & 0x0f);
05d1c7c0 3576
4949314c 3577 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3578 if (!buf)
3579 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3580
c66ac9db
NB		 3581 /*
3582 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3583 */
3584 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3585 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3586 /*
3587 * REGISTER_AND_MOVE uses a different SA parameter list containing
3588 * SCSI TransportIDs.
3589 */
3590 if (sa != PRO_REGISTER_AND_MOVE) {
3591 spec_i_pt = (buf[20] & 0x08);
3592 all_tg_pt = (buf[20] & 0x04);
3593 aptpl = (buf[20] & 0x01);
3594 } else {
3595 aptpl = (buf[17] & 0x01);
3596 unreg = (buf[17] & 0x02);
3597 }
92404e60
NB		 3598 /*
3599 * If the backend device has been configured to force APTPL metadata
3600 * write-out, go ahead and propigate aptpl=1 down now.
3601 */
3602 if (dev->dev_attrib.force_pr_aptpl)
3603 aptpl = 1;
3604
4949314c 3605 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3606 buf = NULL;
3607
c66ac9db
NB		 3608 /*
3609 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3610 */
de103c93
CH		 3611 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3612 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3613
c66ac9db
NB		 3614 /*
3615 * From spc4r17 section 6.14:
3616 *
3617 * If the SPEC_I_PT bit is set to zero, the service action is not
3618 * REGISTER AND MOVE, and the parameter list length is not 24, then
3619 * the command shall be terminated with CHECK CONDITION status, with
3620 * the sense key set to ILLEGAL REQUEST, and the additional sense
3621 * code set to PARAMETER LIST LENGTH ERROR.
3622 */
6708bb27 3623 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3624 (cmd->data_length != 24)) {
6708bb27 3625 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3626 " list length: %u\n", cmd->data_length);
de103c93 3627 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3628 }
de103c93 3629
c66ac9db
NB		 3630 /*
3631 * (core_scsi3_emulate_pro_* function parameters
3632 * are defined by spc4r17 Table 174:
3633 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3634 */
3635 switch (sa) {
3636 case PRO_REGISTER:
d29a5b6a 3637 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3638 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3639 break;
c66ac9db 3640 case PRO_RESERVE:
d29a5b6a
CH		 3641 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3642 break;
c66ac9db 3643 case PRO_RELEASE:
d29a5b6a
CH		 3644 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3645 break;
c66ac9db 3646 case PRO_CLEAR:
d29a5b6a
CH		 3647 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3648 break;
c66ac9db 3649 case PRO_PREEMPT:
d29a5b6a 3650 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3651 res_key, sa_res_key, PREEMPT);
d29a5b6a 3652 break;
c66ac9db 3653 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3654 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3655 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3656 break;
c66ac9db 3657 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3658 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3659 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3660 break;
c66ac9db 3661 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3662 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3663 sa_res_key, aptpl, unreg);
d29a5b6a 3664 break;
c66ac9db 3665 default:
6708bb27 3666 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3667 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3668 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3669 }
3670
6bb35e00
CH		 3671 if (!ret)
3672 target_complete_cmd(cmd, GOOD);
d29a5b6a 3673 return ret;
c66ac9db
NB		 3674}
3675
3676/*
3677 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3678 *
3679 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3680 */
de103c93
CH		 3681static sense_reason_t
3682core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3683{
0fd97ccf 3684 struct se_device *dev = cmd->se_dev;
c66ac9db 3685 struct t10_pr_registration *pr_reg;
05d1c7c0 3686 unsigned char *buf;
c66ac9db
NB		 3687 u32 add_len = 0, off = 8;
3688
3689 if (cmd->data_length < 8) {
6708bb27 3690 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3691 " too small\n", cmd->data_length);
de103c93 3692 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3693 }
3694
4949314c 3695 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3696 if (!buf)
3697 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3698
0fd97ccf
CH		 3699 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3700 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3701 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3702 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3703
0fd97ccf
CH		 3704 spin_lock(&dev->t10_pr.registration_lock);
3705 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3706 pr_reg_list) {
3707 /*
3708 * Check for overflow of 8byte PRI READ_KEYS payload and
3709 * next reservation key list descriptor.
3710 */
3711 if ((add_len + 8) > (cmd->data_length - 8))
3712 break;
3713
3714 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3715 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3716 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3717 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3718 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3719 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3720 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3721 buf[off++] = (pr_reg->pr_res_key & 0xff);
3722
3723 add_len += 8;
3724 }
0fd97ccf 3725 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3726
3727 buf[4] = ((add_len >> 24) & 0xff);
3728 buf[5] = ((add_len >> 16) & 0xff);
3729 buf[6] = ((add_len >> 8) & 0xff);
3730 buf[7] = (add_len & 0xff);
3731
4949314c 3732 transport_kunmap_data_sg(cmd);
05d1c7c0 3733
c66ac9db
NB		 3734 return 0;
3735}
3736
3737/*
3738 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3739 *
3740 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3741 */
de103c93
CH		 3742static sense_reason_t
3743core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3744{
0fd97ccf 3745 struct se_device *dev = cmd->se_dev;
c66ac9db 3746 struct t10_pr_registration *pr_reg;
05d1c7c0 3747 unsigned char *buf;
c66ac9db
NB		 3748 u64 pr_res_key;
3749 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3750
3751 if (cmd->data_length < 8) {
6708bb27 3752 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3753 " too small\n", cmd->data_length);
de103c93 3754 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3755 }
3756
4949314c 3757 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3758 if (!buf)
3759 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3760
0fd97ccf
CH		 3761 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3762 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3763 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3764 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3765
0fd97ccf
CH		 3766 spin_lock(&dev->dev_reservation_lock);
3767 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3768 if (pr_reg) {
c66ac9db
NB		 3769 /*
3770 * Set the hardcoded Additional Length
3771 */
3772 buf[4] = ((add_len >> 24) & 0xff);
3773 buf[5] = ((add_len >> 16) & 0xff);
3774 buf[6] = ((add_len >> 8) & 0xff);
3775 buf[7] = (add_len & 0xff);
3776
05d1c7c0
AG		 3777 if (cmd->data_length < 22)
3778 goto err;
3779
c66ac9db
NB		 3780 /*
3781 * Set the Reservation key.
3782 *
3783 * From spc4r17, section 5.7.10:
3784 * A persistent reservation holder has its reservation key
3785 * returned in the parameter data from a PERSISTENT
3786 * RESERVE IN command with READ RESERVATION service action as
3787 * follows:
3788 * a) For a persistent reservation of the type Write Exclusive
3789 * - All Registrants or Exclusive Access ­ All Regitrants,
3790 * the reservation key shall be set to zero; or
3791 * b) For all other persistent reservation types, the
3792 * reservation key shall be set to the registered
3793 * reservation key for the I_T nexus that holds the
3794 * persistent reservation.
3795 */
3796 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3797 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3798 pr_res_key = 0;
3799 else
3800 pr_res_key = pr_reg->pr_res_key;
3801
3802 buf[8] = ((pr_res_key >> 56) & 0xff);
3803 buf[9] = ((pr_res_key >> 48) & 0xff);
3804 buf[10] = ((pr_res_key >> 40) & 0xff);
3805 buf[11] = ((pr_res_key >> 32) & 0xff);
3806 buf[12] = ((pr_res_key >> 24) & 0xff);
3807 buf[13] = ((pr_res_key >> 16) & 0xff);
3808 buf[14] = ((pr_res_key >> 8) & 0xff);
3809 buf[15] = (pr_res_key & 0xff);
3810 /*
3811 * Set the SCOPE and TYPE
3812 */
3813 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3814 (pr_reg->pr_res_type & 0x0f);
3815 }
05d1c7c0
AG		 3816
3817err:
0fd97ccf 3818 spin_unlock(&dev->dev_reservation_lock);
4949314c 3819 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3820
3821 return 0;
3822}
3823
3824/*
3825 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3826 *
3827 * See spc4r17 section 6.13.4 Table 165
3828 */
de103c93
CH		 3829static sense_reason_t
3830core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3831{
5951146d 3832 struct se_device *dev = cmd->se_dev;
0fd97ccf 3833 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3834 unsigned char *buf;
c66ac9db
NB		 3835 u16 add_len = 8; /* Hardcoded to 8. */
3836
3837 if (cmd->data_length < 6) {
6708bb27 3838 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3839 " %u too small\n", cmd->data_length);
de103c93 3840 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3841 }
3842
4949314c 3843 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3844 if (!buf)
3845 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3846
c435285d 3847 buf[0] = ((add_len >> 8) & 0xff);
c66ac9db
NB		 3848 buf[1] = (add_len & 0xff);
3849 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3850 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3851 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3852 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3853 /*
3854 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3855 * set the TMV: Task Mask Valid bit.
3856 */
3857 buf[3] |= 0x80;
3858 /*
3859 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3860 */
3861 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3862 /*
3863 * PTPL_A: Persistence across Target Power Loss Active bit
3864 */
3865 if (pr_tmpl->pr_aptpl_active)
3866 buf[3] |= 0x01;
3867 /*
3868 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3869 */
3870 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3871 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3872 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3873 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3874 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3875 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3876
4949314c 3877 transport_kunmap_data_sg(cmd);
05d1c7c0 3878
c66ac9db
NB		 3879 return 0;
3880}
3881
3882/*
3883 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3884 *
3885 * See spc4r17 section 6.13.5 Table 168 and 169
3886 */
de103c93
CH		 3887static sense_reason_t
3888core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3889{
0fd97ccf 3890 struct se_device *dev = cmd->se_dev;
c66ac9db 3891 struct se_node_acl *se_nacl;
c66ac9db
NB		 3892 struct se_portal_group *se_tpg;
3893 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3894 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3895 unsigned char *buf;
2650d71e 3896 u32 add_desc_len = 0, add_len = 0;
c66ac9db 3897 u32 off = 8; /* off into first Full Status descriptor */
d16ca7c5 3898 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
2650d71e 3899 int exp_desc_len, desc_len;
d16ca7c5 3900 bool all_reg = false;
c66ac9db
NB		 3901
3902 if (cmd->data_length < 8) {
6708bb27 3903 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3904 " too small\n", cmd->data_length);
de103c93 3905 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3906 }
3907
4949314c 3908 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3909 if (!buf)
3910 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3911
0fd97ccf
CH		 3912 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3913 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3914 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3915 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3916
d16ca7c5
NB		 3917 spin_lock(&dev->dev_reservation_lock);
3918 if (dev->dev_pr_res_holder) {
3919 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3920
3921 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3922 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3923 all_reg = true;
3924 pr_res_type = pr_holder->pr_res_type;
3925 pr_res_scope = pr_holder->pr_res_scope;
3926 }
3927 }
3928 spin_unlock(&dev->dev_reservation_lock);
3929
c66ac9db
NB		 3930 spin_lock(&pr_tmpl->registration_lock);
3931 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3932 &pr_tmpl->registration_list, pr_reg_list) {
3933
3934 se_nacl = pr_reg->pr_reg_nacl;
3935 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3936 add_desc_len = 0;
3937
33940d09 3938 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3939 spin_unlock(&pr_tmpl->registration_lock);
3940 /*
3941 * Determine expected length of $FABRIC_MOD specific
3942 * TransportID full status descriptor..
3943 */
2650d71e
CH		 3944 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3945 &format_code);
3946 if (exp_desc_len < 0 ||
3947 exp_desc_len + add_len > cmd->data_length) {
6708bb27 3948 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3949 " out of buffer: %d\n", cmd->data_length);
3950 spin_lock(&pr_tmpl->registration_lock);
33940d09 3951 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3952 break;
3953 }
3954 /*
3955 * Set RESERVATION KEY
3956 */
3957 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3958 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3959 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3960 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3961 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3962 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3963 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3964 buf[off++] = (pr_reg->pr_res_key & 0xff);
3965 off += 4; /* Skip Over Reserved area */
3966
3967 /*
3968 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3969 */
3970 if (pr_reg->pr_reg_all_tg_pt)
3971 buf[off] = 0x02;
3972 /*
3973 * The struct se_lun pointer will be present for the
3974 * reservation holder for PR_HOLDER bit.
3975 *
3976 * Also, if this registration is the reservation
d16ca7c5
NB		 3977 * holder or there is an All Registrants reservation
3978 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 3979 */
3980 if (pr_reg->pr_res_holder) {
3981 buf[off++] |= 0x01;
3982 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3983 (pr_reg->pr_res_type & 0x0f);
d16ca7c5
NB		 3984 } else if (all_reg) {
3985 buf[off++] |= 0x01;
3986 buf[off++] = (pr_res_scope & 0xf0) |
3987 (pr_res_type & 0x0f);
3988 } else {
c66ac9db 3989 off += 2;
d16ca7c5 3990 }
c66ac9db
NB		 3991
3992 off += 4; /* Skip over reserved area */
3993 /*
3994 * From spc4r17 6.3.15:
3995 *
3996 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3997 * IDENTIFIER field contains the relative port identifier (see
3998 * 3.1.120) of the target port that is part of the I_T nexus
3999 * described by this full status descriptor. If the ALL_TG_PT
4000 * bit is set to one, the contents of the RELATIVE TARGET PORT
4001 * IDENTIFIER field are not defined by this standard.
4002 */
6708bb27 4003 if (!pr_reg->pr_reg_all_tg_pt) {
79dc9c9e 4004 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
c66ac9db 4005
79dc9c9e
NB		 4006 buf[off++] = ((sep_rtpi >> 8) & 0xff);
4007 buf[off++] = (sep_rtpi & 0xff);
c66ac9db 4008 } else
35d1efe8 4009 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db 4010
2650d71e
CH		 4011 buf[off+4] = se_tpg->proto_id;
4012
c66ac9db 4013 /*
2650d71e 4014 * Now, have the $FABRIC_MOD fill in the transport ID.
c66ac9db 4015 */
2650d71e
CH		 4016 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4017 &format_code, &buf[off+4]);
c66ac9db
NB		 4018
4019 spin_lock(&pr_tmpl->registration_lock);
33940d09 4020 atomic_dec_mb(&pr_reg->pr_res_holders);
2650d71e
CH		 4021
4022 if (desc_len < 0)
4023 break;
c66ac9db
NB		 4024 /*
4025 * Set the ADDITIONAL DESCRIPTOR LENGTH
4026 */
4027 buf[off++] = ((desc_len >> 24) & 0xff);
4028 buf[off++] = ((desc_len >> 16) & 0xff);
4029 buf[off++] = ((desc_len >> 8) & 0xff);
4030 buf[off++] = (desc_len & 0xff);
4031 /*
4032 * Size of full desctipor header minus TransportID
4033 * containing $FABRIC_MOD specific) initiator device/port
4034 * WWN information.
4035 *
4036 * See spc4r17 Section 6.13.5 Table 169
4037 */
4038 add_desc_len = (24 + desc_len);
4039
4040 off += desc_len;
4041 add_len += add_desc_len;
4042 }
4043 spin_unlock(&pr_tmpl->registration_lock);
4044 /*
4045 * Set ADDITIONAL_LENGTH
4046 */
4047 buf[4] = ((add_len >> 24) & 0xff);
4048 buf[5] = ((add_len >> 16) & 0xff);
4049 buf[6] = ((add_len >> 8) & 0xff);
4050 buf[7] = (add_len & 0xff);
4051
4949314c 4052 transport_kunmap_data_sg(cmd);
05d1c7c0 4053
c66ac9db
NB		 4054 return 0;
4055}
4056
de103c93
CH		 4057sense_reason_t
4058target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4059{
de103c93 4060 sense_reason_t ret;
e76a35d6 4061
c66ac9db
NB		 4062 /*
4063 * Following spc2r20 5.5.1 Reservations overview:
4064 *
4065 * If a logical unit has been reserved by any RESERVE command and is
4066 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4067 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4068 * initiator or service action and shall terminate with a RESERVATION
4069 * CONFLICT status.
4070 */
0fd97ccf 4071 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4072 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4073 " SPC-2 reservation is held, returning"
4074 " RESERVATION_CONFLICT\n");
de103c93 4075 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4076 }
4077
617c0e06
CH		 4078 switch (cmd->t_task_cdb[1] & 0x1f) {
4079 case PRI_READ_KEYS:
d29a5b6a
CH		 4080 ret = core_scsi3_pri_read_keys(cmd);
4081 break;
617c0e06 4082 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4083 ret = core_scsi3_pri_read_reservation(cmd);
4084 break;
617c0e06 4085 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4086 ret = core_scsi3_pri_report_capabilities(cmd);
4087 break;
617c0e06 4088 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4089 ret = core_scsi3_pri_read_full_status(cmd);
4090 break;
617c0e06
CH		 4091 default:
4092 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4093 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4094 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4095 }
4096
6bb35e00
CH		 4097 if (!ret)
4098 target_complete_cmd(cmd, GOOD);
d29a5b6a 4099 return ret;
c66ac9db
NB		 4100}
4101
de103c93
CH		 4102sense_reason_t
4103target_check_reservation(struct se_cmd *cmd)
c66ac9db 4104{
d977f437 4105 struct se_device *dev = cmd->se_dev;
de103c93 4106 sense_reason_t ret;
c66ac9db 4107
d977f437
CH		 4108 if (!cmd->se_sess)
4109 return 0;
4110 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4111 return 0;
a3541703 4112 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
d977f437 4113 return 0;
c66ac9db 4114
d977f437
CH		 4115 spin_lock(&dev->dev_reservation_lock);
4116 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4117 ret = target_scsi2_reservation_check(cmd);
4118 else
4119 ret = target_scsi3_pr_reservation_check(cmd);
4120 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4121
d977f437 4122 return ret;
c66ac9db 4123}
Linux kernel - Deliverables
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