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Merge tag 'ceph-for-4.9-rc2' of git://github.com/ceph/ceph-client
[linux-2.6-block.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>
5538d294 30#include <linux/vmalloc.h>
0e9b10a9 31#include <linux/file.h>
ba929992 32#include <scsi/scsi_proto.h>
c66ac9db
NB		 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;
50 struct se_dev_entry *dest_se_deve;
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;
f2d30680
HR		 232 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
233 " MAPPED LUN: %llu for %s\n",
234 tpg->se_tpg_tfo->get_fabric_name(),
29a05dee 235 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
c66ac9db 236 sess->se_node_acl->initiatorname);
c66ac9db 237
d29a5b6a
CH		 238out_unlock:
239 spin_unlock(&dev->dev_reservation_lock);
240out:
de103c93
CH		 241 target_complete_cmd(cmd, GOOD);
242 return 0;
c66ac9db
NB		 243}
244
de103c93
CH		 245sense_reason_t
246target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 247{
248 struct se_device *dev = cmd->se_dev;
249 struct se_session *sess = cmd->se_sess;
609234e3 250 struct se_portal_group *tpg;
de103c93
CH		 251 sense_reason_t ret = 0;
252 int rc;
c66ac9db 253
a1d8b49a
AG		 254 if ((cmd->t_task_cdb[1] & 0x01) &&
255 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 256 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 257 " ILLEGAL_REQUEST\n");
de103c93 258 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 259 }
260 /*
261 * This is currently the case for target_core_mod passthrough struct se_cmd
262 * ops
263 */
609234e3 264 if (!sess || !sess->se_tpg)
d29a5b6a 265 goto out;
087a03b3
NB		 266 rc = target_check_scsi2_reservation_conflict(cmd);
267 if (rc == 1)
d29a5b6a 268 goto out;
c66ac9db 269
de103c93
CH		 270 if (rc < 0)
271 return TCM_RESERVATION_CONFLICT;
272
609234e3 273 tpg = sess->se_tpg;
c66ac9db
NB		 274 spin_lock(&dev->dev_reservation_lock);
275 if (dev->dev_reserved_node_acl &&
276 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 277 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 278 tpg->se_tpg_tfo->get_fabric_name());
f2d30680 279 pr_err("Original reserver LUN: %llu %s\n",
e3d6f909 280 cmd->se_lun->unpacked_lun,
c66ac9db 281 dev->dev_reserved_node_acl->initiatorname);
f2d30680 282 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
e3d6f909 283 " from %s \n", cmd->se_lun->unpacked_lun,
29a05dee 284 cmd->orig_fe_lun,
c66ac9db 285 sess->se_node_acl->initiatorname);
de103c93 286 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 287 goto out_unlock;
c66ac9db
NB		 288 }
289
290 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 291 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 292 if (sess->sess_bin_isid != 0) {
293 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 295 }
f2d30680 296 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
e3d6f909 297 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
29a05dee 298 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
c66ac9db 299 sess->se_node_acl->initiatorname);
c66ac9db 300
d29a5b6a
CH		 301out_unlock:
302 spin_unlock(&dev->dev_reservation_lock);
303out:
6bb35e00
CH		 304 if (!ret)
305 target_complete_cmd(cmd, GOOD);
d29a5b6a 306 return ret;
c66ac9db
NB		 307}
308
c66ac9db
NB		 309
310/*
311 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
312 *
313 * This function is called by those initiator ports who are *NOT*
314 * the active PR reservation holder when a reservation is present.
315 */
9fcb57f3
CH		 316static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
317 bool isid_mismatch)
c66ac9db 318{
d977f437 319 unsigned char *cdb = cmd->t_task_cdb;
e3d6f909 320 struct se_session *se_sess = cmd->se_sess;
29a05dee 321 struct se_node_acl *nacl = se_sess->se_node_acl;
9fcb57f3 322 int other_cdb = 0;
c66ac9db
NB		 323 int registered_nexus = 0, ret = 1; /* Conflict by default */
324 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
325 int we = 0; /* Write Exclusive */
326 int legacy = 0; /* Act like a legacy device and return
327 * RESERVATION CONFLICT on some CDBs */
c66ac9db 328
9fcb57f3
CH		 329 if (isid_mismatch) {
330 registered_nexus = 0;
331 } else {
332 struct se_dev_entry *se_deve;
333
334 rcu_read_lock();
335 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
336 if (se_deve)
337 registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
338 &se_deve->deve_flags);
339 rcu_read_unlock();
340 }
c66ac9db
NB		 341
342 switch (pr_reg_type) {
343 case PR_TYPE_WRITE_EXCLUSIVE:
344 we = 1;
345 case PR_TYPE_EXCLUSIVE_ACCESS:
346 /*
347 * Some commands are only allowed for the persistent reservation
348 * holder.
349 */
c66ac9db
NB		 350 break;
351 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
352 we = 1;
353 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
354 /*
355 * Some commands are only allowed for registered I_T Nexuses.
356 */
357 reg_only = 1;
c66ac9db
NB		 358 break;
359 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
360 we = 1;
361 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
362 /*
363 * Each registered I_T Nexus is a reservation holder.
364 */
365 all_reg = 1;
c66ac9db
NB		 366 break;
367 default:
e3d6f909 368 return -EINVAL;
c66ac9db
NB		 369 }
370 /*
371 * Referenced from spc4r17 table 45 for *NON* PR holder access
372 */
373 switch (cdb[0]) {
374 case SECURITY_PROTOCOL_IN:
375 if (registered_nexus)
376 return 0;
377 ret = (we) ? 0 : 1;
378 break;
379 case MODE_SENSE:
380 case MODE_SENSE_10:
381 case READ_ATTRIBUTE:
382 case READ_BUFFER:
383 case RECEIVE_DIAGNOSTIC:
384 if (legacy) {
385 ret = 1;
386 break;
387 }
388 if (registered_nexus) {
389 ret = 0;
390 break;
391 }
392 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
393 break;
394 case PERSISTENT_RESERVE_OUT:
395 /*
396 * This follows PERSISTENT_RESERVE_OUT service actions that
397 * are allowed in the presence of various reservations.
398 * See spc4r17, table 46
399 */
400 switch (cdb[1] & 0x1f) {
401 case PRO_CLEAR:
402 case PRO_PREEMPT:
403 case PRO_PREEMPT_AND_ABORT:
404 ret = (registered_nexus) ? 0 : 1;
405 break;
406 case PRO_REGISTER:
407 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
408 ret = 0;
409 break;
410 case PRO_REGISTER_AND_MOVE:
411 case PRO_RESERVE:
412 ret = 1;
413 break;
414 case PRO_RELEASE:
415 ret = (registered_nexus) ? 0 : 1;
416 break;
417 default:
6708bb27 418 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 419 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 420 return -EINVAL;
c66ac9db
NB		 421 }
422 break;
423 case RELEASE:
424 case RELEASE_10:
eacac00c 425 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 426 ret = 0;
427 break;
428 case RESERVE:
429 case RESERVE_10:
eacac00c 430 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 431 ret = 0;
432 break;
433 case TEST_UNIT_READY:
434 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
435 break;
436 case MAINTENANCE_IN:
437 switch (cdb[1] & 0x1f) {
438 case MI_MANAGEMENT_PROTOCOL_IN:
439 if (registered_nexus) {
440 ret = 0;
441 break;
442 }
443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
444 break;
445 case MI_REPORT_SUPPORTED_OPERATION_CODES:
446 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
447 if (legacy) {
448 ret = 1;
449 break;
450 }
451 if (registered_nexus) {
452 ret = 0;
453 break;
454 }
455 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
456 break;
457 case MI_REPORT_ALIASES:
458 case MI_REPORT_IDENTIFYING_INFORMATION:
459 case MI_REPORT_PRIORITY:
460 case MI_REPORT_TARGET_PGS:
461 case MI_REPORT_TIMESTAMP:
462 ret = 0; /* Allowed */
463 break;
464 default:
6708bb27 465 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 466 (cdb[1] & 0x1f));
e3d6f909 467 return -EINVAL;
c66ac9db
NB		 468 }
469 break;
470 case ACCESS_CONTROL_IN:
471 case ACCESS_CONTROL_OUT:
472 case INQUIRY:
473 case LOG_SENSE:
85686f69 474 case SERVICE_ACTION_IN_12:
c66ac9db
NB		 475 case REPORT_LUNS:
476 case REQUEST_SENSE:
6816966a 477 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 478 ret = 0; /*/ Allowed CDBs */
479 break;
480 default:
481 other_cdb = 1;
482 break;
483 }
484 /*
25985edc 485 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 486 * statement.
487 */
6708bb27 488 if (!ret && !other_cdb) {
125d0119 489 pr_debug("Allowing explicit CDB: 0x%02x for %s"
c66ac9db
NB		 490 " reservation holder\n", cdb[0],
491 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 492
c66ac9db
NB		 493 return ret;
494 }
495 /*
496 * Check if write exclusive initiator ports *NOT* holding the
497 * WRITE_EXCLUSIVE_* reservation.
498 */
ee1b1b9c 499 if (we && !registered_nexus) {
c66ac9db
NB		 500 if (cmd->data_direction == DMA_TO_DEVICE) {
501 /*
502 * Conflict for write exclusive
503 */
6708bb27 504 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 505 " %s CDB: 0x%02x to %s reservation\n",
506 transport_dump_cmd_direction(cmd),
507 se_sess->se_node_acl->initiatorname, cdb[0],
508 core_scsi3_pr_dump_type(pr_reg_type));
509 return 1;
510 } else {
511 /*
512 * Allow non WRITE CDBs for all Write Exclusive
513 * PR TYPEs to pass for registered and
514 * non-registered_nexuxes NOT holding the reservation.
515 *
516 * We only make noise for the unregisterd nexuses,
517 * as we expect registered non-reservation holding
518 * nexuses to issue CDBs.
519 */
8b1e1244 520
6708bb27 521 if (!registered_nexus) {
125d0119 522 pr_debug("Allowing implicit CDB: 0x%02x"
c66ac9db
NB		 523 " for %s reservation on unregistered"
524 " nexus\n", cdb[0],
525 core_scsi3_pr_dump_type(pr_reg_type));
526 }
8b1e1244 527
c66ac9db
NB		 528 return 0;
529 }
530 } else if ((reg_only) || (all_reg)) {
531 if (registered_nexus) {
532 /*
533 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
534 * allow commands from registered nexuses.
535 */
8b1e1244 536
125d0119 537 pr_debug("Allowing implicit CDB: 0x%02x for %s"
c66ac9db
NB		 538 " reservation\n", cdb[0],
539 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 540
c66ac9db
NB		 541 return 0;
542 }
1ecc7586
LD		 543 } else if (we && registered_nexus) {
544 /*
545 * Reads are allowed for Write Exclusive locks
546 * from all registrants.
547 */
548 if (cmd->data_direction == DMA_FROM_DEVICE) {
549 pr_debug("Allowing READ CDB: 0x%02x for %s"
550 " reservation\n", cdb[0],
551 core_scsi3_pr_dump_type(pr_reg_type));
552
553 return 0;
554 }
c66ac9db 555 }
6708bb27 556 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 557 " for %s reservation\n", transport_dump_cmd_direction(cmd),
558 (registered_nexus) ? "" : "un",
559 se_sess->se_node_acl->initiatorname, cdb[0],
560 core_scsi3_pr_dump_type(pr_reg_type));
561
562 return 1; /* Conflict by default */
563}
564
de103c93
CH		 565static sense_reason_t
566target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 567{
568 struct se_device *dev = cmd->se_dev;
569 struct se_session *sess = cmd->se_sess;
570 u32 pr_reg_type;
9fcb57f3 571 bool isid_mismatch = false;
d977f437
CH		 572
573 if (!dev->dev_pr_res_holder)
574 return 0;
575
576 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
577 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
578 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
579 goto check_nonholder;
580
581 if (dev->dev_pr_res_holder->isid_present_at_reg) {
582 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
583 sess->sess_bin_isid) {
9fcb57f3 584 isid_mismatch = true;
d977f437
CH		 585 goto check_nonholder;
586 }
587 }
588
589 return 0;
590
591check_nonholder:
9fcb57f3 592 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
de103c93 593 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 594 return 0;
595}
596
c66ac9db
NB		 597static u32 core_scsi3_pr_generation(struct se_device *dev)
598{
c66ac9db 599 u32 prg;
0fd97ccf 600
c66ac9db
NB		 601 /*
602 * PRGeneration field shall contain the value of a 32-bit wrapping
603 * counter mainted by the device server.
604 *
605 * Note that this is done regardless of Active Persist across
606 * Target PowerLoss (APTPL)
607 *
608 * See spc4r17 section 6.3.12 READ_KEYS service action
609 */
610 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 611 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 612 spin_unlock(&dev->dev_reservation_lock);
613
614 return prg;
615}
616
c66ac9db
NB		 617static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
618 struct se_device *dev,
619 struct se_node_acl *nacl,
79dc9c9e 620 struct se_lun *lun,
3ccd6e83 621 struct se_dev_entry *dest_deve,
f2d30680 622 u64 mapped_lun,
c66ac9db
NB		 623 unsigned char *isid,
624 u64 sa_res_key,
625 int all_tg_pt,
626 int aptpl)
627{
c66ac9db
NB		 628 struct t10_pr_registration *pr_reg;
629
630 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 631 if (!pr_reg) {
632 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 633 return NULL;
634 }
635
c66ac9db
NB		 636 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
637 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
638 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
641 atomic_set(&pr_reg->pr_res_holders, 0);
642 pr_reg->pr_reg_nacl = nacl;
3ccd6e83
NB		 643 /*
644 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
645 * the se_dev_entry->pr_ref will have been already obtained by
646 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
647 *
648 * Otherwise, locate se_dev_entry now and obtain a reference until
649 * registration completes in __core_scsi3_add_registration().
650 */
651 if (dest_deve) {
652 pr_reg->pr_reg_deve = dest_deve;
653 } else {
654 rcu_read_lock();
655 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
656 if (!pr_reg->pr_reg_deve) {
657 rcu_read_unlock();
658 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
659 nacl->initiatorname, mapped_lun);
660 kmem_cache_free(t10_pr_reg_cache, pr_reg);
661 return NULL;
662 }
663 kref_get(&pr_reg->pr_reg_deve->pr_kref);
664 rcu_read_unlock();
665 }
79dc9c9e
NB		 666 pr_reg->pr_res_mapped_lun = mapped_lun;
667 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
adf653f9 668 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
c66ac9db
NB		 669 pr_reg->pr_res_key = sa_res_key;
670 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
671 pr_reg->pr_reg_aptpl = aptpl;
c66ac9db
NB		 672 /*
673 * If an ISID value for this SCSI Initiator Port exists,
674 * save it to the registration now.
675 */
676 if (isid != NULL) {
677 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
678 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
679 pr_reg->isid_present_at_reg = 1;
680 }
681
682 return pr_reg;
683}
684
685static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
686static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
687
688/*
689 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
690 * modes.
691 */
692static struct t10_pr_registration *__core_scsi3_alloc_registration(
693 struct se_device *dev,
694 struct se_node_acl *nacl,
79dc9c9e 695 struct se_lun *lun,
c66ac9db 696 struct se_dev_entry *deve,
f2d30680 697 u64 mapped_lun,
c66ac9db
NB		 698 unsigned char *isid,
699 u64 sa_res_key,
700 int all_tg_pt,
701 int aptpl)
702{
703 struct se_dev_entry *deve_tmp;
704 struct se_node_acl *nacl_tmp;
79dc9c9e 705 struct se_lun_acl *lacl_tmp;
adf653f9 706 struct se_lun *lun_tmp, *next, *dest_lun;
9ac8928e 707 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db
NB		 708 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
709 int ret;
710 /*
711 * Create a registration for the I_T Nexus upon which the
712 * PROUT REGISTER was received.
713 */
79dc9c9e
NB		 714 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
715 isid, sa_res_key, all_tg_pt,
716 aptpl);
6708bb27 717 if (!pr_reg)
c66ac9db
NB		 718 return NULL;
719 /*
720 * Return pointer to pr_reg for ALL_TG_PT=0
721 */
6708bb27 722 if (!all_tg_pt)
c66ac9db
NB		 723 return pr_reg;
724 /*
725 * Create list of matching SCSI Initiator Port registrations
726 * for ALL_TG_PT=1
727 */
728 spin_lock(&dev->se_port_lock);
adf653f9 729 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
9e37d042
NB		 730 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
731 continue;
c66ac9db
NB		 732 spin_unlock(&dev->se_port_lock);
733
1adff1b3 734 spin_lock(&lun_tmp->lun_deve_lock);
adf653f9 735 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
c66ac9db
NB		 736 /*
737 * This pointer will be NULL for demo mode MappedLUNs
125d0119 738 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 739 * MappedLUN group for the SCSI Initiator Node ACL.
740 */
6708bb27 741 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 742 continue;
743
79dc9c9e 744 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
adf653f9 745 lockdep_is_held(&lun_tmp->lun_deve_lock));
79dc9c9e 746 nacl_tmp = lacl_tmp->se_lun_nacl;
c66ac9db
NB		 747 /*
748 * Skip the matching struct se_node_acl that is allocated
749 * above..
750 */
751 if (nacl == nacl_tmp)
752 continue;
753 /*
754 * Only perform PR registrations for target ports on
755 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
756 * arrived.
757 */
758 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
759 continue;
760 /*
761 * Look for a matching Initiator Node ACL in ASCII format
762 */
763 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
764 continue;
765
29a05dee 766 kref_get(&deve_tmp->pr_kref);
1adff1b3 767 spin_unlock(&lun_tmp->lun_deve_lock);
c66ac9db
NB		 768 /*
769 * Grab a configfs group dependency that is released
770 * for the exception path at label out: below, or upon
771 * completion of adding ALL_TG_PT=1 registrations in
772 * __core_scsi3_add_registration()
773 */
774 ret = core_scsi3_lunacl_depend_item(deve_tmp);
775 if (ret < 0) {
6708bb27 776 pr_err("core_scsi3_lunacl_depend"
c66ac9db 777 "_item() failed\n");
9e37d042 778 percpu_ref_put(&lun_tmp->lun_ref);
29a05dee 779 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
c66ac9db
NB		 780 goto out;
781 }
782 /*
783 * Located a matching SCSI Initiator Port on a different
784 * port, allocate the pr_reg_atp and attach it to the
785 * pr_reg->pr_reg_atp_list that will be processed once
786 * the original *pr_reg is processed in
787 * __core_scsi3_add_registration()
788 */
adf653f9 789 dest_lun = rcu_dereference_check(deve_tmp->se_lun,
79dc9c9e
NB		 790 atomic_read(&deve_tmp->pr_kref.refcount) != 0);
791
c66ac9db 792 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
adf653f9 793 nacl_tmp, dest_lun, deve_tmp,
79dc9c9e 794 deve_tmp->mapped_lun, NULL,
c66ac9db 795 sa_res_key, all_tg_pt, aptpl);
6708bb27 796 if (!pr_reg_atp) {
9e37d042 797 percpu_ref_put(&lun_tmp->lun_ref);
c66ac9db
NB		 798 core_scsi3_lunacl_undepend_item(deve_tmp);
799 goto out;
800 }
801
802 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
803 &pr_reg->pr_reg_atp_list);
1adff1b3 804 spin_lock(&lun_tmp->lun_deve_lock);
c66ac9db 805 }
1adff1b3 806 spin_unlock(&lun_tmp->lun_deve_lock);
c66ac9db
NB		 807
808 spin_lock(&dev->se_port_lock);
9e37d042 809 percpu_ref_put(&lun_tmp->lun_ref);
c66ac9db
NB		 810 }
811 spin_unlock(&dev->se_port_lock);
812
813 return pr_reg;
814out:
815 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
816 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
817 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
818 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
819 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
820 }
821 kmem_cache_free(t10_pr_reg_cache, pr_reg);
822 return NULL;
823}
824
825int core_scsi3_alloc_aptpl_registration(
e3d6f909 826 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 827 u64 sa_res_key,
828 unsigned char *i_port,
829 unsigned char *isid,
f2d30680 830 u64 mapped_lun,
c66ac9db
NB		 831 unsigned char *t_port,
832 u16 tpgt,
f2d30680 833 u64 target_lun,
c66ac9db
NB		 834 int res_holder,
835 int all_tg_pt,
836 u8 type)
837{
838 struct t10_pr_registration *pr_reg;
839
6708bb27
AG		 840 if (!i_port || !t_port || !sa_res_key) {
841 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 842 return -EINVAL;
c66ac9db
NB		 843 }
844
845 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 846 if (!pr_reg) {
847 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 848 return -ENOMEM;
c66ac9db 849 }
c66ac9db
NB		 850
851 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
852 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
853 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
854 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
855 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
856 atomic_set(&pr_reg->pr_res_holders, 0);
857 pr_reg->pr_reg_nacl = NULL;
858 pr_reg->pr_reg_deve = NULL;
859 pr_reg->pr_res_mapped_lun = mapped_lun;
860 pr_reg->pr_aptpl_target_lun = target_lun;
861 pr_reg->pr_res_key = sa_res_key;
862 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
863 pr_reg->pr_reg_aptpl = 1;
c66ac9db
NB		 864 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
865 pr_reg->pr_res_type = type;
866 /*
867 * If an ISID value had been saved in APTPL metadata for this
868 * SCSI Initiator Port, restore it now.
869 */
870 if (isid != NULL) {
871 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
872 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
873 pr_reg->isid_present_at_reg = 1;
874 }
875 /*
876 * Copy the i_port and t_port information from caller.
877 */
878 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
879 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
880 pr_reg->pr_reg_tpgt = tpgt;
881 /*
882 * Set pr_res_holder from caller, the pr_reg who is the reservation
883 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
884 * the Initiator Node LUN ACL from the fabric module is created for
885 * this registration.
886 */
887 pr_reg->pr_res_holder = res_holder;
888
889 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 890 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 891 " metadata\n", (res_holder) ? "+reservation" : "");
892 return 0;
893}
894
895static void core_scsi3_aptpl_reserve(
896 struct se_device *dev,
897 struct se_portal_group *tpg,
898 struct se_node_acl *node_acl,
899 struct t10_pr_registration *pr_reg)
900{
901 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 902
903 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 904 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 905
906 spin_lock(&dev->dev_reservation_lock);
907 dev->dev_pr_res_holder = pr_reg;
908 spin_unlock(&dev->dev_reservation_lock);
909
6708bb27 910 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 911 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 912 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 913 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
914 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 915 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 916 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 917 i_buf);
c66ac9db
NB		 918}
919
920static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 921 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 922
923static int __core_scsi3_check_aptpl_registration(
924 struct se_device *dev,
925 struct se_portal_group *tpg,
926 struct se_lun *lun,
f2d30680 927 u64 target_lun,
c66ac9db 928 struct se_node_acl *nacl,
f2d30680 929 u64 mapped_lun)
c66ac9db
NB		 930{
931 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 932 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 933 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
934 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
935 u16 tpgt;
936
937 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
938 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
939 /*
940 * Copy Initiator Port information from struct se_node_acl
941 */
942 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
943 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 944 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
945 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 946 /*
947 * Look for the matching registrations+reservation from those
948 * created from APTPL metadata. Note that multiple registrations
949 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
950 * TransportIDs.
951 */
952 spin_lock(&pr_tmpl->aptpl_reg_lock);
953 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
954 pr_reg_aptpl_list) {
92404e60 955
6708bb27 956 if (!strcmp(pr_reg->pr_iport, i_port) &&
29a05dee 957 (pr_reg->pr_res_mapped_lun == mapped_lun) &&
c66ac9db
NB		 958 !(strcmp(pr_reg->pr_tport, t_port)) &&
959 (pr_reg->pr_reg_tpgt == tpgt) &&
960 (pr_reg->pr_aptpl_target_lun == target_lun)) {
3ccd6e83
NB		 961 /*
962 * Obtain the ->pr_reg_deve pointer + reference, that
963 * is released by __core_scsi3_add_registration() below.
964 */
965 rcu_read_lock();
966 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
967 if (!pr_reg->pr_reg_deve) {
968 pr_err("Unable to locate PR APTPL %s mapped_lun:"
969 " %llu\n", nacl->initiatorname, mapped_lun);
970 rcu_read_unlock();
971 continue;
972 }
973 kref_get(&pr_reg->pr_reg_deve->pr_kref);
974 rcu_read_unlock();
c66ac9db
NB		 975
976 pr_reg->pr_reg_nacl = nacl;
adf653f9 977 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
c66ac9db
NB		 978 list_del(&pr_reg->pr_reg_aptpl_list);
979 spin_unlock(&pr_tmpl->aptpl_reg_lock);
980 /*
981 * At this point all of the pointers in *pr_reg will
982 * be setup, so go ahead and add the registration.
983 */
c66ac9db
NB		 984 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
985 /*
986 * If this registration is the reservation holder,
987 * make that happen now..
988 */
989 if (pr_reg->pr_res_holder)
990 core_scsi3_aptpl_reserve(dev, tpg,
991 nacl, pr_reg);
992 /*
993 * Reenable pr_aptpl_active to accept new metadata
994 * updates once the SCSI device is active again..
995 */
996 spin_lock(&pr_tmpl->aptpl_reg_lock);
997 pr_tmpl->pr_aptpl_active = 1;
998 }
999 }
1000 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1001
1002 return 0;
1003}
1004
1005int core_scsi3_check_aptpl_registration(
1006 struct se_device *dev,
1007 struct se_portal_group *tpg,
1008 struct se_lun *lun,
e2480563 1009 struct se_node_acl *nacl,
f2d30680 1010 u64 mapped_lun)
c66ac9db 1011{
d977f437 1012 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 1013 return 0;
1014
1015 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
29a05dee
NB		 1016 lun->unpacked_lun, nacl,
1017 mapped_lun);
c66ac9db
NB		 1018}
1019
1020static void __core_scsi3_dump_registration(
9ac8928e 1021 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1022 struct se_device *dev,
1023 struct se_node_acl *nacl,
1024 struct t10_pr_registration *pr_reg,
33ce6a87 1025 enum register_type register_type)
c66ac9db
NB		 1026{
1027 struct se_portal_group *se_tpg = nacl->se_tpg;
1028 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1029
1030 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 1031 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1032
6708bb27 1033 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 1034 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1035 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 1036 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 1037 i_buf);
6708bb27 1038 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 1039 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1040 tfo->tpg_get_tag(se_tpg));
6708bb27 1041 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1042 " Port(s)\n", tfo->get_fabric_name(),
1043 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1044 dev->transport->name);
6708bb27 1045 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1046 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1047 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1048 pr_reg->pr_reg_aptpl);
1049}
1050
c66ac9db
NB		 1051static void __core_scsi3_add_registration(
1052 struct se_device *dev,
1053 struct se_node_acl *nacl,
1054 struct t10_pr_registration *pr_reg,
33ce6a87 1055 enum register_type register_type,
c66ac9db
NB		 1056 int register_move)
1057{
9ac8928e 1058 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 1059 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1060 struct t10_reservation *pr_tmpl = &dev->t10_pr;
80bfdfa9 1061 struct se_dev_entry *deve;
c66ac9db
NB		 1062
1063 /*
1064 * Increment PRgeneration counter for struct se_device upon a successful
1065 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1066 *
1067 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1068 * action, the struct se_device->dev_reservation_lock will already be held,
1069 * so we do not call core_scsi3_pr_generation() which grabs the lock
1070 * for the REGISTER.
1071 */
1072 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1073 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1074 core_scsi3_pr_generation(dev);
1075
1076 spin_lock(&pr_tmpl->registration_lock);
1077 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
c66ac9db
NB		 1078
1079 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1080 spin_unlock(&pr_tmpl->registration_lock);
1081 /*
1082 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1083 */
6708bb27 1084 if (!pr_reg->pr_reg_all_tg_pt || register_move)
3ccd6e83 1085 goto out;
c66ac9db
NB		 1086 /*
1087 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1088 * allocated in __core_scsi3_alloc_registration()
1089 */
1090 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1091 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
80bfdfa9
NB		 1092 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1093
c66ac9db
NB		 1094 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1095
1096 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1097
1098 spin_lock(&pr_tmpl->registration_lock);
1099 list_add_tail(&pr_reg_tmp->pr_reg_list,
1100 &pr_tmpl->registration_list);
c66ac9db 1101
80bfdfa9
NB		 1102 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1103 register_type);
c66ac9db 1104 spin_unlock(&pr_tmpl->registration_lock);
3ccd6e83
NB		 1105 /*
1106 * Drop configfs group dependency reference and deve->pr_kref
1107 * obtained from __core_scsi3_alloc_registration() code.
1108 */
80bfdfa9
NB		 1109 rcu_read_lock();
1110 deve = pr_reg_tmp->pr_reg_deve;
3ccd6e83 1111 if (deve) {
80bfdfa9 1112 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
3ccd6e83
NB		 1113 core_scsi3_lunacl_undepend_item(deve);
1114 pr_reg_tmp->pr_reg_deve = NULL;
1115 }
80bfdfa9 1116 rcu_read_unlock();
c66ac9db 1117 }
3ccd6e83
NB		 1118out:
1119 /*
1120 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1121 */
1122 rcu_read_lock();
1123 deve = pr_reg->pr_reg_deve;
1124 if (deve) {
1125 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1126 kref_put(&deve->pr_kref, target_pr_kref_release);
1127 pr_reg->pr_reg_deve = NULL;
1128 }
1129 rcu_read_unlock();
c66ac9db
NB		 1130}
1131
1132static int core_scsi3_alloc_registration(
1133 struct se_device *dev,
1134 struct se_node_acl *nacl,
79dc9c9e 1135 struct se_lun *lun,
c66ac9db 1136 struct se_dev_entry *deve,
f2d30680 1137 u64 mapped_lun,
c66ac9db
NB		 1138 unsigned char *isid,
1139 u64 sa_res_key,
1140 int all_tg_pt,
1141 int aptpl,
33ce6a87 1142 enum register_type register_type,
c66ac9db
NB		 1143 int register_move)
1144{
1145 struct t10_pr_registration *pr_reg;
1146
79dc9c9e
NB		 1147 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1148 isid, sa_res_key, all_tg_pt,
1149 aptpl);
6708bb27 1150 if (!pr_reg)
e3d6f909 1151 return -EPERM;
c66ac9db
NB		 1152
1153 __core_scsi3_add_registration(dev, nacl, pr_reg,
1154 register_type, register_move);
1155 return 0;
1156}
1157
1158static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1159 struct se_device *dev,
1160 struct se_node_acl *nacl,
1161 unsigned char *isid)
1162{
0fd97ccf 1163 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1164 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1165 struct se_portal_group *tpg;
1166
1167 spin_lock(&pr_tmpl->registration_lock);
1168 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1169 &pr_tmpl->registration_list, pr_reg_list) {
1170 /*
1171 * First look for a matching struct se_node_acl
1172 */
1173 if (pr_reg->pr_reg_nacl != nacl)
1174 continue;
1175
1176 tpg = pr_reg->pr_reg_nacl->se_tpg;
1177 /*
1178 * If this registration does NOT contain a fabric provided
1179 * ISID, then we have found a match.
1180 */
6708bb27 1181 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1182 /*
1183 * Determine if this SCSI device server requires that
1184 * SCSI Intiatior TransportID w/ ISIDs is enforced
1185 * for fabric modules (iSCSI) requiring them.
1186 */
e3d6f909 1187 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1188 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1189 continue;
1190 }
33940d09 1191 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1192 spin_unlock(&pr_tmpl->registration_lock);
1193 return pr_reg;
1194 }
1195 /*
1196 * If the *pr_reg contains a fabric defined ISID for multi-value
1197 * SCSI Initiator Port TransportIDs, then we expect a valid
1198 * matching ISID to be provided by the local SCSI Initiator Port.
1199 */
6708bb27 1200 if (!isid)
c66ac9db
NB		 1201 continue;
1202 if (strcmp(isid, pr_reg->pr_reg_isid))
1203 continue;
1204
33940d09 1205 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1206 spin_unlock(&pr_tmpl->registration_lock);
1207 return pr_reg;
1208 }
1209 spin_unlock(&pr_tmpl->registration_lock);
1210
1211 return NULL;
1212}
1213
1214static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1215 struct se_device *dev,
1216 struct se_node_acl *nacl,
1217 struct se_session *sess)
1218{
1219 struct se_portal_group *tpg = nacl->se_tpg;
1220 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1221
e3d6f909 1222 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1223 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1224 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1225 PR_REG_ISID_LEN);
1226 isid_ptr = &buf[0];
1227 }
1228
1229 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1230}
1231
1232static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1233{
33940d09 1234 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1235}
1236
125d0119 1237static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1238 struct se_device *dev,
1239 struct t10_pr_registration *pr_reg)
1240{
1241 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1242 struct t10_pr_registration *pr_res_holder;
1243 int ret = 0;
1244
1245 spin_lock(&dev->dev_reservation_lock);
1246 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1247 if (!pr_res_holder) {
c66ac9db
NB		 1248 spin_unlock(&dev->dev_reservation_lock);
1249 return ret;
1250 }
1251 if (pr_res_holder == pr_reg) {
1252 /*
125d0119 1253 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1254 * is being released is holding the reservation.
1255 *
1256 * From spc4r17, section 5.7.11.1:
1257 *
1258 * e) If the I_T nexus is the persistent reservation holder
1259 * and the persistent reservation is not an all registrants
1260 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1261 * service action or REGISTER AND IGNORE EXISTING KEY
1262 * service action with the SERVICE ACTION RESERVATION KEY
1263 * field set to zero (see 5.7.11.3).
1264 */
6c3c9baa 1265 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
c66ac9db
NB		 1266 ret = 1;
1267 /*
1268 * For 'All Registrants' reservation types, all existing
1269 * registrations are still processed as reservation holders
1270 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1271 * reservation holder is implicitly released here.
c66ac9db
NB		 1272 */
1273 } else if (pr_reg->pr_reg_all_tg_pt &&
1274 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1275 pr_reg->pr_reg_nacl->initiatorname)) &&
1276 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1277 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1278 " UNREGISTER while existing reservation with matching"
1279 " key 0x%016Lx is present from another SCSI Initiator"
1280 " Port\n", pr_reg->pr_res_key);
e3d6f909 1281 ret = -EPERM;
c66ac9db
NB		 1282 }
1283 spin_unlock(&dev->dev_reservation_lock);
1284
1285 return ret;
1286}
1287
1288/*
e3d6f909 1289 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1290 */
1291static void __core_scsi3_free_registration(
1292 struct se_device *dev,
1293 struct t10_pr_registration *pr_reg,
1294 struct list_head *preempt_and_abort_list,
1295 int dec_holders)
cb0df4d3
BVA		 1296 __releases(&pr_tmpl->registration_lock)
1297 __acquires(&pr_tmpl->registration_lock)
c66ac9db 1298{
9ac8928e 1299 const struct target_core_fabric_ops *tfo =
c66ac9db 1300 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1301 struct t10_reservation *pr_tmpl = &dev->t10_pr;
80bfdfa9
NB		 1302 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1303 struct se_dev_entry *deve;
c66ac9db 1304 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1305
1306 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1307 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1308
6c3c9baa
NB		 1309 if (!list_empty(&pr_reg->pr_reg_list))
1310 list_del(&pr_reg->pr_reg_list);
c66ac9db
NB		 1311 /*
1312 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1313 * so call core_scsi3_put_pr_reg() to decrement our reference.
1314 */
1315 if (dec_holders)
1316 core_scsi3_put_pr_reg(pr_reg);
80bfdfa9
NB		 1317
1318 spin_unlock(&pr_tmpl->registration_lock);
c66ac9db
NB		 1319 /*
1320 * Wait until all reference from any other I_T nexuses for this
1321 * *pr_reg have been released. Because list_del() is called above,
1322 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1323 * count back to zero, and we release *pr_reg.
1324 */
1325 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
6708bb27 1326 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1327 tfo->get_fabric_name());
1328 cpu_relax();
c66ac9db
NB		 1329 }
1330
80bfdfa9
NB		 1331 rcu_read_lock();
1332 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1333 if (deve)
1334 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1335 rcu_read_unlock();
1336
1337 spin_lock(&pr_tmpl->registration_lock);
6708bb27 1338 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1339 " Node: %s%s\n", tfo->get_fabric_name(),
1340 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1341 i_buf);
6708bb27 1342 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1343 " Port(s)\n", tfo->get_fabric_name(),
1344 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1345 dev->transport->name);
6708bb27 1346 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1347 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1348 pr_reg->pr_res_generation);
1349
6708bb27 1350 if (!preempt_and_abort_list) {
c66ac9db
NB		 1351 pr_reg->pr_reg_deve = NULL;
1352 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1353 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1354 return;
1355 }
1356 /*
1357 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1358 * are released once the ABORT_TASK_SET has completed..
1359 */
1360 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1361}
1362
1363void core_scsi3_free_pr_reg_from_nacl(
1364 struct se_device *dev,
1365 struct se_node_acl *nacl)
1366{
0fd97ccf 1367 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1368 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
6c3c9baa 1369 bool free_reg = false;
c66ac9db
NB		 1370 /*
1371 * If the passed se_node_acl matches the reservation holder,
1372 * release the reservation.
1373 */
1374 spin_lock(&dev->dev_reservation_lock);
1375 pr_res_holder = dev->dev_pr_res_holder;
1376 if ((pr_res_holder != NULL) &&
6c3c9baa
NB		 1377 (pr_res_holder->pr_reg_nacl == nacl)) {
1378 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1379 free_reg = true;
1380 }
c66ac9db
NB		 1381 spin_unlock(&dev->dev_reservation_lock);
1382 /*
1383 * Release any registration associated with the struct se_node_acl.
1384 */
1385 spin_lock(&pr_tmpl->registration_lock);
6c3c9baa
NB		 1386 if (pr_res_holder && free_reg)
1387 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1388
c66ac9db
NB		 1389 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1390 &pr_tmpl->registration_list, pr_reg_list) {
1391
1392 if (pr_reg->pr_reg_nacl != nacl)
1393 continue;
1394
1395 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1396 }
1397 spin_unlock(&pr_tmpl->registration_lock);
1398}
1399
1400void core_scsi3_free_all_registrations(
1401 struct se_device *dev)
1402{
0fd97ccf 1403 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1404 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1405
1406 spin_lock(&dev->dev_reservation_lock);
1407 pr_res_holder = dev->dev_pr_res_holder;
1408 if (pr_res_holder != NULL) {
1409 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1410 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 1411 pr_res_holder, 0, 0);
c66ac9db
NB		 1412 }
1413 spin_unlock(&dev->dev_reservation_lock);
1414
1415 spin_lock(&pr_tmpl->registration_lock);
1416 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1417 &pr_tmpl->registration_list, pr_reg_list) {
1418
1419 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1420 }
1421 spin_unlock(&pr_tmpl->registration_lock);
1422
1423 spin_lock(&pr_tmpl->aptpl_reg_lock);
1424 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1425 pr_reg_aptpl_list) {
1426 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1427 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1428 }
1429 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1430}
1431
1432static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1433{
d588cf8f 1434 return target_depend_item(&tpg->tpg_group.cg_item);
c66ac9db
NB		 1435}
1436
1437static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1438{
d588cf8f 1439 target_undepend_item(&tpg->tpg_group.cg_item);
33940d09 1440 atomic_dec_mb(&tpg->tpg_pr_ref_count);
c66ac9db
NB		 1441}
1442
1443static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1444{
c66ac9db
NB		 1445 if (nacl->dynamic_node_acl)
1446 return 0;
d588cf8f 1447 return target_depend_item(&nacl->acl_group.cg_item);
c66ac9db
NB		 1448}
1449
1450static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1451{
d588cf8f
CH		 1452 if (!nacl->dynamic_node_acl)
1453 target_undepend_item(&nacl->acl_group.cg_item);
33940d09 1454 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1455}
1456
1457static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1458{
79dc9c9e 1459 struct se_lun_acl *lun_acl;
ac75d8be 1460
c66ac9db
NB		 1461 /*
1462 * For nacl->dynamic_node_acl=1
1463 */
79dc9c9e
NB		 1464 lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1465 atomic_read(&se_deve->pr_kref.refcount) != 0);
6708bb27 1466 if (!lun_acl)
c66ac9db
NB		 1467 return 0;
1468
d588cf8f 1469 return target_depend_item(&lun_acl->se_lun_group.cg_item);
c66ac9db
NB		 1470}
1471
1472static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1473{
29a05dee 1474 struct se_lun_acl *lun_acl;
ac75d8be 1475
c66ac9db
NB		 1476 /*
1477 * For nacl->dynamic_node_acl=1
1478 */
79dc9c9e
NB		 1479 lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1480 atomic_read(&se_deve->pr_kref.refcount) != 0);
6708bb27 1481 if (!lun_acl) {
29a05dee 1482 kref_put(&se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1483 return;
1484 }
c66ac9db 1485
d588cf8f 1486 target_undepend_item(&lun_acl->se_lun_group.cg_item);
29a05dee 1487 kref_put(&se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1488}
1489
de103c93
CH		 1490static sense_reason_t
1491core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1492 struct se_cmd *cmd,
1493 struct se_portal_group *tpg,
1494 unsigned char *l_isid,
1495 u64 sa_res_key,
1496 int all_tg_pt,
1497 int aptpl)
1498{
5951146d 1499 struct se_device *dev = cmd->se_dev;
c66ac9db 1500 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1501 struct se_session *se_sess = cmd->se_sess;
c66ac9db 1502 struct se_node_acl *dest_node_acl = NULL;
79dc9c9e 1503 struct se_dev_entry *dest_se_deve = NULL;
c66ac9db
NB		 1504 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1505 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1506 LIST_HEAD(tid_dest_list);
c66ac9db 1507 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
2650d71e 1508 unsigned char *buf, *ptr, proto_ident;
9b353cc8 1509 const unsigned char *i_str = NULL;
13ba564c 1510 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
de103c93 1511 sense_reason_t ret;
c66ac9db 1512 u32 tpdl, tid_len = 0;
c66ac9db
NB		 1513 u32 dest_rtpi = 0;
1514
c66ac9db
NB		 1515 /*
1516 * Allocate a struct pr_transport_id_holder and setup the
79dc9c9e
NB		 1517 * local_node_acl pointer and add to struct list_head tid_dest_list
1518 * for add registration processing in the loop of tid_dest_list below.
c66ac9db
NB		 1519 */
1520 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1521 if (!tidh_new) {
1522 pr_err("Unable to allocate tidh_new\n");
de103c93 1523 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1524 }
1525 INIT_LIST_HEAD(&tidh_new->dest_list);
1526 tidh_new->dest_tpg = tpg;
1527 tidh_new->dest_node_acl = se_sess->se_node_acl;
c66ac9db 1528
5951146d 1529 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 1530 se_sess->se_node_acl, cmd->se_lun,
1531 NULL, cmd->orig_fe_lun, l_isid,
c66ac9db 1532 sa_res_key, all_tg_pt, aptpl);
6708bb27 1533 if (!local_pr_reg) {
c66ac9db 1534 kfree(tidh_new);
de103c93 1535 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1536 }
1537 tidh_new->dest_pr_reg = local_pr_reg;
1538 /*
1539 * The local I_T nexus does not hold any configfs dependances,
79dc9c9e 1540 * so we set tidh_new->dest_se_deve to NULL to prevent the
c66ac9db
NB		 1541 * configfs_undepend_item() calls in the tid_dest_list loops below.
1542 */
79dc9c9e 1543 tidh_new->dest_se_deve = NULL;
c66ac9db 1544 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1545
0d7f1299
PB		 1546 if (cmd->data_length < 28) {
1547 pr_warn("SPC-PR: Received PR OUT parameter list"
1548 " length too small: %u\n", cmd->data_length);
de103c93 1549 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1550 goto out;
1551 }
1552
4949314c 1553 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1554 if (!buf) {
1555 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1556 goto out;
1557 }
1558
c66ac9db
NB		 1559 /*
1560 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1561 * first extract TransportID Parameter Data Length, and make sure
1562 * the value matches up to the SCSI expected data transfer length.
1563 */
1564 tpdl = (buf[24] & 0xff) << 24;
1565 tpdl |= (buf[25] & 0xff) << 16;
1566 tpdl |= (buf[26] & 0xff) << 8;
1567 tpdl |= buf[27] & 0xff;
1568
1569 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1570 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1571 " does not equal CDB data_length: %u\n", tpdl,
1572 cmd->data_length);
de103c93
CH		 1573 ret = TCM_INVALID_PARAMETER_LIST;
1574 goto out_unmap;
c66ac9db
NB		 1575 }
1576 /*
1577 * Start processing the received transport IDs using the
1578 * receiving I_T Nexus portal's fabric dependent methods to
1579 * obtain the SCSI Initiator Port/Device Identifiers.
1580 */
1581 ptr = &buf[28];
1582
1583 while (tpdl > 0) {
adf653f9 1584 struct se_lun *dest_lun, *tmp_lun;
79dc9c9e 1585
c66ac9db
NB		 1586 proto_ident = (ptr[0] & 0x0f);
1587 dest_tpg = NULL;
1588
1589 spin_lock(&dev->se_port_lock);
adf653f9
CH		 1590 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1591 tmp_tpg = tmp_lun->lun_tpg;
2650d71e 1592
c66ac9db
NB		 1593 /*
1594 * Look for the matching proto_ident provided by
1595 * the received TransportID
1596 */
2aeeafae 1597 if (tmp_tpg->proto_id != proto_ident)
c66ac9db 1598 continue;
adf653f9 1599 dest_rtpi = tmp_lun->lun_rtpi;
c66ac9db 1600
2650d71e
CH		 1601 i_str = target_parse_pr_out_transport_id(tmp_tpg,
1602 (const char *)ptr, &tid_len, &iport_ptr);
6708bb27 1603 if (!i_str)
c66ac9db
NB		 1604 continue;
1605
33940d09 1606 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
c66ac9db
NB		 1607 spin_unlock(&dev->se_port_lock);
1608
de103c93 1609 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1610 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db 1611 " for tmp_tpg\n");
33940d09 1612 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
de103c93
CH		 1613 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1614 goto out_unmap;
c66ac9db
NB		 1615 }
1616 /*
35d1efe8 1617 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1618 * from the decoded fabric module specific TransportID
1619 * at *i_str.
1620 */
403edd78 1621 mutex_lock(&tmp_tpg->acl_node_mutex);
c66ac9db
NB		 1622 dest_node_acl = __core_tpg_get_initiator_node_acl(
1623 tmp_tpg, i_str);
33940d09
JE		 1624 if (dest_node_acl)
1625 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
403edd78 1626 mutex_unlock(&tmp_tpg->acl_node_mutex);
c66ac9db 1627
6708bb27 1628 if (!dest_node_acl) {
c66ac9db
NB		 1629 core_scsi3_tpg_undepend_item(tmp_tpg);
1630 spin_lock(&dev->se_port_lock);
1631 continue;
1632 }
1633
de103c93 1634 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1635 pr_err("configfs_depend_item() failed"
c66ac9db 1636 " for dest_node_acl->acl_group\n");
33940d09 1637 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 1638 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1639 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1640 goto out_unmap;
c66ac9db
NB		 1641 }
1642
1643 dest_tpg = tmp_tpg;
6708bb27 1644 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1645 " %s Port RTPI: %hu\n",
e3d6f909 1646 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1647 dest_node_acl->initiatorname, dest_rtpi);
1648
1649 spin_lock(&dev->se_port_lock);
1650 break;
1651 }
1652 spin_unlock(&dev->se_port_lock);
1653
6708bb27
AG		 1654 if (!dest_tpg) {
1655 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1656 " dest_tpg\n");
de103c93
CH		 1657 ret = TCM_INVALID_PARAMETER_LIST;
1658 goto out_unmap;
c66ac9db 1659 }
8b1e1244 1660
6708bb27 1661 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1662 " tid_len: %d for %s + %s\n",
e3d6f909 1663 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1664 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1665
c66ac9db 1666 if (tid_len > tpdl) {
6708bb27 1667 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1668 " %u for Transport ID: %s\n", tid_len, ptr);
1669 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1670 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1671 ret = TCM_INVALID_PARAMETER_LIST;
1672 goto out_unmap;
c66ac9db
NB		 1673 }
1674 /*
1675 * Locate the desintation struct se_dev_entry pointer for matching
1676 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1677 * Target Port.
1678 */
1679 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1680 dest_rtpi);
6708bb27
AG		 1681 if (!dest_se_deve) {
1682 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1683 " from destination RTPI: %hu\n",
e3d6f909 1684 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1685 dest_rtpi);
1686
1687 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1688 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1689 ret = TCM_INVALID_PARAMETER_LIST;
1690 goto out_unmap;
c66ac9db
NB		 1691 }
1692
de103c93 1693 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1694 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db 1695 " failed\n");
29a05dee 1696 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
c66ac9db
NB		 1697 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1698 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1699 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1700 goto out_unmap;
c66ac9db 1701 }
8b1e1244 1702
6708bb27 1703 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
f2d30680 1704 " dest_se_deve mapped_lun: %llu\n",
e3d6f909 1705 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1706 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1707
c66ac9db
NB		 1708 /*
1709 * Skip any TransportIDs that already have a registration for
1710 * this target port.
1711 */
1712 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1713 iport_ptr);
1714 if (pr_reg_e) {
1715 core_scsi3_put_pr_reg(pr_reg_e);
1716 core_scsi3_lunacl_undepend_item(dest_se_deve);
1717 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1718 core_scsi3_tpg_undepend_item(dest_tpg);
1719 ptr += tid_len;
1720 tpdl -= tid_len;
1721 tid_len = 0;
1722 continue;
1723 }
1724 /*
1725 * Allocate a struct pr_transport_id_holder and setup
1726 * the dest_node_acl and dest_se_deve pointers for the
1727 * loop below.
1728 */
1729 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1730 GFP_KERNEL);
6708bb27
AG		 1731 if (!tidh_new) {
1732 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1733 core_scsi3_lunacl_undepend_item(dest_se_deve);
1734 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1735 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1736 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1737 goto out_unmap;
c66ac9db
NB		 1738 }
1739 INIT_LIST_HEAD(&tidh_new->dest_list);
1740 tidh_new->dest_tpg = dest_tpg;
1741 tidh_new->dest_node_acl = dest_node_acl;
1742 tidh_new->dest_se_deve = dest_se_deve;
1743
1744 /*
1745 * Allocate, but do NOT add the registration for the
1746 * TransportID referenced SCSI Initiator port. This
1747 * done because of the following from spc4r17 in section
1748 * 6.14.3 wrt SPEC_I_PT:
1749 *
1750 * "If a registration fails for any initiator port (e.g., if th
1751 * logical unit does not have enough resources available to
1752 * hold the registration information), no registrations shall be
1753 * made, and the command shall be terminated with
1754 * CHECK CONDITION status."
1755 *
1756 * That means we call __core_scsi3_alloc_registration() here,
1757 * and then call __core_scsi3_add_registration() in the
1758 * 2nd loop which will never fail.
1759 */
79dc9c9e
NB		 1760 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1761 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
1762
5951146d 1763 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 1764 dest_node_acl, dest_lun, dest_se_deve,
1765 dest_se_deve->mapped_lun, iport_ptr,
1766 sa_res_key, all_tg_pt, aptpl);
6708bb27 1767 if (!dest_pr_reg) {
c66ac9db
NB		 1768 core_scsi3_lunacl_undepend_item(dest_se_deve);
1769 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1770 core_scsi3_tpg_undepend_item(dest_tpg);
1771 kfree(tidh_new);
de103c93
CH		 1772 ret = TCM_INVALID_PARAMETER_LIST;
1773 goto out_unmap;
c66ac9db
NB		 1774 }
1775 tidh_new->dest_pr_reg = dest_pr_reg;
1776 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1777
1778 ptr += tid_len;
1779 tpdl -= tid_len;
1780 tid_len = 0;
1781
1782 }
05d1c7c0 1783
4949314c 1784 transport_kunmap_data_sg(cmd);
05d1c7c0 1785
c66ac9db
NB		 1786 /*
1787 * Go ahead and create a registrations from tid_dest_list for the
1788 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1789 * and dest_se_deve.
1790 *
1791 * The SA Reservation Key from the PROUT is set for the
1792 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1793 * means that the TransportID Initiator port will be
1794 * registered on all of the target ports in the SCSI target device
1795 * ALL_TG_PT=0 means the registration will only be for the
1796 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1797 * was received.
1798 */
1799 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1800 dest_tpg = tidh->dest_tpg;
1801 dest_node_acl = tidh->dest_node_acl;
1802 dest_se_deve = tidh->dest_se_deve;
1803 dest_pr_reg = tidh->dest_pr_reg;
c66ac9db
NB		 1804
1805 list_del(&tidh->dest_list);
1806 kfree(tidh);
1807
1808 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1809 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1810
5951146d 1811 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1812 dest_pr_reg, 0, 0);
1813
6708bb27 1814 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1815 " registered Transport ID for Node: %s%s Mapped LUN:"
f2d30680 1816 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
79dc9c9e
NB		 1817 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1818 dest_se_deve->mapped_lun : 0);
c66ac9db 1819
3ccd6e83
NB		 1820 if (!dest_se_deve) {
1821 kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1822 target_pr_kref_release);
c66ac9db 1823 continue;
3ccd6e83 1824 }
c66ac9db
NB		 1825 core_scsi3_lunacl_undepend_item(dest_se_deve);
1826 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1827 core_scsi3_tpg_undepend_item(dest_tpg);
1828 }
1829
1830 return 0;
de103c93 1831out_unmap:
4949314c 1832 transport_kunmap_data_sg(cmd);
de103c93 1833out:
c66ac9db
NB		 1834 /*
1835 * For the failure case, release everything from tid_dest_list
1836 * including *dest_pr_reg and the configfs dependances..
1837 */
1838 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1839 dest_tpg = tidh->dest_tpg;
1840 dest_node_acl = tidh->dest_node_acl;
1841 dest_se_deve = tidh->dest_se_deve;
1842 dest_pr_reg = tidh->dest_pr_reg;
c66ac9db
NB		 1843
1844 list_del(&tidh->dest_list);
1845 kfree(tidh);
1846 /*
1847 * Release any extra ALL_TG_PT=1 registrations for
1848 * the SPEC_I_PT=1 case.
1849 */
1850 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1851 &dest_pr_reg->pr_reg_atp_list,
1852 pr_reg_atp_mem_list) {
1853 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1854 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1855 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1856 }
1857
c66ac9db
NB		 1858 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1859
3ccd6e83
NB		 1860 if (!dest_se_deve) {
1861 kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1862 target_pr_kref_release);
c66ac9db 1863 continue;
3ccd6e83 1864 }
c66ac9db
NB		 1865 core_scsi3_lunacl_undepend_item(dest_se_deve);
1866 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1867 core_scsi3_tpg_undepend_item(dest_tpg);
1868 }
1869 return ret;
1870}
1871
3c8a6228 1872static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1873 struct se_device *dev,
1874 unsigned char *buf,
0607decd 1875 u32 pr_aptpl_buf_len)
c66ac9db 1876{
c66ac9db 1877 struct se_portal_group *tpg;
c66ac9db
NB		 1878 struct t10_pr_registration *pr_reg;
1879 unsigned char tmp[512], isid_buf[32];
1880 ssize_t len = 0;
1881 int reg_count = 0;
3c8a6228 1882 int ret = 0;
c66ac9db 1883
3c8a6228
AG		 1884 spin_lock(&dev->dev_reservation_lock);
1885 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1886 /*
1887 * Walk the registration list..
1888 */
0fd97ccf 1889 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1890 pr_reg_list) {
1891
1892 tmp[0] = '\0';
1893 isid_buf[0] = '\0';
1894 tpg = pr_reg->pr_reg_nacl->se_tpg;
c66ac9db
NB		 1895 /*
1896 * Write out any ISID value to APTPL metadata that was included
1897 * in the original registration.
1898 */
1899 if (pr_reg->isid_present_at_reg)
1900 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1901 pr_reg->pr_reg_isid);
1902 /*
1903 * Include special metadata if the pr_reg matches the
1904 * reservation holder.
1905 */
1906 if (dev->dev_pr_res_holder == pr_reg) {
1907 snprintf(tmp, 512, "PR_REG_START: %d"
1908 "\ninitiator_fabric=%s\n"
1909 "initiator_node=%s\n%s"
1910 "sa_res_key=%llu\n"
1911 "res_holder=1\nres_type=%02x\n"
1912 "res_scope=%02x\nres_all_tg_pt=%d\n"
f2d30680 1913 "mapped_lun=%llu\n", reg_count,
e3d6f909 1914 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1915 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1916 pr_reg->pr_res_key, pr_reg->pr_res_type,
1917 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1918 pr_reg->pr_res_mapped_lun);
1919 } else {
1920 snprintf(tmp, 512, "PR_REG_START: %d\n"
1921 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1922 "sa_res_key=%llu\nres_holder=0\n"
f2d30680 1923 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
e3d6f909 1924 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1925 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1926 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1927 pr_reg->pr_res_mapped_lun);
1928 }
1929
60d645a4 1930 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1931 pr_err("Unable to update renaming APTPL metadata,"
1932 " reallocating larger buffer\n");
3c8a6228
AG		 1933 ret = -EMSGSIZE;
1934 goto out;
c66ac9db
NB		 1935 }
1936 len += sprintf(buf+len, "%s", tmp);
1937
1938 /*
1939 * Include information about the associated SCSI target port.
1940 */
1941 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
f2d30680 1942 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
e3d6f909
AG		 1943 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1944 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1945 tpg->se_tpg_tfo->tpg_get_tag(tpg),
79dc9c9e
NB		 1946 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1947 reg_count);
c66ac9db 1948
60d645a4 1949 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1950 pr_err("Unable to update renaming APTPL metadata,"
1951 " reallocating larger buffer\n");
3c8a6228
AG		 1952 ret = -EMSGSIZE;
1953 goto out;
c66ac9db
NB		 1954 }
1955 len += sprintf(buf+len, "%s", tmp);
1956 reg_count++;
1957 }
c66ac9db 1958
6708bb27 1959 if (!reg_count)
c66ac9db
NB		 1960 len += sprintf(buf+len, "No Registrations or Reservations");
1961
3c8a6228
AG		 1962out:
1963 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1964 spin_unlock(&dev->dev_reservation_lock);
1965
1966 return ret;
1967}
1968
c66ac9db
NB		 1969static int __core_scsi3_write_aptpl_to_file(
1970 struct se_device *dev,
4dee96fb 1971 unsigned char *buf)
c66ac9db 1972{
0fd97ccf 1973 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1974 struct file *file;
c66ac9db
NB		 1975 int flags = O_RDWR | O_CREAT | O_TRUNC;
1976 char path[512];
4dee96fb 1977 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1978 int ret;
1979
c66ac9db
NB		 1980 memset(path, 0, 512);
1981
60d645a4 1982 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1983 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1984 " into path buffer\n");
e3d6f909 1985 return -EMSGSIZE;
c66ac9db
NB		 1986 }
1987
fdddf932 1988 snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]);
c66ac9db 1989 file = filp_open(path, flags, 0600);
0e9b10a9 1990 if (IS_ERR(file)) {
6708bb27 1991 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1992 " failed\n", path);
0e9b10a9 1993 return PTR_ERR(file);
c66ac9db
NB		 1994 }
1995
4dee96fb 1996 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1997
0e9b10a9 1998 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1999
0e9b10a9 2000 if (ret < 0)
6708bb27 2001 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 2002 fput(file);
c66ac9db 2003
f730f915 2004 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 2005}
2006
459f213b
AG		 2007/*
2008 * Clear the APTPL metadata if APTPL has been disabled, otherwise
2009 * write out the updated metadata to struct file for this SCSI device.
2010 */
8a391857 2011static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 2012{
8a391857 2013 unsigned char *buf;
f161d4b4 2014 int rc, len = PR_APTPL_BUF_LEN;
de103c93 2015
459f213b
AG		 2016 if (!aptpl) {
2017 char *null_buf = "No Registrations or Reservations\n";
2018
8a391857 2019 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 2020 dev->t10_pr.pr_aptpl_active = 0;
2021 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 2022
8a391857
NB		 2023 if (rc)
2024 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 2025
8a391857
NB		 2026 return 0;
2027 }
f161d4b4
NB		 2028retry:
2029 buf = vzalloc(len);
8a391857
NB		 2030 if (!buf)
2031 return TCM_OUT_OF_RESOURCES;
2032
f161d4b4 2033 rc = core_scsi3_update_aptpl_buf(dev, buf, len);
8a391857 2034 if (rc < 0) {
f161d4b4
NB		 2035 vfree(buf);
2036 len *= 2;
2037 goto retry;
c66ac9db
NB		 2038 }
2039
8a391857
NB		 2040 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2041 if (rc != 0) {
2042 pr_err("SPC-3 PR: Could not update APTPL\n");
f161d4b4 2043 vfree(buf);
8a391857
NB		 2044 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2045 }
2046 dev->t10_pr.pr_aptpl_active = 1;
f161d4b4 2047 vfree(buf);
8a391857
NB		 2048 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2049 return 0;
c66ac9db
NB		 2050}
2051
de103c93
CH		 2052static sense_reason_t
2053core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 2054 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 2055{
e3d6f909 2056 struct se_session *se_sess = cmd->se_sess;
5951146d 2057 struct se_device *dev = cmd->se_dev;
e3d6f909 2058 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2059 struct se_portal_group *se_tpg;
bc118fe4 2060 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2061 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2062 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2063 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2064 int pr_holder = 0, type;
c66ac9db 2065
6708bb27
AG		 2066 if (!se_sess || !se_lun) {
2067 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2068 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2069 }
2070 se_tpg = se_sess->se_tpg;
c66ac9db 2071
e3d6f909 2072 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2073 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2074 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2075 PR_REG_ISID_LEN);
2076 isid_ptr = &isid_buf[0];
2077 }
2078 /*
2079 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2080 */
bc118fe4
AG		 2081 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2082 if (!pr_reg) {
c66ac9db 2083 if (res_key) {
6708bb27 2084 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2085 " for SA REGISTER, returning CONFLICT\n");
de103c93 2086 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2087 }
2088 /*
2089 * Do nothing but return GOOD status.
2090 */
6708bb27 2091 if (!sa_res_key)
03e98c9e 2092 return 0;
c66ac9db 2093
6708bb27 2094 if (!spec_i_pt) {
c66ac9db
NB		 2095 /*
2096 * Perform the Service Action REGISTER on the Initiator
2097 * Port Endpoint that the PRO was received from on the
2098 * Logical Unit of the SCSI device server.
2099 */
de103c93 2100 if (core_scsi3_alloc_registration(cmd->se_dev,
79dc9c9e
NB		 2101 se_sess->se_node_acl, cmd->se_lun,
2102 NULL, cmd->orig_fe_lun, isid_ptr,
c66ac9db 2103 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2104 register_type, 0)) {
6708bb27 2105 pr_err("Unable to allocate"
c66ac9db 2106 " struct t10_pr_registration\n");
de103c93 2107 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2108 }
2109 } else {
2110 /*
2111 * Register both the Initiator port that received
2112 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2113 * TransportID from Parameter list and loop through
2114 * fabric dependent parameter list while calling
2115 * logic from of core_scsi3_alloc_registration() for
2116 * each TransportID provided SCSI Initiator Port/Device
2117 */
2118 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2119 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2120 if (ret != 0)
2121 return ret;
2122 }
459f213b 2123 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2124 }
2125
bc118fe4
AG		 2126 /* ok, existing registration */
2127
2128 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2129 pr_err("SPC-3 PR REGISTER: Received"
2130 " res_key: 0x%016Lx does not match"
2131 " existing SA REGISTER res_key:"
2132 " 0x%016Lx\n", res_key,
2133 pr_reg->pr_res_key);
2134 ret = TCM_RESERVATION_CONFLICT;
2135 goto out;
de103c93
CH		 2136 }
2137
2138 if (spec_i_pt) {
1f070cc2
AG		 2139 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2140 " set on a registered nexus\n");
de103c93 2141 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2142 goto out;
de103c93
CH		 2143 }
2144
2145 /*
2146 * An existing ALL_TG_PT=1 registration being released
2147 * must also set ALL_TG_PT=1 in the incoming PROUT.
2148 */
1f070cc2
AG		 2149 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2150 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2151 " registration exists, but ALL_TG_PT=1 bit not"
2152 " present in received PROUT\n");
2153 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2154 goto out;
de103c93
CH		 2155 }
2156
de103c93 2157 /*
51d9c41d 2158 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2159 */
51d9c41d
AG		 2160 if (sa_res_key) {
2161 /*
2162 * Increment PRgeneration counter for struct se_device"
2163 * upon a successful REGISTER, see spc4r17 section 6.3.2
2164 * READ_KEYS service action.
2165 */
2166 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2167 pr_reg->pr_res_key = sa_res_key;
2168 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2169 " Key for %s to: 0x%016Lx PRgeneration:"
2170 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2171 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2172 pr_reg->pr_reg_nacl->initiatorname,
2173 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2174
2175 } else {
2176 /*
2177 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2178 */
6c3c9baa
NB		 2179 type = pr_reg->pr_res_type;
2180 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2181 pr_reg);
de103c93 2182 if (pr_holder < 0) {
de103c93 2183 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2184 goto out;
c66ac9db 2185 }
de103c93
CH		 2186
2187 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2188 /*
de103c93
CH		 2189 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2190 * and matching pr_res_key.
c66ac9db 2191 */
de103c93
CH		 2192 if (pr_reg->pr_reg_all_tg_pt) {
2193 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2194 &pr_tmpl->registration_list,
2195 pr_reg_list) {
2196
2197 if (!pr_reg_p->pr_reg_all_tg_pt)
2198 continue;
2199 if (pr_reg_p->pr_res_key != res_key)
2200 continue;
2201 if (pr_reg == pr_reg_p)
2202 continue;
2203 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2204 pr_reg_p->pr_reg_nacl->initiatorname))
2205 continue;
2206
2207 __core_scsi3_free_registration(dev,
2208 pr_reg_p, NULL, 0);
c66ac9db
NB		 2209 }
2210 }
de103c93 2211
c66ac9db 2212 /*
de103c93 2213 * Release the calling I_T Nexus registration now..
c66ac9db 2214 */
de103c93 2215 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2216 pr_reg = NULL;
c66ac9db 2217
de103c93
CH		 2218 /*
2219 * From spc4r17, section 5.7.11.3 Unregistering
2220 *
2221 * If the persistent reservation is a registrants only
2222 * type, the device server shall establish a unit
2223 * attention condition for the initiator port associated
2224 * with every registered I_T nexus except for the I_T
2225 * nexus on which the PERSISTENT RESERVE OUT command was
2226 * received, with the additional sense code set to
2227 * RESERVATIONS RELEASED.
2228 */
2229 if (pr_holder &&
fc09149d
NB		 2230 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2231 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2232 list_for_each_entry(pr_reg_p,
2233 &pr_tmpl->registration_list,
2234 pr_reg_list) {
2235
c51c8e7b 2236 target_ua_allocate_lun(
de103c93
CH		 2237 pr_reg_p->pr_reg_nacl,
2238 pr_reg_p->pr_res_mapped_lun,
2239 0x2A,
2240 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2241 }
de103c93 2242 }
c66ac9db 2243
51d9c41d 2244 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2245 }
c66ac9db 2246
459f213b 2247 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2248
bc118fe4 2249out:
fc09149d
NB		 2250 if (pr_reg)
2251 core_scsi3_put_pr_reg(pr_reg);
de103c93 2252 return ret;
c66ac9db
NB		 2253}
2254
2255unsigned char *core_scsi3_pr_dump_type(int type)
2256{
2257 switch (type) {
2258 case PR_TYPE_WRITE_EXCLUSIVE:
2259 return "Write Exclusive Access";
2260 case PR_TYPE_EXCLUSIVE_ACCESS:
2261 return "Exclusive Access";
2262 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2263 return "Write Exclusive Access, Registrants Only";
2264 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2265 return "Exclusive Access, Registrants Only";
2266 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2267 return "Write Exclusive Access, All Registrants";
2268 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2269 return "Exclusive Access, All Registrants";
2270 default:
2271 break;
2272 }
2273
2274 return "Unknown SPC-3 PR Type";
2275}
2276
de103c93
CH		 2277static sense_reason_t
2278core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2279{
de103c93 2280 struct se_device *dev = cmd->se_dev;
e3d6f909 2281 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2282 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2283 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2284 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2285 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2286 sense_reason_t ret;
c66ac9db
NB		 2287
2288 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2289
6708bb27
AG		 2290 if (!se_sess || !se_lun) {
2291 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2293 }
c66ac9db
NB		 2294 /*
2295 * Locate the existing *pr_reg via struct se_node_acl pointers
2296 */
5951146d 2297 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2298 se_sess);
6708bb27
AG		 2299 if (!pr_reg) {
2300 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2301 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2302 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2303 }
2304 /*
2305 * From spc4r17 Section 5.7.9: Reserving:
2306 *
2307 * An application client creates a persistent reservation by issuing
2308 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2309 * a registered I_T nexus with the following parameters:
2310 * a) RESERVATION KEY set to the value of the reservation key that is
2311 * registered with the logical unit for the I_T nexus; and
2312 */
2313 if (res_key != pr_reg->pr_res_key) {
6708bb27 2314 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2315 " does not match existing SA REGISTER res_key:"
2316 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2317 ret = TCM_RESERVATION_CONFLICT;
2318 goto out_put_pr_reg;
c66ac9db
NB		 2319 }
2320 /*
2321 * From spc4r17 Section 5.7.9: Reserving:
2322 *
2323 * From above:
2324 * b) TYPE field and SCOPE field set to the persistent reservation
2325 * being created.
2326 *
2327 * Only one persistent reservation is allowed at a time per logical unit
2328 * and that persistent reservation has a scope of LU_SCOPE.
2329 */
2330 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2331 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2332 ret = TCM_INVALID_PARAMETER_LIST;
2333 goto out_put_pr_reg;
c66ac9db
NB		 2334 }
2335 /*
2336 * See if we have an existing PR reservation holder pointer at
2337 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2338 * *pr_res_holder.
2339 */
2340 spin_lock(&dev->dev_reservation_lock);
2341 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2342 if (pr_res_holder) {
c66ac9db
NB		 2343 /*
2344 * From spc4r17 Section 5.7.9: Reserving:
2345 *
2346 * If the device server receives a PERSISTENT RESERVE OUT
2347 * command from an I_T nexus other than a persistent reservation
2348 * holder (see 5.7.10) that attempts to create a persistent
2349 * reservation when a persistent reservation already exists for
2350 * the logical unit, then the command shall be completed with
2351 * RESERVATION CONFLICT status.
2352 */
e673dc92 2353 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2354 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2355 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2356 " [%s]: %s while reservation already held by"
2357 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2358 cmd->se_tfo->get_fabric_name(),
c66ac9db 2359 se_sess->se_node_acl->initiatorname,
e3d6f909 2360 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2361 pr_res_holder->pr_reg_nacl->initiatorname);
2362
2363 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2364 ret = TCM_RESERVATION_CONFLICT;
2365 goto out_put_pr_reg;
c66ac9db
NB		 2366 }
2367 /*
2368 * From spc4r17 Section 5.7.9: Reserving:
2369 *
2370 * If a persistent reservation holder attempts to modify the
2371 * type or scope of an existing persistent reservation, the
2372 * command shall be completed with RESERVATION CONFLICT status.
2373 */
2374 if ((pr_res_holder->pr_res_type != type) ||
2375 (pr_res_holder->pr_res_scope != scope)) {
2376 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2377 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2378 " [%s]: %s trying to change TYPE and/or SCOPE,"
2379 " while reservation already held by [%s]: %s,"
2380 " returning RESERVATION_CONFLICT\n",
e3d6f909 2381 cmd->se_tfo->get_fabric_name(),
c66ac9db 2382 se_sess->se_node_acl->initiatorname,
e3d6f909 2383 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2384 pr_res_holder->pr_reg_nacl->initiatorname);
2385
2386 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2387 ret = TCM_RESERVATION_CONFLICT;
2388 goto out_put_pr_reg;
c66ac9db
NB		 2389 }
2390 /*
2391 * From spc4r17 Section 5.7.9: Reserving:
2392 *
2393 * If the device server receives a PERSISTENT RESERVE OUT
2394 * command with RESERVE service action where the TYPE field and
2395 * the SCOPE field contain the same values as the existing type
2396 * and scope from a persistent reservation holder, it shall not
2397 * make any change to the existing persistent reservation and
2398 * shall completethe command with GOOD status.
2399 */
2400 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2401 ret = 0;
2402 goto out_put_pr_reg;
c66ac9db
NB		 2403 }
2404 /*
2405 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2406 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2407 */
2408 pr_reg->pr_res_scope = scope;
2409 pr_reg->pr_res_type = type;
2410 pr_reg->pr_res_holder = 1;
2411 dev->dev_pr_res_holder = pr_reg;
d2843c17 2412 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2413
6708bb27 2414 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2415 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2416 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2417 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2418 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2419 cmd->se_tfo->get_fabric_name(),
c66ac9db 2420 se_sess->se_node_acl->initiatorname,
d2843c17 2421 i_buf);
c66ac9db
NB		 2422 spin_unlock(&dev->dev_reservation_lock);
2423
459f213b
AG		 2424 if (pr_tmpl->pr_aptpl_active)
2425 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2426
de103c93
CH		 2427 ret = 0;
2428out_put_pr_reg:
c66ac9db 2429 core_scsi3_put_pr_reg(pr_reg);
de103c93 2430 return ret;
c66ac9db
NB		 2431}
2432
de103c93
CH		 2433static sense_reason_t
2434core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2435 u64 res_key)
c66ac9db 2436{
c66ac9db
NB		 2437 switch (type) {
2438 case PR_TYPE_WRITE_EXCLUSIVE:
2439 case PR_TYPE_EXCLUSIVE_ACCESS:
2440 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2441 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2442 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2443 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2444 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2445 default:
6708bb27 2446 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2447 " 0x%02x\n", type);
de103c93 2448 return TCM_INVALID_CDB_FIELD;
c66ac9db 2449 }
c66ac9db
NB		 2450}
2451
2452/*
2453 * Called with struct se_device->dev_reservation_lock held.
2454 */
2455static void __core_scsi3_complete_pro_release(
2456 struct se_device *dev,
2457 struct se_node_acl *se_nacl,
2458 struct t10_pr_registration *pr_reg,
6c3c9baa
NB		 2459 int explicit,
2460 int unreg)
c66ac9db 2461{
9ac8928e 2462 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
c66ac9db 2463 char i_buf[PR_REG_ISID_ID_LEN];
6c3c9baa 2464 int pr_res_type = 0, pr_res_scope = 0;
c66ac9db
NB		 2465
2466 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2467 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2468 /*
2469 * Go ahead and release the current PR reservation holder.
6c3c9baa
NB		 2470 * If an All Registrants reservation is currently active and
2471 * a unregister operation is requested, replace the current
2472 * dev_pr_res_holder with another active registration.
2473 */
2474 if (dev->dev_pr_res_holder) {
2475 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2476 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2477 dev->dev_pr_res_holder->pr_res_type = 0;
2478 dev->dev_pr_res_holder->pr_res_scope = 0;
2479 dev->dev_pr_res_holder->pr_res_holder = 0;
2480 dev->dev_pr_res_holder = NULL;
2481 }
2482 if (!unreg)
2483 goto out;
c66ac9db 2484
6c3c9baa
NB		 2485 spin_lock(&dev->t10_pr.registration_lock);
2486 list_del_init(&pr_reg->pr_reg_list);
2487 /*
2488 * If the I_T nexus is a reservation holder, the persistent reservation
2489 * is of an all registrants type, and the I_T nexus is the last remaining
2490 * registered I_T nexus, then the device server shall also release the
2491 * persistent reservation.
2492 */
2493 if (!list_empty(&dev->t10_pr.registration_list) &&
2494 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2495 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2496 dev->dev_pr_res_holder =
2497 list_entry(dev->t10_pr.registration_list.next,
2498 struct t10_pr_registration, pr_reg_list);
2499 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2500 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2501 dev->dev_pr_res_holder->pr_res_holder = 1;
2502 }
2503 spin_unlock(&dev->t10_pr.registration_lock);
2504out:
2505 if (!dev->dev_pr_res_holder) {
2506 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2507 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2508 tfo->get_fabric_name(), (explicit) ? "explicit" :
2509 "implicit", core_scsi3_pr_dump_type(pr_res_type),
2510 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2511 }
6708bb27 2512 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2513 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2514 i_buf);
c66ac9db
NB		 2515 /*
2516 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2517 */
2518 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2519}
2520
de103c93
CH		 2521static sense_reason_t
2522core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2523 u64 res_key)
c66ac9db
NB		 2524{
2525 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2526 struct se_session *se_sess = cmd->se_sess;
2527 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2528 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2529 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93 2530 sense_reason_t ret = 0;
c66ac9db 2531
6708bb27
AG		 2532 if (!se_sess || !se_lun) {
2533 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2534 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2535 }
2536 /*
2537 * Locate the existing *pr_reg via struct se_node_acl pointers
2538 */
2539 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2540 if (!pr_reg) {
2541 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2542 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2543 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2544 }
2545 /*
2546 * From spc4r17 Section 5.7.11.2 Releasing:
2547 *
2548 * If there is no persistent reservation or in response to a persistent
2549 * reservation release request from a registered I_T nexus that is not a
2550 * persistent reservation holder (see 5.7.10), the device server shall
2551 * do the following:
2552 *
2553 * a) Not release the persistent reservation, if any;
2554 * b) Not remove any registrations; and
2555 * c) Complete the command with GOOD status.
2556 */
2557 spin_lock(&dev->dev_reservation_lock);
2558 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2559 if (!pr_res_holder) {
c66ac9db
NB		 2560 /*
2561 * No persistent reservation, return GOOD status.
2562 */
2563 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2564 goto out_put_pr_reg;
c66ac9db 2565 }
c66ac9db 2566
e673dc92 2567 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2568 /*
c66ac9db
NB		 2569 * Release request from a registered I_T nexus that is not a
2570 * persistent reservation holder. return GOOD status.
2571 */
2572 spin_unlock(&dev->dev_reservation_lock);
de103c93 2573 goto out_put_pr_reg;
c66ac9db 2574 }
de103c93 2575
c66ac9db
NB		 2576 /*
2577 * From spc4r17 Section 5.7.11.2 Releasing:
2578 *
2579 * Only the persistent reservation holder (see 5.7.10) is allowed to
2580 * release a persistent reservation.
2581 *
2582 * An application client releases the persistent reservation by issuing
2583 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2584 * an I_T nexus that is a persistent reservation holder with the
2585 * following parameters:
2586 *
2587 * a) RESERVATION KEY field set to the value of the reservation key
2588 * that is registered with the logical unit for the I_T nexus;
2589 */
2590 if (res_key != pr_reg->pr_res_key) {
6708bb27 2591 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2592 " does not match existing SA REGISTER res_key:"
2593 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2594 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2595 ret = TCM_RESERVATION_CONFLICT;
2596 goto out_put_pr_reg;
c66ac9db
NB		 2597 }
2598 /*
2599 * From spc4r17 Section 5.7.11.2 Releasing and above:
2600 *
2601 * b) TYPE field and SCOPE field set to match the persistent
2602 * reservation being released.
2603 */
2604 if ((pr_res_holder->pr_res_type != type) ||
2605 (pr_res_holder->pr_res_scope != scope)) {
2606 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2607 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2608 " reservation from [%s]: %s with different TYPE "
2609 "and/or SCOPE while reservation already held by"
2610 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2611 cmd->se_tfo->get_fabric_name(),
c66ac9db 2612 se_sess->se_node_acl->initiatorname,
e3d6f909 2613 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2614 pr_res_holder->pr_reg_nacl->initiatorname);
2615
2616 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2617 ret = TCM_RESERVATION_CONFLICT;
2618 goto out_put_pr_reg;
c66ac9db
NB		 2619 }
2620 /*
2621 * In response to a persistent reservation release request from the
2622 * persistent reservation holder the device server shall perform a
2623 * release by doing the following as an uninterrupted series of actions:
2624 * a) Release the persistent reservation;
2625 * b) Not remove any registration(s);
2626 * c) If the released persistent reservation is a registrants only type
2627 * or all registrants type persistent reservation,
2628 * the device server shall establish a unit attention condition for
2629 * the initiator port associated with every regis-
2630 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2631 * RESERVE OUT command with RELEASE service action was received,
2632 * with the additional sense code set to RESERVATIONS RELEASED; and
2633 * d) If the persistent reservation is of any other type, the device
2634 * server shall not establish a unit attention condition.
2635 */
2636 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
6c3c9baa 2637 pr_reg, 1, 0);
c66ac9db
NB		 2638
2639 spin_unlock(&dev->dev_reservation_lock);
2640
2641 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2642 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2643 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2644 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2645 /*
2646 * If no UNIT ATTENTION conditions will be established for
2647 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2648 * go ahead and check for APTPL=1 update+write below
2649 */
2650 goto write_aptpl;
2651 }
2652
2653 spin_lock(&pr_tmpl->registration_lock);
2654 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2655 pr_reg_list) {
2656 /*
2657 * Do not establish a UNIT ATTENTION condition
2658 * for the calling I_T Nexus
2659 */
2660 if (pr_reg_p == pr_reg)
2661 continue;
2662
c51c8e7b 2663 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
c66ac9db
NB		 2664 pr_reg_p->pr_res_mapped_lun,
2665 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2666 }
2667 spin_unlock(&pr_tmpl->registration_lock);
2668
2669write_aptpl:
459f213b
AG		 2670 if (pr_tmpl->pr_aptpl_active)
2671 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2672
de103c93 2673out_put_pr_reg:
c66ac9db 2674 core_scsi3_put_pr_reg(pr_reg);
de103c93 2675 return ret;
c66ac9db
NB		 2676}
2677
de103c93
CH		 2678static sense_reason_t
2679core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2680{
2681 struct se_device *dev = cmd->se_dev;
2682 struct se_node_acl *pr_reg_nacl;
e3d6f909 2683 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2684 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2685 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
f2d30680 2686 u64 pr_res_mapped_lun = 0;
c66ac9db
NB		 2687 int calling_it_nexus = 0;
2688 /*
2689 * Locate the existing *pr_reg via struct se_node_acl pointers
2690 */
5951146d 2691 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2692 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2693 if (!pr_reg_n) {
2694 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2695 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2696 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2697 }
2698 /*
2699 * From spc4r17 section 5.7.11.6, Clearing:
2700 *
2701 * Any application client may release the persistent reservation and
2702 * remove all registrations from a device server by issuing a
2703 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2704 * registered I_T nexus with the following parameter:
2705 *
2706 * a) RESERVATION KEY field set to the value of the reservation key
2707 * that is registered with the logical unit for the I_T nexus.
2708 */
2709 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2710 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2711 " res_key: 0x%016Lx does not match"
2712 " existing SA REGISTER res_key:"
2713 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2714 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2715 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2716 }
2717 /*
2718 * a) Release the persistent reservation, if any;
2719 */
2720 spin_lock(&dev->dev_reservation_lock);
2721 pr_res_holder = dev->dev_pr_res_holder;
2722 if (pr_res_holder) {
2723 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2724 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 2725 pr_res_holder, 0, 0);
c66ac9db
NB		 2726 }
2727 spin_unlock(&dev->dev_reservation_lock);
2728 /*
2729 * b) Remove all registration(s) (see spc4r17 5.7.7);
2730 */
2731 spin_lock(&pr_tmpl->registration_lock);
2732 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2733 &pr_tmpl->registration_list, pr_reg_list) {
2734
2735 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2736 pr_reg_nacl = pr_reg->pr_reg_nacl;
2737 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2738 __core_scsi3_free_registration(dev, pr_reg, NULL,
2739 calling_it_nexus);
2740 /*
2741 * e) Establish a unit attention condition for the initiator
2742 * port associated with every registered I_T nexus other
2743 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2744 * command with CLEAR service action was received, with the
2745 * additional sense code set to RESERVATIONS PREEMPTED.
2746 */
6708bb27 2747 if (!calling_it_nexus)
c51c8e7b 2748 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
c66ac9db
NB		 2749 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2750 }
2751 spin_unlock(&pr_tmpl->registration_lock);
2752
6708bb27 2753 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2754 cmd->se_tfo->get_fabric_name());
c66ac9db 2755
459f213b 2756 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2757
2758 core_scsi3_pr_generation(dev);
2759 return 0;
2760}
2761
2762/*
2763 * Called with struct se_device->dev_reservation_lock held.
2764 */
2765static void __core_scsi3_complete_pro_preempt(
2766 struct se_device *dev,
2767 struct t10_pr_registration *pr_reg,
2768 struct list_head *preempt_and_abort_list,
2769 int type,
2770 int scope,
33ce6a87 2771 enum preempt_type preempt_type)
c66ac9db
NB		 2772{
2773 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
9ac8928e 2774 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 2775 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2776
2777 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2778 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2779 /*
125d0119 2780 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2781 */
2782 if (dev->dev_pr_res_holder)
2783 __core_scsi3_complete_pro_release(dev, nacl,
6c3c9baa 2784 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2785
2786 dev->dev_pr_res_holder = pr_reg;
2787 pr_reg->pr_res_holder = 1;
2788 pr_reg->pr_res_type = type;
2789 pr_reg->pr_res_scope = scope;
2790
6708bb27 2791 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2792 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2793 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2794 core_scsi3_pr_dump_type(type),
2795 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2796 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2797 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2798 nacl->initiatorname, i_buf);
c66ac9db
NB		 2799 /*
2800 * For PREEMPT_AND_ABORT, add the preempting reservation's
2801 * struct t10_pr_registration to the list that will be compared
2802 * against received CDBs..
2803 */
2804 if (preempt_and_abort_list)
2805 list_add_tail(&pr_reg->pr_reg_abort_list,
2806 preempt_and_abort_list);
2807}
2808
2809static void core_scsi3_release_preempt_and_abort(
2810 struct list_head *preempt_and_abort_list,
2811 struct t10_pr_registration *pr_reg_holder)
2812{
2813 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2814
2815 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2816 pr_reg_abort_list) {
2817
2818 list_del(&pr_reg->pr_reg_abort_list);
2819 if (pr_reg_holder == pr_reg)
2820 continue;
2821 if (pr_reg->pr_res_holder) {
6708bb27 2822 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2823 continue;
2824 }
2825
2826 pr_reg->pr_reg_deve = NULL;
2827 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2828 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2829 }
2830}
2831
de103c93
CH		 2832static sense_reason_t
2833core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2834 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2835{
5951146d 2836 struct se_device *dev = cmd->se_dev;
c66ac9db 2837 struct se_node_acl *pr_reg_nacl;
e3d6f909 2838 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2839 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2840 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2841 struct t10_reservation *pr_tmpl = &dev->t10_pr;
f2d30680 2842 u64 pr_res_mapped_lun = 0;
b6932ee3
SA		 2843 int all_reg = 0, calling_it_nexus = 0;
2844 bool sa_res_key_unmatched = sa_res_key != 0;
de103c93 2845 int prh_type = 0, prh_scope = 0;
c66ac9db 2846
de103c93
CH		 2847 if (!se_sess)
2848 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2849
5951146d 2850 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2851 se_sess);
6708bb27
AG		 2852 if (!pr_reg_n) {
2853 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2854 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2855 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2856 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2857 }
2858 if (pr_reg_n->pr_res_key != res_key) {
2859 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2860 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2861 }
2862 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2863 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2864 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2865 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2866 }
c66ac9db
NB		 2867
2868 spin_lock(&dev->dev_reservation_lock);
2869 pr_res_holder = dev->dev_pr_res_holder;
2870 if (pr_res_holder &&
2871 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2872 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2873 all_reg = 1;
2874
6708bb27 2875 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2876 spin_unlock(&dev->dev_reservation_lock);
2877 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2878 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2879 }
2880 /*
2881 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2882 *
2883 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2884 * persistent reservation holder or there is no persistent reservation
2885 * holder (i.e., there is no persistent reservation), then the device
2886 * server shall perform a preempt by doing the following in an
2887 * uninterrupted series of actions. (See below..)
2888 */
6708bb27 2889 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2890 /*
2891 * No existing or SA Reservation Key matching reservations..
2892 *
2893 * PROUT SA PREEMPT with All Registrant type reservations are
2894 * allowed to be processed without a matching SA Reservation Key
2895 */
2896 spin_lock(&pr_tmpl->registration_lock);
2897 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2898 &pr_tmpl->registration_list, pr_reg_list) {
2899 /*
2900 * Removing of registrations in non all registrants
2901 * type reservations without a matching SA reservation
2902 * key.
2903 *
2904 * a) Remove the registrations for all I_T nexuses
2905 * specified by the SERVICE ACTION RESERVATION KEY
2906 * field;
2907 * b) Ignore the contents of the SCOPE and TYPE fields;
2908 * c) Process tasks as defined in 5.7.1; and
2909 * d) Establish a unit attention condition for the
2910 * initiator port associated with every I_T nexus
2911 * that lost its registration other than the I_T
2912 * nexus on which the PERSISTENT RESERVE OUT command
2913 * was received, with the additional sense code set
2914 * to REGISTRATIONS PREEMPTED.
2915 */
6708bb27 2916 if (!all_reg) {
c66ac9db
NB		 2917 if (pr_reg->pr_res_key != sa_res_key)
2918 continue;
b6932ee3 2919 sa_res_key_unmatched = false;
c66ac9db
NB		 2920
2921 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2922 pr_reg_nacl = pr_reg->pr_reg_nacl;
2923 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2924 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2925 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2926 NULL, calling_it_nexus);
c66ac9db
NB		 2927 } else {
2928 /*
2929 * Case for any existing all registrants type
2930 * reservation, follow logic in spc4r17 section
2931 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2932 *
2933 * For a ZERO SA Reservation key, release
125d0119 2934 * all other registrations and do an implicit
c66ac9db
NB		 2935 * release of active persistent reservation.
2936 *
2937 * For a non-ZERO SA Reservation key, only
2938 * release the matching reservation key from
2939 * registrations.
2940 */
2941 if ((sa_res_key) &&
2942 (pr_reg->pr_res_key != sa_res_key))
2943 continue;
b6932ee3 2944 sa_res_key_unmatched = false;
c66ac9db
NB		 2945
2946 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2947 if (calling_it_nexus)
2948 continue;
2949
2950 pr_reg_nacl = pr_reg->pr_reg_nacl;
2951 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2952 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2953 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2954 NULL, 0);
c66ac9db 2955 }
6708bb27 2956 if (!calling_it_nexus)
c51c8e7b 2957 target_ua_allocate_lun(pr_reg_nacl,
c66ac9db 2958 pr_res_mapped_lun, 0x2A,
9e08e34e 2959 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2960 }
2961 spin_unlock(&pr_tmpl->registration_lock);
2962 /*
2963 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2964 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2965 * RESERVATION KEY field to a value that does not match any
2966 * registered reservation key, then the device server shall
2967 * complete the command with RESERVATION CONFLICT status.
2968 */
b6932ee3 2969 if (sa_res_key_unmatched) {
c66ac9db
NB		 2970 spin_unlock(&dev->dev_reservation_lock);
2971 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2972 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2973 }
2974 /*
2975 * For an existing all registrants type reservation
2976 * with a zero SA rservation key, preempt the existing
2977 * reservation with the new PR type and scope.
2978 */
2979 if (pr_res_holder && all_reg && !(sa_res_key)) {
2980 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2981 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2982 type, scope, preempt_type);
c66ac9db 2983
33ce6a87 2984 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2985 core_scsi3_release_preempt_and_abort(
2986 &preempt_and_abort_list, pr_reg_n);
2987 }
2988 spin_unlock(&dev->dev_reservation_lock);
2989
459f213b
AG		 2990 if (pr_tmpl->pr_aptpl_active)
2991 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2992
2993 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2994 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2995 return 0;
2996 }
2997 /*
2998 * The PREEMPTing SA reservation key matches that of the
2999 * existing persistent reservation, first, we check if
3000 * we are preempting our own reservation.
3001 * From spc4r17, section 5.7.11.4.3 Preempting
3002 * persistent reservations and registration handling
3003 *
3004 * If an all registrants persistent reservation is not
3005 * present, it is not an error for the persistent
3006 * reservation holder to preempt itself (i.e., a
3007 * PERSISTENT RESERVE OUT with a PREEMPT service action
3008 * or a PREEMPT AND ABORT service action with the
3009 * SERVICE ACTION RESERVATION KEY value equal to the
3010 * persistent reservation holder's reservation key that
3011 * is received from the persistent reservation holder).
3012 * In that case, the device server shall establish the
3013 * new persistent reservation and maintain the
3014 * registration.
3015 */
3016 prh_type = pr_res_holder->pr_res_type;
3017 prh_scope = pr_res_holder->pr_res_scope;
3018 /*
3019 * If the SERVICE ACTION RESERVATION KEY field identifies a
3020 * persistent reservation holder (see 5.7.10), the device
3021 * server shall perform a preempt by doing the following as
3022 * an uninterrupted series of actions:
3023 *
3024 * a) Release the persistent reservation for the holder
3025 * identified by the SERVICE ACTION RESERVATION KEY field;
3026 */
3027 if (pr_reg_n != pr_res_holder)
3028 __core_scsi3_complete_pro_release(dev,
6c3c9baa
NB		 3029 pr_res_holder->pr_reg_nacl,
3030 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3031 /*
3032 * b) Remove the registrations for all I_T nexuses identified
3033 * by the SERVICE ACTION RESERVATION KEY field, except the
3034 * I_T nexus that is being used for the PERSISTENT RESERVE
3035 * OUT command. If an all registrants persistent reservation
3036 * is present and the SERVICE ACTION RESERVATION KEY field
3037 * is set to zero, then all registrations shall be removed
3038 * except for that of the I_T nexus that is being used for
3039 * the PERSISTENT RESERVE OUT command;
3040 */
3041 spin_lock(&pr_tmpl->registration_lock);
3042 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3043 &pr_tmpl->registration_list, pr_reg_list) {
3044
3045 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3046 if (calling_it_nexus)
3047 continue;
3048
3049 if (pr_reg->pr_res_key != sa_res_key)
3050 continue;
3051
3052 pr_reg_nacl = pr_reg->pr_reg_nacl;
3053 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3054 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3055 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3056 calling_it_nexus);
3057 /*
3058 * e) Establish a unit attention condition for the initiator
3059 * port associated with every I_T nexus that lost its
3060 * persistent reservation and/or registration, with the
3061 * additional sense code set to REGISTRATIONS PREEMPTED;
3062 */
c51c8e7b 3063 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3064 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3065 }
3066 spin_unlock(&pr_tmpl->registration_lock);
3067 /*
3068 * c) Establish a persistent reservation for the preempting
3069 * I_T nexus using the contents of the SCOPE and TYPE fields;
3070 */
3071 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3072 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3073 type, scope, preempt_type);
c66ac9db
NB		 3074 /*
3075 * d) Process tasks as defined in 5.7.1;
3076 * e) See above..
3077 * f) If the type or scope has changed, then for every I_T nexus
3078 * whose reservation key was not removed, except for the I_T
3079 * nexus on which the PERSISTENT RESERVE OUT command was
3080 * received, the device server shall establish a unit
3081 * attention condition for the initiator port associated with
3082 * that I_T nexus, with the additional sense code set to
3083 * RESERVATIONS RELEASED. If the type or scope have not
3084 * changed, then no unit attention condition(s) shall be
3085 * established for this reason.
3086 */
3087 if ((prh_type != type) || (prh_scope != scope)) {
3088 spin_lock(&pr_tmpl->registration_lock);
3089 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3090 &pr_tmpl->registration_list, pr_reg_list) {
3091
3092 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3093 if (calling_it_nexus)
3094 continue;
3095
c51c8e7b 3096 target_ua_allocate_lun(pr_reg->pr_reg_nacl,
c66ac9db
NB		 3097 pr_reg->pr_res_mapped_lun, 0x2A,
3098 ASCQ_2AH_RESERVATIONS_RELEASED);
3099 }
3100 spin_unlock(&pr_tmpl->registration_lock);
3101 }
3102 spin_unlock(&dev->dev_reservation_lock);
3103 /*
3104 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3105 * All received CDBs for the matching existing reservation and
3106 * registrations undergo ABORT_TASK logic.
3107 *
3108 * From there, core_scsi3_release_preempt_and_abort() will
3109 * release every registration in the list (which have already
3110 * been removed from the primary pr_reg list), except the
3111 * new persistent reservation holder, the calling Initiator Port.
3112 */
33ce6a87 3113 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3114 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3115 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3116 pr_reg_n);
3117 }
3118
459f213b
AG		 3119 if (pr_tmpl->pr_aptpl_active)
3120 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3121
3122 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3123 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3124 return 0;
3125}
3126
de103c93
CH		 3127static sense_reason_t
3128core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3129 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3130{
c66ac9db
NB		 3131 switch (type) {
3132 case PR_TYPE_WRITE_EXCLUSIVE:
3133 case PR_TYPE_EXCLUSIVE_ACCESS:
3134 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3135 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3136 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3137 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3138 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3139 sa_res_key, preempt_type);
c66ac9db 3140 default:
6708bb27 3141 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3142 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3143 return TCM_INVALID_CDB_FIELD;
c66ac9db 3144 }
c66ac9db
NB		 3145}
3146
3147
de103c93
CH		 3148static sense_reason_t
3149core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3150 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3151{
e3d6f909 3152 struct se_session *se_sess = cmd->se_sess;
5951146d 3153 struct se_device *dev = cmd->se_dev;
28168905 3154 struct se_dev_entry *dest_se_deve = NULL;
adf653f9 3155 struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
c66ac9db 3156 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
c66ac9db 3157 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
9ac8928e 3158 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
c66ac9db 3159 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3160 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3161 unsigned char *buf;
2650d71e 3162 const unsigned char *initiator_str;
13ba564c 3163 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
c66ac9db 3164 u32 tid_len, tmp_tid_len;
d2843c17 3165 int new_reg = 0, type, scope, matching_iname;
de103c93 3166 sense_reason_t ret;
c66ac9db
NB		 3167 unsigned short rtpi;
3168 unsigned char proto_ident;
3169
6708bb27
AG		 3170 if (!se_sess || !se_lun) {
3171 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3173 }
de103c93 3174
c66ac9db
NB		 3175 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3176 se_tpg = se_sess->se_tpg;
e3d6f909 3177 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3178 /*
3179 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3180 * Register behaviors for a REGISTER AND MOVE service action
3181 *
3182 * Locate the existing *pr_reg via struct se_node_acl pointers
3183 */
5951146d 3184 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3185 se_sess);
6708bb27
AG		 3186 if (!pr_reg) {
3187 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3188 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3189 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3190 }
3191 /*
3192 * The provided reservation key much match the existing reservation key
3193 * provided during this initiator's I_T nexus registration.
3194 */
3195 if (res_key != pr_reg->pr_res_key) {
6708bb27 3196 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3197 " res_key: 0x%016Lx does not match existing SA REGISTER"
3198 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3199 ret = TCM_RESERVATION_CONFLICT;
3200 goto out_put_pr_reg;
c66ac9db
NB		 3201 }
3202 /*
3203 * The service active reservation key needs to be non zero
3204 */
6708bb27
AG		 3205 if (!sa_res_key) {
3206 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3207 " sa_res_key\n");
de103c93
CH		 3208 ret = TCM_INVALID_PARAMETER_LIST;
3209 goto out_put_pr_reg;
c66ac9db 3210 }
05d1c7c0 3211
c66ac9db
NB		 3212 /*
3213 * Determine the Relative Target Port Identifier where the reservation
3214 * will be moved to for the TransportID containing SCSI initiator WWN
3215 * information.
3216 */
4949314c 3217 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3218 if (!buf) {
3219 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3220 goto out_put_pr_reg;
3221 }
3222
c66ac9db
NB		 3223 rtpi = (buf[18] & 0xff) << 8;
3224 rtpi |= buf[19] & 0xff;
3225 tid_len = (buf[20] & 0xff) << 24;
3226 tid_len |= (buf[21] & 0xff) << 16;
3227 tid_len |= (buf[22] & 0xff) << 8;
3228 tid_len |= buf[23] & 0xff;
4949314c 3229 transport_kunmap_data_sg(cmd);
05d1c7c0 3230 buf = NULL;
c66ac9db
NB		 3231
3232 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3233 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3234 " does not equal CDB data_length: %u\n", tid_len,
3235 cmd->data_length);
de103c93
CH		 3236 ret = TCM_INVALID_PARAMETER_LIST;
3237 goto out_put_pr_reg;
c66ac9db
NB		 3238 }
3239
3240 spin_lock(&dev->se_port_lock);
adf653f9
CH		 3241 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3242 if (tmp_lun->lun_rtpi != rtpi)
c66ac9db 3243 continue;
adf653f9 3244 dest_se_tpg = tmp_lun->lun_tpg;
e3d6f909 3245 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3246 if (!dest_tf_ops)
c66ac9db
NB		 3247 continue;
3248
33940d09 3249 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
c66ac9db
NB		 3250 spin_unlock(&dev->se_port_lock);
3251
de103c93 3252 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3253 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db 3254 " for dest_se_tpg\n");
33940d09 3255 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
de103c93
CH		 3256 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3257 goto out_put_pr_reg;
c66ac9db
NB		 3258 }
3259
3260 spin_lock(&dev->se_port_lock);
3261 break;
3262 }
3263 spin_unlock(&dev->se_port_lock);
3264
6708bb27
AG		 3265 if (!dest_se_tpg || !dest_tf_ops) {
3266 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3267 " fabric ops from Relative Target Port Identifier:"
3268 " %hu\n", rtpi);
de103c93
CH		 3269 ret = TCM_INVALID_PARAMETER_LIST;
3270 goto out_put_pr_reg;
c66ac9db 3271 }
05d1c7c0 3272
4949314c 3273 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3274 if (!buf) {
3275 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3276 goto out_put_pr_reg;
3277 }
c66ac9db 3278 proto_ident = (buf[24] & 0x0f);
8b1e1244 3279
6708bb27 3280 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3281 " 0x%02x\n", proto_ident);
8b1e1244 3282
2aeeafae 3283 if (proto_ident != dest_se_tpg->proto_id) {
6708bb27 3284 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3285 " proto_ident: 0x%02x does not match ident: 0x%02x"
3286 " from fabric: %s\n", proto_ident,
2aeeafae 3287 dest_se_tpg->proto_id,
c66ac9db 3288 dest_tf_ops->get_fabric_name());
de103c93 3289 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3290 goto out;
3291 }
2650d71e 3292 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
c66ac9db 3293 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3294 if (!initiator_str) {
3295 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3296 " initiator_str from Transport ID\n");
de103c93 3297 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3298 goto out;
3299 }
3300
4949314c 3301 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3302 buf = NULL;
3303
6708bb27 3304 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3305 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3306 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3307 iport_ptr : "");
3308 /*
3309 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3310 * action specifies a TransportID that is the same as the initiator port
3311 * of the I_T nexus for the command received, then the command shall
3312 * be terminated with CHECK CONDITION status, with the sense key set to
3313 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3314 * IN PARAMETER LIST.
3315 */
3316 pr_reg_nacl = pr_reg->pr_reg_nacl;
3317 matching_iname = (!strcmp(initiator_str,
3318 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3319 if (!matching_iname)
c66ac9db
NB		 3320 goto after_iport_check;
3321
6708bb27
AG		 3322 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3323 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3324 " matches: %s on received I_T Nexus\n", initiator_str,
3325 pr_reg_nacl->initiatorname);
de103c93 3326 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3327 goto out;
3328 }
6708bb27
AG		 3329 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3330 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3331 " matches: %s %s on received I_T Nexus\n",
3332 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3333 pr_reg->pr_reg_isid);
de103c93 3334 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3335 goto out;
3336 }
3337after_iport_check:
3338 /*
3339 * Locate the destination struct se_node_acl from the received Transport ID
3340 */
403edd78 3341 mutex_lock(&dest_se_tpg->acl_node_mutex);
c66ac9db
NB		 3342 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3343 initiator_str);
33940d09
JE		 3344 if (dest_node_acl)
3345 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
403edd78 3346 mutex_unlock(&dest_se_tpg->acl_node_mutex);
c66ac9db 3347
6708bb27
AG		 3348 if (!dest_node_acl) {
3349 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3350 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3351 initiator_str);
de103c93 3352 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3353 goto out;
3354 }
de103c93
CH		 3355
3356 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3357 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db 3358 " dest_node_acl\n");
33940d09 3359 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 3360 dest_node_acl = NULL;
de103c93 3361 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3362 goto out;
3363 }
8b1e1244 3364
6708bb27 3365 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3366 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3367 dest_node_acl->initiatorname);
8b1e1244 3368
c66ac9db
NB		 3369 /*
3370 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3371 * PORT IDENTIFIER.
3372 */
3373 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3374 if (!dest_se_deve) {
3375 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3376 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3377 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3378 goto out;
3379 }
3380
de103c93 3381 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3382 pr_err("core_scsi3_lunacl_depend_item() failed\n");
29a05dee 3383 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
c66ac9db 3384 dest_se_deve = NULL;
de103c93 3385 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3386 goto out;
3387 }
8b1e1244 3388
6708bb27 3389 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
f2d30680 3390 " ACL for dest_se_deve->mapped_lun: %llu\n",
c66ac9db
NB		 3391 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3392 dest_se_deve->mapped_lun);
8b1e1244 3393
c66ac9db
NB		 3394 /*
3395 * A persistent reservation needs to already existing in order to
3396 * successfully complete the REGISTER_AND_MOVE service action..
3397 */
3398 spin_lock(&dev->dev_reservation_lock);
3399 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3400 if (!pr_res_holder) {
3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3402 " currently held\n");
3403 spin_unlock(&dev->dev_reservation_lock);
de103c93 3404 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3405 goto out;
3406 }
3407 /*
3408 * The received on I_T Nexus must be the reservation holder.
3409 *
3410 * From spc4r17 section 5.7.8 Table 50 --
3411 * Register behaviors for a REGISTER AND MOVE service action
3412 */
e673dc92 3413 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
6708bb27 3414 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3415 " Nexus is not reservation holder\n");
3416 spin_unlock(&dev->dev_reservation_lock);
de103c93 3417 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3418 goto out;
3419 }
3420 /*
3421 * From spc4r17 section 5.7.8: registering and moving reservation
3422 *
3423 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3424 * action is received and the established persistent reservation is a
3425 * Write Exclusive - All Registrants type or Exclusive Access -
3426 * All Registrants type reservation, then the command shall be completed
3427 * with RESERVATION CONFLICT status.
3428 */
3429 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3430 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3431 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3432 " reservation for type: %s\n",
3433 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3434 spin_unlock(&dev->dev_reservation_lock);
de103c93 3435 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3436 goto out;
3437 }
3438 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3439 /*
3440 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3441 */
3442 type = pr_res_holder->pr_res_type;
3443 scope = pr_res_holder->pr_res_type;
3444 /*
3445 * c) Associate the reservation key specified in the SERVICE ACTION
3446 * RESERVATION KEY field with the I_T nexus specified as the
3447 * destination of the register and move, where:
3448 * A) The I_T nexus is specified by the TransportID and the
3449 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3450 * B) Regardless of the TransportID format used, the association for
3451 * the initiator port is based on either the initiator port name
3452 * (see 3.1.71) on SCSI transport protocols where port names are
3453 * required or the initiator port identifier (see 3.1.70) on SCSI
3454 * transport protocols where port names are not required;
3455 * d) Register the reservation key specified in the SERVICE ACTION
3456 * RESERVATION KEY field;
3457 * e) Retain the reservation key specified in the SERVICE ACTION
3458 * RESERVATION KEY field and associated information;
3459 *
3460 * Also, It is not an error for a REGISTER AND MOVE service action to
3461 * register an I_T nexus that is already registered with the same
3462 * reservation key or a different reservation key.
3463 */
3464 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3465 iport_ptr);
6708bb27 3466 if (!dest_pr_reg) {
79dc9c9e
NB		 3467 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3468 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
3469
80bfdfa9 3470 spin_unlock(&dev->dev_reservation_lock);
79dc9c9e
NB		 3471 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3472 dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3473 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
de103c93 3474 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3475 goto out;
3476 }
80bfdfa9 3477 spin_lock(&dev->dev_reservation_lock);
c66ac9db
NB		 3478 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3479 iport_ptr);
3480 new_reg = 1;
3481 }
3482 /*
3483 * f) Release the persistent reservation for the persistent reservation
3484 * holder (i.e., the I_T nexus on which the
3485 */
3486 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 3487 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3488 /*
3489 * g) Move the persistent reservation to the specified I_T nexus using
3490 * the same scope and type as the persistent reservation released in
3491 * item f); and
3492 */
3493 dev->dev_pr_res_holder = dest_pr_reg;
3494 dest_pr_reg->pr_res_holder = 1;
3495 dest_pr_reg->pr_res_type = type;
3496 pr_reg->pr_res_scope = scope;
d2843c17 3497 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3498 /*
3499 * Increment PRGeneration for existing registrations..
3500 */
6708bb27 3501 if (!new_reg)
c66ac9db
NB		 3502 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3503 spin_unlock(&dev->dev_reservation_lock);
3504
6708bb27 3505 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3506 " created new reservation holder TYPE: %s on object RTPI:"
3507 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3508 core_scsi3_pr_dump_type(type), rtpi,
3509 dest_pr_reg->pr_res_generation);
6708bb27 3510 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3511 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3512 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3513 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3514 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3515 iport_ptr : "");
3516 /*
3517 * It is now safe to release configfs group dependencies for destination
3518 * of Transport ID Initiator Device/Port Identifier
3519 */
3520 core_scsi3_lunacl_undepend_item(dest_se_deve);
3521 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3522 core_scsi3_tpg_undepend_item(dest_se_tpg);
3523 /*
3524 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3525 * nexus on which PERSISTENT RESERVE OUT command was received.
3526 */
3527 if (unreg) {
3528 spin_lock(&pr_tmpl->registration_lock);
3529 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3530 spin_unlock(&pr_tmpl->registration_lock);
3531 } else
3532 core_scsi3_put_pr_reg(pr_reg);
3533
459f213b 3534 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3535
4949314c 3536 transport_kunmap_data_sg(cmd);
05d1c7c0 3537
c66ac9db
NB		 3538 core_scsi3_put_pr_reg(dest_pr_reg);
3539 return 0;
3540out:
05d1c7c0 3541 if (buf)
4949314c 3542 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3543 if (dest_se_deve)
3544 core_scsi3_lunacl_undepend_item(dest_se_deve);
3545 if (dest_node_acl)
3546 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3547 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3548
3549out_put_pr_reg:
c66ac9db
NB		 3550 core_scsi3_put_pr_reg(pr_reg);
3551 return ret;
3552}
3553
3554static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3555{
3556 unsigned int __v1, __v2;
3557
3558 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3559 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3560
3561 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3562}
3563
3564/*
3565 * See spc4r17 section 6.14 Table 170
3566 */
de103c93
CH		 3567sense_reason_t
3568target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3569{
92404e60 3570 struct se_device *dev = cmd->se_dev;
617c0e06 3571 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3572 unsigned char *buf;
c66ac9db
NB		 3573 u64 res_key, sa_res_key;
3574 int sa, scope, type, aptpl;
3575 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3576 sense_reason_t ret;
617c0e06
CH		 3577
3578 /*
3579 * Following spc2r20 5.5.1 Reservations overview:
3580 *
3581 * If a logical unit has been reserved by any RESERVE command and is
3582 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3583 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3584 * initiator or service action and shall terminate with a RESERVATION
3585 * CONFLICT status.
3586 */
0fd97ccf 3587 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3588 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3589 " SPC-2 reservation is held, returning"
3590 " RESERVATION_CONFLICT\n");
de103c93 3591 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3592 }
3593
c66ac9db
NB		 3594 /*
3595 * FIXME: A NULL struct se_session pointer means an this is not coming from
3596 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3597 */
de103c93
CH		 3598 if (!cmd->se_sess)
3599 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3600
3601 if (cmd->data_length < 24) {
6708bb27 3602 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3603 " length too small: %u\n", cmd->data_length);
de103c93 3604 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3605 }
de103c93 3606
c66ac9db
NB		 3607 /*
3608 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3609 */
3610 sa = (cdb[1] & 0x1f);
3611 scope = (cdb[2] & 0xf0);
3612 type = (cdb[2] & 0x0f);
05d1c7c0 3613
4949314c 3614 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3615 if (!buf)
3616 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3617
c66ac9db
NB		 3618 /*
3619 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3620 */
3621 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3622 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3623 /*
3624 * REGISTER_AND_MOVE uses a different SA parameter list containing
3625 * SCSI TransportIDs.
3626 */
3627 if (sa != PRO_REGISTER_AND_MOVE) {
3628 spec_i_pt = (buf[20] & 0x08);
3629 all_tg_pt = (buf[20] & 0x04);
3630 aptpl = (buf[20] & 0x01);
3631 } else {
3632 aptpl = (buf[17] & 0x01);
3633 unreg = (buf[17] & 0x02);
3634 }
92404e60
NB		 3635 /*
3636 * If the backend device has been configured to force APTPL metadata
3637 * write-out, go ahead and propigate aptpl=1 down now.
3638 */
3639 if (dev->dev_attrib.force_pr_aptpl)
3640 aptpl = 1;
3641
4949314c 3642 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3643 buf = NULL;
3644
c66ac9db
NB		 3645 /*
3646 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3647 */
de103c93
CH		 3648 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3649 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3650
c66ac9db
NB		 3651 /*
3652 * From spc4r17 section 6.14:
3653 *
3654 * If the SPEC_I_PT bit is set to zero, the service action is not
3655 * REGISTER AND MOVE, and the parameter list length is not 24, then
3656 * the command shall be terminated with CHECK CONDITION status, with
3657 * the sense key set to ILLEGAL REQUEST, and the additional sense
3658 * code set to PARAMETER LIST LENGTH ERROR.
3659 */
6708bb27 3660 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3661 (cmd->data_length != 24)) {
6708bb27 3662 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3663 " list length: %u\n", cmd->data_length);
de103c93 3664 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3665 }
de103c93 3666
c66ac9db
NB		 3667 /*
3668 * (core_scsi3_emulate_pro_* function parameters
3669 * are defined by spc4r17 Table 174:
3670 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3671 */
3672 switch (sa) {
3673 case PRO_REGISTER:
d29a5b6a 3674 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3675 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3676 break;
c66ac9db 3677 case PRO_RESERVE:
d29a5b6a
CH		 3678 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3679 break;
c66ac9db 3680 case PRO_RELEASE:
d29a5b6a
CH		 3681 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3682 break;
c66ac9db 3683 case PRO_CLEAR:
d29a5b6a
CH		 3684 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3685 break;
c66ac9db 3686 case PRO_PREEMPT:
d29a5b6a 3687 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3688 res_key, sa_res_key, PREEMPT);
d29a5b6a 3689 break;
c66ac9db 3690 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3691 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3692 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3693 break;
c66ac9db 3694 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3695 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3696 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3697 break;
c66ac9db 3698 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3699 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3700 sa_res_key, aptpl, unreg);
d29a5b6a 3701 break;
c66ac9db 3702 default:
6708bb27 3703 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3704 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3705 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3706 }
3707
6bb35e00
CH		 3708 if (!ret)
3709 target_complete_cmd(cmd, GOOD);
d29a5b6a 3710 return ret;
c66ac9db
NB		 3711}
3712
3713/*
3714 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3715 *
3716 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3717 */
de103c93
CH		 3718static sense_reason_t
3719core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3720{
0fd97ccf 3721 struct se_device *dev = cmd->se_dev;
c66ac9db 3722 struct t10_pr_registration *pr_reg;
05d1c7c0 3723 unsigned char *buf;
c66ac9db
NB		 3724 u32 add_len = 0, off = 8;
3725
3726 if (cmd->data_length < 8) {
6708bb27 3727 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3728 " too small\n", cmd->data_length);
de103c93 3729 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3730 }
3731
4949314c 3732 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3733 if (!buf)
3734 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3735
0fd97ccf
CH		 3736 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3737 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3738 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3739 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3740
0fd97ccf
CH		 3741 spin_lock(&dev->t10_pr.registration_lock);
3742 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3743 pr_reg_list) {
3744 /*
3745 * Check for overflow of 8byte PRI READ_KEYS payload and
3746 * next reservation key list descriptor.
3747 */
3748 if ((add_len + 8) > (cmd->data_length - 8))
3749 break;
3750
3751 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3752 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3753 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3754 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3755 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3756 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3757 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3758 buf[off++] = (pr_reg->pr_res_key & 0xff);
3759
3760 add_len += 8;
3761 }
0fd97ccf 3762 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3763
3764 buf[4] = ((add_len >> 24) & 0xff);
3765 buf[5] = ((add_len >> 16) & 0xff);
3766 buf[6] = ((add_len >> 8) & 0xff);
3767 buf[7] = (add_len & 0xff);
3768
4949314c 3769 transport_kunmap_data_sg(cmd);
05d1c7c0 3770
c66ac9db
NB		 3771 return 0;
3772}
3773
3774/*
3775 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3776 *
3777 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3778 */
de103c93
CH		 3779static sense_reason_t
3780core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3781{
0fd97ccf 3782 struct se_device *dev = cmd->se_dev;
c66ac9db 3783 struct t10_pr_registration *pr_reg;
05d1c7c0 3784 unsigned char *buf;
c66ac9db
NB		 3785 u64 pr_res_key;
3786 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3787
3788 if (cmd->data_length < 8) {
6708bb27 3789 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3790 " too small\n", cmd->data_length);
de103c93 3791 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3792 }
3793
4949314c 3794 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3795 if (!buf)
3796 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3797
0fd97ccf
CH		 3798 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3799 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3800 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3801 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3802
0fd97ccf
CH		 3803 spin_lock(&dev->dev_reservation_lock);
3804 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3805 if (pr_reg) {
c66ac9db
NB		 3806 /*
3807 * Set the hardcoded Additional Length
3808 */
3809 buf[4] = ((add_len >> 24) & 0xff);
3810 buf[5] = ((add_len >> 16) & 0xff);
3811 buf[6] = ((add_len >> 8) & 0xff);
3812 buf[7] = (add_len & 0xff);
3813
05d1c7c0
AG		 3814 if (cmd->data_length < 22)
3815 goto err;
3816
c66ac9db
NB		 3817 /*
3818 * Set the Reservation key.
3819 *
3820 * From spc4r17, section 5.7.10:
3821 * A persistent reservation holder has its reservation key
3822 * returned in the parameter data from a PERSISTENT
3823 * RESERVE IN command with READ RESERVATION service action as
3824 * follows:
3825 * a) For a persistent reservation of the type Write Exclusive
3826 * - All Registrants or Exclusive Access ­ All Regitrants,
3827 * the reservation key shall be set to zero; or
3828 * b) For all other persistent reservation types, the
3829 * reservation key shall be set to the registered
3830 * reservation key for the I_T nexus that holds the
3831 * persistent reservation.
3832 */
3833 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3834 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3835 pr_res_key = 0;
3836 else
3837 pr_res_key = pr_reg->pr_res_key;
3838
3839 buf[8] = ((pr_res_key >> 56) & 0xff);
3840 buf[9] = ((pr_res_key >> 48) & 0xff);
3841 buf[10] = ((pr_res_key >> 40) & 0xff);
3842 buf[11] = ((pr_res_key >> 32) & 0xff);
3843 buf[12] = ((pr_res_key >> 24) & 0xff);
3844 buf[13] = ((pr_res_key >> 16) & 0xff);
3845 buf[14] = ((pr_res_key >> 8) & 0xff);
3846 buf[15] = (pr_res_key & 0xff);
3847 /*
3848 * Set the SCOPE and TYPE
3849 */
3850 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3851 (pr_reg->pr_res_type & 0x0f);
3852 }
05d1c7c0
AG		 3853
3854err:
0fd97ccf 3855 spin_unlock(&dev->dev_reservation_lock);
4949314c 3856 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3857
3858 return 0;
3859}
3860
3861/*
3862 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3863 *
3864 * See spc4r17 section 6.13.4 Table 165
3865 */
de103c93
CH		 3866static sense_reason_t
3867core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3868{
5951146d 3869 struct se_device *dev = cmd->se_dev;
0fd97ccf 3870 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3871 unsigned char *buf;
c66ac9db
NB		 3872 u16 add_len = 8; /* Hardcoded to 8. */
3873
3874 if (cmd->data_length < 6) {
6708bb27 3875 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3876 " %u too small\n", cmd->data_length);
de103c93 3877 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3878 }
3879
4949314c 3880 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3881 if (!buf)
3882 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3883
c435285d 3884 buf[0] = ((add_len >> 8) & 0xff);
c66ac9db
NB		 3885 buf[1] = (add_len & 0xff);
3886 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3887 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3888 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3889 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3890 /*
3891 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3892 * set the TMV: Task Mask Valid bit.
3893 */
3894 buf[3] |= 0x80;
3895 /*
3896 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3897 */
3898 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3899 /*
3900 * PTPL_A: Persistence across Target Power Loss Active bit
3901 */
3902 if (pr_tmpl->pr_aptpl_active)
3903 buf[3] |= 0x01;
3904 /*
3905 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3906 */
3907 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3908 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3909 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3910 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3911 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3912 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3913
4949314c 3914 transport_kunmap_data_sg(cmd);
05d1c7c0 3915
c66ac9db
NB		 3916 return 0;
3917}
3918
3919/*
3920 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3921 *
3922 * See spc4r17 section 6.13.5 Table 168 and 169
3923 */
de103c93
CH		 3924static sense_reason_t
3925core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3926{
0fd97ccf 3927 struct se_device *dev = cmd->se_dev;
c66ac9db 3928 struct se_node_acl *se_nacl;
c66ac9db
NB		 3929 struct se_portal_group *se_tpg;
3930 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3931 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3932 unsigned char *buf;
2650d71e 3933 u32 add_desc_len = 0, add_len = 0;
c66ac9db 3934 u32 off = 8; /* off into first Full Status descriptor */
d16ca7c5 3935 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
2650d71e 3936 int exp_desc_len, desc_len;
d16ca7c5 3937 bool all_reg = false;
c66ac9db
NB		 3938
3939 if (cmd->data_length < 8) {
6708bb27 3940 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3941 " too small\n", cmd->data_length);
de103c93 3942 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3943 }
3944
4949314c 3945 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3946 if (!buf)
3947 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3948
0fd97ccf
CH		 3949 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3950 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3951 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3952 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3953
d16ca7c5
NB		 3954 spin_lock(&dev->dev_reservation_lock);
3955 if (dev->dev_pr_res_holder) {
3956 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3957
3958 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3959 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3960 all_reg = true;
3961 pr_res_type = pr_holder->pr_res_type;
3962 pr_res_scope = pr_holder->pr_res_scope;
3963 }
3964 }
3965 spin_unlock(&dev->dev_reservation_lock);
3966
c66ac9db
NB		 3967 spin_lock(&pr_tmpl->registration_lock);
3968 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3969 &pr_tmpl->registration_list, pr_reg_list) {
3970
3971 se_nacl = pr_reg->pr_reg_nacl;
3972 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3973 add_desc_len = 0;
3974
33940d09 3975 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3976 spin_unlock(&pr_tmpl->registration_lock);
3977 /*
3978 * Determine expected length of $FABRIC_MOD specific
3979 * TransportID full status descriptor..
3980 */
2650d71e
CH		 3981 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3982 &format_code);
3983 if (exp_desc_len < 0 ||
3984 exp_desc_len + add_len > cmd->data_length) {
6708bb27 3985 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3986 " out of buffer: %d\n", cmd->data_length);
3987 spin_lock(&pr_tmpl->registration_lock);
33940d09 3988 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3989 break;
3990 }
3991 /*
3992 * Set RESERVATION KEY
3993 */
3994 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3995 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3996 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3997 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3998 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3999 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4000 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4001 buf[off++] = (pr_reg->pr_res_key & 0xff);
4002 off += 4; /* Skip Over Reserved area */
4003
4004 /*
4005 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4006 */
4007 if (pr_reg->pr_reg_all_tg_pt)
4008 buf[off] = 0x02;
4009 /*
4010 * The struct se_lun pointer will be present for the
4011 * reservation holder for PR_HOLDER bit.
4012 *
4013 * Also, if this registration is the reservation
d16ca7c5
NB		 4014 * holder or there is an All Registrants reservation
4015 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 4016 */
4017 if (pr_reg->pr_res_holder) {
4018 buf[off++] |= 0x01;
4019 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4020 (pr_reg->pr_res_type & 0x0f);
d16ca7c5
NB		 4021 } else if (all_reg) {
4022 buf[off++] |= 0x01;
4023 buf[off++] = (pr_res_scope & 0xf0) |
4024 (pr_res_type & 0x0f);
4025 } else {
c66ac9db 4026 off += 2;
d16ca7c5 4027 }
c66ac9db
NB		 4028
4029 off += 4; /* Skip over reserved area */
4030 /*
4031 * From spc4r17 6.3.15:
4032 *
4033 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4034 * IDENTIFIER field contains the relative port identifier (see
4035 * 3.1.120) of the target port that is part of the I_T nexus
4036 * described by this full status descriptor. If the ALL_TG_PT
4037 * bit is set to one, the contents of the RELATIVE TARGET PORT
4038 * IDENTIFIER field are not defined by this standard.
4039 */
6708bb27 4040 if (!pr_reg->pr_reg_all_tg_pt) {
79dc9c9e 4041 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
c66ac9db 4042
79dc9c9e
NB		 4043 buf[off++] = ((sep_rtpi >> 8) & 0xff);
4044 buf[off++] = (sep_rtpi & 0xff);
c66ac9db 4045 } else
35d1efe8 4046 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db 4047
2650d71e
CH		 4048 buf[off+4] = se_tpg->proto_id;
4049
c66ac9db 4050 /*
2650d71e 4051 * Now, have the $FABRIC_MOD fill in the transport ID.
c66ac9db 4052 */
2650d71e
CH		 4053 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4054 &format_code, &buf[off+4]);
c66ac9db
NB		 4055
4056 spin_lock(&pr_tmpl->registration_lock);
33940d09 4057 atomic_dec_mb(&pr_reg->pr_res_holders);
2650d71e
CH		 4058
4059 if (desc_len < 0)
4060 break;
c66ac9db
NB		 4061 /*
4062 * Set the ADDITIONAL DESCRIPTOR LENGTH
4063 */
4064 buf[off++] = ((desc_len >> 24) & 0xff);
4065 buf[off++] = ((desc_len >> 16) & 0xff);
4066 buf[off++] = ((desc_len >> 8) & 0xff);
4067 buf[off++] = (desc_len & 0xff);
4068 /*
4069 * Size of full desctipor header minus TransportID
4070 * containing $FABRIC_MOD specific) initiator device/port
4071 * WWN information.
4072 *
4073 * See spc4r17 Section 6.13.5 Table 169
4074 */
4075 add_desc_len = (24 + desc_len);
4076
4077 off += desc_len;
4078 add_len += add_desc_len;
4079 }
4080 spin_unlock(&pr_tmpl->registration_lock);
4081 /*
4082 * Set ADDITIONAL_LENGTH
4083 */
4084 buf[4] = ((add_len >> 24) & 0xff);
4085 buf[5] = ((add_len >> 16) & 0xff);
4086 buf[6] = ((add_len >> 8) & 0xff);
4087 buf[7] = (add_len & 0xff);
4088
4949314c 4089 transport_kunmap_data_sg(cmd);
05d1c7c0 4090
c66ac9db
NB		 4091 return 0;
4092}
4093
de103c93
CH		 4094sense_reason_t
4095target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4096{
de103c93 4097 sense_reason_t ret;
e76a35d6 4098
c66ac9db
NB		 4099 /*
4100 * Following spc2r20 5.5.1 Reservations overview:
4101 *
4102 * If a logical unit has been reserved by any RESERVE command and is
4103 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4104 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4105 * initiator or service action and shall terminate with a RESERVATION
4106 * CONFLICT status.
4107 */
0fd97ccf 4108 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4109 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4110 " SPC-2 reservation is held, returning"
4111 " RESERVATION_CONFLICT\n");
de103c93 4112 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4113 }
4114
617c0e06
CH		 4115 switch (cmd->t_task_cdb[1] & 0x1f) {
4116 case PRI_READ_KEYS:
d29a5b6a
CH		 4117 ret = core_scsi3_pri_read_keys(cmd);
4118 break;
617c0e06 4119 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4120 ret = core_scsi3_pri_read_reservation(cmd);
4121 break;
617c0e06 4122 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4123 ret = core_scsi3_pri_report_capabilities(cmd);
4124 break;
617c0e06 4125 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4126 ret = core_scsi3_pri_read_full_status(cmd);
4127 break;
617c0e06
CH		 4128 default:
4129 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4130 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4131 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4132 }
4133
6bb35e00
CH		 4134 if (!ret)
4135 target_complete_cmd(cmd, GOOD);
d29a5b6a 4136 return ret;
c66ac9db
NB		 4137}
4138
de103c93
CH		 4139sense_reason_t
4140target_check_reservation(struct se_cmd *cmd)
c66ac9db 4141{
d977f437 4142 struct se_device *dev = cmd->se_dev;
de103c93 4143 sense_reason_t ret;
c66ac9db 4144
d977f437
CH		 4145 if (!cmd->se_sess)
4146 return 0;
4147 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4148 return 0;
a3541703 4149 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
d977f437 4150 return 0;
c66ac9db 4151
d977f437
CH		 4152 spin_lock(&dev->dev_reservation_lock);
4153 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4154 ret = target_scsi2_reservation_check(cmd);
4155 else
4156 ret = target_scsi3_pr_reservation_check(cmd);
4157 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4158
d977f437 4159 return ret;
c66ac9db 4160}
Linux 6.x block layer and io_uring tree(s)