projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'wireless-drivers-next-for-davem-2015-03-06' of git://git.kernel.org/pub...
[deliverable/linux.git] / drivers / target / target_core_pr.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_pr.c
3 *
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
6 *
4c76251e 7 * (c) Copyright 2009-2013 Datera, Inc.
c66ac9db
NB		 8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
c66ac9db
NB		 27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/list.h>
0e9b10a9 30#include <linux/file.h>
c66ac9db
NB		 31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33#include <asm/unaligned.h>
34
35#include <target/target_core_base.h>
c4795fb2
CH		 36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
c66ac9db
NB		 38#include <target/target_core_configfs.h>
39
e26d99ae 40#include "target_core_internal.h"
c66ac9db
NB		 41#include "target_core_pr.h"
42#include "target_core_ua.h"
43
44/*
45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
46 */
47struct pr_transport_id_holder {
48 int dest_local_nexus;
49 struct t10_pr_registration *dest_pr_reg;
50 struct se_portal_group *dest_tpg;
51 struct se_node_acl *dest_node_acl;
52 struct se_dev_entry *dest_se_deve;
53 struct list_head dest_list;
54};
55
d2843c17 56void core_pr_dump_initiator_port(
c66ac9db
NB		 57 struct t10_pr_registration *pr_reg,
58 char *buf,
59 u32 size)
60{
6708bb27 61 if (!pr_reg->isid_present_at_reg)
d2843c17 62 buf[0] = '\0';
c66ac9db 63
d2843c17 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
c66ac9db
NB		 65}
66
33ce6a87
AG		 67enum register_type {
68 REGISTER,
69 REGISTER_AND_IGNORE_EXISTING_KEY,
70 REGISTER_AND_MOVE,
71};
72
73enum preempt_type {
74 PREEMPT,
75 PREEMPT_AND_ABORT,
76};
77
c66ac9db 78static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
6c3c9baa 79 struct t10_pr_registration *, int, int);
c66ac9db 80
de103c93
CH		 81static sense_reason_t
82target_scsi2_reservation_check(struct se_cmd *cmd)
c66ac9db 83{
d977f437
CH		 84 struct se_device *dev = cmd->se_dev;
85 struct se_session *sess = cmd->se_sess;
86
87 switch (cmd->t_task_cdb[0]) {
c66ac9db
NB		 88 case INQUIRY:
89 case RELEASE:
90 case RELEASE_10:
91 return 0;
92 default:
d977f437 93 break;
c66ac9db
NB		 94 }
95
d977f437 96 if (!dev->dev_reserved_node_acl || !sess)
c66ac9db
NB		 97 return 0;
98
d977f437 99 if (dev->dev_reserved_node_acl != sess->se_node_acl)
de103c93 100 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 101
102 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
103 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
de103c93 104 return TCM_RESERVATION_CONFLICT;
c66ac9db 105 }
c66ac9db 106
d977f437 107 return 0;
c66ac9db
NB		 108}
109
eacac00c
CH		 110static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
111 struct se_node_acl *, struct se_session *);
112static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
113
087a03b3 114static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
eacac00c
CH		 115{
116 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 117 struct se_device *dev = cmd->se_dev;
eacac00c 118 struct t10_pr_registration *pr_reg;
0fd97ccf 119 struct t10_reservation *pr_tmpl = &dev->t10_pr;
eacac00c
CH		 120 int conflict = 0;
121
eacac00c
CH		 122 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
123 se_sess);
124 if (pr_reg) {
125 /*
126 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
127 * behavior
128 *
129 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
130 * status, but no reservation shall be established and the
131 * persistent reservation shall not be changed, if the command
132 * is received from a) and b) below.
133 *
134 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
135 * status, but the persistent reservation shall not be released,
136 * if the command is received from a) and b)
137 *
138 * a) An I_T nexus that is a persistent reservation holder; or
139 * b) An I_T nexus that is registered if a registrants only or
140 * all registrants type persistent reservation is present.
141 *
142 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
143 * RELEASE(6) command, or RELEASE(10) command shall be processed
144 * as defined in SPC-2.
145 */
146 if (pr_reg->pr_res_holder) {
147 core_scsi3_put_pr_reg(pr_reg);
087a03b3 148 return 1;
eacac00c
CH		 149 }
150 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
151 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
152 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
153 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
154 core_scsi3_put_pr_reg(pr_reg);
087a03b3 155 return 1;
eacac00c
CH		 156 }
157 core_scsi3_put_pr_reg(pr_reg);
158 conflict = 1;
159 } else {
160 /*
161 * Following spc2r20 5.5.1 Reservations overview:
162 *
163 * If a logical unit has executed a PERSISTENT RESERVE OUT
164 * command with the REGISTER or the REGISTER AND IGNORE
165 * EXISTING KEY service action and is still registered by any
166 * initiator, all RESERVE commands and all RELEASE commands
167 * regardless of initiator shall conflict and shall terminate
168 * with a RESERVATION CONFLICT status.
169 */
170 spin_lock(&pr_tmpl->registration_lock);
171 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
172 spin_unlock(&pr_tmpl->registration_lock);
173 }
174
175 if (conflict) {
176 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
177 " while active SPC-3 registrations exist,"
178 " returning RESERVATION_CONFLICT\n");
087a03b3 179 return -EBUSY;
eacac00c
CH		 180 }
181
087a03b3 182 return 0;
eacac00c
CH		 183}
184
de103c93
CH		 185sense_reason_t
186target_scsi2_reservation_release(struct se_cmd *cmd)
c66ac9db
NB		 187{
188 struct se_device *dev = cmd->se_dev;
189 struct se_session *sess = cmd->se_sess;
609234e3 190 struct se_portal_group *tpg;
de103c93 191 int rc;
c66ac9db 192
609234e3 193 if (!sess || !sess->se_tpg)
d29a5b6a 194 goto out;
087a03b3
NB		 195 rc = target_check_scsi2_reservation_conflict(cmd);
196 if (rc == 1)
d29a5b6a 197 goto out;
de103c93
CH		 198 if (rc < 0)
199 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 200
201 spin_lock(&dev->dev_reservation_lock);
d29a5b6a
CH		 202 if (!dev->dev_reserved_node_acl || !sess)
203 goto out_unlock;
204
205 if (dev->dev_reserved_node_acl != sess->se_node_acl)
206 goto out_unlock;
c66ac9db 207
edc318d9
BK		 208 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
209 goto out_unlock;
210
c66ac9db 211 dev->dev_reserved_node_acl = NULL;
0fd97ccf
CH		 212 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
213 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
c66ac9db 214 dev->dev_res_bin_isid = 0;
0fd97ccf 215 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 216 }
609234e3 217 tpg = sess->se_tpg;
6708bb27 218 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
e3d6f909
AG		 219 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
220 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 221 sess->se_node_acl->initiatorname);
c66ac9db 222
d29a5b6a
CH		 223out_unlock:
224 spin_unlock(&dev->dev_reservation_lock);
225out:
de103c93
CH		 226 target_complete_cmd(cmd, GOOD);
227 return 0;
c66ac9db
NB		 228}
229
de103c93
CH		 230sense_reason_t
231target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 232{
233 struct se_device *dev = cmd->se_dev;
234 struct se_session *sess = cmd->se_sess;
609234e3 235 struct se_portal_group *tpg;
de103c93
CH		 236 sense_reason_t ret = 0;
237 int rc;
c66ac9db 238
a1d8b49a
AG		 239 if ((cmd->t_task_cdb[1] & 0x01) &&
240 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 241 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 242 " ILLEGAL_REQUEST\n");
de103c93 243 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 244 }
245 /*
246 * This is currently the case for target_core_mod passthrough struct se_cmd
247 * ops
248 */
609234e3 249 if (!sess || !sess->se_tpg)
d29a5b6a 250 goto out;
087a03b3
NB		 251 rc = target_check_scsi2_reservation_conflict(cmd);
252 if (rc == 1)
d29a5b6a 253 goto out;
c66ac9db 254
de103c93
CH		 255 if (rc < 0)
256 return TCM_RESERVATION_CONFLICT;
257
609234e3 258 tpg = sess->se_tpg;
c66ac9db
NB		 259 spin_lock(&dev->dev_reservation_lock);
260 if (dev->dev_reserved_node_acl &&
261 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 262 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 263 tpg->se_tpg_tfo->get_fabric_name());
6708bb27 264 pr_err("Original reserver LUN: %u %s\n",
e3d6f909 265 cmd->se_lun->unpacked_lun,
c66ac9db 266 dev->dev_reserved_node_acl->initiatorname);
6708bb27 267 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
e3d6f909 268 " from %s \n", cmd->se_lun->unpacked_lun,
c66ac9db
NB		 269 cmd->se_deve->mapped_lun,
270 sess->se_node_acl->initiatorname);
de103c93 271 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 272 goto out_unlock;
c66ac9db
NB		 273 }
274
275 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 276 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 277 if (sess->sess_bin_isid != 0) {
278 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 279 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 280 }
6708bb27 281 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
e3d6f909
AG		 282 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
283 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 284 sess->se_node_acl->initiatorname);
c66ac9db 285
d29a5b6a
CH		 286out_unlock:
287 spin_unlock(&dev->dev_reservation_lock);
288out:
6bb35e00
CH		 289 if (!ret)
290 target_complete_cmd(cmd, GOOD);
d29a5b6a 291 return ret;
c66ac9db
NB		 292}
293
c66ac9db
NB		 294
295/*
296 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
297 *
298 * This function is called by those initiator ports who are *NOT*
299 * the active PR reservation holder when a reservation is present.
300 */
301static int core_scsi3_pr_seq_non_holder(
302 struct se_cmd *cmd,
c66ac9db
NB		 303 u32 pr_reg_type)
304{
d977f437 305 unsigned char *cdb = cmd->t_task_cdb;
c66ac9db 306 struct se_dev_entry *se_deve;
e3d6f909 307 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 308 int other_cdb = 0, ignore_reg;
309 int registered_nexus = 0, ret = 1; /* Conflict by default */
310 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
311 int we = 0; /* Write Exclusive */
312 int legacy = 0; /* Act like a legacy device and return
313 * RESERVATION CONFLICT on some CDBs */
c66ac9db 314
f2083241 315 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 316 /*
317 * Determine if the registration should be ignored due to
d977f437 318 * non-matching ISIDs in target_scsi3_pr_reservation_check().
c66ac9db
NB		 319 */
320 ignore_reg = (pr_reg_type & 0x80000000);
321 if (ignore_reg)
322 pr_reg_type &= ~0x80000000;
323
324 switch (pr_reg_type) {
325 case PR_TYPE_WRITE_EXCLUSIVE:
326 we = 1;
327 case PR_TYPE_EXCLUSIVE_ACCESS:
328 /*
329 * Some commands are only allowed for the persistent reservation
330 * holder.
331 */
332 if ((se_deve->def_pr_registered) && !(ignore_reg))
333 registered_nexus = 1;
334 break;
335 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
336 we = 1;
337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
338 /*
339 * Some commands are only allowed for registered I_T Nexuses.
340 */
341 reg_only = 1;
342 if ((se_deve->def_pr_registered) && !(ignore_reg))
343 registered_nexus = 1;
344 break;
345 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
346 we = 1;
347 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
348 /*
349 * Each registered I_T Nexus is a reservation holder.
350 */
351 all_reg = 1;
352 if ((se_deve->def_pr_registered) && !(ignore_reg))
353 registered_nexus = 1;
354 break;
355 default:
e3d6f909 356 return -EINVAL;
c66ac9db
NB		 357 }
358 /*
359 * Referenced from spc4r17 table 45 for *NON* PR holder access
360 */
361 switch (cdb[0]) {
362 case SECURITY_PROTOCOL_IN:
363 if (registered_nexus)
364 return 0;
365 ret = (we) ? 0 : 1;
366 break;
367 case MODE_SENSE:
368 case MODE_SENSE_10:
369 case READ_ATTRIBUTE:
370 case READ_BUFFER:
371 case RECEIVE_DIAGNOSTIC:
372 if (legacy) {
373 ret = 1;
374 break;
375 }
376 if (registered_nexus) {
377 ret = 0;
378 break;
379 }
380 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
381 break;
382 case PERSISTENT_RESERVE_OUT:
383 /*
384 * This follows PERSISTENT_RESERVE_OUT service actions that
385 * are allowed in the presence of various reservations.
386 * See spc4r17, table 46
387 */
388 switch (cdb[1] & 0x1f) {
389 case PRO_CLEAR:
390 case PRO_PREEMPT:
391 case PRO_PREEMPT_AND_ABORT:
392 ret = (registered_nexus) ? 0 : 1;
393 break;
394 case PRO_REGISTER:
395 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
396 ret = 0;
397 break;
398 case PRO_REGISTER_AND_MOVE:
399 case PRO_RESERVE:
400 ret = 1;
401 break;
402 case PRO_RELEASE:
403 ret = (registered_nexus) ? 0 : 1;
404 break;
405 default:
6708bb27 406 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 407 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 408 return -EINVAL;
c66ac9db
NB		 409 }
410 break;
411 case RELEASE:
412 case RELEASE_10:
eacac00c 413 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 414 ret = 0;
415 break;
416 case RESERVE:
417 case RESERVE_10:
eacac00c 418 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 419 ret = 0;
420 break;
421 case TEST_UNIT_READY:
422 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
423 break;
424 case MAINTENANCE_IN:
425 switch (cdb[1] & 0x1f) {
426 case MI_MANAGEMENT_PROTOCOL_IN:
427 if (registered_nexus) {
428 ret = 0;
429 break;
430 }
431 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
432 break;
433 case MI_REPORT_SUPPORTED_OPERATION_CODES:
434 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
435 if (legacy) {
436 ret = 1;
437 break;
438 }
439 if (registered_nexus) {
440 ret = 0;
441 break;
442 }
443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
444 break;
445 case MI_REPORT_ALIASES:
446 case MI_REPORT_IDENTIFYING_INFORMATION:
447 case MI_REPORT_PRIORITY:
448 case MI_REPORT_TARGET_PGS:
449 case MI_REPORT_TIMESTAMP:
450 ret = 0; /* Allowed */
451 break;
452 default:
6708bb27 453 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 454 (cdb[1] & 0x1f));
e3d6f909 455 return -EINVAL;
c66ac9db
NB		 456 }
457 break;
458 case ACCESS_CONTROL_IN:
459 case ACCESS_CONTROL_OUT:
460 case INQUIRY:
461 case LOG_SENSE:
85686f69 462 case SERVICE_ACTION_IN_12:
c66ac9db
NB		 463 case REPORT_LUNS:
464 case REQUEST_SENSE:
6816966a 465 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 466 ret = 0; /*/ Allowed CDBs */
467 break;
468 default:
469 other_cdb = 1;
470 break;
471 }
472 /*
25985edc 473 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 474 * statement.
475 */
6708bb27 476 if (!ret && !other_cdb) {
125d0119 477 pr_debug("Allowing explicit CDB: 0x%02x for %s"
c66ac9db
NB		 478 " reservation holder\n", cdb[0],
479 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 480
c66ac9db
NB		 481 return ret;
482 }
483 /*
484 * Check if write exclusive initiator ports *NOT* holding the
485 * WRITE_EXCLUSIVE_* reservation.
486 */
ee1b1b9c 487 if (we && !registered_nexus) {
c66ac9db
NB		 488 if (cmd->data_direction == DMA_TO_DEVICE) {
489 /*
490 * Conflict for write exclusive
491 */
6708bb27 492 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 493 " %s CDB: 0x%02x to %s reservation\n",
494 transport_dump_cmd_direction(cmd),
495 se_sess->se_node_acl->initiatorname, cdb[0],
496 core_scsi3_pr_dump_type(pr_reg_type));
497 return 1;
498 } else {
499 /*
500 * Allow non WRITE CDBs for all Write Exclusive
501 * PR TYPEs to pass for registered and
502 * non-registered_nexuxes NOT holding the reservation.
503 *
504 * We only make noise for the unregisterd nexuses,
505 * as we expect registered non-reservation holding
506 * nexuses to issue CDBs.
507 */
8b1e1244 508
6708bb27 509 if (!registered_nexus) {
125d0119 510 pr_debug("Allowing implicit CDB: 0x%02x"
c66ac9db
NB		 511 " for %s reservation on unregistered"
512 " nexus\n", cdb[0],
513 core_scsi3_pr_dump_type(pr_reg_type));
514 }
8b1e1244 515
c66ac9db
NB		 516 return 0;
517 }
518 } else if ((reg_only) || (all_reg)) {
519 if (registered_nexus) {
520 /*
521 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
522 * allow commands from registered nexuses.
523 */
8b1e1244 524
125d0119 525 pr_debug("Allowing implicit CDB: 0x%02x for %s"
c66ac9db
NB		 526 " reservation\n", cdb[0],
527 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 528
c66ac9db
NB		 529 return 0;
530 }
1ecc7586
LD		 531 } else if (we && registered_nexus) {
532 /*
533 * Reads are allowed for Write Exclusive locks
534 * from all registrants.
535 */
536 if (cmd->data_direction == DMA_FROM_DEVICE) {
537 pr_debug("Allowing READ CDB: 0x%02x for %s"
538 " reservation\n", cdb[0],
539 core_scsi3_pr_dump_type(pr_reg_type));
540
541 return 0;
542 }
c66ac9db 543 }
6708bb27 544 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 545 " for %s reservation\n", transport_dump_cmd_direction(cmd),
546 (registered_nexus) ? "" : "un",
547 se_sess->se_node_acl->initiatorname, cdb[0],
548 core_scsi3_pr_dump_type(pr_reg_type));
549
550 return 1; /* Conflict by default */
551}
552
de103c93
CH		 553static sense_reason_t
554target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 555{
556 struct se_device *dev = cmd->se_dev;
557 struct se_session *sess = cmd->se_sess;
558 u32 pr_reg_type;
559
560 if (!dev->dev_pr_res_holder)
561 return 0;
562
563 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
564 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
565 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
566 goto check_nonholder;
567
568 if (dev->dev_pr_res_holder->isid_present_at_reg) {
569 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
570 sess->sess_bin_isid) {
571 pr_reg_type |= 0x80000000;
572 goto check_nonholder;
573 }
574 }
575
576 return 0;
577
578check_nonholder:
579 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
de103c93 580 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 581 return 0;
582}
583
c66ac9db
NB		 584static u32 core_scsi3_pr_generation(struct se_device *dev)
585{
c66ac9db 586 u32 prg;
0fd97ccf 587
c66ac9db
NB		 588 /*
589 * PRGeneration field shall contain the value of a 32-bit wrapping
590 * counter mainted by the device server.
591 *
592 * Note that this is done regardless of Active Persist across
593 * Target PowerLoss (APTPL)
594 *
595 * See spc4r17 section 6.3.12 READ_KEYS service action
596 */
597 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 598 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 599 spin_unlock(&dev->dev_reservation_lock);
600
601 return prg;
602}
603
c66ac9db
NB		 604static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
605 struct se_device *dev,
606 struct se_node_acl *nacl,
607 struct se_dev_entry *deve,
608 unsigned char *isid,
609 u64 sa_res_key,
610 int all_tg_pt,
611 int aptpl)
612{
c66ac9db
NB		 613 struct t10_pr_registration *pr_reg;
614
615 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 616 if (!pr_reg) {
617 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 618 return NULL;
619 }
620
c66ac9db
NB		 621 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
622 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
623 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
624 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
625 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
626 atomic_set(&pr_reg->pr_res_holders, 0);
627 pr_reg->pr_reg_nacl = nacl;
628 pr_reg->pr_reg_deve = deve;
629 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
630 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
631 pr_reg->pr_res_key = sa_res_key;
632 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
633 pr_reg->pr_reg_aptpl = aptpl;
634 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
635 /*
636 * If an ISID value for this SCSI Initiator Port exists,
637 * save it to the registration now.
638 */
639 if (isid != NULL) {
640 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
641 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
642 pr_reg->isid_present_at_reg = 1;
643 }
644
645 return pr_reg;
646}
647
648static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
649static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
650
651/*
652 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
653 * modes.
654 */
655static struct t10_pr_registration *__core_scsi3_alloc_registration(
656 struct se_device *dev,
657 struct se_node_acl *nacl,
658 struct se_dev_entry *deve,
659 unsigned char *isid,
660 u64 sa_res_key,
661 int all_tg_pt,
662 int aptpl)
663{
664 struct se_dev_entry *deve_tmp;
665 struct se_node_acl *nacl_tmp;
666 struct se_port *port, *port_tmp;
667 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
668 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
669 int ret;
670 /*
671 * Create a registration for the I_T Nexus upon which the
672 * PROUT REGISTER was received.
673 */
674 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
675 sa_res_key, all_tg_pt, aptpl);
6708bb27 676 if (!pr_reg)
c66ac9db
NB		 677 return NULL;
678 /*
679 * Return pointer to pr_reg for ALL_TG_PT=0
680 */
6708bb27 681 if (!all_tg_pt)
c66ac9db
NB		 682 return pr_reg;
683 /*
684 * Create list of matching SCSI Initiator Port registrations
685 * for ALL_TG_PT=1
686 */
687 spin_lock(&dev->se_port_lock);
688 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
33940d09 689 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 690 spin_unlock(&dev->se_port_lock);
691
692 spin_lock_bh(&port->sep_alua_lock);
693 list_for_each_entry(deve_tmp, &port->sep_alua_list,
694 alua_port_list) {
695 /*
696 * This pointer will be NULL for demo mode MappedLUNs
125d0119 697 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 698 * MappedLUN group for the SCSI Initiator Node ACL.
699 */
6708bb27 700 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 701 continue;
702
703 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
704 /*
705 * Skip the matching struct se_node_acl that is allocated
706 * above..
707 */
708 if (nacl == nacl_tmp)
709 continue;
710 /*
711 * Only perform PR registrations for target ports on
712 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
713 * arrived.
714 */
715 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
716 continue;
717 /*
718 * Look for a matching Initiator Node ACL in ASCII format
719 */
720 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
721 continue;
722
33940d09 723 atomic_inc_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 724 spin_unlock_bh(&port->sep_alua_lock);
725 /*
726 * Grab a configfs group dependency that is released
727 * for the exception path at label out: below, or upon
728 * completion of adding ALL_TG_PT=1 registrations in
729 * __core_scsi3_add_registration()
730 */
731 ret = core_scsi3_lunacl_depend_item(deve_tmp);
732 if (ret < 0) {
6708bb27 733 pr_err("core_scsi3_lunacl_depend"
c66ac9db 734 "_item() failed\n");
33940d09
JE		 735 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
736 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 737 goto out;
738 }
739 /*
740 * Located a matching SCSI Initiator Port on a different
741 * port, allocate the pr_reg_atp and attach it to the
742 * pr_reg->pr_reg_atp_list that will be processed once
743 * the original *pr_reg is processed in
744 * __core_scsi3_add_registration()
745 */
746 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
747 nacl_tmp, deve_tmp, NULL,
748 sa_res_key, all_tg_pt, aptpl);
6708bb27 749 if (!pr_reg_atp) {
33940d09
JE		 750 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
751 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 752 core_scsi3_lunacl_undepend_item(deve_tmp);
753 goto out;
754 }
755
756 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
757 &pr_reg->pr_reg_atp_list);
758 spin_lock_bh(&port->sep_alua_lock);
759 }
760 spin_unlock_bh(&port->sep_alua_lock);
761
762 spin_lock(&dev->se_port_lock);
33940d09 763 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 764 }
765 spin_unlock(&dev->se_port_lock);
766
767 return pr_reg;
768out:
769 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
770 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
771 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
772 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
773 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
774 }
775 kmem_cache_free(t10_pr_reg_cache, pr_reg);
776 return NULL;
777}
778
779int core_scsi3_alloc_aptpl_registration(
e3d6f909 780 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 781 u64 sa_res_key,
782 unsigned char *i_port,
783 unsigned char *isid,
784 u32 mapped_lun,
785 unsigned char *t_port,
786 u16 tpgt,
787 u32 target_lun,
788 int res_holder,
789 int all_tg_pt,
790 u8 type)
791{
792 struct t10_pr_registration *pr_reg;
793
6708bb27
AG		 794 if (!i_port || !t_port || !sa_res_key) {
795 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 796 return -EINVAL;
c66ac9db
NB		 797 }
798
799 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 800 if (!pr_reg) {
801 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 802 return -ENOMEM;
c66ac9db 803 }
c66ac9db
NB		 804
805 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
806 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
807 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
808 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
809 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
810 atomic_set(&pr_reg->pr_res_holders, 0);
811 pr_reg->pr_reg_nacl = NULL;
812 pr_reg->pr_reg_deve = NULL;
813 pr_reg->pr_res_mapped_lun = mapped_lun;
814 pr_reg->pr_aptpl_target_lun = target_lun;
815 pr_reg->pr_res_key = sa_res_key;
816 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
817 pr_reg->pr_reg_aptpl = 1;
818 pr_reg->pr_reg_tg_pt_lun = NULL;
819 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
820 pr_reg->pr_res_type = type;
821 /*
822 * If an ISID value had been saved in APTPL metadata for this
823 * SCSI Initiator Port, restore it now.
824 */
825 if (isid != NULL) {
826 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
827 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
828 pr_reg->isid_present_at_reg = 1;
829 }
830 /*
831 * Copy the i_port and t_port information from caller.
832 */
833 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
834 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
835 pr_reg->pr_reg_tpgt = tpgt;
836 /*
837 * Set pr_res_holder from caller, the pr_reg who is the reservation
838 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
839 * the Initiator Node LUN ACL from the fabric module is created for
840 * this registration.
841 */
842 pr_reg->pr_res_holder = res_holder;
843
844 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 845 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 846 " metadata\n", (res_holder) ? "+reservation" : "");
847 return 0;
848}
849
850static void core_scsi3_aptpl_reserve(
851 struct se_device *dev,
852 struct se_portal_group *tpg,
853 struct se_node_acl *node_acl,
854 struct t10_pr_registration *pr_reg)
855{
856 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 857
858 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 859 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 860
861 spin_lock(&dev->dev_reservation_lock);
862 dev->dev_pr_res_holder = pr_reg;
863 spin_unlock(&dev->dev_reservation_lock);
864
6708bb27 865 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 866 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 867 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 868 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
869 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 870 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 871 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 872 i_buf);
c66ac9db
NB		 873}
874
875static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 876 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 877
878static int __core_scsi3_check_aptpl_registration(
879 struct se_device *dev,
880 struct se_portal_group *tpg,
881 struct se_lun *lun,
882 u32 target_lun,
883 struct se_node_acl *nacl,
884 struct se_dev_entry *deve)
885{
886 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 887 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 888 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
889 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
890 u16 tpgt;
891
892 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
893 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
894 /*
895 * Copy Initiator Port information from struct se_node_acl
896 */
897 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
898 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 899 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
900 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 901 /*
902 * Look for the matching registrations+reservation from those
903 * created from APTPL metadata. Note that multiple registrations
904 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
905 * TransportIDs.
906 */
907 spin_lock(&pr_tmpl->aptpl_reg_lock);
908 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
909 pr_reg_aptpl_list) {
92404e60 910
6708bb27 911 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 912 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
913 !(strcmp(pr_reg->pr_tport, t_port)) &&
914 (pr_reg->pr_reg_tpgt == tpgt) &&
915 (pr_reg->pr_aptpl_target_lun == target_lun)) {
916
917 pr_reg->pr_reg_nacl = nacl;
918 pr_reg->pr_reg_deve = deve;
919 pr_reg->pr_reg_tg_pt_lun = lun;
920
921 list_del(&pr_reg->pr_reg_aptpl_list);
922 spin_unlock(&pr_tmpl->aptpl_reg_lock);
923 /*
924 * At this point all of the pointers in *pr_reg will
925 * be setup, so go ahead and add the registration.
926 */
927
928 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
929 /*
930 * If this registration is the reservation holder,
931 * make that happen now..
932 */
933 if (pr_reg->pr_res_holder)
934 core_scsi3_aptpl_reserve(dev, tpg,
935 nacl, pr_reg);
936 /*
937 * Reenable pr_aptpl_active to accept new metadata
938 * updates once the SCSI device is active again..
939 */
940 spin_lock(&pr_tmpl->aptpl_reg_lock);
941 pr_tmpl->pr_aptpl_active = 1;
942 }
943 }
944 spin_unlock(&pr_tmpl->aptpl_reg_lock);
945
946 return 0;
947}
948
949int core_scsi3_check_aptpl_registration(
950 struct se_device *dev,
951 struct se_portal_group *tpg,
952 struct se_lun *lun,
e2480563
NB		 953 struct se_node_acl *nacl,
954 u32 mapped_lun)
c66ac9db 955{
e2480563 956 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
c66ac9db 957
d977f437 958 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 959 return 0;
960
961 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
962 lun->unpacked_lun, nacl, deve);
963}
964
965static void __core_scsi3_dump_registration(
966 struct target_core_fabric_ops *tfo,
967 struct se_device *dev,
968 struct se_node_acl *nacl,
969 struct t10_pr_registration *pr_reg,
33ce6a87 970 enum register_type register_type)
c66ac9db
NB		 971{
972 struct se_portal_group *se_tpg = nacl->se_tpg;
973 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 974
975 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 976 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 977
6708bb27 978 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 979 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
980 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 981 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 982 i_buf);
6708bb27 983 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 984 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
985 tfo->tpg_get_tag(se_tpg));
6708bb27 986 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 987 " Port(s)\n", tfo->get_fabric_name(),
988 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 989 dev->transport->name);
6708bb27 990 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 991 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
992 pr_reg->pr_res_key, pr_reg->pr_res_generation,
993 pr_reg->pr_reg_aptpl);
994}
995
996/*
997 * this function can be called with struct se_device->dev_reservation_lock
998 * when register_move = 1
999 */
1000static void __core_scsi3_add_registration(
1001 struct se_device *dev,
1002 struct se_node_acl *nacl,
1003 struct t10_pr_registration *pr_reg,
33ce6a87 1004 enum register_type register_type,
c66ac9db
NB		 1005 int register_move)
1006{
c66ac9db
NB		 1007 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1008 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1009 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1010
1011 /*
1012 * Increment PRgeneration counter for struct se_device upon a successful
1013 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1014 *
1015 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1016 * action, the struct se_device->dev_reservation_lock will already be held,
1017 * so we do not call core_scsi3_pr_generation() which grabs the lock
1018 * for the REGISTER.
1019 */
1020 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1021 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1022 core_scsi3_pr_generation(dev);
1023
1024 spin_lock(&pr_tmpl->registration_lock);
1025 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1026 pr_reg->pr_reg_deve->def_pr_registered = 1;
1027
1028 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1029 spin_unlock(&pr_tmpl->registration_lock);
1030 /*
1031 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1032 */
6708bb27 1033 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1034 return;
1035 /*
1036 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1037 * allocated in __core_scsi3_alloc_registration()
1038 */
1039 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1040 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1041 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1042
1043 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1044
1045 spin_lock(&pr_tmpl->registration_lock);
1046 list_add_tail(&pr_reg_tmp->pr_reg_list,
1047 &pr_tmpl->registration_list);
1048 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1049
1050 __core_scsi3_dump_registration(tfo, dev,
1051 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1052 register_type);
1053 spin_unlock(&pr_tmpl->registration_lock);
1054 /*
1055 * Drop configfs group dependency reference from
1056 * __core_scsi3_alloc_registration()
1057 */
1058 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1059 }
1060}
1061
1062static int core_scsi3_alloc_registration(
1063 struct se_device *dev,
1064 struct se_node_acl *nacl,
1065 struct se_dev_entry *deve,
1066 unsigned char *isid,
1067 u64 sa_res_key,
1068 int all_tg_pt,
1069 int aptpl,
33ce6a87 1070 enum register_type register_type,
c66ac9db
NB		 1071 int register_move)
1072{
1073 struct t10_pr_registration *pr_reg;
1074
1075 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1076 sa_res_key, all_tg_pt, aptpl);
6708bb27 1077 if (!pr_reg)
e3d6f909 1078 return -EPERM;
c66ac9db
NB		 1079
1080 __core_scsi3_add_registration(dev, nacl, pr_reg,
1081 register_type, register_move);
1082 return 0;
1083}
1084
1085static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1086 struct se_device *dev,
1087 struct se_node_acl *nacl,
1088 unsigned char *isid)
1089{
0fd97ccf 1090 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1091 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1092 struct se_portal_group *tpg;
1093
1094 spin_lock(&pr_tmpl->registration_lock);
1095 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1096 &pr_tmpl->registration_list, pr_reg_list) {
1097 /*
1098 * First look for a matching struct se_node_acl
1099 */
1100 if (pr_reg->pr_reg_nacl != nacl)
1101 continue;
1102
1103 tpg = pr_reg->pr_reg_nacl->se_tpg;
1104 /*
1105 * If this registration does NOT contain a fabric provided
1106 * ISID, then we have found a match.
1107 */
6708bb27 1108 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1109 /*
1110 * Determine if this SCSI device server requires that
1111 * SCSI Intiatior TransportID w/ ISIDs is enforced
1112 * for fabric modules (iSCSI) requiring them.
1113 */
e3d6f909 1114 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1115 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1116 continue;
1117 }
33940d09 1118 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1119 spin_unlock(&pr_tmpl->registration_lock);
1120 return pr_reg;
1121 }
1122 /*
1123 * If the *pr_reg contains a fabric defined ISID for multi-value
1124 * SCSI Initiator Port TransportIDs, then we expect a valid
1125 * matching ISID to be provided by the local SCSI Initiator Port.
1126 */
6708bb27 1127 if (!isid)
c66ac9db
NB		 1128 continue;
1129 if (strcmp(isid, pr_reg->pr_reg_isid))
1130 continue;
1131
33940d09 1132 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1133 spin_unlock(&pr_tmpl->registration_lock);
1134 return pr_reg;
1135 }
1136 spin_unlock(&pr_tmpl->registration_lock);
1137
1138 return NULL;
1139}
1140
1141static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1142 struct se_device *dev,
1143 struct se_node_acl *nacl,
1144 struct se_session *sess)
1145{
1146 struct se_portal_group *tpg = nacl->se_tpg;
1147 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1148
e3d6f909 1149 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1150 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1151 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1152 PR_REG_ISID_LEN);
1153 isid_ptr = &buf[0];
1154 }
1155
1156 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1157}
1158
1159static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1160{
33940d09 1161 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1162}
1163
125d0119 1164static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1165 struct se_device *dev,
1166 struct t10_pr_registration *pr_reg)
1167{
1168 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1169 struct t10_pr_registration *pr_res_holder;
1170 int ret = 0;
1171
1172 spin_lock(&dev->dev_reservation_lock);
1173 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1174 if (!pr_res_holder) {
c66ac9db
NB		 1175 spin_unlock(&dev->dev_reservation_lock);
1176 return ret;
1177 }
1178 if (pr_res_holder == pr_reg) {
1179 /*
125d0119 1180 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1181 * is being released is holding the reservation.
1182 *
1183 * From spc4r17, section 5.7.11.1:
1184 *
1185 * e) If the I_T nexus is the persistent reservation holder
1186 * and the persistent reservation is not an all registrants
1187 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1188 * service action or REGISTER AND IGNORE EXISTING KEY
1189 * service action with the SERVICE ACTION RESERVATION KEY
1190 * field set to zero (see 5.7.11.3).
1191 */
6c3c9baa 1192 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
c66ac9db
NB		 1193 ret = 1;
1194 /*
1195 * For 'All Registrants' reservation types, all existing
1196 * registrations are still processed as reservation holders
1197 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1198 * reservation holder is implicitly released here.
c66ac9db
NB		 1199 */
1200 } else if (pr_reg->pr_reg_all_tg_pt &&
1201 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1202 pr_reg->pr_reg_nacl->initiatorname)) &&
1203 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1204 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1205 " UNREGISTER while existing reservation with matching"
1206 " key 0x%016Lx is present from another SCSI Initiator"
1207 " Port\n", pr_reg->pr_res_key);
e3d6f909 1208 ret = -EPERM;
c66ac9db
NB		 1209 }
1210 spin_unlock(&dev->dev_reservation_lock);
1211
1212 return ret;
1213}
1214
1215/*
e3d6f909 1216 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1217 */
1218static void __core_scsi3_free_registration(
1219 struct se_device *dev,
1220 struct t10_pr_registration *pr_reg,
1221 struct list_head *preempt_and_abort_list,
1222 int dec_holders)
1223{
1224 struct target_core_fabric_ops *tfo =
1225 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1226 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1227 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1228
1229 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1230 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 1231
1232 pr_reg->pr_reg_deve->def_pr_registered = 0;
1233 pr_reg->pr_reg_deve->pr_res_key = 0;
6c3c9baa
NB		 1234 if (!list_empty(&pr_reg->pr_reg_list))
1235 list_del(&pr_reg->pr_reg_list);
c66ac9db
NB		 1236 /*
1237 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1238 * so call core_scsi3_put_pr_reg() to decrement our reference.
1239 */
1240 if (dec_holders)
1241 core_scsi3_put_pr_reg(pr_reg);
1242 /*
1243 * Wait until all reference from any other I_T nexuses for this
1244 * *pr_reg have been released. Because list_del() is called above,
1245 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1246 * count back to zero, and we release *pr_reg.
1247 */
1248 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1249 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1250 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1251 tfo->get_fabric_name());
1252 cpu_relax();
1253 spin_lock(&pr_tmpl->registration_lock);
1254 }
1255
6708bb27 1256 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1257 " Node: %s%s\n", tfo->get_fabric_name(),
1258 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1259 i_buf);
6708bb27 1260 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1261 " Port(s)\n", tfo->get_fabric_name(),
1262 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1263 dev->transport->name);
6708bb27 1264 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1265 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1266 pr_reg->pr_res_generation);
1267
6708bb27 1268 if (!preempt_and_abort_list) {
c66ac9db
NB		 1269 pr_reg->pr_reg_deve = NULL;
1270 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1271 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1272 return;
1273 }
1274 /*
1275 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1276 * are released once the ABORT_TASK_SET has completed..
1277 */
1278 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1279}
1280
1281void core_scsi3_free_pr_reg_from_nacl(
1282 struct se_device *dev,
1283 struct se_node_acl *nacl)
1284{
0fd97ccf 1285 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1286 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
6c3c9baa 1287 bool free_reg = false;
c66ac9db
NB		 1288 /*
1289 * If the passed se_node_acl matches the reservation holder,
1290 * release the reservation.
1291 */
1292 spin_lock(&dev->dev_reservation_lock);
1293 pr_res_holder = dev->dev_pr_res_holder;
1294 if ((pr_res_holder != NULL) &&
6c3c9baa
NB		 1295 (pr_res_holder->pr_reg_nacl == nacl)) {
1296 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1297 free_reg = true;
1298 }
c66ac9db
NB		 1299 spin_unlock(&dev->dev_reservation_lock);
1300 /*
1301 * Release any registration associated with the struct se_node_acl.
1302 */
1303 spin_lock(&pr_tmpl->registration_lock);
6c3c9baa
NB		 1304 if (pr_res_holder && free_reg)
1305 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1306
c66ac9db
NB		 1307 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1308 &pr_tmpl->registration_list, pr_reg_list) {
1309
1310 if (pr_reg->pr_reg_nacl != nacl)
1311 continue;
1312
1313 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1314 }
1315 spin_unlock(&pr_tmpl->registration_lock);
1316}
1317
1318void core_scsi3_free_all_registrations(
1319 struct se_device *dev)
1320{
0fd97ccf 1321 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1322 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323
1324 spin_lock(&dev->dev_reservation_lock);
1325 pr_res_holder = dev->dev_pr_res_holder;
1326 if (pr_res_holder != NULL) {
1327 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1328 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 1329 pr_res_holder, 0, 0);
c66ac9db
NB		 1330 }
1331 spin_unlock(&dev->dev_reservation_lock);
1332
1333 spin_lock(&pr_tmpl->registration_lock);
1334 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1335 &pr_tmpl->registration_list, pr_reg_list) {
1336
1337 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1338 }
1339 spin_unlock(&pr_tmpl->registration_lock);
1340
1341 spin_lock(&pr_tmpl->aptpl_reg_lock);
1342 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1343 pr_reg_aptpl_list) {
1344 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1345 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1346 }
1347 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1348}
1349
1350static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1351{
e3d6f909 1352 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1353 &tpg->tpg_group.cg_item);
1354}
1355
1356static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1357{
e3d6f909 1358 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1359 &tpg->tpg_group.cg_item);
1360
33940d09 1361 atomic_dec_mb(&tpg->tpg_pr_ref_count);
c66ac9db
NB		 1362}
1363
1364static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1365{
1366 struct se_portal_group *tpg = nacl->se_tpg;
1367
1368 if (nacl->dynamic_node_acl)
1369 return 0;
1370
e3d6f909 1371 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1372 &nacl->acl_group.cg_item);
1373}
1374
1375static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1376{
1377 struct se_portal_group *tpg = nacl->se_tpg;
1378
1379 if (nacl->dynamic_node_acl) {
33940d09 1380 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1381 return;
1382 }
1383
e3d6f909 1384 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1385 &nacl->acl_group.cg_item);
1386
33940d09 1387 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1388}
1389
1390static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1391{
1392 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1393 struct se_node_acl *nacl;
1394 struct se_portal_group *tpg;
1395 /*
1396 * For nacl->dynamic_node_acl=1
1397 */
6708bb27 1398 if (!lun_acl)
c66ac9db
NB		 1399 return 0;
1400
1401 nacl = lun_acl->se_lun_nacl;
1402 tpg = nacl->se_tpg;
1403
e3d6f909 1404 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1405 &lun_acl->se_lun_group.cg_item);
1406}
1407
1408static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1409{
1410 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1411 struct se_node_acl *nacl;
1412 struct se_portal_group *tpg;
1413 /*
1414 * For nacl->dynamic_node_acl=1
1415 */
6708bb27 1416 if (!lun_acl) {
33940d09 1417 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1418 return;
1419 }
1420 nacl = lun_acl->se_lun_nacl;
1421 tpg = nacl->se_tpg;
1422
e3d6f909 1423 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1424 &lun_acl->se_lun_group.cg_item);
1425
33940d09 1426 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1427}
1428
de103c93
CH		 1429static sense_reason_t
1430core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1431 struct se_cmd *cmd,
1432 struct se_portal_group *tpg,
1433 unsigned char *l_isid,
1434 u64 sa_res_key,
1435 int all_tg_pt,
1436 int aptpl)
1437{
5951146d 1438 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1439 struct se_port *tmp_port;
1440 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1441 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1442 struct se_node_acl *dest_node_acl = NULL;
1443 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1444 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1445 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1446 LIST_HEAD(tid_dest_list);
c66ac9db
NB		 1447 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1448 struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1449 unsigned char *buf;
c66ac9db 1450 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
13ba564c 1451 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
de103c93 1452 sense_reason_t ret;
c66ac9db 1453 u32 tpdl, tid_len = 0;
d2843c17 1454 int dest_local_nexus;
c66ac9db
NB		 1455 u32 dest_rtpi = 0;
1456
f2083241 1457 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1458 /*
1459 * Allocate a struct pr_transport_id_holder and setup the
1460 * local_node_acl and local_se_deve pointers and add to
1461 * struct list_head tid_dest_list for add registration
1462 * processing in the loop of tid_dest_list below.
1463 */
1464 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1465 if (!tidh_new) {
1466 pr_err("Unable to allocate tidh_new\n");
de103c93 1467 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1468 }
1469 INIT_LIST_HEAD(&tidh_new->dest_list);
1470 tidh_new->dest_tpg = tpg;
1471 tidh_new->dest_node_acl = se_sess->se_node_acl;
1472 tidh_new->dest_se_deve = local_se_deve;
1473
5951146d 1474 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1475 se_sess->se_node_acl, local_se_deve, l_isid,
1476 sa_res_key, all_tg_pt, aptpl);
6708bb27 1477 if (!local_pr_reg) {
c66ac9db 1478 kfree(tidh_new);
de103c93 1479 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1480 }
1481 tidh_new->dest_pr_reg = local_pr_reg;
1482 /*
1483 * The local I_T nexus does not hold any configfs dependances,
1484 * so we set tid_h->dest_local_nexus=1 to prevent the
1485 * configfs_undepend_item() calls in the tid_dest_list loops below.
1486 */
1487 tidh_new->dest_local_nexus = 1;
1488 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1489
0d7f1299
PB		 1490 if (cmd->data_length < 28) {
1491 pr_warn("SPC-PR: Received PR OUT parameter list"
1492 " length too small: %u\n", cmd->data_length);
de103c93 1493 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1494 goto out;
1495 }
1496
4949314c 1497 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1498 if (!buf) {
1499 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1500 goto out;
1501 }
1502
c66ac9db
NB		 1503 /*
1504 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1505 * first extract TransportID Parameter Data Length, and make sure
1506 * the value matches up to the SCSI expected data transfer length.
1507 */
1508 tpdl = (buf[24] & 0xff) << 24;
1509 tpdl |= (buf[25] & 0xff) << 16;
1510 tpdl |= (buf[26] & 0xff) << 8;
1511 tpdl |= buf[27] & 0xff;
1512
1513 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1514 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1515 " does not equal CDB data_length: %u\n", tpdl,
1516 cmd->data_length);
de103c93
CH		 1517 ret = TCM_INVALID_PARAMETER_LIST;
1518 goto out_unmap;
c66ac9db
NB		 1519 }
1520 /*
1521 * Start processing the received transport IDs using the
1522 * receiving I_T Nexus portal's fabric dependent methods to
1523 * obtain the SCSI Initiator Port/Device Identifiers.
1524 */
1525 ptr = &buf[28];
1526
1527 while (tpdl > 0) {
1528 proto_ident = (ptr[0] & 0x0f);
1529 dest_tpg = NULL;
1530
1531 spin_lock(&dev->se_port_lock);
1532 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1533 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1534 if (!tmp_tpg)
c66ac9db 1535 continue;
e3d6f909 1536 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1537 if (!tmp_tf_ops)
c66ac9db 1538 continue;
6708bb27
AG		 1539 if (!tmp_tf_ops->get_fabric_proto_ident ||
1540 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1541 continue;
1542 /*
1543 * Look for the matching proto_ident provided by
1544 * the received TransportID
1545 */
1546 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1547 if (tmp_proto_ident != proto_ident)
1548 continue;
1549 dest_rtpi = tmp_port->sep_rtpi;
1550
1551 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1552 tmp_tpg, (const char *)ptr, &tid_len,
1553 &iport_ptr);
6708bb27 1554 if (!i_str)
c66ac9db
NB		 1555 continue;
1556
33940d09 1557 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
c66ac9db
NB		 1558 spin_unlock(&dev->se_port_lock);
1559
de103c93 1560 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1561 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db 1562 " for tmp_tpg\n");
33940d09 1563 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
de103c93
CH		 1564 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1565 goto out_unmap;
c66ac9db
NB		 1566 }
1567 /*
35d1efe8 1568 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1569 * from the decoded fabric module specific TransportID
1570 * at *i_str.
1571 */
28638887 1572 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1573 dest_node_acl = __core_tpg_get_initiator_node_acl(
1574 tmp_tpg, i_str);
33940d09
JE		 1575 if (dest_node_acl)
1576 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 1577 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1578
6708bb27 1579 if (!dest_node_acl) {
c66ac9db
NB		 1580 core_scsi3_tpg_undepend_item(tmp_tpg);
1581 spin_lock(&dev->se_port_lock);
1582 continue;
1583 }
1584
de103c93 1585 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1586 pr_err("configfs_depend_item() failed"
c66ac9db 1587 " for dest_node_acl->acl_group\n");
33940d09 1588 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 1589 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1590 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1591 goto out_unmap;
c66ac9db
NB		 1592 }
1593
1594 dest_tpg = tmp_tpg;
6708bb27 1595 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1596 " %s Port RTPI: %hu\n",
e3d6f909 1597 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1598 dest_node_acl->initiatorname, dest_rtpi);
1599
1600 spin_lock(&dev->se_port_lock);
1601 break;
1602 }
1603 spin_unlock(&dev->se_port_lock);
1604
6708bb27
AG		 1605 if (!dest_tpg) {
1606 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1607 " dest_tpg\n");
de103c93
CH		 1608 ret = TCM_INVALID_PARAMETER_LIST;
1609 goto out_unmap;
c66ac9db 1610 }
8b1e1244 1611
6708bb27 1612 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1613 " tid_len: %d for %s + %s\n",
e3d6f909 1614 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1615 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1616
c66ac9db 1617 if (tid_len > tpdl) {
6708bb27 1618 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1619 " %u for Transport ID: %s\n", tid_len, ptr);
1620 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1621 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1622 ret = TCM_INVALID_PARAMETER_LIST;
1623 goto out_unmap;
c66ac9db
NB		 1624 }
1625 /*
1626 * Locate the desintation struct se_dev_entry pointer for matching
1627 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1628 * Target Port.
1629 */
1630 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1631 dest_rtpi);
6708bb27
AG		 1632 if (!dest_se_deve) {
1633 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1634 " from destination RTPI: %hu\n",
e3d6f909 1635 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1636 dest_rtpi);
1637
1638 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1639 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1640 ret = TCM_INVALID_PARAMETER_LIST;
1641 goto out_unmap;
c66ac9db
NB		 1642 }
1643
de103c93 1644 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1645 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db 1646 " failed\n");
33940d09 1647 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db
NB		 1648 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1649 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1650 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1651 goto out_unmap;
c66ac9db 1652 }
8b1e1244 1653
6708bb27 1654 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1655 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1656 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1657 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1658
c66ac9db
NB		 1659 /*
1660 * Skip any TransportIDs that already have a registration for
1661 * this target port.
1662 */
1663 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1664 iport_ptr);
1665 if (pr_reg_e) {
1666 core_scsi3_put_pr_reg(pr_reg_e);
1667 core_scsi3_lunacl_undepend_item(dest_se_deve);
1668 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669 core_scsi3_tpg_undepend_item(dest_tpg);
1670 ptr += tid_len;
1671 tpdl -= tid_len;
1672 tid_len = 0;
1673 continue;
1674 }
1675 /*
1676 * Allocate a struct pr_transport_id_holder and setup
1677 * the dest_node_acl and dest_se_deve pointers for the
1678 * loop below.
1679 */
1680 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1681 GFP_KERNEL);
6708bb27
AG		 1682 if (!tidh_new) {
1683 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1684 core_scsi3_lunacl_undepend_item(dest_se_deve);
1685 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1686 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1687 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1688 goto out_unmap;
c66ac9db
NB		 1689 }
1690 INIT_LIST_HEAD(&tidh_new->dest_list);
1691 tidh_new->dest_tpg = dest_tpg;
1692 tidh_new->dest_node_acl = dest_node_acl;
1693 tidh_new->dest_se_deve = dest_se_deve;
1694
1695 /*
1696 * Allocate, but do NOT add the registration for the
1697 * TransportID referenced SCSI Initiator port. This
1698 * done because of the following from spc4r17 in section
1699 * 6.14.3 wrt SPEC_I_PT:
1700 *
1701 * "If a registration fails for any initiator port (e.g., if th
1702 * logical unit does not have enough resources available to
1703 * hold the registration information), no registrations shall be
1704 * made, and the command shall be terminated with
1705 * CHECK CONDITION status."
1706 *
1707 * That means we call __core_scsi3_alloc_registration() here,
1708 * and then call __core_scsi3_add_registration() in the
1709 * 2nd loop which will never fail.
1710 */
5951146d 1711 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1712 dest_node_acl, dest_se_deve, iport_ptr,
1713 sa_res_key, all_tg_pt, aptpl);
6708bb27 1714 if (!dest_pr_reg) {
c66ac9db
NB		 1715 core_scsi3_lunacl_undepend_item(dest_se_deve);
1716 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1717 core_scsi3_tpg_undepend_item(dest_tpg);
1718 kfree(tidh_new);
de103c93
CH		 1719 ret = TCM_INVALID_PARAMETER_LIST;
1720 goto out_unmap;
c66ac9db
NB		 1721 }
1722 tidh_new->dest_pr_reg = dest_pr_reg;
1723 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1724
1725 ptr += tid_len;
1726 tpdl -= tid_len;
1727 tid_len = 0;
1728
1729 }
05d1c7c0 1730
4949314c 1731 transport_kunmap_data_sg(cmd);
05d1c7c0 1732
c66ac9db
NB		 1733 /*
1734 * Go ahead and create a registrations from tid_dest_list for the
1735 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1736 * and dest_se_deve.
1737 *
1738 * The SA Reservation Key from the PROUT is set for the
1739 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1740 * means that the TransportID Initiator port will be
1741 * registered on all of the target ports in the SCSI target device
1742 * ALL_TG_PT=0 means the registration will only be for the
1743 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1744 * was received.
1745 */
1746 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1747 dest_tpg = tidh->dest_tpg;
1748 dest_node_acl = tidh->dest_node_acl;
1749 dest_se_deve = tidh->dest_se_deve;
1750 dest_pr_reg = tidh->dest_pr_reg;
1751 dest_local_nexus = tidh->dest_local_nexus;
1752
1753 list_del(&tidh->dest_list);
1754 kfree(tidh);
1755
1756 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1757 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1758
5951146d 1759 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1760 dest_pr_reg, 0, 0);
1761
6708bb27 1762 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1763 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1764 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
d2843c17 1765 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
c66ac9db
NB		 1766
1767 if (dest_local_nexus)
1768 continue;
1769
1770 core_scsi3_lunacl_undepend_item(dest_se_deve);
1771 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1772 core_scsi3_tpg_undepend_item(dest_tpg);
1773 }
1774
1775 return 0;
de103c93 1776out_unmap:
4949314c 1777 transport_kunmap_data_sg(cmd);
de103c93 1778out:
c66ac9db
NB		 1779 /*
1780 * For the failure case, release everything from tid_dest_list
1781 * including *dest_pr_reg and the configfs dependances..
1782 */
1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1784 dest_tpg = tidh->dest_tpg;
1785 dest_node_acl = tidh->dest_node_acl;
1786 dest_se_deve = tidh->dest_se_deve;
1787 dest_pr_reg = tidh->dest_pr_reg;
1788 dest_local_nexus = tidh->dest_local_nexus;
1789
1790 list_del(&tidh->dest_list);
1791 kfree(tidh);
1792 /*
1793 * Release any extra ALL_TG_PT=1 registrations for
1794 * the SPEC_I_PT=1 case.
1795 */
1796 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1797 &dest_pr_reg->pr_reg_atp_list,
1798 pr_reg_atp_mem_list) {
1799 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1800 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1801 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1802 }
1803
c66ac9db
NB		 1804 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1805
1806 if (dest_local_nexus)
1807 continue;
1808
1809 core_scsi3_lunacl_undepend_item(dest_se_deve);
1810 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1811 core_scsi3_tpg_undepend_item(dest_tpg);
1812 }
1813 return ret;
1814}
1815
3c8a6228 1816static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1817 struct se_device *dev,
1818 unsigned char *buf,
0607decd 1819 u32 pr_aptpl_buf_len)
c66ac9db
NB		 1820{
1821 struct se_lun *lun;
1822 struct se_portal_group *tpg;
c66ac9db
NB		 1823 struct t10_pr_registration *pr_reg;
1824 unsigned char tmp[512], isid_buf[32];
1825 ssize_t len = 0;
1826 int reg_count = 0;
3c8a6228 1827 int ret = 0;
c66ac9db 1828
3c8a6228
AG		 1829 spin_lock(&dev->dev_reservation_lock);
1830 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1831 /*
1832 * Walk the registration list..
1833 */
0fd97ccf 1834 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1835 pr_reg_list) {
1836
1837 tmp[0] = '\0';
1838 isid_buf[0] = '\0';
1839 tpg = pr_reg->pr_reg_nacl->se_tpg;
1840 lun = pr_reg->pr_reg_tg_pt_lun;
1841 /*
1842 * Write out any ISID value to APTPL metadata that was included
1843 * in the original registration.
1844 */
1845 if (pr_reg->isid_present_at_reg)
1846 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1847 pr_reg->pr_reg_isid);
1848 /*
1849 * Include special metadata if the pr_reg matches the
1850 * reservation holder.
1851 */
1852 if (dev->dev_pr_res_holder == pr_reg) {
1853 snprintf(tmp, 512, "PR_REG_START: %d"
1854 "\ninitiator_fabric=%s\n"
1855 "initiator_node=%s\n%s"
1856 "sa_res_key=%llu\n"
1857 "res_holder=1\nres_type=%02x\n"
1858 "res_scope=%02x\nres_all_tg_pt=%d\n"
1859 "mapped_lun=%u\n", reg_count,
e3d6f909 1860 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1861 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1862 pr_reg->pr_res_key, pr_reg->pr_res_type,
1863 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1864 pr_reg->pr_res_mapped_lun);
1865 } else {
1866 snprintf(tmp, 512, "PR_REG_START: %d\n"
1867 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1868 "sa_res_key=%llu\nres_holder=0\n"
1869 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1870 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1871 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1872 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1873 pr_reg->pr_res_mapped_lun);
1874 }
1875
60d645a4 1876 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1877 pr_err("Unable to update renaming APTPL metadata,"
1878 " reallocating larger buffer\n");
3c8a6228
AG		 1879 ret = -EMSGSIZE;
1880 goto out;
c66ac9db
NB		 1881 }
1882 len += sprintf(buf+len, "%s", tmp);
1883
1884 /*
1885 * Include information about the associated SCSI target port.
1886 */
1887 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1888 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1889 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1890 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1891 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1892 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1893
60d645a4 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1895 pr_err("Unable to update renaming APTPL metadata,"
1896 " reallocating larger buffer\n");
3c8a6228
AG		 1897 ret = -EMSGSIZE;
1898 goto out;
c66ac9db
NB		 1899 }
1900 len += sprintf(buf+len, "%s", tmp);
1901 reg_count++;
1902 }
c66ac9db 1903
6708bb27 1904 if (!reg_count)
c66ac9db
NB		 1905 len += sprintf(buf+len, "No Registrations or Reservations");
1906
3c8a6228
AG		 1907out:
1908 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1909 spin_unlock(&dev->dev_reservation_lock);
1910
1911 return ret;
1912}
1913
c66ac9db
NB		 1914static int __core_scsi3_write_aptpl_to_file(
1915 struct se_device *dev,
4dee96fb 1916 unsigned char *buf)
c66ac9db 1917{
0fd97ccf 1918 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1919 struct file *file;
c66ac9db
NB		 1920 int flags = O_RDWR | O_CREAT | O_TRUNC;
1921 char path[512];
4dee96fb 1922 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1923 int ret;
1924
c66ac9db
NB		 1925 memset(path, 0, 512);
1926
60d645a4 1927 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1928 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1929 " into path buffer\n");
e3d6f909 1930 return -EMSGSIZE;
c66ac9db
NB		 1931 }
1932
1933 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1934 file = filp_open(path, flags, 0600);
0e9b10a9 1935 if (IS_ERR(file)) {
6708bb27 1936 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1937 " failed\n", path);
0e9b10a9 1938 return PTR_ERR(file);
c66ac9db
NB		 1939 }
1940
4dee96fb 1941 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1942
0e9b10a9 1943 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1944
0e9b10a9 1945 if (ret < 0)
6708bb27 1946 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1947 fput(file);
c66ac9db 1948
f730f915 1949 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 1950}
1951
459f213b
AG		 1952/*
1953 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1954 * write out the updated metadata to struct file for this SCSI device.
1955 */
8a391857 1956static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 1957{
8a391857 1958 unsigned char *buf;
f161d4b4 1959 int rc, len = PR_APTPL_BUF_LEN;
de103c93 1960
459f213b
AG		 1961 if (!aptpl) {
1962 char *null_buf = "No Registrations or Reservations\n";
1963
8a391857 1964 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 1965 dev->t10_pr.pr_aptpl_active = 0;
1966 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 1967
8a391857
NB		 1968 if (rc)
1969 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 1970
8a391857
NB		 1971 return 0;
1972 }
f161d4b4
NB		 1973retry:
1974 buf = vzalloc(len);
8a391857
NB		 1975 if (!buf)
1976 return TCM_OUT_OF_RESOURCES;
1977
f161d4b4 1978 rc = core_scsi3_update_aptpl_buf(dev, buf, len);
8a391857 1979 if (rc < 0) {
f161d4b4
NB		 1980 vfree(buf);
1981 len *= 2;
1982 goto retry;
c66ac9db
NB		 1983 }
1984
8a391857
NB		 1985 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1986 if (rc != 0) {
1987 pr_err("SPC-3 PR: Could not update APTPL\n");
f161d4b4 1988 vfree(buf);
8a391857
NB		 1989 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1990 }
1991 dev->t10_pr.pr_aptpl_active = 1;
f161d4b4 1992 vfree(buf);
8a391857
NB		 1993 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1994 return 0;
c66ac9db
NB		 1995}
1996
de103c93
CH		 1997static sense_reason_t
1998core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 1999 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 2000{
e3d6f909 2001 struct se_session *se_sess = cmd->se_sess;
5951146d 2002 struct se_device *dev = cmd->se_dev;
c66ac9db 2003 struct se_dev_entry *se_deve;
e3d6f909 2004 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2005 struct se_portal_group *se_tpg;
bc118fe4 2006 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2007 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2008 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2009 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2010 int pr_holder = 0, type;
c66ac9db 2011
6708bb27
AG		 2012 if (!se_sess || !se_lun) {
2013 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2014 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2015 }
2016 se_tpg = se_sess->se_tpg;
f2083241 2017 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2018
e3d6f909 2019 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2020 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2021 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2022 PR_REG_ISID_LEN);
2023 isid_ptr = &isid_buf[0];
2024 }
2025 /*
2026 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2027 */
bc118fe4
AG		 2028 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2029 if (!pr_reg) {
c66ac9db 2030 if (res_key) {
6708bb27 2031 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2032 " for SA REGISTER, returning CONFLICT\n");
de103c93 2033 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2034 }
2035 /*
2036 * Do nothing but return GOOD status.
2037 */
6708bb27 2038 if (!sa_res_key)
03e98c9e 2039 return 0;
c66ac9db 2040
6708bb27 2041 if (!spec_i_pt) {
c66ac9db
NB		 2042 /*
2043 * Perform the Service Action REGISTER on the Initiator
2044 * Port Endpoint that the PRO was received from on the
2045 * Logical Unit of the SCSI device server.
2046 */
de103c93 2047 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2048 se_sess->se_node_acl, se_deve, isid_ptr,
2049 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2050 register_type, 0)) {
6708bb27 2051 pr_err("Unable to allocate"
c66ac9db 2052 " struct t10_pr_registration\n");
de103c93 2053 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2054 }
2055 } else {
2056 /*
2057 * Register both the Initiator port that received
2058 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2059 * TransportID from Parameter list and loop through
2060 * fabric dependent parameter list while calling
2061 * logic from of core_scsi3_alloc_registration() for
2062 * each TransportID provided SCSI Initiator Port/Device
2063 */
2064 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2065 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2066 if (ret != 0)
2067 return ret;
2068 }
c66ac9db 2069
459f213b 2070 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2071 }
2072
bc118fe4
AG		 2073 /* ok, existing registration */
2074
2075 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2076 pr_err("SPC-3 PR REGISTER: Received"
2077 " res_key: 0x%016Lx does not match"
2078 " existing SA REGISTER res_key:"
2079 " 0x%016Lx\n", res_key,
2080 pr_reg->pr_res_key);
2081 ret = TCM_RESERVATION_CONFLICT;
2082 goto out;
de103c93
CH		 2083 }
2084
2085 if (spec_i_pt) {
1f070cc2
AG		 2086 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2087 " set on a registered nexus\n");
de103c93 2088 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2089 goto out;
de103c93
CH		 2090 }
2091
2092 /*
2093 * An existing ALL_TG_PT=1 registration being released
2094 * must also set ALL_TG_PT=1 in the incoming PROUT.
2095 */
1f070cc2
AG		 2096 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2097 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2098 " registration exists, but ALL_TG_PT=1 bit not"
2099 " present in received PROUT\n");
2100 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2101 goto out;
de103c93
CH		 2102 }
2103
de103c93 2104 /*
51d9c41d 2105 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2106 */
51d9c41d
AG		 2107 if (sa_res_key) {
2108 /*
2109 * Increment PRgeneration counter for struct se_device"
2110 * upon a successful REGISTER, see spc4r17 section 6.3.2
2111 * READ_KEYS service action.
2112 */
2113 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2114 pr_reg->pr_res_key = sa_res_key;
2115 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2116 " Key for %s to: 0x%016Lx PRgeneration:"
2117 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2118 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2119 pr_reg->pr_reg_nacl->initiatorname,
2120 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2121
2122 } else {
2123 /*
2124 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2125 */
6c3c9baa
NB		 2126 type = pr_reg->pr_res_type;
2127 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2128 pr_reg);
de103c93 2129 if (pr_holder < 0) {
de103c93 2130 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2131 goto out;
c66ac9db 2132 }
de103c93
CH		 2133
2134 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2135 /*
de103c93
CH		 2136 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2137 * and matching pr_res_key.
c66ac9db 2138 */
de103c93
CH		 2139 if (pr_reg->pr_reg_all_tg_pt) {
2140 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2141 &pr_tmpl->registration_list,
2142 pr_reg_list) {
2143
2144 if (!pr_reg_p->pr_reg_all_tg_pt)
2145 continue;
2146 if (pr_reg_p->pr_res_key != res_key)
2147 continue;
2148 if (pr_reg == pr_reg_p)
2149 continue;
2150 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2151 pr_reg_p->pr_reg_nacl->initiatorname))
2152 continue;
2153
2154 __core_scsi3_free_registration(dev,
2155 pr_reg_p, NULL, 0);
c66ac9db
NB		 2156 }
2157 }
de103c93 2158
c66ac9db 2159 /*
de103c93 2160 * Release the calling I_T Nexus registration now..
c66ac9db 2161 */
de103c93 2162 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2163 pr_reg = NULL;
c66ac9db 2164
de103c93
CH		 2165 /*
2166 * From spc4r17, section 5.7.11.3 Unregistering
2167 *
2168 * If the persistent reservation is a registrants only
2169 * type, the device server shall establish a unit
2170 * attention condition for the initiator port associated
2171 * with every registered I_T nexus except for the I_T
2172 * nexus on which the PERSISTENT RESERVE OUT command was
2173 * received, with the additional sense code set to
2174 * RESERVATIONS RELEASED.
2175 */
2176 if (pr_holder &&
fc09149d
NB		 2177 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2178 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2179 list_for_each_entry(pr_reg_p,
2180 &pr_tmpl->registration_list,
2181 pr_reg_list) {
2182
2183 core_scsi3_ua_allocate(
2184 pr_reg_p->pr_reg_nacl,
2185 pr_reg_p->pr_res_mapped_lun,
2186 0x2A,
2187 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2188 }
de103c93 2189 }
c66ac9db 2190
51d9c41d 2191 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2192 }
c66ac9db 2193
459f213b 2194 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2195
bc118fe4 2196out:
fc09149d
NB		 2197 if (pr_reg)
2198 core_scsi3_put_pr_reg(pr_reg);
de103c93 2199 return ret;
c66ac9db
NB		 2200}
2201
2202unsigned char *core_scsi3_pr_dump_type(int type)
2203{
2204 switch (type) {
2205 case PR_TYPE_WRITE_EXCLUSIVE:
2206 return "Write Exclusive Access";
2207 case PR_TYPE_EXCLUSIVE_ACCESS:
2208 return "Exclusive Access";
2209 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2210 return "Write Exclusive Access, Registrants Only";
2211 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2212 return "Exclusive Access, Registrants Only";
2213 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2214 return "Write Exclusive Access, All Registrants";
2215 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2216 return "Exclusive Access, All Registrants";
2217 default:
2218 break;
2219 }
2220
2221 return "Unknown SPC-3 PR Type";
2222}
2223
de103c93
CH		 2224static sense_reason_t
2225core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2226{
de103c93 2227 struct se_device *dev = cmd->se_dev;
e3d6f909 2228 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2229 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2230 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2231 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2232 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2233 sense_reason_t ret;
c66ac9db
NB		 2234
2235 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2236
6708bb27
AG		 2237 if (!se_sess || !se_lun) {
2238 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2239 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2240 }
c66ac9db
NB		 2241 /*
2242 * Locate the existing *pr_reg via struct se_node_acl pointers
2243 */
5951146d 2244 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2245 se_sess);
6708bb27
AG		 2246 if (!pr_reg) {
2247 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2248 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2249 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2250 }
2251 /*
2252 * From spc4r17 Section 5.7.9: Reserving:
2253 *
2254 * An application client creates a persistent reservation by issuing
2255 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2256 * a registered I_T nexus with the following parameters:
2257 * a) RESERVATION KEY set to the value of the reservation key that is
2258 * registered with the logical unit for the I_T nexus; and
2259 */
2260 if (res_key != pr_reg->pr_res_key) {
6708bb27 2261 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2262 " does not match existing SA REGISTER res_key:"
2263 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2264 ret = TCM_RESERVATION_CONFLICT;
2265 goto out_put_pr_reg;
c66ac9db
NB		 2266 }
2267 /*
2268 * From spc4r17 Section 5.7.9: Reserving:
2269 *
2270 * From above:
2271 * b) TYPE field and SCOPE field set to the persistent reservation
2272 * being created.
2273 *
2274 * Only one persistent reservation is allowed at a time per logical unit
2275 * and that persistent reservation has a scope of LU_SCOPE.
2276 */
2277 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2278 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2279 ret = TCM_INVALID_PARAMETER_LIST;
2280 goto out_put_pr_reg;
c66ac9db
NB		 2281 }
2282 /*
2283 * See if we have an existing PR reservation holder pointer at
2284 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2285 * *pr_res_holder.
2286 */
2287 spin_lock(&dev->dev_reservation_lock);
2288 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2289 if (pr_res_holder) {
ae450e24 2290 int pr_res_type = pr_res_holder->pr_res_type;
c66ac9db
NB		 2291 /*
2292 * From spc4r17 Section 5.7.9: Reserving:
2293 *
2294 * If the device server receives a PERSISTENT RESERVE OUT
2295 * command from an I_T nexus other than a persistent reservation
2296 * holder (see 5.7.10) that attempts to create a persistent
2297 * reservation when a persistent reservation already exists for
2298 * the logical unit, then the command shall be completed with
2299 * RESERVATION CONFLICT status.
2300 */
ae450e24
NB		 2301 if ((pr_res_holder != pr_reg) &&
2302 (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2303 (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
c66ac9db 2304 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2305 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2306 " [%s]: %s while reservation already held by"
2307 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2308 cmd->se_tfo->get_fabric_name(),
c66ac9db 2309 se_sess->se_node_acl->initiatorname,
e3d6f909 2310 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2311 pr_res_holder->pr_reg_nacl->initiatorname);
2312
2313 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2314 ret = TCM_RESERVATION_CONFLICT;
2315 goto out_put_pr_reg;
c66ac9db
NB		 2316 }
2317 /*
2318 * From spc4r17 Section 5.7.9: Reserving:
2319 *
2320 * If a persistent reservation holder attempts to modify the
2321 * type or scope of an existing persistent reservation, the
2322 * command shall be completed with RESERVATION CONFLICT status.
2323 */
2324 if ((pr_res_holder->pr_res_type != type) ||
2325 (pr_res_holder->pr_res_scope != scope)) {
2326 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2327 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2328 " [%s]: %s trying to change TYPE and/or SCOPE,"
2329 " while reservation already held by [%s]: %s,"
2330 " returning RESERVATION_CONFLICT\n",
e3d6f909 2331 cmd->se_tfo->get_fabric_name(),
c66ac9db 2332 se_sess->se_node_acl->initiatorname,
e3d6f909 2333 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2334 pr_res_holder->pr_reg_nacl->initiatorname);
2335
2336 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2337 ret = TCM_RESERVATION_CONFLICT;
2338 goto out_put_pr_reg;
c66ac9db
NB		 2339 }
2340 /*
2341 * From spc4r17 Section 5.7.9: Reserving:
2342 *
2343 * If the device server receives a PERSISTENT RESERVE OUT
2344 * command with RESERVE service action where the TYPE field and
2345 * the SCOPE field contain the same values as the existing type
2346 * and scope from a persistent reservation holder, it shall not
2347 * make any change to the existing persistent reservation and
2348 * shall completethe command with GOOD status.
2349 */
2350 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2351 ret = 0;
2352 goto out_put_pr_reg;
c66ac9db
NB		 2353 }
2354 /*
2355 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2356 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2357 */
2358 pr_reg->pr_res_scope = scope;
2359 pr_reg->pr_res_type = type;
2360 pr_reg->pr_res_holder = 1;
2361 dev->dev_pr_res_holder = pr_reg;
d2843c17 2362 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2363
6708bb27 2364 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2365 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2366 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2367 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2368 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2369 cmd->se_tfo->get_fabric_name(),
c66ac9db 2370 se_sess->se_node_acl->initiatorname,
d2843c17 2371 i_buf);
c66ac9db
NB		 2372 spin_unlock(&dev->dev_reservation_lock);
2373
459f213b
AG		 2374 if (pr_tmpl->pr_aptpl_active)
2375 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2376
de103c93
CH		 2377 ret = 0;
2378out_put_pr_reg:
c66ac9db 2379 core_scsi3_put_pr_reg(pr_reg);
de103c93 2380 return ret;
c66ac9db
NB		 2381}
2382
de103c93
CH		 2383static sense_reason_t
2384core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2385 u64 res_key)
c66ac9db 2386{
c66ac9db
NB		 2387 switch (type) {
2388 case PR_TYPE_WRITE_EXCLUSIVE:
2389 case PR_TYPE_EXCLUSIVE_ACCESS:
2390 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2391 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2392 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2393 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2394 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2395 default:
6708bb27 2396 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2397 " 0x%02x\n", type);
de103c93 2398 return TCM_INVALID_CDB_FIELD;
c66ac9db 2399 }
c66ac9db
NB		 2400}
2401
2402/*
2403 * Called with struct se_device->dev_reservation_lock held.
2404 */
2405static void __core_scsi3_complete_pro_release(
2406 struct se_device *dev,
2407 struct se_node_acl *se_nacl,
2408 struct t10_pr_registration *pr_reg,
6c3c9baa
NB		 2409 int explicit,
2410 int unreg)
c66ac9db
NB		 2411{
2412 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2413 char i_buf[PR_REG_ISID_ID_LEN];
6c3c9baa 2414 int pr_res_type = 0, pr_res_scope = 0;
c66ac9db
NB		 2415
2416 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2417 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2418 /*
2419 * Go ahead and release the current PR reservation holder.
6c3c9baa
NB		 2420 * If an All Registrants reservation is currently active and
2421 * a unregister operation is requested, replace the current
2422 * dev_pr_res_holder with another active registration.
2423 */
2424 if (dev->dev_pr_res_holder) {
2425 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2426 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2427 dev->dev_pr_res_holder->pr_res_type = 0;
2428 dev->dev_pr_res_holder->pr_res_scope = 0;
2429 dev->dev_pr_res_holder->pr_res_holder = 0;
2430 dev->dev_pr_res_holder = NULL;
2431 }
2432 if (!unreg)
2433 goto out;
c66ac9db 2434
6c3c9baa
NB		 2435 spin_lock(&dev->t10_pr.registration_lock);
2436 list_del_init(&pr_reg->pr_reg_list);
2437 /*
2438 * If the I_T nexus is a reservation holder, the persistent reservation
2439 * is of an all registrants type, and the I_T nexus is the last remaining
2440 * registered I_T nexus, then the device server shall also release the
2441 * persistent reservation.
2442 */
2443 if (!list_empty(&dev->t10_pr.registration_list) &&
2444 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2445 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2446 dev->dev_pr_res_holder =
2447 list_entry(dev->t10_pr.registration_list.next,
2448 struct t10_pr_registration, pr_reg_list);
2449 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2450 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2451 dev->dev_pr_res_holder->pr_res_holder = 1;
2452 }
2453 spin_unlock(&dev->t10_pr.registration_lock);
2454out:
2455 if (!dev->dev_pr_res_holder) {
2456 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2457 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2458 tfo->get_fabric_name(), (explicit) ? "explicit" :
2459 "implicit", core_scsi3_pr_dump_type(pr_res_type),
2460 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2461 }
6708bb27 2462 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2463 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2464 i_buf);
c66ac9db
NB		 2465 /*
2466 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2467 */
2468 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2469}
2470
de103c93
CH		 2471static sense_reason_t
2472core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2473 u64 res_key)
c66ac9db
NB		 2474{
2475 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2476 struct se_session *se_sess = cmd->se_sess;
2477 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2478 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2479 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93
CH		 2480 int all_reg = 0;
2481 sense_reason_t ret = 0;
c66ac9db 2482
6708bb27
AG		 2483 if (!se_sess || !se_lun) {
2484 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2485 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2486 }
2487 /*
2488 * Locate the existing *pr_reg via struct se_node_acl pointers
2489 */
2490 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2491 if (!pr_reg) {
2492 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2493 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2494 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2495 }
2496 /*
2497 * From spc4r17 Section 5.7.11.2 Releasing:
2498 *
2499 * If there is no persistent reservation or in response to a persistent
2500 * reservation release request from a registered I_T nexus that is not a
2501 * persistent reservation holder (see 5.7.10), the device server shall
2502 * do the following:
2503 *
2504 * a) Not release the persistent reservation, if any;
2505 * b) Not remove any registrations; and
2506 * c) Complete the command with GOOD status.
2507 */
2508 spin_lock(&dev->dev_reservation_lock);
2509 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2510 if (!pr_res_holder) {
c66ac9db
NB		 2511 /*
2512 * No persistent reservation, return GOOD status.
2513 */
2514 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2515 goto out_put_pr_reg;
c66ac9db
NB		 2516 }
2517 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2518 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2519 all_reg = 1;
2520
2521 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2522 /*
2523 * Non 'All Registrants' PR Type cases..
2524 * Release request from a registered I_T nexus that is not a
2525 * persistent reservation holder. return GOOD status.
2526 */
2527 spin_unlock(&dev->dev_reservation_lock);
de103c93 2528 goto out_put_pr_reg;
c66ac9db 2529 }
de103c93 2530
c66ac9db
NB		 2531 /*
2532 * From spc4r17 Section 5.7.11.2 Releasing:
2533 *
2534 * Only the persistent reservation holder (see 5.7.10) is allowed to
2535 * release a persistent reservation.
2536 *
2537 * An application client releases the persistent reservation by issuing
2538 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2539 * an I_T nexus that is a persistent reservation holder with the
2540 * following parameters:
2541 *
2542 * a) RESERVATION KEY field set to the value of the reservation key
2543 * that is registered with the logical unit for the I_T nexus;
2544 */
2545 if (res_key != pr_reg->pr_res_key) {
6708bb27 2546 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2547 " does not match existing SA REGISTER res_key:"
2548 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2549 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2550 ret = TCM_RESERVATION_CONFLICT;
2551 goto out_put_pr_reg;
c66ac9db
NB		 2552 }
2553 /*
2554 * From spc4r17 Section 5.7.11.2 Releasing and above:
2555 *
2556 * b) TYPE field and SCOPE field set to match the persistent
2557 * reservation being released.
2558 */
2559 if ((pr_res_holder->pr_res_type != type) ||
2560 (pr_res_holder->pr_res_scope != scope)) {
2561 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2562 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2563 " reservation from [%s]: %s with different TYPE "
2564 "and/or SCOPE while reservation already held by"
2565 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2566 cmd->se_tfo->get_fabric_name(),
c66ac9db 2567 se_sess->se_node_acl->initiatorname,
e3d6f909 2568 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2569 pr_res_holder->pr_reg_nacl->initiatorname);
2570
2571 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2572 ret = TCM_RESERVATION_CONFLICT;
2573 goto out_put_pr_reg;
c66ac9db
NB		 2574 }
2575 /*
2576 * In response to a persistent reservation release request from the
2577 * persistent reservation holder the device server shall perform a
2578 * release by doing the following as an uninterrupted series of actions:
2579 * a) Release the persistent reservation;
2580 * b) Not remove any registration(s);
2581 * c) If the released persistent reservation is a registrants only type
2582 * or all registrants type persistent reservation,
2583 * the device server shall establish a unit attention condition for
2584 * the initiator port associated with every regis-
2585 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2586 * RESERVE OUT command with RELEASE service action was received,
2587 * with the additional sense code set to RESERVATIONS RELEASED; and
2588 * d) If the persistent reservation is of any other type, the device
2589 * server shall not establish a unit attention condition.
2590 */
2591 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
6c3c9baa 2592 pr_reg, 1, 0);
c66ac9db
NB		 2593
2594 spin_unlock(&dev->dev_reservation_lock);
2595
2596 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2597 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2598 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2599 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2600 /*
2601 * If no UNIT ATTENTION conditions will be established for
2602 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2603 * go ahead and check for APTPL=1 update+write below
2604 */
2605 goto write_aptpl;
2606 }
2607
2608 spin_lock(&pr_tmpl->registration_lock);
2609 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2610 pr_reg_list) {
2611 /*
2612 * Do not establish a UNIT ATTENTION condition
2613 * for the calling I_T Nexus
2614 */
2615 if (pr_reg_p == pr_reg)
2616 continue;
2617
2618 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2619 pr_reg_p->pr_res_mapped_lun,
2620 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2621 }
2622 spin_unlock(&pr_tmpl->registration_lock);
2623
2624write_aptpl:
459f213b
AG		 2625 if (pr_tmpl->pr_aptpl_active)
2626 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2627
de103c93 2628out_put_pr_reg:
c66ac9db 2629 core_scsi3_put_pr_reg(pr_reg);
de103c93 2630 return ret;
c66ac9db
NB		 2631}
2632
de103c93
CH		 2633static sense_reason_t
2634core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2635{
2636 struct se_device *dev = cmd->se_dev;
2637 struct se_node_acl *pr_reg_nacl;
e3d6f909 2638 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2639 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2640 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2641 u32 pr_res_mapped_lun = 0;
2642 int calling_it_nexus = 0;
2643 /*
2644 * Locate the existing *pr_reg via struct se_node_acl pointers
2645 */
5951146d 2646 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2647 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2648 if (!pr_reg_n) {
2649 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2650 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2651 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2652 }
2653 /*
2654 * From spc4r17 section 5.7.11.6, Clearing:
2655 *
2656 * Any application client may release the persistent reservation and
2657 * remove all registrations from a device server by issuing a
2658 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2659 * registered I_T nexus with the following parameter:
2660 *
2661 * a) RESERVATION KEY field set to the value of the reservation key
2662 * that is registered with the logical unit for the I_T nexus.
2663 */
2664 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2665 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2666 " res_key: 0x%016Lx does not match"
2667 " existing SA REGISTER res_key:"
2668 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2669 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2670 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2671 }
2672 /*
2673 * a) Release the persistent reservation, if any;
2674 */
2675 spin_lock(&dev->dev_reservation_lock);
2676 pr_res_holder = dev->dev_pr_res_holder;
2677 if (pr_res_holder) {
2678 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2679 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 2680 pr_res_holder, 0, 0);
c66ac9db
NB		 2681 }
2682 spin_unlock(&dev->dev_reservation_lock);
2683 /*
2684 * b) Remove all registration(s) (see spc4r17 5.7.7);
2685 */
2686 spin_lock(&pr_tmpl->registration_lock);
2687 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2688 &pr_tmpl->registration_list, pr_reg_list) {
2689
2690 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2691 pr_reg_nacl = pr_reg->pr_reg_nacl;
2692 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2693 __core_scsi3_free_registration(dev, pr_reg, NULL,
2694 calling_it_nexus);
2695 /*
2696 * e) Establish a unit attention condition for the initiator
2697 * port associated with every registered I_T nexus other
2698 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2699 * command with CLEAR service action was received, with the
2700 * additional sense code set to RESERVATIONS PREEMPTED.
2701 */
6708bb27 2702 if (!calling_it_nexus)
c66ac9db
NB		 2703 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2704 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2705 }
2706 spin_unlock(&pr_tmpl->registration_lock);
2707
6708bb27 2708 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2709 cmd->se_tfo->get_fabric_name());
c66ac9db 2710
459f213b 2711 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2712
2713 core_scsi3_pr_generation(dev);
2714 return 0;
2715}
2716
2717/*
2718 * Called with struct se_device->dev_reservation_lock held.
2719 */
2720static void __core_scsi3_complete_pro_preempt(
2721 struct se_device *dev,
2722 struct t10_pr_registration *pr_reg,
2723 struct list_head *preempt_and_abort_list,
2724 int type,
2725 int scope,
33ce6a87 2726 enum preempt_type preempt_type)
c66ac9db
NB		 2727{
2728 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2729 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2730 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2731
2732 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2733 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2734 /*
125d0119 2735 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2736 */
2737 if (dev->dev_pr_res_holder)
2738 __core_scsi3_complete_pro_release(dev, nacl,
6c3c9baa 2739 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2740
2741 dev->dev_pr_res_holder = pr_reg;
2742 pr_reg->pr_res_holder = 1;
2743 pr_reg->pr_res_type = type;
2744 pr_reg->pr_res_scope = scope;
2745
6708bb27 2746 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2747 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2748 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2749 core_scsi3_pr_dump_type(type),
2750 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2751 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2752 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2753 nacl->initiatorname, i_buf);
c66ac9db
NB		 2754 /*
2755 * For PREEMPT_AND_ABORT, add the preempting reservation's
2756 * struct t10_pr_registration to the list that will be compared
2757 * against received CDBs..
2758 */
2759 if (preempt_and_abort_list)
2760 list_add_tail(&pr_reg->pr_reg_abort_list,
2761 preempt_and_abort_list);
2762}
2763
2764static void core_scsi3_release_preempt_and_abort(
2765 struct list_head *preempt_and_abort_list,
2766 struct t10_pr_registration *pr_reg_holder)
2767{
2768 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2769
2770 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2771 pr_reg_abort_list) {
2772
2773 list_del(&pr_reg->pr_reg_abort_list);
2774 if (pr_reg_holder == pr_reg)
2775 continue;
2776 if (pr_reg->pr_res_holder) {
6708bb27 2777 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2778 continue;
2779 }
2780
2781 pr_reg->pr_reg_deve = NULL;
2782 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2783 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2784 }
2785}
2786
de103c93
CH		 2787static sense_reason_t
2788core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2789 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2790{
5951146d 2791 struct se_device *dev = cmd->se_dev;
c66ac9db 2792 struct se_node_acl *pr_reg_nacl;
e3d6f909 2793 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2794 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2795 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2796 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2797 u32 pr_res_mapped_lun = 0;
b6932ee3
SA		 2798 int all_reg = 0, calling_it_nexus = 0;
2799 bool sa_res_key_unmatched = sa_res_key != 0;
de103c93 2800 int prh_type = 0, prh_scope = 0;
c66ac9db 2801
de103c93
CH		 2802 if (!se_sess)
2803 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2804
5951146d 2805 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2806 se_sess);
6708bb27
AG		 2807 if (!pr_reg_n) {
2808 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2809 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2810 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2811 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2812 }
2813 if (pr_reg_n->pr_res_key != res_key) {
2814 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2815 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2816 }
2817 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2818 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2819 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2820 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2821 }
c66ac9db
NB		 2822
2823 spin_lock(&dev->dev_reservation_lock);
2824 pr_res_holder = dev->dev_pr_res_holder;
2825 if (pr_res_holder &&
2826 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2827 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2828 all_reg = 1;
2829
6708bb27 2830 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2831 spin_unlock(&dev->dev_reservation_lock);
2832 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2833 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2834 }
2835 /*
2836 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2837 *
2838 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2839 * persistent reservation holder or there is no persistent reservation
2840 * holder (i.e., there is no persistent reservation), then the device
2841 * server shall perform a preempt by doing the following in an
2842 * uninterrupted series of actions. (See below..)
2843 */
6708bb27 2844 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2845 /*
2846 * No existing or SA Reservation Key matching reservations..
2847 *
2848 * PROUT SA PREEMPT with All Registrant type reservations are
2849 * allowed to be processed without a matching SA Reservation Key
2850 */
2851 spin_lock(&pr_tmpl->registration_lock);
2852 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2853 &pr_tmpl->registration_list, pr_reg_list) {
2854 /*
2855 * Removing of registrations in non all registrants
2856 * type reservations without a matching SA reservation
2857 * key.
2858 *
2859 * a) Remove the registrations for all I_T nexuses
2860 * specified by the SERVICE ACTION RESERVATION KEY
2861 * field;
2862 * b) Ignore the contents of the SCOPE and TYPE fields;
2863 * c) Process tasks as defined in 5.7.1; and
2864 * d) Establish a unit attention condition for the
2865 * initiator port associated with every I_T nexus
2866 * that lost its registration other than the I_T
2867 * nexus on which the PERSISTENT RESERVE OUT command
2868 * was received, with the additional sense code set
2869 * to REGISTRATIONS PREEMPTED.
2870 */
6708bb27 2871 if (!all_reg) {
c66ac9db
NB		 2872 if (pr_reg->pr_res_key != sa_res_key)
2873 continue;
b6932ee3 2874 sa_res_key_unmatched = false;
c66ac9db
NB		 2875
2876 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2877 pr_reg_nacl = pr_reg->pr_reg_nacl;
2878 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2879 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2880 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2881 NULL, calling_it_nexus);
c66ac9db
NB		 2882 } else {
2883 /*
2884 * Case for any existing all registrants type
2885 * reservation, follow logic in spc4r17 section
2886 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2887 *
2888 * For a ZERO SA Reservation key, release
125d0119 2889 * all other registrations and do an implicit
c66ac9db
NB		 2890 * release of active persistent reservation.
2891 *
2892 * For a non-ZERO SA Reservation key, only
2893 * release the matching reservation key from
2894 * registrations.
2895 */
2896 if ((sa_res_key) &&
2897 (pr_reg->pr_res_key != sa_res_key))
2898 continue;
b6932ee3 2899 sa_res_key_unmatched = false;
c66ac9db
NB		 2900
2901 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2902 if (calling_it_nexus)
2903 continue;
2904
2905 pr_reg_nacl = pr_reg->pr_reg_nacl;
2906 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2907 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2908 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2909 NULL, 0);
c66ac9db 2910 }
6708bb27 2911 if (!calling_it_nexus)
c66ac9db
NB		 2912 core_scsi3_ua_allocate(pr_reg_nacl,
2913 pr_res_mapped_lun, 0x2A,
9e08e34e 2914 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2915 }
2916 spin_unlock(&pr_tmpl->registration_lock);
2917 /*
2918 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2919 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2920 * RESERVATION KEY field to a value that does not match any
2921 * registered reservation key, then the device server shall
2922 * complete the command with RESERVATION CONFLICT status.
2923 */
b6932ee3 2924 if (sa_res_key_unmatched) {
c66ac9db
NB		 2925 spin_unlock(&dev->dev_reservation_lock);
2926 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2927 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2928 }
2929 /*
2930 * For an existing all registrants type reservation
2931 * with a zero SA rservation key, preempt the existing
2932 * reservation with the new PR type and scope.
2933 */
2934 if (pr_res_holder && all_reg && !(sa_res_key)) {
2935 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2936 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2937 type, scope, preempt_type);
c66ac9db 2938
33ce6a87 2939 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2940 core_scsi3_release_preempt_and_abort(
2941 &preempt_and_abort_list, pr_reg_n);
2942 }
2943 spin_unlock(&dev->dev_reservation_lock);
2944
459f213b
AG		 2945 if (pr_tmpl->pr_aptpl_active)
2946 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2947
2948 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2949 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2950 return 0;
2951 }
2952 /*
2953 * The PREEMPTing SA reservation key matches that of the
2954 * existing persistent reservation, first, we check if
2955 * we are preempting our own reservation.
2956 * From spc4r17, section 5.7.11.4.3 Preempting
2957 * persistent reservations and registration handling
2958 *
2959 * If an all registrants persistent reservation is not
2960 * present, it is not an error for the persistent
2961 * reservation holder to preempt itself (i.e., a
2962 * PERSISTENT RESERVE OUT with a PREEMPT service action
2963 * or a PREEMPT AND ABORT service action with the
2964 * SERVICE ACTION RESERVATION KEY value equal to the
2965 * persistent reservation holder's reservation key that
2966 * is received from the persistent reservation holder).
2967 * In that case, the device server shall establish the
2968 * new persistent reservation and maintain the
2969 * registration.
2970 */
2971 prh_type = pr_res_holder->pr_res_type;
2972 prh_scope = pr_res_holder->pr_res_scope;
2973 /*
2974 * If the SERVICE ACTION RESERVATION KEY field identifies a
2975 * persistent reservation holder (see 5.7.10), the device
2976 * server shall perform a preempt by doing the following as
2977 * an uninterrupted series of actions:
2978 *
2979 * a) Release the persistent reservation for the holder
2980 * identified by the SERVICE ACTION RESERVATION KEY field;
2981 */
2982 if (pr_reg_n != pr_res_holder)
2983 __core_scsi3_complete_pro_release(dev,
6c3c9baa
NB		 2984 pr_res_holder->pr_reg_nacl,
2985 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2986 /*
2987 * b) Remove the registrations for all I_T nexuses identified
2988 * by the SERVICE ACTION RESERVATION KEY field, except the
2989 * I_T nexus that is being used for the PERSISTENT RESERVE
2990 * OUT command. If an all registrants persistent reservation
2991 * is present and the SERVICE ACTION RESERVATION KEY field
2992 * is set to zero, then all registrations shall be removed
2993 * except for that of the I_T nexus that is being used for
2994 * the PERSISTENT RESERVE OUT command;
2995 */
2996 spin_lock(&pr_tmpl->registration_lock);
2997 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2998 &pr_tmpl->registration_list, pr_reg_list) {
2999
3000 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3001 if (calling_it_nexus)
3002 continue;
3003
3004 if (pr_reg->pr_res_key != sa_res_key)
3005 continue;
3006
3007 pr_reg_nacl = pr_reg->pr_reg_nacl;
3008 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3009 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3010 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3011 calling_it_nexus);
3012 /*
3013 * e) Establish a unit attention condition for the initiator
3014 * port associated with every I_T nexus that lost its
3015 * persistent reservation and/or registration, with the
3016 * additional sense code set to REGISTRATIONS PREEMPTED;
3017 */
3018 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3019 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3020 }
3021 spin_unlock(&pr_tmpl->registration_lock);
3022 /*
3023 * c) Establish a persistent reservation for the preempting
3024 * I_T nexus using the contents of the SCOPE and TYPE fields;
3025 */
3026 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3027 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3028 type, scope, preempt_type);
c66ac9db
NB		 3029 /*
3030 * d) Process tasks as defined in 5.7.1;
3031 * e) See above..
3032 * f) If the type or scope has changed, then for every I_T nexus
3033 * whose reservation key was not removed, except for the I_T
3034 * nexus on which the PERSISTENT RESERVE OUT command was
3035 * received, the device server shall establish a unit
3036 * attention condition for the initiator port associated with
3037 * that I_T nexus, with the additional sense code set to
3038 * RESERVATIONS RELEASED. If the type or scope have not
3039 * changed, then no unit attention condition(s) shall be
3040 * established for this reason.
3041 */
3042 if ((prh_type != type) || (prh_scope != scope)) {
3043 spin_lock(&pr_tmpl->registration_lock);
3044 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3045 &pr_tmpl->registration_list, pr_reg_list) {
3046
3047 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3048 if (calling_it_nexus)
3049 continue;
3050
3051 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3052 pr_reg->pr_res_mapped_lun, 0x2A,
3053 ASCQ_2AH_RESERVATIONS_RELEASED);
3054 }
3055 spin_unlock(&pr_tmpl->registration_lock);
3056 }
3057 spin_unlock(&dev->dev_reservation_lock);
3058 /*
3059 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3060 * All received CDBs for the matching existing reservation and
3061 * registrations undergo ABORT_TASK logic.
3062 *
3063 * From there, core_scsi3_release_preempt_and_abort() will
3064 * release every registration in the list (which have already
3065 * been removed from the primary pr_reg list), except the
3066 * new persistent reservation holder, the calling Initiator Port.
3067 */
33ce6a87 3068 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3069 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3070 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3071 pr_reg_n);
3072 }
3073
459f213b
AG		 3074 if (pr_tmpl->pr_aptpl_active)
3075 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3076
3077 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3078 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3079 return 0;
3080}
3081
de103c93
CH		 3082static sense_reason_t
3083core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3084 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3085{
c66ac9db
NB		 3086 switch (type) {
3087 case PR_TYPE_WRITE_EXCLUSIVE:
3088 case PR_TYPE_EXCLUSIVE_ACCESS:
3089 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3090 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3091 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3092 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3093 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3094 sa_res_key, preempt_type);
c66ac9db 3095 default:
6708bb27 3096 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3097 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3098 return TCM_INVALID_CDB_FIELD;
c66ac9db 3099 }
c66ac9db
NB		 3100}
3101
3102
de103c93
CH		 3103static sense_reason_t
3104core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3105 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3106{
e3d6f909 3107 struct se_session *se_sess = cmd->se_sess;
5951146d 3108 struct se_device *dev = cmd->se_dev;
28168905 3109 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3110 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3111 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3112 struct se_port *se_port;
3113 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3114 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3115 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3116 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3117 unsigned char *buf;
c66ac9db 3118 unsigned char *initiator_str;
13ba564c 3119 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
c66ac9db 3120 u32 tid_len, tmp_tid_len;
d2843c17 3121 int new_reg = 0, type, scope, matching_iname;
de103c93 3122 sense_reason_t ret;
c66ac9db
NB		 3123 unsigned short rtpi;
3124 unsigned char proto_ident;
3125
6708bb27
AG		 3126 if (!se_sess || !se_lun) {
3127 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3128 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3129 }
de103c93 3130
c66ac9db
NB		 3131 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3132 se_tpg = se_sess->se_tpg;
e3d6f909 3133 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3134 /*
3135 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3136 * Register behaviors for a REGISTER AND MOVE service action
3137 *
3138 * Locate the existing *pr_reg via struct se_node_acl pointers
3139 */
5951146d 3140 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3141 se_sess);
6708bb27
AG		 3142 if (!pr_reg) {
3143 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3144 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3145 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3146 }
3147 /*
3148 * The provided reservation key much match the existing reservation key
3149 * provided during this initiator's I_T nexus registration.
3150 */
3151 if (res_key != pr_reg->pr_res_key) {
6708bb27 3152 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3153 " res_key: 0x%016Lx does not match existing SA REGISTER"
3154 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3155 ret = TCM_RESERVATION_CONFLICT;
3156 goto out_put_pr_reg;
c66ac9db
NB		 3157 }
3158 /*
3159 * The service active reservation key needs to be non zero
3160 */
6708bb27
AG		 3161 if (!sa_res_key) {
3162 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3163 " sa_res_key\n");
de103c93
CH		 3164 ret = TCM_INVALID_PARAMETER_LIST;
3165 goto out_put_pr_reg;
c66ac9db 3166 }
05d1c7c0 3167
c66ac9db
NB		 3168 /*
3169 * Determine the Relative Target Port Identifier where the reservation
3170 * will be moved to for the TransportID containing SCSI initiator WWN
3171 * information.
3172 */
4949314c 3173 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3174 if (!buf) {
3175 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3176 goto out_put_pr_reg;
3177 }
3178
c66ac9db
NB		 3179 rtpi = (buf[18] & 0xff) << 8;
3180 rtpi |= buf[19] & 0xff;
3181 tid_len = (buf[20] & 0xff) << 24;
3182 tid_len |= (buf[21] & 0xff) << 16;
3183 tid_len |= (buf[22] & 0xff) << 8;
3184 tid_len |= buf[23] & 0xff;
4949314c 3185 transport_kunmap_data_sg(cmd);
05d1c7c0 3186 buf = NULL;
c66ac9db
NB		 3187
3188 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3189 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3190 " does not equal CDB data_length: %u\n", tid_len,
3191 cmd->data_length);
de103c93
CH		 3192 ret = TCM_INVALID_PARAMETER_LIST;
3193 goto out_put_pr_reg;
c66ac9db
NB		 3194 }
3195
3196 spin_lock(&dev->se_port_lock);
3197 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3198 if (se_port->sep_rtpi != rtpi)
3199 continue;
3200 dest_se_tpg = se_port->sep_tpg;
6708bb27 3201 if (!dest_se_tpg)
c66ac9db 3202 continue;
e3d6f909 3203 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3204 if (!dest_tf_ops)
c66ac9db
NB		 3205 continue;
3206
33940d09 3207 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
c66ac9db
NB		 3208 spin_unlock(&dev->se_port_lock);
3209
de103c93 3210 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3211 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db 3212 " for dest_se_tpg\n");
33940d09 3213 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
de103c93
CH		 3214 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3215 goto out_put_pr_reg;
c66ac9db
NB		 3216 }
3217
3218 spin_lock(&dev->se_port_lock);
3219 break;
3220 }
3221 spin_unlock(&dev->se_port_lock);
3222
6708bb27
AG		 3223 if (!dest_se_tpg || !dest_tf_ops) {
3224 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3225 " fabric ops from Relative Target Port Identifier:"
3226 " %hu\n", rtpi);
de103c93
CH		 3227 ret = TCM_INVALID_PARAMETER_LIST;
3228 goto out_put_pr_reg;
c66ac9db 3229 }
05d1c7c0 3230
4949314c 3231 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3232 if (!buf) {
3233 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3234 goto out_put_pr_reg;
3235 }
c66ac9db 3236 proto_ident = (buf[24] & 0x0f);
8b1e1244 3237
6708bb27 3238 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3239 " 0x%02x\n", proto_ident);
8b1e1244 3240
c66ac9db 3241 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3242 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3243 " proto_ident: 0x%02x does not match ident: 0x%02x"
3244 " from fabric: %s\n", proto_ident,
3245 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3246 dest_tf_ops->get_fabric_name());
de103c93 3247 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3248 goto out;
3249 }
3250 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3251 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3252 " containg a valid tpg_parse_pr_out_transport_id"
3253 " function pointer\n");
de103c93 3254 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3255 goto out;
3256 }
3257 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3258 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3259 if (!initiator_str) {
3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3261 " initiator_str from Transport ID\n");
de103c93 3262 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3263 goto out;
3264 }
3265
4949314c 3266 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3267 buf = NULL;
3268
6708bb27 3269 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3270 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3271 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3272 iport_ptr : "");
3273 /*
3274 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3275 * action specifies a TransportID that is the same as the initiator port
3276 * of the I_T nexus for the command received, then the command shall
3277 * be terminated with CHECK CONDITION status, with the sense key set to
3278 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3279 * IN PARAMETER LIST.
3280 */
3281 pr_reg_nacl = pr_reg->pr_reg_nacl;
3282 matching_iname = (!strcmp(initiator_str,
3283 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3284 if (!matching_iname)
c66ac9db
NB		 3285 goto after_iport_check;
3286
6708bb27
AG		 3287 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3288 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3289 " matches: %s on received I_T Nexus\n", initiator_str,
3290 pr_reg_nacl->initiatorname);
de103c93 3291 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3292 goto out;
3293 }
6708bb27
AG		 3294 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3295 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3296 " matches: %s %s on received I_T Nexus\n",
3297 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3298 pr_reg->pr_reg_isid);
de103c93 3299 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3300 goto out;
3301 }
3302after_iport_check:
3303 /*
3304 * Locate the destination struct se_node_acl from the received Transport ID
3305 */
28638887 3306 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3307 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3308 initiator_str);
33940d09
JE		 3309 if (dest_node_acl)
3310 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 3311 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3312
6708bb27
AG		 3313 if (!dest_node_acl) {
3314 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3315 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3316 initiator_str);
de103c93 3317 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3318 goto out;
3319 }
de103c93
CH		 3320
3321 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3322 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db 3323 " dest_node_acl\n");
33940d09 3324 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 3325 dest_node_acl = NULL;
de103c93 3326 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3327 goto out;
3328 }
8b1e1244 3329
6708bb27 3330 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3331 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3332 dest_node_acl->initiatorname);
8b1e1244 3333
c66ac9db
NB		 3334 /*
3335 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3336 * PORT IDENTIFIER.
3337 */
3338 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3339 if (!dest_se_deve) {
3340 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3341 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3342 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3343 goto out;
3344 }
3345
de103c93 3346 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3347 pr_err("core_scsi3_lunacl_depend_item() failed\n");
33940d09 3348 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db 3349 dest_se_deve = NULL;
de103c93 3350 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3351 goto out;
3352 }
8b1e1244 3353
6708bb27 3354 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3355 " ACL for dest_se_deve->mapped_lun: %u\n",
3356 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3357 dest_se_deve->mapped_lun);
8b1e1244 3358
c66ac9db
NB		 3359 /*
3360 * A persistent reservation needs to already existing in order to
3361 * successfully complete the REGISTER_AND_MOVE service action..
3362 */
3363 spin_lock(&dev->dev_reservation_lock);
3364 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3365 if (!pr_res_holder) {
3366 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3367 " currently held\n");
3368 spin_unlock(&dev->dev_reservation_lock);
de103c93 3369 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3370 goto out;
3371 }
3372 /*
3373 * The received on I_T Nexus must be the reservation holder.
3374 *
3375 * From spc4r17 section 5.7.8 Table 50 --
3376 * Register behaviors for a REGISTER AND MOVE service action
3377 */
3378 if (pr_res_holder != pr_reg) {
6708bb27 3379 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3380 " Nexus is not reservation holder\n");
3381 spin_unlock(&dev->dev_reservation_lock);
de103c93 3382 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3383 goto out;
3384 }
3385 /*
3386 * From spc4r17 section 5.7.8: registering and moving reservation
3387 *
3388 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3389 * action is received and the established persistent reservation is a
3390 * Write Exclusive - All Registrants type or Exclusive Access -
3391 * All Registrants type reservation, then the command shall be completed
3392 * with RESERVATION CONFLICT status.
3393 */
3394 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3395 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3396 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3397 " reservation for type: %s\n",
3398 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3399 spin_unlock(&dev->dev_reservation_lock);
de103c93 3400 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3401 goto out;
3402 }
3403 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3404 /*
3405 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3406 */
3407 type = pr_res_holder->pr_res_type;
3408 scope = pr_res_holder->pr_res_type;
3409 /*
3410 * c) Associate the reservation key specified in the SERVICE ACTION
3411 * RESERVATION KEY field with the I_T nexus specified as the
3412 * destination of the register and move, where:
3413 * A) The I_T nexus is specified by the TransportID and the
3414 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3415 * B) Regardless of the TransportID format used, the association for
3416 * the initiator port is based on either the initiator port name
3417 * (see 3.1.71) on SCSI transport protocols where port names are
3418 * required or the initiator port identifier (see 3.1.70) on SCSI
3419 * transport protocols where port names are not required;
3420 * d) Register the reservation key specified in the SERVICE ACTION
3421 * RESERVATION KEY field;
3422 * e) Retain the reservation key specified in the SERVICE ACTION
3423 * RESERVATION KEY field and associated information;
3424 *
3425 * Also, It is not an error for a REGISTER AND MOVE service action to
3426 * register an I_T nexus that is already registered with the same
3427 * reservation key or a different reservation key.
3428 */
3429 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3430 iport_ptr);
6708bb27 3431 if (!dest_pr_reg) {
de103c93 3432 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3433 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3434 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3435 spin_unlock(&dev->dev_reservation_lock);
de103c93 3436 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3437 goto out;
3438 }
3439 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3440 iport_ptr);
3441 new_reg = 1;
3442 }
3443 /*
3444 * f) Release the persistent reservation for the persistent reservation
3445 * holder (i.e., the I_T nexus on which the
3446 */
3447 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 3448 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3449 /*
3450 * g) Move the persistent reservation to the specified I_T nexus using
3451 * the same scope and type as the persistent reservation released in
3452 * item f); and
3453 */
3454 dev->dev_pr_res_holder = dest_pr_reg;
3455 dest_pr_reg->pr_res_holder = 1;
3456 dest_pr_reg->pr_res_type = type;
3457 pr_reg->pr_res_scope = scope;
d2843c17 3458 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3459 /*
3460 * Increment PRGeneration for existing registrations..
3461 */
6708bb27 3462 if (!new_reg)
c66ac9db
NB		 3463 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3464 spin_unlock(&dev->dev_reservation_lock);
3465
6708bb27 3466 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3467 " created new reservation holder TYPE: %s on object RTPI:"
3468 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3469 core_scsi3_pr_dump_type(type), rtpi,
3470 dest_pr_reg->pr_res_generation);
6708bb27 3471 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3472 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3473 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3474 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3475 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3476 iport_ptr : "");
3477 /*
3478 * It is now safe to release configfs group dependencies for destination
3479 * of Transport ID Initiator Device/Port Identifier
3480 */
3481 core_scsi3_lunacl_undepend_item(dest_se_deve);
3482 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3483 core_scsi3_tpg_undepend_item(dest_se_tpg);
3484 /*
3485 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3486 * nexus on which PERSISTENT RESERVE OUT command was received.
3487 */
3488 if (unreg) {
3489 spin_lock(&pr_tmpl->registration_lock);
3490 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3491 spin_unlock(&pr_tmpl->registration_lock);
3492 } else
3493 core_scsi3_put_pr_reg(pr_reg);
3494
459f213b 3495 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3496
4949314c 3497 transport_kunmap_data_sg(cmd);
05d1c7c0 3498
c66ac9db
NB		 3499 core_scsi3_put_pr_reg(dest_pr_reg);
3500 return 0;
3501out:
05d1c7c0 3502 if (buf)
4949314c 3503 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3504 if (dest_se_deve)
3505 core_scsi3_lunacl_undepend_item(dest_se_deve);
3506 if (dest_node_acl)
3507 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3508 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3509
3510out_put_pr_reg:
c66ac9db
NB		 3511 core_scsi3_put_pr_reg(pr_reg);
3512 return ret;
3513}
3514
3515static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3516{
3517 unsigned int __v1, __v2;
3518
3519 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3520 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3521
3522 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3523}
3524
3525/*
3526 * See spc4r17 section 6.14 Table 170
3527 */
de103c93
CH		 3528sense_reason_t
3529target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3530{
92404e60 3531 struct se_device *dev = cmd->se_dev;
617c0e06 3532 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3533 unsigned char *buf;
c66ac9db
NB		 3534 u64 res_key, sa_res_key;
3535 int sa, scope, type, aptpl;
3536 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3537 sense_reason_t ret;
617c0e06
CH		 3538
3539 /*
3540 * Following spc2r20 5.5.1 Reservations overview:
3541 *
3542 * If a logical unit has been reserved by any RESERVE command and is
3543 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3544 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3545 * initiator or service action and shall terminate with a RESERVATION
3546 * CONFLICT status.
3547 */
0fd97ccf 3548 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3549 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3550 " SPC-2 reservation is held, returning"
3551 " RESERVATION_CONFLICT\n");
de103c93 3552 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3553 }
3554
c66ac9db
NB		 3555 /*
3556 * FIXME: A NULL struct se_session pointer means an this is not coming from
3557 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3558 */
de103c93
CH		 3559 if (!cmd->se_sess)
3560 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3561
3562 if (cmd->data_length < 24) {
6708bb27 3563 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3564 " length too small: %u\n", cmd->data_length);
de103c93 3565 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3566 }
de103c93 3567
c66ac9db
NB		 3568 /*
3569 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3570 */
3571 sa = (cdb[1] & 0x1f);
3572 scope = (cdb[2] & 0xf0);
3573 type = (cdb[2] & 0x0f);
05d1c7c0 3574
4949314c 3575 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3576 if (!buf)
3577 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3578
c66ac9db
NB		 3579 /*
3580 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3581 */
3582 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3583 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3584 /*
3585 * REGISTER_AND_MOVE uses a different SA parameter list containing
3586 * SCSI TransportIDs.
3587 */
3588 if (sa != PRO_REGISTER_AND_MOVE) {
3589 spec_i_pt = (buf[20] & 0x08);
3590 all_tg_pt = (buf[20] & 0x04);
3591 aptpl = (buf[20] & 0x01);
3592 } else {
3593 aptpl = (buf[17] & 0x01);
3594 unreg = (buf[17] & 0x02);
3595 }
92404e60
NB		 3596 /*
3597 * If the backend device has been configured to force APTPL metadata
3598 * write-out, go ahead and propigate aptpl=1 down now.
3599 */
3600 if (dev->dev_attrib.force_pr_aptpl)
3601 aptpl = 1;
3602
4949314c 3603 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3604 buf = NULL;
3605
c66ac9db
NB		 3606 /*
3607 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3608 */
de103c93
CH		 3609 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3610 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3611
c66ac9db
NB		 3612 /*
3613 * From spc4r17 section 6.14:
3614 *
3615 * If the SPEC_I_PT bit is set to zero, the service action is not
3616 * REGISTER AND MOVE, and the parameter list length is not 24, then
3617 * the command shall be terminated with CHECK CONDITION status, with
3618 * the sense key set to ILLEGAL REQUEST, and the additional sense
3619 * code set to PARAMETER LIST LENGTH ERROR.
3620 */
6708bb27 3621 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3622 (cmd->data_length != 24)) {
6708bb27 3623 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3624 " list length: %u\n", cmd->data_length);
de103c93 3625 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3626 }
de103c93 3627
c66ac9db
NB		 3628 /*
3629 * (core_scsi3_emulate_pro_* function parameters
3630 * are defined by spc4r17 Table 174:
3631 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3632 */
3633 switch (sa) {
3634 case PRO_REGISTER:
d29a5b6a 3635 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3636 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3637 break;
c66ac9db 3638 case PRO_RESERVE:
d29a5b6a
CH		 3639 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3640 break;
c66ac9db 3641 case PRO_RELEASE:
d29a5b6a
CH		 3642 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3643 break;
c66ac9db 3644 case PRO_CLEAR:
d29a5b6a
CH		 3645 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3646 break;
c66ac9db 3647 case PRO_PREEMPT:
d29a5b6a 3648 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3649 res_key, sa_res_key, PREEMPT);
d29a5b6a 3650 break;
c66ac9db 3651 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3652 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3653 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3654 break;
c66ac9db 3655 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3656 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3657 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3658 break;
c66ac9db 3659 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3660 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3661 sa_res_key, aptpl, unreg);
d29a5b6a 3662 break;
c66ac9db 3663 default:
6708bb27 3664 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3665 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3666 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3667 }
3668
6bb35e00
CH		 3669 if (!ret)
3670 target_complete_cmd(cmd, GOOD);
d29a5b6a 3671 return ret;
c66ac9db
NB		 3672}
3673
3674/*
3675 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3676 *
3677 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3678 */
de103c93
CH		 3679static sense_reason_t
3680core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3681{
0fd97ccf 3682 struct se_device *dev = cmd->se_dev;
c66ac9db 3683 struct t10_pr_registration *pr_reg;
05d1c7c0 3684 unsigned char *buf;
c66ac9db
NB		 3685 u32 add_len = 0, off = 8;
3686
3687 if (cmd->data_length < 8) {
6708bb27 3688 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3689 " too small\n", cmd->data_length);
de103c93 3690 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3691 }
3692
4949314c 3693 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3694 if (!buf)
3695 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3696
0fd97ccf
CH		 3697 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3698 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3699 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3700 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3701
0fd97ccf
CH		 3702 spin_lock(&dev->t10_pr.registration_lock);
3703 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3704 pr_reg_list) {
3705 /*
3706 * Check for overflow of 8byte PRI READ_KEYS payload and
3707 * next reservation key list descriptor.
3708 */
3709 if ((add_len + 8) > (cmd->data_length - 8))
3710 break;
3711
3712 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3713 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3714 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3715 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3716 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3717 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3718 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3719 buf[off++] = (pr_reg->pr_res_key & 0xff);
3720
3721 add_len += 8;
3722 }
0fd97ccf 3723 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3724
3725 buf[4] = ((add_len >> 24) & 0xff);
3726 buf[5] = ((add_len >> 16) & 0xff);
3727 buf[6] = ((add_len >> 8) & 0xff);
3728 buf[7] = (add_len & 0xff);
3729
4949314c 3730 transport_kunmap_data_sg(cmd);
05d1c7c0 3731
c66ac9db
NB		 3732 return 0;
3733}
3734
3735/*
3736 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3737 *
3738 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3739 */
de103c93
CH		 3740static sense_reason_t
3741core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3742{
0fd97ccf 3743 struct se_device *dev = cmd->se_dev;
c66ac9db 3744 struct t10_pr_registration *pr_reg;
05d1c7c0 3745 unsigned char *buf;
c66ac9db
NB		 3746 u64 pr_res_key;
3747 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3748
3749 if (cmd->data_length < 8) {
6708bb27 3750 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3751 " too small\n", cmd->data_length);
de103c93 3752 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3753 }
3754
4949314c 3755 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3756 if (!buf)
3757 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3758
0fd97ccf
CH		 3759 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3760 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3761 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3762 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3763
0fd97ccf
CH		 3764 spin_lock(&dev->dev_reservation_lock);
3765 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3766 if (pr_reg) {
c66ac9db
NB		 3767 /*
3768 * Set the hardcoded Additional Length
3769 */
3770 buf[4] = ((add_len >> 24) & 0xff);
3771 buf[5] = ((add_len >> 16) & 0xff);
3772 buf[6] = ((add_len >> 8) & 0xff);
3773 buf[7] = (add_len & 0xff);
3774
05d1c7c0
AG		 3775 if (cmd->data_length < 22)
3776 goto err;
3777
c66ac9db
NB		 3778 /*
3779 * Set the Reservation key.
3780 *
3781 * From spc4r17, section 5.7.10:
3782 * A persistent reservation holder has its reservation key
3783 * returned in the parameter data from a PERSISTENT
3784 * RESERVE IN command with READ RESERVATION service action as
3785 * follows:
3786 * a) For a persistent reservation of the type Write Exclusive
3787 * - All Registrants or Exclusive Access ­ All Regitrants,
3788 * the reservation key shall be set to zero; or
3789 * b) For all other persistent reservation types, the
3790 * reservation key shall be set to the registered
3791 * reservation key for the I_T nexus that holds the
3792 * persistent reservation.
3793 */
3794 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3795 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3796 pr_res_key = 0;
3797 else
3798 pr_res_key = pr_reg->pr_res_key;
3799
3800 buf[8] = ((pr_res_key >> 56) & 0xff);
3801 buf[9] = ((pr_res_key >> 48) & 0xff);
3802 buf[10] = ((pr_res_key >> 40) & 0xff);
3803 buf[11] = ((pr_res_key >> 32) & 0xff);
3804 buf[12] = ((pr_res_key >> 24) & 0xff);
3805 buf[13] = ((pr_res_key >> 16) & 0xff);
3806 buf[14] = ((pr_res_key >> 8) & 0xff);
3807 buf[15] = (pr_res_key & 0xff);
3808 /*
3809 * Set the SCOPE and TYPE
3810 */
3811 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3812 (pr_reg->pr_res_type & 0x0f);
3813 }
05d1c7c0
AG		 3814
3815err:
0fd97ccf 3816 spin_unlock(&dev->dev_reservation_lock);
4949314c 3817 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3818
3819 return 0;
3820}
3821
3822/*
3823 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3824 *
3825 * See spc4r17 section 6.13.4 Table 165
3826 */
de103c93
CH		 3827static sense_reason_t
3828core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3829{
5951146d 3830 struct se_device *dev = cmd->se_dev;
0fd97ccf 3831 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3832 unsigned char *buf;
c66ac9db
NB		 3833 u16 add_len = 8; /* Hardcoded to 8. */
3834
3835 if (cmd->data_length < 6) {
6708bb27 3836 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3837 " %u too small\n", cmd->data_length);
de103c93 3838 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3839 }
3840
4949314c 3841 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3842 if (!buf)
3843 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3844
c435285d 3845 buf[0] = ((add_len >> 8) & 0xff);
c66ac9db
NB		 3846 buf[1] = (add_len & 0xff);
3847 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3848 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3849 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3850 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3851 /*
3852 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3853 * set the TMV: Task Mask Valid bit.
3854 */
3855 buf[3] |= 0x80;
3856 /*
3857 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3858 */
3859 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3860 /*
3861 * PTPL_A: Persistence across Target Power Loss Active bit
3862 */
3863 if (pr_tmpl->pr_aptpl_active)
3864 buf[3] |= 0x01;
3865 /*
3866 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3867 */
3868 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3869 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3870 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3871 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3872 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3873 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3874
4949314c 3875 transport_kunmap_data_sg(cmd);
05d1c7c0 3876
c66ac9db
NB		 3877 return 0;
3878}
3879
3880/*
3881 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3882 *
3883 * See spc4r17 section 6.13.5 Table 168 and 169
3884 */
de103c93
CH		 3885static sense_reason_t
3886core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3887{
0fd97ccf 3888 struct se_device *dev = cmd->se_dev;
c66ac9db 3889 struct se_node_acl *se_nacl;
c66ac9db
NB		 3890 struct se_portal_group *se_tpg;
3891 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3892 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3893 unsigned char *buf;
c66ac9db
NB		 3894 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3895 u32 off = 8; /* off into first Full Status descriptor */
d16ca7c5
NB		 3896 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3897 bool all_reg = false;
c66ac9db
NB		 3898
3899 if (cmd->data_length < 8) {
6708bb27 3900 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3901 " too small\n", cmd->data_length);
de103c93 3902 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3903 }
3904
4949314c 3905 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3906 if (!buf)
3907 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3908
0fd97ccf
CH		 3909 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3910 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3911 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3912 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3913
d16ca7c5
NB		 3914 spin_lock(&dev->dev_reservation_lock);
3915 if (dev->dev_pr_res_holder) {
3916 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3917
3918 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3919 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3920 all_reg = true;
3921 pr_res_type = pr_holder->pr_res_type;
3922 pr_res_scope = pr_holder->pr_res_scope;
3923 }
3924 }
3925 spin_unlock(&dev->dev_reservation_lock);
3926
c66ac9db
NB		 3927 spin_lock(&pr_tmpl->registration_lock);
3928 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3929 &pr_tmpl->registration_list, pr_reg_list) {
3930
3931 se_nacl = pr_reg->pr_reg_nacl;
3932 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3933 add_desc_len = 0;
3934
33940d09 3935 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3936 spin_unlock(&pr_tmpl->registration_lock);
3937 /*
3938 * Determine expected length of $FABRIC_MOD specific
3939 * TransportID full status descriptor..
3940 */
e3d6f909 3941 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 3942 se_tpg, se_nacl, pr_reg, &format_code);
3943
3944 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 3945 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3946 " out of buffer: %d\n", cmd->data_length);
3947 spin_lock(&pr_tmpl->registration_lock);
33940d09 3948 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3949 break;
3950 }
3951 /*
3952 * Set RESERVATION KEY
3953 */
3954 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3955 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3956 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3957 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3958 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3959 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3960 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3961 buf[off++] = (pr_reg->pr_res_key & 0xff);
3962 off += 4; /* Skip Over Reserved area */
3963
3964 /*
3965 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3966 */
3967 if (pr_reg->pr_reg_all_tg_pt)
3968 buf[off] = 0x02;
3969 /*
3970 * The struct se_lun pointer will be present for the
3971 * reservation holder for PR_HOLDER bit.
3972 *
3973 * Also, if this registration is the reservation
d16ca7c5
NB		 3974 * holder or there is an All Registrants reservation
3975 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 3976 */
3977 if (pr_reg->pr_res_holder) {
3978 buf[off++] |= 0x01;
3979 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3980 (pr_reg->pr_res_type & 0x0f);
d16ca7c5
NB		 3981 } else if (all_reg) {
3982 buf[off++] |= 0x01;
3983 buf[off++] = (pr_res_scope & 0xf0) |
3984 (pr_res_type & 0x0f);
3985 } else {
c66ac9db 3986 off += 2;
d16ca7c5 3987 }
c66ac9db
NB		 3988
3989 off += 4; /* Skip over reserved area */
3990 /*
3991 * From spc4r17 6.3.15:
3992 *
3993 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3994 * IDENTIFIER field contains the relative port identifier (see
3995 * 3.1.120) of the target port that is part of the I_T nexus
3996 * described by this full status descriptor. If the ALL_TG_PT
3997 * bit is set to one, the contents of the RELATIVE TARGET PORT
3998 * IDENTIFIER field are not defined by this standard.
3999 */
6708bb27 4000 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 4001 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4002
4003 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4004 buf[off++] = (port->sep_rtpi & 0xff);
4005 } else
35d1efe8 4006 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 4007
4008 /*
4009 * Now, have the $FABRIC_MOD fill in the protocol identifier
4010 */
e3d6f909 4011 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 4012 se_nacl, pr_reg, &format_code, &buf[off+4]);
4013
4014 spin_lock(&pr_tmpl->registration_lock);
33940d09 4015 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 4016 /*
4017 * Set the ADDITIONAL DESCRIPTOR LENGTH
4018 */
4019 buf[off++] = ((desc_len >> 24) & 0xff);
4020 buf[off++] = ((desc_len >> 16) & 0xff);
4021 buf[off++] = ((desc_len >> 8) & 0xff);
4022 buf[off++] = (desc_len & 0xff);
4023 /*
4024 * Size of full desctipor header minus TransportID
4025 * containing $FABRIC_MOD specific) initiator device/port
4026 * WWN information.
4027 *
4028 * See spc4r17 Section 6.13.5 Table 169
4029 */
4030 add_desc_len = (24 + desc_len);
4031
4032 off += desc_len;
4033 add_len += add_desc_len;
4034 }
4035 spin_unlock(&pr_tmpl->registration_lock);
4036 /*
4037 * Set ADDITIONAL_LENGTH
4038 */
4039 buf[4] = ((add_len >> 24) & 0xff);
4040 buf[5] = ((add_len >> 16) & 0xff);
4041 buf[6] = ((add_len >> 8) & 0xff);
4042 buf[7] = (add_len & 0xff);
4043
4949314c 4044 transport_kunmap_data_sg(cmd);
05d1c7c0 4045
c66ac9db
NB		 4046 return 0;
4047}
4048
de103c93
CH		 4049sense_reason_t
4050target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4051{
de103c93 4052 sense_reason_t ret;
e76a35d6 4053
c66ac9db
NB		 4054 /*
4055 * Following spc2r20 5.5.1 Reservations overview:
4056 *
4057 * If a logical unit has been reserved by any RESERVE command and is
4058 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4059 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4060 * initiator or service action and shall terminate with a RESERVATION
4061 * CONFLICT status.
4062 */
0fd97ccf 4063 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4064 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4065 " SPC-2 reservation is held, returning"
4066 " RESERVATION_CONFLICT\n");
de103c93 4067 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4068 }
4069
617c0e06
CH		 4070 switch (cmd->t_task_cdb[1] & 0x1f) {
4071 case PRI_READ_KEYS:
d29a5b6a
CH		 4072 ret = core_scsi3_pri_read_keys(cmd);
4073 break;
617c0e06 4074 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4075 ret = core_scsi3_pri_read_reservation(cmd);
4076 break;
617c0e06 4077 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4078 ret = core_scsi3_pri_report_capabilities(cmd);
4079 break;
617c0e06 4080 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4081 ret = core_scsi3_pri_read_full_status(cmd);
4082 break;
617c0e06
CH		 4083 default:
4084 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4085 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4086 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4087 }
4088
6bb35e00
CH		 4089 if (!ret)
4090 target_complete_cmd(cmd, GOOD);
d29a5b6a 4091 return ret;
c66ac9db
NB		 4092}
4093
de103c93
CH		 4094sense_reason_t
4095target_check_reservation(struct se_cmd *cmd)
c66ac9db 4096{
d977f437 4097 struct se_device *dev = cmd->se_dev;
de103c93 4098 sense_reason_t ret;
c66ac9db 4099
d977f437
CH		 4100 if (!cmd->se_sess)
4101 return 0;
4102 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4103 return 0;
4104 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4105 return 0;
c66ac9db 4106
d977f437
CH		 4107 spin_lock(&dev->dev_reservation_lock);
4108 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4109 ret = target_scsi2_reservation_check(cmd);
4110 else
4111 ret = target_scsi3_pr_reservation_check(cmd);
4112 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4113
d977f437 4114 return ret;
c66ac9db 4115}
Linux kernel - Deliverables
This page took 0.631003 seconds and 5 git commands to generate.