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arch: Mass conversion of smp_mb__*()
[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
NB		 78static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
79 struct t10_pr_registration *, int);
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:
462 case READ_MEDIA_SERIAL_NUMBER:
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 }
531 }
6708bb27 532 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 533 " for %s reservation\n", transport_dump_cmd_direction(cmd),
534 (registered_nexus) ? "" : "un",
535 se_sess->se_node_acl->initiatorname, cdb[0],
536 core_scsi3_pr_dump_type(pr_reg_type));
537
538 return 1; /* Conflict by default */
539}
540
de103c93
CH		 541static sense_reason_t
542target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 543{
544 struct se_device *dev = cmd->se_dev;
545 struct se_session *sess = cmd->se_sess;
546 u32 pr_reg_type;
547
548 if (!dev->dev_pr_res_holder)
549 return 0;
550
551 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
552 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
553 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
554 goto check_nonholder;
555
556 if (dev->dev_pr_res_holder->isid_present_at_reg) {
557 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
558 sess->sess_bin_isid) {
559 pr_reg_type |= 0x80000000;
560 goto check_nonholder;
561 }
562 }
563
564 return 0;
565
566check_nonholder:
567 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
de103c93 568 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 569 return 0;
570}
571
c66ac9db
NB		 572static u32 core_scsi3_pr_generation(struct se_device *dev)
573{
c66ac9db 574 u32 prg;
0fd97ccf 575
c66ac9db
NB		 576 /*
577 * PRGeneration field shall contain the value of a 32-bit wrapping
578 * counter mainted by the device server.
579 *
580 * Note that this is done regardless of Active Persist across
581 * Target PowerLoss (APTPL)
582 *
583 * See spc4r17 section 6.3.12 READ_KEYS service action
584 */
585 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 586 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 587 spin_unlock(&dev->dev_reservation_lock);
588
589 return prg;
590}
591
c66ac9db
NB		 592static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
593 struct se_device *dev,
594 struct se_node_acl *nacl,
595 struct se_dev_entry *deve,
596 unsigned char *isid,
597 u64 sa_res_key,
598 int all_tg_pt,
599 int aptpl)
600{
c66ac9db
NB		 601 struct t10_pr_registration *pr_reg;
602
603 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 604 if (!pr_reg) {
605 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 606 return NULL;
607 }
608
c66ac9db
NB		 609 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
610 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
611 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
612 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
613 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
614 atomic_set(&pr_reg->pr_res_holders, 0);
615 pr_reg->pr_reg_nacl = nacl;
616 pr_reg->pr_reg_deve = deve;
617 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
618 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
619 pr_reg->pr_res_key = sa_res_key;
620 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
621 pr_reg->pr_reg_aptpl = aptpl;
622 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
623 /*
624 * If an ISID value for this SCSI Initiator Port exists,
625 * save it to the registration now.
626 */
627 if (isid != NULL) {
628 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
629 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
630 pr_reg->isid_present_at_reg = 1;
631 }
632
633 return pr_reg;
634}
635
636static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
637static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
638
639/*
640 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
641 * modes.
642 */
643static struct t10_pr_registration *__core_scsi3_alloc_registration(
644 struct se_device *dev,
645 struct se_node_acl *nacl,
646 struct se_dev_entry *deve,
647 unsigned char *isid,
648 u64 sa_res_key,
649 int all_tg_pt,
650 int aptpl)
651{
652 struct se_dev_entry *deve_tmp;
653 struct se_node_acl *nacl_tmp;
654 struct se_port *port, *port_tmp;
655 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
656 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
657 int ret;
658 /*
659 * Create a registration for the I_T Nexus upon which the
660 * PROUT REGISTER was received.
661 */
662 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
663 sa_res_key, all_tg_pt, aptpl);
6708bb27 664 if (!pr_reg)
c66ac9db
NB		 665 return NULL;
666 /*
667 * Return pointer to pr_reg for ALL_TG_PT=0
668 */
6708bb27 669 if (!all_tg_pt)
c66ac9db
NB		 670 return pr_reg;
671 /*
672 * Create list of matching SCSI Initiator Port registrations
673 * for ALL_TG_PT=1
674 */
675 spin_lock(&dev->se_port_lock);
676 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
677 atomic_inc(&port->sep_tg_pt_ref_cnt);
4e857c58 678 smp_mb__after_atomic();
c66ac9db
NB		 679 spin_unlock(&dev->se_port_lock);
680
681 spin_lock_bh(&port->sep_alua_lock);
682 list_for_each_entry(deve_tmp, &port->sep_alua_list,
683 alua_port_list) {
684 /*
685 * This pointer will be NULL for demo mode MappedLUNs
125d0119 686 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 687 * MappedLUN group for the SCSI Initiator Node ACL.
688 */
6708bb27 689 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 690 continue;
691
692 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
693 /*
694 * Skip the matching struct se_node_acl that is allocated
695 * above..
696 */
697 if (nacl == nacl_tmp)
698 continue;
699 /*
700 * Only perform PR registrations for target ports on
701 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
702 * arrived.
703 */
704 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
705 continue;
706 /*
707 * Look for a matching Initiator Node ACL in ASCII format
708 */
709 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
710 continue;
711
712 atomic_inc(&deve_tmp->pr_ref_count);
4e857c58 713 smp_mb__after_atomic();
c66ac9db
NB		 714 spin_unlock_bh(&port->sep_alua_lock);
715 /*
716 * Grab a configfs group dependency that is released
717 * for the exception path at label out: below, or upon
718 * completion of adding ALL_TG_PT=1 registrations in
719 * __core_scsi3_add_registration()
720 */
721 ret = core_scsi3_lunacl_depend_item(deve_tmp);
722 if (ret < 0) {
6708bb27 723 pr_err("core_scsi3_lunacl_depend"
c66ac9db
NB		 724 "_item() failed\n");
725 atomic_dec(&port->sep_tg_pt_ref_cnt);
4e857c58 726 smp_mb__after_atomic();
c66ac9db 727 atomic_dec(&deve_tmp->pr_ref_count);
4e857c58 728 smp_mb__after_atomic();
c66ac9db
NB		 729 goto out;
730 }
731 /*
732 * Located a matching SCSI Initiator Port on a different
733 * port, allocate the pr_reg_atp and attach it to the
734 * pr_reg->pr_reg_atp_list that will be processed once
735 * the original *pr_reg is processed in
736 * __core_scsi3_add_registration()
737 */
738 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
739 nacl_tmp, deve_tmp, NULL,
740 sa_res_key, all_tg_pt, aptpl);
6708bb27 741 if (!pr_reg_atp) {
c66ac9db 742 atomic_dec(&port->sep_tg_pt_ref_cnt);
4e857c58 743 smp_mb__after_atomic();
c66ac9db 744 atomic_dec(&deve_tmp->pr_ref_count);
4e857c58 745 smp_mb__after_atomic();
c66ac9db
NB		 746 core_scsi3_lunacl_undepend_item(deve_tmp);
747 goto out;
748 }
749
750 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
751 &pr_reg->pr_reg_atp_list);
752 spin_lock_bh(&port->sep_alua_lock);
753 }
754 spin_unlock_bh(&port->sep_alua_lock);
755
756 spin_lock(&dev->se_port_lock);
757 atomic_dec(&port->sep_tg_pt_ref_cnt);
4e857c58 758 smp_mb__after_atomic();
c66ac9db
NB		 759 }
760 spin_unlock(&dev->se_port_lock);
761
762 return pr_reg;
763out:
764 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
765 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
766 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
767 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
768 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
769 }
770 kmem_cache_free(t10_pr_reg_cache, pr_reg);
771 return NULL;
772}
773
774int core_scsi3_alloc_aptpl_registration(
e3d6f909 775 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 776 u64 sa_res_key,
777 unsigned char *i_port,
778 unsigned char *isid,
779 u32 mapped_lun,
780 unsigned char *t_port,
781 u16 tpgt,
782 u32 target_lun,
783 int res_holder,
784 int all_tg_pt,
785 u8 type)
786{
787 struct t10_pr_registration *pr_reg;
788
6708bb27
AG		 789 if (!i_port || !t_port || !sa_res_key) {
790 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 791 return -EINVAL;
c66ac9db
NB		 792 }
793
794 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 795 if (!pr_reg) {
796 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 797 return -ENOMEM;
c66ac9db 798 }
c66ac9db
NB		 799
800 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
801 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
802 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
803 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
804 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
805 atomic_set(&pr_reg->pr_res_holders, 0);
806 pr_reg->pr_reg_nacl = NULL;
807 pr_reg->pr_reg_deve = NULL;
808 pr_reg->pr_res_mapped_lun = mapped_lun;
809 pr_reg->pr_aptpl_target_lun = target_lun;
810 pr_reg->pr_res_key = sa_res_key;
811 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
812 pr_reg->pr_reg_aptpl = 1;
813 pr_reg->pr_reg_tg_pt_lun = NULL;
814 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
815 pr_reg->pr_res_type = type;
816 /*
817 * If an ISID value had been saved in APTPL metadata for this
818 * SCSI Initiator Port, restore it now.
819 */
820 if (isid != NULL) {
821 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
822 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
823 pr_reg->isid_present_at_reg = 1;
824 }
825 /*
826 * Copy the i_port and t_port information from caller.
827 */
828 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
829 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
830 pr_reg->pr_reg_tpgt = tpgt;
831 /*
832 * Set pr_res_holder from caller, the pr_reg who is the reservation
833 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
834 * the Initiator Node LUN ACL from the fabric module is created for
835 * this registration.
836 */
837 pr_reg->pr_res_holder = res_holder;
838
839 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 840 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 841 " metadata\n", (res_holder) ? "+reservation" : "");
842 return 0;
843}
844
845static void core_scsi3_aptpl_reserve(
846 struct se_device *dev,
847 struct se_portal_group *tpg,
848 struct se_node_acl *node_acl,
849 struct t10_pr_registration *pr_reg)
850{
851 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 852
853 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 854 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 855
856 spin_lock(&dev->dev_reservation_lock);
857 dev->dev_pr_res_holder = pr_reg;
858 spin_unlock(&dev->dev_reservation_lock);
859
6708bb27 860 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 861 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 862 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 863 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
864 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 865 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 866 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 867 i_buf);
c66ac9db
NB		 868}
869
870static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 871 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 872
873static int __core_scsi3_check_aptpl_registration(
874 struct se_device *dev,
875 struct se_portal_group *tpg,
876 struct se_lun *lun,
877 u32 target_lun,
878 struct se_node_acl *nacl,
879 struct se_dev_entry *deve)
880{
881 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 882 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 883 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
884 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
885 u16 tpgt;
886
887 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
888 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
889 /*
890 * Copy Initiator Port information from struct se_node_acl
891 */
892 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
893 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 894 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
895 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 896 /*
897 * Look for the matching registrations+reservation from those
898 * created from APTPL metadata. Note that multiple registrations
899 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
900 * TransportIDs.
901 */
902 spin_lock(&pr_tmpl->aptpl_reg_lock);
903 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
904 pr_reg_aptpl_list) {
6708bb27 905 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 906 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
907 !(strcmp(pr_reg->pr_tport, t_port)) &&
908 (pr_reg->pr_reg_tpgt == tpgt) &&
909 (pr_reg->pr_aptpl_target_lun == target_lun)) {
910
911 pr_reg->pr_reg_nacl = nacl;
912 pr_reg->pr_reg_deve = deve;
913 pr_reg->pr_reg_tg_pt_lun = lun;
914
915 list_del(&pr_reg->pr_reg_aptpl_list);
916 spin_unlock(&pr_tmpl->aptpl_reg_lock);
917 /*
918 * At this point all of the pointers in *pr_reg will
919 * be setup, so go ahead and add the registration.
920 */
921
922 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
923 /*
924 * If this registration is the reservation holder,
925 * make that happen now..
926 */
927 if (pr_reg->pr_res_holder)
928 core_scsi3_aptpl_reserve(dev, tpg,
929 nacl, pr_reg);
930 /*
931 * Reenable pr_aptpl_active to accept new metadata
932 * updates once the SCSI device is active again..
933 */
934 spin_lock(&pr_tmpl->aptpl_reg_lock);
935 pr_tmpl->pr_aptpl_active = 1;
936 }
937 }
938 spin_unlock(&pr_tmpl->aptpl_reg_lock);
939
940 return 0;
941}
942
943int core_scsi3_check_aptpl_registration(
944 struct se_device *dev,
945 struct se_portal_group *tpg,
946 struct se_lun *lun,
947 struct se_lun_acl *lun_acl)
948{
c66ac9db 949 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
f2083241 950 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
c66ac9db 951
d977f437 952 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 953 return 0;
954
955 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
956 lun->unpacked_lun, nacl, deve);
957}
958
959static void __core_scsi3_dump_registration(
960 struct target_core_fabric_ops *tfo,
961 struct se_device *dev,
962 struct se_node_acl *nacl,
963 struct t10_pr_registration *pr_reg,
33ce6a87 964 enum register_type register_type)
c66ac9db
NB		 965{
966 struct se_portal_group *se_tpg = nacl->se_tpg;
967 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 968
969 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 970 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 971
6708bb27 972 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 973 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
974 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 975 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 976 i_buf);
6708bb27 977 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 978 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
979 tfo->tpg_get_tag(se_tpg));
6708bb27 980 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 981 " Port(s)\n", tfo->get_fabric_name(),
982 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 983 dev->transport->name);
6708bb27 984 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 985 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
986 pr_reg->pr_res_key, pr_reg->pr_res_generation,
987 pr_reg->pr_reg_aptpl);
988}
989
990/*
991 * this function can be called with struct se_device->dev_reservation_lock
992 * when register_move = 1
993 */
994static void __core_scsi3_add_registration(
995 struct se_device *dev,
996 struct se_node_acl *nacl,
997 struct t10_pr_registration *pr_reg,
33ce6a87 998 enum register_type register_type,
c66ac9db
NB		 999 int register_move)
1000{
c66ac9db
NB		 1001 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1002 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1003 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1004
1005 /*
1006 * Increment PRgeneration counter for struct se_device upon a successful
1007 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1008 *
1009 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1010 * action, the struct se_device->dev_reservation_lock will already be held,
1011 * so we do not call core_scsi3_pr_generation() which grabs the lock
1012 * for the REGISTER.
1013 */
1014 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1015 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1016 core_scsi3_pr_generation(dev);
1017
1018 spin_lock(&pr_tmpl->registration_lock);
1019 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1020 pr_reg->pr_reg_deve->def_pr_registered = 1;
1021
1022 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1023 spin_unlock(&pr_tmpl->registration_lock);
1024 /*
1025 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1026 */
6708bb27 1027 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1028 return;
1029 /*
1030 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1031 * allocated in __core_scsi3_alloc_registration()
1032 */
1033 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1034 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1035 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1036
1037 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1038
1039 spin_lock(&pr_tmpl->registration_lock);
1040 list_add_tail(&pr_reg_tmp->pr_reg_list,
1041 &pr_tmpl->registration_list);
1042 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1043
1044 __core_scsi3_dump_registration(tfo, dev,
1045 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1046 register_type);
1047 spin_unlock(&pr_tmpl->registration_lock);
1048 /*
1049 * Drop configfs group dependency reference from
1050 * __core_scsi3_alloc_registration()
1051 */
1052 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1053 }
1054}
1055
1056static int core_scsi3_alloc_registration(
1057 struct se_device *dev,
1058 struct se_node_acl *nacl,
1059 struct se_dev_entry *deve,
1060 unsigned char *isid,
1061 u64 sa_res_key,
1062 int all_tg_pt,
1063 int aptpl,
33ce6a87 1064 enum register_type register_type,
c66ac9db
NB		 1065 int register_move)
1066{
1067 struct t10_pr_registration *pr_reg;
1068
1069 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1070 sa_res_key, all_tg_pt, aptpl);
6708bb27 1071 if (!pr_reg)
e3d6f909 1072 return -EPERM;
c66ac9db
NB		 1073
1074 __core_scsi3_add_registration(dev, nacl, pr_reg,
1075 register_type, register_move);
1076 return 0;
1077}
1078
1079static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1080 struct se_device *dev,
1081 struct se_node_acl *nacl,
1082 unsigned char *isid)
1083{
0fd97ccf 1084 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1085 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1086 struct se_portal_group *tpg;
1087
1088 spin_lock(&pr_tmpl->registration_lock);
1089 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1090 &pr_tmpl->registration_list, pr_reg_list) {
1091 /*
1092 * First look for a matching struct se_node_acl
1093 */
1094 if (pr_reg->pr_reg_nacl != nacl)
1095 continue;
1096
1097 tpg = pr_reg->pr_reg_nacl->se_tpg;
1098 /*
1099 * If this registration does NOT contain a fabric provided
1100 * ISID, then we have found a match.
1101 */
6708bb27 1102 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1103 /*
1104 * Determine if this SCSI device server requires that
1105 * SCSI Intiatior TransportID w/ ISIDs is enforced
1106 * for fabric modules (iSCSI) requiring them.
1107 */
e3d6f909 1108 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1109 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1110 continue;
1111 }
1112 atomic_inc(&pr_reg->pr_res_holders);
4e857c58 1113 smp_mb__after_atomic();
c66ac9db
NB		 1114 spin_unlock(&pr_tmpl->registration_lock);
1115 return pr_reg;
1116 }
1117 /*
1118 * If the *pr_reg contains a fabric defined ISID for multi-value
1119 * SCSI Initiator Port TransportIDs, then we expect a valid
1120 * matching ISID to be provided by the local SCSI Initiator Port.
1121 */
6708bb27 1122 if (!isid)
c66ac9db
NB		 1123 continue;
1124 if (strcmp(isid, pr_reg->pr_reg_isid))
1125 continue;
1126
1127 atomic_inc(&pr_reg->pr_res_holders);
4e857c58 1128 smp_mb__after_atomic();
c66ac9db
NB		 1129 spin_unlock(&pr_tmpl->registration_lock);
1130 return pr_reg;
1131 }
1132 spin_unlock(&pr_tmpl->registration_lock);
1133
1134 return NULL;
1135}
1136
1137static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1138 struct se_device *dev,
1139 struct se_node_acl *nacl,
1140 struct se_session *sess)
1141{
1142 struct se_portal_group *tpg = nacl->se_tpg;
1143 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1144
e3d6f909 1145 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1146 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1147 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1148 PR_REG_ISID_LEN);
1149 isid_ptr = &buf[0];
1150 }
1151
1152 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1153}
1154
1155static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1156{
1157 atomic_dec(&pr_reg->pr_res_holders);
4e857c58 1158 smp_mb__after_atomic();
c66ac9db
NB		 1159}
1160
125d0119 1161static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1162 struct se_device *dev,
1163 struct t10_pr_registration *pr_reg)
1164{
1165 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1166 struct t10_pr_registration *pr_res_holder;
1167 int ret = 0;
1168
1169 spin_lock(&dev->dev_reservation_lock);
1170 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1171 if (!pr_res_holder) {
c66ac9db
NB		 1172 spin_unlock(&dev->dev_reservation_lock);
1173 return ret;
1174 }
1175 if (pr_res_holder == pr_reg) {
1176 /*
125d0119 1177 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1178 * is being released is holding the reservation.
1179 *
1180 * From spc4r17, section 5.7.11.1:
1181 *
1182 * e) If the I_T nexus is the persistent reservation holder
1183 * and the persistent reservation is not an all registrants
1184 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1185 * service action or REGISTER AND IGNORE EXISTING KEY
1186 * service action with the SERVICE ACTION RESERVATION KEY
1187 * field set to zero (see 5.7.11.3).
1188 */
1189 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1190 ret = 1;
1191 /*
1192 * For 'All Registrants' reservation types, all existing
1193 * registrations are still processed as reservation holders
1194 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1195 * reservation holder is implicitly released here.
c66ac9db
NB		 1196 */
1197 } else if (pr_reg->pr_reg_all_tg_pt &&
1198 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1199 pr_reg->pr_reg_nacl->initiatorname)) &&
1200 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1201 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1202 " UNREGISTER while existing reservation with matching"
1203 " key 0x%016Lx is present from another SCSI Initiator"
1204 " Port\n", pr_reg->pr_res_key);
e3d6f909 1205 ret = -EPERM;
c66ac9db
NB		 1206 }
1207 spin_unlock(&dev->dev_reservation_lock);
1208
1209 return ret;
1210}
1211
1212/*
e3d6f909 1213 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1214 */
1215static void __core_scsi3_free_registration(
1216 struct se_device *dev,
1217 struct t10_pr_registration *pr_reg,
1218 struct list_head *preempt_and_abort_list,
1219 int dec_holders)
1220{
1221 struct target_core_fabric_ops *tfo =
1222 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1223 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1224 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1225
1226 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1227 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 1228
1229 pr_reg->pr_reg_deve->def_pr_registered = 0;
1230 pr_reg->pr_reg_deve->pr_res_key = 0;
1231 list_del(&pr_reg->pr_reg_list);
1232 /*
1233 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1234 * so call core_scsi3_put_pr_reg() to decrement our reference.
1235 */
1236 if (dec_holders)
1237 core_scsi3_put_pr_reg(pr_reg);
1238 /*
1239 * Wait until all reference from any other I_T nexuses for this
1240 * *pr_reg have been released. Because list_del() is called above,
1241 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1242 * count back to zero, and we release *pr_reg.
1243 */
1244 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1245 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1246 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1247 tfo->get_fabric_name());
1248 cpu_relax();
1249 spin_lock(&pr_tmpl->registration_lock);
1250 }
1251
6708bb27 1252 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1253 " Node: %s%s\n", tfo->get_fabric_name(),
1254 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1255 i_buf);
6708bb27 1256 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1257 " Port(s)\n", tfo->get_fabric_name(),
1258 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1259 dev->transport->name);
6708bb27 1260 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1261 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1262 pr_reg->pr_res_generation);
1263
6708bb27 1264 if (!preempt_and_abort_list) {
c66ac9db
NB		 1265 pr_reg->pr_reg_deve = NULL;
1266 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1267 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1268 return;
1269 }
1270 /*
1271 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1272 * are released once the ABORT_TASK_SET has completed..
1273 */
1274 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1275}
1276
1277void core_scsi3_free_pr_reg_from_nacl(
1278 struct se_device *dev,
1279 struct se_node_acl *nacl)
1280{
0fd97ccf 1281 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1282 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1283 /*
1284 * If the passed se_node_acl matches the reservation holder,
1285 * release the reservation.
1286 */
1287 spin_lock(&dev->dev_reservation_lock);
1288 pr_res_holder = dev->dev_pr_res_holder;
1289 if ((pr_res_holder != NULL) &&
1290 (pr_res_holder->pr_reg_nacl == nacl))
1291 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1292 spin_unlock(&dev->dev_reservation_lock);
1293 /*
1294 * Release any registration associated with the struct se_node_acl.
1295 */
1296 spin_lock(&pr_tmpl->registration_lock);
1297 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1298 &pr_tmpl->registration_list, pr_reg_list) {
1299
1300 if (pr_reg->pr_reg_nacl != nacl)
1301 continue;
1302
1303 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1304 }
1305 spin_unlock(&pr_tmpl->registration_lock);
1306}
1307
1308void core_scsi3_free_all_registrations(
1309 struct se_device *dev)
1310{
0fd97ccf 1311 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1312 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1313
1314 spin_lock(&dev->dev_reservation_lock);
1315 pr_res_holder = dev->dev_pr_res_holder;
1316 if (pr_res_holder != NULL) {
1317 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1318 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1319 pr_res_holder, 0);
1320 }
1321 spin_unlock(&dev->dev_reservation_lock);
1322
1323 spin_lock(&pr_tmpl->registration_lock);
1324 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1325 &pr_tmpl->registration_list, pr_reg_list) {
1326
1327 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1328 }
1329 spin_unlock(&pr_tmpl->registration_lock);
1330
1331 spin_lock(&pr_tmpl->aptpl_reg_lock);
1332 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1333 pr_reg_aptpl_list) {
1334 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1335 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1336 }
1337 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1338}
1339
1340static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1341{
e3d6f909 1342 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1343 &tpg->tpg_group.cg_item);
1344}
1345
1346static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1347{
e3d6f909 1348 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1349 &tpg->tpg_group.cg_item);
1350
1351 atomic_dec(&tpg->tpg_pr_ref_count);
4e857c58 1352 smp_mb__after_atomic();
c66ac9db
NB		 1353}
1354
1355static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1356{
1357 struct se_portal_group *tpg = nacl->se_tpg;
1358
1359 if (nacl->dynamic_node_acl)
1360 return 0;
1361
e3d6f909 1362 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1363 &nacl->acl_group.cg_item);
1364}
1365
1366static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1367{
1368 struct se_portal_group *tpg = nacl->se_tpg;
1369
1370 if (nacl->dynamic_node_acl) {
1371 atomic_dec(&nacl->acl_pr_ref_count);
4e857c58 1372 smp_mb__after_atomic();
c66ac9db
NB		 1373 return;
1374 }
1375
e3d6f909 1376 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1377 &nacl->acl_group.cg_item);
1378
1379 atomic_dec(&nacl->acl_pr_ref_count);
4e857c58 1380 smp_mb__after_atomic();
c66ac9db
NB		 1381}
1382
1383static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1384{
1385 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1386 struct se_node_acl *nacl;
1387 struct se_portal_group *tpg;
1388 /*
1389 * For nacl->dynamic_node_acl=1
1390 */
6708bb27 1391 if (!lun_acl)
c66ac9db
NB		 1392 return 0;
1393
1394 nacl = lun_acl->se_lun_nacl;
1395 tpg = nacl->se_tpg;
1396
e3d6f909 1397 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1398 &lun_acl->se_lun_group.cg_item);
1399}
1400
1401static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1402{
1403 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1404 struct se_node_acl *nacl;
1405 struct se_portal_group *tpg;
1406 /*
1407 * For nacl->dynamic_node_acl=1
1408 */
6708bb27 1409 if (!lun_acl) {
c66ac9db 1410 atomic_dec(&se_deve->pr_ref_count);
4e857c58 1411 smp_mb__after_atomic();
c66ac9db
NB		 1412 return;
1413 }
1414 nacl = lun_acl->se_lun_nacl;
1415 tpg = nacl->se_tpg;
1416
e3d6f909 1417 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1418 &lun_acl->se_lun_group.cg_item);
1419
1420 atomic_dec(&se_deve->pr_ref_count);
4e857c58 1421 smp_mb__after_atomic();
c66ac9db
NB		 1422}
1423
de103c93
CH		 1424static sense_reason_t
1425core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1426 struct se_cmd *cmd,
1427 struct se_portal_group *tpg,
1428 unsigned char *l_isid,
1429 u64 sa_res_key,
1430 int all_tg_pt,
1431 int aptpl)
1432{
5951146d 1433 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1434 struct se_port *tmp_port;
1435 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1436 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1437 struct se_node_acl *dest_node_acl = NULL;
1438 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1439 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1440 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1441 LIST_HEAD(tid_dest_list);
c66ac9db
NB		 1442 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1443 struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1444 unsigned char *buf;
c66ac9db
NB		 1445 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1446 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
de103c93 1447 sense_reason_t ret;
c66ac9db 1448 u32 tpdl, tid_len = 0;
d2843c17 1449 int dest_local_nexus;
c66ac9db
NB		 1450 u32 dest_rtpi = 0;
1451
1452 memset(dest_iport, 0, 64);
c66ac9db 1453
f2083241 1454 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1455 /*
1456 * Allocate a struct pr_transport_id_holder and setup the
1457 * local_node_acl and local_se_deve pointers and add to
1458 * struct list_head tid_dest_list for add registration
1459 * processing in the loop of tid_dest_list below.
1460 */
1461 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1462 if (!tidh_new) {
1463 pr_err("Unable to allocate tidh_new\n");
de103c93 1464 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1465 }
1466 INIT_LIST_HEAD(&tidh_new->dest_list);
1467 tidh_new->dest_tpg = tpg;
1468 tidh_new->dest_node_acl = se_sess->se_node_acl;
1469 tidh_new->dest_se_deve = local_se_deve;
1470
5951146d 1471 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1472 se_sess->se_node_acl, local_se_deve, l_isid,
1473 sa_res_key, all_tg_pt, aptpl);
6708bb27 1474 if (!local_pr_reg) {
c66ac9db 1475 kfree(tidh_new);
de103c93 1476 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1477 }
1478 tidh_new->dest_pr_reg = local_pr_reg;
1479 /*
1480 * The local I_T nexus does not hold any configfs dependances,
1481 * so we set tid_h->dest_local_nexus=1 to prevent the
1482 * configfs_undepend_item() calls in the tid_dest_list loops below.
1483 */
1484 tidh_new->dest_local_nexus = 1;
1485 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1486
0d7f1299
PB		 1487 if (cmd->data_length < 28) {
1488 pr_warn("SPC-PR: Received PR OUT parameter list"
1489 " length too small: %u\n", cmd->data_length);
de103c93 1490 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1491 goto out;
1492 }
1493
4949314c 1494 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1495 if (!buf) {
1496 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1497 goto out;
1498 }
1499
c66ac9db
NB		 1500 /*
1501 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1502 * first extract TransportID Parameter Data Length, and make sure
1503 * the value matches up to the SCSI expected data transfer length.
1504 */
1505 tpdl = (buf[24] & 0xff) << 24;
1506 tpdl |= (buf[25] & 0xff) << 16;
1507 tpdl |= (buf[26] & 0xff) << 8;
1508 tpdl |= buf[27] & 0xff;
1509
1510 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1511 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1512 " does not equal CDB data_length: %u\n", tpdl,
1513 cmd->data_length);
de103c93
CH		 1514 ret = TCM_INVALID_PARAMETER_LIST;
1515 goto out_unmap;
c66ac9db
NB		 1516 }
1517 /*
1518 * Start processing the received transport IDs using the
1519 * receiving I_T Nexus portal's fabric dependent methods to
1520 * obtain the SCSI Initiator Port/Device Identifiers.
1521 */
1522 ptr = &buf[28];
1523
1524 while (tpdl > 0) {
1525 proto_ident = (ptr[0] & 0x0f);
1526 dest_tpg = NULL;
1527
1528 spin_lock(&dev->se_port_lock);
1529 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1530 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1531 if (!tmp_tpg)
c66ac9db 1532 continue;
e3d6f909 1533 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1534 if (!tmp_tf_ops)
c66ac9db 1535 continue;
6708bb27
AG		 1536 if (!tmp_tf_ops->get_fabric_proto_ident ||
1537 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1538 continue;
1539 /*
1540 * Look for the matching proto_ident provided by
1541 * the received TransportID
1542 */
1543 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1544 if (tmp_proto_ident != proto_ident)
1545 continue;
1546 dest_rtpi = tmp_port->sep_rtpi;
1547
1548 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1549 tmp_tpg, (const char *)ptr, &tid_len,
1550 &iport_ptr);
6708bb27 1551 if (!i_str)
c66ac9db
NB		 1552 continue;
1553
1554 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
4e857c58 1555 smp_mb__after_atomic();
c66ac9db
NB		 1556 spin_unlock(&dev->se_port_lock);
1557
de103c93 1558 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1559 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db
NB		 1560 " for tmp_tpg\n");
1561 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
4e857c58 1562 smp_mb__after_atomic();
de103c93
CH		 1563 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1564 goto out_unmap;
c66ac9db
NB		 1565 }
1566 /*
35d1efe8 1567 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1568 * from the decoded fabric module specific TransportID
1569 * at *i_str.
1570 */
28638887 1571 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1572 dest_node_acl = __core_tpg_get_initiator_node_acl(
1573 tmp_tpg, i_str);
1574 if (dest_node_acl) {
1575 atomic_inc(&dest_node_acl->acl_pr_ref_count);
4e857c58 1576 smp_mb__after_atomic();
c66ac9db 1577 }
28638887 1578 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1579
6708bb27 1580 if (!dest_node_acl) {
c66ac9db
NB		 1581 core_scsi3_tpg_undepend_item(tmp_tpg);
1582 spin_lock(&dev->se_port_lock);
1583 continue;
1584 }
1585
de103c93 1586 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1587 pr_err("configfs_depend_item() failed"
c66ac9db
NB		 1588 " for dest_node_acl->acl_group\n");
1589 atomic_dec(&dest_node_acl->acl_pr_ref_count);
4e857c58 1590 smp_mb__after_atomic();
c66ac9db 1591 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1592 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1593 goto out_unmap;
c66ac9db
NB		 1594 }
1595
1596 dest_tpg = tmp_tpg;
6708bb27 1597 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1598 " %s Port RTPI: %hu\n",
e3d6f909 1599 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1600 dest_node_acl->initiatorname, dest_rtpi);
1601
1602 spin_lock(&dev->se_port_lock);
1603 break;
1604 }
1605 spin_unlock(&dev->se_port_lock);
1606
6708bb27
AG		 1607 if (!dest_tpg) {
1608 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1609 " dest_tpg\n");
de103c93
CH		 1610 ret = TCM_INVALID_PARAMETER_LIST;
1611 goto out_unmap;
c66ac9db 1612 }
8b1e1244 1613
6708bb27 1614 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1615 " tid_len: %d for %s + %s\n",
e3d6f909 1616 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1617 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1618
c66ac9db 1619 if (tid_len > tpdl) {
6708bb27 1620 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1621 " %u for Transport ID: %s\n", tid_len, ptr);
1622 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1623 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1624 ret = TCM_INVALID_PARAMETER_LIST;
1625 goto out_unmap;
c66ac9db
NB		 1626 }
1627 /*
1628 * Locate the desintation struct se_dev_entry pointer for matching
1629 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1630 * Target Port.
1631 */
1632 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1633 dest_rtpi);
6708bb27
AG		 1634 if (!dest_se_deve) {
1635 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1636 " from destination RTPI: %hu\n",
e3d6f909 1637 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1638 dest_rtpi);
1639
1640 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1641 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1642 ret = TCM_INVALID_PARAMETER_LIST;
1643 goto out_unmap;
c66ac9db
NB		 1644 }
1645
de103c93 1646 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1647 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db
NB		 1648 " failed\n");
1649 atomic_dec(&dest_se_deve->pr_ref_count);
4e857c58 1650 smp_mb__after_atomic();
c66ac9db
NB		 1651 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1652 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1653 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1654 goto out_unmap;
c66ac9db 1655 }
8b1e1244 1656
6708bb27 1657 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1658 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1659 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1660 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1661
c66ac9db
NB		 1662 /*
1663 * Skip any TransportIDs that already have a registration for
1664 * this target port.
1665 */
1666 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1667 iport_ptr);
1668 if (pr_reg_e) {
1669 core_scsi3_put_pr_reg(pr_reg_e);
1670 core_scsi3_lunacl_undepend_item(dest_se_deve);
1671 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672 core_scsi3_tpg_undepend_item(dest_tpg);
1673 ptr += tid_len;
1674 tpdl -= tid_len;
1675 tid_len = 0;
1676 continue;
1677 }
1678 /*
1679 * Allocate a struct pr_transport_id_holder and setup
1680 * the dest_node_acl and dest_se_deve pointers for the
1681 * loop below.
1682 */
1683 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1684 GFP_KERNEL);
6708bb27
AG		 1685 if (!tidh_new) {
1686 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1687 core_scsi3_lunacl_undepend_item(dest_se_deve);
1688 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1689 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1690 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1691 goto out_unmap;
c66ac9db
NB		 1692 }
1693 INIT_LIST_HEAD(&tidh_new->dest_list);
1694 tidh_new->dest_tpg = dest_tpg;
1695 tidh_new->dest_node_acl = dest_node_acl;
1696 tidh_new->dest_se_deve = dest_se_deve;
1697
1698 /*
1699 * Allocate, but do NOT add the registration for the
1700 * TransportID referenced SCSI Initiator port. This
1701 * done because of the following from spc4r17 in section
1702 * 6.14.3 wrt SPEC_I_PT:
1703 *
1704 * "If a registration fails for any initiator port (e.g., if th
1705 * logical unit does not have enough resources available to
1706 * hold the registration information), no registrations shall be
1707 * made, and the command shall be terminated with
1708 * CHECK CONDITION status."
1709 *
1710 * That means we call __core_scsi3_alloc_registration() here,
1711 * and then call __core_scsi3_add_registration() in the
1712 * 2nd loop which will never fail.
1713 */
5951146d 1714 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1715 dest_node_acl, dest_se_deve, iport_ptr,
1716 sa_res_key, all_tg_pt, aptpl);
6708bb27 1717 if (!dest_pr_reg) {
c66ac9db
NB		 1718 core_scsi3_lunacl_undepend_item(dest_se_deve);
1719 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720 core_scsi3_tpg_undepend_item(dest_tpg);
1721 kfree(tidh_new);
de103c93
CH		 1722 ret = TCM_INVALID_PARAMETER_LIST;
1723 goto out_unmap;
c66ac9db
NB		 1724 }
1725 tidh_new->dest_pr_reg = dest_pr_reg;
1726 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1727
1728 ptr += tid_len;
1729 tpdl -= tid_len;
1730 tid_len = 0;
1731
1732 }
05d1c7c0 1733
4949314c 1734 transport_kunmap_data_sg(cmd);
05d1c7c0 1735
c66ac9db
NB		 1736 /*
1737 * Go ahead and create a registrations from tid_dest_list for the
1738 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1739 * and dest_se_deve.
1740 *
1741 * The SA Reservation Key from the PROUT is set for the
1742 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1743 * means that the TransportID Initiator port will be
1744 * registered on all of the target ports in the SCSI target device
1745 * ALL_TG_PT=0 means the registration will only be for the
1746 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1747 * was received.
1748 */
1749 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1750 dest_tpg = tidh->dest_tpg;
1751 dest_node_acl = tidh->dest_node_acl;
1752 dest_se_deve = tidh->dest_se_deve;
1753 dest_pr_reg = tidh->dest_pr_reg;
1754 dest_local_nexus = tidh->dest_local_nexus;
1755
1756 list_del(&tidh->dest_list);
1757 kfree(tidh);
1758
1759 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1760 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1761
5951146d 1762 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1763 dest_pr_reg, 0, 0);
1764
6708bb27 1765 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1766 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1767 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
d2843c17 1768 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
c66ac9db
NB		 1769
1770 if (dest_local_nexus)
1771 continue;
1772
1773 core_scsi3_lunacl_undepend_item(dest_se_deve);
1774 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1775 core_scsi3_tpg_undepend_item(dest_tpg);
1776 }
1777
1778 return 0;
de103c93 1779out_unmap:
4949314c 1780 transport_kunmap_data_sg(cmd);
de103c93 1781out:
c66ac9db
NB		 1782 /*
1783 * For the failure case, release everything from tid_dest_list
1784 * including *dest_pr_reg and the configfs dependances..
1785 */
1786 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1787 dest_tpg = tidh->dest_tpg;
1788 dest_node_acl = tidh->dest_node_acl;
1789 dest_se_deve = tidh->dest_se_deve;
1790 dest_pr_reg = tidh->dest_pr_reg;
1791 dest_local_nexus = tidh->dest_local_nexus;
1792
1793 list_del(&tidh->dest_list);
1794 kfree(tidh);
1795 /*
1796 * Release any extra ALL_TG_PT=1 registrations for
1797 * the SPEC_I_PT=1 case.
1798 */
1799 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1800 &dest_pr_reg->pr_reg_atp_list,
1801 pr_reg_atp_mem_list) {
1802 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1803 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1804 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1805 }
1806
c66ac9db
NB		 1807 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1808
1809 if (dest_local_nexus)
1810 continue;
1811
1812 core_scsi3_lunacl_undepend_item(dest_se_deve);
1813 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1814 core_scsi3_tpg_undepend_item(dest_tpg);
1815 }
1816 return ret;
1817}
1818
3c8a6228 1819static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1820 struct se_device *dev,
1821 unsigned char *buf,
0607decd 1822 u32 pr_aptpl_buf_len)
c66ac9db
NB		 1823{
1824 struct se_lun *lun;
1825 struct se_portal_group *tpg;
c66ac9db
NB		 1826 struct t10_pr_registration *pr_reg;
1827 unsigned char tmp[512], isid_buf[32];
1828 ssize_t len = 0;
1829 int reg_count = 0;
3c8a6228 1830 int ret = 0;
c66ac9db 1831
3c8a6228
AG		 1832 spin_lock(&dev->dev_reservation_lock);
1833 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1834 /*
1835 * Walk the registration list..
1836 */
0fd97ccf 1837 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1838 pr_reg_list) {
1839
1840 tmp[0] = '\0';
1841 isid_buf[0] = '\0';
1842 tpg = pr_reg->pr_reg_nacl->se_tpg;
1843 lun = pr_reg->pr_reg_tg_pt_lun;
1844 /*
1845 * Write out any ISID value to APTPL metadata that was included
1846 * in the original registration.
1847 */
1848 if (pr_reg->isid_present_at_reg)
1849 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1850 pr_reg->pr_reg_isid);
1851 /*
1852 * Include special metadata if the pr_reg matches the
1853 * reservation holder.
1854 */
1855 if (dev->dev_pr_res_holder == pr_reg) {
1856 snprintf(tmp, 512, "PR_REG_START: %d"
1857 "\ninitiator_fabric=%s\n"
1858 "initiator_node=%s\n%s"
1859 "sa_res_key=%llu\n"
1860 "res_holder=1\nres_type=%02x\n"
1861 "res_scope=%02x\nres_all_tg_pt=%d\n"
1862 "mapped_lun=%u\n", reg_count,
e3d6f909 1863 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1864 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1865 pr_reg->pr_res_key, pr_reg->pr_res_type,
1866 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1867 pr_reg->pr_res_mapped_lun);
1868 } else {
1869 snprintf(tmp, 512, "PR_REG_START: %d\n"
1870 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1871 "sa_res_key=%llu\nres_holder=0\n"
1872 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1873 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1874 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1875 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1876 pr_reg->pr_res_mapped_lun);
1877 }
1878
60d645a4 1879 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1880 pr_err("Unable to update renaming"
c66ac9db 1881 " APTPL metadata\n");
3c8a6228
AG		 1882 ret = -EMSGSIZE;
1883 goto out;
c66ac9db
NB		 1884 }
1885 len += sprintf(buf+len, "%s", tmp);
1886
1887 /*
1888 * Include information about the associated SCSI target port.
1889 */
1890 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1891 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1892 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1893 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1894 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1895 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1896
60d645a4 1897 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1898 pr_err("Unable to update renaming"
c66ac9db 1899 " APTPL metadata\n");
3c8a6228
AG		 1900 ret = -EMSGSIZE;
1901 goto out;
c66ac9db
NB		 1902 }
1903 len += sprintf(buf+len, "%s", tmp);
1904 reg_count++;
1905 }
c66ac9db 1906
6708bb27 1907 if (!reg_count)
c66ac9db
NB		 1908 len += sprintf(buf+len, "No Registrations or Reservations");
1909
3c8a6228
AG		 1910out:
1911 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1912 spin_unlock(&dev->dev_reservation_lock);
1913
1914 return ret;
1915}
1916
c66ac9db
NB		 1917static int __core_scsi3_write_aptpl_to_file(
1918 struct se_device *dev,
4dee96fb 1919 unsigned char *buf)
c66ac9db 1920{
0fd97ccf 1921 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1922 struct file *file;
c66ac9db
NB		 1923 int flags = O_RDWR | O_CREAT | O_TRUNC;
1924 char path[512];
4dee96fb 1925 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1926 int ret;
1927
c66ac9db
NB		 1928 memset(path, 0, 512);
1929
60d645a4 1930 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1931 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1932 " into path buffer\n");
e3d6f909 1933 return -EMSGSIZE;
c66ac9db
NB		 1934 }
1935
1936 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1937 file = filp_open(path, flags, 0600);
0e9b10a9 1938 if (IS_ERR(file)) {
6708bb27 1939 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1940 " failed\n", path);
0e9b10a9 1941 return PTR_ERR(file);
c66ac9db
NB		 1942 }
1943
4dee96fb 1944 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1945
0e9b10a9 1946 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1947
0e9b10a9 1948 if (ret < 0)
6708bb27 1949 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1950 fput(file);
c66ac9db 1951
f730f915 1952 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 1953}
1954
459f213b
AG		 1955/*
1956 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1957 * write out the updated metadata to struct file for this SCSI device.
1958 */
8a391857 1959static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 1960{
8a391857
NB		 1961 unsigned char *buf;
1962 int rc;
de103c93 1963
459f213b
AG		 1964 if (!aptpl) {
1965 char *null_buf = "No Registrations or Reservations\n";
1966
8a391857 1967 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 1968 dev->t10_pr.pr_aptpl_active = 0;
1969 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 1970
8a391857
NB		 1971 if (rc)
1972 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 1973
8a391857
NB		 1974 return 0;
1975 }
459f213b 1976
8a391857
NB		 1977 buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
1978 if (!buf)
1979 return TCM_OUT_OF_RESOURCES;
1980
1981 rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN);
1982 if (rc < 0) {
459f213b 1983 kfree(buf);
8a391857 1984 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1985 }
1986
8a391857
NB		 1987 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1988 if (rc != 0) {
1989 pr_err("SPC-3 PR: Could not update APTPL\n");
1990 kfree(buf);
1991 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1992 }
1993 dev->t10_pr.pr_aptpl_active = 1;
1994 kfree(buf);
1995 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1996 return 0;
c66ac9db
NB		 1997}
1998
de103c93
CH		 1999static sense_reason_t
2000core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 2001 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 2002{
e3d6f909 2003 struct se_session *se_sess = cmd->se_sess;
5951146d 2004 struct se_device *dev = cmd->se_dev;
c66ac9db 2005 struct se_dev_entry *se_deve;
e3d6f909 2006 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2007 struct se_portal_group *se_tpg;
bc118fe4 2008 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2009 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2010 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2011 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2012 int pr_holder = 0, type;
c66ac9db 2013
6708bb27
AG		 2014 if (!se_sess || !se_lun) {
2015 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2016 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2017 }
2018 se_tpg = se_sess->se_tpg;
f2083241 2019 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2020
e3d6f909 2021 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2022 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2023 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2024 PR_REG_ISID_LEN);
2025 isid_ptr = &isid_buf[0];
2026 }
2027 /*
2028 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2029 */
bc118fe4
AG		 2030 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2031 if (!pr_reg) {
c66ac9db 2032 if (res_key) {
6708bb27 2033 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2034 " for SA REGISTER, returning CONFLICT\n");
de103c93 2035 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2036 }
2037 /*
2038 * Do nothing but return GOOD status.
2039 */
6708bb27 2040 if (!sa_res_key)
03e98c9e 2041 return 0;
c66ac9db 2042
6708bb27 2043 if (!spec_i_pt) {
c66ac9db
NB		 2044 /*
2045 * Perform the Service Action REGISTER on the Initiator
2046 * Port Endpoint that the PRO was received from on the
2047 * Logical Unit of the SCSI device server.
2048 */
de103c93 2049 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2050 se_sess->se_node_acl, se_deve, isid_ptr,
2051 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2052 register_type, 0)) {
6708bb27 2053 pr_err("Unable to allocate"
c66ac9db 2054 " struct t10_pr_registration\n");
de103c93 2055 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2056 }
2057 } else {
2058 /*
2059 * Register both the Initiator port that received
2060 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2061 * TransportID from Parameter list and loop through
2062 * fabric dependent parameter list while calling
2063 * logic from of core_scsi3_alloc_registration() for
2064 * each TransportID provided SCSI Initiator Port/Device
2065 */
2066 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2067 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2068 if (ret != 0)
2069 return ret;
2070 }
c66ac9db 2071
459f213b 2072 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2073 }
2074
bc118fe4
AG		 2075 /* ok, existing registration */
2076
2077 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2078 pr_err("SPC-3 PR REGISTER: Received"
2079 " res_key: 0x%016Lx does not match"
2080 " existing SA REGISTER res_key:"
2081 " 0x%016Lx\n", res_key,
2082 pr_reg->pr_res_key);
2083 ret = TCM_RESERVATION_CONFLICT;
2084 goto out;
de103c93
CH		 2085 }
2086
2087 if (spec_i_pt) {
1f070cc2
AG		 2088 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2089 " set on a registered nexus\n");
de103c93 2090 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2091 goto out;
de103c93
CH		 2092 }
2093
2094 /*
2095 * An existing ALL_TG_PT=1 registration being released
2096 * must also set ALL_TG_PT=1 in the incoming PROUT.
2097 */
1f070cc2
AG		 2098 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2099 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2100 " registration exists, but ALL_TG_PT=1 bit not"
2101 " present in received PROUT\n");
2102 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2103 goto out;
de103c93
CH		 2104 }
2105
de103c93 2106 /*
51d9c41d 2107 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2108 */
51d9c41d
AG		 2109 if (sa_res_key) {
2110 /*
2111 * Increment PRgeneration counter for struct se_device"
2112 * upon a successful REGISTER, see spc4r17 section 6.3.2
2113 * READ_KEYS service action.
2114 */
2115 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2116 pr_reg->pr_res_key = sa_res_key;
2117 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2118 " Key for %s to: 0x%016Lx PRgeneration:"
2119 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2120 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2121 pr_reg->pr_reg_nacl->initiatorname,
2122 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2123
2124 } else {
2125 /*
2126 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2127 */
125d0119 2128 pr_holder = core_scsi3_check_implicit_release(
de103c93
CH		 2129 cmd->se_dev, pr_reg);
2130 if (pr_holder < 0) {
de103c93 2131 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2132 goto out;
c66ac9db 2133 }
fc09149d 2134 type = pr_reg->pr_res_type;
de103c93
CH		 2135
2136 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2137 /*
de103c93
CH		 2138 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2139 * and matching pr_res_key.
c66ac9db 2140 */
de103c93
CH		 2141 if (pr_reg->pr_reg_all_tg_pt) {
2142 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2143 &pr_tmpl->registration_list,
2144 pr_reg_list) {
2145
2146 if (!pr_reg_p->pr_reg_all_tg_pt)
2147 continue;
2148 if (pr_reg_p->pr_res_key != res_key)
2149 continue;
2150 if (pr_reg == pr_reg_p)
2151 continue;
2152 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2153 pr_reg_p->pr_reg_nacl->initiatorname))
2154 continue;
2155
2156 __core_scsi3_free_registration(dev,
2157 pr_reg_p, NULL, 0);
c66ac9db
NB		 2158 }
2159 }
de103c93 2160
c66ac9db 2161 /*
de103c93 2162 * Release the calling I_T Nexus registration now..
c66ac9db 2163 */
de103c93 2164 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2165 pr_reg = NULL;
c66ac9db 2166
de103c93
CH		 2167 /*
2168 * From spc4r17, section 5.7.11.3 Unregistering
2169 *
2170 * If the persistent reservation is a registrants only
2171 * type, the device server shall establish a unit
2172 * attention condition for the initiator port associated
2173 * with every registered I_T nexus except for the I_T
2174 * nexus on which the PERSISTENT RESERVE OUT command was
2175 * received, with the additional sense code set to
2176 * RESERVATIONS RELEASED.
2177 */
2178 if (pr_holder &&
fc09149d
NB		 2179 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2180 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2181 list_for_each_entry(pr_reg_p,
2182 &pr_tmpl->registration_list,
2183 pr_reg_list) {
2184
2185 core_scsi3_ua_allocate(
2186 pr_reg_p->pr_reg_nacl,
2187 pr_reg_p->pr_res_mapped_lun,
2188 0x2A,
2189 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2190 }
de103c93 2191 }
c66ac9db 2192
51d9c41d 2193 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2194 }
c66ac9db 2195
459f213b 2196 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2197
bc118fe4 2198out:
fc09149d
NB		 2199 if (pr_reg)
2200 core_scsi3_put_pr_reg(pr_reg);
de103c93 2201 return ret;
c66ac9db
NB		 2202}
2203
2204unsigned char *core_scsi3_pr_dump_type(int type)
2205{
2206 switch (type) {
2207 case PR_TYPE_WRITE_EXCLUSIVE:
2208 return "Write Exclusive Access";
2209 case PR_TYPE_EXCLUSIVE_ACCESS:
2210 return "Exclusive Access";
2211 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2212 return "Write Exclusive Access, Registrants Only";
2213 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2214 return "Exclusive Access, Registrants Only";
2215 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2216 return "Write Exclusive Access, All Registrants";
2217 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2218 return "Exclusive Access, All Registrants";
2219 default:
2220 break;
2221 }
2222
2223 return "Unknown SPC-3 PR Type";
2224}
2225
de103c93
CH		 2226static sense_reason_t
2227core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2228{
de103c93 2229 struct se_device *dev = cmd->se_dev;
e3d6f909 2230 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2231 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2232 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2233 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2234 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2235 sense_reason_t ret;
c66ac9db
NB		 2236
2237 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2238
6708bb27
AG		 2239 if (!se_sess || !se_lun) {
2240 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2241 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2242 }
c66ac9db
NB		 2243 /*
2244 * Locate the existing *pr_reg via struct se_node_acl pointers
2245 */
5951146d 2246 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2247 se_sess);
6708bb27
AG		 2248 if (!pr_reg) {
2249 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2250 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2251 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2252 }
2253 /*
2254 * From spc4r17 Section 5.7.9: Reserving:
2255 *
2256 * An application client creates a persistent reservation by issuing
2257 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2258 * a registered I_T nexus with the following parameters:
2259 * a) RESERVATION KEY set to the value of the reservation key that is
2260 * registered with the logical unit for the I_T nexus; and
2261 */
2262 if (res_key != pr_reg->pr_res_key) {
6708bb27 2263 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2264 " does not match existing SA REGISTER res_key:"
2265 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2266 ret = TCM_RESERVATION_CONFLICT;
2267 goto out_put_pr_reg;
c66ac9db
NB		 2268 }
2269 /*
2270 * From spc4r17 Section 5.7.9: Reserving:
2271 *
2272 * From above:
2273 * b) TYPE field and SCOPE field set to the persistent reservation
2274 * being created.
2275 *
2276 * Only one persistent reservation is allowed at a time per logical unit
2277 * and that persistent reservation has a scope of LU_SCOPE.
2278 */
2279 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2280 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2281 ret = TCM_INVALID_PARAMETER_LIST;
2282 goto out_put_pr_reg;
c66ac9db
NB		 2283 }
2284 /*
2285 * See if we have an existing PR reservation holder pointer at
2286 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2287 * *pr_res_holder.
2288 */
2289 spin_lock(&dev->dev_reservation_lock);
2290 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2291 if (pr_res_holder) {
c66ac9db
NB		 2292 /*
2293 * From spc4r17 Section 5.7.9: Reserving:
2294 *
2295 * If the device server receives a PERSISTENT RESERVE OUT
2296 * command from an I_T nexus other than a persistent reservation
2297 * holder (see 5.7.10) that attempts to create a persistent
2298 * reservation when a persistent reservation already exists for
2299 * the logical unit, then the command shall be completed with
2300 * RESERVATION CONFLICT status.
2301 */
2302 if (pr_res_holder != pr_reg) {
2303 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2304 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2305 " [%s]: %s while reservation already held by"
2306 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2307 cmd->se_tfo->get_fabric_name(),
c66ac9db 2308 se_sess->se_node_acl->initiatorname,
e3d6f909 2309 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2310 pr_res_holder->pr_reg_nacl->initiatorname);
2311
2312 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2313 ret = TCM_RESERVATION_CONFLICT;
2314 goto out_put_pr_reg;
c66ac9db
NB		 2315 }
2316 /*
2317 * From spc4r17 Section 5.7.9: Reserving:
2318 *
2319 * If a persistent reservation holder attempts to modify the
2320 * type or scope of an existing persistent reservation, the
2321 * command shall be completed with RESERVATION CONFLICT status.
2322 */
2323 if ((pr_res_holder->pr_res_type != type) ||
2324 (pr_res_holder->pr_res_scope != scope)) {
2325 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2326 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2327 " [%s]: %s trying to change TYPE and/or SCOPE,"
2328 " while reservation already held by [%s]: %s,"
2329 " returning RESERVATION_CONFLICT\n",
e3d6f909 2330 cmd->se_tfo->get_fabric_name(),
c66ac9db 2331 se_sess->se_node_acl->initiatorname,
e3d6f909 2332 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2333 pr_res_holder->pr_reg_nacl->initiatorname);
2334
2335 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2336 ret = TCM_RESERVATION_CONFLICT;
2337 goto out_put_pr_reg;
c66ac9db
NB		 2338 }
2339 /*
2340 * From spc4r17 Section 5.7.9: Reserving:
2341 *
2342 * If the device server receives a PERSISTENT RESERVE OUT
2343 * command with RESERVE service action where the TYPE field and
2344 * the SCOPE field contain the same values as the existing type
2345 * and scope from a persistent reservation holder, it shall not
2346 * make any change to the existing persistent reservation and
2347 * shall completethe command with GOOD status.
2348 */
2349 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2350 ret = 0;
2351 goto out_put_pr_reg;
c66ac9db
NB		 2352 }
2353 /*
2354 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2355 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2356 */
2357 pr_reg->pr_res_scope = scope;
2358 pr_reg->pr_res_type = type;
2359 pr_reg->pr_res_holder = 1;
2360 dev->dev_pr_res_holder = pr_reg;
d2843c17 2361 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2362
6708bb27 2363 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2364 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2365 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2366 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2367 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2368 cmd->se_tfo->get_fabric_name(),
c66ac9db 2369 se_sess->se_node_acl->initiatorname,
d2843c17 2370 i_buf);
c66ac9db
NB		 2371 spin_unlock(&dev->dev_reservation_lock);
2372
459f213b
AG		 2373 if (pr_tmpl->pr_aptpl_active)
2374 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2375
de103c93
CH		 2376 ret = 0;
2377out_put_pr_reg:
c66ac9db 2378 core_scsi3_put_pr_reg(pr_reg);
de103c93 2379 return ret;
c66ac9db
NB		 2380}
2381
de103c93
CH		 2382static sense_reason_t
2383core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2384 u64 res_key)
c66ac9db 2385{
c66ac9db
NB		 2386 switch (type) {
2387 case PR_TYPE_WRITE_EXCLUSIVE:
2388 case PR_TYPE_EXCLUSIVE_ACCESS:
2389 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2390 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2391 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2392 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2393 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2394 default:
6708bb27 2395 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2396 " 0x%02x\n", type);
de103c93 2397 return TCM_INVALID_CDB_FIELD;
c66ac9db 2398 }
c66ac9db
NB		 2399}
2400
2401/*
2402 * Called with struct se_device->dev_reservation_lock held.
2403 */
2404static void __core_scsi3_complete_pro_release(
2405 struct se_device *dev,
2406 struct se_node_acl *se_nacl,
2407 struct t10_pr_registration *pr_reg,
125d0119 2408 int explicit)
c66ac9db
NB		 2409{
2410 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2411 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2412
2413 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2414 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2415 /*
2416 * Go ahead and release the current PR reservation holder.
2417 */
2418 dev->dev_pr_res_holder = NULL;
2419
6708bb27 2420 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
c66ac9db 2421 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
125d0119 2422 tfo->get_fabric_name(), (explicit) ? "explicit" : "implicit",
c66ac9db
NB		 2423 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2424 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2425 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2426 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2427 i_buf);
c66ac9db
NB		 2428 /*
2429 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2430 */
2431 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2432}
2433
de103c93
CH		 2434static sense_reason_t
2435core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2436 u64 res_key)
c66ac9db
NB		 2437{
2438 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2439 struct se_session *se_sess = cmd->se_sess;
2440 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2441 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2442 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93
CH		 2443 int all_reg = 0;
2444 sense_reason_t ret = 0;
c66ac9db 2445
6708bb27
AG		 2446 if (!se_sess || !se_lun) {
2447 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2448 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2449 }
2450 /*
2451 * Locate the existing *pr_reg via struct se_node_acl pointers
2452 */
2453 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2454 if (!pr_reg) {
2455 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2456 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2457 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2458 }
2459 /*
2460 * From spc4r17 Section 5.7.11.2 Releasing:
2461 *
2462 * If there is no persistent reservation or in response to a persistent
2463 * reservation release request from a registered I_T nexus that is not a
2464 * persistent reservation holder (see 5.7.10), the device server shall
2465 * do the following:
2466 *
2467 * a) Not release the persistent reservation, if any;
2468 * b) Not remove any registrations; and
2469 * c) Complete the command with GOOD status.
2470 */
2471 spin_lock(&dev->dev_reservation_lock);
2472 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2473 if (!pr_res_holder) {
c66ac9db
NB		 2474 /*
2475 * No persistent reservation, return GOOD status.
2476 */
2477 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2478 goto out_put_pr_reg;
c66ac9db
NB		 2479 }
2480 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2481 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2482 all_reg = 1;
2483
2484 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2485 /*
2486 * Non 'All Registrants' PR Type cases..
2487 * Release request from a registered I_T nexus that is not a
2488 * persistent reservation holder. return GOOD status.
2489 */
2490 spin_unlock(&dev->dev_reservation_lock);
de103c93 2491 goto out_put_pr_reg;
c66ac9db 2492 }
de103c93 2493
c66ac9db
NB		 2494 /*
2495 * From spc4r17 Section 5.7.11.2 Releasing:
2496 *
2497 * Only the persistent reservation holder (see 5.7.10) is allowed to
2498 * release a persistent reservation.
2499 *
2500 * An application client releases the persistent reservation by issuing
2501 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2502 * an I_T nexus that is a persistent reservation holder with the
2503 * following parameters:
2504 *
2505 * a) RESERVATION KEY field set to the value of the reservation key
2506 * that is registered with the logical unit for the I_T nexus;
2507 */
2508 if (res_key != pr_reg->pr_res_key) {
6708bb27 2509 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2510 " does not match existing SA REGISTER res_key:"
2511 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2512 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2513 ret = TCM_RESERVATION_CONFLICT;
2514 goto out_put_pr_reg;
c66ac9db
NB		 2515 }
2516 /*
2517 * From spc4r17 Section 5.7.11.2 Releasing and above:
2518 *
2519 * b) TYPE field and SCOPE field set to match the persistent
2520 * reservation being released.
2521 */
2522 if ((pr_res_holder->pr_res_type != type) ||
2523 (pr_res_holder->pr_res_scope != scope)) {
2524 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2525 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2526 " reservation from [%s]: %s with different TYPE "
2527 "and/or SCOPE while reservation already held by"
2528 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2529 cmd->se_tfo->get_fabric_name(),
c66ac9db 2530 se_sess->se_node_acl->initiatorname,
e3d6f909 2531 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2532 pr_res_holder->pr_reg_nacl->initiatorname);
2533
2534 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2535 ret = TCM_RESERVATION_CONFLICT;
2536 goto out_put_pr_reg;
c66ac9db
NB		 2537 }
2538 /*
2539 * In response to a persistent reservation release request from the
2540 * persistent reservation holder the device server shall perform a
2541 * release by doing the following as an uninterrupted series of actions:
2542 * a) Release the persistent reservation;
2543 * b) Not remove any registration(s);
2544 * c) If the released persistent reservation is a registrants only type
2545 * or all registrants type persistent reservation,
2546 * the device server shall establish a unit attention condition for
2547 * the initiator port associated with every regis-
2548 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2549 * RESERVE OUT command with RELEASE service action was received,
2550 * with the additional sense code set to RESERVATIONS RELEASED; and
2551 * d) If the persistent reservation is of any other type, the device
2552 * server shall not establish a unit attention condition.
2553 */
2554 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2555 pr_reg, 1);
2556
2557 spin_unlock(&dev->dev_reservation_lock);
2558
2559 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2560 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2561 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2562 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2563 /*
2564 * If no UNIT ATTENTION conditions will be established for
2565 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2566 * go ahead and check for APTPL=1 update+write below
2567 */
2568 goto write_aptpl;
2569 }
2570
2571 spin_lock(&pr_tmpl->registration_lock);
2572 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2573 pr_reg_list) {
2574 /*
2575 * Do not establish a UNIT ATTENTION condition
2576 * for the calling I_T Nexus
2577 */
2578 if (pr_reg_p == pr_reg)
2579 continue;
2580
2581 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2582 pr_reg_p->pr_res_mapped_lun,
2583 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2584 }
2585 spin_unlock(&pr_tmpl->registration_lock);
2586
2587write_aptpl:
459f213b
AG		 2588 if (pr_tmpl->pr_aptpl_active)
2589 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2590
de103c93 2591out_put_pr_reg:
c66ac9db 2592 core_scsi3_put_pr_reg(pr_reg);
de103c93 2593 return ret;
c66ac9db
NB		 2594}
2595
de103c93
CH		 2596static sense_reason_t
2597core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2598{
2599 struct se_device *dev = cmd->se_dev;
2600 struct se_node_acl *pr_reg_nacl;
e3d6f909 2601 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2602 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2603 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2604 u32 pr_res_mapped_lun = 0;
2605 int calling_it_nexus = 0;
2606 /*
2607 * Locate the existing *pr_reg via struct se_node_acl pointers
2608 */
5951146d 2609 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2610 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2611 if (!pr_reg_n) {
2612 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2613 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2614 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2615 }
2616 /*
2617 * From spc4r17 section 5.7.11.6, Clearing:
2618 *
2619 * Any application client may release the persistent reservation and
2620 * remove all registrations from a device server by issuing a
2621 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2622 * registered I_T nexus with the following parameter:
2623 *
2624 * a) RESERVATION KEY field set to the value of the reservation key
2625 * that is registered with the logical unit for the I_T nexus.
2626 */
2627 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2628 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2629 " res_key: 0x%016Lx does not match"
2630 " existing SA REGISTER res_key:"
2631 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2632 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2633 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2634 }
2635 /*
2636 * a) Release the persistent reservation, if any;
2637 */
2638 spin_lock(&dev->dev_reservation_lock);
2639 pr_res_holder = dev->dev_pr_res_holder;
2640 if (pr_res_holder) {
2641 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2642 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2643 pr_res_holder, 0);
2644 }
2645 spin_unlock(&dev->dev_reservation_lock);
2646 /*
2647 * b) Remove all registration(s) (see spc4r17 5.7.7);
2648 */
2649 spin_lock(&pr_tmpl->registration_lock);
2650 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2651 &pr_tmpl->registration_list, pr_reg_list) {
2652
2653 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2654 pr_reg_nacl = pr_reg->pr_reg_nacl;
2655 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2656 __core_scsi3_free_registration(dev, pr_reg, NULL,
2657 calling_it_nexus);
2658 /*
2659 * e) Establish a unit attention condition for the initiator
2660 * port associated with every registered I_T nexus other
2661 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2662 * command with CLEAR service action was received, with the
2663 * additional sense code set to RESERVATIONS PREEMPTED.
2664 */
6708bb27 2665 if (!calling_it_nexus)
c66ac9db
NB		 2666 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2667 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2668 }
2669 spin_unlock(&pr_tmpl->registration_lock);
2670
6708bb27 2671 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2672 cmd->se_tfo->get_fabric_name());
c66ac9db 2673
459f213b 2674 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2675
2676 core_scsi3_pr_generation(dev);
2677 return 0;
2678}
2679
2680/*
2681 * Called with struct se_device->dev_reservation_lock held.
2682 */
2683static void __core_scsi3_complete_pro_preempt(
2684 struct se_device *dev,
2685 struct t10_pr_registration *pr_reg,
2686 struct list_head *preempt_and_abort_list,
2687 int type,
2688 int scope,
33ce6a87 2689 enum preempt_type preempt_type)
c66ac9db
NB		 2690{
2691 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2692 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2693 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2694
2695 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2696 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2697 /*
125d0119 2698 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2699 */
2700 if (dev->dev_pr_res_holder)
2701 __core_scsi3_complete_pro_release(dev, nacl,
2702 dev->dev_pr_res_holder, 0);
2703
2704 dev->dev_pr_res_holder = pr_reg;
2705 pr_reg->pr_res_holder = 1;
2706 pr_reg->pr_res_type = type;
2707 pr_reg->pr_res_scope = scope;
2708
6708bb27 2709 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2710 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2711 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2712 core_scsi3_pr_dump_type(type),
2713 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2714 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2715 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2716 nacl->initiatorname, i_buf);
c66ac9db
NB		 2717 /*
2718 * For PREEMPT_AND_ABORT, add the preempting reservation's
2719 * struct t10_pr_registration to the list that will be compared
2720 * against received CDBs..
2721 */
2722 if (preempt_and_abort_list)
2723 list_add_tail(&pr_reg->pr_reg_abort_list,
2724 preempt_and_abort_list);
2725}
2726
2727static void core_scsi3_release_preempt_and_abort(
2728 struct list_head *preempt_and_abort_list,
2729 struct t10_pr_registration *pr_reg_holder)
2730{
2731 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2732
2733 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2734 pr_reg_abort_list) {
2735
2736 list_del(&pr_reg->pr_reg_abort_list);
2737 if (pr_reg_holder == pr_reg)
2738 continue;
2739 if (pr_reg->pr_res_holder) {
6708bb27 2740 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2741 continue;
2742 }
2743
2744 pr_reg->pr_reg_deve = NULL;
2745 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2746 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2747 }
2748}
2749
de103c93
CH		 2750static sense_reason_t
2751core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2752 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2753{
5951146d 2754 struct se_device *dev = cmd->se_dev;
c66ac9db 2755 struct se_node_acl *pr_reg_nacl;
e3d6f909 2756 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2757 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2758 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2759 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2760 u32 pr_res_mapped_lun = 0;
2761 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
de103c93 2762 int prh_type = 0, prh_scope = 0;
c66ac9db 2763
de103c93
CH		 2764 if (!se_sess)
2765 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2766
5951146d 2767 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2768 se_sess);
6708bb27
AG		 2769 if (!pr_reg_n) {
2770 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2771 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2772 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2773 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2774 }
2775 if (pr_reg_n->pr_res_key != res_key) {
2776 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2777 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2778 }
2779 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2780 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2781 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2782 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2783 }
c66ac9db
NB		 2784
2785 spin_lock(&dev->dev_reservation_lock);
2786 pr_res_holder = dev->dev_pr_res_holder;
2787 if (pr_res_holder &&
2788 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2789 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2790 all_reg = 1;
2791
6708bb27 2792 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2793 spin_unlock(&dev->dev_reservation_lock);
2794 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2795 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2796 }
2797 /*
2798 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2799 *
2800 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2801 * persistent reservation holder or there is no persistent reservation
2802 * holder (i.e., there is no persistent reservation), then the device
2803 * server shall perform a preempt by doing the following in an
2804 * uninterrupted series of actions. (See below..)
2805 */
6708bb27 2806 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2807 /*
2808 * No existing or SA Reservation Key matching reservations..
2809 *
2810 * PROUT SA PREEMPT with All Registrant type reservations are
2811 * allowed to be processed without a matching SA Reservation Key
2812 */
2813 spin_lock(&pr_tmpl->registration_lock);
2814 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2815 &pr_tmpl->registration_list, pr_reg_list) {
2816 /*
2817 * Removing of registrations in non all registrants
2818 * type reservations without a matching SA reservation
2819 * key.
2820 *
2821 * a) Remove the registrations for all I_T nexuses
2822 * specified by the SERVICE ACTION RESERVATION KEY
2823 * field;
2824 * b) Ignore the contents of the SCOPE and TYPE fields;
2825 * c) Process tasks as defined in 5.7.1; and
2826 * d) Establish a unit attention condition for the
2827 * initiator port associated with every I_T nexus
2828 * that lost its registration other than the I_T
2829 * nexus on which the PERSISTENT RESERVE OUT command
2830 * was received, with the additional sense code set
2831 * to REGISTRATIONS PREEMPTED.
2832 */
6708bb27 2833 if (!all_reg) {
c66ac9db
NB		 2834 if (pr_reg->pr_res_key != sa_res_key)
2835 continue;
2836
2837 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2838 pr_reg_nacl = pr_reg->pr_reg_nacl;
2839 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2840 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2841 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db
NB		 2842 NULL, calling_it_nexus);
2843 released_regs++;
2844 } else {
2845 /*
2846 * Case for any existing all registrants type
2847 * reservation, follow logic in spc4r17 section
2848 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2849 *
2850 * For a ZERO SA Reservation key, release
125d0119 2851 * all other registrations and do an implicit
c66ac9db
NB		 2852 * release of active persistent reservation.
2853 *
2854 * For a non-ZERO SA Reservation key, only
2855 * release the matching reservation key from
2856 * registrations.
2857 */
2858 if ((sa_res_key) &&
2859 (pr_reg->pr_res_key != sa_res_key))
2860 continue;
2861
2862 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2863 if (calling_it_nexus)
2864 continue;
2865
2866 pr_reg_nacl = pr_reg->pr_reg_nacl;
2867 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2868 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2869 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db
NB		 2870 NULL, 0);
2871 released_regs++;
2872 }
6708bb27 2873 if (!calling_it_nexus)
c66ac9db
NB		 2874 core_scsi3_ua_allocate(pr_reg_nacl,
2875 pr_res_mapped_lun, 0x2A,
9e08e34e 2876 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2877 }
2878 spin_unlock(&pr_tmpl->registration_lock);
2879 /*
2880 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2881 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2882 * RESERVATION KEY field to a value that does not match any
2883 * registered reservation key, then the device server shall
2884 * complete the command with RESERVATION CONFLICT status.
2885 */
6708bb27 2886 if (!released_regs) {
c66ac9db
NB		 2887 spin_unlock(&dev->dev_reservation_lock);
2888 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2889 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2890 }
2891 /*
2892 * For an existing all registrants type reservation
2893 * with a zero SA rservation key, preempt the existing
2894 * reservation with the new PR type and scope.
2895 */
2896 if (pr_res_holder && all_reg && !(sa_res_key)) {
2897 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2898 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2899 type, scope, preempt_type);
c66ac9db 2900
33ce6a87 2901 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2902 core_scsi3_release_preempt_and_abort(
2903 &preempt_and_abort_list, pr_reg_n);
2904 }
2905 spin_unlock(&dev->dev_reservation_lock);
2906
459f213b
AG		 2907 if (pr_tmpl->pr_aptpl_active)
2908 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2909
2910 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2911 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2912 return 0;
2913 }
2914 /*
2915 * The PREEMPTing SA reservation key matches that of the
2916 * existing persistent reservation, first, we check if
2917 * we are preempting our own reservation.
2918 * From spc4r17, section 5.7.11.4.3 Preempting
2919 * persistent reservations and registration handling
2920 *
2921 * If an all registrants persistent reservation is not
2922 * present, it is not an error for the persistent
2923 * reservation holder to preempt itself (i.e., a
2924 * PERSISTENT RESERVE OUT with a PREEMPT service action
2925 * or a PREEMPT AND ABORT service action with the
2926 * SERVICE ACTION RESERVATION KEY value equal to the
2927 * persistent reservation holder's reservation key that
2928 * is received from the persistent reservation holder).
2929 * In that case, the device server shall establish the
2930 * new persistent reservation and maintain the
2931 * registration.
2932 */
2933 prh_type = pr_res_holder->pr_res_type;
2934 prh_scope = pr_res_holder->pr_res_scope;
2935 /*
2936 * If the SERVICE ACTION RESERVATION KEY field identifies a
2937 * persistent reservation holder (see 5.7.10), the device
2938 * server shall perform a preempt by doing the following as
2939 * an uninterrupted series of actions:
2940 *
2941 * a) Release the persistent reservation for the holder
2942 * identified by the SERVICE ACTION RESERVATION KEY field;
2943 */
2944 if (pr_reg_n != pr_res_holder)
2945 __core_scsi3_complete_pro_release(dev,
2946 pr_res_holder->pr_reg_nacl,
2947 dev->dev_pr_res_holder, 0);
2948 /*
2949 * b) Remove the registrations for all I_T nexuses identified
2950 * by the SERVICE ACTION RESERVATION KEY field, except the
2951 * I_T nexus that is being used for the PERSISTENT RESERVE
2952 * OUT command. If an all registrants persistent reservation
2953 * is present and the SERVICE ACTION RESERVATION KEY field
2954 * is set to zero, then all registrations shall be removed
2955 * except for that of the I_T nexus that is being used for
2956 * the PERSISTENT RESERVE OUT command;
2957 */
2958 spin_lock(&pr_tmpl->registration_lock);
2959 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2960 &pr_tmpl->registration_list, pr_reg_list) {
2961
2962 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2963 if (calling_it_nexus)
2964 continue;
2965
2966 if (pr_reg->pr_res_key != sa_res_key)
2967 continue;
2968
2969 pr_reg_nacl = pr_reg->pr_reg_nacl;
2970 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2971 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2972 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 2973 calling_it_nexus);
2974 /*
2975 * e) Establish a unit attention condition for the initiator
2976 * port associated with every I_T nexus that lost its
2977 * persistent reservation and/or registration, with the
2978 * additional sense code set to REGISTRATIONS PREEMPTED;
2979 */
2980 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 2981 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2982 }
2983 spin_unlock(&pr_tmpl->registration_lock);
2984 /*
2985 * c) Establish a persistent reservation for the preempting
2986 * I_T nexus using the contents of the SCOPE and TYPE fields;
2987 */
2988 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2989 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2990 type, scope, preempt_type);
c66ac9db
NB		 2991 /*
2992 * d) Process tasks as defined in 5.7.1;
2993 * e) See above..
2994 * f) If the type or scope has changed, then for every I_T nexus
2995 * whose reservation key was not removed, except for the I_T
2996 * nexus on which the PERSISTENT RESERVE OUT command was
2997 * received, the device server shall establish a unit
2998 * attention condition for the initiator port associated with
2999 * that I_T nexus, with the additional sense code set to
3000 * RESERVATIONS RELEASED. If the type or scope have not
3001 * changed, then no unit attention condition(s) shall be
3002 * established for this reason.
3003 */
3004 if ((prh_type != type) || (prh_scope != scope)) {
3005 spin_lock(&pr_tmpl->registration_lock);
3006 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3007 &pr_tmpl->registration_list, pr_reg_list) {
3008
3009 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3010 if (calling_it_nexus)
3011 continue;
3012
3013 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3014 pr_reg->pr_res_mapped_lun, 0x2A,
3015 ASCQ_2AH_RESERVATIONS_RELEASED);
3016 }
3017 spin_unlock(&pr_tmpl->registration_lock);
3018 }
3019 spin_unlock(&dev->dev_reservation_lock);
3020 /*
3021 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3022 * All received CDBs for the matching existing reservation and
3023 * registrations undergo ABORT_TASK logic.
3024 *
3025 * From there, core_scsi3_release_preempt_and_abort() will
3026 * release every registration in the list (which have already
3027 * been removed from the primary pr_reg list), except the
3028 * new persistent reservation holder, the calling Initiator Port.
3029 */
33ce6a87 3030 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3031 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3032 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3033 pr_reg_n);
3034 }
3035
459f213b
AG		 3036 if (pr_tmpl->pr_aptpl_active)
3037 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3038
3039 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3040 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3041 return 0;
3042}
3043
de103c93
CH		 3044static sense_reason_t
3045core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3046 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3047{
c66ac9db
NB		 3048 switch (type) {
3049 case PR_TYPE_WRITE_EXCLUSIVE:
3050 case PR_TYPE_EXCLUSIVE_ACCESS:
3051 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3052 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3053 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3054 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3055 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3056 sa_res_key, preempt_type);
c66ac9db 3057 default:
6708bb27 3058 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3059 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3060 return TCM_INVALID_CDB_FIELD;
c66ac9db 3061 }
c66ac9db
NB		 3062}
3063
3064
de103c93
CH		 3065static sense_reason_t
3066core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3067 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3068{
e3d6f909 3069 struct se_session *se_sess = cmd->se_sess;
5951146d 3070 struct se_device *dev = cmd->se_dev;
28168905 3071 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3072 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3073 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3074 struct se_port *se_port;
3075 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3076 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3077 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3078 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3079 unsigned char *buf;
c66ac9db
NB		 3080 unsigned char *initiator_str;
3081 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3082 u32 tid_len, tmp_tid_len;
d2843c17 3083 int new_reg = 0, type, scope, matching_iname;
de103c93 3084 sense_reason_t ret;
c66ac9db
NB		 3085 unsigned short rtpi;
3086 unsigned char proto_ident;
3087
6708bb27
AG		 3088 if (!se_sess || !se_lun) {
3089 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3090 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3091 }
de103c93 3092
c66ac9db
NB		 3093 memset(dest_iport, 0, 64);
3094 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3095 se_tpg = se_sess->se_tpg;
e3d6f909 3096 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3097 /*
3098 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3099 * Register behaviors for a REGISTER AND MOVE service action
3100 *
3101 * Locate the existing *pr_reg via struct se_node_acl pointers
3102 */
5951146d 3103 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3104 se_sess);
6708bb27
AG		 3105 if (!pr_reg) {
3106 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3107 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3108 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3109 }
3110 /*
3111 * The provided reservation key much match the existing reservation key
3112 * provided during this initiator's I_T nexus registration.
3113 */
3114 if (res_key != pr_reg->pr_res_key) {
6708bb27 3115 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3116 " res_key: 0x%016Lx does not match existing SA REGISTER"
3117 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3118 ret = TCM_RESERVATION_CONFLICT;
3119 goto out_put_pr_reg;
c66ac9db
NB		 3120 }
3121 /*
3122 * The service active reservation key needs to be non zero
3123 */
6708bb27
AG		 3124 if (!sa_res_key) {
3125 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3126 " sa_res_key\n");
de103c93
CH		 3127 ret = TCM_INVALID_PARAMETER_LIST;
3128 goto out_put_pr_reg;
c66ac9db 3129 }
05d1c7c0 3130
c66ac9db
NB		 3131 /*
3132 * Determine the Relative Target Port Identifier where the reservation
3133 * will be moved to for the TransportID containing SCSI initiator WWN
3134 * information.
3135 */
4949314c 3136 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3137 if (!buf) {
3138 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3139 goto out_put_pr_reg;
3140 }
3141
c66ac9db
NB		 3142 rtpi = (buf[18] & 0xff) << 8;
3143 rtpi |= buf[19] & 0xff;
3144 tid_len = (buf[20] & 0xff) << 24;
3145 tid_len |= (buf[21] & 0xff) << 16;
3146 tid_len |= (buf[22] & 0xff) << 8;
3147 tid_len |= buf[23] & 0xff;
4949314c 3148 transport_kunmap_data_sg(cmd);
05d1c7c0 3149 buf = NULL;
c66ac9db
NB		 3150
3151 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3152 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3153 " does not equal CDB data_length: %u\n", tid_len,
3154 cmd->data_length);
de103c93
CH		 3155 ret = TCM_INVALID_PARAMETER_LIST;
3156 goto out_put_pr_reg;
c66ac9db
NB		 3157 }
3158
3159 spin_lock(&dev->se_port_lock);
3160 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3161 if (se_port->sep_rtpi != rtpi)
3162 continue;
3163 dest_se_tpg = se_port->sep_tpg;
6708bb27 3164 if (!dest_se_tpg)
c66ac9db 3165 continue;
e3d6f909 3166 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3167 if (!dest_tf_ops)
c66ac9db
NB		 3168 continue;
3169
3170 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
4e857c58 3171 smp_mb__after_atomic();
c66ac9db
NB		 3172 spin_unlock(&dev->se_port_lock);
3173
de103c93 3174 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3175 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db
NB		 3176 " for dest_se_tpg\n");
3177 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
4e857c58 3178 smp_mb__after_atomic();
de103c93
CH		 3179 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3180 goto out_put_pr_reg;
c66ac9db
NB		 3181 }
3182
3183 spin_lock(&dev->se_port_lock);
3184 break;
3185 }
3186 spin_unlock(&dev->se_port_lock);
3187
6708bb27
AG		 3188 if (!dest_se_tpg || !dest_tf_ops) {
3189 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3190 " fabric ops from Relative Target Port Identifier:"
3191 " %hu\n", rtpi);
de103c93
CH		 3192 ret = TCM_INVALID_PARAMETER_LIST;
3193 goto out_put_pr_reg;
c66ac9db 3194 }
05d1c7c0 3195
4949314c 3196 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3197 if (!buf) {
3198 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3199 goto out_put_pr_reg;
3200 }
c66ac9db 3201 proto_ident = (buf[24] & 0x0f);
8b1e1244 3202
6708bb27 3203 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3204 " 0x%02x\n", proto_ident);
8b1e1244 3205
c66ac9db 3206 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3207 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3208 " proto_ident: 0x%02x does not match ident: 0x%02x"
3209 " from fabric: %s\n", proto_ident,
3210 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3211 dest_tf_ops->get_fabric_name());
de103c93 3212 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3213 goto out;
3214 }
3215 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3216 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3217 " containg a valid tpg_parse_pr_out_transport_id"
3218 " function pointer\n");
de103c93 3219 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3220 goto out;
3221 }
3222 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3223 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3224 if (!initiator_str) {
3225 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3226 " initiator_str from Transport ID\n");
de103c93 3227 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3228 goto out;
3229 }
3230
4949314c 3231 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3232 buf = NULL;
3233
6708bb27 3234 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3235 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3236 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3237 iport_ptr : "");
3238 /*
3239 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3240 * action specifies a TransportID that is the same as the initiator port
3241 * of the I_T nexus for the command received, then the command shall
3242 * be terminated with CHECK CONDITION status, with the sense key set to
3243 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3244 * IN PARAMETER LIST.
3245 */
3246 pr_reg_nacl = pr_reg->pr_reg_nacl;
3247 matching_iname = (!strcmp(initiator_str,
3248 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3249 if (!matching_iname)
c66ac9db
NB		 3250 goto after_iport_check;
3251
6708bb27
AG		 3252 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3253 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3254 " matches: %s on received I_T Nexus\n", initiator_str,
3255 pr_reg_nacl->initiatorname);
de103c93 3256 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3257 goto out;
3258 }
6708bb27
AG		 3259 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3261 " matches: %s %s on received I_T Nexus\n",
3262 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3263 pr_reg->pr_reg_isid);
de103c93 3264 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3265 goto out;
3266 }
3267after_iport_check:
3268 /*
3269 * Locate the destination struct se_node_acl from the received Transport ID
3270 */
28638887 3271 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3272 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3273 initiator_str);
3274 if (dest_node_acl) {
3275 atomic_inc(&dest_node_acl->acl_pr_ref_count);
4e857c58 3276 smp_mb__after_atomic();
c66ac9db 3277 }
28638887 3278 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3279
6708bb27
AG		 3280 if (!dest_node_acl) {
3281 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3282 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3283 initiator_str);
de103c93 3284 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3285 goto out;
3286 }
de103c93
CH		 3287
3288 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3289 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db
NB		 3290 " dest_node_acl\n");
3291 atomic_dec(&dest_node_acl->acl_pr_ref_count);
4e857c58 3292 smp_mb__after_atomic();
c66ac9db 3293 dest_node_acl = NULL;
de103c93 3294 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3295 goto out;
3296 }
8b1e1244 3297
6708bb27 3298 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3299 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3300 dest_node_acl->initiatorname);
8b1e1244 3301
c66ac9db
NB		 3302 /*
3303 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3304 * PORT IDENTIFIER.
3305 */
3306 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3307 if (!dest_se_deve) {
3308 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3309 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3310 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3311 goto out;
3312 }
3313
de103c93 3314 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3315 pr_err("core_scsi3_lunacl_depend_item() failed\n");
c66ac9db 3316 atomic_dec(&dest_se_deve->pr_ref_count);
4e857c58 3317 smp_mb__after_atomic();
c66ac9db 3318 dest_se_deve = NULL;
de103c93 3319 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3320 goto out;
3321 }
8b1e1244 3322
6708bb27 3323 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3324 " ACL for dest_se_deve->mapped_lun: %u\n",
3325 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3326 dest_se_deve->mapped_lun);
8b1e1244 3327
c66ac9db
NB		 3328 /*
3329 * A persistent reservation needs to already existing in order to
3330 * successfully complete the REGISTER_AND_MOVE service action..
3331 */
3332 spin_lock(&dev->dev_reservation_lock);
3333 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3334 if (!pr_res_holder) {
3335 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3336 " currently held\n");
3337 spin_unlock(&dev->dev_reservation_lock);
de103c93 3338 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3339 goto out;
3340 }
3341 /*
3342 * The received on I_T Nexus must be the reservation holder.
3343 *
3344 * From spc4r17 section 5.7.8 Table 50 --
3345 * Register behaviors for a REGISTER AND MOVE service action
3346 */
3347 if (pr_res_holder != pr_reg) {
6708bb27 3348 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3349 " Nexus is not reservation holder\n");
3350 spin_unlock(&dev->dev_reservation_lock);
de103c93 3351 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3352 goto out;
3353 }
3354 /*
3355 * From spc4r17 section 5.7.8: registering and moving reservation
3356 *
3357 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3358 * action is received and the established persistent reservation is a
3359 * Write Exclusive - All Registrants type or Exclusive Access -
3360 * All Registrants type reservation, then the command shall be completed
3361 * with RESERVATION CONFLICT status.
3362 */
3363 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3364 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3365 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3366 " reservation for type: %s\n",
3367 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3368 spin_unlock(&dev->dev_reservation_lock);
de103c93 3369 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3370 goto out;
3371 }
3372 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3373 /*
3374 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3375 */
3376 type = pr_res_holder->pr_res_type;
3377 scope = pr_res_holder->pr_res_type;
3378 /*
3379 * c) Associate the reservation key specified in the SERVICE ACTION
3380 * RESERVATION KEY field with the I_T nexus specified as the
3381 * destination of the register and move, where:
3382 * A) The I_T nexus is specified by the TransportID and the
3383 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3384 * B) Regardless of the TransportID format used, the association for
3385 * the initiator port is based on either the initiator port name
3386 * (see 3.1.71) on SCSI transport protocols where port names are
3387 * required or the initiator port identifier (see 3.1.70) on SCSI
3388 * transport protocols where port names are not required;
3389 * d) Register the reservation key specified in the SERVICE ACTION
3390 * RESERVATION KEY field;
3391 * e) Retain the reservation key specified in the SERVICE ACTION
3392 * RESERVATION KEY field and associated information;
3393 *
3394 * Also, It is not an error for a REGISTER AND MOVE service action to
3395 * register an I_T nexus that is already registered with the same
3396 * reservation key or a different reservation key.
3397 */
3398 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3399 iport_ptr);
6708bb27 3400 if (!dest_pr_reg) {
de103c93 3401 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3402 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3403 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3404 spin_unlock(&dev->dev_reservation_lock);
de103c93 3405 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3406 goto out;
3407 }
3408 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3409 iport_ptr);
3410 new_reg = 1;
3411 }
3412 /*
3413 * f) Release the persistent reservation for the persistent reservation
3414 * holder (i.e., the I_T nexus on which the
3415 */
3416 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3417 dev->dev_pr_res_holder, 0);
3418 /*
3419 * g) Move the persistent reservation to the specified I_T nexus using
3420 * the same scope and type as the persistent reservation released in
3421 * item f); and
3422 */
3423 dev->dev_pr_res_holder = dest_pr_reg;
3424 dest_pr_reg->pr_res_holder = 1;
3425 dest_pr_reg->pr_res_type = type;
3426 pr_reg->pr_res_scope = scope;
d2843c17 3427 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3428 /*
3429 * Increment PRGeneration for existing registrations..
3430 */
6708bb27 3431 if (!new_reg)
c66ac9db
NB		 3432 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3433 spin_unlock(&dev->dev_reservation_lock);
3434
6708bb27 3435 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3436 " created new reservation holder TYPE: %s on object RTPI:"
3437 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3438 core_scsi3_pr_dump_type(type), rtpi,
3439 dest_pr_reg->pr_res_generation);
6708bb27 3440 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3441 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3442 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3443 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3444 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3445 iport_ptr : "");
3446 /*
3447 * It is now safe to release configfs group dependencies for destination
3448 * of Transport ID Initiator Device/Port Identifier
3449 */
3450 core_scsi3_lunacl_undepend_item(dest_se_deve);
3451 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3452 core_scsi3_tpg_undepend_item(dest_se_tpg);
3453 /*
3454 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3455 * nexus on which PERSISTENT RESERVE OUT command was received.
3456 */
3457 if (unreg) {
3458 spin_lock(&pr_tmpl->registration_lock);
3459 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3460 spin_unlock(&pr_tmpl->registration_lock);
3461 } else
3462 core_scsi3_put_pr_reg(pr_reg);
3463
459f213b 3464 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3465
4949314c 3466 transport_kunmap_data_sg(cmd);
05d1c7c0 3467
c66ac9db
NB		 3468 core_scsi3_put_pr_reg(dest_pr_reg);
3469 return 0;
3470out:
05d1c7c0 3471 if (buf)
4949314c 3472 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3473 if (dest_se_deve)
3474 core_scsi3_lunacl_undepend_item(dest_se_deve);
3475 if (dest_node_acl)
3476 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3477 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3478
3479out_put_pr_reg:
c66ac9db
NB		 3480 core_scsi3_put_pr_reg(pr_reg);
3481 return ret;
3482}
3483
3484static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3485{
3486 unsigned int __v1, __v2;
3487
3488 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3489 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3490
3491 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3492}
3493
3494/*
3495 * See spc4r17 section 6.14 Table 170
3496 */
de103c93
CH		 3497sense_reason_t
3498target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3499{
617c0e06 3500 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3501 unsigned char *buf;
c66ac9db
NB		 3502 u64 res_key, sa_res_key;
3503 int sa, scope, type, aptpl;
3504 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3505 sense_reason_t ret;
617c0e06
CH		 3506
3507 /*
3508 * Following spc2r20 5.5.1 Reservations overview:
3509 *
3510 * If a logical unit has been reserved by any RESERVE command and is
3511 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3512 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3513 * initiator or service action and shall terminate with a RESERVATION
3514 * CONFLICT status.
3515 */
0fd97ccf 3516 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3517 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3518 " SPC-2 reservation is held, returning"
3519 " RESERVATION_CONFLICT\n");
de103c93 3520 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3521 }
3522
c66ac9db
NB		 3523 /*
3524 * FIXME: A NULL struct se_session pointer means an this is not coming from
3525 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3526 */
de103c93
CH		 3527 if (!cmd->se_sess)
3528 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3529
3530 if (cmd->data_length < 24) {
6708bb27 3531 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3532 " length too small: %u\n", cmd->data_length);
de103c93 3533 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3534 }
de103c93 3535
c66ac9db
NB		 3536 /*
3537 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3538 */
3539 sa = (cdb[1] & 0x1f);
3540 scope = (cdb[2] & 0xf0);
3541 type = (cdb[2] & 0x0f);
05d1c7c0 3542
4949314c 3543 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3544 if (!buf)
3545 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3546
c66ac9db
NB		 3547 /*
3548 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3549 */
3550 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3551 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3552 /*
3553 * REGISTER_AND_MOVE uses a different SA parameter list containing
3554 * SCSI TransportIDs.
3555 */
3556 if (sa != PRO_REGISTER_AND_MOVE) {
3557 spec_i_pt = (buf[20] & 0x08);
3558 all_tg_pt = (buf[20] & 0x04);
3559 aptpl = (buf[20] & 0x01);
3560 } else {
3561 aptpl = (buf[17] & 0x01);
3562 unreg = (buf[17] & 0x02);
3563 }
4949314c 3564 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3565 buf = NULL;
3566
c66ac9db
NB		 3567 /*
3568 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3569 */
de103c93
CH		 3570 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3571 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3572
c66ac9db
NB		 3573 /*
3574 * From spc4r17 section 6.14:
3575 *
3576 * If the SPEC_I_PT bit is set to zero, the service action is not
3577 * REGISTER AND MOVE, and the parameter list length is not 24, then
3578 * the command shall be terminated with CHECK CONDITION status, with
3579 * the sense key set to ILLEGAL REQUEST, and the additional sense
3580 * code set to PARAMETER LIST LENGTH ERROR.
3581 */
6708bb27 3582 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3583 (cmd->data_length != 24)) {
6708bb27 3584 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3585 " list length: %u\n", cmd->data_length);
de103c93 3586 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3587 }
de103c93 3588
c66ac9db
NB		 3589 /*
3590 * (core_scsi3_emulate_pro_* function parameters
3591 * are defined by spc4r17 Table 174:
3592 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3593 */
3594 switch (sa) {
3595 case PRO_REGISTER:
d29a5b6a 3596 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3597 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3598 break;
c66ac9db 3599 case PRO_RESERVE:
d29a5b6a
CH		 3600 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3601 break;
c66ac9db 3602 case PRO_RELEASE:
d29a5b6a
CH		 3603 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3604 break;
c66ac9db 3605 case PRO_CLEAR:
d29a5b6a
CH		 3606 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3607 break;
c66ac9db 3608 case PRO_PREEMPT:
d29a5b6a 3609 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3610 res_key, sa_res_key, PREEMPT);
d29a5b6a 3611 break;
c66ac9db 3612 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3613 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3614 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3615 break;
c66ac9db 3616 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3617 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3618 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3619 break;
c66ac9db 3620 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3621 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3622 sa_res_key, aptpl, unreg);
d29a5b6a 3623 break;
c66ac9db 3624 default:
6708bb27 3625 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3626 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3627 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3628 }
3629
6bb35e00
CH		 3630 if (!ret)
3631 target_complete_cmd(cmd, GOOD);
d29a5b6a 3632 return ret;
c66ac9db
NB		 3633}
3634
3635/*
3636 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3637 *
3638 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3639 */
de103c93
CH		 3640static sense_reason_t
3641core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3642{
0fd97ccf 3643 struct se_device *dev = cmd->se_dev;
c66ac9db 3644 struct t10_pr_registration *pr_reg;
05d1c7c0 3645 unsigned char *buf;
c66ac9db
NB		 3646 u32 add_len = 0, off = 8;
3647
3648 if (cmd->data_length < 8) {
6708bb27 3649 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3650 " too small\n", cmd->data_length);
de103c93 3651 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3652 }
3653
4949314c 3654 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3655 if (!buf)
3656 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3657
0fd97ccf
CH		 3658 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3659 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3660 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3661 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3662
0fd97ccf
CH		 3663 spin_lock(&dev->t10_pr.registration_lock);
3664 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3665 pr_reg_list) {
3666 /*
3667 * Check for overflow of 8byte PRI READ_KEYS payload and
3668 * next reservation key list descriptor.
3669 */
3670 if ((add_len + 8) > (cmd->data_length - 8))
3671 break;
3672
3673 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3674 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3675 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3676 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3677 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3678 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3679 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3680 buf[off++] = (pr_reg->pr_res_key & 0xff);
3681
3682 add_len += 8;
3683 }
0fd97ccf 3684 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3685
3686 buf[4] = ((add_len >> 24) & 0xff);
3687 buf[5] = ((add_len >> 16) & 0xff);
3688 buf[6] = ((add_len >> 8) & 0xff);
3689 buf[7] = (add_len & 0xff);
3690
4949314c 3691 transport_kunmap_data_sg(cmd);
05d1c7c0 3692
c66ac9db
NB		 3693 return 0;
3694}
3695
3696/*
3697 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3698 *
3699 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3700 */
de103c93
CH		 3701static sense_reason_t
3702core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3703{
0fd97ccf 3704 struct se_device *dev = cmd->se_dev;
c66ac9db 3705 struct t10_pr_registration *pr_reg;
05d1c7c0 3706 unsigned char *buf;
c66ac9db
NB		 3707 u64 pr_res_key;
3708 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3709
3710 if (cmd->data_length < 8) {
6708bb27 3711 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3712 " too small\n", cmd->data_length);
de103c93 3713 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3714 }
3715
4949314c 3716 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3717 if (!buf)
3718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3719
0fd97ccf
CH		 3720 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3721 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3722 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3723 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3724
0fd97ccf
CH		 3725 spin_lock(&dev->dev_reservation_lock);
3726 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3727 if (pr_reg) {
c66ac9db
NB		 3728 /*
3729 * Set the hardcoded Additional Length
3730 */
3731 buf[4] = ((add_len >> 24) & 0xff);
3732 buf[5] = ((add_len >> 16) & 0xff);
3733 buf[6] = ((add_len >> 8) & 0xff);
3734 buf[7] = (add_len & 0xff);
3735
05d1c7c0
AG		 3736 if (cmd->data_length < 22)
3737 goto err;
3738
c66ac9db
NB		 3739 /*
3740 * Set the Reservation key.
3741 *
3742 * From spc4r17, section 5.7.10:
3743 * A persistent reservation holder has its reservation key
3744 * returned in the parameter data from a PERSISTENT
3745 * RESERVE IN command with READ RESERVATION service action as
3746 * follows:
3747 * a) For a persistent reservation of the type Write Exclusive
3748 * - All Registrants or Exclusive Access ­ All Regitrants,
3749 * the reservation key shall be set to zero; or
3750 * b) For all other persistent reservation types, the
3751 * reservation key shall be set to the registered
3752 * reservation key for the I_T nexus that holds the
3753 * persistent reservation.
3754 */
3755 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3756 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3757 pr_res_key = 0;
3758 else
3759 pr_res_key = pr_reg->pr_res_key;
3760
3761 buf[8] = ((pr_res_key >> 56) & 0xff);
3762 buf[9] = ((pr_res_key >> 48) & 0xff);
3763 buf[10] = ((pr_res_key >> 40) & 0xff);
3764 buf[11] = ((pr_res_key >> 32) & 0xff);
3765 buf[12] = ((pr_res_key >> 24) & 0xff);
3766 buf[13] = ((pr_res_key >> 16) & 0xff);
3767 buf[14] = ((pr_res_key >> 8) & 0xff);
3768 buf[15] = (pr_res_key & 0xff);
3769 /*
3770 * Set the SCOPE and TYPE
3771 */
3772 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3773 (pr_reg->pr_res_type & 0x0f);
3774 }
05d1c7c0
AG		 3775
3776err:
0fd97ccf 3777 spin_unlock(&dev->dev_reservation_lock);
4949314c 3778 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3779
3780 return 0;
3781}
3782
3783/*
3784 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3785 *
3786 * See spc4r17 section 6.13.4 Table 165
3787 */
de103c93
CH		 3788static sense_reason_t
3789core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3790{
5951146d 3791 struct se_device *dev = cmd->se_dev;
0fd97ccf 3792 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3793 unsigned char *buf;
c66ac9db
NB		 3794 u16 add_len = 8; /* Hardcoded to 8. */
3795
3796 if (cmd->data_length < 6) {
6708bb27 3797 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3798 " %u too small\n", cmd->data_length);
de103c93 3799 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3800 }
3801
4949314c 3802 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3803 if (!buf)
3804 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3805
c66ac9db
NB		 3806 buf[0] = ((add_len << 8) & 0xff);
3807 buf[1] = (add_len & 0xff);
3808 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3809 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3810 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3811 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3812 /*
3813 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3814 * set the TMV: Task Mask Valid bit.
3815 */
3816 buf[3] |= 0x80;
3817 /*
3818 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3819 */
3820 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3821 /*
3822 * PTPL_A: Persistence across Target Power Loss Active bit
3823 */
3824 if (pr_tmpl->pr_aptpl_active)
3825 buf[3] |= 0x01;
3826 /*
3827 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3828 */
3829 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3830 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3831 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3832 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3833 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3834 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3835
4949314c 3836 transport_kunmap_data_sg(cmd);
05d1c7c0 3837
c66ac9db
NB		 3838 return 0;
3839}
3840
3841/*
3842 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3843 *
3844 * See spc4r17 section 6.13.5 Table 168 and 169
3845 */
de103c93
CH		 3846static sense_reason_t
3847core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3848{
0fd97ccf 3849 struct se_device *dev = cmd->se_dev;
c66ac9db 3850 struct se_node_acl *se_nacl;
c66ac9db
NB		 3851 struct se_portal_group *se_tpg;
3852 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3853 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3854 unsigned char *buf;
c66ac9db
NB		 3855 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3856 u32 off = 8; /* off into first Full Status descriptor */
3857 int format_code = 0;
3858
3859 if (cmd->data_length < 8) {
6708bb27 3860 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3861 " too small\n", cmd->data_length);
de103c93 3862 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3863 }
3864
4949314c 3865 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3866 if (!buf)
3867 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3868
0fd97ccf
CH		 3869 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3870 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3871 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3872 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db
NB		 3873
3874 spin_lock(&pr_tmpl->registration_lock);
3875 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3876 &pr_tmpl->registration_list, pr_reg_list) {
3877
3878 se_nacl = pr_reg->pr_reg_nacl;
3879 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3880 add_desc_len = 0;
3881
3882 atomic_inc(&pr_reg->pr_res_holders);
4e857c58 3883 smp_mb__after_atomic();
c66ac9db
NB		 3884 spin_unlock(&pr_tmpl->registration_lock);
3885 /*
3886 * Determine expected length of $FABRIC_MOD specific
3887 * TransportID full status descriptor..
3888 */
e3d6f909 3889 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 3890 se_tpg, se_nacl, pr_reg, &format_code);
3891
3892 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 3893 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3894 " out of buffer: %d\n", cmd->data_length);
3895 spin_lock(&pr_tmpl->registration_lock);
3896 atomic_dec(&pr_reg->pr_res_holders);
4e857c58 3897 smp_mb__after_atomic();
c66ac9db
NB		 3898 break;
3899 }
3900 /*
3901 * Set RESERVATION KEY
3902 */
3903 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3904 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3905 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3906 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3907 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3908 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3909 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3910 buf[off++] = (pr_reg->pr_res_key & 0xff);
3911 off += 4; /* Skip Over Reserved area */
3912
3913 /*
3914 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3915 */
3916 if (pr_reg->pr_reg_all_tg_pt)
3917 buf[off] = 0x02;
3918 /*
3919 * The struct se_lun pointer will be present for the
3920 * reservation holder for PR_HOLDER bit.
3921 *
3922 * Also, if this registration is the reservation
3923 * holder, fill in SCOPE and TYPE in the next byte.
3924 */
3925 if (pr_reg->pr_res_holder) {
3926 buf[off++] |= 0x01;
3927 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3928 (pr_reg->pr_res_type & 0x0f);
3929 } else
3930 off += 2;
3931
3932 off += 4; /* Skip over reserved area */
3933 /*
3934 * From spc4r17 6.3.15:
3935 *
3936 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3937 * IDENTIFIER field contains the relative port identifier (see
3938 * 3.1.120) of the target port that is part of the I_T nexus
3939 * described by this full status descriptor. If the ALL_TG_PT
3940 * bit is set to one, the contents of the RELATIVE TARGET PORT
3941 * IDENTIFIER field are not defined by this standard.
3942 */
6708bb27 3943 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 3944 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
3945
3946 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
3947 buf[off++] = (port->sep_rtpi & 0xff);
3948 } else
35d1efe8 3949 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 3950
3951 /*
3952 * Now, have the $FABRIC_MOD fill in the protocol identifier
3953 */
e3d6f909 3954 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 3955 se_nacl, pr_reg, &format_code, &buf[off+4]);
3956
3957 spin_lock(&pr_tmpl->registration_lock);
3958 atomic_dec(&pr_reg->pr_res_holders);
4e857c58 3959 smp_mb__after_atomic();
c66ac9db
NB		 3960 /*
3961 * Set the ADDITIONAL DESCRIPTOR LENGTH
3962 */
3963 buf[off++] = ((desc_len >> 24) & 0xff);
3964 buf[off++] = ((desc_len >> 16) & 0xff);
3965 buf[off++] = ((desc_len >> 8) & 0xff);
3966 buf[off++] = (desc_len & 0xff);
3967 /*
3968 * Size of full desctipor header minus TransportID
3969 * containing $FABRIC_MOD specific) initiator device/port
3970 * WWN information.
3971 *
3972 * See spc4r17 Section 6.13.5 Table 169
3973 */
3974 add_desc_len = (24 + desc_len);
3975
3976 off += desc_len;
3977 add_len += add_desc_len;
3978 }
3979 spin_unlock(&pr_tmpl->registration_lock);
3980 /*
3981 * Set ADDITIONAL_LENGTH
3982 */
3983 buf[4] = ((add_len >> 24) & 0xff);
3984 buf[5] = ((add_len >> 16) & 0xff);
3985 buf[6] = ((add_len >> 8) & 0xff);
3986 buf[7] = (add_len & 0xff);
3987
4949314c 3988 transport_kunmap_data_sg(cmd);
05d1c7c0 3989
c66ac9db
NB		 3990 return 0;
3991}
3992
de103c93
CH		 3993sense_reason_t
3994target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 3995{
de103c93 3996 sense_reason_t ret;
e76a35d6 3997
c66ac9db
NB		 3998 /*
3999 * Following spc2r20 5.5.1 Reservations overview:
4000 *
4001 * If a logical unit has been reserved by any RESERVE command and is
4002 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4003 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4004 * initiator or service action and shall terminate with a RESERVATION
4005 * CONFLICT status.
4006 */
0fd97ccf 4007 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4008 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4009 " SPC-2 reservation is held, returning"
4010 " RESERVATION_CONFLICT\n");
de103c93 4011 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4012 }
4013
617c0e06
CH		 4014 switch (cmd->t_task_cdb[1] & 0x1f) {
4015 case PRI_READ_KEYS:
d29a5b6a
CH		 4016 ret = core_scsi3_pri_read_keys(cmd);
4017 break;
617c0e06 4018 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4019 ret = core_scsi3_pri_read_reservation(cmd);
4020 break;
617c0e06 4021 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4022 ret = core_scsi3_pri_report_capabilities(cmd);
4023 break;
617c0e06 4024 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4025 ret = core_scsi3_pri_read_full_status(cmd);
4026 break;
617c0e06
CH		 4027 default:
4028 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4029 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4030 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4031 }
4032
6bb35e00
CH		 4033 if (!ret)
4034 target_complete_cmd(cmd, GOOD);
d29a5b6a 4035 return ret;
c66ac9db
NB		 4036}
4037
de103c93
CH		 4038sense_reason_t
4039target_check_reservation(struct se_cmd *cmd)
c66ac9db 4040{
d977f437 4041 struct se_device *dev = cmd->se_dev;
de103c93 4042 sense_reason_t ret;
c66ac9db 4043
d977f437
CH		 4044 if (!cmd->se_sess)
4045 return 0;
4046 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4047 return 0;
4048 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4049 return 0;
c66ac9db 4050
d977f437
CH		 4051 spin_lock(&dev->dev_reservation_lock);
4052 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4053 ret = target_scsi2_reservation_check(cmd);
4054 else
4055 ret = target_scsi3_pr_reservation_check(cmd);
4056 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4057
d977f437 4058 return ret;
c66ac9db 4059}
Linux kernel - Deliverables
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