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target: Remove t10_reservation.pr_aptpl_buf_len
[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 *
fd9a11d7 7 * (c) Copyright 2009-2012 RisingTide Systems LLC.
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) {
6708bb27 477 pr_debug("Allowing explict 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
AG		 509 if (!registered_nexus) {
510 pr_debug("Allowing implict 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
6708bb27 525 pr_debug("Allowing implict 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
4e529be2 609 pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_ATOMIC);
6708bb27
AG		 610 if (!pr_reg->pr_aptpl_buf) {
611 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
c66ac9db
NB		 612 kmem_cache_free(t10_pr_reg_cache, pr_reg);
613 return NULL;
614 }
615
616 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
617 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
618 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
619 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
620 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
621 atomic_set(&pr_reg->pr_res_holders, 0);
622 pr_reg->pr_reg_nacl = nacl;
623 pr_reg->pr_reg_deve = deve;
624 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
625 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
626 pr_reg->pr_res_key = sa_res_key;
627 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
628 pr_reg->pr_reg_aptpl = aptpl;
629 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
630 /*
631 * If an ISID value for this SCSI Initiator Port exists,
632 * save it to the registration now.
633 */
634 if (isid != NULL) {
635 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
636 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
637 pr_reg->isid_present_at_reg = 1;
638 }
639
640 return pr_reg;
641}
642
643static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
644static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
645
646/*
647 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
648 * modes.
649 */
650static struct t10_pr_registration *__core_scsi3_alloc_registration(
651 struct se_device *dev,
652 struct se_node_acl *nacl,
653 struct se_dev_entry *deve,
654 unsigned char *isid,
655 u64 sa_res_key,
656 int all_tg_pt,
657 int aptpl)
658{
659 struct se_dev_entry *deve_tmp;
660 struct se_node_acl *nacl_tmp;
661 struct se_port *port, *port_tmp;
662 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
663 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
664 int ret;
665 /*
666 * Create a registration for the I_T Nexus upon which the
667 * PROUT REGISTER was received.
668 */
669 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
670 sa_res_key, all_tg_pt, aptpl);
6708bb27 671 if (!pr_reg)
c66ac9db
NB		 672 return NULL;
673 /*
674 * Return pointer to pr_reg for ALL_TG_PT=0
675 */
6708bb27 676 if (!all_tg_pt)
c66ac9db
NB		 677 return pr_reg;
678 /*
679 * Create list of matching SCSI Initiator Port registrations
680 * for ALL_TG_PT=1
681 */
682 spin_lock(&dev->se_port_lock);
683 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
684 atomic_inc(&port->sep_tg_pt_ref_cnt);
685 smp_mb__after_atomic_inc();
686 spin_unlock(&dev->se_port_lock);
687
688 spin_lock_bh(&port->sep_alua_lock);
689 list_for_each_entry(deve_tmp, &port->sep_alua_list,
690 alua_port_list) {
691 /*
692 * This pointer will be NULL for demo mode MappedLUNs
693 * that have not been make explict via a ConfigFS
694 * MappedLUN group for the SCSI Initiator Node ACL.
695 */
6708bb27 696 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 697 continue;
698
699 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
700 /*
701 * Skip the matching struct se_node_acl that is allocated
702 * above..
703 */
704 if (nacl == nacl_tmp)
705 continue;
706 /*
707 * Only perform PR registrations for target ports on
708 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
709 * arrived.
710 */
711 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
712 continue;
713 /*
714 * Look for a matching Initiator Node ACL in ASCII format
715 */
716 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
717 continue;
718
719 atomic_inc(&deve_tmp->pr_ref_count);
720 smp_mb__after_atomic_inc();
721 spin_unlock_bh(&port->sep_alua_lock);
722 /*
723 * Grab a configfs group dependency that is released
724 * for the exception path at label out: below, or upon
725 * completion of adding ALL_TG_PT=1 registrations in
726 * __core_scsi3_add_registration()
727 */
728 ret = core_scsi3_lunacl_depend_item(deve_tmp);
729 if (ret < 0) {
6708bb27 730 pr_err("core_scsi3_lunacl_depend"
c66ac9db
NB		 731 "_item() failed\n");
732 atomic_dec(&port->sep_tg_pt_ref_cnt);
733 smp_mb__after_atomic_dec();
734 atomic_dec(&deve_tmp->pr_ref_count);
735 smp_mb__after_atomic_dec();
736 goto out;
737 }
738 /*
739 * Located a matching SCSI Initiator Port on a different
740 * port, allocate the pr_reg_atp and attach it to the
741 * pr_reg->pr_reg_atp_list that will be processed once
742 * the original *pr_reg is processed in
743 * __core_scsi3_add_registration()
744 */
745 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
746 nacl_tmp, deve_tmp, NULL,
747 sa_res_key, all_tg_pt, aptpl);
6708bb27 748 if (!pr_reg_atp) {
c66ac9db
NB		 749 atomic_dec(&port->sep_tg_pt_ref_cnt);
750 smp_mb__after_atomic_dec();
751 atomic_dec(&deve_tmp->pr_ref_count);
752 smp_mb__after_atomic_dec();
753 core_scsi3_lunacl_undepend_item(deve_tmp);
754 goto out;
755 }
756
757 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
758 &pr_reg->pr_reg_atp_list);
759 spin_lock_bh(&port->sep_alua_lock);
760 }
761 spin_unlock_bh(&port->sep_alua_lock);
762
763 spin_lock(&dev->se_port_lock);
764 atomic_dec(&port->sep_tg_pt_ref_cnt);
765 smp_mb__after_atomic_dec();
766 }
767 spin_unlock(&dev->se_port_lock);
768
769 return pr_reg;
770out:
771 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
772 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
773 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
774 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
775 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
776 }
777 kmem_cache_free(t10_pr_reg_cache, pr_reg);
778 return NULL;
779}
780
781int core_scsi3_alloc_aptpl_registration(
e3d6f909 782 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 783 u64 sa_res_key,
784 unsigned char *i_port,
785 unsigned char *isid,
786 u32 mapped_lun,
787 unsigned char *t_port,
788 u16 tpgt,
789 u32 target_lun,
790 int res_holder,
791 int all_tg_pt,
792 u8 type)
793{
794 struct t10_pr_registration *pr_reg;
795
6708bb27
AG		 796 if (!i_port || !t_port || !sa_res_key) {
797 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 798 return -EINVAL;
c66ac9db
NB		 799 }
800
801 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 802 if (!pr_reg) {
803 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 804 return -ENOMEM;
c66ac9db 805 }
4e529be2 806 pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
c66ac9db
NB		 807
808 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
809 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
810 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
811 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
812 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
813 atomic_set(&pr_reg->pr_res_holders, 0);
814 pr_reg->pr_reg_nacl = NULL;
815 pr_reg->pr_reg_deve = NULL;
816 pr_reg->pr_res_mapped_lun = mapped_lun;
817 pr_reg->pr_aptpl_target_lun = target_lun;
818 pr_reg->pr_res_key = sa_res_key;
819 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
820 pr_reg->pr_reg_aptpl = 1;
821 pr_reg->pr_reg_tg_pt_lun = NULL;
822 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
823 pr_reg->pr_res_type = type;
824 /*
825 * If an ISID value had been saved in APTPL metadata for this
826 * SCSI Initiator Port, restore it now.
827 */
828 if (isid != NULL) {
829 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
830 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
831 pr_reg->isid_present_at_reg = 1;
832 }
833 /*
834 * Copy the i_port and t_port information from caller.
835 */
836 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
837 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
838 pr_reg->pr_reg_tpgt = tpgt;
839 /*
840 * Set pr_res_holder from caller, the pr_reg who is the reservation
841 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
842 * the Initiator Node LUN ACL from the fabric module is created for
843 * this registration.
844 */
845 pr_reg->pr_res_holder = res_holder;
846
847 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 848 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 849 " metadata\n", (res_holder) ? "+reservation" : "");
850 return 0;
851}
852
853static void core_scsi3_aptpl_reserve(
854 struct se_device *dev,
855 struct se_portal_group *tpg,
856 struct se_node_acl *node_acl,
857 struct t10_pr_registration *pr_reg)
858{
859 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 860
861 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 862 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 863
864 spin_lock(&dev->dev_reservation_lock);
865 dev->dev_pr_res_holder = pr_reg;
866 spin_unlock(&dev->dev_reservation_lock);
867
6708bb27 868 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 869 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 870 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 871 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
872 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 873 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 874 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 875 i_buf);
c66ac9db
NB		 876}
877
878static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 879 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 880
881static int __core_scsi3_check_aptpl_registration(
882 struct se_device *dev,
883 struct se_portal_group *tpg,
884 struct se_lun *lun,
885 u32 target_lun,
886 struct se_node_acl *nacl,
887 struct se_dev_entry *deve)
888{
889 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 890 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 891 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
892 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
893 u16 tpgt;
894
895 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
896 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
897 /*
898 * Copy Initiator Port information from struct se_node_acl
899 */
900 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
901 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 902 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
903 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 904 /*
905 * Look for the matching registrations+reservation from those
906 * created from APTPL metadata. Note that multiple registrations
907 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
908 * TransportIDs.
909 */
910 spin_lock(&pr_tmpl->aptpl_reg_lock);
911 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
912 pr_reg_aptpl_list) {
6708bb27 913 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 914 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
915 !(strcmp(pr_reg->pr_tport, t_port)) &&
916 (pr_reg->pr_reg_tpgt == tpgt) &&
917 (pr_reg->pr_aptpl_target_lun == target_lun)) {
918
919 pr_reg->pr_reg_nacl = nacl;
920 pr_reg->pr_reg_deve = deve;
921 pr_reg->pr_reg_tg_pt_lun = lun;
922
923 list_del(&pr_reg->pr_reg_aptpl_list);
924 spin_unlock(&pr_tmpl->aptpl_reg_lock);
925 /*
926 * At this point all of the pointers in *pr_reg will
927 * be setup, so go ahead and add the registration.
928 */
929
930 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
931 /*
932 * If this registration is the reservation holder,
933 * make that happen now..
934 */
935 if (pr_reg->pr_res_holder)
936 core_scsi3_aptpl_reserve(dev, tpg,
937 nacl, pr_reg);
938 /*
939 * Reenable pr_aptpl_active to accept new metadata
940 * updates once the SCSI device is active again..
941 */
942 spin_lock(&pr_tmpl->aptpl_reg_lock);
943 pr_tmpl->pr_aptpl_active = 1;
944 }
945 }
946 spin_unlock(&pr_tmpl->aptpl_reg_lock);
947
948 return 0;
949}
950
951int core_scsi3_check_aptpl_registration(
952 struct se_device *dev,
953 struct se_portal_group *tpg,
954 struct se_lun *lun,
955 struct se_lun_acl *lun_acl)
956{
c66ac9db 957 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
f2083241 958 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
c66ac9db 959
d977f437 960 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 961 return 0;
962
963 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
964 lun->unpacked_lun, nacl, deve);
965}
966
967static void __core_scsi3_dump_registration(
968 struct target_core_fabric_ops *tfo,
969 struct se_device *dev,
970 struct se_node_acl *nacl,
971 struct t10_pr_registration *pr_reg,
33ce6a87 972 enum register_type register_type)
c66ac9db
NB		 973{
974 struct se_portal_group *se_tpg = nacl->se_tpg;
975 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 976
977 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 978 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 979
6708bb27 980 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 981 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
982 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 983 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 984 i_buf);
6708bb27 985 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 986 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
987 tfo->tpg_get_tag(se_tpg));
6708bb27 988 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 989 " Port(s)\n", tfo->get_fabric_name(),
990 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 991 dev->transport->name);
6708bb27 992 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 993 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
994 pr_reg->pr_res_key, pr_reg->pr_res_generation,
995 pr_reg->pr_reg_aptpl);
996}
997
998/*
999 * this function can be called with struct se_device->dev_reservation_lock
1000 * when register_move = 1
1001 */
1002static void __core_scsi3_add_registration(
1003 struct se_device *dev,
1004 struct se_node_acl *nacl,
1005 struct t10_pr_registration *pr_reg,
33ce6a87 1006 enum register_type register_type,
c66ac9db
NB		 1007 int register_move)
1008{
c66ac9db
NB		 1009 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1010 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1011 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1012
1013 /*
1014 * Increment PRgeneration counter for struct se_device upon a successful
1015 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1016 *
1017 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1018 * action, the struct se_device->dev_reservation_lock will already be held,
1019 * so we do not call core_scsi3_pr_generation() which grabs the lock
1020 * for the REGISTER.
1021 */
1022 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1023 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1024 core_scsi3_pr_generation(dev);
1025
1026 spin_lock(&pr_tmpl->registration_lock);
1027 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1028 pr_reg->pr_reg_deve->def_pr_registered = 1;
1029
1030 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1031 spin_unlock(&pr_tmpl->registration_lock);
1032 /*
1033 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1034 */
6708bb27 1035 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1036 return;
1037 /*
1038 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1039 * allocated in __core_scsi3_alloc_registration()
1040 */
1041 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1042 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1043 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1044
1045 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1046
1047 spin_lock(&pr_tmpl->registration_lock);
1048 list_add_tail(&pr_reg_tmp->pr_reg_list,
1049 &pr_tmpl->registration_list);
1050 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1051
1052 __core_scsi3_dump_registration(tfo, dev,
1053 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1054 register_type);
1055 spin_unlock(&pr_tmpl->registration_lock);
1056 /*
1057 * Drop configfs group dependency reference from
1058 * __core_scsi3_alloc_registration()
1059 */
1060 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1061 }
1062}
1063
1064static int core_scsi3_alloc_registration(
1065 struct se_device *dev,
1066 struct se_node_acl *nacl,
1067 struct se_dev_entry *deve,
1068 unsigned char *isid,
1069 u64 sa_res_key,
1070 int all_tg_pt,
1071 int aptpl,
33ce6a87 1072 enum register_type register_type,
c66ac9db
NB		 1073 int register_move)
1074{
1075 struct t10_pr_registration *pr_reg;
1076
1077 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1078 sa_res_key, all_tg_pt, aptpl);
6708bb27 1079 if (!pr_reg)
e3d6f909 1080 return -EPERM;
c66ac9db
NB		 1081
1082 __core_scsi3_add_registration(dev, nacl, pr_reg,
1083 register_type, register_move);
1084 return 0;
1085}
1086
1087static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1088 struct se_device *dev,
1089 struct se_node_acl *nacl,
1090 unsigned char *isid)
1091{
0fd97ccf 1092 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1093 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1094 struct se_portal_group *tpg;
1095
1096 spin_lock(&pr_tmpl->registration_lock);
1097 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1098 &pr_tmpl->registration_list, pr_reg_list) {
1099 /*
1100 * First look for a matching struct se_node_acl
1101 */
1102 if (pr_reg->pr_reg_nacl != nacl)
1103 continue;
1104
1105 tpg = pr_reg->pr_reg_nacl->se_tpg;
1106 /*
1107 * If this registration does NOT contain a fabric provided
1108 * ISID, then we have found a match.
1109 */
6708bb27 1110 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1111 /*
1112 * Determine if this SCSI device server requires that
1113 * SCSI Intiatior TransportID w/ ISIDs is enforced
1114 * for fabric modules (iSCSI) requiring them.
1115 */
e3d6f909 1116 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1117 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1118 continue;
1119 }
1120 atomic_inc(&pr_reg->pr_res_holders);
1121 smp_mb__after_atomic_inc();
1122 spin_unlock(&pr_tmpl->registration_lock);
1123 return pr_reg;
1124 }
1125 /*
1126 * If the *pr_reg contains a fabric defined ISID for multi-value
1127 * SCSI Initiator Port TransportIDs, then we expect a valid
1128 * matching ISID to be provided by the local SCSI Initiator Port.
1129 */
6708bb27 1130 if (!isid)
c66ac9db
NB		 1131 continue;
1132 if (strcmp(isid, pr_reg->pr_reg_isid))
1133 continue;
1134
1135 atomic_inc(&pr_reg->pr_res_holders);
1136 smp_mb__after_atomic_inc();
1137 spin_unlock(&pr_tmpl->registration_lock);
1138 return pr_reg;
1139 }
1140 spin_unlock(&pr_tmpl->registration_lock);
1141
1142 return NULL;
1143}
1144
1145static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1146 struct se_device *dev,
1147 struct se_node_acl *nacl,
1148 struct se_session *sess)
1149{
1150 struct se_portal_group *tpg = nacl->se_tpg;
1151 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1152
e3d6f909 1153 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1154 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1155 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1156 PR_REG_ISID_LEN);
1157 isid_ptr = &buf[0];
1158 }
1159
1160 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1161}
1162
1163static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1164{
1165 atomic_dec(&pr_reg->pr_res_holders);
1166 smp_mb__after_atomic_dec();
1167}
1168
1169static int core_scsi3_check_implict_release(
1170 struct se_device *dev,
1171 struct t10_pr_registration *pr_reg)
1172{
1173 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1174 struct t10_pr_registration *pr_res_holder;
1175 int ret = 0;
1176
1177 spin_lock(&dev->dev_reservation_lock);
1178 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1179 if (!pr_res_holder) {
c66ac9db
NB		 1180 spin_unlock(&dev->dev_reservation_lock);
1181 return ret;
1182 }
1183 if (pr_res_holder == pr_reg) {
1184 /*
1185 * Perform an implict RELEASE if the registration that
1186 * is being released is holding the reservation.
1187 *
1188 * From spc4r17, section 5.7.11.1:
1189 *
1190 * e) If the I_T nexus is the persistent reservation holder
1191 * and the persistent reservation is not an all registrants
1192 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1193 * service action or REGISTER AND IGNORE EXISTING KEY
1194 * service action with the SERVICE ACTION RESERVATION KEY
1195 * field set to zero (see 5.7.11.3).
1196 */
1197 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1198 ret = 1;
1199 /*
1200 * For 'All Registrants' reservation types, all existing
1201 * registrations are still processed as reservation holders
1202 * in core_scsi3_pr_seq_non_holder() after the initial
1203 * reservation holder is implictly released here.
1204 */
1205 } else if (pr_reg->pr_reg_all_tg_pt &&
1206 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1207 pr_reg->pr_reg_nacl->initiatorname)) &&
1208 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1209 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1210 " UNREGISTER while existing reservation with matching"
1211 " key 0x%016Lx is present from another SCSI Initiator"
1212 " Port\n", pr_reg->pr_res_key);
e3d6f909 1213 ret = -EPERM;
c66ac9db
NB		 1214 }
1215 spin_unlock(&dev->dev_reservation_lock);
1216
1217 return ret;
1218}
1219
1220/*
e3d6f909 1221 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1222 */
1223static void __core_scsi3_free_registration(
1224 struct se_device *dev,
1225 struct t10_pr_registration *pr_reg,
1226 struct list_head *preempt_and_abort_list,
1227 int dec_holders)
1228{
1229 struct target_core_fabric_ops *tfo =
1230 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1231 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1232 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1233
1234 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1235 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 1236
1237 pr_reg->pr_reg_deve->def_pr_registered = 0;
1238 pr_reg->pr_reg_deve->pr_res_key = 0;
1239 list_del(&pr_reg->pr_reg_list);
1240 /*
1241 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1242 * so call core_scsi3_put_pr_reg() to decrement our reference.
1243 */
1244 if (dec_holders)
1245 core_scsi3_put_pr_reg(pr_reg);
1246 /*
1247 * Wait until all reference from any other I_T nexuses for this
1248 * *pr_reg have been released. Because list_del() is called above,
1249 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1250 * count back to zero, and we release *pr_reg.
1251 */
1252 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1253 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1254 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1255 tfo->get_fabric_name());
1256 cpu_relax();
1257 spin_lock(&pr_tmpl->registration_lock);
1258 }
1259
6708bb27 1260 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1261 " Node: %s%s\n", tfo->get_fabric_name(),
1262 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1263 i_buf);
6708bb27 1264 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1265 " Port(s)\n", tfo->get_fabric_name(),
1266 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1267 dev->transport->name);
6708bb27 1268 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1269 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1270 pr_reg->pr_res_generation);
1271
6708bb27 1272 if (!preempt_and_abort_list) {
c66ac9db
NB		 1273 pr_reg->pr_reg_deve = NULL;
1274 pr_reg->pr_reg_nacl = NULL;
1275 kfree(pr_reg->pr_aptpl_buf);
1276 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1277 return;
1278 }
1279 /*
1280 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1281 * are released once the ABORT_TASK_SET has completed..
1282 */
1283 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1284}
1285
1286void core_scsi3_free_pr_reg_from_nacl(
1287 struct se_device *dev,
1288 struct se_node_acl *nacl)
1289{
0fd97ccf 1290 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1291 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1292 /*
1293 * If the passed se_node_acl matches the reservation holder,
1294 * release the reservation.
1295 */
1296 spin_lock(&dev->dev_reservation_lock);
1297 pr_res_holder = dev->dev_pr_res_holder;
1298 if ((pr_res_holder != NULL) &&
1299 (pr_res_holder->pr_reg_nacl == nacl))
1300 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1301 spin_unlock(&dev->dev_reservation_lock);
1302 /*
1303 * Release any registration associated with the struct se_node_acl.
1304 */
1305 spin_lock(&pr_tmpl->registration_lock);
1306 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1307 &pr_tmpl->registration_list, pr_reg_list) {
1308
1309 if (pr_reg->pr_reg_nacl != nacl)
1310 continue;
1311
1312 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1313 }
1314 spin_unlock(&pr_tmpl->registration_lock);
1315}
1316
1317void core_scsi3_free_all_registrations(
1318 struct se_device *dev)
1319{
0fd97ccf 1320 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1321 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1322
1323 spin_lock(&dev->dev_reservation_lock);
1324 pr_res_holder = dev->dev_pr_res_holder;
1325 if (pr_res_holder != NULL) {
1326 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1327 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1328 pr_res_holder, 0);
1329 }
1330 spin_unlock(&dev->dev_reservation_lock);
1331
1332 spin_lock(&pr_tmpl->registration_lock);
1333 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1334 &pr_tmpl->registration_list, pr_reg_list) {
1335
1336 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1337 }
1338 spin_unlock(&pr_tmpl->registration_lock);
1339
1340 spin_lock(&pr_tmpl->aptpl_reg_lock);
1341 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1342 pr_reg_aptpl_list) {
1343 list_del(&pr_reg->pr_reg_aptpl_list);
1344 kfree(pr_reg->pr_aptpl_buf);
1345 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1346 }
1347 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1348}
1349
1350static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1351{
e3d6f909 1352 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1353 &tpg->tpg_group.cg_item);
1354}
1355
1356static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1357{
e3d6f909 1358 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1359 &tpg->tpg_group.cg_item);
1360
1361 atomic_dec(&tpg->tpg_pr_ref_count);
1362 smp_mb__after_atomic_dec();
1363}
1364
1365static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1366{
1367 struct se_portal_group *tpg = nacl->se_tpg;
1368
1369 if (nacl->dynamic_node_acl)
1370 return 0;
1371
e3d6f909 1372 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1373 &nacl->acl_group.cg_item);
1374}
1375
1376static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1377{
1378 struct se_portal_group *tpg = nacl->se_tpg;
1379
1380 if (nacl->dynamic_node_acl) {
1381 atomic_dec(&nacl->acl_pr_ref_count);
1382 smp_mb__after_atomic_dec();
1383 return;
1384 }
1385
e3d6f909 1386 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1387 &nacl->acl_group.cg_item);
1388
1389 atomic_dec(&nacl->acl_pr_ref_count);
1390 smp_mb__after_atomic_dec();
1391}
1392
1393static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1394{
1395 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1396 struct se_node_acl *nacl;
1397 struct se_portal_group *tpg;
1398 /*
1399 * For nacl->dynamic_node_acl=1
1400 */
6708bb27 1401 if (!lun_acl)
c66ac9db
NB		 1402 return 0;
1403
1404 nacl = lun_acl->se_lun_nacl;
1405 tpg = nacl->se_tpg;
1406
e3d6f909 1407 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1408 &lun_acl->se_lun_group.cg_item);
1409}
1410
1411static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1412{
1413 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1414 struct se_node_acl *nacl;
1415 struct se_portal_group *tpg;
1416 /*
1417 * For nacl->dynamic_node_acl=1
1418 */
6708bb27 1419 if (!lun_acl) {
c66ac9db
NB		 1420 atomic_dec(&se_deve->pr_ref_count);
1421 smp_mb__after_atomic_dec();
1422 return;
1423 }
1424 nacl = lun_acl->se_lun_nacl;
1425 tpg = nacl->se_tpg;
1426
e3d6f909 1427 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1428 &lun_acl->se_lun_group.cg_item);
1429
1430 atomic_dec(&se_deve->pr_ref_count);
1431 smp_mb__after_atomic_dec();
1432}
1433
de103c93
CH		 1434static sense_reason_t
1435core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1436 struct se_cmd *cmd,
1437 struct se_portal_group *tpg,
1438 unsigned char *l_isid,
1439 u64 sa_res_key,
1440 int all_tg_pt,
1441 int aptpl)
1442{
5951146d 1443 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1444 struct se_port *tmp_port;
1445 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1446 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1447 struct se_node_acl *dest_node_acl = NULL;
1448 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1449 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1450 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1451 LIST_HEAD(tid_dest_list);
c66ac9db
NB		 1452 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1453 struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1454 unsigned char *buf;
c66ac9db
NB		 1455 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1456 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
de103c93 1457 sense_reason_t ret;
c66ac9db 1458 u32 tpdl, tid_len = 0;
d2843c17 1459 int dest_local_nexus;
c66ac9db
NB		 1460 u32 dest_rtpi = 0;
1461
1462 memset(dest_iport, 0, 64);
c66ac9db 1463
f2083241 1464 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1465 /*
1466 * Allocate a struct pr_transport_id_holder and setup the
1467 * local_node_acl and local_se_deve pointers and add to
1468 * struct list_head tid_dest_list for add registration
1469 * processing in the loop of tid_dest_list below.
1470 */
1471 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1472 if (!tidh_new) {
1473 pr_err("Unable to allocate tidh_new\n");
de103c93 1474 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1475 }
1476 INIT_LIST_HEAD(&tidh_new->dest_list);
1477 tidh_new->dest_tpg = tpg;
1478 tidh_new->dest_node_acl = se_sess->se_node_acl;
1479 tidh_new->dest_se_deve = local_se_deve;
1480
5951146d 1481 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1482 se_sess->se_node_acl, local_se_deve, l_isid,
1483 sa_res_key, all_tg_pt, aptpl);
6708bb27 1484 if (!local_pr_reg) {
c66ac9db 1485 kfree(tidh_new);
de103c93 1486 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1487 }
1488 tidh_new->dest_pr_reg = local_pr_reg;
1489 /*
1490 * The local I_T nexus does not hold any configfs dependances,
1491 * so we set tid_h->dest_local_nexus=1 to prevent the
1492 * configfs_undepend_item() calls in the tid_dest_list loops below.
1493 */
1494 tidh_new->dest_local_nexus = 1;
1495 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1496
0d7f1299
PB		 1497 if (cmd->data_length < 28) {
1498 pr_warn("SPC-PR: Received PR OUT parameter list"
1499 " length too small: %u\n", cmd->data_length);
de103c93 1500 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1501 goto out;
1502 }
1503
4949314c 1504 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1505 if (!buf) {
1506 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1507 goto out;
1508 }
1509
c66ac9db
NB		 1510 /*
1511 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1512 * first extract TransportID Parameter Data Length, and make sure
1513 * the value matches up to the SCSI expected data transfer length.
1514 */
1515 tpdl = (buf[24] & 0xff) << 24;
1516 tpdl |= (buf[25] & 0xff) << 16;
1517 tpdl |= (buf[26] & 0xff) << 8;
1518 tpdl |= buf[27] & 0xff;
1519
1520 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1521 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1522 " does not equal CDB data_length: %u\n", tpdl,
1523 cmd->data_length);
de103c93
CH		 1524 ret = TCM_INVALID_PARAMETER_LIST;
1525 goto out_unmap;
c66ac9db
NB		 1526 }
1527 /*
1528 * Start processing the received transport IDs using the
1529 * receiving I_T Nexus portal's fabric dependent methods to
1530 * obtain the SCSI Initiator Port/Device Identifiers.
1531 */
1532 ptr = &buf[28];
1533
1534 while (tpdl > 0) {
1535 proto_ident = (ptr[0] & 0x0f);
1536 dest_tpg = NULL;
1537
1538 spin_lock(&dev->se_port_lock);
1539 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1540 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1541 if (!tmp_tpg)
c66ac9db 1542 continue;
e3d6f909 1543 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1544 if (!tmp_tf_ops)
c66ac9db 1545 continue;
6708bb27
AG		 1546 if (!tmp_tf_ops->get_fabric_proto_ident ||
1547 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1548 continue;
1549 /*
1550 * Look for the matching proto_ident provided by
1551 * the received TransportID
1552 */
1553 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1554 if (tmp_proto_ident != proto_ident)
1555 continue;
1556 dest_rtpi = tmp_port->sep_rtpi;
1557
1558 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1559 tmp_tpg, (const char *)ptr, &tid_len,
1560 &iport_ptr);
6708bb27 1561 if (!i_str)
c66ac9db
NB		 1562 continue;
1563
1564 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1565 smp_mb__after_atomic_inc();
1566 spin_unlock(&dev->se_port_lock);
1567
de103c93 1568 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1569 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db
NB		 1570 " for tmp_tpg\n");
1571 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1572 smp_mb__after_atomic_dec();
de103c93
CH		 1573 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1574 goto out_unmap;
c66ac9db
NB		 1575 }
1576 /*
35d1efe8 1577 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1578 * from the decoded fabric module specific TransportID
1579 * at *i_str.
1580 */
28638887 1581 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1582 dest_node_acl = __core_tpg_get_initiator_node_acl(
1583 tmp_tpg, i_str);
1584 if (dest_node_acl) {
1585 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1586 smp_mb__after_atomic_inc();
1587 }
28638887 1588 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1589
6708bb27 1590 if (!dest_node_acl) {
c66ac9db
NB		 1591 core_scsi3_tpg_undepend_item(tmp_tpg);
1592 spin_lock(&dev->se_port_lock);
1593 continue;
1594 }
1595
de103c93 1596 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1597 pr_err("configfs_depend_item() failed"
c66ac9db
NB		 1598 " for dest_node_acl->acl_group\n");
1599 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1600 smp_mb__after_atomic_dec();
1601 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1602 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1603 goto out_unmap;
c66ac9db
NB		 1604 }
1605
1606 dest_tpg = tmp_tpg;
6708bb27 1607 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1608 " %s Port RTPI: %hu\n",
e3d6f909 1609 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1610 dest_node_acl->initiatorname, dest_rtpi);
1611
1612 spin_lock(&dev->se_port_lock);
1613 break;
1614 }
1615 spin_unlock(&dev->se_port_lock);
1616
6708bb27
AG		 1617 if (!dest_tpg) {
1618 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1619 " dest_tpg\n");
de103c93
CH		 1620 ret = TCM_INVALID_PARAMETER_LIST;
1621 goto out_unmap;
c66ac9db 1622 }
8b1e1244 1623
6708bb27 1624 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1625 " tid_len: %d for %s + %s\n",
e3d6f909 1626 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1627 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1628
c66ac9db 1629 if (tid_len > tpdl) {
6708bb27 1630 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1631 " %u for Transport ID: %s\n", tid_len, ptr);
1632 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1633 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1634 ret = TCM_INVALID_PARAMETER_LIST;
1635 goto out_unmap;
c66ac9db
NB		 1636 }
1637 /*
1638 * Locate the desintation struct se_dev_entry pointer for matching
1639 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1640 * Target Port.
1641 */
1642 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1643 dest_rtpi);
6708bb27
AG		 1644 if (!dest_se_deve) {
1645 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1646 " from destination RTPI: %hu\n",
e3d6f909 1647 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1648 dest_rtpi);
1649
1650 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1651 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1652 ret = TCM_INVALID_PARAMETER_LIST;
1653 goto out_unmap;
c66ac9db
NB		 1654 }
1655
de103c93 1656 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1657 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db
NB		 1658 " failed\n");
1659 atomic_dec(&dest_se_deve->pr_ref_count);
1660 smp_mb__after_atomic_dec();
1661 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1662 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1663 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1664 goto out_unmap;
c66ac9db 1665 }
8b1e1244 1666
6708bb27 1667 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1668 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1669 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1670 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1671
c66ac9db
NB		 1672 /*
1673 * Skip any TransportIDs that already have a registration for
1674 * this target port.
1675 */
1676 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1677 iport_ptr);
1678 if (pr_reg_e) {
1679 core_scsi3_put_pr_reg(pr_reg_e);
1680 core_scsi3_lunacl_undepend_item(dest_se_deve);
1681 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1682 core_scsi3_tpg_undepend_item(dest_tpg);
1683 ptr += tid_len;
1684 tpdl -= tid_len;
1685 tid_len = 0;
1686 continue;
1687 }
1688 /*
1689 * Allocate a struct pr_transport_id_holder and setup
1690 * the dest_node_acl and dest_se_deve pointers for the
1691 * loop below.
1692 */
1693 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1694 GFP_KERNEL);
6708bb27
AG		 1695 if (!tidh_new) {
1696 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1697 core_scsi3_lunacl_undepend_item(dest_se_deve);
1698 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1699 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1700 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1701 goto out_unmap;
c66ac9db
NB		 1702 }
1703 INIT_LIST_HEAD(&tidh_new->dest_list);
1704 tidh_new->dest_tpg = dest_tpg;
1705 tidh_new->dest_node_acl = dest_node_acl;
1706 tidh_new->dest_se_deve = dest_se_deve;
1707
1708 /*
1709 * Allocate, but do NOT add the registration for the
1710 * TransportID referenced SCSI Initiator port. This
1711 * done because of the following from spc4r17 in section
1712 * 6.14.3 wrt SPEC_I_PT:
1713 *
1714 * "If a registration fails for any initiator port (e.g., if th
1715 * logical unit does not have enough resources available to
1716 * hold the registration information), no registrations shall be
1717 * made, and the command shall be terminated with
1718 * CHECK CONDITION status."
1719 *
1720 * That means we call __core_scsi3_alloc_registration() here,
1721 * and then call __core_scsi3_add_registration() in the
1722 * 2nd loop which will never fail.
1723 */
5951146d 1724 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1725 dest_node_acl, dest_se_deve, iport_ptr,
1726 sa_res_key, all_tg_pt, aptpl);
6708bb27 1727 if (!dest_pr_reg) {
c66ac9db
NB		 1728 core_scsi3_lunacl_undepend_item(dest_se_deve);
1729 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1730 core_scsi3_tpg_undepend_item(dest_tpg);
1731 kfree(tidh_new);
de103c93
CH		 1732 ret = TCM_INVALID_PARAMETER_LIST;
1733 goto out_unmap;
c66ac9db
NB		 1734 }
1735 tidh_new->dest_pr_reg = dest_pr_reg;
1736 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1737
1738 ptr += tid_len;
1739 tpdl -= tid_len;
1740 tid_len = 0;
1741
1742 }
05d1c7c0 1743
4949314c 1744 transport_kunmap_data_sg(cmd);
05d1c7c0 1745
c66ac9db
NB		 1746 /*
1747 * Go ahead and create a registrations from tid_dest_list for the
1748 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1749 * and dest_se_deve.
1750 *
1751 * The SA Reservation Key from the PROUT is set for the
1752 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1753 * means that the TransportID Initiator port will be
1754 * registered on all of the target ports in the SCSI target device
1755 * ALL_TG_PT=0 means the registration will only be for the
1756 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1757 * was received.
1758 */
1759 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1760 dest_tpg = tidh->dest_tpg;
1761 dest_node_acl = tidh->dest_node_acl;
1762 dest_se_deve = tidh->dest_se_deve;
1763 dest_pr_reg = tidh->dest_pr_reg;
1764 dest_local_nexus = tidh->dest_local_nexus;
1765
1766 list_del(&tidh->dest_list);
1767 kfree(tidh);
1768
1769 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1770 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1771
5951146d 1772 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1773 dest_pr_reg, 0, 0);
1774
6708bb27 1775 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1776 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1777 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
d2843c17 1778 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
c66ac9db
NB		 1779
1780 if (dest_local_nexus)
1781 continue;
1782
1783 core_scsi3_lunacl_undepend_item(dest_se_deve);
1784 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1785 core_scsi3_tpg_undepend_item(dest_tpg);
1786 }
1787
1788 return 0;
de103c93 1789out_unmap:
4949314c 1790 transport_kunmap_data_sg(cmd);
de103c93 1791out:
c66ac9db
NB		 1792 /*
1793 * For the failure case, release everything from tid_dest_list
1794 * including *dest_pr_reg and the configfs dependances..
1795 */
1796 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1797 dest_tpg = tidh->dest_tpg;
1798 dest_node_acl = tidh->dest_node_acl;
1799 dest_se_deve = tidh->dest_se_deve;
1800 dest_pr_reg = tidh->dest_pr_reg;
1801 dest_local_nexus = tidh->dest_local_nexus;
1802
1803 list_del(&tidh->dest_list);
1804 kfree(tidh);
1805 /*
1806 * Release any extra ALL_TG_PT=1 registrations for
1807 * the SPEC_I_PT=1 case.
1808 */
1809 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1810 &dest_pr_reg->pr_reg_atp_list,
1811 pr_reg_atp_mem_list) {
1812 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1813 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1814 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1815 }
1816
1817 kfree(dest_pr_reg->pr_aptpl_buf);
1818 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1819
1820 if (dest_local_nexus)
1821 continue;
1822
1823 core_scsi3_lunacl_undepend_item(dest_se_deve);
1824 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1825 core_scsi3_tpg_undepend_item(dest_tpg);
1826 }
1827 return ret;
1828}
1829
3c8a6228 1830static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1831 struct se_device *dev,
1832 unsigned char *buf,
0607decd 1833 u32 pr_aptpl_buf_len)
c66ac9db
NB		 1834{
1835 struct se_lun *lun;
1836 struct se_portal_group *tpg;
c66ac9db
NB		 1837 struct t10_pr_registration *pr_reg;
1838 unsigned char tmp[512], isid_buf[32];
1839 ssize_t len = 0;
1840 int reg_count = 0;
3c8a6228 1841 int ret = 0;
c66ac9db
NB		 1842
1843 memset(buf, 0, pr_aptpl_buf_len);
0607decd 1844
3c8a6228
AG		 1845 spin_lock(&dev->dev_reservation_lock);
1846 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1847 /*
1848 * Walk the registration list..
1849 */
0fd97ccf 1850 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1851 pr_reg_list) {
1852
1853 tmp[0] = '\0';
1854 isid_buf[0] = '\0';
1855 tpg = pr_reg->pr_reg_nacl->se_tpg;
1856 lun = pr_reg->pr_reg_tg_pt_lun;
1857 /*
1858 * Write out any ISID value to APTPL metadata that was included
1859 * in the original registration.
1860 */
1861 if (pr_reg->isid_present_at_reg)
1862 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1863 pr_reg->pr_reg_isid);
1864 /*
1865 * Include special metadata if the pr_reg matches the
1866 * reservation holder.
1867 */
1868 if (dev->dev_pr_res_holder == pr_reg) {
1869 snprintf(tmp, 512, "PR_REG_START: %d"
1870 "\ninitiator_fabric=%s\n"
1871 "initiator_node=%s\n%s"
1872 "sa_res_key=%llu\n"
1873 "res_holder=1\nres_type=%02x\n"
1874 "res_scope=%02x\nres_all_tg_pt=%d\n"
1875 "mapped_lun=%u\n", reg_count,
e3d6f909 1876 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1877 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1878 pr_reg->pr_res_key, pr_reg->pr_res_type,
1879 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1880 pr_reg->pr_res_mapped_lun);
1881 } else {
1882 snprintf(tmp, 512, "PR_REG_START: %d\n"
1883 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1884 "sa_res_key=%llu\nres_holder=0\n"
1885 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1886 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1887 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1888 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1889 pr_reg->pr_res_mapped_lun);
1890 }
1891
60d645a4 1892 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1893 pr_err("Unable to update renaming"
c66ac9db 1894 " APTPL metadata\n");
3c8a6228
AG		 1895 ret = -EMSGSIZE;
1896 goto out;
c66ac9db
NB		 1897 }
1898 len += sprintf(buf+len, "%s", tmp);
1899
1900 /*
1901 * Include information about the associated SCSI target port.
1902 */
1903 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1904 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1905 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1906 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1907 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1908 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1909
60d645a4 1910 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1911 pr_err("Unable to update renaming"
c66ac9db 1912 " APTPL metadata\n");
3c8a6228
AG		 1913 ret = -EMSGSIZE;
1914 goto out;
c66ac9db
NB		 1915 }
1916 len += sprintf(buf+len, "%s", tmp);
1917 reg_count++;
1918 }
c66ac9db 1919
6708bb27 1920 if (!reg_count)
c66ac9db
NB		 1921 len += sprintf(buf+len, "No Registrations or Reservations");
1922
3c8a6228
AG		 1923out:
1924 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1925 spin_unlock(&dev->dev_reservation_lock);
1926
1927 return ret;
1928}
1929
1930/*
1931 * Called with struct se_device->aptpl_file_mutex held
1932 */
1933static int __core_scsi3_write_aptpl_to_file(
1934 struct se_device *dev,
1935 unsigned char *buf,
1936 u32 pr_aptpl_buf_len)
1937{
0fd97ccf 1938 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1939 struct file *file;
c66ac9db
NB		 1940 int flags = O_RDWR | O_CREAT | O_TRUNC;
1941 char path[512];
1942 int ret;
1943
c66ac9db
NB		 1944 memset(path, 0, 512);
1945
60d645a4 1946 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1947 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1948 " into path buffer\n");
e3d6f909 1949 return -EMSGSIZE;
c66ac9db
NB		 1950 }
1951
1952 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1953 file = filp_open(path, flags, 0600);
0e9b10a9 1954 if (IS_ERR(file)) {
6708bb27 1955 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1956 " failed\n", path);
0e9b10a9 1957 return PTR_ERR(file);
c66ac9db
NB		 1958 }
1959
6708bb27 1960 if (!pr_aptpl_buf_len)
0e9b10a9 1961 pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
c66ac9db 1962
0e9b10a9 1963 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1964
0e9b10a9 1965 if (ret < 0)
6708bb27 1966 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1967 fput(file);
c66ac9db 1968
0e9b10a9 1969 return ret ? -EIO : 0;
c66ac9db
NB		 1970}
1971
de103c93
CH		 1972static int
1973core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf,
1974 u32 in_pr_aptpl_buf_len)
c66ac9db
NB		 1975{
1976 unsigned char null_buf[64], *buf;
de103c93
CH		 1977 int ret;
1978
c66ac9db
NB		 1979 /*
1980 * Can be called with a NULL pointer from PROUT service action CLEAR
1981 */
6708bb27 1982 if (!in_buf) {
0607decd
AG		 1983 snprintf(null_buf, 64, "No Registrations or Reservations\n");
1984 buf = null_buf;
c66ac9db 1985 } else {
0607decd
AG		 1986 ret = core_scsi3_update_aptpl_buf(dev, in_buf, in_pr_aptpl_buf_len);
1987 if (ret != 0)
1988 return ret;
c66ac9db 1989 buf = in_buf;
c66ac9db
NB		 1990 }
1991
c66ac9db
NB		 1992 /*
1993 * __core_scsi3_write_aptpl_to_file() will call strlen()
1994 * on the passed buf to determine pr_aptpl_buf_len.
1995 */
de103c93 1996 return __core_scsi3_write_aptpl_to_file(dev, buf, 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,
33ce6a87 2001 int aptpl, int all_tg_pt, int 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
NB		 2007 struct se_portal_group *se_tpg;
2008 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
0fd97ccf 2009 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2010 /* Used for APTPL metadata w/ UNREGISTER */
2011 unsigned char *pr_aptpl_buf = NULL;
2012 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2013 sense_reason_t ret = TCM_NO_SENSE;
de103c93 2014 int pr_holder = 0, type;
c66ac9db 2015
6708bb27
AG		 2016 if (!se_sess || !se_lun) {
2017 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2018 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2019 }
2020 se_tpg = se_sess->se_tpg;
f2083241 2021 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2022
e3d6f909 2023 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2024 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2025 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2026 PR_REG_ISID_LEN);
2027 isid_ptr = &isid_buf[0];
2028 }
2029 /*
2030 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2031 */
2032 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27 2033 if (!pr_reg_e) {
c66ac9db 2034 if (res_key) {
6708bb27 2035 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2036 " for SA REGISTER, returning CONFLICT\n");
de103c93 2037 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2038 }
2039 /*
2040 * Do nothing but return GOOD status.
2041 */
6708bb27 2042 if (!sa_res_key)
03e98c9e 2043 return 0;
c66ac9db 2044
6708bb27 2045 if (!spec_i_pt) {
c66ac9db
NB		 2046 /*
2047 * Perform the Service Action REGISTER on the Initiator
2048 * Port Endpoint that the PRO was received from on the
2049 * Logical Unit of the SCSI device server.
2050 */
de103c93 2051 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2052 se_sess->se_node_acl, se_deve, isid_ptr,
2053 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2054 register_type, 0)) {
6708bb27 2055 pr_err("Unable to allocate"
c66ac9db 2056 " struct t10_pr_registration\n");
de103c93 2057 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2058 }
2059 } else {
2060 /*
2061 * Register both the Initiator port that received
2062 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2063 * TransportID from Parameter list and loop through
2064 * fabric dependent parameter list while calling
2065 * logic from of core_scsi3_alloc_registration() for
2066 * each TransportID provided SCSI Initiator Port/Device
2067 */
2068 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2069 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2070 if (ret != 0)
2071 return ret;
2072 }
2073 /*
2074 * Nothing left to do for the APTPL=0 case.
2075 */
6708bb27 2076 if (!aptpl) {
c66ac9db 2077 pr_tmpl->pr_aptpl_active = 0;
5951146d 2078 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 2079 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
c66ac9db
NB		 2080 " REGISTER\n");
2081 return 0;
2082 }
2083 /*
2084 * Locate the newly allocated local I_T Nexus *pr_reg, and
2085 * update the APTPL metadata information using its
2086 * preallocated *pr_reg->pr_aptpl_buf.
2087 */
5951146d 2088 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db
NB		 2089 se_sess->se_node_acl, se_sess);
2090
de103c93 2091 if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 2092 pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
c66ac9db 2093 pr_tmpl->pr_aptpl_active = 1;
6708bb27 2094 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
c66ac9db
NB		 2095 }
2096
de103c93
CH		 2097 goto out_put_pr_reg;
2098 }
2099
2100 /*
2101 * Locate the existing *pr_reg via struct se_node_acl pointers
2102 */
2103 pr_reg = pr_reg_e;
2104 type = pr_reg->pr_res_type;
2105
33ce6a87 2106 if (register_type == REGISTER) {
de103c93
CH		 2107 if (res_key != pr_reg->pr_res_key) {
2108 pr_err("SPC-3 PR REGISTER: Received"
2109 " res_key: 0x%016Lx does not match"
2110 " existing SA REGISTER res_key:"
2111 " 0x%016Lx\n", res_key,
2112 pr_reg->pr_res_key);
2113 ret = TCM_RESERVATION_CONFLICT;
2114 goto out_put_pr_reg;
c66ac9db 2115 }
de103c93
CH		 2116 }
2117
2118 if (spec_i_pt) {
1f070cc2
AG		 2119 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2120 " set on a registered nexus\n");
de103c93
CH		 2121 ret = TCM_INVALID_PARAMETER_LIST;
2122 goto out_put_pr_reg;
2123 }
2124
2125 /*
2126 * An existing ALL_TG_PT=1 registration being released
2127 * must also set ALL_TG_PT=1 in the incoming PROUT.
2128 */
1f070cc2
AG		 2129 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2130 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2131 " registration exists, but ALL_TG_PT=1 bit not"
2132 " present in received PROUT\n");
2133 ret = TCM_INVALID_CDB_FIELD;
2134 goto out_put_pr_reg;
2135 }
2136
2137 /*
2138 * Allocate APTPL metadata buffer used for UNREGISTER ops
2139 */
2140 if (aptpl) {
4e529be2 2141 pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
de103c93
CH		 2142 if (!pr_aptpl_buf) {
2143 pr_err("Unable to allocate"
2144 " pr_aptpl_buf\n");
2145 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2146 goto out_put_pr_reg;
c66ac9db 2147 }
de103c93
CH		 2148 }
2149
2150 /*
2151 * sa_res_key=0 Unregister Reservation Key for registered I_T
2152 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2153 * Nexus.
2154 */
2155 if (!sa_res_key) {
2156 pr_holder = core_scsi3_check_implict_release(
2157 cmd->se_dev, pr_reg);
2158 if (pr_holder < 0) {
2159 kfree(pr_aptpl_buf);
2160 ret = TCM_RESERVATION_CONFLICT;
2161 goto out_put_pr_reg;
c66ac9db 2162 }
de103c93
CH		 2163
2164 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2165 /*
de103c93
CH		 2166 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2167 * and matching pr_res_key.
c66ac9db 2168 */
de103c93
CH		 2169 if (pr_reg->pr_reg_all_tg_pt) {
2170 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2171 &pr_tmpl->registration_list,
2172 pr_reg_list) {
2173
2174 if (!pr_reg_p->pr_reg_all_tg_pt)
2175 continue;
2176 if (pr_reg_p->pr_res_key != res_key)
2177 continue;
2178 if (pr_reg == pr_reg_p)
2179 continue;
2180 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2181 pr_reg_p->pr_reg_nacl->initiatorname))
2182 continue;
2183
2184 __core_scsi3_free_registration(dev,
2185 pr_reg_p, NULL, 0);
c66ac9db
NB		 2186 }
2187 }
de103c93 2188
c66ac9db 2189 /*
de103c93 2190 * Release the calling I_T Nexus registration now..
c66ac9db 2191 */
de103c93 2192 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
c66ac9db 2193
de103c93
CH		 2194 /*
2195 * From spc4r17, section 5.7.11.3 Unregistering
2196 *
2197 * If the persistent reservation is a registrants only
2198 * type, the device server shall establish a unit
2199 * attention condition for the initiator port associated
2200 * with every registered I_T nexus except for the I_T
2201 * nexus on which the PERSISTENT RESERVE OUT command was
2202 * received, with the additional sense code set to
2203 * RESERVATIONS RELEASED.
2204 */
2205 if (pr_holder &&
2206 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2207 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2208 list_for_each_entry(pr_reg_p,
2209 &pr_tmpl->registration_list,
2210 pr_reg_list) {
2211
2212 core_scsi3_ua_allocate(
2213 pr_reg_p->pr_reg_nacl,
2214 pr_reg_p->pr_res_mapped_lun,
2215 0x2A,
2216 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2217 }
de103c93
CH		 2218 }
2219 spin_unlock(&pr_tmpl->registration_lock);
c66ac9db 2220
de103c93
CH		 2221 if (!aptpl) {
2222 pr_tmpl->pr_aptpl_active = 0;
2223 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2224 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2225 " for UNREGISTER\n");
2226 return 0;
2227 }
c66ac9db 2228
4e529be2 2229 if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
de103c93
CH		 2230 pr_tmpl->pr_aptpl_active = 1;
2231 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2232 " for UNREGISTER\n");
2233 }
c66ac9db 2234
de103c93
CH		 2235 goto out_free_aptpl_buf;
2236 }
c66ac9db 2237
de103c93
CH		 2238 /*
2239 * Increment PRgeneration counter for struct se_device"
2240 * upon a successful REGISTER, see spc4r17 section 6.3.2
2241 * READ_KEYS service action.
2242 */
2243 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2244 pr_reg->pr_res_key = sa_res_key;
2245 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2246 " Key for %s to: 0x%016Lx PRgeneration:"
2247 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
33ce6a87 2248 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
de103c93
CH		 2249 pr_reg->pr_reg_nacl->initiatorname,
2250 pr_reg->pr_res_key, pr_reg->pr_res_generation);
c66ac9db 2251
de103c93
CH		 2252 if (!aptpl) {
2253 pr_tmpl->pr_aptpl_active = 0;
2254 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2255 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2256 " for REGISTER\n");
2257 ret = 0;
2258 goto out_put_pr_reg;
c66ac9db 2259 }
de103c93 2260
4e529be2 2261 if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
de103c93
CH		 2262 pr_tmpl->pr_aptpl_active = 1;
2263 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2264 " for REGISTER\n");
2265 }
2266
2267out_free_aptpl_buf:
2268 kfree(pr_aptpl_buf);
2269 ret = 0;
2270out_put_pr_reg:
2271 core_scsi3_put_pr_reg(pr_reg);
2272 return ret;
c66ac9db
NB		 2273}
2274
2275unsigned char *core_scsi3_pr_dump_type(int type)
2276{
2277 switch (type) {
2278 case PR_TYPE_WRITE_EXCLUSIVE:
2279 return "Write Exclusive Access";
2280 case PR_TYPE_EXCLUSIVE_ACCESS:
2281 return "Exclusive Access";
2282 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2283 return "Write Exclusive Access, Registrants Only";
2284 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2285 return "Exclusive Access, Registrants Only";
2286 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2287 return "Write Exclusive Access, All Registrants";
2288 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2289 return "Exclusive Access, All Registrants";
2290 default:
2291 break;
2292 }
2293
2294 return "Unknown SPC-3 PR Type";
2295}
2296
de103c93
CH		 2297static sense_reason_t
2298core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2299{
de103c93 2300 struct se_device *dev = cmd->se_dev;
e3d6f909 2301 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2302 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2303 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2304 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2305 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2306 sense_reason_t ret;
c66ac9db
NB		 2307
2308 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2309
6708bb27
AG		 2310 if (!se_sess || !se_lun) {
2311 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2312 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2313 }
c66ac9db
NB		 2314 /*
2315 * Locate the existing *pr_reg via struct se_node_acl pointers
2316 */
5951146d 2317 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2318 se_sess);
6708bb27
AG		 2319 if (!pr_reg) {
2320 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2321 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2322 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2323 }
2324 /*
2325 * From spc4r17 Section 5.7.9: Reserving:
2326 *
2327 * An application client creates a persistent reservation by issuing
2328 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2329 * a registered I_T nexus with the following parameters:
2330 * a) RESERVATION KEY set to the value of the reservation key that is
2331 * registered with the logical unit for the I_T nexus; and
2332 */
2333 if (res_key != pr_reg->pr_res_key) {
6708bb27 2334 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2335 " does not match existing SA REGISTER res_key:"
2336 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2337 ret = TCM_RESERVATION_CONFLICT;
2338 goto out_put_pr_reg;
c66ac9db
NB		 2339 }
2340 /*
2341 * From spc4r17 Section 5.7.9: Reserving:
2342 *
2343 * From above:
2344 * b) TYPE field and SCOPE field set to the persistent reservation
2345 * being created.
2346 *
2347 * Only one persistent reservation is allowed at a time per logical unit
2348 * and that persistent reservation has a scope of LU_SCOPE.
2349 */
2350 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2351 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2352 ret = TCM_INVALID_PARAMETER_LIST;
2353 goto out_put_pr_reg;
c66ac9db
NB		 2354 }
2355 /*
2356 * See if we have an existing PR reservation holder pointer at
2357 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2358 * *pr_res_holder.
2359 */
2360 spin_lock(&dev->dev_reservation_lock);
2361 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2362 if (pr_res_holder) {
c66ac9db
NB		 2363 /*
2364 * From spc4r17 Section 5.7.9: Reserving:
2365 *
2366 * If the device server receives a PERSISTENT RESERVE OUT
2367 * command from an I_T nexus other than a persistent reservation
2368 * holder (see 5.7.10) that attempts to create a persistent
2369 * reservation when a persistent reservation already exists for
2370 * the logical unit, then the command shall be completed with
2371 * RESERVATION CONFLICT status.
2372 */
2373 if (pr_res_holder != pr_reg) {
2374 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2375 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2376 " [%s]: %s while reservation already held by"
2377 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2378 cmd->se_tfo->get_fabric_name(),
c66ac9db 2379 se_sess->se_node_acl->initiatorname,
e3d6f909 2380 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2381 pr_res_holder->pr_reg_nacl->initiatorname);
2382
2383 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2384 ret = TCM_RESERVATION_CONFLICT;
2385 goto out_put_pr_reg;
c66ac9db
NB		 2386 }
2387 /*
2388 * From spc4r17 Section 5.7.9: Reserving:
2389 *
2390 * If a persistent reservation holder attempts to modify the
2391 * type or scope of an existing persistent reservation, the
2392 * command shall be completed with RESERVATION CONFLICT status.
2393 */
2394 if ((pr_res_holder->pr_res_type != type) ||
2395 (pr_res_holder->pr_res_scope != scope)) {
2396 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2397 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2398 " [%s]: %s trying to change TYPE and/or SCOPE,"
2399 " while reservation already held by [%s]: %s,"
2400 " returning RESERVATION_CONFLICT\n",
e3d6f909 2401 cmd->se_tfo->get_fabric_name(),
c66ac9db 2402 se_sess->se_node_acl->initiatorname,
e3d6f909 2403 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2404 pr_res_holder->pr_reg_nacl->initiatorname);
2405
2406 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2407 ret = TCM_RESERVATION_CONFLICT;
2408 goto out_put_pr_reg;
c66ac9db
NB		 2409 }
2410 /*
2411 * From spc4r17 Section 5.7.9: Reserving:
2412 *
2413 * If the device server receives a PERSISTENT RESERVE OUT
2414 * command with RESERVE service action where the TYPE field and
2415 * the SCOPE field contain the same values as the existing type
2416 * and scope from a persistent reservation holder, it shall not
2417 * make any change to the existing persistent reservation and
2418 * shall completethe command with GOOD status.
2419 */
2420 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2421 ret = 0;
2422 goto out_put_pr_reg;
c66ac9db
NB		 2423 }
2424 /*
2425 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2426 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2427 */
2428 pr_reg->pr_res_scope = scope;
2429 pr_reg->pr_res_type = type;
2430 pr_reg->pr_res_holder = 1;
2431 dev->dev_pr_res_holder = pr_reg;
d2843c17 2432 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2433
6708bb27 2434 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2435 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2436 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2437 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2438 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2439 cmd->se_tfo->get_fabric_name(),
c66ac9db 2440 se_sess->se_node_acl->initiatorname,
d2843c17 2441 i_buf);
c66ac9db
NB		 2442 spin_unlock(&dev->dev_reservation_lock);
2443
2444 if (pr_tmpl->pr_aptpl_active) {
de103c93 2445 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 2446 pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
6708bb27 2447 pr_debug("SPC-3 PR: Updated APTPL metadata"
c66ac9db 2448 " for RESERVE\n");
de103c93 2449 }
c66ac9db
NB		 2450 }
2451
de103c93
CH		 2452 ret = 0;
2453out_put_pr_reg:
c66ac9db 2454 core_scsi3_put_pr_reg(pr_reg);
de103c93 2455 return ret;
c66ac9db
NB		 2456}
2457
de103c93
CH		 2458static sense_reason_t
2459core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2460 u64 res_key)
c66ac9db 2461{
c66ac9db
NB		 2462 switch (type) {
2463 case PR_TYPE_WRITE_EXCLUSIVE:
2464 case PR_TYPE_EXCLUSIVE_ACCESS:
2465 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2466 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2467 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2468 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2469 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2470 default:
6708bb27 2471 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2472 " 0x%02x\n", type);
de103c93 2473 return TCM_INVALID_CDB_FIELD;
c66ac9db 2474 }
c66ac9db
NB		 2475}
2476
2477/*
2478 * Called with struct se_device->dev_reservation_lock held.
2479 */
2480static void __core_scsi3_complete_pro_release(
2481 struct se_device *dev,
2482 struct se_node_acl *se_nacl,
2483 struct t10_pr_registration *pr_reg,
2484 int explict)
2485{
2486 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2487 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2488
2489 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2490 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2491 /*
2492 * Go ahead and release the current PR reservation holder.
2493 */
2494 dev->dev_pr_res_holder = NULL;
2495
6708bb27 2496 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
c66ac9db
NB		 2497 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2498 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2499 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2500 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2501 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2502 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2503 i_buf);
c66ac9db
NB		 2504 /*
2505 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2506 */
2507 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2508}
2509
de103c93
CH		 2510static sense_reason_t
2511core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2512 u64 res_key)
c66ac9db
NB		 2513{
2514 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2515 struct se_session *se_sess = cmd->se_sess;
2516 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2517 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2518 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93
CH		 2519 int all_reg = 0;
2520 sense_reason_t ret = 0;
c66ac9db 2521
6708bb27
AG		 2522 if (!se_sess || !se_lun) {
2523 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2524 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2525 }
2526 /*
2527 * Locate the existing *pr_reg via struct se_node_acl pointers
2528 */
2529 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2530 if (!pr_reg) {
2531 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2532 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2533 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2534 }
2535 /*
2536 * From spc4r17 Section 5.7.11.2 Releasing:
2537 *
2538 * If there is no persistent reservation or in response to a persistent
2539 * reservation release request from a registered I_T nexus that is not a
2540 * persistent reservation holder (see 5.7.10), the device server shall
2541 * do the following:
2542 *
2543 * a) Not release the persistent reservation, if any;
2544 * b) Not remove any registrations; and
2545 * c) Complete the command with GOOD status.
2546 */
2547 spin_lock(&dev->dev_reservation_lock);
2548 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2549 if (!pr_res_holder) {
c66ac9db
NB		 2550 /*
2551 * No persistent reservation, return GOOD status.
2552 */
2553 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2554 goto out_put_pr_reg;
c66ac9db
NB		 2555 }
2556 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2557 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2558 all_reg = 1;
2559
2560 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2561 /*
2562 * Non 'All Registrants' PR Type cases..
2563 * Release request from a registered I_T nexus that is not a
2564 * persistent reservation holder. return GOOD status.
2565 */
2566 spin_unlock(&dev->dev_reservation_lock);
de103c93 2567 goto out_put_pr_reg;
c66ac9db 2568 }
de103c93 2569
c66ac9db
NB		 2570 /*
2571 * From spc4r17 Section 5.7.11.2 Releasing:
2572 *
2573 * Only the persistent reservation holder (see 5.7.10) is allowed to
2574 * release a persistent reservation.
2575 *
2576 * An application client releases the persistent reservation by issuing
2577 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2578 * an I_T nexus that is a persistent reservation holder with the
2579 * following parameters:
2580 *
2581 * a) RESERVATION KEY field set to the value of the reservation key
2582 * that is registered with the logical unit for the I_T nexus;
2583 */
2584 if (res_key != pr_reg->pr_res_key) {
6708bb27 2585 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2586 " does not match existing SA REGISTER res_key:"
2587 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2588 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2589 ret = TCM_RESERVATION_CONFLICT;
2590 goto out_put_pr_reg;
c66ac9db
NB		 2591 }
2592 /*
2593 * From spc4r17 Section 5.7.11.2 Releasing and above:
2594 *
2595 * b) TYPE field and SCOPE field set to match the persistent
2596 * reservation being released.
2597 */
2598 if ((pr_res_holder->pr_res_type != type) ||
2599 (pr_res_holder->pr_res_scope != scope)) {
2600 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2601 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2602 " reservation from [%s]: %s with different TYPE "
2603 "and/or SCOPE while reservation already held by"
2604 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2605 cmd->se_tfo->get_fabric_name(),
c66ac9db 2606 se_sess->se_node_acl->initiatorname,
e3d6f909 2607 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2608 pr_res_holder->pr_reg_nacl->initiatorname);
2609
2610 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2611 ret = TCM_RESERVATION_CONFLICT;
2612 goto out_put_pr_reg;
c66ac9db
NB		 2613 }
2614 /*
2615 * In response to a persistent reservation release request from the
2616 * persistent reservation holder the device server shall perform a
2617 * release by doing the following as an uninterrupted series of actions:
2618 * a) Release the persistent reservation;
2619 * b) Not remove any registration(s);
2620 * c) If the released persistent reservation is a registrants only type
2621 * or all registrants type persistent reservation,
2622 * the device server shall establish a unit attention condition for
2623 * the initiator port associated with every regis-
2624 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2625 * RESERVE OUT command with RELEASE service action was received,
2626 * with the additional sense code set to RESERVATIONS RELEASED; and
2627 * d) If the persistent reservation is of any other type, the device
2628 * server shall not establish a unit attention condition.
2629 */
2630 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2631 pr_reg, 1);
2632
2633 spin_unlock(&dev->dev_reservation_lock);
2634
2635 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2636 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2637 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2638 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2639 /*
2640 * If no UNIT ATTENTION conditions will be established for
2641 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2642 * go ahead and check for APTPL=1 update+write below
2643 */
2644 goto write_aptpl;
2645 }
2646
2647 spin_lock(&pr_tmpl->registration_lock);
2648 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2649 pr_reg_list) {
2650 /*
2651 * Do not establish a UNIT ATTENTION condition
2652 * for the calling I_T Nexus
2653 */
2654 if (pr_reg_p == pr_reg)
2655 continue;
2656
2657 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2658 pr_reg_p->pr_res_mapped_lun,
2659 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2660 }
2661 spin_unlock(&pr_tmpl->registration_lock);
2662
2663write_aptpl:
2664 if (pr_tmpl->pr_aptpl_active) {
de103c93 2665 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 2666 pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
6708bb27 2667 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
de103c93 2668 }
c66ac9db 2669 }
de103c93 2670out_put_pr_reg:
c66ac9db 2671 core_scsi3_put_pr_reg(pr_reg);
de103c93 2672 return ret;
c66ac9db
NB		 2673}
2674
de103c93
CH		 2675static sense_reason_t
2676core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2677{
2678 struct se_device *dev = cmd->se_dev;
2679 struct se_node_acl *pr_reg_nacl;
e3d6f909 2680 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2681 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2682 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2683 u32 pr_res_mapped_lun = 0;
2684 int calling_it_nexus = 0;
2685 /*
2686 * Locate the existing *pr_reg via struct se_node_acl pointers
2687 */
5951146d 2688 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2689 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2690 if (!pr_reg_n) {
2691 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2692 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2693 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2694 }
2695 /*
2696 * From spc4r17 section 5.7.11.6, Clearing:
2697 *
2698 * Any application client may release the persistent reservation and
2699 * remove all registrations from a device server by issuing a
2700 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2701 * registered I_T nexus with the following parameter:
2702 *
2703 * a) RESERVATION KEY field set to the value of the reservation key
2704 * that is registered with the logical unit for the I_T nexus.
2705 */
2706 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2707 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2708 " res_key: 0x%016Lx does not match"
2709 " existing SA REGISTER res_key:"
2710 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2711 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2712 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2713 }
2714 /*
2715 * a) Release the persistent reservation, if any;
2716 */
2717 spin_lock(&dev->dev_reservation_lock);
2718 pr_res_holder = dev->dev_pr_res_holder;
2719 if (pr_res_holder) {
2720 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2721 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2722 pr_res_holder, 0);
2723 }
2724 spin_unlock(&dev->dev_reservation_lock);
2725 /*
2726 * b) Remove all registration(s) (see spc4r17 5.7.7);
2727 */
2728 spin_lock(&pr_tmpl->registration_lock);
2729 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2730 &pr_tmpl->registration_list, pr_reg_list) {
2731
2732 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2733 pr_reg_nacl = pr_reg->pr_reg_nacl;
2734 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2735 __core_scsi3_free_registration(dev, pr_reg, NULL,
2736 calling_it_nexus);
2737 /*
2738 * e) Establish a unit attention condition for the initiator
2739 * port associated with every registered I_T nexus other
2740 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2741 * command with CLEAR service action was received, with the
2742 * additional sense code set to RESERVATIONS PREEMPTED.
2743 */
6708bb27 2744 if (!calling_it_nexus)
c66ac9db
NB		 2745 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2746 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2747 }
2748 spin_unlock(&pr_tmpl->registration_lock);
2749
6708bb27 2750 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2751 cmd->se_tfo->get_fabric_name());
c66ac9db
NB		 2752
2753 if (pr_tmpl->pr_aptpl_active) {
5951146d 2754 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 2755 pr_debug("SPC-3 PR: Updated APTPL metadata"
c66ac9db
NB		 2756 " for CLEAR\n");
2757 }
2758
2759 core_scsi3_pr_generation(dev);
2760 return 0;
2761}
2762
2763/*
2764 * Called with struct se_device->dev_reservation_lock held.
2765 */
2766static void __core_scsi3_complete_pro_preempt(
2767 struct se_device *dev,
2768 struct t10_pr_registration *pr_reg,
2769 struct list_head *preempt_and_abort_list,
2770 int type,
2771 int scope,
33ce6a87 2772 enum preempt_type preempt_type)
c66ac9db
NB		 2773{
2774 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2775 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2776 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2777
2778 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2779 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2780 /*
2781 * Do an implict RELEASE of the existing reservation.
2782 */
2783 if (dev->dev_pr_res_holder)
2784 __core_scsi3_complete_pro_release(dev, nacl,
2785 dev->dev_pr_res_holder, 0);
2786
2787 dev->dev_pr_res_holder = pr_reg;
2788 pr_reg->pr_res_holder = 1;
2789 pr_reg->pr_res_type = type;
2790 pr_reg->pr_res_scope = scope;
2791
6708bb27 2792 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2793 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2794 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2795 core_scsi3_pr_dump_type(type),
2796 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2797 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2798 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2799 nacl->initiatorname, i_buf);
c66ac9db
NB		 2800 /*
2801 * For PREEMPT_AND_ABORT, add the preempting reservation's
2802 * struct t10_pr_registration to the list that will be compared
2803 * against received CDBs..
2804 */
2805 if (preempt_and_abort_list)
2806 list_add_tail(&pr_reg->pr_reg_abort_list,
2807 preempt_and_abort_list);
2808}
2809
2810static void core_scsi3_release_preempt_and_abort(
2811 struct list_head *preempt_and_abort_list,
2812 struct t10_pr_registration *pr_reg_holder)
2813{
2814 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2815
2816 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2817 pr_reg_abort_list) {
2818
2819 list_del(&pr_reg->pr_reg_abort_list);
2820 if (pr_reg_holder == pr_reg)
2821 continue;
2822 if (pr_reg->pr_res_holder) {
6708bb27 2823 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2824 continue;
2825 }
2826
2827 pr_reg->pr_reg_deve = NULL;
2828 pr_reg->pr_reg_nacl = NULL;
2829 kfree(pr_reg->pr_aptpl_buf);
2830 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2831 }
2832}
2833
de103c93
CH		 2834static sense_reason_t
2835core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2836 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2837{
5951146d 2838 struct se_device *dev = cmd->se_dev;
c66ac9db 2839 struct se_node_acl *pr_reg_nacl;
e3d6f909 2840 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2841 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2842 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2843 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2844 u32 pr_res_mapped_lun = 0;
2845 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
de103c93 2846 int prh_type = 0, prh_scope = 0;
c66ac9db 2847
de103c93
CH		 2848 if (!se_sess)
2849 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2850
5951146d 2851 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2852 se_sess);
6708bb27
AG		 2853 if (!pr_reg_n) {
2854 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2855 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2856 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2857 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2858 }
2859 if (pr_reg_n->pr_res_key != res_key) {
2860 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2861 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2862 }
2863 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2864 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2865 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2866 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2867 }
c66ac9db
NB		 2868
2869 spin_lock(&dev->dev_reservation_lock);
2870 pr_res_holder = dev->dev_pr_res_holder;
2871 if (pr_res_holder &&
2872 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2873 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2874 all_reg = 1;
2875
6708bb27 2876 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2877 spin_unlock(&dev->dev_reservation_lock);
2878 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2879 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2880 }
2881 /*
2882 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2883 *
2884 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2885 * persistent reservation holder or there is no persistent reservation
2886 * holder (i.e., there is no persistent reservation), then the device
2887 * server shall perform a preempt by doing the following in an
2888 * uninterrupted series of actions. (See below..)
2889 */
6708bb27 2890 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2891 /*
2892 * No existing or SA Reservation Key matching reservations..
2893 *
2894 * PROUT SA PREEMPT with All Registrant type reservations are
2895 * allowed to be processed without a matching SA Reservation Key
2896 */
2897 spin_lock(&pr_tmpl->registration_lock);
2898 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2899 &pr_tmpl->registration_list, pr_reg_list) {
2900 /*
2901 * Removing of registrations in non all registrants
2902 * type reservations without a matching SA reservation
2903 * key.
2904 *
2905 * a) Remove the registrations for all I_T nexuses
2906 * specified by the SERVICE ACTION RESERVATION KEY
2907 * field;
2908 * b) Ignore the contents of the SCOPE and TYPE fields;
2909 * c) Process tasks as defined in 5.7.1; and
2910 * d) Establish a unit attention condition for the
2911 * initiator port associated with every I_T nexus
2912 * that lost its registration other than the I_T
2913 * nexus on which the PERSISTENT RESERVE OUT command
2914 * was received, with the additional sense code set
2915 * to REGISTRATIONS PREEMPTED.
2916 */
6708bb27 2917 if (!all_reg) {
c66ac9db
NB		 2918 if (pr_reg->pr_res_key != sa_res_key)
2919 continue;
2920
2921 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2922 pr_reg_nacl = pr_reg->pr_reg_nacl;
2923 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2924 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2925 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db
NB		 2926 NULL, calling_it_nexus);
2927 released_regs++;
2928 } else {
2929 /*
2930 * Case for any existing all registrants type
2931 * reservation, follow logic in spc4r17 section
2932 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2933 *
2934 * For a ZERO SA Reservation key, release
2935 * all other registrations and do an implict
2936 * release of active persistent reservation.
2937 *
2938 * For a non-ZERO SA Reservation key, only
2939 * release the matching reservation key from
2940 * registrations.
2941 */
2942 if ((sa_res_key) &&
2943 (pr_reg->pr_res_key != sa_res_key))
2944 continue;
2945
2946 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2947 if (calling_it_nexus)
2948 continue;
2949
2950 pr_reg_nacl = pr_reg->pr_reg_nacl;
2951 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2952 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2953 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db
NB		 2954 NULL, 0);
2955 released_regs++;
2956 }
6708bb27 2957 if (!calling_it_nexus)
c66ac9db
NB		 2958 core_scsi3_ua_allocate(pr_reg_nacl,
2959 pr_res_mapped_lun, 0x2A,
9e08e34e 2960 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2961 }
2962 spin_unlock(&pr_tmpl->registration_lock);
2963 /*
2964 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2965 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2966 * RESERVATION KEY field to a value that does not match any
2967 * registered reservation key, then the device server shall
2968 * complete the command with RESERVATION CONFLICT status.
2969 */
6708bb27 2970 if (!released_regs) {
c66ac9db
NB		 2971 spin_unlock(&dev->dev_reservation_lock);
2972 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2973 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2974 }
2975 /*
2976 * For an existing all registrants type reservation
2977 * with a zero SA rservation key, preempt the existing
2978 * reservation with the new PR type and scope.
2979 */
2980 if (pr_res_holder && all_reg && !(sa_res_key)) {
2981 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2982 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2983 type, scope, preempt_type);
c66ac9db 2984
33ce6a87 2985 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2986 core_scsi3_release_preempt_and_abort(
2987 &preempt_and_abort_list, pr_reg_n);
2988 }
2989 spin_unlock(&dev->dev_reservation_lock);
2990
2991 if (pr_tmpl->pr_aptpl_active) {
de103c93 2992 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 2993 pr_reg_n->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
6708bb27 2994 pr_debug("SPC-3 PR: Updated APTPL"
33ce6a87 2995 " metadata for PREEMPT%s\n", (preempt_type == PREEMPT_AND_ABORT) ?
c66ac9db 2996 "_AND_ABORT" : "");
de103c93 2997 }
c66ac9db
NB		 2998 }
2999
3000 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3001 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3002 return 0;
3003 }
3004 /*
3005 * The PREEMPTing SA reservation key matches that of the
3006 * existing persistent reservation, first, we check if
3007 * we are preempting our own reservation.
3008 * From spc4r17, section 5.7.11.4.3 Preempting
3009 * persistent reservations and registration handling
3010 *
3011 * If an all registrants persistent reservation is not
3012 * present, it is not an error for the persistent
3013 * reservation holder to preempt itself (i.e., a
3014 * PERSISTENT RESERVE OUT with a PREEMPT service action
3015 * or a PREEMPT AND ABORT service action with the
3016 * SERVICE ACTION RESERVATION KEY value equal to the
3017 * persistent reservation holder's reservation key that
3018 * is received from the persistent reservation holder).
3019 * In that case, the device server shall establish the
3020 * new persistent reservation and maintain the
3021 * registration.
3022 */
3023 prh_type = pr_res_holder->pr_res_type;
3024 prh_scope = pr_res_holder->pr_res_scope;
3025 /*
3026 * If the SERVICE ACTION RESERVATION KEY field identifies a
3027 * persistent reservation holder (see 5.7.10), the device
3028 * server shall perform a preempt by doing the following as
3029 * an uninterrupted series of actions:
3030 *
3031 * a) Release the persistent reservation for the holder
3032 * identified by the SERVICE ACTION RESERVATION KEY field;
3033 */
3034 if (pr_reg_n != pr_res_holder)
3035 __core_scsi3_complete_pro_release(dev,
3036 pr_res_holder->pr_reg_nacl,
3037 dev->dev_pr_res_holder, 0);
3038 /*
3039 * b) Remove the registrations for all I_T nexuses identified
3040 * by the SERVICE ACTION RESERVATION KEY field, except the
3041 * I_T nexus that is being used for the PERSISTENT RESERVE
3042 * OUT command. If an all registrants persistent reservation
3043 * is present and the SERVICE ACTION RESERVATION KEY field
3044 * is set to zero, then all registrations shall be removed
3045 * except for that of the I_T nexus that is being used for
3046 * the PERSISTENT RESERVE OUT command;
3047 */
3048 spin_lock(&pr_tmpl->registration_lock);
3049 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3050 &pr_tmpl->registration_list, pr_reg_list) {
3051
3052 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3053 if (calling_it_nexus)
3054 continue;
3055
3056 if (pr_reg->pr_res_key != sa_res_key)
3057 continue;
3058
3059 pr_reg_nacl = pr_reg->pr_reg_nacl;
3060 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3061 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3062 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3063 calling_it_nexus);
3064 /*
3065 * e) Establish a unit attention condition for the initiator
3066 * port associated with every I_T nexus that lost its
3067 * persistent reservation and/or registration, with the
3068 * additional sense code set to REGISTRATIONS PREEMPTED;
3069 */
3070 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3071 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3072 }
3073 spin_unlock(&pr_tmpl->registration_lock);
3074 /*
3075 * c) Establish a persistent reservation for the preempting
3076 * I_T nexus using the contents of the SCOPE and TYPE fields;
3077 */
3078 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3079 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3080 type, scope, preempt_type);
c66ac9db
NB		 3081 /*
3082 * d) Process tasks as defined in 5.7.1;
3083 * e) See above..
3084 * f) If the type or scope has changed, then for every I_T nexus
3085 * whose reservation key was not removed, except for the I_T
3086 * nexus on which the PERSISTENT RESERVE OUT command was
3087 * received, the device server shall establish a unit
3088 * attention condition for the initiator port associated with
3089 * that I_T nexus, with the additional sense code set to
3090 * RESERVATIONS RELEASED. If the type or scope have not
3091 * changed, then no unit attention condition(s) shall be
3092 * established for this reason.
3093 */
3094 if ((prh_type != type) || (prh_scope != scope)) {
3095 spin_lock(&pr_tmpl->registration_lock);
3096 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3097 &pr_tmpl->registration_list, pr_reg_list) {
3098
3099 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3100 if (calling_it_nexus)
3101 continue;
3102
3103 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3104 pr_reg->pr_res_mapped_lun, 0x2A,
3105 ASCQ_2AH_RESERVATIONS_RELEASED);
3106 }
3107 spin_unlock(&pr_tmpl->registration_lock);
3108 }
3109 spin_unlock(&dev->dev_reservation_lock);
3110 /*
3111 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3112 * All received CDBs for the matching existing reservation and
3113 * registrations undergo ABORT_TASK logic.
3114 *
3115 * From there, core_scsi3_release_preempt_and_abort() will
3116 * release every registration in the list (which have already
3117 * been removed from the primary pr_reg list), except the
3118 * new persistent reservation holder, the calling Initiator Port.
3119 */
33ce6a87 3120 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3121 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3122 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3123 pr_reg_n);
3124 }
3125
3126 if (pr_tmpl->pr_aptpl_active) {
de103c93 3127 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 3128 pr_reg_n->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
6708bb27 3129 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
33ce6a87 3130 "%s\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 3131 }
c66ac9db
NB		 3132 }
3133
3134 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3135 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3136 return 0;
3137}
3138
de103c93
CH		 3139static sense_reason_t
3140core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3141 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3142{
c66ac9db
NB		 3143 switch (type) {
3144 case PR_TYPE_WRITE_EXCLUSIVE:
3145 case PR_TYPE_EXCLUSIVE_ACCESS:
3146 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3147 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3148 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3149 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3150 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3151 sa_res_key, preempt_type);
c66ac9db 3152 default:
6708bb27 3153 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3154 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3155 return TCM_INVALID_CDB_FIELD;
c66ac9db 3156 }
c66ac9db
NB		 3157}
3158
3159
de103c93
CH		 3160static sense_reason_t
3161core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3162 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3163{
e3d6f909 3164 struct se_session *se_sess = cmd->se_sess;
5951146d 3165 struct se_device *dev = cmd->se_dev;
28168905 3166 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3167 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3168 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3169 struct se_port *se_port;
3170 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3171 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3172 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3173 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3174 unsigned char *buf;
c66ac9db
NB		 3175 unsigned char *initiator_str;
3176 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3177 u32 tid_len, tmp_tid_len;
d2843c17 3178 int new_reg = 0, type, scope, matching_iname;
de103c93 3179 sense_reason_t ret;
c66ac9db
NB		 3180 unsigned short rtpi;
3181 unsigned char proto_ident;
3182
6708bb27
AG		 3183 if (!se_sess || !se_lun) {
3184 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3185 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3186 }
de103c93 3187
c66ac9db
NB		 3188 memset(dest_iport, 0, 64);
3189 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3190 se_tpg = se_sess->se_tpg;
e3d6f909 3191 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3192 /*
3193 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3194 * Register behaviors for a REGISTER AND MOVE service action
3195 *
3196 * Locate the existing *pr_reg via struct se_node_acl pointers
3197 */
5951146d 3198 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3199 se_sess);
6708bb27
AG		 3200 if (!pr_reg) {
3201 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3202 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3203 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3204 }
3205 /*
3206 * The provided reservation key much match the existing reservation key
3207 * provided during this initiator's I_T nexus registration.
3208 */
3209 if (res_key != pr_reg->pr_res_key) {
6708bb27 3210 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3211 " res_key: 0x%016Lx does not match existing SA REGISTER"
3212 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3213 ret = TCM_RESERVATION_CONFLICT;
3214 goto out_put_pr_reg;
c66ac9db
NB		 3215 }
3216 /*
3217 * The service active reservation key needs to be non zero
3218 */
6708bb27
AG		 3219 if (!sa_res_key) {
3220 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3221 " sa_res_key\n");
de103c93
CH		 3222 ret = TCM_INVALID_PARAMETER_LIST;
3223 goto out_put_pr_reg;
c66ac9db 3224 }
05d1c7c0 3225
c66ac9db
NB		 3226 /*
3227 * Determine the Relative Target Port Identifier where the reservation
3228 * will be moved to for the TransportID containing SCSI initiator WWN
3229 * information.
3230 */
4949314c 3231 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3232 if (!buf) {
3233 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3234 goto out_put_pr_reg;
3235 }
3236
c66ac9db
NB		 3237 rtpi = (buf[18] & 0xff) << 8;
3238 rtpi |= buf[19] & 0xff;
3239 tid_len = (buf[20] & 0xff) << 24;
3240 tid_len |= (buf[21] & 0xff) << 16;
3241 tid_len |= (buf[22] & 0xff) << 8;
3242 tid_len |= buf[23] & 0xff;
4949314c 3243 transport_kunmap_data_sg(cmd);
05d1c7c0 3244 buf = NULL;
c66ac9db
NB		 3245
3246 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3247 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3248 " does not equal CDB data_length: %u\n", tid_len,
3249 cmd->data_length);
de103c93
CH		 3250 ret = TCM_INVALID_PARAMETER_LIST;
3251 goto out_put_pr_reg;
c66ac9db
NB		 3252 }
3253
3254 spin_lock(&dev->se_port_lock);
3255 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3256 if (se_port->sep_rtpi != rtpi)
3257 continue;
3258 dest_se_tpg = se_port->sep_tpg;
6708bb27 3259 if (!dest_se_tpg)
c66ac9db 3260 continue;
e3d6f909 3261 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3262 if (!dest_tf_ops)
c66ac9db
NB		 3263 continue;
3264
3265 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3266 smp_mb__after_atomic_inc();
3267 spin_unlock(&dev->se_port_lock);
3268
de103c93 3269 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3270 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db
NB		 3271 " for dest_se_tpg\n");
3272 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3273 smp_mb__after_atomic_dec();
de103c93
CH		 3274 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3275 goto out_put_pr_reg;
c66ac9db
NB		 3276 }
3277
3278 spin_lock(&dev->se_port_lock);
3279 break;
3280 }
3281 spin_unlock(&dev->se_port_lock);
3282
6708bb27
AG		 3283 if (!dest_se_tpg || !dest_tf_ops) {
3284 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3285 " fabric ops from Relative Target Port Identifier:"
3286 " %hu\n", rtpi);
de103c93
CH		 3287 ret = TCM_INVALID_PARAMETER_LIST;
3288 goto out_put_pr_reg;
c66ac9db 3289 }
05d1c7c0 3290
4949314c 3291 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3292 if (!buf) {
3293 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3294 goto out_put_pr_reg;
3295 }
c66ac9db 3296 proto_ident = (buf[24] & 0x0f);
8b1e1244 3297
6708bb27 3298 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3299 " 0x%02x\n", proto_ident);
8b1e1244 3300
c66ac9db 3301 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3302 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3303 " proto_ident: 0x%02x does not match ident: 0x%02x"
3304 " from fabric: %s\n", proto_ident,
3305 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3306 dest_tf_ops->get_fabric_name());
de103c93 3307 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3308 goto out;
3309 }
3310 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3311 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3312 " containg a valid tpg_parse_pr_out_transport_id"
3313 " function pointer\n");
de103c93 3314 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3315 goto out;
3316 }
3317 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3318 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3319 if (!initiator_str) {
3320 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3321 " initiator_str from Transport ID\n");
de103c93 3322 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3323 goto out;
3324 }
3325
4949314c 3326 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3327 buf = NULL;
3328
6708bb27 3329 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3330 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3331 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3332 iport_ptr : "");
3333 /*
3334 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3335 * action specifies a TransportID that is the same as the initiator port
3336 * of the I_T nexus for the command received, then the command shall
3337 * be terminated with CHECK CONDITION status, with the sense key set to
3338 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3339 * IN PARAMETER LIST.
3340 */
3341 pr_reg_nacl = pr_reg->pr_reg_nacl;
3342 matching_iname = (!strcmp(initiator_str,
3343 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3344 if (!matching_iname)
c66ac9db
NB		 3345 goto after_iport_check;
3346
6708bb27
AG		 3347 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3348 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3349 " matches: %s on received I_T Nexus\n", initiator_str,
3350 pr_reg_nacl->initiatorname);
de103c93 3351 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3352 goto out;
3353 }
6708bb27
AG		 3354 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3355 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3356 " matches: %s %s on received I_T Nexus\n",
3357 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3358 pr_reg->pr_reg_isid);
de103c93 3359 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3360 goto out;
3361 }
3362after_iport_check:
3363 /*
3364 * Locate the destination struct se_node_acl from the received Transport ID
3365 */
28638887 3366 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3367 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3368 initiator_str);
3369 if (dest_node_acl) {
3370 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3371 smp_mb__after_atomic_inc();
3372 }
28638887 3373 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3374
6708bb27
AG		 3375 if (!dest_node_acl) {
3376 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3377 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3378 initiator_str);
de103c93 3379 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3380 goto out;
3381 }
de103c93
CH		 3382
3383 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3384 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db
NB		 3385 " dest_node_acl\n");
3386 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3387 smp_mb__after_atomic_dec();
3388 dest_node_acl = NULL;
de103c93 3389 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3390 goto out;
3391 }
8b1e1244 3392
6708bb27 3393 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3394 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3395 dest_node_acl->initiatorname);
8b1e1244 3396
c66ac9db
NB		 3397 /*
3398 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3399 * PORT IDENTIFIER.
3400 */
3401 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3402 if (!dest_se_deve) {
3403 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3404 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3405 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3406 goto out;
3407 }
3408
de103c93 3409 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3410 pr_err("core_scsi3_lunacl_depend_item() failed\n");
c66ac9db
NB		 3411 atomic_dec(&dest_se_deve->pr_ref_count);
3412 smp_mb__after_atomic_dec();
3413 dest_se_deve = NULL;
de103c93 3414 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3415 goto out;
3416 }
8b1e1244 3417
6708bb27 3418 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3419 " ACL for dest_se_deve->mapped_lun: %u\n",
3420 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3421 dest_se_deve->mapped_lun);
8b1e1244 3422
c66ac9db
NB		 3423 /*
3424 * A persistent reservation needs to already existing in order to
3425 * successfully complete the REGISTER_AND_MOVE service action..
3426 */
3427 spin_lock(&dev->dev_reservation_lock);
3428 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3429 if (!pr_res_holder) {
3430 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3431 " currently held\n");
3432 spin_unlock(&dev->dev_reservation_lock);
de103c93 3433 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3434 goto out;
3435 }
3436 /*
3437 * The received on I_T Nexus must be the reservation holder.
3438 *
3439 * From spc4r17 section 5.7.8 Table 50 --
3440 * Register behaviors for a REGISTER AND MOVE service action
3441 */
3442 if (pr_res_holder != pr_reg) {
6708bb27 3443 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3444 " Nexus is not reservation holder\n");
3445 spin_unlock(&dev->dev_reservation_lock);
de103c93 3446 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3447 goto out;
3448 }
3449 /*
3450 * From spc4r17 section 5.7.8: registering and moving reservation
3451 *
3452 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3453 * action is received and the established persistent reservation is a
3454 * Write Exclusive - All Registrants type or Exclusive Access -
3455 * All Registrants type reservation, then the command shall be completed
3456 * with RESERVATION CONFLICT status.
3457 */
3458 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3459 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3460 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3461 " reservation for type: %s\n",
3462 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3463 spin_unlock(&dev->dev_reservation_lock);
de103c93 3464 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3465 goto out;
3466 }
3467 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3468 /*
3469 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3470 */
3471 type = pr_res_holder->pr_res_type;
3472 scope = pr_res_holder->pr_res_type;
3473 /*
3474 * c) Associate the reservation key specified in the SERVICE ACTION
3475 * RESERVATION KEY field with the I_T nexus specified as the
3476 * destination of the register and move, where:
3477 * A) The I_T nexus is specified by the TransportID and the
3478 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3479 * B) Regardless of the TransportID format used, the association for
3480 * the initiator port is based on either the initiator port name
3481 * (see 3.1.71) on SCSI transport protocols where port names are
3482 * required or the initiator port identifier (see 3.1.70) on SCSI
3483 * transport protocols where port names are not required;
3484 * d) Register the reservation key specified in the SERVICE ACTION
3485 * RESERVATION KEY field;
3486 * e) Retain the reservation key specified in the SERVICE ACTION
3487 * RESERVATION KEY field and associated information;
3488 *
3489 * Also, It is not an error for a REGISTER AND MOVE service action to
3490 * register an I_T nexus that is already registered with the same
3491 * reservation key or a different reservation key.
3492 */
3493 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3494 iport_ptr);
6708bb27 3495 if (!dest_pr_reg) {
de103c93 3496 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3497 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3498 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3499 spin_unlock(&dev->dev_reservation_lock);
de103c93 3500 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3501 goto out;
3502 }
3503 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3504 iport_ptr);
3505 new_reg = 1;
3506 }
3507 /*
3508 * f) Release the persistent reservation for the persistent reservation
3509 * holder (i.e., the I_T nexus on which the
3510 */
3511 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3512 dev->dev_pr_res_holder, 0);
3513 /*
3514 * g) Move the persistent reservation to the specified I_T nexus using
3515 * the same scope and type as the persistent reservation released in
3516 * item f); and
3517 */
3518 dev->dev_pr_res_holder = dest_pr_reg;
3519 dest_pr_reg->pr_res_holder = 1;
3520 dest_pr_reg->pr_res_type = type;
3521 pr_reg->pr_res_scope = scope;
d2843c17 3522 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3523 /*
3524 * Increment PRGeneration for existing registrations..
3525 */
6708bb27 3526 if (!new_reg)
c66ac9db
NB		 3527 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3528 spin_unlock(&dev->dev_reservation_lock);
3529
6708bb27 3530 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3531 " created new reservation holder TYPE: %s on object RTPI:"
3532 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3533 core_scsi3_pr_dump_type(type), rtpi,
3534 dest_pr_reg->pr_res_generation);
6708bb27 3535 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3536 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3537 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3538 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3539 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3540 iport_ptr : "");
3541 /*
3542 * It is now safe to release configfs group dependencies for destination
3543 * of Transport ID Initiator Device/Port Identifier
3544 */
3545 core_scsi3_lunacl_undepend_item(dest_se_deve);
3546 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3547 core_scsi3_tpg_undepend_item(dest_se_tpg);
3548 /*
3549 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3550 * nexus on which PERSISTENT RESERVE OUT command was received.
3551 */
3552 if (unreg) {
3553 spin_lock(&pr_tmpl->registration_lock);
3554 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3555 spin_unlock(&pr_tmpl->registration_lock);
3556 } else
3557 core_scsi3_put_pr_reg(pr_reg);
3558
3559 /*
3560 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3561 * write out the updated metadata to struct file for this SCSI device.
3562 */
6708bb27 3563 if (!aptpl) {
c66ac9db 3564 pr_tmpl->pr_aptpl_active = 0;
5951146d 3565 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 3566 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
c66ac9db
NB		 3567 " REGISTER_AND_MOVE\n");
3568 } else {
3569 pr_tmpl->pr_aptpl_active = 1;
de103c93 3570 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
4e529be2 3571 dest_pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
6708bb27 3572 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
c66ac9db 3573 " REGISTER_AND_MOVE\n");
de103c93 3574 }
c66ac9db
NB		 3575 }
3576
4949314c 3577 transport_kunmap_data_sg(cmd);
05d1c7c0 3578
c66ac9db
NB		 3579 core_scsi3_put_pr_reg(dest_pr_reg);
3580 return 0;
3581out:
05d1c7c0 3582 if (buf)
4949314c 3583 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3584 if (dest_se_deve)
3585 core_scsi3_lunacl_undepend_item(dest_se_deve);
3586 if (dest_node_acl)
3587 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3588 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3589
3590out_put_pr_reg:
c66ac9db
NB		 3591 core_scsi3_put_pr_reg(pr_reg);
3592 return ret;
3593}
3594
3595static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3596{
3597 unsigned int __v1, __v2;
3598
3599 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3600 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3601
3602 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3603}
3604
3605/*
3606 * See spc4r17 section 6.14 Table 170
3607 */
de103c93
CH		 3608sense_reason_t
3609target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3610{
617c0e06 3611 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3612 unsigned char *buf;
c66ac9db
NB		 3613 u64 res_key, sa_res_key;
3614 int sa, scope, type, aptpl;
3615 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3616 sense_reason_t ret;
617c0e06
CH		 3617
3618 /*
3619 * Following spc2r20 5.5.1 Reservations overview:
3620 *
3621 * If a logical unit has been reserved by any RESERVE command and is
3622 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3623 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3624 * initiator or service action and shall terminate with a RESERVATION
3625 * CONFLICT status.
3626 */
0fd97ccf 3627 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3628 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3629 " SPC-2 reservation is held, returning"
3630 " RESERVATION_CONFLICT\n");
de103c93 3631 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3632 }
3633
c66ac9db
NB		 3634 /*
3635 * FIXME: A NULL struct se_session pointer means an this is not coming from
3636 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3637 */
de103c93
CH		 3638 if (!cmd->se_sess)
3639 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3640
3641 if (cmd->data_length < 24) {
6708bb27 3642 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3643 " length too small: %u\n", cmd->data_length);
de103c93 3644 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3645 }
de103c93 3646
c66ac9db
NB		 3647 /*
3648 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3649 */
3650 sa = (cdb[1] & 0x1f);
3651 scope = (cdb[2] & 0xf0);
3652 type = (cdb[2] & 0x0f);
05d1c7c0 3653
4949314c 3654 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3655 if (!buf)
3656 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3657
c66ac9db
NB		 3658 /*
3659 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3660 */
3661 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3662 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3663 /*
3664 * REGISTER_AND_MOVE uses a different SA parameter list containing
3665 * SCSI TransportIDs.
3666 */
3667 if (sa != PRO_REGISTER_AND_MOVE) {
3668 spec_i_pt = (buf[20] & 0x08);
3669 all_tg_pt = (buf[20] & 0x04);
3670 aptpl = (buf[20] & 0x01);
3671 } else {
3672 aptpl = (buf[17] & 0x01);
3673 unreg = (buf[17] & 0x02);
3674 }
4949314c 3675 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3676 buf = NULL;
3677
c66ac9db
NB		 3678 /*
3679 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3680 */
de103c93
CH		 3681 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3682 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3683
c66ac9db
NB		 3684 /*
3685 * From spc4r17 section 6.14:
3686 *
3687 * If the SPEC_I_PT bit is set to zero, the service action is not
3688 * REGISTER AND MOVE, and the parameter list length is not 24, then
3689 * the command shall be terminated with CHECK CONDITION status, with
3690 * the sense key set to ILLEGAL REQUEST, and the additional sense
3691 * code set to PARAMETER LIST LENGTH ERROR.
3692 */
6708bb27 3693 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3694 (cmd->data_length != 24)) {
6708bb27 3695 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3696 " list length: %u\n", cmd->data_length);
de103c93 3697 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3698 }
de103c93 3699
c66ac9db
NB		 3700 /*
3701 * (core_scsi3_emulate_pro_* function parameters
3702 * are defined by spc4r17 Table 174:
3703 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3704 */
3705 switch (sa) {
3706 case PRO_REGISTER:
d29a5b6a 3707 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3708 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3709 break;
c66ac9db 3710 case PRO_RESERVE:
d29a5b6a
CH		 3711 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3712 break;
c66ac9db 3713 case PRO_RELEASE:
d29a5b6a
CH		 3714 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3715 break;
c66ac9db 3716 case PRO_CLEAR:
d29a5b6a
CH		 3717 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3718 break;
c66ac9db 3719 case PRO_PREEMPT:
d29a5b6a 3720 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3721 res_key, sa_res_key, PREEMPT);
d29a5b6a 3722 break;
c66ac9db 3723 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3724 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3725 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3726 break;
c66ac9db 3727 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3728 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3729 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3730 break;
c66ac9db 3731 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3732 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3733 sa_res_key, aptpl, unreg);
d29a5b6a 3734 break;
c66ac9db 3735 default:
6708bb27 3736 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3737 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3738 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3739 }
3740
6bb35e00
CH		 3741 if (!ret)
3742 target_complete_cmd(cmd, GOOD);
d29a5b6a 3743 return ret;
c66ac9db
NB		 3744}
3745
3746/*
3747 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3748 *
3749 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3750 */
de103c93
CH		 3751static sense_reason_t
3752core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3753{
0fd97ccf 3754 struct se_device *dev = cmd->se_dev;
c66ac9db 3755 struct t10_pr_registration *pr_reg;
05d1c7c0 3756 unsigned char *buf;
c66ac9db
NB		 3757 u32 add_len = 0, off = 8;
3758
3759 if (cmd->data_length < 8) {
6708bb27 3760 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3761 " too small\n", cmd->data_length);
de103c93 3762 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3763 }
3764
4949314c 3765 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3766 if (!buf)
3767 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3768
0fd97ccf
CH		 3769 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3770 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3771 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3772 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3773
0fd97ccf
CH		 3774 spin_lock(&dev->t10_pr.registration_lock);
3775 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3776 pr_reg_list) {
3777 /*
3778 * Check for overflow of 8byte PRI READ_KEYS payload and
3779 * next reservation key list descriptor.
3780 */
3781 if ((add_len + 8) > (cmd->data_length - 8))
3782 break;
3783
3784 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3785 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3786 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3787 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3788 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3789 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3790 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3791 buf[off++] = (pr_reg->pr_res_key & 0xff);
3792
3793 add_len += 8;
3794 }
0fd97ccf 3795 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3796
3797 buf[4] = ((add_len >> 24) & 0xff);
3798 buf[5] = ((add_len >> 16) & 0xff);
3799 buf[6] = ((add_len >> 8) & 0xff);
3800 buf[7] = (add_len & 0xff);
3801
4949314c 3802 transport_kunmap_data_sg(cmd);
05d1c7c0 3803
c66ac9db
NB		 3804 return 0;
3805}
3806
3807/*
3808 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3809 *
3810 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3811 */
de103c93
CH		 3812static sense_reason_t
3813core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3814{
0fd97ccf 3815 struct se_device *dev = cmd->se_dev;
c66ac9db 3816 struct t10_pr_registration *pr_reg;
05d1c7c0 3817 unsigned char *buf;
c66ac9db
NB		 3818 u64 pr_res_key;
3819 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3820
3821 if (cmd->data_length < 8) {
6708bb27 3822 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3823 " too small\n", cmd->data_length);
de103c93 3824 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3825 }
3826
4949314c 3827 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3828 if (!buf)
3829 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3830
0fd97ccf
CH		 3831 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3832 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3833 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3834 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3835
0fd97ccf
CH		 3836 spin_lock(&dev->dev_reservation_lock);
3837 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3838 if (pr_reg) {
c66ac9db
NB		 3839 /*
3840 * Set the hardcoded Additional Length
3841 */
3842 buf[4] = ((add_len >> 24) & 0xff);
3843 buf[5] = ((add_len >> 16) & 0xff);
3844 buf[6] = ((add_len >> 8) & 0xff);
3845 buf[7] = (add_len & 0xff);
3846
05d1c7c0
AG		 3847 if (cmd->data_length < 22)
3848 goto err;
3849
c66ac9db
NB		 3850 /*
3851 * Set the Reservation key.
3852 *
3853 * From spc4r17, section 5.7.10:
3854 * A persistent reservation holder has its reservation key
3855 * returned in the parameter data from a PERSISTENT
3856 * RESERVE IN command with READ RESERVATION service action as
3857 * follows:
3858 * a) For a persistent reservation of the type Write Exclusive
3859 * - All Registrants or Exclusive Access ­ All Regitrants,
3860 * the reservation key shall be set to zero; or
3861 * b) For all other persistent reservation types, the
3862 * reservation key shall be set to the registered
3863 * reservation key for the I_T nexus that holds the
3864 * persistent reservation.
3865 */
3866 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3867 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3868 pr_res_key = 0;
3869 else
3870 pr_res_key = pr_reg->pr_res_key;
3871
3872 buf[8] = ((pr_res_key >> 56) & 0xff);
3873 buf[9] = ((pr_res_key >> 48) & 0xff);
3874 buf[10] = ((pr_res_key >> 40) & 0xff);
3875 buf[11] = ((pr_res_key >> 32) & 0xff);
3876 buf[12] = ((pr_res_key >> 24) & 0xff);
3877 buf[13] = ((pr_res_key >> 16) & 0xff);
3878 buf[14] = ((pr_res_key >> 8) & 0xff);
3879 buf[15] = (pr_res_key & 0xff);
3880 /*
3881 * Set the SCOPE and TYPE
3882 */
3883 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3884 (pr_reg->pr_res_type & 0x0f);
3885 }
05d1c7c0
AG		 3886
3887err:
0fd97ccf 3888 spin_unlock(&dev->dev_reservation_lock);
4949314c 3889 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3890
3891 return 0;
3892}
3893
3894/*
3895 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3896 *
3897 * See spc4r17 section 6.13.4 Table 165
3898 */
de103c93
CH		 3899static sense_reason_t
3900core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3901{
5951146d 3902 struct se_device *dev = cmd->se_dev;
0fd97ccf 3903 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3904 unsigned char *buf;
c66ac9db
NB		 3905 u16 add_len = 8; /* Hardcoded to 8. */
3906
3907 if (cmd->data_length < 6) {
6708bb27 3908 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3909 " %u too small\n", cmd->data_length);
de103c93 3910 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3911 }
3912
4949314c 3913 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3914 if (!buf)
3915 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3916
c66ac9db
NB		 3917 buf[0] = ((add_len << 8) & 0xff);
3918 buf[1] = (add_len & 0xff);
3919 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3920 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3921 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3922 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3923 /*
3924 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3925 * set the TMV: Task Mask Valid bit.
3926 */
3927 buf[3] |= 0x80;
3928 /*
3929 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3930 */
3931 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3932 /*
3933 * PTPL_A: Persistence across Target Power Loss Active bit
3934 */
3935 if (pr_tmpl->pr_aptpl_active)
3936 buf[3] |= 0x01;
3937 /*
3938 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3939 */
3940 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3941 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3942 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3943 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3944 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3945 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3946
4949314c 3947 transport_kunmap_data_sg(cmd);
05d1c7c0 3948
c66ac9db
NB		 3949 return 0;
3950}
3951
3952/*
3953 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3954 *
3955 * See spc4r17 section 6.13.5 Table 168 and 169
3956 */
de103c93
CH		 3957static sense_reason_t
3958core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3959{
0fd97ccf 3960 struct se_device *dev = cmd->se_dev;
c66ac9db 3961 struct se_node_acl *se_nacl;
c66ac9db
NB		 3962 struct se_portal_group *se_tpg;
3963 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3964 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3965 unsigned char *buf;
c66ac9db
NB		 3966 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3967 u32 off = 8; /* off into first Full Status descriptor */
3968 int format_code = 0;
3969
3970 if (cmd->data_length < 8) {
6708bb27 3971 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3972 " too small\n", cmd->data_length);
de103c93 3973 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3974 }
3975
4949314c 3976 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3977 if (!buf)
3978 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3979
0fd97ccf
CH		 3980 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3981 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3982 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3983 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db
NB		 3984
3985 spin_lock(&pr_tmpl->registration_lock);
3986 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3987 &pr_tmpl->registration_list, pr_reg_list) {
3988
3989 se_nacl = pr_reg->pr_reg_nacl;
3990 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3991 add_desc_len = 0;
3992
3993 atomic_inc(&pr_reg->pr_res_holders);
3994 smp_mb__after_atomic_inc();
3995 spin_unlock(&pr_tmpl->registration_lock);
3996 /*
3997 * Determine expected length of $FABRIC_MOD specific
3998 * TransportID full status descriptor..
3999 */
e3d6f909 4000 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 4001 se_tpg, se_nacl, pr_reg, &format_code);
4002
4003 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 4004 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 4005 " out of buffer: %d\n", cmd->data_length);
4006 spin_lock(&pr_tmpl->registration_lock);
4007 atomic_dec(&pr_reg->pr_res_holders);
4008 smp_mb__after_atomic_dec();
4009 break;
4010 }
4011 /*
4012 * Set RESERVATION KEY
4013 */
4014 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4015 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4016 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4017 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4018 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4019 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4020 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4021 buf[off++] = (pr_reg->pr_res_key & 0xff);
4022 off += 4; /* Skip Over Reserved area */
4023
4024 /*
4025 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4026 */
4027 if (pr_reg->pr_reg_all_tg_pt)
4028 buf[off] = 0x02;
4029 /*
4030 * The struct se_lun pointer will be present for the
4031 * reservation holder for PR_HOLDER bit.
4032 *
4033 * Also, if this registration is the reservation
4034 * holder, fill in SCOPE and TYPE in the next byte.
4035 */
4036 if (pr_reg->pr_res_holder) {
4037 buf[off++] |= 0x01;
4038 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4039 (pr_reg->pr_res_type & 0x0f);
4040 } else
4041 off += 2;
4042
4043 off += 4; /* Skip over reserved area */
4044 /*
4045 * From spc4r17 6.3.15:
4046 *
4047 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4048 * IDENTIFIER field contains the relative port identifier (see
4049 * 3.1.120) of the target port that is part of the I_T nexus
4050 * described by this full status descriptor. If the ALL_TG_PT
4051 * bit is set to one, the contents of the RELATIVE TARGET PORT
4052 * IDENTIFIER field are not defined by this standard.
4053 */
6708bb27 4054 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 4055 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4056
4057 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4058 buf[off++] = (port->sep_rtpi & 0xff);
4059 } else
35d1efe8 4060 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 4061
4062 /*
4063 * Now, have the $FABRIC_MOD fill in the protocol identifier
4064 */
e3d6f909 4065 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 4066 se_nacl, pr_reg, &format_code, &buf[off+4]);
4067
4068 spin_lock(&pr_tmpl->registration_lock);
4069 atomic_dec(&pr_reg->pr_res_holders);
4070 smp_mb__after_atomic_dec();
4071 /*
4072 * Set the ADDITIONAL DESCRIPTOR LENGTH
4073 */
4074 buf[off++] = ((desc_len >> 24) & 0xff);
4075 buf[off++] = ((desc_len >> 16) & 0xff);
4076 buf[off++] = ((desc_len >> 8) & 0xff);
4077 buf[off++] = (desc_len & 0xff);
4078 /*
4079 * Size of full desctipor header minus TransportID
4080 * containing $FABRIC_MOD specific) initiator device/port
4081 * WWN information.
4082 *
4083 * See spc4r17 Section 6.13.5 Table 169
4084 */
4085 add_desc_len = (24 + desc_len);
4086
4087 off += desc_len;
4088 add_len += add_desc_len;
4089 }
4090 spin_unlock(&pr_tmpl->registration_lock);
4091 /*
4092 * Set ADDITIONAL_LENGTH
4093 */
4094 buf[4] = ((add_len >> 24) & 0xff);
4095 buf[5] = ((add_len >> 16) & 0xff);
4096 buf[6] = ((add_len >> 8) & 0xff);
4097 buf[7] = (add_len & 0xff);
4098
4949314c 4099 transport_kunmap_data_sg(cmd);
05d1c7c0 4100
c66ac9db
NB		 4101 return 0;
4102}
4103
de103c93
CH		 4104sense_reason_t
4105target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4106{
de103c93 4107 sense_reason_t ret;
e76a35d6 4108
c66ac9db
NB		 4109 /*
4110 * Following spc2r20 5.5.1 Reservations overview:
4111 *
4112 * If a logical unit has been reserved by any RESERVE command and is
4113 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4114 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4115 * initiator or service action and shall terminate with a RESERVATION
4116 * CONFLICT status.
4117 */
0fd97ccf 4118 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4119 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4120 " SPC-2 reservation is held, returning"
4121 " RESERVATION_CONFLICT\n");
de103c93 4122 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4123 }
4124
617c0e06
CH		 4125 switch (cmd->t_task_cdb[1] & 0x1f) {
4126 case PRI_READ_KEYS:
d29a5b6a
CH		 4127 ret = core_scsi3_pri_read_keys(cmd);
4128 break;
617c0e06 4129 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4130 ret = core_scsi3_pri_read_reservation(cmd);
4131 break;
617c0e06 4132 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4133 ret = core_scsi3_pri_report_capabilities(cmd);
4134 break;
617c0e06 4135 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4136 ret = core_scsi3_pri_read_full_status(cmd);
4137 break;
617c0e06
CH		 4138 default:
4139 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4140 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4141 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4142 }
4143
6bb35e00
CH		 4144 if (!ret)
4145 target_complete_cmd(cmd, GOOD);
d29a5b6a 4146 return ret;
c66ac9db
NB		 4147}
4148
de103c93
CH		 4149sense_reason_t
4150target_check_reservation(struct se_cmd *cmd)
c66ac9db 4151{
d977f437 4152 struct se_device *dev = cmd->se_dev;
de103c93 4153 sense_reason_t ret;
c66ac9db 4154
d977f437
CH		 4155 if (!cmd->se_sess)
4156 return 0;
4157 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4158 return 0;
4159 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4160 return 0;
c66ac9db 4161
d977f437
CH		 4162 spin_lock(&dev->dev_reservation_lock);
4163 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4164 ret = target_scsi2_reservation_check(cmd);
4165 else
4166 ret = target_scsi3_pr_reservation_check(cmd);
4167 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4168
d977f437 4169 return ret;
c66ac9db 4170}
Linux kernel - Deliverables
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