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target: Minimize SCSI header #include directives
[deliverable/linux.git] / drivers / target / target_core_pr.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_pr.c
3 *
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
6 *
4c76251e 7 * (c) Copyright 2009-2013 Datera, Inc.
c66ac9db
NB		 8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
c66ac9db
NB		 27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/list.h>
0e9b10a9 30#include <linux/file.h>
ba929992 31#include <scsi/scsi_proto.h>
c66ac9db
NB		 32#include <asm/unaligned.h>
33
34#include <target/target_core_base.h>
c4795fb2
CH		 35#include <target/target_core_backend.h>
36#include <target/target_core_fabric.h>
c66ac9db
NB		 37#include <target/target_core_configfs.h>
38
e26d99ae 39#include "target_core_internal.h"
c66ac9db
NB		 40#include "target_core_pr.h"
41#include "target_core_ua.h"
42
43/*
44 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
45 */
46struct pr_transport_id_holder {
47 int dest_local_nexus;
48 struct t10_pr_registration *dest_pr_reg;
49 struct se_portal_group *dest_tpg;
50 struct se_node_acl *dest_node_acl;
51 struct se_dev_entry *dest_se_deve;
52 struct list_head dest_list;
53};
54
d2843c17 55void core_pr_dump_initiator_port(
c66ac9db
NB		 56 struct t10_pr_registration *pr_reg,
57 char *buf,
58 u32 size)
59{
6708bb27 60 if (!pr_reg->isid_present_at_reg)
d2843c17 61 buf[0] = '\0';
c66ac9db 62
d2843c17 63 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
c66ac9db
NB		 64}
65
33ce6a87
AG		 66enum register_type {
67 REGISTER,
68 REGISTER_AND_IGNORE_EXISTING_KEY,
69 REGISTER_AND_MOVE,
70};
71
72enum preempt_type {
73 PREEMPT,
74 PREEMPT_AND_ABORT,
75};
76
c66ac9db 77static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
6c3c9baa 78 struct t10_pr_registration *, int, int);
c66ac9db 79
e673dc92
IT		 80static int is_reservation_holder(
81 struct t10_pr_registration *pr_res_holder,
82 struct t10_pr_registration *pr_reg)
83{
84 int pr_res_type;
85
86 if (pr_res_holder) {
87 pr_res_type = pr_res_holder->pr_res_type;
88
89 return pr_res_holder == pr_reg ||
90 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
91 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
92 }
93 return 0;
94}
95
de103c93
CH		 96static sense_reason_t
97target_scsi2_reservation_check(struct se_cmd *cmd)
c66ac9db 98{
d977f437
CH		 99 struct se_device *dev = cmd->se_dev;
100 struct se_session *sess = cmd->se_sess;
101
102 switch (cmd->t_task_cdb[0]) {
c66ac9db
NB		 103 case INQUIRY:
104 case RELEASE:
105 case RELEASE_10:
106 return 0;
107 default:
d977f437 108 break;
c66ac9db
NB		 109 }
110
d977f437 111 if (!dev->dev_reserved_node_acl || !sess)
c66ac9db
NB		 112 return 0;
113
d977f437 114 if (dev->dev_reserved_node_acl != sess->se_node_acl)
de103c93 115 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 116
117 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
118 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
de103c93 119 return TCM_RESERVATION_CONFLICT;
c66ac9db 120 }
c66ac9db 121
d977f437 122 return 0;
c66ac9db
NB		 123}
124
eacac00c
CH		 125static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
126 struct se_node_acl *, struct se_session *);
127static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
128
087a03b3 129static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
eacac00c
CH		 130{
131 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 132 struct se_device *dev = cmd->se_dev;
eacac00c 133 struct t10_pr_registration *pr_reg;
0fd97ccf 134 struct t10_reservation *pr_tmpl = &dev->t10_pr;
eacac00c
CH		 135 int conflict = 0;
136
eacac00c
CH		 137 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
138 se_sess);
139 if (pr_reg) {
140 /*
141 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
142 * behavior
143 *
144 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
145 * status, but no reservation shall be established and the
146 * persistent reservation shall not be changed, if the command
147 * is received from a) and b) below.
148 *
149 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
150 * status, but the persistent reservation shall not be released,
151 * if the command is received from a) and b)
152 *
153 * a) An I_T nexus that is a persistent reservation holder; or
154 * b) An I_T nexus that is registered if a registrants only or
155 * all registrants type persistent reservation is present.
156 *
157 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
158 * RELEASE(6) command, or RELEASE(10) command shall be processed
159 * as defined in SPC-2.
160 */
161 if (pr_reg->pr_res_holder) {
162 core_scsi3_put_pr_reg(pr_reg);
087a03b3 163 return 1;
eacac00c
CH		 164 }
165 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
166 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
167 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
168 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
169 core_scsi3_put_pr_reg(pr_reg);
087a03b3 170 return 1;
eacac00c
CH		 171 }
172 core_scsi3_put_pr_reg(pr_reg);
173 conflict = 1;
174 } else {
175 /*
176 * Following spc2r20 5.5.1 Reservations overview:
177 *
178 * If a logical unit has executed a PERSISTENT RESERVE OUT
179 * command with the REGISTER or the REGISTER AND IGNORE
180 * EXISTING KEY service action and is still registered by any
181 * initiator, all RESERVE commands and all RELEASE commands
182 * regardless of initiator shall conflict and shall terminate
183 * with a RESERVATION CONFLICT status.
184 */
185 spin_lock(&pr_tmpl->registration_lock);
186 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
187 spin_unlock(&pr_tmpl->registration_lock);
188 }
189
190 if (conflict) {
191 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
192 " while active SPC-3 registrations exist,"
193 " returning RESERVATION_CONFLICT\n");
087a03b3 194 return -EBUSY;
eacac00c
CH		 195 }
196
087a03b3 197 return 0;
eacac00c
CH		 198}
199
de103c93
CH		 200sense_reason_t
201target_scsi2_reservation_release(struct se_cmd *cmd)
c66ac9db
NB		 202{
203 struct se_device *dev = cmd->se_dev;
204 struct se_session *sess = cmd->se_sess;
609234e3 205 struct se_portal_group *tpg;
de103c93 206 int rc;
c66ac9db 207
609234e3 208 if (!sess || !sess->se_tpg)
d29a5b6a 209 goto out;
087a03b3
NB		 210 rc = target_check_scsi2_reservation_conflict(cmd);
211 if (rc == 1)
d29a5b6a 212 goto out;
de103c93
CH		 213 if (rc < 0)
214 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 215
216 spin_lock(&dev->dev_reservation_lock);
d29a5b6a
CH		 217 if (!dev->dev_reserved_node_acl || !sess)
218 goto out_unlock;
219
220 if (dev->dev_reserved_node_acl != sess->se_node_acl)
221 goto out_unlock;
c66ac9db 222
edc318d9
BK		 223 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
224 goto out_unlock;
225
c66ac9db 226 dev->dev_reserved_node_acl = NULL;
0fd97ccf
CH		 227 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
228 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
c66ac9db 229 dev->dev_res_bin_isid = 0;
0fd97ccf 230 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 231 }
609234e3 232 tpg = sess->se_tpg;
6708bb27 233 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
e3d6f909
AG		 234 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
235 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 236 sess->se_node_acl->initiatorname);
c66ac9db 237
d29a5b6a
CH		 238out_unlock:
239 spin_unlock(&dev->dev_reservation_lock);
240out:
de103c93
CH		 241 target_complete_cmd(cmd, GOOD);
242 return 0;
c66ac9db
NB		 243}
244
de103c93
CH		 245sense_reason_t
246target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 247{
248 struct se_device *dev = cmd->se_dev;
249 struct se_session *sess = cmd->se_sess;
609234e3 250 struct se_portal_group *tpg;
de103c93
CH		 251 sense_reason_t ret = 0;
252 int rc;
c66ac9db 253
a1d8b49a
AG		 254 if ((cmd->t_task_cdb[1] & 0x01) &&
255 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 256 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 257 " ILLEGAL_REQUEST\n");
de103c93 258 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 259 }
260 /*
261 * This is currently the case for target_core_mod passthrough struct se_cmd
262 * ops
263 */
609234e3 264 if (!sess || !sess->se_tpg)
d29a5b6a 265 goto out;
087a03b3
NB		 266 rc = target_check_scsi2_reservation_conflict(cmd);
267 if (rc == 1)
d29a5b6a 268 goto out;
c66ac9db 269
de103c93
CH		 270 if (rc < 0)
271 return TCM_RESERVATION_CONFLICT;
272
609234e3 273 tpg = sess->se_tpg;
c66ac9db
NB		 274 spin_lock(&dev->dev_reservation_lock);
275 if (dev->dev_reserved_node_acl &&
276 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 277 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 278 tpg->se_tpg_tfo->get_fabric_name());
6708bb27 279 pr_err("Original reserver LUN: %u %s\n",
e3d6f909 280 cmd->se_lun->unpacked_lun,
c66ac9db 281 dev->dev_reserved_node_acl->initiatorname);
6708bb27 282 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
e3d6f909 283 " from %s \n", cmd->se_lun->unpacked_lun,
c66ac9db
NB		 284 cmd->se_deve->mapped_lun,
285 sess->se_node_acl->initiatorname);
de103c93 286 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 287 goto out_unlock;
c66ac9db
NB		 288 }
289
290 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 291 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 292 if (sess->sess_bin_isid != 0) {
293 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 295 }
6708bb27 296 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
e3d6f909
AG		 297 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
298 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 299 sess->se_node_acl->initiatorname);
c66ac9db 300
d29a5b6a
CH		 301out_unlock:
302 spin_unlock(&dev->dev_reservation_lock);
303out:
6bb35e00
CH		 304 if (!ret)
305 target_complete_cmd(cmd, GOOD);
d29a5b6a 306 return ret;
c66ac9db
NB		 307}
308
c66ac9db
NB		 309
310/*
311 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
312 *
313 * This function is called by those initiator ports who are *NOT*
314 * the active PR reservation holder when a reservation is present.
315 */
316static int core_scsi3_pr_seq_non_holder(
317 struct se_cmd *cmd,
c66ac9db
NB		 318 u32 pr_reg_type)
319{
d977f437 320 unsigned char *cdb = cmd->t_task_cdb;
c66ac9db 321 struct se_dev_entry *se_deve;
e3d6f909 322 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 323 int other_cdb = 0, ignore_reg;
324 int registered_nexus = 0, ret = 1; /* Conflict by default */
325 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
326 int we = 0; /* Write Exclusive */
327 int legacy = 0; /* Act like a legacy device and return
328 * RESERVATION CONFLICT on some CDBs */
c66ac9db 329
f2083241 330 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 331 /*
332 * Determine if the registration should be ignored due to
d977f437 333 * non-matching ISIDs in target_scsi3_pr_reservation_check().
c66ac9db
NB		 334 */
335 ignore_reg = (pr_reg_type & 0x80000000);
336 if (ignore_reg)
337 pr_reg_type &= ~0x80000000;
338
339 switch (pr_reg_type) {
340 case PR_TYPE_WRITE_EXCLUSIVE:
341 we = 1;
342 case PR_TYPE_EXCLUSIVE_ACCESS:
343 /*
344 * Some commands are only allowed for the persistent reservation
345 * holder.
346 */
347 if ((se_deve->def_pr_registered) && !(ignore_reg))
348 registered_nexus = 1;
349 break;
350 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
351 we = 1;
352 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
353 /*
354 * Some commands are only allowed for registered I_T Nexuses.
355 */
356 reg_only = 1;
357 if ((se_deve->def_pr_registered) && !(ignore_reg))
358 registered_nexus = 1;
359 break;
360 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
361 we = 1;
362 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
363 /*
364 * Each registered I_T Nexus is a reservation holder.
365 */
366 all_reg = 1;
367 if ((se_deve->def_pr_registered) && !(ignore_reg))
368 registered_nexus = 1;
369 break;
370 default:
e3d6f909 371 return -EINVAL;
c66ac9db
NB		 372 }
373 /*
374 * Referenced from spc4r17 table 45 for *NON* PR holder access
375 */
376 switch (cdb[0]) {
377 case SECURITY_PROTOCOL_IN:
378 if (registered_nexus)
379 return 0;
380 ret = (we) ? 0 : 1;
381 break;
382 case MODE_SENSE:
383 case MODE_SENSE_10:
384 case READ_ATTRIBUTE:
385 case READ_BUFFER:
386 case RECEIVE_DIAGNOSTIC:
387 if (legacy) {
388 ret = 1;
389 break;
390 }
391 if (registered_nexus) {
392 ret = 0;
393 break;
394 }
395 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
396 break;
397 case PERSISTENT_RESERVE_OUT:
398 /*
399 * This follows PERSISTENT_RESERVE_OUT service actions that
400 * are allowed in the presence of various reservations.
401 * See spc4r17, table 46
402 */
403 switch (cdb[1] & 0x1f) {
404 case PRO_CLEAR:
405 case PRO_PREEMPT:
406 case PRO_PREEMPT_AND_ABORT:
407 ret = (registered_nexus) ? 0 : 1;
408 break;
409 case PRO_REGISTER:
410 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
411 ret = 0;
412 break;
413 case PRO_REGISTER_AND_MOVE:
414 case PRO_RESERVE:
415 ret = 1;
416 break;
417 case PRO_RELEASE:
418 ret = (registered_nexus) ? 0 : 1;
419 break;
420 default:
6708bb27 421 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 422 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 423 return -EINVAL;
c66ac9db
NB		 424 }
425 break;
426 case RELEASE:
427 case RELEASE_10:
eacac00c 428 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 429 ret = 0;
430 break;
431 case RESERVE:
432 case RESERVE_10:
eacac00c 433 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 434 ret = 0;
435 break;
436 case TEST_UNIT_READY:
437 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
438 break;
439 case MAINTENANCE_IN:
440 switch (cdb[1] & 0x1f) {
441 case MI_MANAGEMENT_PROTOCOL_IN:
442 if (registered_nexus) {
443 ret = 0;
444 break;
445 }
446 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
447 break;
448 case MI_REPORT_SUPPORTED_OPERATION_CODES:
449 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
450 if (legacy) {
451 ret = 1;
452 break;
453 }
454 if (registered_nexus) {
455 ret = 0;
456 break;
457 }
458 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
459 break;
460 case MI_REPORT_ALIASES:
461 case MI_REPORT_IDENTIFYING_INFORMATION:
462 case MI_REPORT_PRIORITY:
463 case MI_REPORT_TARGET_PGS:
464 case MI_REPORT_TIMESTAMP:
465 ret = 0; /* Allowed */
466 break;
467 default:
6708bb27 468 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 469 (cdb[1] & 0x1f));
e3d6f909 470 return -EINVAL;
c66ac9db
NB		 471 }
472 break;
473 case ACCESS_CONTROL_IN:
474 case ACCESS_CONTROL_OUT:
475 case INQUIRY:
476 case LOG_SENSE:
85686f69 477 case SERVICE_ACTION_IN_12:
c66ac9db
NB		 478 case REPORT_LUNS:
479 case REQUEST_SENSE:
6816966a 480 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 481 ret = 0; /*/ Allowed CDBs */
482 break;
483 default:
484 other_cdb = 1;
485 break;
486 }
487 /*
25985edc 488 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 489 * statement.
490 */
6708bb27 491 if (!ret && !other_cdb) {
125d0119 492 pr_debug("Allowing explicit CDB: 0x%02x for %s"
c66ac9db
NB		 493 " reservation holder\n", cdb[0],
494 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 495
c66ac9db
NB		 496 return ret;
497 }
498 /*
499 * Check if write exclusive initiator ports *NOT* holding the
500 * WRITE_EXCLUSIVE_* reservation.
501 */
ee1b1b9c 502 if (we && !registered_nexus) {
c66ac9db
NB		 503 if (cmd->data_direction == DMA_TO_DEVICE) {
504 /*
505 * Conflict for write exclusive
506 */
6708bb27 507 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 508 " %s CDB: 0x%02x to %s reservation\n",
509 transport_dump_cmd_direction(cmd),
510 se_sess->se_node_acl->initiatorname, cdb[0],
511 core_scsi3_pr_dump_type(pr_reg_type));
512 return 1;
513 } else {
514 /*
515 * Allow non WRITE CDBs for all Write Exclusive
516 * PR TYPEs to pass for registered and
517 * non-registered_nexuxes NOT holding the reservation.
518 *
519 * We only make noise for the unregisterd nexuses,
520 * as we expect registered non-reservation holding
521 * nexuses to issue CDBs.
522 */
8b1e1244 523
6708bb27 524 if (!registered_nexus) {
125d0119 525 pr_debug("Allowing implicit CDB: 0x%02x"
c66ac9db
NB		 526 " for %s reservation on unregistered"
527 " nexus\n", cdb[0],
528 core_scsi3_pr_dump_type(pr_reg_type));
529 }
8b1e1244 530
c66ac9db
NB		 531 return 0;
532 }
533 } else if ((reg_only) || (all_reg)) {
534 if (registered_nexus) {
535 /*
536 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
537 * allow commands from registered nexuses.
538 */
8b1e1244 539
125d0119 540 pr_debug("Allowing implicit CDB: 0x%02x for %s"
c66ac9db
NB		 541 " reservation\n", cdb[0],
542 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 543
c66ac9db
NB		 544 return 0;
545 }
1ecc7586
LD		 546 } else if (we && registered_nexus) {
547 /*
548 * Reads are allowed for Write Exclusive locks
549 * from all registrants.
550 */
551 if (cmd->data_direction == DMA_FROM_DEVICE) {
552 pr_debug("Allowing READ CDB: 0x%02x for %s"
553 " reservation\n", cdb[0],
554 core_scsi3_pr_dump_type(pr_reg_type));
555
556 return 0;
557 }
c66ac9db 558 }
6708bb27 559 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 560 " for %s reservation\n", transport_dump_cmd_direction(cmd),
561 (registered_nexus) ? "" : "un",
562 se_sess->se_node_acl->initiatorname, cdb[0],
563 core_scsi3_pr_dump_type(pr_reg_type));
564
565 return 1; /* Conflict by default */
566}
567
de103c93
CH		 568static sense_reason_t
569target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 570{
571 struct se_device *dev = cmd->se_dev;
572 struct se_session *sess = cmd->se_sess;
573 u32 pr_reg_type;
574
575 if (!dev->dev_pr_res_holder)
576 return 0;
577
578 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
579 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
580 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
581 goto check_nonholder;
582
583 if (dev->dev_pr_res_holder->isid_present_at_reg) {
584 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
585 sess->sess_bin_isid) {
586 pr_reg_type |= 0x80000000;
587 goto check_nonholder;
588 }
589 }
590
591 return 0;
592
593check_nonholder:
594 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
de103c93 595 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 596 return 0;
597}
598
c66ac9db
NB		 599static u32 core_scsi3_pr_generation(struct se_device *dev)
600{
c66ac9db 601 u32 prg;
0fd97ccf 602
c66ac9db
NB		 603 /*
604 * PRGeneration field shall contain the value of a 32-bit wrapping
605 * counter mainted by the device server.
606 *
607 * Note that this is done regardless of Active Persist across
608 * Target PowerLoss (APTPL)
609 *
610 * See spc4r17 section 6.3.12 READ_KEYS service action
611 */
612 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 613 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 614 spin_unlock(&dev->dev_reservation_lock);
615
616 return prg;
617}
618
c66ac9db
NB		 619static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
620 struct se_device *dev,
621 struct se_node_acl *nacl,
622 struct se_dev_entry *deve,
623 unsigned char *isid,
624 u64 sa_res_key,
625 int all_tg_pt,
626 int aptpl)
627{
c66ac9db
NB		 628 struct t10_pr_registration *pr_reg;
629
630 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 631 if (!pr_reg) {
632 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 633 return NULL;
634 }
635
c66ac9db
NB		 636 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
637 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
638 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
641 atomic_set(&pr_reg->pr_res_holders, 0);
642 pr_reg->pr_reg_nacl = nacl;
643 pr_reg->pr_reg_deve = deve;
644 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
645 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
646 pr_reg->pr_res_key = sa_res_key;
647 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
648 pr_reg->pr_reg_aptpl = aptpl;
649 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
650 /*
651 * If an ISID value for this SCSI Initiator Port exists,
652 * save it to the registration now.
653 */
654 if (isid != NULL) {
655 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
656 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
657 pr_reg->isid_present_at_reg = 1;
658 }
659
660 return pr_reg;
661}
662
663static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
664static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
665
666/*
667 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
668 * modes.
669 */
670static struct t10_pr_registration *__core_scsi3_alloc_registration(
671 struct se_device *dev,
672 struct se_node_acl *nacl,
673 struct se_dev_entry *deve,
674 unsigned char *isid,
675 u64 sa_res_key,
676 int all_tg_pt,
677 int aptpl)
678{
679 struct se_dev_entry *deve_tmp;
680 struct se_node_acl *nacl_tmp;
681 struct se_port *port, *port_tmp;
9ac8928e 682 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db
NB		 683 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
684 int ret;
685 /*
686 * Create a registration for the I_T Nexus upon which the
687 * PROUT REGISTER was received.
688 */
689 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
690 sa_res_key, all_tg_pt, aptpl);
6708bb27 691 if (!pr_reg)
c66ac9db
NB		 692 return NULL;
693 /*
694 * Return pointer to pr_reg for ALL_TG_PT=0
695 */
6708bb27 696 if (!all_tg_pt)
c66ac9db
NB		 697 return pr_reg;
698 /*
699 * Create list of matching SCSI Initiator Port registrations
700 * for ALL_TG_PT=1
701 */
702 spin_lock(&dev->se_port_lock);
703 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
33940d09 704 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 705 spin_unlock(&dev->se_port_lock);
706
707 spin_lock_bh(&port->sep_alua_lock);
708 list_for_each_entry(deve_tmp, &port->sep_alua_list,
709 alua_port_list) {
710 /*
711 * This pointer will be NULL for demo mode MappedLUNs
125d0119 712 * that have not been make explicit via a ConfigFS
c66ac9db
NB		 713 * MappedLUN group for the SCSI Initiator Node ACL.
714 */
6708bb27 715 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 716 continue;
717
718 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
719 /*
720 * Skip the matching struct se_node_acl that is allocated
721 * above..
722 */
723 if (nacl == nacl_tmp)
724 continue;
725 /*
726 * Only perform PR registrations for target ports on
727 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
728 * arrived.
729 */
730 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
731 continue;
732 /*
733 * Look for a matching Initiator Node ACL in ASCII format
734 */
735 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
736 continue;
737
33940d09 738 atomic_inc_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 739 spin_unlock_bh(&port->sep_alua_lock);
740 /*
741 * Grab a configfs group dependency that is released
742 * for the exception path at label out: below, or upon
743 * completion of adding ALL_TG_PT=1 registrations in
744 * __core_scsi3_add_registration()
745 */
746 ret = core_scsi3_lunacl_depend_item(deve_tmp);
747 if (ret < 0) {
6708bb27 748 pr_err("core_scsi3_lunacl_depend"
c66ac9db 749 "_item() failed\n");
33940d09
JE		 750 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
751 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 752 goto out;
753 }
754 /*
755 * Located a matching SCSI Initiator Port on a different
756 * port, allocate the pr_reg_atp and attach it to the
757 * pr_reg->pr_reg_atp_list that will be processed once
758 * the original *pr_reg is processed in
759 * __core_scsi3_add_registration()
760 */
761 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
762 nacl_tmp, deve_tmp, NULL,
763 sa_res_key, all_tg_pt, aptpl);
6708bb27 764 if (!pr_reg_atp) {
33940d09
JE		 765 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
766 atomic_dec_mb(&deve_tmp->pr_ref_count);
c66ac9db
NB		 767 core_scsi3_lunacl_undepend_item(deve_tmp);
768 goto out;
769 }
770
771 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
772 &pr_reg->pr_reg_atp_list);
773 spin_lock_bh(&port->sep_alua_lock);
774 }
775 spin_unlock_bh(&port->sep_alua_lock);
776
777 spin_lock(&dev->se_port_lock);
33940d09 778 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
c66ac9db
NB		 779 }
780 spin_unlock(&dev->se_port_lock);
781
782 return pr_reg;
783out:
784 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
785 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
786 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
787 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
788 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
789 }
790 kmem_cache_free(t10_pr_reg_cache, pr_reg);
791 return NULL;
792}
793
794int core_scsi3_alloc_aptpl_registration(
e3d6f909 795 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 796 u64 sa_res_key,
797 unsigned char *i_port,
798 unsigned char *isid,
799 u32 mapped_lun,
800 unsigned char *t_port,
801 u16 tpgt,
802 u32 target_lun,
803 int res_holder,
804 int all_tg_pt,
805 u8 type)
806{
807 struct t10_pr_registration *pr_reg;
808
6708bb27
AG		 809 if (!i_port || !t_port || !sa_res_key) {
810 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 811 return -EINVAL;
c66ac9db
NB		 812 }
813
814 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 815 if (!pr_reg) {
816 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 817 return -ENOMEM;
c66ac9db 818 }
c66ac9db
NB		 819
820 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
821 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
822 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
823 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
824 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
825 atomic_set(&pr_reg->pr_res_holders, 0);
826 pr_reg->pr_reg_nacl = NULL;
827 pr_reg->pr_reg_deve = NULL;
828 pr_reg->pr_res_mapped_lun = mapped_lun;
829 pr_reg->pr_aptpl_target_lun = target_lun;
830 pr_reg->pr_res_key = sa_res_key;
831 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
832 pr_reg->pr_reg_aptpl = 1;
833 pr_reg->pr_reg_tg_pt_lun = NULL;
834 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
835 pr_reg->pr_res_type = type;
836 /*
837 * If an ISID value had been saved in APTPL metadata for this
838 * SCSI Initiator Port, restore it now.
839 */
840 if (isid != NULL) {
841 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
842 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
843 pr_reg->isid_present_at_reg = 1;
844 }
845 /*
846 * Copy the i_port and t_port information from caller.
847 */
848 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
849 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
850 pr_reg->pr_reg_tpgt = tpgt;
851 /*
852 * Set pr_res_holder from caller, the pr_reg who is the reservation
853 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
854 * the Initiator Node LUN ACL from the fabric module is created for
855 * this registration.
856 */
857 pr_reg->pr_res_holder = res_holder;
858
859 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 860 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 861 " metadata\n", (res_holder) ? "+reservation" : "");
862 return 0;
863}
864
865static void core_scsi3_aptpl_reserve(
866 struct se_device *dev,
867 struct se_portal_group *tpg,
868 struct se_node_acl *node_acl,
869 struct t10_pr_registration *pr_reg)
870{
871 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 872
873 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 874 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 875
876 spin_lock(&dev->dev_reservation_lock);
877 dev->dev_pr_res_holder = pr_reg;
878 spin_unlock(&dev->dev_reservation_lock);
879
6708bb27 880 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 881 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 882 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 883 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
884 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 885 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 886 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
d2843c17 887 i_buf);
c66ac9db
NB		 888}
889
890static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
33ce6a87 891 struct t10_pr_registration *, enum register_type, int);
c66ac9db
NB		 892
893static int __core_scsi3_check_aptpl_registration(
894 struct se_device *dev,
895 struct se_portal_group *tpg,
896 struct se_lun *lun,
897 u32 target_lun,
898 struct se_node_acl *nacl,
899 struct se_dev_entry *deve)
900{
901 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 902 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 903 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
904 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
905 u16 tpgt;
906
907 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
908 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
909 /*
910 * Copy Initiator Port information from struct se_node_acl
911 */
912 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
913 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 914 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
915 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 916 /*
917 * Look for the matching registrations+reservation from those
918 * created from APTPL metadata. Note that multiple registrations
919 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
920 * TransportIDs.
921 */
922 spin_lock(&pr_tmpl->aptpl_reg_lock);
923 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
924 pr_reg_aptpl_list) {
92404e60 925
6708bb27 926 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 927 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
928 !(strcmp(pr_reg->pr_tport, t_port)) &&
929 (pr_reg->pr_reg_tpgt == tpgt) &&
930 (pr_reg->pr_aptpl_target_lun == target_lun)) {
931
932 pr_reg->pr_reg_nacl = nacl;
933 pr_reg->pr_reg_deve = deve;
934 pr_reg->pr_reg_tg_pt_lun = lun;
935
936 list_del(&pr_reg->pr_reg_aptpl_list);
937 spin_unlock(&pr_tmpl->aptpl_reg_lock);
938 /*
939 * At this point all of the pointers in *pr_reg will
940 * be setup, so go ahead and add the registration.
941 */
942
943 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
944 /*
945 * If this registration is the reservation holder,
946 * make that happen now..
947 */
948 if (pr_reg->pr_res_holder)
949 core_scsi3_aptpl_reserve(dev, tpg,
950 nacl, pr_reg);
951 /*
952 * Reenable pr_aptpl_active to accept new metadata
953 * updates once the SCSI device is active again..
954 */
955 spin_lock(&pr_tmpl->aptpl_reg_lock);
956 pr_tmpl->pr_aptpl_active = 1;
957 }
958 }
959 spin_unlock(&pr_tmpl->aptpl_reg_lock);
960
961 return 0;
962}
963
964int core_scsi3_check_aptpl_registration(
965 struct se_device *dev,
966 struct se_portal_group *tpg,
967 struct se_lun *lun,
e2480563
NB		 968 struct se_node_acl *nacl,
969 u32 mapped_lun)
c66ac9db 970{
e2480563 971 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
c66ac9db 972
d977f437 973 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 974 return 0;
975
976 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
977 lun->unpacked_lun, nacl, deve);
978}
979
980static void __core_scsi3_dump_registration(
9ac8928e 981 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 982 struct se_device *dev,
983 struct se_node_acl *nacl,
984 struct t10_pr_registration *pr_reg,
33ce6a87 985 enum register_type register_type)
c66ac9db
NB		 986{
987 struct se_portal_group *se_tpg = nacl->se_tpg;
988 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 989
990 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
d2843c17 991 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 992
6708bb27 993 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
33ce6a87
AG		 994 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
995 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
c66ac9db 996 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
d2843c17 997 i_buf);
6708bb27 998 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 999 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1000 tfo->tpg_get_tag(se_tpg));
6708bb27 1001 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1002 " Port(s)\n", tfo->get_fabric_name(),
1003 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1004 dev->transport->name);
6708bb27 1005 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1006 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1007 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1008 pr_reg->pr_reg_aptpl);
1009}
1010
1011/*
1012 * this function can be called with struct se_device->dev_reservation_lock
1013 * when register_move = 1
1014 */
1015static void __core_scsi3_add_registration(
1016 struct se_device *dev,
1017 struct se_node_acl *nacl,
1018 struct t10_pr_registration *pr_reg,
33ce6a87 1019 enum register_type register_type,
c66ac9db
NB		 1020 int register_move)
1021{
9ac8928e 1022 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 1023 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1024 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1025
1026 /*
1027 * Increment PRgeneration counter for struct se_device upon a successful
1028 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1029 *
1030 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1031 * action, the struct se_device->dev_reservation_lock will already be held,
1032 * so we do not call core_scsi3_pr_generation() which grabs the lock
1033 * for the REGISTER.
1034 */
1035 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1036 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1037 core_scsi3_pr_generation(dev);
1038
1039 spin_lock(&pr_tmpl->registration_lock);
1040 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1041 pr_reg->pr_reg_deve->def_pr_registered = 1;
1042
1043 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1044 spin_unlock(&pr_tmpl->registration_lock);
1045 /*
1046 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1047 */
6708bb27 1048 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1049 return;
1050 /*
1051 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1052 * allocated in __core_scsi3_alloc_registration()
1053 */
1054 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1055 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1056 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1057
1058 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1059
1060 spin_lock(&pr_tmpl->registration_lock);
1061 list_add_tail(&pr_reg_tmp->pr_reg_list,
1062 &pr_tmpl->registration_list);
1063 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1064
1065 __core_scsi3_dump_registration(tfo, dev,
1066 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1067 register_type);
1068 spin_unlock(&pr_tmpl->registration_lock);
1069 /*
1070 * Drop configfs group dependency reference from
1071 * __core_scsi3_alloc_registration()
1072 */
1073 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1074 }
1075}
1076
1077static int core_scsi3_alloc_registration(
1078 struct se_device *dev,
1079 struct se_node_acl *nacl,
1080 struct se_dev_entry *deve,
1081 unsigned char *isid,
1082 u64 sa_res_key,
1083 int all_tg_pt,
1084 int aptpl,
33ce6a87 1085 enum register_type register_type,
c66ac9db
NB		 1086 int register_move)
1087{
1088 struct t10_pr_registration *pr_reg;
1089
1090 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1091 sa_res_key, all_tg_pt, aptpl);
6708bb27 1092 if (!pr_reg)
e3d6f909 1093 return -EPERM;
c66ac9db
NB		 1094
1095 __core_scsi3_add_registration(dev, nacl, pr_reg,
1096 register_type, register_move);
1097 return 0;
1098}
1099
1100static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1101 struct se_device *dev,
1102 struct se_node_acl *nacl,
1103 unsigned char *isid)
1104{
0fd97ccf 1105 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1106 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1107 struct se_portal_group *tpg;
1108
1109 spin_lock(&pr_tmpl->registration_lock);
1110 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1111 &pr_tmpl->registration_list, pr_reg_list) {
1112 /*
1113 * First look for a matching struct se_node_acl
1114 */
1115 if (pr_reg->pr_reg_nacl != nacl)
1116 continue;
1117
1118 tpg = pr_reg->pr_reg_nacl->se_tpg;
1119 /*
1120 * If this registration does NOT contain a fabric provided
1121 * ISID, then we have found a match.
1122 */
6708bb27 1123 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1124 /*
1125 * Determine if this SCSI device server requires that
1126 * SCSI Intiatior TransportID w/ ISIDs is enforced
1127 * for fabric modules (iSCSI) requiring them.
1128 */
e3d6f909 1129 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1130 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1131 continue;
1132 }
33940d09 1133 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1134 spin_unlock(&pr_tmpl->registration_lock);
1135 return pr_reg;
1136 }
1137 /*
1138 * If the *pr_reg contains a fabric defined ISID for multi-value
1139 * SCSI Initiator Port TransportIDs, then we expect a valid
1140 * matching ISID to be provided by the local SCSI Initiator Port.
1141 */
6708bb27 1142 if (!isid)
c66ac9db
NB		 1143 continue;
1144 if (strcmp(isid, pr_reg->pr_reg_isid))
1145 continue;
1146
33940d09 1147 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1148 spin_unlock(&pr_tmpl->registration_lock);
1149 return pr_reg;
1150 }
1151 spin_unlock(&pr_tmpl->registration_lock);
1152
1153 return NULL;
1154}
1155
1156static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1157 struct se_device *dev,
1158 struct se_node_acl *nacl,
1159 struct se_session *sess)
1160{
1161 struct se_portal_group *tpg = nacl->se_tpg;
1162 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1163
e3d6f909 1164 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1165 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1166 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1167 PR_REG_ISID_LEN);
1168 isid_ptr = &buf[0];
1169 }
1170
1171 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1172}
1173
1174static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1175{
33940d09 1176 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 1177}
1178
125d0119 1179static int core_scsi3_check_implicit_release(
c66ac9db
NB		 1180 struct se_device *dev,
1181 struct t10_pr_registration *pr_reg)
1182{
1183 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1184 struct t10_pr_registration *pr_res_holder;
1185 int ret = 0;
1186
1187 spin_lock(&dev->dev_reservation_lock);
1188 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1189 if (!pr_res_holder) {
c66ac9db
NB		 1190 spin_unlock(&dev->dev_reservation_lock);
1191 return ret;
1192 }
1193 if (pr_res_holder == pr_reg) {
1194 /*
125d0119 1195 * Perform an implicit RELEASE if the registration that
c66ac9db
NB		 1196 * is being released is holding the reservation.
1197 *
1198 * From spc4r17, section 5.7.11.1:
1199 *
1200 * e) If the I_T nexus is the persistent reservation holder
1201 * and the persistent reservation is not an all registrants
1202 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1203 * service action or REGISTER AND IGNORE EXISTING KEY
1204 * service action with the SERVICE ACTION RESERVATION KEY
1205 * field set to zero (see 5.7.11.3).
1206 */
6c3c9baa 1207 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
c66ac9db
NB		 1208 ret = 1;
1209 /*
1210 * For 'All Registrants' reservation types, all existing
1211 * registrations are still processed as reservation holders
1212 * in core_scsi3_pr_seq_non_holder() after the initial
125d0119 1213 * reservation holder is implicitly released here.
c66ac9db
NB		 1214 */
1215 } else if (pr_reg->pr_reg_all_tg_pt &&
1216 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1217 pr_reg->pr_reg_nacl->initiatorname)) &&
1218 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1219 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1220 " UNREGISTER while existing reservation with matching"
1221 " key 0x%016Lx is present from another SCSI Initiator"
1222 " Port\n", pr_reg->pr_res_key);
e3d6f909 1223 ret = -EPERM;
c66ac9db
NB		 1224 }
1225 spin_unlock(&dev->dev_reservation_lock);
1226
1227 return ret;
1228}
1229
1230/*
e3d6f909 1231 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1232 */
1233static void __core_scsi3_free_registration(
1234 struct se_device *dev,
1235 struct t10_pr_registration *pr_reg,
1236 struct list_head *preempt_and_abort_list,
1237 int dec_holders)
cb0df4d3
BVA		 1238 __releases(&pr_tmpl->registration_lock)
1239 __acquires(&pr_tmpl->registration_lock)
c66ac9db 1240{
9ac8928e 1241 const struct target_core_fabric_ops *tfo =
c66ac9db 1242 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1243 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1244 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 1245
1246 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1247 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 1248
1249 pr_reg->pr_reg_deve->def_pr_registered = 0;
1250 pr_reg->pr_reg_deve->pr_res_key = 0;
6c3c9baa
NB		 1251 if (!list_empty(&pr_reg->pr_reg_list))
1252 list_del(&pr_reg->pr_reg_list);
c66ac9db
NB		 1253 /*
1254 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1255 * so call core_scsi3_put_pr_reg() to decrement our reference.
1256 */
1257 if (dec_holders)
1258 core_scsi3_put_pr_reg(pr_reg);
1259 /*
1260 * Wait until all reference from any other I_T nexuses for this
1261 * *pr_reg have been released. Because list_del() is called above,
1262 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1263 * count back to zero, and we release *pr_reg.
1264 */
1265 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1266 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1267 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1268 tfo->get_fabric_name());
1269 cpu_relax();
1270 spin_lock(&pr_tmpl->registration_lock);
1271 }
1272
6708bb27 1273 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1274 " Node: %s%s\n", tfo->get_fabric_name(),
1275 pr_reg->pr_reg_nacl->initiatorname,
d2843c17 1276 i_buf);
6708bb27 1277 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1278 " Port(s)\n", tfo->get_fabric_name(),
1279 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1280 dev->transport->name);
6708bb27 1281 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1282 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1283 pr_reg->pr_res_generation);
1284
6708bb27 1285 if (!preempt_and_abort_list) {
c66ac9db
NB		 1286 pr_reg->pr_reg_deve = NULL;
1287 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 1288 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1289 return;
1290 }
1291 /*
1292 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1293 * are released once the ABORT_TASK_SET has completed..
1294 */
1295 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1296}
1297
1298void core_scsi3_free_pr_reg_from_nacl(
1299 struct se_device *dev,
1300 struct se_node_acl *nacl)
1301{
0fd97ccf 1302 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 1303 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
6c3c9baa 1304 bool free_reg = false;
c66ac9db
NB		 1305 /*
1306 * If the passed se_node_acl matches the reservation holder,
1307 * release the reservation.
1308 */
1309 spin_lock(&dev->dev_reservation_lock);
1310 pr_res_holder = dev->dev_pr_res_holder;
1311 if ((pr_res_holder != NULL) &&
6c3c9baa
NB		 1312 (pr_res_holder->pr_reg_nacl == nacl)) {
1313 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1314 free_reg = true;
1315 }
c66ac9db
NB		 1316 spin_unlock(&dev->dev_reservation_lock);
1317 /*
1318 * Release any registration associated with the struct se_node_acl.
1319 */
1320 spin_lock(&pr_tmpl->registration_lock);
6c3c9baa
NB		 1321 if (pr_res_holder && free_reg)
1322 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1323
c66ac9db
NB		 1324 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1325 &pr_tmpl->registration_list, pr_reg_list) {
1326
1327 if (pr_reg->pr_reg_nacl != nacl)
1328 continue;
1329
1330 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1331 }
1332 spin_unlock(&pr_tmpl->registration_lock);
1333}
1334
1335void core_scsi3_free_all_registrations(
1336 struct se_device *dev)
1337{
0fd97ccf 1338 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1339 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1340
1341 spin_lock(&dev->dev_reservation_lock);
1342 pr_res_holder = dev->dev_pr_res_holder;
1343 if (pr_res_holder != NULL) {
1344 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1345 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 1346 pr_res_holder, 0, 0);
c66ac9db
NB		 1347 }
1348 spin_unlock(&dev->dev_reservation_lock);
1349
1350 spin_lock(&pr_tmpl->registration_lock);
1351 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1352 &pr_tmpl->registration_list, pr_reg_list) {
1353
1354 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1355 }
1356 spin_unlock(&pr_tmpl->registration_lock);
1357
1358 spin_lock(&pr_tmpl->aptpl_reg_lock);
1359 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1360 pr_reg_aptpl_list) {
1361 list_del(&pr_reg->pr_reg_aptpl_list);
c66ac9db
NB		 1362 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1363 }
1364 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1365}
1366
1367static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1368{
e3d6f909 1369 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1370 &tpg->tpg_group.cg_item);
1371}
1372
1373static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1374{
e3d6f909 1375 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1376 &tpg->tpg_group.cg_item);
1377
33940d09 1378 atomic_dec_mb(&tpg->tpg_pr_ref_count);
c66ac9db
NB		 1379}
1380
1381static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1382{
1383 struct se_portal_group *tpg = nacl->se_tpg;
1384
1385 if (nacl->dynamic_node_acl)
1386 return 0;
1387
e3d6f909 1388 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1389 &nacl->acl_group.cg_item);
1390}
1391
1392static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1393{
1394 struct se_portal_group *tpg = nacl->se_tpg;
1395
1396 if (nacl->dynamic_node_acl) {
33940d09 1397 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1398 return;
1399 }
1400
e3d6f909 1401 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1402 &nacl->acl_group.cg_item);
1403
33940d09 1404 atomic_dec_mb(&nacl->acl_pr_ref_count);
c66ac9db
NB		 1405}
1406
1407static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1408{
1409 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1410 struct se_node_acl *nacl;
1411 struct se_portal_group *tpg;
1412 /*
1413 * For nacl->dynamic_node_acl=1
1414 */
6708bb27 1415 if (!lun_acl)
c66ac9db
NB		 1416 return 0;
1417
1418 nacl = lun_acl->se_lun_nacl;
1419 tpg = nacl->se_tpg;
1420
e3d6f909 1421 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1422 &lun_acl->se_lun_group.cg_item);
1423}
1424
1425static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1426{
1427 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1428 struct se_node_acl *nacl;
1429 struct se_portal_group *tpg;
1430 /*
1431 * For nacl->dynamic_node_acl=1
1432 */
6708bb27 1433 if (!lun_acl) {
33940d09 1434 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1435 return;
1436 }
1437 nacl = lun_acl->se_lun_nacl;
1438 tpg = nacl->se_tpg;
1439
e3d6f909 1440 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1441 &lun_acl->se_lun_group.cg_item);
1442
33940d09 1443 atomic_dec_mb(&se_deve->pr_ref_count);
c66ac9db
NB		 1444}
1445
de103c93
CH		 1446static sense_reason_t
1447core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1448 struct se_cmd *cmd,
1449 struct se_portal_group *tpg,
1450 unsigned char *l_isid,
1451 u64 sa_res_key,
1452 int all_tg_pt,
1453 int aptpl)
1454{
5951146d 1455 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1456 struct se_port *tmp_port;
1457 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1458 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1459 struct se_node_acl *dest_node_acl = NULL;
1460 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1461 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1462 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1463 LIST_HEAD(tid_dest_list);
c66ac9db 1464 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
9ac8928e 1465 const struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1466 unsigned char *buf;
c66ac9db 1467 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
13ba564c 1468 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
de103c93 1469 sense_reason_t ret;
c66ac9db 1470 u32 tpdl, tid_len = 0;
d2843c17 1471 int dest_local_nexus;
c66ac9db
NB		 1472 u32 dest_rtpi = 0;
1473
f2083241 1474 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1475 /*
1476 * Allocate a struct pr_transport_id_holder and setup the
1477 * local_node_acl and local_se_deve pointers and add to
1478 * struct list_head tid_dest_list for add registration
1479 * processing in the loop of tid_dest_list below.
1480 */
1481 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1482 if (!tidh_new) {
1483 pr_err("Unable to allocate tidh_new\n");
de103c93 1484 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1485 }
1486 INIT_LIST_HEAD(&tidh_new->dest_list);
1487 tidh_new->dest_tpg = tpg;
1488 tidh_new->dest_node_acl = se_sess->se_node_acl;
1489 tidh_new->dest_se_deve = local_se_deve;
1490
5951146d 1491 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1492 se_sess->se_node_acl, local_se_deve, l_isid,
1493 sa_res_key, all_tg_pt, aptpl);
6708bb27 1494 if (!local_pr_reg) {
c66ac9db 1495 kfree(tidh_new);
de103c93 1496 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1497 }
1498 tidh_new->dest_pr_reg = local_pr_reg;
1499 /*
1500 * The local I_T nexus does not hold any configfs dependances,
1501 * so we set tid_h->dest_local_nexus=1 to prevent the
1502 * configfs_undepend_item() calls in the tid_dest_list loops below.
1503 */
1504 tidh_new->dest_local_nexus = 1;
1505 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1506
0d7f1299
PB		 1507 if (cmd->data_length < 28) {
1508 pr_warn("SPC-PR: Received PR OUT parameter list"
1509 " length too small: %u\n", cmd->data_length);
de103c93 1510 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1511 goto out;
1512 }
1513
4949314c 1514 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1515 if (!buf) {
1516 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1517 goto out;
1518 }
1519
c66ac9db
NB		 1520 /*
1521 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1522 * first extract TransportID Parameter Data Length, and make sure
1523 * the value matches up to the SCSI expected data transfer length.
1524 */
1525 tpdl = (buf[24] & 0xff) << 24;
1526 tpdl |= (buf[25] & 0xff) << 16;
1527 tpdl |= (buf[26] & 0xff) << 8;
1528 tpdl |= buf[27] & 0xff;
1529
1530 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1531 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1532 " does not equal CDB data_length: %u\n", tpdl,
1533 cmd->data_length);
de103c93
CH		 1534 ret = TCM_INVALID_PARAMETER_LIST;
1535 goto out_unmap;
c66ac9db
NB		 1536 }
1537 /*
1538 * Start processing the received transport IDs using the
1539 * receiving I_T Nexus portal's fabric dependent methods to
1540 * obtain the SCSI Initiator Port/Device Identifiers.
1541 */
1542 ptr = &buf[28];
1543
1544 while (tpdl > 0) {
1545 proto_ident = (ptr[0] & 0x0f);
1546 dest_tpg = NULL;
1547
1548 spin_lock(&dev->se_port_lock);
1549 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1550 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1551 if (!tmp_tpg)
c66ac9db 1552 continue;
e3d6f909 1553 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1554 if (!tmp_tf_ops)
c66ac9db 1555 continue;
6708bb27
AG		 1556 if (!tmp_tf_ops->get_fabric_proto_ident ||
1557 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1558 continue;
1559 /*
1560 * Look for the matching proto_ident provided by
1561 * the received TransportID
1562 */
1563 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1564 if (tmp_proto_ident != proto_ident)
1565 continue;
1566 dest_rtpi = tmp_port->sep_rtpi;
1567
1568 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1569 tmp_tpg, (const char *)ptr, &tid_len,
1570 &iport_ptr);
6708bb27 1571 if (!i_str)
c66ac9db
NB		 1572 continue;
1573
33940d09 1574 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
c66ac9db
NB		 1575 spin_unlock(&dev->se_port_lock);
1576
de103c93 1577 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
6708bb27 1578 pr_err(" core_scsi3_tpg_depend_item()"
c66ac9db 1579 " for tmp_tpg\n");
33940d09 1580 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
de103c93
CH		 1581 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1582 goto out_unmap;
c66ac9db
NB		 1583 }
1584 /*
35d1efe8 1585 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1586 * from the decoded fabric module specific TransportID
1587 * at *i_str.
1588 */
28638887 1589 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1590 dest_node_acl = __core_tpg_get_initiator_node_acl(
1591 tmp_tpg, i_str);
33940d09
JE		 1592 if (dest_node_acl)
1593 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 1594 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1595
6708bb27 1596 if (!dest_node_acl) {
c66ac9db
NB		 1597 core_scsi3_tpg_undepend_item(tmp_tpg);
1598 spin_lock(&dev->se_port_lock);
1599 continue;
1600 }
1601
de103c93 1602 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1603 pr_err("configfs_depend_item() failed"
c66ac9db 1604 " for dest_node_acl->acl_group\n");
33940d09 1605 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 1606 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1607 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1608 goto out_unmap;
c66ac9db
NB		 1609 }
1610
1611 dest_tpg = tmp_tpg;
6708bb27 1612 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1613 " %s Port RTPI: %hu\n",
e3d6f909 1614 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1615 dest_node_acl->initiatorname, dest_rtpi);
1616
1617 spin_lock(&dev->se_port_lock);
1618 break;
1619 }
1620 spin_unlock(&dev->se_port_lock);
1621
6708bb27
AG		 1622 if (!dest_tpg) {
1623 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1624 " dest_tpg\n");
de103c93
CH		 1625 ret = TCM_INVALID_PARAMETER_LIST;
1626 goto out_unmap;
c66ac9db 1627 }
8b1e1244 1628
6708bb27 1629 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1630 " tid_len: %d for %s + %s\n",
e3d6f909 1631 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1632 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1633
c66ac9db 1634 if (tid_len > tpdl) {
6708bb27 1635 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1636 " %u for Transport ID: %s\n", tid_len, ptr);
1637 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1638 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1639 ret = TCM_INVALID_PARAMETER_LIST;
1640 goto out_unmap;
c66ac9db
NB		 1641 }
1642 /*
1643 * Locate the desintation struct se_dev_entry pointer for matching
1644 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1645 * Target Port.
1646 */
1647 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1648 dest_rtpi);
6708bb27
AG		 1649 if (!dest_se_deve) {
1650 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1651 " from destination RTPI: %hu\n",
e3d6f909 1652 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1653 dest_rtpi);
1654
1655 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1656 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1657 ret = TCM_INVALID_PARAMETER_LIST;
1658 goto out_unmap;
c66ac9db
NB		 1659 }
1660
de103c93 1661 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1662 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db 1663 " failed\n");
33940d09 1664 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db
NB		 1665 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1666 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1667 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1668 goto out_unmap;
c66ac9db 1669 }
8b1e1244 1670
6708bb27 1671 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1672 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1673 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1674 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1675
c66ac9db
NB		 1676 /*
1677 * Skip any TransportIDs that already have a registration for
1678 * this target port.
1679 */
1680 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1681 iport_ptr);
1682 if (pr_reg_e) {
1683 core_scsi3_put_pr_reg(pr_reg_e);
1684 core_scsi3_lunacl_undepend_item(dest_se_deve);
1685 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1686 core_scsi3_tpg_undepend_item(dest_tpg);
1687 ptr += tid_len;
1688 tpdl -= tid_len;
1689 tid_len = 0;
1690 continue;
1691 }
1692 /*
1693 * Allocate a struct pr_transport_id_holder and setup
1694 * the dest_node_acl and dest_se_deve pointers for the
1695 * loop below.
1696 */
1697 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1698 GFP_KERNEL);
6708bb27
AG		 1699 if (!tidh_new) {
1700 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1701 core_scsi3_lunacl_undepend_item(dest_se_deve);
1702 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1703 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1704 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1705 goto out_unmap;
c66ac9db
NB		 1706 }
1707 INIT_LIST_HEAD(&tidh_new->dest_list);
1708 tidh_new->dest_tpg = dest_tpg;
1709 tidh_new->dest_node_acl = dest_node_acl;
1710 tidh_new->dest_se_deve = dest_se_deve;
1711
1712 /*
1713 * Allocate, but do NOT add the registration for the
1714 * TransportID referenced SCSI Initiator port. This
1715 * done because of the following from spc4r17 in section
1716 * 6.14.3 wrt SPEC_I_PT:
1717 *
1718 * "If a registration fails for any initiator port (e.g., if th
1719 * logical unit does not have enough resources available to
1720 * hold the registration information), no registrations shall be
1721 * made, and the command shall be terminated with
1722 * CHECK CONDITION status."
1723 *
1724 * That means we call __core_scsi3_alloc_registration() here,
1725 * and then call __core_scsi3_add_registration() in the
1726 * 2nd loop which will never fail.
1727 */
5951146d 1728 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1729 dest_node_acl, dest_se_deve, iport_ptr,
1730 sa_res_key, all_tg_pt, aptpl);
6708bb27 1731 if (!dest_pr_reg) {
c66ac9db
NB		 1732 core_scsi3_lunacl_undepend_item(dest_se_deve);
1733 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1734 core_scsi3_tpg_undepend_item(dest_tpg);
1735 kfree(tidh_new);
de103c93
CH		 1736 ret = TCM_INVALID_PARAMETER_LIST;
1737 goto out_unmap;
c66ac9db
NB		 1738 }
1739 tidh_new->dest_pr_reg = dest_pr_reg;
1740 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1741
1742 ptr += tid_len;
1743 tpdl -= tid_len;
1744 tid_len = 0;
1745
1746 }
05d1c7c0 1747
4949314c 1748 transport_kunmap_data_sg(cmd);
05d1c7c0 1749
c66ac9db
NB		 1750 /*
1751 * Go ahead and create a registrations from tid_dest_list for the
1752 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1753 * and dest_se_deve.
1754 *
1755 * The SA Reservation Key from the PROUT is set for the
1756 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1757 * means that the TransportID Initiator port will be
1758 * registered on all of the target ports in the SCSI target device
1759 * ALL_TG_PT=0 means the registration will only be for the
1760 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1761 * was received.
1762 */
1763 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1764 dest_tpg = tidh->dest_tpg;
1765 dest_node_acl = tidh->dest_node_acl;
1766 dest_se_deve = tidh->dest_se_deve;
1767 dest_pr_reg = tidh->dest_pr_reg;
1768 dest_local_nexus = tidh->dest_local_nexus;
1769
1770 list_del(&tidh->dest_list);
1771 kfree(tidh);
1772
1773 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 1774 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 1775
5951146d 1776 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1777 dest_pr_reg, 0, 0);
1778
6708bb27 1779 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1780 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1781 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
d2843c17 1782 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
c66ac9db
NB		 1783
1784 if (dest_local_nexus)
1785 continue;
1786
1787 core_scsi3_lunacl_undepend_item(dest_se_deve);
1788 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1789 core_scsi3_tpg_undepend_item(dest_tpg);
1790 }
1791
1792 return 0;
de103c93 1793out_unmap:
4949314c 1794 transport_kunmap_data_sg(cmd);
de103c93 1795out:
c66ac9db
NB		 1796 /*
1797 * For the failure case, release everything from tid_dest_list
1798 * including *dest_pr_reg and the configfs dependances..
1799 */
1800 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1801 dest_tpg = tidh->dest_tpg;
1802 dest_node_acl = tidh->dest_node_acl;
1803 dest_se_deve = tidh->dest_se_deve;
1804 dest_pr_reg = tidh->dest_pr_reg;
1805 dest_local_nexus = tidh->dest_local_nexus;
1806
1807 list_del(&tidh->dest_list);
1808 kfree(tidh);
1809 /*
1810 * Release any extra ALL_TG_PT=1 registrations for
1811 * the SPEC_I_PT=1 case.
1812 */
1813 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1814 &dest_pr_reg->pr_reg_atp_list,
1815 pr_reg_atp_mem_list) {
1816 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1817 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1818 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1819 }
1820
c66ac9db
NB		 1821 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1822
1823 if (dest_local_nexus)
1824 continue;
1825
1826 core_scsi3_lunacl_undepend_item(dest_se_deve);
1827 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1828 core_scsi3_tpg_undepend_item(dest_tpg);
1829 }
1830 return ret;
1831}
1832
3c8a6228 1833static int core_scsi3_update_aptpl_buf(
c66ac9db
NB		 1834 struct se_device *dev,
1835 unsigned char *buf,
0607decd 1836 u32 pr_aptpl_buf_len)
c66ac9db
NB		 1837{
1838 struct se_lun *lun;
1839 struct se_portal_group *tpg;
c66ac9db
NB		 1840 struct t10_pr_registration *pr_reg;
1841 unsigned char tmp[512], isid_buf[32];
1842 ssize_t len = 0;
1843 int reg_count = 0;
3c8a6228 1844 int ret = 0;
c66ac9db 1845
3c8a6228
AG		 1846 spin_lock(&dev->dev_reservation_lock);
1847 spin_lock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1848 /*
1849 * Walk the registration list..
1850 */
0fd97ccf 1851 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1852 pr_reg_list) {
1853
1854 tmp[0] = '\0';
1855 isid_buf[0] = '\0';
1856 tpg = pr_reg->pr_reg_nacl->se_tpg;
1857 lun = pr_reg->pr_reg_tg_pt_lun;
1858 /*
1859 * Write out any ISID value to APTPL metadata that was included
1860 * in the original registration.
1861 */
1862 if (pr_reg->isid_present_at_reg)
1863 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1864 pr_reg->pr_reg_isid);
1865 /*
1866 * Include special metadata if the pr_reg matches the
1867 * reservation holder.
1868 */
1869 if (dev->dev_pr_res_holder == pr_reg) {
1870 snprintf(tmp, 512, "PR_REG_START: %d"
1871 "\ninitiator_fabric=%s\n"
1872 "initiator_node=%s\n%s"
1873 "sa_res_key=%llu\n"
1874 "res_holder=1\nres_type=%02x\n"
1875 "res_scope=%02x\nres_all_tg_pt=%d\n"
1876 "mapped_lun=%u\n", reg_count,
e3d6f909 1877 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1878 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1879 pr_reg->pr_res_key, pr_reg->pr_res_type,
1880 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1881 pr_reg->pr_res_mapped_lun);
1882 } else {
1883 snprintf(tmp, 512, "PR_REG_START: %d\n"
1884 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1885 "sa_res_key=%llu\nres_holder=0\n"
1886 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1887 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1888 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1889 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1890 pr_reg->pr_res_mapped_lun);
1891 }
1892
60d645a4 1893 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1894 pr_err("Unable to update renaming APTPL metadata,"
1895 " reallocating larger buffer\n");
3c8a6228
AG		 1896 ret = -EMSGSIZE;
1897 goto out;
c66ac9db
NB		 1898 }
1899 len += sprintf(buf+len, "%s", tmp);
1900
1901 /*
1902 * Include information about the associated SCSI target port.
1903 */
1904 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1905 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1906 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1907 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1908 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1909 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1910
60d645a4 1911 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
f161d4b4
NB		 1912 pr_err("Unable to update renaming APTPL metadata,"
1913 " reallocating larger buffer\n");
3c8a6228
AG		 1914 ret = -EMSGSIZE;
1915 goto out;
c66ac9db
NB		 1916 }
1917 len += sprintf(buf+len, "%s", tmp);
1918 reg_count++;
1919 }
c66ac9db 1920
6708bb27 1921 if (!reg_count)
c66ac9db
NB		 1922 len += sprintf(buf+len, "No Registrations or Reservations");
1923
3c8a6228
AG		 1924out:
1925 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 1926 spin_unlock(&dev->dev_reservation_lock);
1927
1928 return ret;
1929}
1930
c66ac9db
NB		 1931static int __core_scsi3_write_aptpl_to_file(
1932 struct se_device *dev,
4dee96fb 1933 unsigned char *buf)
c66ac9db 1934{
0fd97ccf 1935 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1936 struct file *file;
c66ac9db
NB		 1937 int flags = O_RDWR | O_CREAT | O_TRUNC;
1938 char path[512];
4dee96fb 1939 u32 pr_aptpl_buf_len;
c66ac9db
NB		 1940 int ret;
1941
c66ac9db
NB		 1942 memset(path, 0, 512);
1943
60d645a4 1944 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1945 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1946 " into path buffer\n");
e3d6f909 1947 return -EMSGSIZE;
c66ac9db
NB		 1948 }
1949
1950 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1951 file = filp_open(path, flags, 0600);
0e9b10a9 1952 if (IS_ERR(file)) {
6708bb27 1953 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1954 " failed\n", path);
0e9b10a9 1955 return PTR_ERR(file);
c66ac9db
NB		 1956 }
1957
4dee96fb 1958 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
c66ac9db 1959
0e9b10a9 1960 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1961
0e9b10a9 1962 if (ret < 0)
6708bb27 1963 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 1964 fput(file);
c66ac9db 1965
f730f915 1966 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 1967}
1968
459f213b
AG		 1969/*
1970 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1971 * write out the updated metadata to struct file for this SCSI device.
1972 */
8a391857 1973static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
c66ac9db 1974{
8a391857 1975 unsigned char *buf;
f161d4b4 1976 int rc, len = PR_APTPL_BUF_LEN;
de103c93 1977
459f213b
AG		 1978 if (!aptpl) {
1979 char *null_buf = "No Registrations or Reservations\n";
1980
8a391857 1981 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
459f213b
AG		 1982 dev->t10_pr.pr_aptpl_active = 0;
1983 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
459f213b 1984
8a391857
NB		 1985 if (rc)
1986 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459f213b 1987
8a391857
NB		 1988 return 0;
1989 }
f161d4b4
NB		 1990retry:
1991 buf = vzalloc(len);
8a391857
NB		 1992 if (!buf)
1993 return TCM_OUT_OF_RESOURCES;
1994
f161d4b4 1995 rc = core_scsi3_update_aptpl_buf(dev, buf, len);
8a391857 1996 if (rc < 0) {
f161d4b4
NB		 1997 vfree(buf);
1998 len *= 2;
1999 goto retry;
c66ac9db
NB		 2000 }
2001
8a391857
NB		 2002 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2003 if (rc != 0) {
2004 pr_err("SPC-3 PR: Could not update APTPL\n");
f161d4b4 2005 vfree(buf);
8a391857
NB		 2006 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2007 }
2008 dev->t10_pr.pr_aptpl_active = 1;
f161d4b4 2009 vfree(buf);
8a391857
NB		 2010 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2011 return 0;
c66ac9db
NB		 2012}
2013
de103c93
CH		 2014static sense_reason_t
2015core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bc118fe4 2016 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
c66ac9db 2017{
e3d6f909 2018 struct se_session *se_sess = cmd->se_sess;
5951146d 2019 struct se_device *dev = cmd->se_dev;
c66ac9db 2020 struct se_dev_entry *se_deve;
e3d6f909 2021 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2022 struct se_portal_group *se_tpg;
bc118fe4 2023 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
0fd97ccf 2024 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2025 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2026 sense_reason_t ret = TCM_NO_SENSE;
fc09149d 2027 int pr_holder = 0, type;
c66ac9db 2028
6708bb27
AG		 2029 if (!se_sess || !se_lun) {
2030 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2031 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2032 }
2033 se_tpg = se_sess->se_tpg;
f2083241 2034 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2035
e3d6f909 2036 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2037 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2038 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2039 PR_REG_ISID_LEN);
2040 isid_ptr = &isid_buf[0];
2041 }
2042 /*
2043 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2044 */
bc118fe4
AG		 2045 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2046 if (!pr_reg) {
c66ac9db 2047 if (res_key) {
6708bb27 2048 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2049 " for SA REGISTER, returning CONFLICT\n");
de103c93 2050 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2051 }
2052 /*
2053 * Do nothing but return GOOD status.
2054 */
6708bb27 2055 if (!sa_res_key)
03e98c9e 2056 return 0;
c66ac9db 2057
6708bb27 2058 if (!spec_i_pt) {
c66ac9db
NB		 2059 /*
2060 * Perform the Service Action REGISTER on the Initiator
2061 * Port Endpoint that the PRO was received from on the
2062 * Logical Unit of the SCSI device server.
2063 */
de103c93 2064 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2065 se_sess->se_node_acl, se_deve, isid_ptr,
2066 sa_res_key, all_tg_pt, aptpl,
33ce6a87 2067 register_type, 0)) {
6708bb27 2068 pr_err("Unable to allocate"
c66ac9db 2069 " struct t10_pr_registration\n");
de103c93 2070 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2071 }
2072 } else {
2073 /*
2074 * Register both the Initiator port that received
2075 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2076 * TransportID from Parameter list and loop through
2077 * fabric dependent parameter list while calling
2078 * logic from of core_scsi3_alloc_registration() for
2079 * each TransportID provided SCSI Initiator Port/Device
2080 */
2081 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2082 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2083 if (ret != 0)
2084 return ret;
2085 }
c66ac9db 2086
459f213b 2087 return core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93
CH		 2088 }
2089
bc118fe4
AG		 2090 /* ok, existing registration */
2091
2092 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2093 pr_err("SPC-3 PR REGISTER: Received"
2094 " res_key: 0x%016Lx does not match"
2095 " existing SA REGISTER res_key:"
2096 " 0x%016Lx\n", res_key,
2097 pr_reg->pr_res_key);
2098 ret = TCM_RESERVATION_CONFLICT;
2099 goto out;
de103c93
CH		 2100 }
2101
2102 if (spec_i_pt) {
1f070cc2
AG		 2103 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2104 " set on a registered nexus\n");
de103c93 2105 ret = TCM_INVALID_PARAMETER_LIST;
bc118fe4 2106 goto out;
de103c93
CH		 2107 }
2108
2109 /*
2110 * An existing ALL_TG_PT=1 registration being released
2111 * must also set ALL_TG_PT=1 in the incoming PROUT.
2112 */
1f070cc2
AG		 2113 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2114 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
de103c93
CH		 2115 " registration exists, but ALL_TG_PT=1 bit not"
2116 " present in received PROUT\n");
2117 ret = TCM_INVALID_CDB_FIELD;
bc118fe4 2118 goto out;
de103c93
CH		 2119 }
2120
de103c93 2121 /*
51d9c41d 2122 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
de103c93 2123 */
51d9c41d
AG		 2124 if (sa_res_key) {
2125 /*
2126 * Increment PRgeneration counter for struct se_device"
2127 * upon a successful REGISTER, see spc4r17 section 6.3.2
2128 * READ_KEYS service action.
2129 */
2130 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2131 pr_reg->pr_res_key = sa_res_key;
2132 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2133 " Key for %s to: 0x%016Lx PRgeneration:"
2134 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2135 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2136 pr_reg->pr_reg_nacl->initiatorname,
2137 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2138
2139 } else {
2140 /*
2141 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2142 */
6c3c9baa
NB		 2143 type = pr_reg->pr_res_type;
2144 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2145 pr_reg);
de103c93 2146 if (pr_holder < 0) {
de103c93 2147 ret = TCM_RESERVATION_CONFLICT;
bc118fe4 2148 goto out;
c66ac9db 2149 }
de103c93
CH		 2150
2151 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2152 /*
de103c93
CH		 2153 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2154 * and matching pr_res_key.
c66ac9db 2155 */
de103c93
CH		 2156 if (pr_reg->pr_reg_all_tg_pt) {
2157 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2158 &pr_tmpl->registration_list,
2159 pr_reg_list) {
2160
2161 if (!pr_reg_p->pr_reg_all_tg_pt)
2162 continue;
2163 if (pr_reg_p->pr_res_key != res_key)
2164 continue;
2165 if (pr_reg == pr_reg_p)
2166 continue;
2167 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2168 pr_reg_p->pr_reg_nacl->initiatorname))
2169 continue;
2170
2171 __core_scsi3_free_registration(dev,
2172 pr_reg_p, NULL, 0);
c66ac9db
NB		 2173 }
2174 }
de103c93 2175
c66ac9db 2176 /*
de103c93 2177 * Release the calling I_T Nexus registration now..
c66ac9db 2178 */
de103c93 2179 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
fc09149d 2180 pr_reg = NULL;
c66ac9db 2181
de103c93
CH		 2182 /*
2183 * From spc4r17, section 5.7.11.3 Unregistering
2184 *
2185 * If the persistent reservation is a registrants only
2186 * type, the device server shall establish a unit
2187 * attention condition for the initiator port associated
2188 * with every registered I_T nexus except for the I_T
2189 * nexus on which the PERSISTENT RESERVE OUT command was
2190 * received, with the additional sense code set to
2191 * RESERVATIONS RELEASED.
2192 */
2193 if (pr_holder &&
fc09149d
NB		 2194 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2195 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
de103c93
CH		 2196 list_for_each_entry(pr_reg_p,
2197 &pr_tmpl->registration_list,
2198 pr_reg_list) {
2199
2200 core_scsi3_ua_allocate(
2201 pr_reg_p->pr_reg_nacl,
2202 pr_reg_p->pr_res_mapped_lun,
2203 0x2A,
2204 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2205 }
de103c93 2206 }
c66ac9db 2207
51d9c41d 2208 spin_unlock(&pr_tmpl->registration_lock);
de103c93 2209 }
c66ac9db 2210
459f213b 2211 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
de103c93 2212
bc118fe4 2213out:
fc09149d
NB		 2214 if (pr_reg)
2215 core_scsi3_put_pr_reg(pr_reg);
de103c93 2216 return ret;
c66ac9db
NB		 2217}
2218
2219unsigned char *core_scsi3_pr_dump_type(int type)
2220{
2221 switch (type) {
2222 case PR_TYPE_WRITE_EXCLUSIVE:
2223 return "Write Exclusive Access";
2224 case PR_TYPE_EXCLUSIVE_ACCESS:
2225 return "Exclusive Access";
2226 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2227 return "Write Exclusive Access, Registrants Only";
2228 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2229 return "Exclusive Access, Registrants Only";
2230 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2231 return "Write Exclusive Access, All Registrants";
2232 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2233 return "Exclusive Access, All Registrants";
2234 default:
2235 break;
2236 }
2237
2238 return "Unknown SPC-3 PR Type";
2239}
2240
de103c93
CH		 2241static sense_reason_t
2242core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2243{
de103c93 2244 struct se_device *dev = cmd->se_dev;
e3d6f909 2245 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2246 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2247 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2248 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2249 char i_buf[PR_REG_ISID_ID_LEN];
de103c93 2250 sense_reason_t ret;
c66ac9db
NB		 2251
2252 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2253
6708bb27
AG		 2254 if (!se_sess || !se_lun) {
2255 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2256 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2257 }
c66ac9db
NB		 2258 /*
2259 * Locate the existing *pr_reg via struct se_node_acl pointers
2260 */
5951146d 2261 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2262 se_sess);
6708bb27
AG		 2263 if (!pr_reg) {
2264 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2265 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2266 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2267 }
2268 /*
2269 * From spc4r17 Section 5.7.9: Reserving:
2270 *
2271 * An application client creates a persistent reservation by issuing
2272 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2273 * a registered I_T nexus with the following parameters:
2274 * a) RESERVATION KEY set to the value of the reservation key that is
2275 * registered with the logical unit for the I_T nexus; and
2276 */
2277 if (res_key != pr_reg->pr_res_key) {
6708bb27 2278 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2279 " does not match existing SA REGISTER res_key:"
2280 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2281 ret = TCM_RESERVATION_CONFLICT;
2282 goto out_put_pr_reg;
c66ac9db
NB		 2283 }
2284 /*
2285 * From spc4r17 Section 5.7.9: Reserving:
2286 *
2287 * From above:
2288 * b) TYPE field and SCOPE field set to the persistent reservation
2289 * being created.
2290 *
2291 * Only one persistent reservation is allowed at a time per logical unit
2292 * and that persistent reservation has a scope of LU_SCOPE.
2293 */
2294 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2295 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2296 ret = TCM_INVALID_PARAMETER_LIST;
2297 goto out_put_pr_reg;
c66ac9db
NB		 2298 }
2299 /*
2300 * See if we have an existing PR reservation holder pointer at
2301 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2302 * *pr_res_holder.
2303 */
2304 spin_lock(&dev->dev_reservation_lock);
2305 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2306 if (pr_res_holder) {
c66ac9db
NB		 2307 /*
2308 * From spc4r17 Section 5.7.9: Reserving:
2309 *
2310 * If the device server receives a PERSISTENT RESERVE OUT
2311 * command from an I_T nexus other than a persistent reservation
2312 * holder (see 5.7.10) that attempts to create a persistent
2313 * reservation when a persistent reservation already exists for
2314 * the logical unit, then the command shall be completed with
2315 * RESERVATION CONFLICT status.
2316 */
e673dc92 2317 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2318 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2319 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2320 " [%s]: %s while reservation already held by"
2321 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2322 cmd->se_tfo->get_fabric_name(),
c66ac9db 2323 se_sess->se_node_acl->initiatorname,
e3d6f909 2324 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2325 pr_res_holder->pr_reg_nacl->initiatorname);
2326
2327 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2328 ret = TCM_RESERVATION_CONFLICT;
2329 goto out_put_pr_reg;
c66ac9db
NB		 2330 }
2331 /*
2332 * From spc4r17 Section 5.7.9: Reserving:
2333 *
2334 * If a persistent reservation holder attempts to modify the
2335 * type or scope of an existing persistent reservation, the
2336 * command shall be completed with RESERVATION CONFLICT status.
2337 */
2338 if ((pr_res_holder->pr_res_type != type) ||
2339 (pr_res_holder->pr_res_scope != scope)) {
2340 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2341 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2342 " [%s]: %s trying to change TYPE and/or SCOPE,"
2343 " while reservation already held by [%s]: %s,"
2344 " returning RESERVATION_CONFLICT\n",
e3d6f909 2345 cmd->se_tfo->get_fabric_name(),
c66ac9db 2346 se_sess->se_node_acl->initiatorname,
e3d6f909 2347 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2348 pr_res_holder->pr_reg_nacl->initiatorname);
2349
2350 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2351 ret = TCM_RESERVATION_CONFLICT;
2352 goto out_put_pr_reg;
c66ac9db
NB		 2353 }
2354 /*
2355 * From spc4r17 Section 5.7.9: Reserving:
2356 *
2357 * If the device server receives a PERSISTENT RESERVE OUT
2358 * command with RESERVE service action where the TYPE field and
2359 * the SCOPE field contain the same values as the existing type
2360 * and scope from a persistent reservation holder, it shall not
2361 * make any change to the existing persistent reservation and
2362 * shall completethe command with GOOD status.
2363 */
2364 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2365 ret = 0;
2366 goto out_put_pr_reg;
c66ac9db
NB		 2367 }
2368 /*
2369 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2370 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2371 */
2372 pr_reg->pr_res_scope = scope;
2373 pr_reg->pr_res_type = type;
2374 pr_reg->pr_res_holder = 1;
2375 dev->dev_pr_res_holder = pr_reg;
d2843c17 2376 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2377
6708bb27 2378 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2379 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2380 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2381 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2382 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2383 cmd->se_tfo->get_fabric_name(),
c66ac9db 2384 se_sess->se_node_acl->initiatorname,
d2843c17 2385 i_buf);
c66ac9db
NB		 2386 spin_unlock(&dev->dev_reservation_lock);
2387
459f213b
AG		 2388 if (pr_tmpl->pr_aptpl_active)
2389 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db 2390
de103c93
CH		 2391 ret = 0;
2392out_put_pr_reg:
c66ac9db 2393 core_scsi3_put_pr_reg(pr_reg);
de103c93 2394 return ret;
c66ac9db
NB		 2395}
2396
de103c93
CH		 2397static sense_reason_t
2398core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2399 u64 res_key)
c66ac9db 2400{
c66ac9db
NB		 2401 switch (type) {
2402 case PR_TYPE_WRITE_EXCLUSIVE:
2403 case PR_TYPE_EXCLUSIVE_ACCESS:
2404 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2405 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2406 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2407 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2408 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2409 default:
6708bb27 2410 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2411 " 0x%02x\n", type);
de103c93 2412 return TCM_INVALID_CDB_FIELD;
c66ac9db 2413 }
c66ac9db
NB		 2414}
2415
2416/*
2417 * Called with struct se_device->dev_reservation_lock held.
2418 */
2419static void __core_scsi3_complete_pro_release(
2420 struct se_device *dev,
2421 struct se_node_acl *se_nacl,
2422 struct t10_pr_registration *pr_reg,
6c3c9baa
NB		 2423 int explicit,
2424 int unreg)
c66ac9db 2425{
9ac8928e 2426 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
c66ac9db 2427 char i_buf[PR_REG_ISID_ID_LEN];
6c3c9baa 2428 int pr_res_type = 0, pr_res_scope = 0;
c66ac9db
NB		 2429
2430 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2431 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 2432 /*
2433 * Go ahead and release the current PR reservation holder.
6c3c9baa
NB		 2434 * If an All Registrants reservation is currently active and
2435 * a unregister operation is requested, replace the current
2436 * dev_pr_res_holder with another active registration.
2437 */
2438 if (dev->dev_pr_res_holder) {
2439 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2440 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2441 dev->dev_pr_res_holder->pr_res_type = 0;
2442 dev->dev_pr_res_holder->pr_res_scope = 0;
2443 dev->dev_pr_res_holder->pr_res_holder = 0;
2444 dev->dev_pr_res_holder = NULL;
2445 }
2446 if (!unreg)
2447 goto out;
c66ac9db 2448
6c3c9baa
NB		 2449 spin_lock(&dev->t10_pr.registration_lock);
2450 list_del_init(&pr_reg->pr_reg_list);
2451 /*
2452 * If the I_T nexus is a reservation holder, the persistent reservation
2453 * is of an all registrants type, and the I_T nexus is the last remaining
2454 * registered I_T nexus, then the device server shall also release the
2455 * persistent reservation.
2456 */
2457 if (!list_empty(&dev->t10_pr.registration_list) &&
2458 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2459 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2460 dev->dev_pr_res_holder =
2461 list_entry(dev->t10_pr.registration_list.next,
2462 struct t10_pr_registration, pr_reg_list);
2463 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2464 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2465 dev->dev_pr_res_holder->pr_res_holder = 1;
2466 }
2467 spin_unlock(&dev->t10_pr.registration_lock);
2468out:
2469 if (!dev->dev_pr_res_holder) {
2470 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2471 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2472 tfo->get_fabric_name(), (explicit) ? "explicit" :
2473 "implicit", core_scsi3_pr_dump_type(pr_res_type),
2474 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2475 }
6708bb27 2476 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db 2477 tfo->get_fabric_name(), se_nacl->initiatorname,
d2843c17 2478 i_buf);
c66ac9db
NB		 2479 /*
2480 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2481 */
2482 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2483}
2484
de103c93
CH		 2485static sense_reason_t
2486core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2487 u64 res_key)
c66ac9db
NB		 2488{
2489 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2490 struct se_session *se_sess = cmd->se_sess;
2491 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2492 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2493 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93 2494 sense_reason_t ret = 0;
c66ac9db 2495
6708bb27
AG		 2496 if (!se_sess || !se_lun) {
2497 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2498 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2499 }
2500 /*
2501 * Locate the existing *pr_reg via struct se_node_acl pointers
2502 */
2503 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2504 if (!pr_reg) {
2505 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2506 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2507 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2508 }
2509 /*
2510 * From spc4r17 Section 5.7.11.2 Releasing:
2511 *
2512 * If there is no persistent reservation or in response to a persistent
2513 * reservation release request from a registered I_T nexus that is not a
2514 * persistent reservation holder (see 5.7.10), the device server shall
2515 * do the following:
2516 *
2517 * a) Not release the persistent reservation, if any;
2518 * b) Not remove any registrations; and
2519 * c) Complete the command with GOOD status.
2520 */
2521 spin_lock(&dev->dev_reservation_lock);
2522 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2523 if (!pr_res_holder) {
c66ac9db
NB		 2524 /*
2525 * No persistent reservation, return GOOD status.
2526 */
2527 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2528 goto out_put_pr_reg;
c66ac9db 2529 }
c66ac9db 2530
e673dc92 2531 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
c66ac9db 2532 /*
c66ac9db
NB		 2533 * Release request from a registered I_T nexus that is not a
2534 * persistent reservation holder. return GOOD status.
2535 */
2536 spin_unlock(&dev->dev_reservation_lock);
de103c93 2537 goto out_put_pr_reg;
c66ac9db 2538 }
de103c93 2539
c66ac9db
NB		 2540 /*
2541 * From spc4r17 Section 5.7.11.2 Releasing:
2542 *
2543 * Only the persistent reservation holder (see 5.7.10) is allowed to
2544 * release a persistent reservation.
2545 *
2546 * An application client releases the persistent reservation by issuing
2547 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2548 * an I_T nexus that is a persistent reservation holder with the
2549 * following parameters:
2550 *
2551 * a) RESERVATION KEY field set to the value of the reservation key
2552 * that is registered with the logical unit for the I_T nexus;
2553 */
2554 if (res_key != pr_reg->pr_res_key) {
6708bb27 2555 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2556 " does not match existing SA REGISTER res_key:"
2557 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2558 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2559 ret = TCM_RESERVATION_CONFLICT;
2560 goto out_put_pr_reg;
c66ac9db
NB		 2561 }
2562 /*
2563 * From spc4r17 Section 5.7.11.2 Releasing and above:
2564 *
2565 * b) TYPE field and SCOPE field set to match the persistent
2566 * reservation being released.
2567 */
2568 if ((pr_res_holder->pr_res_type != type) ||
2569 (pr_res_holder->pr_res_scope != scope)) {
2570 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2571 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2572 " reservation from [%s]: %s with different TYPE "
2573 "and/or SCOPE while reservation already held by"
2574 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2575 cmd->se_tfo->get_fabric_name(),
c66ac9db 2576 se_sess->se_node_acl->initiatorname,
e3d6f909 2577 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2578 pr_res_holder->pr_reg_nacl->initiatorname);
2579
2580 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2581 ret = TCM_RESERVATION_CONFLICT;
2582 goto out_put_pr_reg;
c66ac9db
NB		 2583 }
2584 /*
2585 * In response to a persistent reservation release request from the
2586 * persistent reservation holder the device server shall perform a
2587 * release by doing the following as an uninterrupted series of actions:
2588 * a) Release the persistent reservation;
2589 * b) Not remove any registration(s);
2590 * c) If the released persistent reservation is a registrants only type
2591 * or all registrants type persistent reservation,
2592 * the device server shall establish a unit attention condition for
2593 * the initiator port associated with every regis-
2594 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2595 * RESERVE OUT command with RELEASE service action was received,
2596 * with the additional sense code set to RESERVATIONS RELEASED; and
2597 * d) If the persistent reservation is of any other type, the device
2598 * server shall not establish a unit attention condition.
2599 */
2600 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
6c3c9baa 2601 pr_reg, 1, 0);
c66ac9db
NB		 2602
2603 spin_unlock(&dev->dev_reservation_lock);
2604
2605 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2606 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2607 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2608 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2609 /*
2610 * If no UNIT ATTENTION conditions will be established for
2611 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2612 * go ahead and check for APTPL=1 update+write below
2613 */
2614 goto write_aptpl;
2615 }
2616
2617 spin_lock(&pr_tmpl->registration_lock);
2618 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2619 pr_reg_list) {
2620 /*
2621 * Do not establish a UNIT ATTENTION condition
2622 * for the calling I_T Nexus
2623 */
2624 if (pr_reg_p == pr_reg)
2625 continue;
2626
2627 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2628 pr_reg_p->pr_res_mapped_lun,
2629 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2630 }
2631 spin_unlock(&pr_tmpl->registration_lock);
2632
2633write_aptpl:
459f213b
AG		 2634 if (pr_tmpl->pr_aptpl_active)
2635 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2636
de103c93 2637out_put_pr_reg:
c66ac9db 2638 core_scsi3_put_pr_reg(pr_reg);
de103c93 2639 return ret;
c66ac9db
NB		 2640}
2641
de103c93
CH		 2642static sense_reason_t
2643core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2644{
2645 struct se_device *dev = cmd->se_dev;
2646 struct se_node_acl *pr_reg_nacl;
e3d6f909 2647 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2648 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2649 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2650 u32 pr_res_mapped_lun = 0;
2651 int calling_it_nexus = 0;
2652 /*
2653 * Locate the existing *pr_reg via struct se_node_acl pointers
2654 */
5951146d 2655 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2656 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2657 if (!pr_reg_n) {
2658 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2659 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2660 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2661 }
2662 /*
2663 * From spc4r17 section 5.7.11.6, Clearing:
2664 *
2665 * Any application client may release the persistent reservation and
2666 * remove all registrations from a device server by issuing a
2667 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2668 * registered I_T nexus with the following parameter:
2669 *
2670 * a) RESERVATION KEY field set to the value of the reservation key
2671 * that is registered with the logical unit for the I_T nexus.
2672 */
2673 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2674 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2675 " res_key: 0x%016Lx does not match"
2676 " existing SA REGISTER res_key:"
2677 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2678 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2679 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2680 }
2681 /*
2682 * a) Release the persistent reservation, if any;
2683 */
2684 spin_lock(&dev->dev_reservation_lock);
2685 pr_res_holder = dev->dev_pr_res_holder;
2686 if (pr_res_holder) {
2687 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2688 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 2689 pr_res_holder, 0, 0);
c66ac9db
NB		 2690 }
2691 spin_unlock(&dev->dev_reservation_lock);
2692 /*
2693 * b) Remove all registration(s) (see spc4r17 5.7.7);
2694 */
2695 spin_lock(&pr_tmpl->registration_lock);
2696 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2697 &pr_tmpl->registration_list, pr_reg_list) {
2698
2699 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2700 pr_reg_nacl = pr_reg->pr_reg_nacl;
2701 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2702 __core_scsi3_free_registration(dev, pr_reg, NULL,
2703 calling_it_nexus);
2704 /*
2705 * e) Establish a unit attention condition for the initiator
2706 * port associated with every registered I_T nexus other
2707 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2708 * command with CLEAR service action was received, with the
2709 * additional sense code set to RESERVATIONS PREEMPTED.
2710 */
6708bb27 2711 if (!calling_it_nexus)
c66ac9db
NB		 2712 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2713 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2714 }
2715 spin_unlock(&pr_tmpl->registration_lock);
2716
6708bb27 2717 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2718 cmd->se_tfo->get_fabric_name());
c66ac9db 2719
459f213b 2720 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
c66ac9db
NB		 2721
2722 core_scsi3_pr_generation(dev);
2723 return 0;
2724}
2725
2726/*
2727 * Called with struct se_device->dev_reservation_lock held.
2728 */
2729static void __core_scsi3_complete_pro_preempt(
2730 struct se_device *dev,
2731 struct t10_pr_registration *pr_reg,
2732 struct list_head *preempt_and_abort_list,
2733 int type,
2734 int scope,
33ce6a87 2735 enum preempt_type preempt_type)
c66ac9db
NB		 2736{
2737 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
9ac8928e 2738 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
c66ac9db 2739 char i_buf[PR_REG_ISID_ID_LEN];
c66ac9db
NB		 2740
2741 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
d2843c17 2742 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db 2743 /*
125d0119 2744 * Do an implicit RELEASE of the existing reservation.
c66ac9db
NB		 2745 */
2746 if (dev->dev_pr_res_holder)
2747 __core_scsi3_complete_pro_release(dev, nacl,
6c3c9baa 2748 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2749
2750 dev->dev_pr_res_holder = pr_reg;
2751 pr_reg->pr_res_holder = 1;
2752 pr_reg->pr_res_type = type;
2753 pr_reg->pr_res_scope = scope;
2754
6708bb27 2755 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db 2756 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
33ce6a87 2757 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
c66ac9db
NB		 2758 core_scsi3_pr_dump_type(type),
2759 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2760 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
33ce6a87 2761 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
d2843c17 2762 nacl->initiatorname, i_buf);
c66ac9db
NB		 2763 /*
2764 * For PREEMPT_AND_ABORT, add the preempting reservation's
2765 * struct t10_pr_registration to the list that will be compared
2766 * against received CDBs..
2767 */
2768 if (preempt_and_abort_list)
2769 list_add_tail(&pr_reg->pr_reg_abort_list,
2770 preempt_and_abort_list);
2771}
2772
2773static void core_scsi3_release_preempt_and_abort(
2774 struct list_head *preempt_and_abort_list,
2775 struct t10_pr_registration *pr_reg_holder)
2776{
2777 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2778
2779 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2780 pr_reg_abort_list) {
2781
2782 list_del(&pr_reg->pr_reg_abort_list);
2783 if (pr_reg_holder == pr_reg)
2784 continue;
2785 if (pr_reg->pr_res_holder) {
6708bb27 2786 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2787 continue;
2788 }
2789
2790 pr_reg->pr_reg_deve = NULL;
2791 pr_reg->pr_reg_nacl = NULL;
c66ac9db
NB		 2792 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2793 }
2794}
2795
de103c93
CH		 2796static sense_reason_t
2797core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
33ce6a87 2798 u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 2799{
5951146d 2800 struct se_device *dev = cmd->se_dev;
c66ac9db 2801 struct se_node_acl *pr_reg_nacl;
e3d6f909 2802 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2803 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2804 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2805 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2806 u32 pr_res_mapped_lun = 0;
b6932ee3
SA		 2807 int all_reg = 0, calling_it_nexus = 0;
2808 bool sa_res_key_unmatched = sa_res_key != 0;
de103c93 2809 int prh_type = 0, prh_scope = 0;
c66ac9db 2810
de103c93
CH		 2811 if (!se_sess)
2812 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2813
5951146d 2814 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2815 se_sess);
6708bb27
AG		 2816 if (!pr_reg_n) {
2817 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2818 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
33ce6a87 2819 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
de103c93 2820 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2821 }
2822 if (pr_reg_n->pr_res_key != res_key) {
2823 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2824 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2825 }
2826 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2827 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2828 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2829 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2830 }
c66ac9db
NB		 2831
2832 spin_lock(&dev->dev_reservation_lock);
2833 pr_res_holder = dev->dev_pr_res_holder;
2834 if (pr_res_holder &&
2835 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2836 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2837 all_reg = 1;
2838
6708bb27 2839 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2840 spin_unlock(&dev->dev_reservation_lock);
2841 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2842 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2843 }
2844 /*
2845 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2846 *
2847 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2848 * persistent reservation holder or there is no persistent reservation
2849 * holder (i.e., there is no persistent reservation), then the device
2850 * server shall perform a preempt by doing the following in an
2851 * uninterrupted series of actions. (See below..)
2852 */
6708bb27 2853 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2854 /*
2855 * No existing or SA Reservation Key matching reservations..
2856 *
2857 * PROUT SA PREEMPT with All Registrant type reservations are
2858 * allowed to be processed without a matching SA Reservation Key
2859 */
2860 spin_lock(&pr_tmpl->registration_lock);
2861 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2862 &pr_tmpl->registration_list, pr_reg_list) {
2863 /*
2864 * Removing of registrations in non all registrants
2865 * type reservations without a matching SA reservation
2866 * key.
2867 *
2868 * a) Remove the registrations for all I_T nexuses
2869 * specified by the SERVICE ACTION RESERVATION KEY
2870 * field;
2871 * b) Ignore the contents of the SCOPE and TYPE fields;
2872 * c) Process tasks as defined in 5.7.1; and
2873 * d) Establish a unit attention condition for the
2874 * initiator port associated with every I_T nexus
2875 * that lost its registration other than the I_T
2876 * nexus on which the PERSISTENT RESERVE OUT command
2877 * was received, with the additional sense code set
2878 * to REGISTRATIONS PREEMPTED.
2879 */
6708bb27 2880 if (!all_reg) {
c66ac9db
NB		 2881 if (pr_reg->pr_res_key != sa_res_key)
2882 continue;
b6932ee3 2883 sa_res_key_unmatched = false;
c66ac9db
NB		 2884
2885 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2886 pr_reg_nacl = pr_reg->pr_reg_nacl;
2887 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2888 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2889 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2890 NULL, calling_it_nexus);
c66ac9db
NB		 2891 } else {
2892 /*
2893 * Case for any existing all registrants type
2894 * reservation, follow logic in spc4r17 section
2895 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2896 *
2897 * For a ZERO SA Reservation key, release
125d0119 2898 * all other registrations and do an implicit
c66ac9db
NB		 2899 * release of active persistent reservation.
2900 *
2901 * For a non-ZERO SA Reservation key, only
2902 * release the matching reservation key from
2903 * registrations.
2904 */
2905 if ((sa_res_key) &&
2906 (pr_reg->pr_res_key != sa_res_key))
2907 continue;
b6932ee3 2908 sa_res_key_unmatched = false;
c66ac9db
NB		 2909
2910 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2911 if (calling_it_nexus)
2912 continue;
2913
2914 pr_reg_nacl = pr_reg->pr_reg_nacl;
2915 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2916 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 2917 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
c66ac9db 2918 NULL, 0);
c66ac9db 2919 }
6708bb27 2920 if (!calling_it_nexus)
c66ac9db
NB		 2921 core_scsi3_ua_allocate(pr_reg_nacl,
2922 pr_res_mapped_lun, 0x2A,
9e08e34e 2923 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 2924 }
2925 spin_unlock(&pr_tmpl->registration_lock);
2926 /*
2927 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2928 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2929 * RESERVATION KEY field to a value that does not match any
2930 * registered reservation key, then the device server shall
2931 * complete the command with RESERVATION CONFLICT status.
2932 */
b6932ee3 2933 if (sa_res_key_unmatched) {
c66ac9db
NB		 2934 spin_unlock(&dev->dev_reservation_lock);
2935 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2936 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2937 }
2938 /*
2939 * For an existing all registrants type reservation
2940 * with a zero SA rservation key, preempt the existing
2941 * reservation with the new PR type and scope.
2942 */
2943 if (pr_res_holder && all_reg && !(sa_res_key)) {
2944 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 2945 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2946 type, scope, preempt_type);
c66ac9db 2947
33ce6a87 2948 if (preempt_type == PREEMPT_AND_ABORT)
c66ac9db
NB		 2949 core_scsi3_release_preempt_and_abort(
2950 &preempt_and_abort_list, pr_reg_n);
2951 }
2952 spin_unlock(&dev->dev_reservation_lock);
2953
459f213b
AG		 2954 if (pr_tmpl->pr_aptpl_active)
2955 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 2956
2957 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 2958 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 2959 return 0;
2960 }
2961 /*
2962 * The PREEMPTing SA reservation key matches that of the
2963 * existing persistent reservation, first, we check if
2964 * we are preempting our own reservation.
2965 * From spc4r17, section 5.7.11.4.3 Preempting
2966 * persistent reservations and registration handling
2967 *
2968 * If an all registrants persistent reservation is not
2969 * present, it is not an error for the persistent
2970 * reservation holder to preempt itself (i.e., a
2971 * PERSISTENT RESERVE OUT with a PREEMPT service action
2972 * or a PREEMPT AND ABORT service action with the
2973 * SERVICE ACTION RESERVATION KEY value equal to the
2974 * persistent reservation holder's reservation key that
2975 * is received from the persistent reservation holder).
2976 * In that case, the device server shall establish the
2977 * new persistent reservation and maintain the
2978 * registration.
2979 */
2980 prh_type = pr_res_holder->pr_res_type;
2981 prh_scope = pr_res_holder->pr_res_scope;
2982 /*
2983 * If the SERVICE ACTION RESERVATION KEY field identifies a
2984 * persistent reservation holder (see 5.7.10), the device
2985 * server shall perform a preempt by doing the following as
2986 * an uninterrupted series of actions:
2987 *
2988 * a) Release the persistent reservation for the holder
2989 * identified by the SERVICE ACTION RESERVATION KEY field;
2990 */
2991 if (pr_reg_n != pr_res_holder)
2992 __core_scsi3_complete_pro_release(dev,
6c3c9baa
NB		 2993 pr_res_holder->pr_reg_nacl,
2994 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 2995 /*
2996 * b) Remove the registrations for all I_T nexuses identified
2997 * by the SERVICE ACTION RESERVATION KEY field, except the
2998 * I_T nexus that is being used for the PERSISTENT RESERVE
2999 * OUT command. If an all registrants persistent reservation
3000 * is present and the SERVICE ACTION RESERVATION KEY field
3001 * is set to zero, then all registrations shall be removed
3002 * except for that of the I_T nexus that is being used for
3003 * the PERSISTENT RESERVE OUT command;
3004 */
3005 spin_lock(&pr_tmpl->registration_lock);
3006 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3007 &pr_tmpl->registration_list, pr_reg_list) {
3008
3009 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3010 if (calling_it_nexus)
3011 continue;
3012
3013 if (pr_reg->pr_res_key != sa_res_key)
3014 continue;
3015
3016 pr_reg_nacl = pr_reg->pr_reg_nacl;
3017 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3018 __core_scsi3_free_registration(dev, pr_reg,
33ce6a87 3019 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
c66ac9db
NB		 3020 calling_it_nexus);
3021 /*
3022 * e) Establish a unit attention condition for the initiator
3023 * port associated with every I_T nexus that lost its
3024 * persistent reservation and/or registration, with the
3025 * additional sense code set to REGISTRATIONS PREEMPTED;
3026 */
3027 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3028 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3029 }
3030 spin_unlock(&pr_tmpl->registration_lock);
3031 /*
3032 * c) Establish a persistent reservation for the preempting
3033 * I_T nexus using the contents of the SCOPE and TYPE fields;
3034 */
3035 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
33ce6a87
AG		 3036 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3037 type, scope, preempt_type);
c66ac9db
NB		 3038 /*
3039 * d) Process tasks as defined in 5.7.1;
3040 * e) See above..
3041 * f) If the type or scope has changed, then for every I_T nexus
3042 * whose reservation key was not removed, except for the I_T
3043 * nexus on which the PERSISTENT RESERVE OUT command was
3044 * received, the device server shall establish a unit
3045 * attention condition for the initiator port associated with
3046 * that I_T nexus, with the additional sense code set to
3047 * RESERVATIONS RELEASED. If the type or scope have not
3048 * changed, then no unit attention condition(s) shall be
3049 * established for this reason.
3050 */
3051 if ((prh_type != type) || (prh_scope != scope)) {
3052 spin_lock(&pr_tmpl->registration_lock);
3053 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3054 &pr_tmpl->registration_list, pr_reg_list) {
3055
3056 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3057 if (calling_it_nexus)
3058 continue;
3059
3060 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3061 pr_reg->pr_res_mapped_lun, 0x2A,
3062 ASCQ_2AH_RESERVATIONS_RELEASED);
3063 }
3064 spin_unlock(&pr_tmpl->registration_lock);
3065 }
3066 spin_unlock(&dev->dev_reservation_lock);
3067 /*
3068 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3069 * All received CDBs for the matching existing reservation and
3070 * registrations undergo ABORT_TASK logic.
3071 *
3072 * From there, core_scsi3_release_preempt_and_abort() will
3073 * release every registration in the list (which have already
3074 * been removed from the primary pr_reg list), except the
3075 * new persistent reservation holder, the calling Initiator Port.
3076 */
33ce6a87 3077 if (preempt_type == PREEMPT_AND_ABORT) {
c66ac9db
NB		 3078 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3079 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3080 pr_reg_n);
3081 }
3082
459f213b
AG		 3083 if (pr_tmpl->pr_aptpl_active)
3084 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
c66ac9db
NB		 3085
3086 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3087 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3088 return 0;
3089}
3090
de103c93
CH		 3091static sense_reason_t
3092core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
33ce6a87 3093 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
c66ac9db 3094{
c66ac9db
NB		 3095 switch (type) {
3096 case PR_TYPE_WRITE_EXCLUSIVE:
3097 case PR_TYPE_EXCLUSIVE_ACCESS:
3098 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3099 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3100 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3101 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 3102 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
33ce6a87 3103 sa_res_key, preempt_type);
c66ac9db 3104 default:
6708bb27 3105 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
33ce6a87 3106 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
de103c93 3107 return TCM_INVALID_CDB_FIELD;
c66ac9db 3108 }
c66ac9db
NB		 3109}
3110
3111
de103c93
CH		 3112static sense_reason_t
3113core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3114 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3115{
e3d6f909 3116 struct se_session *se_sess = cmd->se_sess;
5951146d 3117 struct se_device *dev = cmd->se_dev;
28168905 3118 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3119 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3120 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3121 struct se_port *se_port;
3122 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
9ac8928e 3123 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
c66ac9db 3124 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3125 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3126 unsigned char *buf;
c66ac9db 3127 unsigned char *initiator_str;
13ba564c 3128 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
c66ac9db 3129 u32 tid_len, tmp_tid_len;
d2843c17 3130 int new_reg = 0, type, scope, matching_iname;
de103c93 3131 sense_reason_t ret;
c66ac9db
NB		 3132 unsigned short rtpi;
3133 unsigned char proto_ident;
3134
6708bb27
AG		 3135 if (!se_sess || !se_lun) {
3136 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3137 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3138 }
de103c93 3139
c66ac9db
NB		 3140 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3141 se_tpg = se_sess->se_tpg;
e3d6f909 3142 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3143 /*
3144 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3145 * Register behaviors for a REGISTER AND MOVE service action
3146 *
3147 * Locate the existing *pr_reg via struct se_node_acl pointers
3148 */
5951146d 3149 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3150 se_sess);
6708bb27
AG		 3151 if (!pr_reg) {
3152 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3153 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3154 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3155 }
3156 /*
3157 * The provided reservation key much match the existing reservation key
3158 * provided during this initiator's I_T nexus registration.
3159 */
3160 if (res_key != pr_reg->pr_res_key) {
6708bb27 3161 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3162 " res_key: 0x%016Lx does not match existing SA REGISTER"
3163 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3164 ret = TCM_RESERVATION_CONFLICT;
3165 goto out_put_pr_reg;
c66ac9db
NB		 3166 }
3167 /*
3168 * The service active reservation key needs to be non zero
3169 */
6708bb27
AG		 3170 if (!sa_res_key) {
3171 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3172 " sa_res_key\n");
de103c93
CH		 3173 ret = TCM_INVALID_PARAMETER_LIST;
3174 goto out_put_pr_reg;
c66ac9db 3175 }
05d1c7c0 3176
c66ac9db
NB		 3177 /*
3178 * Determine the Relative Target Port Identifier where the reservation
3179 * will be moved to for the TransportID containing SCSI initiator WWN
3180 * information.
3181 */
4949314c 3182 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3183 if (!buf) {
3184 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3185 goto out_put_pr_reg;
3186 }
3187
c66ac9db
NB		 3188 rtpi = (buf[18] & 0xff) << 8;
3189 rtpi |= buf[19] & 0xff;
3190 tid_len = (buf[20] & 0xff) << 24;
3191 tid_len |= (buf[21] & 0xff) << 16;
3192 tid_len |= (buf[22] & 0xff) << 8;
3193 tid_len |= buf[23] & 0xff;
4949314c 3194 transport_kunmap_data_sg(cmd);
05d1c7c0 3195 buf = NULL;
c66ac9db
NB		 3196
3197 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3198 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3199 " does not equal CDB data_length: %u\n", tid_len,
3200 cmd->data_length);
de103c93
CH		 3201 ret = TCM_INVALID_PARAMETER_LIST;
3202 goto out_put_pr_reg;
c66ac9db
NB		 3203 }
3204
3205 spin_lock(&dev->se_port_lock);
3206 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3207 if (se_port->sep_rtpi != rtpi)
3208 continue;
3209 dest_se_tpg = se_port->sep_tpg;
6708bb27 3210 if (!dest_se_tpg)
c66ac9db 3211 continue;
e3d6f909 3212 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3213 if (!dest_tf_ops)
c66ac9db
NB		 3214 continue;
3215
33940d09 3216 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
c66ac9db
NB		 3217 spin_unlock(&dev->se_port_lock);
3218
de103c93 3219 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3220 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db 3221 " for dest_se_tpg\n");
33940d09 3222 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
de103c93
CH		 3223 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3224 goto out_put_pr_reg;
c66ac9db
NB		 3225 }
3226
3227 spin_lock(&dev->se_port_lock);
3228 break;
3229 }
3230 spin_unlock(&dev->se_port_lock);
3231
6708bb27
AG		 3232 if (!dest_se_tpg || !dest_tf_ops) {
3233 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3234 " fabric ops from Relative Target Port Identifier:"
3235 " %hu\n", rtpi);
de103c93
CH		 3236 ret = TCM_INVALID_PARAMETER_LIST;
3237 goto out_put_pr_reg;
c66ac9db 3238 }
05d1c7c0 3239
4949314c 3240 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3241 if (!buf) {
3242 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3243 goto out_put_pr_reg;
3244 }
c66ac9db 3245 proto_ident = (buf[24] & 0x0f);
8b1e1244 3246
6708bb27 3247 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3248 " 0x%02x\n", proto_ident);
8b1e1244 3249
c66ac9db 3250 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3251 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3252 " proto_ident: 0x%02x does not match ident: 0x%02x"
3253 " from fabric: %s\n", proto_ident,
3254 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3255 dest_tf_ops->get_fabric_name());
de103c93 3256 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3257 goto out;
3258 }
3259 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3261 " containg a valid tpg_parse_pr_out_transport_id"
3262 " function pointer\n");
de103c93 3263 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3264 goto out;
3265 }
3266 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3267 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3268 if (!initiator_str) {
3269 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3270 " initiator_str from Transport ID\n");
de103c93 3271 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3272 goto out;
3273 }
3274
4949314c 3275 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3276 buf = NULL;
3277
6708bb27 3278 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3279 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3280 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3281 iport_ptr : "");
3282 /*
3283 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3284 * action specifies a TransportID that is the same as the initiator port
3285 * of the I_T nexus for the command received, then the command shall
3286 * be terminated with CHECK CONDITION status, with the sense key set to
3287 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3288 * IN PARAMETER LIST.
3289 */
3290 pr_reg_nacl = pr_reg->pr_reg_nacl;
3291 matching_iname = (!strcmp(initiator_str,
3292 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3293 if (!matching_iname)
c66ac9db
NB		 3294 goto after_iport_check;
3295
6708bb27
AG		 3296 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3297 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3298 " matches: %s on received I_T Nexus\n", initiator_str,
3299 pr_reg_nacl->initiatorname);
de103c93 3300 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3301 goto out;
3302 }
6708bb27
AG		 3303 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3304 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3305 " matches: %s %s on received I_T Nexus\n",
3306 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3307 pr_reg->pr_reg_isid);
de103c93 3308 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3309 goto out;
3310 }
3311after_iport_check:
3312 /*
3313 * Locate the destination struct se_node_acl from the received Transport ID
3314 */
28638887 3315 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3316 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3317 initiator_str);
33940d09
JE		 3318 if (dest_node_acl)
3319 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
28638887 3320 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3321
6708bb27
AG		 3322 if (!dest_node_acl) {
3323 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3324 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3325 initiator_str);
de103c93 3326 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3327 goto out;
3328 }
de103c93
CH		 3329
3330 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3331 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db 3332 " dest_node_acl\n");
33940d09 3333 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
c66ac9db 3334 dest_node_acl = NULL;
de103c93 3335 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3336 goto out;
3337 }
8b1e1244 3338
6708bb27 3339 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3340 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3341 dest_node_acl->initiatorname);
8b1e1244 3342
c66ac9db
NB		 3343 /*
3344 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3345 * PORT IDENTIFIER.
3346 */
3347 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3348 if (!dest_se_deve) {
3349 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3350 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3351 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3352 goto out;
3353 }
3354
de103c93 3355 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3356 pr_err("core_scsi3_lunacl_depend_item() failed\n");
33940d09 3357 atomic_dec_mb(&dest_se_deve->pr_ref_count);
c66ac9db 3358 dest_se_deve = NULL;
de103c93 3359 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3360 goto out;
3361 }
8b1e1244 3362
6708bb27 3363 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3364 " ACL for dest_se_deve->mapped_lun: %u\n",
3365 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3366 dest_se_deve->mapped_lun);
8b1e1244 3367
c66ac9db
NB		 3368 /*
3369 * A persistent reservation needs to already existing in order to
3370 * successfully complete the REGISTER_AND_MOVE service action..
3371 */
3372 spin_lock(&dev->dev_reservation_lock);
3373 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3374 if (!pr_res_holder) {
3375 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3376 " currently held\n");
3377 spin_unlock(&dev->dev_reservation_lock);
de103c93 3378 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3379 goto out;
3380 }
3381 /*
3382 * The received on I_T Nexus must be the reservation holder.
3383 *
3384 * From spc4r17 section 5.7.8 Table 50 --
3385 * Register behaviors for a REGISTER AND MOVE service action
3386 */
e673dc92 3387 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
6708bb27 3388 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3389 " Nexus is not reservation holder\n");
3390 spin_unlock(&dev->dev_reservation_lock);
de103c93 3391 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3392 goto out;
3393 }
3394 /*
3395 * From spc4r17 section 5.7.8: registering and moving reservation
3396 *
3397 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3398 * action is received and the established persistent reservation is a
3399 * Write Exclusive - All Registrants type or Exclusive Access -
3400 * All Registrants type reservation, then the command shall be completed
3401 * with RESERVATION CONFLICT status.
3402 */
3403 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3404 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3405 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3406 " reservation for type: %s\n",
3407 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3408 spin_unlock(&dev->dev_reservation_lock);
de103c93 3409 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3410 goto out;
3411 }
3412 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3413 /*
3414 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3415 */
3416 type = pr_res_holder->pr_res_type;
3417 scope = pr_res_holder->pr_res_type;
3418 /*
3419 * c) Associate the reservation key specified in the SERVICE ACTION
3420 * RESERVATION KEY field with the I_T nexus specified as the
3421 * destination of the register and move, where:
3422 * A) The I_T nexus is specified by the TransportID and the
3423 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3424 * B) Regardless of the TransportID format used, the association for
3425 * the initiator port is based on either the initiator port name
3426 * (see 3.1.71) on SCSI transport protocols where port names are
3427 * required or the initiator port identifier (see 3.1.70) on SCSI
3428 * transport protocols where port names are not required;
3429 * d) Register the reservation key specified in the SERVICE ACTION
3430 * RESERVATION KEY field;
3431 * e) Retain the reservation key specified in the SERVICE ACTION
3432 * RESERVATION KEY field and associated information;
3433 *
3434 * Also, It is not an error for a REGISTER AND MOVE service action to
3435 * register an I_T nexus that is already registered with the same
3436 * reservation key or a different reservation key.
3437 */
3438 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3439 iport_ptr);
6708bb27 3440 if (!dest_pr_reg) {
de103c93 3441 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3442 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3443 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3444 spin_unlock(&dev->dev_reservation_lock);
de103c93 3445 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3446 goto out;
3447 }
3448 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3449 iport_ptr);
3450 new_reg = 1;
3451 }
3452 /*
3453 * f) Release the persistent reservation for the persistent reservation
3454 * holder (i.e., the I_T nexus on which the
3455 */
3456 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
6c3c9baa 3457 dev->dev_pr_res_holder, 0, 0);
c66ac9db
NB		 3458 /*
3459 * g) Move the persistent reservation to the specified I_T nexus using
3460 * the same scope and type as the persistent reservation released in
3461 * item f); and
3462 */
3463 dev->dev_pr_res_holder = dest_pr_reg;
3464 dest_pr_reg->pr_res_holder = 1;
3465 dest_pr_reg->pr_res_type = type;
3466 pr_reg->pr_res_scope = scope;
d2843c17 3467 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
c66ac9db
NB		 3468 /*
3469 * Increment PRGeneration for existing registrations..
3470 */
6708bb27 3471 if (!new_reg)
c66ac9db
NB		 3472 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3473 spin_unlock(&dev->dev_reservation_lock);
3474
6708bb27 3475 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3476 " created new reservation holder TYPE: %s on object RTPI:"
3477 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3478 core_scsi3_pr_dump_type(type), rtpi,
3479 dest_pr_reg->pr_res_generation);
6708bb27 3480 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3481 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3482 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
d2843c17 3483 i_buf, dest_tf_ops->get_fabric_name(),
c66ac9db
NB		 3484 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3485 iport_ptr : "");
3486 /*
3487 * It is now safe to release configfs group dependencies for destination
3488 * of Transport ID Initiator Device/Port Identifier
3489 */
3490 core_scsi3_lunacl_undepend_item(dest_se_deve);
3491 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3492 core_scsi3_tpg_undepend_item(dest_se_tpg);
3493 /*
3494 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3495 * nexus on which PERSISTENT RESERVE OUT command was received.
3496 */
3497 if (unreg) {
3498 spin_lock(&pr_tmpl->registration_lock);
3499 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3500 spin_unlock(&pr_tmpl->registration_lock);
3501 } else
3502 core_scsi3_put_pr_reg(pr_reg);
3503
459f213b 3504 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
c66ac9db 3505
4949314c 3506 transport_kunmap_data_sg(cmd);
05d1c7c0 3507
c66ac9db
NB		 3508 core_scsi3_put_pr_reg(dest_pr_reg);
3509 return 0;
3510out:
05d1c7c0 3511 if (buf)
4949314c 3512 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3513 if (dest_se_deve)
3514 core_scsi3_lunacl_undepend_item(dest_se_deve);
3515 if (dest_node_acl)
3516 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3517 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3518
3519out_put_pr_reg:
c66ac9db
NB		 3520 core_scsi3_put_pr_reg(pr_reg);
3521 return ret;
3522}
3523
3524static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3525{
3526 unsigned int __v1, __v2;
3527
3528 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3529 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3530
3531 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3532}
3533
3534/*
3535 * See spc4r17 section 6.14 Table 170
3536 */
de103c93
CH		 3537sense_reason_t
3538target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3539{
92404e60 3540 struct se_device *dev = cmd->se_dev;
617c0e06 3541 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3542 unsigned char *buf;
c66ac9db
NB		 3543 u64 res_key, sa_res_key;
3544 int sa, scope, type, aptpl;
3545 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3546 sense_reason_t ret;
617c0e06
CH		 3547
3548 /*
3549 * Following spc2r20 5.5.1 Reservations overview:
3550 *
3551 * If a logical unit has been reserved by any RESERVE command and is
3552 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3553 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3554 * initiator or service action and shall terminate with a RESERVATION
3555 * CONFLICT status.
3556 */
0fd97ccf 3557 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3558 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3559 " SPC-2 reservation is held, returning"
3560 " RESERVATION_CONFLICT\n");
de103c93 3561 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3562 }
3563
c66ac9db
NB		 3564 /*
3565 * FIXME: A NULL struct se_session pointer means an this is not coming from
3566 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3567 */
de103c93
CH		 3568 if (!cmd->se_sess)
3569 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3570
3571 if (cmd->data_length < 24) {
6708bb27 3572 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3573 " length too small: %u\n", cmd->data_length);
de103c93 3574 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3575 }
de103c93 3576
c66ac9db
NB		 3577 /*
3578 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3579 */
3580 sa = (cdb[1] & 0x1f);
3581 scope = (cdb[2] & 0xf0);
3582 type = (cdb[2] & 0x0f);
05d1c7c0 3583
4949314c 3584 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3585 if (!buf)
3586 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3587
c66ac9db
NB		 3588 /*
3589 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3590 */
3591 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3592 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3593 /*
3594 * REGISTER_AND_MOVE uses a different SA parameter list containing
3595 * SCSI TransportIDs.
3596 */
3597 if (sa != PRO_REGISTER_AND_MOVE) {
3598 spec_i_pt = (buf[20] & 0x08);
3599 all_tg_pt = (buf[20] & 0x04);
3600 aptpl = (buf[20] & 0x01);
3601 } else {
3602 aptpl = (buf[17] & 0x01);
3603 unreg = (buf[17] & 0x02);
3604 }
92404e60
NB		 3605 /*
3606 * If the backend device has been configured to force APTPL metadata
3607 * write-out, go ahead and propigate aptpl=1 down now.
3608 */
3609 if (dev->dev_attrib.force_pr_aptpl)
3610 aptpl = 1;
3611
4949314c 3612 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3613 buf = NULL;
3614
c66ac9db
NB		 3615 /*
3616 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3617 */
de103c93
CH		 3618 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3619 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3620
c66ac9db
NB		 3621 /*
3622 * From spc4r17 section 6.14:
3623 *
3624 * If the SPEC_I_PT bit is set to zero, the service action is not
3625 * REGISTER AND MOVE, and the parameter list length is not 24, then
3626 * the command shall be terminated with CHECK CONDITION status, with
3627 * the sense key set to ILLEGAL REQUEST, and the additional sense
3628 * code set to PARAMETER LIST LENGTH ERROR.
3629 */
6708bb27 3630 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3631 (cmd->data_length != 24)) {
6708bb27 3632 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3633 " list length: %u\n", cmd->data_length);
de103c93 3634 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3635 }
de103c93 3636
c66ac9db
NB		 3637 /*
3638 * (core_scsi3_emulate_pro_* function parameters
3639 * are defined by spc4r17 Table 174:
3640 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3641 */
3642 switch (sa) {
3643 case PRO_REGISTER:
d29a5b6a 3644 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3645 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
d29a5b6a 3646 break;
c66ac9db 3647 case PRO_RESERVE:
d29a5b6a
CH		 3648 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3649 break;
c66ac9db 3650 case PRO_RELEASE:
d29a5b6a
CH		 3651 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3652 break;
c66ac9db 3653 case PRO_CLEAR:
d29a5b6a
CH		 3654 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3655 break;
c66ac9db 3656 case PRO_PREEMPT:
d29a5b6a 3657 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3658 res_key, sa_res_key, PREEMPT);
d29a5b6a 3659 break;
c66ac9db 3660 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3661 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
33ce6a87 3662 res_key, sa_res_key, PREEMPT_AND_ABORT);
d29a5b6a 3663 break;
c66ac9db 3664 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3665 ret = core_scsi3_emulate_pro_register(cmd,
33ce6a87 3666 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
d29a5b6a 3667 break;
c66ac9db 3668 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3669 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3670 sa_res_key, aptpl, unreg);
d29a5b6a 3671 break;
c66ac9db 3672 default:
6708bb27 3673 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3674 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3675 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3676 }
3677
6bb35e00
CH		 3678 if (!ret)
3679 target_complete_cmd(cmd, GOOD);
d29a5b6a 3680 return ret;
c66ac9db
NB		 3681}
3682
3683/*
3684 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3685 *
3686 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3687 */
de103c93
CH		 3688static sense_reason_t
3689core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3690{
0fd97ccf 3691 struct se_device *dev = cmd->se_dev;
c66ac9db 3692 struct t10_pr_registration *pr_reg;
05d1c7c0 3693 unsigned char *buf;
c66ac9db
NB		 3694 u32 add_len = 0, off = 8;
3695
3696 if (cmd->data_length < 8) {
6708bb27 3697 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3698 " too small\n", cmd->data_length);
de103c93 3699 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3700 }
3701
4949314c 3702 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3703 if (!buf)
3704 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3705
0fd97ccf
CH		 3706 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3707 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3708 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3709 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3710
0fd97ccf
CH		 3711 spin_lock(&dev->t10_pr.registration_lock);
3712 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3713 pr_reg_list) {
3714 /*
3715 * Check for overflow of 8byte PRI READ_KEYS payload and
3716 * next reservation key list descriptor.
3717 */
3718 if ((add_len + 8) > (cmd->data_length - 8))
3719 break;
3720
3721 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3722 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3723 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3724 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3725 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3726 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3727 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3728 buf[off++] = (pr_reg->pr_res_key & 0xff);
3729
3730 add_len += 8;
3731 }
0fd97ccf 3732 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3733
3734 buf[4] = ((add_len >> 24) & 0xff);
3735 buf[5] = ((add_len >> 16) & 0xff);
3736 buf[6] = ((add_len >> 8) & 0xff);
3737 buf[7] = (add_len & 0xff);
3738
4949314c 3739 transport_kunmap_data_sg(cmd);
05d1c7c0 3740
c66ac9db
NB		 3741 return 0;
3742}
3743
3744/*
3745 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3746 *
3747 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3748 */
de103c93
CH		 3749static sense_reason_t
3750core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3751{
0fd97ccf 3752 struct se_device *dev = cmd->se_dev;
c66ac9db 3753 struct t10_pr_registration *pr_reg;
05d1c7c0 3754 unsigned char *buf;
c66ac9db
NB		 3755 u64 pr_res_key;
3756 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3757
3758 if (cmd->data_length < 8) {
6708bb27 3759 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3760 " too small\n", cmd->data_length);
de103c93 3761 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3762 }
3763
4949314c 3764 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3765 if (!buf)
3766 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3767
0fd97ccf
CH		 3768 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3769 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3770 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3771 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3772
0fd97ccf
CH		 3773 spin_lock(&dev->dev_reservation_lock);
3774 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3775 if (pr_reg) {
c66ac9db
NB		 3776 /*
3777 * Set the hardcoded Additional Length
3778 */
3779 buf[4] = ((add_len >> 24) & 0xff);
3780 buf[5] = ((add_len >> 16) & 0xff);
3781 buf[6] = ((add_len >> 8) & 0xff);
3782 buf[7] = (add_len & 0xff);
3783
05d1c7c0
AG		 3784 if (cmd->data_length < 22)
3785 goto err;
3786
c66ac9db
NB		 3787 /*
3788 * Set the Reservation key.
3789 *
3790 * From spc4r17, section 5.7.10:
3791 * A persistent reservation holder has its reservation key
3792 * returned in the parameter data from a PERSISTENT
3793 * RESERVE IN command with READ RESERVATION service action as
3794 * follows:
3795 * a) For a persistent reservation of the type Write Exclusive
3796 * - All Registrants or Exclusive Access ­ All Regitrants,
3797 * the reservation key shall be set to zero; or
3798 * b) For all other persistent reservation types, the
3799 * reservation key shall be set to the registered
3800 * reservation key for the I_T nexus that holds the
3801 * persistent reservation.
3802 */
3803 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3804 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3805 pr_res_key = 0;
3806 else
3807 pr_res_key = pr_reg->pr_res_key;
3808
3809 buf[8] = ((pr_res_key >> 56) & 0xff);
3810 buf[9] = ((pr_res_key >> 48) & 0xff);
3811 buf[10] = ((pr_res_key >> 40) & 0xff);
3812 buf[11] = ((pr_res_key >> 32) & 0xff);
3813 buf[12] = ((pr_res_key >> 24) & 0xff);
3814 buf[13] = ((pr_res_key >> 16) & 0xff);
3815 buf[14] = ((pr_res_key >> 8) & 0xff);
3816 buf[15] = (pr_res_key & 0xff);
3817 /*
3818 * Set the SCOPE and TYPE
3819 */
3820 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3821 (pr_reg->pr_res_type & 0x0f);
3822 }
05d1c7c0
AG		 3823
3824err:
0fd97ccf 3825 spin_unlock(&dev->dev_reservation_lock);
4949314c 3826 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3827
3828 return 0;
3829}
3830
3831/*
3832 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3833 *
3834 * See spc4r17 section 6.13.4 Table 165
3835 */
de103c93
CH		 3836static sense_reason_t
3837core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3838{
5951146d 3839 struct se_device *dev = cmd->se_dev;
0fd97ccf 3840 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3841 unsigned char *buf;
c66ac9db
NB		 3842 u16 add_len = 8; /* Hardcoded to 8. */
3843
3844 if (cmd->data_length < 6) {
6708bb27 3845 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3846 " %u too small\n", cmd->data_length);
de103c93 3847 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3848 }
3849
4949314c 3850 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3851 if (!buf)
3852 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3853
c435285d 3854 buf[0] = ((add_len >> 8) & 0xff);
c66ac9db
NB		 3855 buf[1] = (add_len & 0xff);
3856 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3857 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3858 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3859 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3860 /*
3861 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3862 * set the TMV: Task Mask Valid bit.
3863 */
3864 buf[3] |= 0x80;
3865 /*
3866 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3867 */
3868 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3869 /*
3870 * PTPL_A: Persistence across Target Power Loss Active bit
3871 */
3872 if (pr_tmpl->pr_aptpl_active)
3873 buf[3] |= 0x01;
3874 /*
3875 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3876 */
3877 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3878 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3879 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3880 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3881 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3882 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3883
4949314c 3884 transport_kunmap_data_sg(cmd);
05d1c7c0 3885
c66ac9db
NB		 3886 return 0;
3887}
3888
3889/*
3890 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3891 *
3892 * See spc4r17 section 6.13.5 Table 168 and 169
3893 */
de103c93
CH		 3894static sense_reason_t
3895core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 3896{
0fd97ccf 3897 struct se_device *dev = cmd->se_dev;
c66ac9db 3898 struct se_node_acl *se_nacl;
c66ac9db
NB		 3899 struct se_portal_group *se_tpg;
3900 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 3901 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3902 unsigned char *buf;
c66ac9db
NB		 3903 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3904 u32 off = 8; /* off into first Full Status descriptor */
d16ca7c5
NB		 3905 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3906 bool all_reg = false;
c66ac9db
NB		 3907
3908 if (cmd->data_length < 8) {
6708bb27 3909 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 3910 " too small\n", cmd->data_length);
de103c93 3911 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3912 }
3913
4949314c 3914 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3915 if (!buf)
3916 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3917
0fd97ccf
CH		 3918 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3919 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3920 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3921 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3922
d16ca7c5
NB		 3923 spin_lock(&dev->dev_reservation_lock);
3924 if (dev->dev_pr_res_holder) {
3925 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3926
3927 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3928 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3929 all_reg = true;
3930 pr_res_type = pr_holder->pr_res_type;
3931 pr_res_scope = pr_holder->pr_res_scope;
3932 }
3933 }
3934 spin_unlock(&dev->dev_reservation_lock);
3935
c66ac9db
NB		 3936 spin_lock(&pr_tmpl->registration_lock);
3937 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3938 &pr_tmpl->registration_list, pr_reg_list) {
3939
3940 se_nacl = pr_reg->pr_reg_nacl;
3941 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3942 add_desc_len = 0;
3943
33940d09 3944 atomic_inc_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3945 spin_unlock(&pr_tmpl->registration_lock);
3946 /*
3947 * Determine expected length of $FABRIC_MOD specific
3948 * TransportID full status descriptor..
3949 */
e3d6f909 3950 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 3951 se_tpg, se_nacl, pr_reg, &format_code);
3952
3953 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 3954 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 3955 " out of buffer: %d\n", cmd->data_length);
3956 spin_lock(&pr_tmpl->registration_lock);
33940d09 3957 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 3958 break;
3959 }
3960 /*
3961 * Set RESERVATION KEY
3962 */
3963 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3964 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3965 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3966 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3967 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3968 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3969 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3970 buf[off++] = (pr_reg->pr_res_key & 0xff);
3971 off += 4; /* Skip Over Reserved area */
3972
3973 /*
3974 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3975 */
3976 if (pr_reg->pr_reg_all_tg_pt)
3977 buf[off] = 0x02;
3978 /*
3979 * The struct se_lun pointer will be present for the
3980 * reservation holder for PR_HOLDER bit.
3981 *
3982 * Also, if this registration is the reservation
d16ca7c5
NB		 3983 * holder or there is an All Registrants reservation
3984 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 3985 */
3986 if (pr_reg->pr_res_holder) {
3987 buf[off++] |= 0x01;
3988 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3989 (pr_reg->pr_res_type & 0x0f);
d16ca7c5
NB		 3990 } else if (all_reg) {
3991 buf[off++] |= 0x01;
3992 buf[off++] = (pr_res_scope & 0xf0) |
3993 (pr_res_type & 0x0f);
3994 } else {
c66ac9db 3995 off += 2;
d16ca7c5 3996 }
c66ac9db
NB		 3997
3998 off += 4; /* Skip over reserved area */
3999 /*
4000 * From spc4r17 6.3.15:
4001 *
4002 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4003 * IDENTIFIER field contains the relative port identifier (see
4004 * 3.1.120) of the target port that is part of the I_T nexus
4005 * described by this full status descriptor. If the ALL_TG_PT
4006 * bit is set to one, the contents of the RELATIVE TARGET PORT
4007 * IDENTIFIER field are not defined by this standard.
4008 */
6708bb27 4009 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 4010 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4011
4012 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4013 buf[off++] = (port->sep_rtpi & 0xff);
4014 } else
35d1efe8 4015 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 4016
4017 /*
4018 * Now, have the $FABRIC_MOD fill in the protocol identifier
4019 */
e3d6f909 4020 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 4021 se_nacl, pr_reg, &format_code, &buf[off+4]);
4022
4023 spin_lock(&pr_tmpl->registration_lock);
33940d09 4024 atomic_dec_mb(&pr_reg->pr_res_holders);
c66ac9db
NB		 4025 /*
4026 * Set the ADDITIONAL DESCRIPTOR LENGTH
4027 */
4028 buf[off++] = ((desc_len >> 24) & 0xff);
4029 buf[off++] = ((desc_len >> 16) & 0xff);
4030 buf[off++] = ((desc_len >> 8) & 0xff);
4031 buf[off++] = (desc_len & 0xff);
4032 /*
4033 * Size of full desctipor header minus TransportID
4034 * containing $FABRIC_MOD specific) initiator device/port
4035 * WWN information.
4036 *
4037 * See spc4r17 Section 6.13.5 Table 169
4038 */
4039 add_desc_len = (24 + desc_len);
4040
4041 off += desc_len;
4042 add_len += add_desc_len;
4043 }
4044 spin_unlock(&pr_tmpl->registration_lock);
4045 /*
4046 * Set ADDITIONAL_LENGTH
4047 */
4048 buf[4] = ((add_len >> 24) & 0xff);
4049 buf[5] = ((add_len >> 16) & 0xff);
4050 buf[6] = ((add_len >> 8) & 0xff);
4051 buf[7] = (add_len & 0xff);
4052
4949314c 4053 transport_kunmap_data_sg(cmd);
05d1c7c0 4054
c66ac9db
NB		 4055 return 0;
4056}
4057
de103c93
CH		 4058sense_reason_t
4059target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4060{
de103c93 4061 sense_reason_t ret;
e76a35d6 4062
c66ac9db
NB		 4063 /*
4064 * Following spc2r20 5.5.1 Reservations overview:
4065 *
4066 * If a logical unit has been reserved by any RESERVE command and is
4067 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4068 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4069 * initiator or service action and shall terminate with a RESERVATION
4070 * CONFLICT status.
4071 */
0fd97ccf 4072 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4073 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4074 " SPC-2 reservation is held, returning"
4075 " RESERVATION_CONFLICT\n");
de103c93 4076 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4077 }
4078
617c0e06
CH		 4079 switch (cmd->t_task_cdb[1] & 0x1f) {
4080 case PRI_READ_KEYS:
d29a5b6a
CH		 4081 ret = core_scsi3_pri_read_keys(cmd);
4082 break;
617c0e06 4083 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4084 ret = core_scsi3_pri_read_reservation(cmd);
4085 break;
617c0e06 4086 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4087 ret = core_scsi3_pri_report_capabilities(cmd);
4088 break;
617c0e06 4089 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4090 ret = core_scsi3_pri_read_full_status(cmd);
4091 break;
617c0e06
CH		 4092 default:
4093 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4094 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4095 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4096 }
4097
6bb35e00
CH		 4098 if (!ret)
4099 target_complete_cmd(cmd, GOOD);
d29a5b6a 4100 return ret;
c66ac9db
NB		 4101}
4102
de103c93
CH		 4103sense_reason_t
4104target_check_reservation(struct se_cmd *cmd)
c66ac9db 4105{
d977f437 4106 struct se_device *dev = cmd->se_dev;
de103c93 4107 sense_reason_t ret;
c66ac9db 4108
d977f437
CH		 4109 if (!cmd->se_sess)
4110 return 0;
4111 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4112 return 0;
4113 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4114 return 0;
c66ac9db 4115
d977f437
CH		 4116 spin_lock(&dev->dev_reservation_lock);
4117 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4118 ret = target_scsi2_reservation_check(cmd);
4119 else
4120 ret = target_scsi3_pr_reservation_check(cmd);
4121 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4122
d977f437 4123 return ret;
c66ac9db 4124}
Linux kernel - Deliverables
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