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Merge tag 'v3.10.87' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_pr.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_pr.c
3 *
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
6 *
fd9a11d7 7 * (c) Copyright 2009-2012 RisingTide Systems LLC.
c66ac9db
NB		 8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
c66ac9db
NB		 27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/list.h>
0e9b10a9 30#include <linux/file.h>
c66ac9db
NB		 31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33#include <asm/unaligned.h>
34
35#include <target/target_core_base.h>
c4795fb2
CH		 36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
c66ac9db
NB		 38#include <target/target_core_configfs.h>
39
e26d99ae 40#include "target_core_internal.h"
c66ac9db
NB		 41#include "target_core_pr.h"
42#include "target_core_ua.h"
43
44/*
45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
46 */
47struct pr_transport_id_holder {
48 int dest_local_nexus;
49 struct t10_pr_registration *dest_pr_reg;
50 struct se_portal_group *dest_tpg;
51 struct se_node_acl *dest_node_acl;
52 struct se_dev_entry *dest_se_deve;
53 struct list_head dest_list;
54};
55
56int core_pr_dump_initiator_port(
57 struct t10_pr_registration *pr_reg,
58 char *buf,
59 u32 size)
60{
6708bb27 61 if (!pr_reg->isid_present_at_reg)
c66ac9db
NB		 62 return 0;
63
64 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
65 return 1;
66}
67
68static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
69 struct t10_pr_registration *, int);
70
de103c93
CH		 71static sense_reason_t
72target_scsi2_reservation_check(struct se_cmd *cmd)
c66ac9db 73{
d977f437
CH		 74 struct se_device *dev = cmd->se_dev;
75 struct se_session *sess = cmd->se_sess;
76
77 switch (cmd->t_task_cdb[0]) {
c66ac9db
NB		 78 case INQUIRY:
79 case RELEASE:
80 case RELEASE_10:
81 return 0;
82 default:
d977f437 83 break;
c66ac9db
NB		 84 }
85
d977f437 86 if (!dev->dev_reserved_node_acl || !sess)
c66ac9db
NB		 87 return 0;
88
d977f437 89 if (dev->dev_reserved_node_acl != sess->se_node_acl)
de103c93 90 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 91
92 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
93 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
de103c93 94 return TCM_RESERVATION_CONFLICT;
c66ac9db 95 }
c66ac9db 96
d977f437 97 return 0;
c66ac9db
NB		 98}
99
eacac00c
CH		 100static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
101 struct se_node_acl *, struct se_session *);
102static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
103
087a03b3 104static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
eacac00c
CH		 105{
106 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 107 struct se_device *dev = cmd->se_dev;
eacac00c 108 struct t10_pr_registration *pr_reg;
0fd97ccf 109 struct t10_reservation *pr_tmpl = &dev->t10_pr;
eacac00c
CH		 110 int conflict = 0;
111
eacac00c
CH		 112 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
113 se_sess);
114 if (pr_reg) {
115 /*
116 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
117 * behavior
118 *
119 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
120 * status, but no reservation shall be established and the
121 * persistent reservation shall not be changed, if the command
122 * is received from a) and b) below.
123 *
124 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
125 * status, but the persistent reservation shall not be released,
126 * if the command is received from a) and b)
127 *
128 * a) An I_T nexus that is a persistent reservation holder; or
129 * b) An I_T nexus that is registered if a registrants only or
130 * all registrants type persistent reservation is present.
131 *
132 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
133 * RELEASE(6) command, or RELEASE(10) command shall be processed
134 * as defined in SPC-2.
135 */
136 if (pr_reg->pr_res_holder) {
137 core_scsi3_put_pr_reg(pr_reg);
087a03b3 138 return 1;
eacac00c
CH		 139 }
140 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
141 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
142 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
143 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
144 core_scsi3_put_pr_reg(pr_reg);
087a03b3 145 return 1;
eacac00c
CH		 146 }
147 core_scsi3_put_pr_reg(pr_reg);
148 conflict = 1;
149 } else {
150 /*
151 * Following spc2r20 5.5.1 Reservations overview:
152 *
153 * If a logical unit has executed a PERSISTENT RESERVE OUT
154 * command with the REGISTER or the REGISTER AND IGNORE
155 * EXISTING KEY service action and is still registered by any
156 * initiator, all RESERVE commands and all RELEASE commands
157 * regardless of initiator shall conflict and shall terminate
158 * with a RESERVATION CONFLICT status.
159 */
160 spin_lock(&pr_tmpl->registration_lock);
161 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
162 spin_unlock(&pr_tmpl->registration_lock);
163 }
164
165 if (conflict) {
166 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
167 " while active SPC-3 registrations exist,"
168 " returning RESERVATION_CONFLICT\n");
087a03b3 169 return -EBUSY;
eacac00c
CH		 170 }
171
087a03b3 172 return 0;
eacac00c
CH		 173}
174
de103c93
CH		 175sense_reason_t
176target_scsi2_reservation_release(struct se_cmd *cmd)
c66ac9db
NB		 177{
178 struct se_device *dev = cmd->se_dev;
179 struct se_session *sess = cmd->se_sess;
609234e3 180 struct se_portal_group *tpg;
de103c93 181 int rc;
c66ac9db 182
609234e3 183 if (!sess || !sess->se_tpg)
d29a5b6a 184 goto out;
087a03b3
NB		 185 rc = target_check_scsi2_reservation_conflict(cmd);
186 if (rc == 1)
d29a5b6a 187 goto out;
de103c93
CH		 188 if (rc < 0)
189 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 190
191 spin_lock(&dev->dev_reservation_lock);
d29a5b6a
CH		 192 if (!dev->dev_reserved_node_acl || !sess)
193 goto out_unlock;
194
195 if (dev->dev_reserved_node_acl != sess->se_node_acl)
196 goto out_unlock;
c66ac9db 197
edc318d9
BK		 198 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
199 goto out_unlock;
200
c66ac9db 201 dev->dev_reserved_node_acl = NULL;
0fd97ccf
CH		 202 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
203 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
c66ac9db 204 dev->dev_res_bin_isid = 0;
0fd97ccf 205 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 206 }
609234e3 207 tpg = sess->se_tpg;
6708bb27 208 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
e3d6f909
AG		 209 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
210 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 211 sess->se_node_acl->initiatorname);
c66ac9db 212
d29a5b6a
CH		 213out_unlock:
214 spin_unlock(&dev->dev_reservation_lock);
215out:
de103c93
CH		 216 target_complete_cmd(cmd, GOOD);
217 return 0;
c66ac9db
NB		 218}
219
de103c93
CH		 220sense_reason_t
221target_scsi2_reservation_reserve(struct se_cmd *cmd)
c66ac9db
NB		 222{
223 struct se_device *dev = cmd->se_dev;
224 struct se_session *sess = cmd->se_sess;
609234e3 225 struct se_portal_group *tpg;
de103c93
CH		 226 sense_reason_t ret = 0;
227 int rc;
c66ac9db 228
a1d8b49a
AG		 229 if ((cmd->t_task_cdb[1] & 0x01) &&
230 (cmd->t_task_cdb[1] & 0x02)) {
6708bb27 231 pr_err("LongIO and Obselete Bits set, returning"
c66ac9db 232 " ILLEGAL_REQUEST\n");
de103c93 233 return TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 234 }
235 /*
236 * This is currently the case for target_core_mod passthrough struct se_cmd
237 * ops
238 */
609234e3 239 if (!sess || !sess->se_tpg)
d29a5b6a 240 goto out;
087a03b3
NB		 241 rc = target_check_scsi2_reservation_conflict(cmd);
242 if (rc == 1)
d29a5b6a 243 goto out;
c66ac9db 244
de103c93
CH		 245 if (rc < 0)
246 return TCM_RESERVATION_CONFLICT;
247
609234e3 248 tpg = sess->se_tpg;
c66ac9db
NB		 249 spin_lock(&dev->dev_reservation_lock);
250 if (dev->dev_reserved_node_acl &&
251 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
6708bb27 252 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
e3d6f909 253 tpg->se_tpg_tfo->get_fabric_name());
6708bb27 254 pr_err("Original reserver LUN: %u %s\n",
e3d6f909 255 cmd->se_lun->unpacked_lun,
c66ac9db 256 dev->dev_reserved_node_acl->initiatorname);
6708bb27 257 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
e3d6f909 258 " from %s \n", cmd->se_lun->unpacked_lun,
c66ac9db
NB		 259 cmd->se_deve->mapped_lun,
260 sess->se_node_acl->initiatorname);
de103c93 261 ret = TCM_RESERVATION_CONFLICT;
d29a5b6a 262 goto out_unlock;
c66ac9db
NB		 263 }
264
265 dev->dev_reserved_node_acl = sess->se_node_acl;
0fd97ccf 266 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
c66ac9db
NB		 267 if (sess->sess_bin_isid != 0) {
268 dev->dev_res_bin_isid = sess->sess_bin_isid;
0fd97ccf 269 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
c66ac9db 270 }
6708bb27 271 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
e3d6f909
AG		 272 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
273 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
c66ac9db 274 sess->se_node_acl->initiatorname);
c66ac9db 275
d29a5b6a
CH		 276out_unlock:
277 spin_unlock(&dev->dev_reservation_lock);
278out:
6bb35e00
CH		 279 if (!ret)
280 target_complete_cmd(cmd, GOOD);
d29a5b6a 281 return ret;
c66ac9db
NB		 282}
283
c66ac9db
NB		 284
285/*
286 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
287 *
288 * This function is called by those initiator ports who are *NOT*
289 * the active PR reservation holder when a reservation is present.
290 */
291static int core_scsi3_pr_seq_non_holder(
292 struct se_cmd *cmd,
c66ac9db
NB		 293 u32 pr_reg_type)
294{
d977f437 295 unsigned char *cdb = cmd->t_task_cdb;
c66ac9db 296 struct se_dev_entry *se_deve;
e3d6f909 297 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 298 int other_cdb = 0, ignore_reg;
299 int registered_nexus = 0, ret = 1; /* Conflict by default */
300 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
301 int we = 0; /* Write Exclusive */
302 int legacy = 0; /* Act like a legacy device and return
303 * RESERVATION CONFLICT on some CDBs */
c66ac9db 304
f2083241 305 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 306 /*
307 * Determine if the registration should be ignored due to
d977f437 308 * non-matching ISIDs in target_scsi3_pr_reservation_check().
c66ac9db
NB		 309 */
310 ignore_reg = (pr_reg_type & 0x80000000);
311 if (ignore_reg)
312 pr_reg_type &= ~0x80000000;
313
314 switch (pr_reg_type) {
315 case PR_TYPE_WRITE_EXCLUSIVE:
316 we = 1;
317 case PR_TYPE_EXCLUSIVE_ACCESS:
318 /*
319 * Some commands are only allowed for the persistent reservation
320 * holder.
321 */
322 if ((se_deve->def_pr_registered) && !(ignore_reg))
323 registered_nexus = 1;
324 break;
325 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
326 we = 1;
327 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
328 /*
329 * Some commands are only allowed for registered I_T Nexuses.
330 */
331 reg_only = 1;
332 if ((se_deve->def_pr_registered) && !(ignore_reg))
333 registered_nexus = 1;
334 break;
335 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
336 we = 1;
337 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
338 /*
339 * Each registered I_T Nexus is a reservation holder.
340 */
341 all_reg = 1;
342 if ((se_deve->def_pr_registered) && !(ignore_reg))
343 registered_nexus = 1;
344 break;
345 default:
e3d6f909 346 return -EINVAL;
c66ac9db
NB		 347 }
348 /*
349 * Referenced from spc4r17 table 45 for *NON* PR holder access
350 */
351 switch (cdb[0]) {
352 case SECURITY_PROTOCOL_IN:
353 if (registered_nexus)
354 return 0;
355 ret = (we) ? 0 : 1;
356 break;
357 case MODE_SENSE:
358 case MODE_SENSE_10:
359 case READ_ATTRIBUTE:
360 case READ_BUFFER:
361 case RECEIVE_DIAGNOSTIC:
362 if (legacy) {
363 ret = 1;
364 break;
365 }
366 if (registered_nexus) {
367 ret = 0;
368 break;
369 }
370 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
371 break;
372 case PERSISTENT_RESERVE_OUT:
373 /*
374 * This follows PERSISTENT_RESERVE_OUT service actions that
375 * are allowed in the presence of various reservations.
376 * See spc4r17, table 46
377 */
378 switch (cdb[1] & 0x1f) {
379 case PRO_CLEAR:
380 case PRO_PREEMPT:
381 case PRO_PREEMPT_AND_ABORT:
382 ret = (registered_nexus) ? 0 : 1;
383 break;
384 case PRO_REGISTER:
385 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
386 ret = 0;
387 break;
388 case PRO_REGISTER_AND_MOVE:
389 case PRO_RESERVE:
390 ret = 1;
391 break;
392 case PRO_RELEASE:
393 ret = (registered_nexus) ? 0 : 1;
394 break;
395 default:
6708bb27 396 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 397 " action: 0x%02x\n", cdb[1] & 0x1f);
e3d6f909 398 return -EINVAL;
c66ac9db
NB		 399 }
400 break;
401 case RELEASE:
402 case RELEASE_10:
eacac00c 403 /* Handled by CRH=1 in target_scsi2_reservation_release() */
c66ac9db
NB		 404 ret = 0;
405 break;
406 case RESERVE:
407 case RESERVE_10:
eacac00c 408 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
c66ac9db
NB		 409 ret = 0;
410 break;
411 case TEST_UNIT_READY:
412 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
413 break;
414 case MAINTENANCE_IN:
415 switch (cdb[1] & 0x1f) {
416 case MI_MANAGEMENT_PROTOCOL_IN:
417 if (registered_nexus) {
418 ret = 0;
419 break;
420 }
421 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
422 break;
423 case MI_REPORT_SUPPORTED_OPERATION_CODES:
424 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
425 if (legacy) {
426 ret = 1;
427 break;
428 }
429 if (registered_nexus) {
430 ret = 0;
431 break;
432 }
433 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
434 break;
435 case MI_REPORT_ALIASES:
436 case MI_REPORT_IDENTIFYING_INFORMATION:
437 case MI_REPORT_PRIORITY:
438 case MI_REPORT_TARGET_PGS:
439 case MI_REPORT_TIMESTAMP:
440 ret = 0; /* Allowed */
441 break;
442 default:
6708bb27 443 pr_err("Unknown MI Service Action: 0x%02x\n",
c66ac9db 444 (cdb[1] & 0x1f));
e3d6f909 445 return -EINVAL;
c66ac9db
NB		 446 }
447 break;
448 case ACCESS_CONTROL_IN:
449 case ACCESS_CONTROL_OUT:
450 case INQUIRY:
451 case LOG_SENSE:
452 case READ_MEDIA_SERIAL_NUMBER:
453 case REPORT_LUNS:
454 case REQUEST_SENSE:
6816966a 455 case PERSISTENT_RESERVE_IN:
c66ac9db
NB		 456 ret = 0; /*/ Allowed CDBs */
457 break;
458 default:
459 other_cdb = 1;
460 break;
461 }
462 /*
25985edc 463 * Case where the CDB is explicitly allowed in the above switch
c66ac9db
NB		 464 * statement.
465 */
6708bb27 466 if (!ret && !other_cdb) {
6708bb27 467 pr_debug("Allowing explict CDB: 0x%02x for %s"
c66ac9db
NB		 468 " reservation holder\n", cdb[0],
469 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 470
c66ac9db
NB		 471 return ret;
472 }
473 /*
474 * Check if write exclusive initiator ports *NOT* holding the
475 * WRITE_EXCLUSIVE_* reservation.
476 */
ee1b1b9c 477 if (we && !registered_nexus) {
c66ac9db
NB		 478 if (cmd->data_direction == DMA_TO_DEVICE) {
479 /*
480 * Conflict for write exclusive
481 */
6708bb27 482 pr_debug("%s Conflict for unregistered nexus"
c66ac9db
NB		 483 " %s CDB: 0x%02x to %s reservation\n",
484 transport_dump_cmd_direction(cmd),
485 se_sess->se_node_acl->initiatorname, cdb[0],
486 core_scsi3_pr_dump_type(pr_reg_type));
487 return 1;
488 } else {
489 /*
490 * Allow non WRITE CDBs for all Write Exclusive
491 * PR TYPEs to pass for registered and
492 * non-registered_nexuxes NOT holding the reservation.
493 *
494 * We only make noise for the unregisterd nexuses,
495 * as we expect registered non-reservation holding
496 * nexuses to issue CDBs.
497 */
8b1e1244 498
6708bb27
AG		 499 if (!registered_nexus) {
500 pr_debug("Allowing implict CDB: 0x%02x"
c66ac9db
NB		 501 " for %s reservation on unregistered"
502 " nexus\n", cdb[0],
503 core_scsi3_pr_dump_type(pr_reg_type));
504 }
8b1e1244 505
c66ac9db
NB		 506 return 0;
507 }
508 } else if ((reg_only) || (all_reg)) {
509 if (registered_nexus) {
510 /*
511 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
512 * allow commands from registered nexuses.
513 */
8b1e1244 514
6708bb27 515 pr_debug("Allowing implict CDB: 0x%02x for %s"
c66ac9db
NB		 516 " reservation\n", cdb[0],
517 core_scsi3_pr_dump_type(pr_reg_type));
8b1e1244 518
c66ac9db
NB		 519 return 0;
520 }
362684ea
LD		 521 } else if (we && registered_nexus) {
522 /*
523 * Reads are allowed for Write Exclusive locks
524 * from all registrants.
525 */
526 if (cmd->data_direction == DMA_FROM_DEVICE) {
527 pr_debug("Allowing READ CDB: 0x%02x for %s"
528 " reservation\n", cdb[0],
529 core_scsi3_pr_dump_type(pr_reg_type));
530
531 return 0;
532 }
c66ac9db 533 }
6708bb27 534 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
c66ac9db
NB		 535 " for %s reservation\n", transport_dump_cmd_direction(cmd),
536 (registered_nexus) ? "" : "un",
537 se_sess->se_node_acl->initiatorname, cdb[0],
538 core_scsi3_pr_dump_type(pr_reg_type));
539
540 return 1; /* Conflict by default */
541}
542
de103c93
CH		 543static sense_reason_t
544target_scsi3_pr_reservation_check(struct se_cmd *cmd)
d977f437
CH		 545{
546 struct se_device *dev = cmd->se_dev;
547 struct se_session *sess = cmd->se_sess;
548 u32 pr_reg_type;
549
550 if (!dev->dev_pr_res_holder)
551 return 0;
552
553 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
554 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
555 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
556 goto check_nonholder;
557
558 if (dev->dev_pr_res_holder->isid_present_at_reg) {
559 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
560 sess->sess_bin_isid) {
561 pr_reg_type |= 0x80000000;
562 goto check_nonholder;
563 }
564 }
565
566 return 0;
567
568check_nonholder:
569 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
de103c93 570 return TCM_RESERVATION_CONFLICT;
d977f437
CH		 571 return 0;
572}
573
c66ac9db
NB		 574static u32 core_scsi3_pr_generation(struct se_device *dev)
575{
c66ac9db 576 u32 prg;
0fd97ccf 577
c66ac9db
NB		 578 /*
579 * PRGeneration field shall contain the value of a 32-bit wrapping
580 * counter mainted by the device server.
581 *
582 * Note that this is done regardless of Active Persist across
583 * Target PowerLoss (APTPL)
584 *
585 * See spc4r17 section 6.3.12 READ_KEYS service action
586 */
587 spin_lock(&dev->dev_reservation_lock);
0fd97ccf 588 prg = dev->t10_pr.pr_generation++;
c66ac9db
NB		 589 spin_unlock(&dev->dev_reservation_lock);
590
591 return prg;
592}
593
c66ac9db
NB		 594static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
595 struct se_device *dev,
596 struct se_node_acl *nacl,
597 struct se_dev_entry *deve,
598 unsigned char *isid,
599 u64 sa_res_key,
600 int all_tg_pt,
601 int aptpl)
602{
c66ac9db
NB		 603 struct t10_pr_registration *pr_reg;
604
605 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
6708bb27
AG		 606 if (!pr_reg) {
607 pr_err("Unable to allocate struct t10_pr_registration\n");
c66ac9db
NB		 608 return NULL;
609 }
610
0fd97ccf 611 pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len,
c66ac9db 612 GFP_ATOMIC);
6708bb27
AG		 613 if (!pr_reg->pr_aptpl_buf) {
614 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
c66ac9db
NB		 615 kmem_cache_free(t10_pr_reg_cache, pr_reg);
616 return NULL;
617 }
618
619 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
620 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
621 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
622 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
623 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
624 atomic_set(&pr_reg->pr_res_holders, 0);
625 pr_reg->pr_reg_nacl = nacl;
626 pr_reg->pr_reg_deve = deve;
627 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
628 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
629 pr_reg->pr_res_key = sa_res_key;
630 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
631 pr_reg->pr_reg_aptpl = aptpl;
632 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
633 /*
634 * If an ISID value for this SCSI Initiator Port exists,
635 * save it to the registration now.
636 */
637 if (isid != NULL) {
638 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
639 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
640 pr_reg->isid_present_at_reg = 1;
641 }
642
643 return pr_reg;
644}
645
646static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
647static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
648
649/*
650 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
651 * modes.
652 */
653static struct t10_pr_registration *__core_scsi3_alloc_registration(
654 struct se_device *dev,
655 struct se_node_acl *nacl,
656 struct se_dev_entry *deve,
657 unsigned char *isid,
658 u64 sa_res_key,
659 int all_tg_pt,
660 int aptpl)
661{
662 struct se_dev_entry *deve_tmp;
663 struct se_node_acl *nacl_tmp;
664 struct se_port *port, *port_tmp;
665 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
666 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
667 int ret;
668 /*
669 * Create a registration for the I_T Nexus upon which the
670 * PROUT REGISTER was received.
671 */
672 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
673 sa_res_key, all_tg_pt, aptpl);
6708bb27 674 if (!pr_reg)
c66ac9db
NB		 675 return NULL;
676 /*
677 * Return pointer to pr_reg for ALL_TG_PT=0
678 */
6708bb27 679 if (!all_tg_pt)
c66ac9db
NB		 680 return pr_reg;
681 /*
682 * Create list of matching SCSI Initiator Port registrations
683 * for ALL_TG_PT=1
684 */
685 spin_lock(&dev->se_port_lock);
686 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
687 atomic_inc(&port->sep_tg_pt_ref_cnt);
688 smp_mb__after_atomic_inc();
689 spin_unlock(&dev->se_port_lock);
690
691 spin_lock_bh(&port->sep_alua_lock);
692 list_for_each_entry(deve_tmp, &port->sep_alua_list,
693 alua_port_list) {
694 /*
695 * This pointer will be NULL for demo mode MappedLUNs
696 * that have not been make explict via a ConfigFS
697 * MappedLUN group for the SCSI Initiator Node ACL.
698 */
6708bb27 699 if (!deve_tmp->se_lun_acl)
c66ac9db
NB		 700 continue;
701
702 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
703 /*
704 * Skip the matching struct se_node_acl that is allocated
705 * above..
706 */
707 if (nacl == nacl_tmp)
708 continue;
709 /*
710 * Only perform PR registrations for target ports on
711 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
712 * arrived.
713 */
714 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
715 continue;
716 /*
717 * Look for a matching Initiator Node ACL in ASCII format
718 */
719 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
720 continue;
721
722 atomic_inc(&deve_tmp->pr_ref_count);
723 smp_mb__after_atomic_inc();
724 spin_unlock_bh(&port->sep_alua_lock);
725 /*
726 * Grab a configfs group dependency that is released
727 * for the exception path at label out: below, or upon
728 * completion of adding ALL_TG_PT=1 registrations in
729 * __core_scsi3_add_registration()
730 */
731 ret = core_scsi3_lunacl_depend_item(deve_tmp);
732 if (ret < 0) {
6708bb27 733 pr_err("core_scsi3_lunacl_depend"
c66ac9db
NB		 734 "_item() failed\n");
735 atomic_dec(&port->sep_tg_pt_ref_cnt);
736 smp_mb__after_atomic_dec();
737 atomic_dec(&deve_tmp->pr_ref_count);
738 smp_mb__after_atomic_dec();
739 goto out;
740 }
741 /*
742 * Located a matching SCSI Initiator Port on a different
743 * port, allocate the pr_reg_atp and attach it to the
744 * pr_reg->pr_reg_atp_list that will be processed once
745 * the original *pr_reg is processed in
746 * __core_scsi3_add_registration()
747 */
748 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
749 nacl_tmp, deve_tmp, NULL,
750 sa_res_key, all_tg_pt, aptpl);
6708bb27 751 if (!pr_reg_atp) {
c66ac9db
NB		 752 atomic_dec(&port->sep_tg_pt_ref_cnt);
753 smp_mb__after_atomic_dec();
754 atomic_dec(&deve_tmp->pr_ref_count);
755 smp_mb__after_atomic_dec();
756 core_scsi3_lunacl_undepend_item(deve_tmp);
757 goto out;
758 }
759
760 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
761 &pr_reg->pr_reg_atp_list);
762 spin_lock_bh(&port->sep_alua_lock);
763 }
764 spin_unlock_bh(&port->sep_alua_lock);
765
766 spin_lock(&dev->se_port_lock);
767 atomic_dec(&port->sep_tg_pt_ref_cnt);
768 smp_mb__after_atomic_dec();
769 }
770 spin_unlock(&dev->se_port_lock);
771
772 return pr_reg;
773out:
774 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
775 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
776 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
777 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
778 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
779 }
780 kmem_cache_free(t10_pr_reg_cache, pr_reg);
781 return NULL;
782}
783
784int core_scsi3_alloc_aptpl_registration(
e3d6f909 785 struct t10_reservation *pr_tmpl,
c66ac9db
NB		 786 u64 sa_res_key,
787 unsigned char *i_port,
788 unsigned char *isid,
789 u32 mapped_lun,
790 unsigned char *t_port,
791 u16 tpgt,
792 u32 target_lun,
793 int res_holder,
794 int all_tg_pt,
795 u8 type)
796{
797 struct t10_pr_registration *pr_reg;
798
6708bb27
AG		 799 if (!i_port || !t_port || !sa_res_key) {
800 pr_err("Illegal parameters for APTPL registration\n");
e3d6f909 801 return -EINVAL;
c66ac9db
NB		 802 }
803
804 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
6708bb27
AG		 805 if (!pr_reg) {
806 pr_err("Unable to allocate struct t10_pr_registration\n");
e3d6f909 807 return -ENOMEM;
c66ac9db
NB		 808 }
809 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
810
811 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
812 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
813 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
814 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
815 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
816 atomic_set(&pr_reg->pr_res_holders, 0);
817 pr_reg->pr_reg_nacl = NULL;
818 pr_reg->pr_reg_deve = NULL;
819 pr_reg->pr_res_mapped_lun = mapped_lun;
820 pr_reg->pr_aptpl_target_lun = target_lun;
821 pr_reg->pr_res_key = sa_res_key;
822 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
823 pr_reg->pr_reg_aptpl = 1;
824 pr_reg->pr_reg_tg_pt_lun = NULL;
825 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
826 pr_reg->pr_res_type = type;
827 /*
828 * If an ISID value had been saved in APTPL metadata for this
829 * SCSI Initiator Port, restore it now.
830 */
831 if (isid != NULL) {
832 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
833 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
834 pr_reg->isid_present_at_reg = 1;
835 }
836 /*
837 * Copy the i_port and t_port information from caller.
838 */
839 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
840 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
841 pr_reg->pr_reg_tpgt = tpgt;
842 /*
843 * Set pr_res_holder from caller, the pr_reg who is the reservation
844 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
845 * the Initiator Node LUN ACL from the fabric module is created for
846 * this registration.
847 */
848 pr_reg->pr_res_holder = res_holder;
849
850 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
6708bb27 851 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
c66ac9db
NB		 852 " metadata\n", (res_holder) ? "+reservation" : "");
853 return 0;
854}
855
856static void core_scsi3_aptpl_reserve(
857 struct se_device *dev,
858 struct se_portal_group *tpg,
859 struct se_node_acl *node_acl,
860 struct t10_pr_registration *pr_reg)
861{
862 char i_buf[PR_REG_ISID_ID_LEN];
863 int prf_isid;
864
865 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
866 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
867 PR_REG_ISID_ID_LEN);
868
869 spin_lock(&dev->dev_reservation_lock);
870 dev->dev_pr_res_holder = pr_reg;
871 spin_unlock(&dev->dev_reservation_lock);
872
6708bb27 873 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
c66ac9db 874 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 875 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 876 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
877 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 878 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 879 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
c66ac9db
NB		 880 (prf_isid) ? &i_buf[0] : "");
881}
882
883static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
884 struct t10_pr_registration *, int, int);
885
886static int __core_scsi3_check_aptpl_registration(
887 struct se_device *dev,
888 struct se_portal_group *tpg,
889 struct se_lun *lun,
890 u32 target_lun,
891 struct se_node_acl *nacl,
892 struct se_dev_entry *deve)
893{
894 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 895 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 896 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
897 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
898 u16 tpgt;
899
900 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
901 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
902 /*
903 * Copy Initiator Port information from struct se_node_acl
904 */
905 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
906 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
e3d6f909
AG		 907 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
908 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
c66ac9db
NB		 909 /*
910 * Look for the matching registrations+reservation from those
911 * created from APTPL metadata. Note that multiple registrations
912 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
913 * TransportIDs.
914 */
915 spin_lock(&pr_tmpl->aptpl_reg_lock);
916 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
917 pr_reg_aptpl_list) {
6708bb27 918 if (!strcmp(pr_reg->pr_iport, i_port) &&
c66ac9db
NB		 919 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
920 !(strcmp(pr_reg->pr_tport, t_port)) &&
921 (pr_reg->pr_reg_tpgt == tpgt) &&
922 (pr_reg->pr_aptpl_target_lun == target_lun)) {
923
924 pr_reg->pr_reg_nacl = nacl;
925 pr_reg->pr_reg_deve = deve;
926 pr_reg->pr_reg_tg_pt_lun = lun;
927
928 list_del(&pr_reg->pr_reg_aptpl_list);
929 spin_unlock(&pr_tmpl->aptpl_reg_lock);
930 /*
931 * At this point all of the pointers in *pr_reg will
932 * be setup, so go ahead and add the registration.
933 */
934
935 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
936 /*
937 * If this registration is the reservation holder,
938 * make that happen now..
939 */
940 if (pr_reg->pr_res_holder)
941 core_scsi3_aptpl_reserve(dev, tpg,
942 nacl, pr_reg);
943 /*
944 * Reenable pr_aptpl_active to accept new metadata
945 * updates once the SCSI device is active again..
946 */
947 spin_lock(&pr_tmpl->aptpl_reg_lock);
948 pr_tmpl->pr_aptpl_active = 1;
949 }
950 }
951 spin_unlock(&pr_tmpl->aptpl_reg_lock);
952
953 return 0;
954}
955
956int core_scsi3_check_aptpl_registration(
957 struct se_device *dev,
958 struct se_portal_group *tpg,
959 struct se_lun *lun,
ec0f40e8
NB		 960 struct se_node_acl *nacl,
961 u32 mapped_lun)
c66ac9db 962{
ec0f40e8 963 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
c66ac9db 964
d977f437 965 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
c66ac9db
NB		 966 return 0;
967
968 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
969 lun->unpacked_lun, nacl, deve);
970}
971
972static void __core_scsi3_dump_registration(
973 struct target_core_fabric_ops *tfo,
974 struct se_device *dev,
975 struct se_node_acl *nacl,
976 struct t10_pr_registration *pr_reg,
977 int register_type)
978{
979 struct se_portal_group *se_tpg = nacl->se_tpg;
980 char i_buf[PR_REG_ISID_ID_LEN];
981 int prf_isid;
982
983 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
984 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
985 PR_REG_ISID_ID_LEN);
986
6708bb27 987 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
c66ac9db
NB		 988 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
989 "_AND_MOVE" : (register_type == 1) ?
990 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
991 (prf_isid) ? i_buf : "");
6708bb27 992 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
c66ac9db
NB		 993 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
994 tfo->tpg_get_tag(se_tpg));
6708bb27 995 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 996 " Port(s)\n", tfo->get_fabric_name(),
997 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 998 dev->transport->name);
6708bb27 999 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1000 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1001 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1002 pr_reg->pr_reg_aptpl);
1003}
1004
1005/*
1006 * this function can be called with struct se_device->dev_reservation_lock
1007 * when register_move = 1
1008 */
1009static void __core_scsi3_add_registration(
1010 struct se_device *dev,
1011 struct se_node_acl *nacl,
1012 struct t10_pr_registration *pr_reg,
1013 int register_type,
1014 int register_move)
1015{
c66ac9db
NB		 1016 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1017 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
0fd97ccf 1018 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1019
1020 /*
1021 * Increment PRgeneration counter for struct se_device upon a successful
1022 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1023 *
1024 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1025 * action, the struct se_device->dev_reservation_lock will already be held,
1026 * so we do not call core_scsi3_pr_generation() which grabs the lock
1027 * for the REGISTER.
1028 */
1029 pr_reg->pr_res_generation = (register_move) ?
0fd97ccf 1030 dev->t10_pr.pr_generation++ :
c66ac9db
NB		 1031 core_scsi3_pr_generation(dev);
1032
1033 spin_lock(&pr_tmpl->registration_lock);
1034 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1035 pr_reg->pr_reg_deve->def_pr_registered = 1;
1036
1037 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1038 spin_unlock(&pr_tmpl->registration_lock);
1039 /*
1040 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1041 */
6708bb27 1042 if (!pr_reg->pr_reg_all_tg_pt || register_move)
c66ac9db
NB		 1043 return;
1044 /*
1045 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1046 * allocated in __core_scsi3_alloc_registration()
1047 */
1048 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1049 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1050 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1051
1052 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1053
1054 spin_lock(&pr_tmpl->registration_lock);
1055 list_add_tail(&pr_reg_tmp->pr_reg_list,
1056 &pr_tmpl->registration_list);
1057 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1058
1059 __core_scsi3_dump_registration(tfo, dev,
1060 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1061 register_type);
1062 spin_unlock(&pr_tmpl->registration_lock);
1063 /*
1064 * Drop configfs group dependency reference from
1065 * __core_scsi3_alloc_registration()
1066 */
1067 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1068 }
1069}
1070
1071static int core_scsi3_alloc_registration(
1072 struct se_device *dev,
1073 struct se_node_acl *nacl,
1074 struct se_dev_entry *deve,
1075 unsigned char *isid,
1076 u64 sa_res_key,
1077 int all_tg_pt,
1078 int aptpl,
1079 int register_type,
1080 int register_move)
1081{
1082 struct t10_pr_registration *pr_reg;
1083
1084 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1085 sa_res_key, all_tg_pt, aptpl);
6708bb27 1086 if (!pr_reg)
e3d6f909 1087 return -EPERM;
c66ac9db
NB		 1088
1089 __core_scsi3_add_registration(dev, nacl, pr_reg,
1090 register_type, register_move);
1091 return 0;
1092}
1093
1094static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1095 struct se_device *dev,
1096 struct se_node_acl *nacl,
1097 unsigned char *isid)
1098{
0fd97ccf 1099 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1100 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1101 struct se_portal_group *tpg;
1102
1103 spin_lock(&pr_tmpl->registration_lock);
1104 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1105 &pr_tmpl->registration_list, pr_reg_list) {
1106 /*
1107 * First look for a matching struct se_node_acl
1108 */
1109 if (pr_reg->pr_reg_nacl != nacl)
1110 continue;
1111
1112 tpg = pr_reg->pr_reg_nacl->se_tpg;
1113 /*
1114 * If this registration does NOT contain a fabric provided
1115 * ISID, then we have found a match.
1116 */
6708bb27 1117 if (!pr_reg->isid_present_at_reg) {
c66ac9db
NB		 1118 /*
1119 * Determine if this SCSI device server requires that
1120 * SCSI Intiatior TransportID w/ ISIDs is enforced
1121 * for fabric modules (iSCSI) requiring them.
1122 */
e3d6f909 1123 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
0fd97ccf 1124 if (dev->dev_attrib.enforce_pr_isids)
c66ac9db
NB		 1125 continue;
1126 }
1127 atomic_inc(&pr_reg->pr_res_holders);
1128 smp_mb__after_atomic_inc();
1129 spin_unlock(&pr_tmpl->registration_lock);
1130 return pr_reg;
1131 }
1132 /*
1133 * If the *pr_reg contains a fabric defined ISID for multi-value
1134 * SCSI Initiator Port TransportIDs, then we expect a valid
1135 * matching ISID to be provided by the local SCSI Initiator Port.
1136 */
6708bb27 1137 if (!isid)
c66ac9db
NB		 1138 continue;
1139 if (strcmp(isid, pr_reg->pr_reg_isid))
1140 continue;
1141
1142 atomic_inc(&pr_reg->pr_res_holders);
1143 smp_mb__after_atomic_inc();
1144 spin_unlock(&pr_tmpl->registration_lock);
1145 return pr_reg;
1146 }
1147 spin_unlock(&pr_tmpl->registration_lock);
1148
1149 return NULL;
1150}
1151
1152static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1153 struct se_device *dev,
1154 struct se_node_acl *nacl,
1155 struct se_session *sess)
1156{
1157 struct se_portal_group *tpg = nacl->se_tpg;
1158 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1159
e3d6f909 1160 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 1161 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 1162 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
c66ac9db
NB		 1163 PR_REG_ISID_LEN);
1164 isid_ptr = &buf[0];
1165 }
1166
1167 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1168}
1169
1170static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1171{
1172 atomic_dec(&pr_reg->pr_res_holders);
1173 smp_mb__after_atomic_dec();
1174}
1175
1176static int core_scsi3_check_implict_release(
1177 struct se_device *dev,
1178 struct t10_pr_registration *pr_reg)
1179{
1180 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1181 struct t10_pr_registration *pr_res_holder;
1182 int ret = 0;
1183
1184 spin_lock(&dev->dev_reservation_lock);
1185 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 1186 if (!pr_res_holder) {
c66ac9db
NB		 1187 spin_unlock(&dev->dev_reservation_lock);
1188 return ret;
1189 }
1190 if (pr_res_holder == pr_reg) {
1191 /*
1192 * Perform an implict RELEASE if the registration that
1193 * is being released is holding the reservation.
1194 *
1195 * From spc4r17, section 5.7.11.1:
1196 *
1197 * e) If the I_T nexus is the persistent reservation holder
1198 * and the persistent reservation is not an all registrants
1199 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1200 * service action or REGISTER AND IGNORE EXISTING KEY
1201 * service action with the SERVICE ACTION RESERVATION KEY
1202 * field set to zero (see 5.7.11.3).
1203 */
1204 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1205 ret = 1;
1206 /*
1207 * For 'All Registrants' reservation types, all existing
1208 * registrations are still processed as reservation holders
1209 * in core_scsi3_pr_seq_non_holder() after the initial
1210 * reservation holder is implictly released here.
1211 */
1212 } else if (pr_reg->pr_reg_all_tg_pt &&
1213 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1214 pr_reg->pr_reg_nacl->initiatorname)) &&
1215 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
6708bb27 1216 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
c66ac9db
NB		 1217 " UNREGISTER while existing reservation with matching"
1218 " key 0x%016Lx is present from another SCSI Initiator"
1219 " Port\n", pr_reg->pr_res_key);
e3d6f909 1220 ret = -EPERM;
c66ac9db
NB		 1221 }
1222 spin_unlock(&dev->dev_reservation_lock);
1223
1224 return ret;
1225}
1226
1227/*
e3d6f909 1228 * Called with struct t10_reservation->registration_lock held.
c66ac9db
NB		 1229 */
1230static void __core_scsi3_free_registration(
1231 struct se_device *dev,
1232 struct t10_pr_registration *pr_reg,
1233 struct list_head *preempt_and_abort_list,
1234 int dec_holders)
1235{
1236 struct target_core_fabric_ops *tfo =
1237 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
0fd97ccf 1238 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1239 char i_buf[PR_REG_ISID_ID_LEN];
1240 int prf_isid;
1241
1242 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1243 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1244 PR_REG_ISID_ID_LEN);
1245
1246 pr_reg->pr_reg_deve->def_pr_registered = 0;
1247 pr_reg->pr_reg_deve->pr_res_key = 0;
1248 list_del(&pr_reg->pr_reg_list);
1249 /*
1250 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1251 * so call core_scsi3_put_pr_reg() to decrement our reference.
1252 */
1253 if (dec_holders)
1254 core_scsi3_put_pr_reg(pr_reg);
1255 /*
1256 * Wait until all reference from any other I_T nexuses for this
1257 * *pr_reg have been released. Because list_del() is called above,
1258 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1259 * count back to zero, and we release *pr_reg.
1260 */
1261 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1262 spin_unlock(&pr_tmpl->registration_lock);
6708bb27 1263 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
c66ac9db
NB		 1264 tfo->get_fabric_name());
1265 cpu_relax();
1266 spin_lock(&pr_tmpl->registration_lock);
1267 }
1268
6708bb27 1269 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
c66ac9db
NB		 1270 " Node: %s%s\n", tfo->get_fabric_name(),
1271 pr_reg->pr_reg_nacl->initiatorname,
1272 (prf_isid) ? &i_buf[0] : "");
6708bb27 1273 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
c66ac9db
NB		 1274 " Port(s)\n", tfo->get_fabric_name(),
1275 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
e3d6f909 1276 dev->transport->name);
6708bb27 1277 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
c66ac9db
NB		 1278 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1279 pr_reg->pr_res_generation);
1280
6708bb27 1281 if (!preempt_and_abort_list) {
c66ac9db
NB		 1282 pr_reg->pr_reg_deve = NULL;
1283 pr_reg->pr_reg_nacl = NULL;
1284 kfree(pr_reg->pr_aptpl_buf);
1285 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1286 return;
1287 }
1288 /*
1289 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1290 * are released once the ABORT_TASK_SET has completed..
1291 */
1292 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1293}
1294
1295void core_scsi3_free_pr_reg_from_nacl(
1296 struct se_device *dev,
1297 struct se_node_acl *nacl)
1298{
0fd97ccf 1299 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1300 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1301 /*
1302 * If the passed se_node_acl matches the reservation holder,
1303 * release the reservation.
1304 */
1305 spin_lock(&dev->dev_reservation_lock);
1306 pr_res_holder = dev->dev_pr_res_holder;
1307 if ((pr_res_holder != NULL) &&
1308 (pr_res_holder->pr_reg_nacl == nacl))
1309 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1310 spin_unlock(&dev->dev_reservation_lock);
1311 /*
1312 * Release any registration associated with the struct se_node_acl.
1313 */
1314 spin_lock(&pr_tmpl->registration_lock);
1315 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1316 &pr_tmpl->registration_list, pr_reg_list) {
1317
1318 if (pr_reg->pr_reg_nacl != nacl)
1319 continue;
1320
1321 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1322 }
1323 spin_unlock(&pr_tmpl->registration_lock);
1324}
1325
1326void core_scsi3_free_all_registrations(
1327 struct se_device *dev)
1328{
0fd97ccf 1329 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 1330 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1331
1332 spin_lock(&dev->dev_reservation_lock);
1333 pr_res_holder = dev->dev_pr_res_holder;
1334 if (pr_res_holder != NULL) {
1335 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1336 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1337 pr_res_holder, 0);
1338 }
1339 spin_unlock(&dev->dev_reservation_lock);
1340
1341 spin_lock(&pr_tmpl->registration_lock);
1342 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1343 &pr_tmpl->registration_list, pr_reg_list) {
1344
1345 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1346 }
1347 spin_unlock(&pr_tmpl->registration_lock);
1348
1349 spin_lock(&pr_tmpl->aptpl_reg_lock);
1350 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1351 pr_reg_aptpl_list) {
1352 list_del(&pr_reg->pr_reg_aptpl_list);
1353 kfree(pr_reg->pr_aptpl_buf);
1354 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1355 }
1356 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1357}
1358
1359static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1360{
e3d6f909 1361 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1362 &tpg->tpg_group.cg_item);
1363}
1364
1365static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1366{
e3d6f909 1367 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1368 &tpg->tpg_group.cg_item);
1369
1370 atomic_dec(&tpg->tpg_pr_ref_count);
1371 smp_mb__after_atomic_dec();
1372}
1373
1374static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1375{
1376 struct se_portal_group *tpg = nacl->se_tpg;
1377
1378 if (nacl->dynamic_node_acl)
1379 return 0;
1380
e3d6f909 1381 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1382 &nacl->acl_group.cg_item);
1383}
1384
1385static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1386{
1387 struct se_portal_group *tpg = nacl->se_tpg;
1388
1389 if (nacl->dynamic_node_acl) {
1390 atomic_dec(&nacl->acl_pr_ref_count);
1391 smp_mb__after_atomic_dec();
1392 return;
1393 }
1394
e3d6f909 1395 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1396 &nacl->acl_group.cg_item);
1397
1398 atomic_dec(&nacl->acl_pr_ref_count);
1399 smp_mb__after_atomic_dec();
1400}
1401
1402static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1403{
1404 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1405 struct se_node_acl *nacl;
1406 struct se_portal_group *tpg;
1407 /*
1408 * For nacl->dynamic_node_acl=1
1409 */
6708bb27 1410 if (!lun_acl)
c66ac9db
NB		 1411 return 0;
1412
1413 nacl = lun_acl->se_lun_nacl;
1414 tpg = nacl->se_tpg;
1415
e3d6f909 1416 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1417 &lun_acl->se_lun_group.cg_item);
1418}
1419
1420static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1421{
1422 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1423 struct se_node_acl *nacl;
1424 struct se_portal_group *tpg;
1425 /*
1426 * For nacl->dynamic_node_acl=1
1427 */
6708bb27 1428 if (!lun_acl) {
c66ac9db
NB		 1429 atomic_dec(&se_deve->pr_ref_count);
1430 smp_mb__after_atomic_dec();
1431 return;
1432 }
1433 nacl = lun_acl->se_lun_nacl;
1434 tpg = nacl->se_tpg;
1435
e3d6f909 1436 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
c66ac9db
NB		 1437 &lun_acl->se_lun_group.cg_item);
1438
1439 atomic_dec(&se_deve->pr_ref_count);
1440 smp_mb__after_atomic_dec();
1441}
1442
de103c93
CH		 1443static sense_reason_t
1444core_scsi3_decode_spec_i_port(
c66ac9db
NB		 1445 struct se_cmd *cmd,
1446 struct se_portal_group *tpg,
1447 unsigned char *l_isid,
1448 u64 sa_res_key,
1449 int all_tg_pt,
1450 int aptpl)
1451{
5951146d 1452 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1453 struct se_port *tmp_port;
1454 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
e3d6f909 1455 struct se_session *se_sess = cmd->se_sess;
c66ac9db
NB		 1456 struct se_node_acl *dest_node_acl = NULL;
1457 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1458 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1459 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
d0f474e5 1460 LIST_HEAD(tid_dest_list);
c66ac9db
NB		 1461 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1462 struct target_core_fabric_ops *tmp_tf_ops;
05d1c7c0 1463 unsigned char *buf;
c66ac9db
NB		 1464 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1465 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
de103c93 1466 sense_reason_t ret;
c66ac9db 1467 u32 tpdl, tid_len = 0;
de103c93 1468 int dest_local_nexus, prf_isid;
c66ac9db
NB		 1469 u32 dest_rtpi = 0;
1470
1471 memset(dest_iport, 0, 64);
c66ac9db 1472
f2083241 1473 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db
NB		 1474 /*
1475 * Allocate a struct pr_transport_id_holder and setup the
1476 * local_node_acl and local_se_deve pointers and add to
1477 * struct list_head tid_dest_list for add registration
1478 * processing in the loop of tid_dest_list below.
1479 */
1480 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
6708bb27
AG		 1481 if (!tidh_new) {
1482 pr_err("Unable to allocate tidh_new\n");
de103c93 1483 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1484 }
1485 INIT_LIST_HEAD(&tidh_new->dest_list);
1486 tidh_new->dest_tpg = tpg;
1487 tidh_new->dest_node_acl = se_sess->se_node_acl;
1488 tidh_new->dest_se_deve = local_se_deve;
1489
5951146d 1490 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1491 se_sess->se_node_acl, local_se_deve, l_isid,
1492 sa_res_key, all_tg_pt, aptpl);
6708bb27 1493 if (!local_pr_reg) {
c66ac9db 1494 kfree(tidh_new);
de103c93 1495 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 1496 }
1497 tidh_new->dest_pr_reg = local_pr_reg;
1498 /*
1499 * The local I_T nexus does not hold any configfs dependances,
1500 * so we set tid_h->dest_local_nexus=1 to prevent the
1501 * configfs_undepend_item() calls in the tid_dest_list loops below.
1502 */
1503 tidh_new->dest_local_nexus = 1;
1504 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
05d1c7c0 1505
0d7f1299
PB		 1506 if (cmd->data_length < 28) {
1507 pr_warn("SPC-PR: Received PR OUT parameter list"
1508 " length too small: %u\n", cmd->data_length);
de103c93 1509 ret = TCM_INVALID_PARAMETER_LIST;
0d7f1299
PB		 1510 goto out;
1511 }
1512
4949314c 1513 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 1514 if (!buf) {
1515 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1516 goto out;
1517 }
1518
c66ac9db
NB		 1519 /*
1520 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1521 * first extract TransportID Parameter Data Length, and make sure
1522 * the value matches up to the SCSI expected data transfer length.
1523 */
1524 tpdl = (buf[24] & 0xff) << 24;
1525 tpdl |= (buf[25] & 0xff) << 16;
1526 tpdl |= (buf[26] & 0xff) << 8;
1527 tpdl |= buf[27] & 0xff;
1528
1529 if ((tpdl + 28) != cmd->data_length) {
6708bb27 1530 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
c66ac9db
NB		 1531 " does not equal CDB data_length: %u\n", tpdl,
1532 cmd->data_length);
de103c93
CH		 1533 ret = TCM_INVALID_PARAMETER_LIST;
1534 goto out_unmap;
c66ac9db
NB		 1535 }
1536 /*
1537 * Start processing the received transport IDs using the
1538 * receiving I_T Nexus portal's fabric dependent methods to
1539 * obtain the SCSI Initiator Port/Device Identifiers.
1540 */
1541 ptr = &buf[28];
1542
1543 while (tpdl > 0) {
1544 proto_ident = (ptr[0] & 0x0f);
1545 dest_tpg = NULL;
1546
1547 spin_lock(&dev->se_port_lock);
1548 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1549 tmp_tpg = tmp_port->sep_tpg;
6708bb27 1550 if (!tmp_tpg)
c66ac9db 1551 continue;
e3d6f909 1552 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
6708bb27 1553 if (!tmp_tf_ops)
c66ac9db 1554 continue;
6708bb27
AG		 1555 if (!tmp_tf_ops->get_fabric_proto_ident ||
1556 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
c66ac9db
NB		 1557 continue;
1558 /*
1559 * Look for the matching proto_ident provided by
1560 * the received TransportID
1561 */
1562 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1563 if (tmp_proto_ident != proto_ident)
1564 continue;
1565 dest_rtpi = tmp_port->sep_rtpi;
1566
1567 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1568 tmp_tpg, (const char *)ptr, &tid_len,
1569 &iport_ptr);
6708bb27 1570 if (!i_str)
c66ac9db
NB		 1571 continue;
1572
1573 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1574 smp_mb__after_atomic_inc();
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
NB		 1579 " for tmp_tpg\n");
1580 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1581 smp_mb__after_atomic_dec();
de103c93
CH		 1582 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1583 goto out_unmap;
c66ac9db
NB		 1584 }
1585 /*
35d1efe8 1586 * Locate the destination initiator ACL to be registered
c66ac9db
NB		 1587 * from the decoded fabric module specific TransportID
1588 * at *i_str.
1589 */
28638887 1590 spin_lock_irq(&tmp_tpg->acl_node_lock);
c66ac9db
NB		 1591 dest_node_acl = __core_tpg_get_initiator_node_acl(
1592 tmp_tpg, i_str);
1593 if (dest_node_acl) {
1594 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1595 smp_mb__after_atomic_inc();
1596 }
28638887 1597 spin_unlock_irq(&tmp_tpg->acl_node_lock);
c66ac9db 1598
6708bb27 1599 if (!dest_node_acl) {
c66ac9db
NB		 1600 core_scsi3_tpg_undepend_item(tmp_tpg);
1601 spin_lock(&dev->se_port_lock);
1602 continue;
1603 }
1604
de103c93 1605 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 1606 pr_err("configfs_depend_item() failed"
c66ac9db
NB		 1607 " for dest_node_acl->acl_group\n");
1608 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1609 smp_mb__after_atomic_dec();
1610 core_scsi3_tpg_undepend_item(tmp_tpg);
de103c93
CH		 1611 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1612 goto out_unmap;
c66ac9db
NB		 1613 }
1614
1615 dest_tpg = tmp_tpg;
6708bb27 1616 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
c66ac9db 1617 " %s Port RTPI: %hu\n",
e3d6f909 1618 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1619 dest_node_acl->initiatorname, dest_rtpi);
1620
1621 spin_lock(&dev->se_port_lock);
1622 break;
1623 }
1624 spin_unlock(&dev->se_port_lock);
1625
6708bb27
AG		 1626 if (!dest_tpg) {
1627 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
c66ac9db 1628 " dest_tpg\n");
de103c93
CH		 1629 ret = TCM_INVALID_PARAMETER_LIST;
1630 goto out_unmap;
c66ac9db 1631 }
8b1e1244 1632
6708bb27 1633 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
c66ac9db 1634 " tid_len: %d for %s + %s\n",
e3d6f909 1635 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
c66ac9db 1636 tpdl, tid_len, i_str, iport_ptr);
8b1e1244 1637
c66ac9db 1638 if (tid_len > tpdl) {
6708bb27 1639 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
c66ac9db
NB		 1640 " %u for Transport ID: %s\n", tid_len, ptr);
1641 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1642 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1643 ret = TCM_INVALID_PARAMETER_LIST;
1644 goto out_unmap;
c66ac9db
NB		 1645 }
1646 /*
1647 * Locate the desintation struct se_dev_entry pointer for matching
1648 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1649 * Target Port.
1650 */
1651 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1652 dest_rtpi);
6708bb27
AG		 1653 if (!dest_se_deve) {
1654 pr_err("Unable to locate %s dest_se_deve"
c66ac9db 1655 " from destination RTPI: %hu\n",
e3d6f909 1656 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1657 dest_rtpi);
1658
1659 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1660 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1661 ret = TCM_INVALID_PARAMETER_LIST;
1662 goto out_unmap;
c66ac9db
NB		 1663 }
1664
de103c93 1665 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 1666 pr_err("core_scsi3_lunacl_depend_item()"
c66ac9db
NB		 1667 " failed\n");
1668 atomic_dec(&dest_se_deve->pr_ref_count);
1669 smp_mb__after_atomic_dec();
1670 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1671 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1672 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1673 goto out_unmap;
c66ac9db 1674 }
8b1e1244 1675
6708bb27 1676 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
c66ac9db 1677 " dest_se_deve mapped_lun: %u\n",
e3d6f909 1678 dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db 1679 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
8b1e1244 1680
c66ac9db
NB		 1681 /*
1682 * Skip any TransportIDs that already have a registration for
1683 * this target port.
1684 */
1685 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1686 iport_ptr);
1687 if (pr_reg_e) {
1688 core_scsi3_put_pr_reg(pr_reg_e);
1689 core_scsi3_lunacl_undepend_item(dest_se_deve);
1690 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1691 core_scsi3_tpg_undepend_item(dest_tpg);
1692 ptr += tid_len;
1693 tpdl -= tid_len;
1694 tid_len = 0;
1695 continue;
1696 }
1697 /*
1698 * Allocate a struct pr_transport_id_holder and setup
1699 * the dest_node_acl and dest_se_deve pointers for the
1700 * loop below.
1701 */
1702 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1703 GFP_KERNEL);
6708bb27
AG		 1704 if (!tidh_new) {
1705 pr_err("Unable to allocate tidh_new\n");
c66ac9db
NB		 1706 core_scsi3_lunacl_undepend_item(dest_se_deve);
1707 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1708 core_scsi3_tpg_undepend_item(dest_tpg);
de103c93
CH		 1709 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1710 goto out_unmap;
c66ac9db
NB		 1711 }
1712 INIT_LIST_HEAD(&tidh_new->dest_list);
1713 tidh_new->dest_tpg = dest_tpg;
1714 tidh_new->dest_node_acl = dest_node_acl;
1715 tidh_new->dest_se_deve = dest_se_deve;
1716
1717 /*
1718 * Allocate, but do NOT add the registration for the
1719 * TransportID referenced SCSI Initiator port. This
1720 * done because of the following from spc4r17 in section
1721 * 6.14.3 wrt SPEC_I_PT:
1722 *
1723 * "If a registration fails for any initiator port (e.g., if th
1724 * logical unit does not have enough resources available to
1725 * hold the registration information), no registrations shall be
1726 * made, and the command shall be terminated with
1727 * CHECK CONDITION status."
1728 *
1729 * That means we call __core_scsi3_alloc_registration() here,
1730 * and then call __core_scsi3_add_registration() in the
1731 * 2nd loop which will never fail.
1732 */
5951146d 1733 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 1734 dest_node_acl, dest_se_deve, iport_ptr,
1735 sa_res_key, all_tg_pt, aptpl);
6708bb27 1736 if (!dest_pr_reg) {
c66ac9db
NB		 1737 core_scsi3_lunacl_undepend_item(dest_se_deve);
1738 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1739 core_scsi3_tpg_undepend_item(dest_tpg);
1740 kfree(tidh_new);
de103c93
CH		 1741 ret = TCM_INVALID_PARAMETER_LIST;
1742 goto out_unmap;
c66ac9db
NB		 1743 }
1744 tidh_new->dest_pr_reg = dest_pr_reg;
1745 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1746
1747 ptr += tid_len;
1748 tpdl -= tid_len;
1749 tid_len = 0;
1750
1751 }
05d1c7c0 1752
4949314c 1753 transport_kunmap_data_sg(cmd);
05d1c7c0 1754
c66ac9db
NB		 1755 /*
1756 * Go ahead and create a registrations from tid_dest_list for the
1757 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1758 * and dest_se_deve.
1759 *
1760 * The SA Reservation Key from the PROUT is set for the
1761 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1762 * means that the TransportID Initiator port will be
1763 * registered on all of the target ports in the SCSI target device
1764 * ALL_TG_PT=0 means the registration will only be for the
1765 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1766 * was received.
1767 */
1768 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1769 dest_tpg = tidh->dest_tpg;
1770 dest_node_acl = tidh->dest_node_acl;
1771 dest_se_deve = tidh->dest_se_deve;
1772 dest_pr_reg = tidh->dest_pr_reg;
1773 dest_local_nexus = tidh->dest_local_nexus;
1774
1775 list_del(&tidh->dest_list);
1776 kfree(tidh);
1777
1778 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1779 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1780 PR_REG_ISID_ID_LEN);
1781
5951146d 1782 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
c66ac9db
NB		 1783 dest_pr_reg, 0, 0);
1784
6708bb27 1785 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
c66ac9db 1786 " registered Transport ID for Node: %s%s Mapped LUN:"
e3d6f909 1787 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1788 dest_node_acl->initiatorname, (prf_isid) ?
1789 &i_buf[0] : "", dest_se_deve->mapped_lun);
1790
1791 if (dest_local_nexus)
1792 continue;
1793
1794 core_scsi3_lunacl_undepend_item(dest_se_deve);
1795 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1796 core_scsi3_tpg_undepend_item(dest_tpg);
1797 }
1798
1799 return 0;
de103c93 1800out_unmap:
4949314c 1801 transport_kunmap_data_sg(cmd);
de103c93 1802out:
c66ac9db
NB		 1803 /*
1804 * For the failure case, release everything from tid_dest_list
1805 * including *dest_pr_reg and the configfs dependances..
1806 */
1807 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1808 dest_tpg = tidh->dest_tpg;
1809 dest_node_acl = tidh->dest_node_acl;
1810 dest_se_deve = tidh->dest_se_deve;
1811 dest_pr_reg = tidh->dest_pr_reg;
1812 dest_local_nexus = tidh->dest_local_nexus;
1813
1814 list_del(&tidh->dest_list);
1815 kfree(tidh);
1816 /*
1817 * Release any extra ALL_TG_PT=1 registrations for
1818 * the SPEC_I_PT=1 case.
1819 */
1820 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1821 &dest_pr_reg->pr_reg_atp_list,
1822 pr_reg_atp_mem_list) {
1823 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1824 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1825 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1826 }
1827
1828 kfree(dest_pr_reg->pr_aptpl_buf);
1829 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1830
1831 if (dest_local_nexus)
1832 continue;
1833
1834 core_scsi3_lunacl_undepend_item(dest_se_deve);
1835 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1836 core_scsi3_tpg_undepend_item(dest_tpg);
1837 }
1838 return ret;
1839}
1840
1841/*
1842 * Called with struct se_device->dev_reservation_lock held
1843 */
1844static int __core_scsi3_update_aptpl_buf(
1845 struct se_device *dev,
1846 unsigned char *buf,
1847 u32 pr_aptpl_buf_len,
1848 int clear_aptpl_metadata)
1849{
1850 struct se_lun *lun;
1851 struct se_portal_group *tpg;
c66ac9db
NB		 1852 struct t10_pr_registration *pr_reg;
1853 unsigned char tmp[512], isid_buf[32];
1854 ssize_t len = 0;
1855 int reg_count = 0;
1856
1857 memset(buf, 0, pr_aptpl_buf_len);
1858 /*
1859 * Called to clear metadata once APTPL has been deactivated.
1860 */
1861 if (clear_aptpl_metadata) {
1862 snprintf(buf, pr_aptpl_buf_len,
1863 "No Registrations or Reservations\n");
1864 return 0;
1865 }
1866 /*
1867 * Walk the registration list..
1868 */
0fd97ccf
CH		 1869 spin_lock(&dev->t10_pr.registration_lock);
1870 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 1871 pr_reg_list) {
1872
1873 tmp[0] = '\0';
1874 isid_buf[0] = '\0';
1875 tpg = pr_reg->pr_reg_nacl->se_tpg;
1876 lun = pr_reg->pr_reg_tg_pt_lun;
1877 /*
1878 * Write out any ISID value to APTPL metadata that was included
1879 * in the original registration.
1880 */
1881 if (pr_reg->isid_present_at_reg)
1882 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1883 pr_reg->pr_reg_isid);
1884 /*
1885 * Include special metadata if the pr_reg matches the
1886 * reservation holder.
1887 */
1888 if (dev->dev_pr_res_holder == pr_reg) {
1889 snprintf(tmp, 512, "PR_REG_START: %d"
1890 "\ninitiator_fabric=%s\n"
1891 "initiator_node=%s\n%s"
1892 "sa_res_key=%llu\n"
1893 "res_holder=1\nres_type=%02x\n"
1894 "res_scope=%02x\nres_all_tg_pt=%d\n"
1895 "mapped_lun=%u\n", reg_count,
e3d6f909 1896 tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1897 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1898 pr_reg->pr_res_key, pr_reg->pr_res_type,
1899 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1900 pr_reg->pr_res_mapped_lun);
1901 } else {
1902 snprintf(tmp, 512, "PR_REG_START: %d\n"
1903 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1904 "sa_res_key=%llu\nres_holder=0\n"
1905 "res_all_tg_pt=%d\nmapped_lun=%u\n",
e3d6f909 1906 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 1907 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1908 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1909 pr_reg->pr_res_mapped_lun);
1910 }
1911
60d645a4 1912 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1913 pr_err("Unable to update renaming"
c66ac9db 1914 " APTPL metadata\n");
0fd97ccf 1915 spin_unlock(&dev->t10_pr.registration_lock);
e3d6f909 1916 return -EMSGSIZE;
c66ac9db
NB		 1917 }
1918 len += sprintf(buf+len, "%s", tmp);
1919
1920 /*
1921 * Include information about the associated SCSI target port.
1922 */
1923 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1924 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
e3d6f909
AG		 1925 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1926 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1927 tpg->se_tpg_tfo->tpg_get_tag(tpg),
c66ac9db
NB		 1928 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1929
60d645a4 1930 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
6708bb27 1931 pr_err("Unable to update renaming"
c66ac9db 1932 " APTPL metadata\n");
0fd97ccf 1933 spin_unlock(&dev->t10_pr.registration_lock);
e3d6f909 1934 return -EMSGSIZE;
c66ac9db
NB		 1935 }
1936 len += sprintf(buf+len, "%s", tmp);
1937 reg_count++;
1938 }
0fd97ccf 1939 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db 1940
6708bb27 1941 if (!reg_count)
c66ac9db
NB		 1942 len += sprintf(buf+len, "No Registrations or Reservations");
1943
1944 return 0;
1945}
1946
1947static int core_scsi3_update_aptpl_buf(
1948 struct se_device *dev,
1949 unsigned char *buf,
1950 u32 pr_aptpl_buf_len,
1951 int clear_aptpl_metadata)
1952{
1953 int ret;
1954
1955 spin_lock(&dev->dev_reservation_lock);
1956 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1957 clear_aptpl_metadata);
1958 spin_unlock(&dev->dev_reservation_lock);
1959
1960 return ret;
1961}
1962
1963/*
1964 * Called with struct se_device->aptpl_file_mutex held
1965 */
1966static int __core_scsi3_write_aptpl_to_file(
1967 struct se_device *dev,
1968 unsigned char *buf,
1969 u32 pr_aptpl_buf_len)
1970{
0fd97ccf 1971 struct t10_wwn *wwn = &dev->t10_wwn;
c66ac9db 1972 struct file *file;
c66ac9db
NB		 1973 int flags = O_RDWR | O_CREAT | O_TRUNC;
1974 char path[512];
1975 int ret;
1976
c66ac9db
NB		 1977 memset(path, 0, 512);
1978
60d645a4 1979 if (strlen(&wwn->unit_serial[0]) >= 512) {
6708bb27 1980 pr_err("WWN value for struct se_device does not fit"
c66ac9db 1981 " into path buffer\n");
e3d6f909 1982 return -EMSGSIZE;
c66ac9db
NB		 1983 }
1984
1985 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1986 file = filp_open(path, flags, 0600);
0e9b10a9 1987 if (IS_ERR(file)) {
6708bb27 1988 pr_err("filp_open(%s) for APTPL metadata"
c66ac9db 1989 " failed\n", path);
0e9b10a9 1990 return PTR_ERR(file);
c66ac9db
NB		 1991 }
1992
6708bb27 1993 if (!pr_aptpl_buf_len)
0e9b10a9 1994 pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
c66ac9db 1995
0e9b10a9 1996 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
c66ac9db 1997
0e9b10a9 1998 if (ret < 0)
6708bb27 1999 pr_debug("Error writing APTPL metadata file: %s\n", path);
0e9b10a9 2000 fput(file);
c66ac9db 2001
e041da06 2002 return (ret < 0) ? -EIO : 0;
c66ac9db
NB		 2003}
2004
de103c93
CH		 2005static int
2006core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf,
2007 u32 in_pr_aptpl_buf_len)
c66ac9db
NB		 2008{
2009 unsigned char null_buf[64], *buf;
2010 u32 pr_aptpl_buf_len;
de103c93
CH		 2011 int clear_aptpl_metadata = 0;
2012 int ret;
2013
c66ac9db
NB		 2014 /*
2015 * Can be called with a NULL pointer from PROUT service action CLEAR
2016 */
6708bb27 2017 if (!in_buf) {
c66ac9db
NB		 2018 memset(null_buf, 0, 64);
2019 buf = &null_buf[0];
2020 /*
2021 * This will clear the APTPL metadata to:
2022 * "No Registrations or Reservations" status
2023 */
2024 pr_aptpl_buf_len = 64;
2025 clear_aptpl_metadata = 1;
2026 } else {
2027 buf = in_buf;
2028 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2029 }
2030
2031 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2032 clear_aptpl_metadata);
2033 if (ret != 0)
e3d6f909 2034 return ret;
de103c93 2035
c66ac9db
NB		 2036 /*
2037 * __core_scsi3_write_aptpl_to_file() will call strlen()
2038 * on the passed buf to determine pr_aptpl_buf_len.
2039 */
de103c93 2040 return __core_scsi3_write_aptpl_to_file(dev, buf, 0);
c66ac9db
NB		 2041}
2042
de103c93
CH		 2043static sense_reason_t
2044core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2045 int aptpl, int all_tg_pt, int spec_i_pt, int ignore_key)
c66ac9db 2046{
e3d6f909 2047 struct se_session *se_sess = cmd->se_sess;
5951146d 2048 struct se_device *dev = cmd->se_dev;
c66ac9db 2049 struct se_dev_entry *se_deve;
e3d6f909 2050 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 2051 struct se_portal_group *se_tpg;
2052 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
0fd97ccf 2053 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2054 /* Used for APTPL metadata w/ UNREGISTER */
2055 unsigned char *pr_aptpl_buf = NULL;
2056 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
a0d50f62 2057 sense_reason_t ret = TCM_NO_SENSE;
de103c93 2058 int pr_holder = 0, type;
c66ac9db 2059
6708bb27
AG		 2060 if (!se_sess || !se_lun) {
2061 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2062 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2063 }
2064 se_tpg = se_sess->se_tpg;
f2083241 2065 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
c66ac9db 2066
e3d6f909 2067 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
c66ac9db 2068 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 2069 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
c66ac9db
NB		 2070 PR_REG_ISID_LEN);
2071 isid_ptr = &isid_buf[0];
2072 }
2073 /*
2074 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2075 */
2076 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27 2077 if (!pr_reg_e) {
c66ac9db 2078 if (res_key) {
6708bb27 2079 pr_warn("SPC-3 PR: Reservation Key non-zero"
c66ac9db 2080 " for SA REGISTER, returning CONFLICT\n");
de103c93 2081 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2082 }
2083 /*
2084 * Do nothing but return GOOD status.
2085 */
6708bb27 2086 if (!sa_res_key)
03e98c9e 2087 return 0;
c66ac9db 2088
6708bb27 2089 if (!spec_i_pt) {
c66ac9db
NB		 2090 /*
2091 * Perform the Service Action REGISTER on the Initiator
2092 * Port Endpoint that the PRO was received from on the
2093 * Logical Unit of the SCSI device server.
2094 */
de103c93 2095 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db
NB		 2096 se_sess->se_node_acl, se_deve, isid_ptr,
2097 sa_res_key, all_tg_pt, aptpl,
de103c93 2098 ignore_key, 0)) {
6708bb27 2099 pr_err("Unable to allocate"
c66ac9db 2100 " struct t10_pr_registration\n");
de103c93 2101 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2102 }
2103 } else {
2104 /*
2105 * Register both the Initiator port that received
2106 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2107 * TransportID from Parameter list and loop through
2108 * fabric dependent parameter list while calling
2109 * logic from of core_scsi3_alloc_registration() for
2110 * each TransportID provided SCSI Initiator Port/Device
2111 */
2112 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2113 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2114 if (ret != 0)
2115 return ret;
2116 }
2117 /*
2118 * Nothing left to do for the APTPL=0 case.
2119 */
6708bb27 2120 if (!aptpl) {
c66ac9db 2121 pr_tmpl->pr_aptpl_active = 0;
5951146d 2122 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 2123 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
c66ac9db
NB		 2124 " REGISTER\n");
2125 return 0;
2126 }
2127 /*
2128 * Locate the newly allocated local I_T Nexus *pr_reg, and
2129 * update the APTPL metadata information using its
2130 * preallocated *pr_reg->pr_aptpl_buf.
2131 */
5951146d 2132 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db
NB		 2133 se_sess->se_node_acl, se_sess);
2134
de103c93 2135 if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
c66ac9db 2136 &pr_reg->pr_aptpl_buf[0],
de103c93 2137 pr_tmpl->pr_aptpl_buf_len)) {
c66ac9db 2138 pr_tmpl->pr_aptpl_active = 1;
6708bb27 2139 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
c66ac9db
NB		 2140 }
2141
de103c93
CH		 2142 goto out_put_pr_reg;
2143 }
2144
2145 /*
2146 * Locate the existing *pr_reg via struct se_node_acl pointers
2147 */
2148 pr_reg = pr_reg_e;
2149 type = pr_reg->pr_res_type;
2150
2151 if (!ignore_key) {
2152 if (res_key != pr_reg->pr_res_key) {
2153 pr_err("SPC-3 PR REGISTER: Received"
2154 " res_key: 0x%016Lx does not match"
2155 " existing SA REGISTER res_key:"
2156 " 0x%016Lx\n", res_key,
2157 pr_reg->pr_res_key);
2158 ret = TCM_RESERVATION_CONFLICT;
2159 goto out_put_pr_reg;
c66ac9db 2160 }
de103c93
CH		 2161 }
2162
2163 if (spec_i_pt) {
2164 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2165 " set while sa_res_key=0\n");
2166 ret = TCM_INVALID_PARAMETER_LIST;
2167 goto out_put_pr_reg;
2168 }
2169
2170 /*
2171 * An existing ALL_TG_PT=1 registration being released
2172 * must also set ALL_TG_PT=1 in the incoming PROUT.
2173 */
2174 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2175 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2176 " registration exists, but ALL_TG_PT=1 bit not"
2177 " present in received PROUT\n");
2178 ret = TCM_INVALID_CDB_FIELD;
2179 goto out_put_pr_reg;
2180 }
2181
2182 /*
2183 * Allocate APTPL metadata buffer used for UNREGISTER ops
2184 */
2185 if (aptpl) {
2186 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2187 GFP_KERNEL);
2188 if (!pr_aptpl_buf) {
2189 pr_err("Unable to allocate"
2190 " pr_aptpl_buf\n");
2191 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2192 goto out_put_pr_reg;
c66ac9db 2193 }
de103c93
CH		 2194 }
2195
2196 /*
2197 * sa_res_key=0 Unregister Reservation Key for registered I_T
2198 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2199 * Nexus.
2200 */
2201 if (!sa_res_key) {
2202 pr_holder = core_scsi3_check_implict_release(
2203 cmd->se_dev, pr_reg);
2204 if (pr_holder < 0) {
2205 kfree(pr_aptpl_buf);
2206 ret = TCM_RESERVATION_CONFLICT;
2207 goto out_put_pr_reg;
c66ac9db 2208 }
de103c93
CH		 2209
2210 spin_lock(&pr_tmpl->registration_lock);
c66ac9db 2211 /*
de103c93
CH		 2212 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2213 * and matching pr_res_key.
c66ac9db 2214 */
de103c93
CH		 2215 if (pr_reg->pr_reg_all_tg_pt) {
2216 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2217 &pr_tmpl->registration_list,
2218 pr_reg_list) {
2219
2220 if (!pr_reg_p->pr_reg_all_tg_pt)
2221 continue;
2222 if (pr_reg_p->pr_res_key != res_key)
2223 continue;
2224 if (pr_reg == pr_reg_p)
2225 continue;
2226 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2227 pr_reg_p->pr_reg_nacl->initiatorname))
2228 continue;
2229
2230 __core_scsi3_free_registration(dev,
2231 pr_reg_p, NULL, 0);
c66ac9db
NB		 2232 }
2233 }
de103c93 2234
c66ac9db 2235 /*
de103c93 2236 * Release the calling I_T Nexus registration now..
c66ac9db 2237 */
de103c93 2238 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
c66ac9db 2239
de103c93
CH		 2240 /*
2241 * From spc4r17, section 5.7.11.3 Unregistering
2242 *
2243 * If the persistent reservation is a registrants only
2244 * type, the device server shall establish a unit
2245 * attention condition for the initiator port associated
2246 * with every registered I_T nexus except for the I_T
2247 * nexus on which the PERSISTENT RESERVE OUT command was
2248 * received, with the additional sense code set to
2249 * RESERVATIONS RELEASED.
2250 */
2251 if (pr_holder &&
2252 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2253 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2254 list_for_each_entry(pr_reg_p,
2255 &pr_tmpl->registration_list,
2256 pr_reg_list) {
2257
2258 core_scsi3_ua_allocate(
2259 pr_reg_p->pr_reg_nacl,
2260 pr_reg_p->pr_res_mapped_lun,
2261 0x2A,
2262 ASCQ_2AH_RESERVATIONS_RELEASED);
c66ac9db 2263 }
de103c93
CH		 2264 }
2265 spin_unlock(&pr_tmpl->registration_lock);
c66ac9db 2266
de103c93
CH		 2267 if (!aptpl) {
2268 pr_tmpl->pr_aptpl_active = 0;
2269 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2270 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2271 " for UNREGISTER\n");
2272 return 0;
2273 }
c66ac9db 2274
de103c93
CH		 2275 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2276 pr_tmpl->pr_aptpl_buf_len)) {
2277 pr_tmpl->pr_aptpl_active = 1;
2278 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2279 " for UNREGISTER\n");
2280 }
c66ac9db 2281
de103c93
CH		 2282 goto out_free_aptpl_buf;
2283 }
c66ac9db 2284
de103c93
CH		 2285 /*
2286 * Increment PRgeneration counter for struct se_device"
2287 * upon a successful REGISTER, see spc4r17 section 6.3.2
2288 * READ_KEYS service action.
2289 */
2290 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2291 pr_reg->pr_res_key = sa_res_key;
2292 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2293 " Key for %s to: 0x%016Lx PRgeneration:"
2294 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2295 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2296 pr_reg->pr_reg_nacl->initiatorname,
2297 pr_reg->pr_res_key, pr_reg->pr_res_generation);
c66ac9db 2298
de103c93
CH		 2299 if (!aptpl) {
2300 pr_tmpl->pr_aptpl_active = 0;
2301 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2302 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2303 " for REGISTER\n");
2304 ret = 0;
2305 goto out_put_pr_reg;
c66ac9db 2306 }
de103c93
CH		 2307
2308 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2309 pr_tmpl->pr_aptpl_buf_len)) {
2310 pr_tmpl->pr_aptpl_active = 1;
2311 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2312 " for REGISTER\n");
2313 }
2314
2315out_free_aptpl_buf:
2316 kfree(pr_aptpl_buf);
2317 ret = 0;
2318out_put_pr_reg:
2319 core_scsi3_put_pr_reg(pr_reg);
2320 return ret;
c66ac9db
NB		 2321}
2322
2323unsigned char *core_scsi3_pr_dump_type(int type)
2324{
2325 switch (type) {
2326 case PR_TYPE_WRITE_EXCLUSIVE:
2327 return "Write Exclusive Access";
2328 case PR_TYPE_EXCLUSIVE_ACCESS:
2329 return "Exclusive Access";
2330 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2331 return "Write Exclusive Access, Registrants Only";
2332 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2333 return "Exclusive Access, Registrants Only";
2334 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2335 return "Write Exclusive Access, All Registrants";
2336 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2337 return "Exclusive Access, All Registrants";
2338 default:
2339 break;
2340 }
2341
2342 return "Unknown SPC-3 PR Type";
2343}
2344
de103c93
CH		 2345static sense_reason_t
2346core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
c66ac9db 2347{
de103c93 2348 struct se_device *dev = cmd->se_dev;
e3d6f909 2349 struct se_session *se_sess = cmd->se_sess;
e3d6f909 2350 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2351 struct t10_pr_registration *pr_reg, *pr_res_holder;
0fd97ccf 2352 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db 2353 char i_buf[PR_REG_ISID_ID_LEN];
de103c93
CH		 2354 sense_reason_t ret;
2355 int prf_isid;
c66ac9db
NB		 2356
2357 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2358
6708bb27
AG		 2359 if (!se_sess || !se_lun) {
2360 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2361 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2362 }
c66ac9db
NB		 2363 /*
2364 * Locate the existing *pr_reg via struct se_node_acl pointers
2365 */
5951146d 2366 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2367 se_sess);
6708bb27
AG		 2368 if (!pr_reg) {
2369 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2370 " PR_REGISTERED *pr_reg for RESERVE\n");
de103c93 2371 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2372 }
2373 /*
2374 * From spc4r17 Section 5.7.9: Reserving:
2375 *
2376 * An application client creates a persistent reservation by issuing
2377 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2378 * a registered I_T nexus with the following parameters:
2379 * a) RESERVATION KEY set to the value of the reservation key that is
2380 * registered with the logical unit for the I_T nexus; and
2381 */
2382 if (res_key != pr_reg->pr_res_key) {
6708bb27 2383 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2384 " does not match existing SA REGISTER res_key:"
2385 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 2386 ret = TCM_RESERVATION_CONFLICT;
2387 goto out_put_pr_reg;
c66ac9db
NB		 2388 }
2389 /*
2390 * From spc4r17 Section 5.7.9: Reserving:
2391 *
2392 * From above:
2393 * b) TYPE field and SCOPE field set to the persistent reservation
2394 * being created.
2395 *
2396 * Only one persistent reservation is allowed at a time per logical unit
2397 * and that persistent reservation has a scope of LU_SCOPE.
2398 */
2399 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2400 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
de103c93
CH		 2401 ret = TCM_INVALID_PARAMETER_LIST;
2402 goto out_put_pr_reg;
c66ac9db
NB		 2403 }
2404 /*
2405 * See if we have an existing PR reservation holder pointer at
2406 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2407 * *pr_res_holder.
2408 */
2409 spin_lock(&dev->dev_reservation_lock);
2410 pr_res_holder = dev->dev_pr_res_holder;
ee1b1b9c 2411 if (pr_res_holder) {
5e15feee 2412 int pr_res_type = pr_res_holder->pr_res_type;
c66ac9db
NB		 2413 /*
2414 * From spc4r17 Section 5.7.9: Reserving:
2415 *
2416 * If the device server receives a PERSISTENT RESERVE OUT
2417 * command from an I_T nexus other than a persistent reservation
2418 * holder (see 5.7.10) that attempts to create a persistent
2419 * reservation when a persistent reservation already exists for
2420 * the logical unit, then the command shall be completed with
2421 * RESERVATION CONFLICT status.
2422 */
5e15feee
NB		 2423 if ((pr_res_holder != pr_reg) &&
2424 (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2425 (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
c66ac9db 2426 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2427 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2428 " [%s]: %s while reservation already held by"
2429 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2430 cmd->se_tfo->get_fabric_name(),
c66ac9db 2431 se_sess->se_node_acl->initiatorname,
e3d6f909 2432 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2433 pr_res_holder->pr_reg_nacl->initiatorname);
2434
2435 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2436 ret = TCM_RESERVATION_CONFLICT;
2437 goto out_put_pr_reg;
c66ac9db
NB		 2438 }
2439 /*
2440 * From spc4r17 Section 5.7.9: Reserving:
2441 *
2442 * If a persistent reservation holder attempts to modify the
2443 * type or scope of an existing persistent reservation, the
2444 * command shall be completed with RESERVATION CONFLICT status.
2445 */
2446 if ((pr_res_holder->pr_res_type != type) ||
2447 (pr_res_holder->pr_res_scope != scope)) {
2448 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2449 pr_err("SPC-3 PR: Attempted RESERVE from"
c66ac9db
NB		 2450 " [%s]: %s trying to change TYPE and/or SCOPE,"
2451 " while reservation already held by [%s]: %s,"
2452 " returning RESERVATION_CONFLICT\n",
e3d6f909 2453 cmd->se_tfo->get_fabric_name(),
c66ac9db 2454 se_sess->se_node_acl->initiatorname,
e3d6f909 2455 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2456 pr_res_holder->pr_reg_nacl->initiatorname);
2457
2458 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2459 ret = TCM_RESERVATION_CONFLICT;
2460 goto out_put_pr_reg;
c66ac9db
NB		 2461 }
2462 /*
2463 * From spc4r17 Section 5.7.9: Reserving:
2464 *
2465 * If the device server receives a PERSISTENT RESERVE OUT
2466 * command with RESERVE service action where the TYPE field and
2467 * the SCOPE field contain the same values as the existing type
2468 * and scope from a persistent reservation holder, it shall not
2469 * make any change to the existing persistent reservation and
2470 * shall completethe command with GOOD status.
2471 */
2472 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2473 ret = 0;
2474 goto out_put_pr_reg;
c66ac9db
NB		 2475 }
2476 /*
2477 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2478 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2479 */
2480 pr_reg->pr_res_scope = scope;
2481 pr_reg->pr_res_type = type;
2482 pr_reg->pr_res_holder = 1;
2483 dev->dev_pr_res_holder = pr_reg;
2484 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2485 PR_REG_ISID_ID_LEN);
2486
6708bb27 2487 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
c66ac9db 2488 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
e3d6f909 2489 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
c66ac9db 2490 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2491 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
e3d6f909 2492 cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 2493 se_sess->se_node_acl->initiatorname,
2494 (prf_isid) ? &i_buf[0] : "");
2495 spin_unlock(&dev->dev_reservation_lock);
2496
2497 if (pr_tmpl->pr_aptpl_active) {
de103c93 2498 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
c66ac9db 2499 &pr_reg->pr_aptpl_buf[0],
de103c93 2500 pr_tmpl->pr_aptpl_buf_len)) {
6708bb27 2501 pr_debug("SPC-3 PR: Updated APTPL metadata"
c66ac9db 2502 " for RESERVE\n");
de103c93 2503 }
c66ac9db
NB		 2504 }
2505
de103c93
CH		 2506 ret = 0;
2507out_put_pr_reg:
c66ac9db 2508 core_scsi3_put_pr_reg(pr_reg);
de103c93 2509 return ret;
c66ac9db
NB		 2510}
2511
de103c93
CH		 2512static sense_reason_t
2513core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2514 u64 res_key)
c66ac9db 2515{
c66ac9db
NB		 2516 switch (type) {
2517 case PR_TYPE_WRITE_EXCLUSIVE:
2518 case PR_TYPE_EXCLUSIVE_ACCESS:
2519 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2520 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2521 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2522 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93 2523 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
c66ac9db 2524 default:
6708bb27 2525 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
c66ac9db 2526 " 0x%02x\n", type);
de103c93 2527 return TCM_INVALID_CDB_FIELD;
c66ac9db 2528 }
c66ac9db
NB		 2529}
2530
2531/*
2532 * Called with struct se_device->dev_reservation_lock held.
2533 */
2534static void __core_scsi3_complete_pro_release(
2535 struct se_device *dev,
2536 struct se_node_acl *se_nacl,
2537 struct t10_pr_registration *pr_reg,
2538 int explict)
2539{
2540 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2541 char i_buf[PR_REG_ISID_ID_LEN];
2542 int prf_isid;
2543
2544 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2545 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2546 PR_REG_ISID_ID_LEN);
2547 /*
2548 * Go ahead and release the current PR reservation holder.
2549 */
2550 dev->dev_pr_res_holder = NULL;
2551
6708bb27 2552 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
c66ac9db
NB		 2553 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2554 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2555 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2556 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2557 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
c66ac9db
NB		 2558 tfo->get_fabric_name(), se_nacl->initiatorname,
2559 (prf_isid) ? &i_buf[0] : "");
2560 /*
2561 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2562 */
2563 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2564}
2565
de103c93
CH		 2566static sense_reason_t
2567core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2568 u64 res_key)
c66ac9db
NB		 2569{
2570 struct se_device *dev = cmd->se_dev;
e3d6f909
AG		 2571 struct se_session *se_sess = cmd->se_sess;
2572 struct se_lun *se_lun = cmd->se_lun;
c66ac9db 2573 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
0fd97ccf 2574 struct t10_reservation *pr_tmpl = &dev->t10_pr;
de103c93
CH		 2575 int all_reg = 0;
2576 sense_reason_t ret = 0;
c66ac9db 2577
6708bb27
AG		 2578 if (!se_sess || !se_lun) {
2579 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 2580 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2581 }
2582 /*
2583 * Locate the existing *pr_reg via struct se_node_acl pointers
2584 */
2585 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
6708bb27
AG		 2586 if (!pr_reg) {
2587 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2588 " PR_REGISTERED *pr_reg for RELEASE\n");
de103c93 2589 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2590 }
2591 /*
2592 * From spc4r17 Section 5.7.11.2 Releasing:
2593 *
2594 * If there is no persistent reservation or in response to a persistent
2595 * reservation release request from a registered I_T nexus that is not a
2596 * persistent reservation holder (see 5.7.10), the device server shall
2597 * do the following:
2598 *
2599 * a) Not release the persistent reservation, if any;
2600 * b) Not remove any registrations; and
2601 * c) Complete the command with GOOD status.
2602 */
2603 spin_lock(&dev->dev_reservation_lock);
2604 pr_res_holder = dev->dev_pr_res_holder;
6708bb27 2605 if (!pr_res_holder) {
c66ac9db
NB		 2606 /*
2607 * No persistent reservation, return GOOD status.
2608 */
2609 spin_unlock(&dev->dev_reservation_lock);
bb7a8c8e 2610 goto out_put_pr_reg;
c66ac9db
NB		 2611 }
2612 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2613 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2614 all_reg = 1;
2615
2616 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2617 /*
2618 * Non 'All Registrants' PR Type cases..
2619 * Release request from a registered I_T nexus that is not a
2620 * persistent reservation holder. return GOOD status.
2621 */
2622 spin_unlock(&dev->dev_reservation_lock);
de103c93 2623 goto out_put_pr_reg;
c66ac9db 2624 }
de103c93 2625
c66ac9db
NB		 2626 /*
2627 * From spc4r17 Section 5.7.11.2 Releasing:
2628 *
2629 * Only the persistent reservation holder (see 5.7.10) is allowed to
2630 * release a persistent reservation.
2631 *
2632 * An application client releases the persistent reservation by issuing
2633 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2634 * an I_T nexus that is a persistent reservation holder with the
2635 * following parameters:
2636 *
2637 * a) RESERVATION KEY field set to the value of the reservation key
2638 * that is registered with the logical unit for the I_T nexus;
2639 */
2640 if (res_key != pr_reg->pr_res_key) {
6708bb27 2641 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
c66ac9db
NB		 2642 " does not match existing SA REGISTER res_key:"
2643 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2644 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2645 ret = TCM_RESERVATION_CONFLICT;
2646 goto out_put_pr_reg;
c66ac9db
NB		 2647 }
2648 /*
2649 * From spc4r17 Section 5.7.11.2 Releasing and above:
2650 *
2651 * b) TYPE field and SCOPE field set to match the persistent
2652 * reservation being released.
2653 */
2654 if ((pr_res_holder->pr_res_type != type) ||
2655 (pr_res_holder->pr_res_scope != scope)) {
2656 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
6708bb27 2657 pr_err("SPC-3 PR RELEASE: Attempted to release"
c66ac9db
NB		 2658 " reservation from [%s]: %s with different TYPE "
2659 "and/or SCOPE while reservation already held by"
2660 " [%s]: %s, returning RESERVATION_CONFLICT\n",
e3d6f909 2661 cmd->se_tfo->get_fabric_name(),
c66ac9db 2662 se_sess->se_node_acl->initiatorname,
e3d6f909 2663 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db
NB		 2664 pr_res_holder->pr_reg_nacl->initiatorname);
2665
2666 spin_unlock(&dev->dev_reservation_lock);
de103c93
CH		 2667 ret = TCM_RESERVATION_CONFLICT;
2668 goto out_put_pr_reg;
c66ac9db
NB		 2669 }
2670 /*
2671 * In response to a persistent reservation release request from the
2672 * persistent reservation holder the device server shall perform a
2673 * release by doing the following as an uninterrupted series of actions:
2674 * a) Release the persistent reservation;
2675 * b) Not remove any registration(s);
2676 * c) If the released persistent reservation is a registrants only type
2677 * or all registrants type persistent reservation,
2678 * the device server shall establish a unit attention condition for
2679 * the initiator port associated with every regis-
2680 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2681 * RESERVE OUT command with RELEASE service action was received,
2682 * with the additional sense code set to RESERVATIONS RELEASED; and
2683 * d) If the persistent reservation is of any other type, the device
2684 * server shall not establish a unit attention condition.
2685 */
2686 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2687 pr_reg, 1);
2688
2689 spin_unlock(&dev->dev_reservation_lock);
2690
2691 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2692 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2693 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2694 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2695 /*
2696 * If no UNIT ATTENTION conditions will be established for
2697 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2698 * go ahead and check for APTPL=1 update+write below
2699 */
2700 goto write_aptpl;
2701 }
2702
2703 spin_lock(&pr_tmpl->registration_lock);
2704 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2705 pr_reg_list) {
2706 /*
2707 * Do not establish a UNIT ATTENTION condition
2708 * for the calling I_T Nexus
2709 */
2710 if (pr_reg_p == pr_reg)
2711 continue;
2712
2713 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2714 pr_reg_p->pr_res_mapped_lun,
2715 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2716 }
2717 spin_unlock(&pr_tmpl->registration_lock);
2718
2719write_aptpl:
2720 if (pr_tmpl->pr_aptpl_active) {
de103c93
CH		 2721 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2722 &pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) {
6708bb27 2723 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
de103c93 2724 }
c66ac9db 2725 }
de103c93 2726out_put_pr_reg:
c66ac9db 2727 core_scsi3_put_pr_reg(pr_reg);
de103c93 2728 return ret;
c66ac9db
NB		 2729}
2730
de103c93
CH		 2731static sense_reason_t
2732core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
c66ac9db
NB		 2733{
2734 struct se_device *dev = cmd->se_dev;
2735 struct se_node_acl *pr_reg_nacl;
e3d6f909 2736 struct se_session *se_sess = cmd->se_sess;
0fd97ccf 2737 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2738 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2739 u32 pr_res_mapped_lun = 0;
2740 int calling_it_nexus = 0;
2741 /*
2742 * Locate the existing *pr_reg via struct se_node_acl pointers
2743 */
5951146d 2744 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
c66ac9db 2745 se_sess->se_node_acl, se_sess);
6708bb27
AG		 2746 if (!pr_reg_n) {
2747 pr_err("SPC-3 PR: Unable to locate"
c66ac9db 2748 " PR_REGISTERED *pr_reg for CLEAR\n");
de103c93 2749 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 2750 }
2751 /*
2752 * From spc4r17 section 5.7.11.6, Clearing:
2753 *
2754 * Any application client may release the persistent reservation and
2755 * remove all registrations from a device server by issuing a
2756 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2757 * registered I_T nexus with the following parameter:
2758 *
2759 * a) RESERVATION KEY field set to the value of the reservation key
2760 * that is registered with the logical unit for the I_T nexus.
2761 */
2762 if (res_key != pr_reg_n->pr_res_key) {
6708bb27 2763 pr_err("SPC-3 PR REGISTER: Received"
c66ac9db
NB		 2764 " res_key: 0x%016Lx does not match"
2765 " existing SA REGISTER res_key:"
2766 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2767 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2768 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2769 }
2770 /*
2771 * a) Release the persistent reservation, if any;
2772 */
2773 spin_lock(&dev->dev_reservation_lock);
2774 pr_res_holder = dev->dev_pr_res_holder;
2775 if (pr_res_holder) {
2776 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2777 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2778 pr_res_holder, 0);
2779 }
2780 spin_unlock(&dev->dev_reservation_lock);
2781 /*
2782 * b) Remove all registration(s) (see spc4r17 5.7.7);
2783 */
2784 spin_lock(&pr_tmpl->registration_lock);
2785 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2786 &pr_tmpl->registration_list, pr_reg_list) {
2787
2788 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2789 pr_reg_nacl = pr_reg->pr_reg_nacl;
2790 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2791 __core_scsi3_free_registration(dev, pr_reg, NULL,
2792 calling_it_nexus);
2793 /*
2794 * e) Establish a unit attention condition for the initiator
2795 * port associated with every registered I_T nexus other
2796 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2797 * command with CLEAR service action was received, with the
2798 * additional sense code set to RESERVATIONS PREEMPTED.
2799 */
6708bb27 2800 if (!calling_it_nexus)
c66ac9db
NB		 2801 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2802 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2803 }
2804 spin_unlock(&pr_tmpl->registration_lock);
2805
6708bb27 2806 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
e3d6f909 2807 cmd->se_tfo->get_fabric_name());
c66ac9db
NB		 2808
2809 if (pr_tmpl->pr_aptpl_active) {
5951146d 2810 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 2811 pr_debug("SPC-3 PR: Updated APTPL metadata"
c66ac9db
NB		 2812 " for CLEAR\n");
2813 }
2814
2815 core_scsi3_pr_generation(dev);
2816 return 0;
2817}
2818
2819/*
2820 * Called with struct se_device->dev_reservation_lock held.
2821 */
2822static void __core_scsi3_complete_pro_preempt(
2823 struct se_device *dev,
2824 struct t10_pr_registration *pr_reg,
2825 struct list_head *preempt_and_abort_list,
2826 int type,
2827 int scope,
2828 int abort)
2829{
2830 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2831 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2832 char i_buf[PR_REG_ISID_ID_LEN];
2833 int prf_isid;
2834
2835 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2836 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2837 PR_REG_ISID_ID_LEN);
2838 /*
2839 * Do an implict RELEASE of the existing reservation.
2840 */
2841 if (dev->dev_pr_res_holder)
2842 __core_scsi3_complete_pro_release(dev, nacl,
2843 dev->dev_pr_res_holder, 0);
2844
2845 dev->dev_pr_res_holder = pr_reg;
2846 pr_reg->pr_res_holder = 1;
2847 pr_reg->pr_res_type = type;
2848 pr_reg->pr_res_scope = scope;
2849
6708bb27 2850 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
c66ac9db
NB		 2851 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2852 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2853 core_scsi3_pr_dump_type(type),
2854 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
6708bb27 2855 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
c66ac9db
NB		 2856 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2857 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2858 /*
2859 * For PREEMPT_AND_ABORT, add the preempting reservation's
2860 * struct t10_pr_registration to the list that will be compared
2861 * against received CDBs..
2862 */
2863 if (preempt_and_abort_list)
2864 list_add_tail(&pr_reg->pr_reg_abort_list,
2865 preempt_and_abort_list);
2866}
2867
2868static void core_scsi3_release_preempt_and_abort(
2869 struct list_head *preempt_and_abort_list,
2870 struct t10_pr_registration *pr_reg_holder)
2871{
2872 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2873
2874 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2875 pr_reg_abort_list) {
2876
2877 list_del(&pr_reg->pr_reg_abort_list);
2878 if (pr_reg_holder == pr_reg)
2879 continue;
2880 if (pr_reg->pr_res_holder) {
6708bb27 2881 pr_warn("pr_reg->pr_res_holder still set\n");
c66ac9db
NB		 2882 continue;
2883 }
2884
2885 pr_reg->pr_reg_deve = NULL;
2886 pr_reg->pr_reg_nacl = NULL;
2887 kfree(pr_reg->pr_aptpl_buf);
2888 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2889 }
2890}
2891
de103c93
CH		 2892static sense_reason_t
2893core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2894 u64 sa_res_key, int abort)
c66ac9db 2895{
5951146d 2896 struct se_device *dev = cmd->se_dev;
c66ac9db 2897 struct se_node_acl *pr_reg_nacl;
e3d6f909 2898 struct se_session *se_sess = cmd->se_sess;
d0f474e5 2899 LIST_HEAD(preempt_and_abort_list);
c66ac9db 2900 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
0fd97ccf 2901 struct t10_reservation *pr_tmpl = &dev->t10_pr;
c66ac9db
NB		 2902 u32 pr_res_mapped_lun = 0;
2903 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
de103c93 2904 int prh_type = 0, prh_scope = 0;
c66ac9db 2905
de103c93
CH		 2906 if (!se_sess)
2907 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2908
5951146d 2909 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 2910 se_sess);
6708bb27
AG		 2911 if (!pr_reg_n) {
2912 pr_err("SPC-3 PR: Unable to locate"
c66ac9db
NB		 2913 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2914 (abort) ? "_AND_ABORT" : "");
de103c93 2915 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2916 }
2917 if (pr_reg_n->pr_res_key != res_key) {
2918 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2919 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 2920 }
2921 if (scope != PR_SCOPE_LU_SCOPE) {
6708bb27 2922 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
c66ac9db 2923 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2924 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 2925 }
c66ac9db
NB		 2926
2927 spin_lock(&dev->dev_reservation_lock);
2928 pr_res_holder = dev->dev_pr_res_holder;
2929 if (pr_res_holder &&
2930 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2931 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2932 all_reg = 1;
2933
6708bb27 2934 if (!all_reg && !sa_res_key) {
c66ac9db
NB		 2935 spin_unlock(&dev->dev_reservation_lock);
2936 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 2937 return TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 2938 }
2939 /*
2940 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2941 *
2942 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2943 * persistent reservation holder or there is no persistent reservation
2944 * holder (i.e., there is no persistent reservation), then the device
2945 * server shall perform a preempt by doing the following in an
2946 * uninterrupted series of actions. (See below..)
2947 */
6708bb27 2948 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
c66ac9db
NB		 2949 /*
2950 * No existing or SA Reservation Key matching reservations..
2951 *
2952 * PROUT SA PREEMPT with All Registrant type reservations are
2953 * allowed to be processed without a matching SA Reservation Key
2954 */
2955 spin_lock(&pr_tmpl->registration_lock);
2956 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2957 &pr_tmpl->registration_list, pr_reg_list) {
2958 /*
2959 * Removing of registrations in non all registrants
2960 * type reservations without a matching SA reservation
2961 * key.
2962 *
2963 * a) Remove the registrations for all I_T nexuses
2964 * specified by the SERVICE ACTION RESERVATION KEY
2965 * field;
2966 * b) Ignore the contents of the SCOPE and TYPE fields;
2967 * c) Process tasks as defined in 5.7.1; and
2968 * d) Establish a unit attention condition for the
2969 * initiator port associated with every I_T nexus
2970 * that lost its registration other than the I_T
2971 * nexus on which the PERSISTENT RESERVE OUT command
2972 * was received, with the additional sense code set
2973 * to REGISTRATIONS PREEMPTED.
2974 */
6708bb27 2975 if (!all_reg) {
c66ac9db
NB		 2976 if (pr_reg->pr_res_key != sa_res_key)
2977 continue;
2978
2979 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2980 pr_reg_nacl = pr_reg->pr_reg_nacl;
2981 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2982 __core_scsi3_free_registration(dev, pr_reg,
2983 (abort) ? &preempt_and_abort_list :
2984 NULL, calling_it_nexus);
2985 released_regs++;
2986 } else {
2987 /*
2988 * Case for any existing all registrants type
2989 * reservation, follow logic in spc4r17 section
2990 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2991 *
2992 * For a ZERO SA Reservation key, release
2993 * all other registrations and do an implict
2994 * release of active persistent reservation.
2995 *
2996 * For a non-ZERO SA Reservation key, only
2997 * release the matching reservation key from
2998 * registrations.
2999 */
3000 if ((sa_res_key) &&
3001 (pr_reg->pr_res_key != sa_res_key))
3002 continue;
3003
3004 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3005 if (calling_it_nexus)
3006 continue;
3007
3008 pr_reg_nacl = pr_reg->pr_reg_nacl;
3009 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3010 __core_scsi3_free_registration(dev, pr_reg,
3011 (abort) ? &preempt_and_abort_list :
3012 NULL, 0);
3013 released_regs++;
3014 }
6708bb27 3015 if (!calling_it_nexus)
c66ac9db
NB		 3016 core_scsi3_ua_allocate(pr_reg_nacl,
3017 pr_res_mapped_lun, 0x2A,
9e08e34e 3018 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3019 }
3020 spin_unlock(&pr_tmpl->registration_lock);
3021 /*
3022 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3023 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3024 * RESERVATION KEY field to a value that does not match any
3025 * registered reservation key, then the device server shall
3026 * complete the command with RESERVATION CONFLICT status.
3027 */
6708bb27 3028 if (!released_regs) {
c66ac9db
NB		 3029 spin_unlock(&dev->dev_reservation_lock);
3030 core_scsi3_put_pr_reg(pr_reg_n);
de103c93 3031 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3032 }
3033 /*
3034 * For an existing all registrants type reservation
3035 * with a zero SA rservation key, preempt the existing
3036 * reservation with the new PR type and scope.
3037 */
3038 if (pr_res_holder && all_reg && !(sa_res_key)) {
3039 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3040 (abort) ? &preempt_and_abort_list : NULL,
3041 type, scope, abort);
3042
3043 if (abort)
3044 core_scsi3_release_preempt_and_abort(
3045 &preempt_and_abort_list, pr_reg_n);
3046 }
3047 spin_unlock(&dev->dev_reservation_lock);
3048
3049 if (pr_tmpl->pr_aptpl_active) {
de103c93 3050 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
c66ac9db 3051 &pr_reg_n->pr_aptpl_buf[0],
de103c93 3052 pr_tmpl->pr_aptpl_buf_len)) {
6708bb27 3053 pr_debug("SPC-3 PR: Updated APTPL"
c66ac9db
NB		 3054 " metadata for PREEMPT%s\n", (abort) ?
3055 "_AND_ABORT" : "");
de103c93 3056 }
c66ac9db
NB		 3057 }
3058
3059 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3060 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3061 return 0;
3062 }
3063 /*
3064 * The PREEMPTing SA reservation key matches that of the
3065 * existing persistent reservation, first, we check if
3066 * we are preempting our own reservation.
3067 * From spc4r17, section 5.7.11.4.3 Preempting
3068 * persistent reservations and registration handling
3069 *
3070 * If an all registrants persistent reservation is not
3071 * present, it is not an error for the persistent
3072 * reservation holder to preempt itself (i.e., a
3073 * PERSISTENT RESERVE OUT with a PREEMPT service action
3074 * or a PREEMPT AND ABORT service action with the
3075 * SERVICE ACTION RESERVATION KEY value equal to the
3076 * persistent reservation holder's reservation key that
3077 * is received from the persistent reservation holder).
3078 * In that case, the device server shall establish the
3079 * new persistent reservation and maintain the
3080 * registration.
3081 */
3082 prh_type = pr_res_holder->pr_res_type;
3083 prh_scope = pr_res_holder->pr_res_scope;
3084 /*
3085 * If the SERVICE ACTION RESERVATION KEY field identifies a
3086 * persistent reservation holder (see 5.7.10), the device
3087 * server shall perform a preempt by doing the following as
3088 * an uninterrupted series of actions:
3089 *
3090 * a) Release the persistent reservation for the holder
3091 * identified by the SERVICE ACTION RESERVATION KEY field;
3092 */
3093 if (pr_reg_n != pr_res_holder)
3094 __core_scsi3_complete_pro_release(dev,
3095 pr_res_holder->pr_reg_nacl,
3096 dev->dev_pr_res_holder, 0);
3097 /*
3098 * b) Remove the registrations for all I_T nexuses identified
3099 * by the SERVICE ACTION RESERVATION KEY field, except the
3100 * I_T nexus that is being used for the PERSISTENT RESERVE
3101 * OUT command. If an all registrants persistent reservation
3102 * is present and the SERVICE ACTION RESERVATION KEY field
3103 * is set to zero, then all registrations shall be removed
3104 * except for that of the I_T nexus that is being used for
3105 * the PERSISTENT RESERVE OUT command;
3106 */
3107 spin_lock(&pr_tmpl->registration_lock);
3108 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3109 &pr_tmpl->registration_list, pr_reg_list) {
3110
3111 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3112 if (calling_it_nexus)
3113 continue;
3114
3115 if (pr_reg->pr_res_key != sa_res_key)
3116 continue;
3117
3118 pr_reg_nacl = pr_reg->pr_reg_nacl;
3119 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3120 __core_scsi3_free_registration(dev, pr_reg,
3121 (abort) ? &preempt_and_abort_list : NULL,
3122 calling_it_nexus);
3123 /*
3124 * e) Establish a unit attention condition for the initiator
3125 * port associated with every I_T nexus that lost its
3126 * persistent reservation and/or registration, with the
3127 * additional sense code set to REGISTRATIONS PREEMPTED;
3128 */
3129 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
9e08e34e 3130 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
c66ac9db
NB		 3131 }
3132 spin_unlock(&pr_tmpl->registration_lock);
3133 /*
3134 * c) Establish a persistent reservation for the preempting
3135 * I_T nexus using the contents of the SCOPE and TYPE fields;
3136 */
3137 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3138 (abort) ? &preempt_and_abort_list : NULL,
3139 type, scope, abort);
3140 /*
3141 * d) Process tasks as defined in 5.7.1;
3142 * e) See above..
3143 * f) If the type or scope has changed, then for every I_T nexus
3144 * whose reservation key was not removed, except for the I_T
3145 * nexus on which the PERSISTENT RESERVE OUT command was
3146 * received, the device server shall establish a unit
3147 * attention condition for the initiator port associated with
3148 * that I_T nexus, with the additional sense code set to
3149 * RESERVATIONS RELEASED. If the type or scope have not
3150 * changed, then no unit attention condition(s) shall be
3151 * established for this reason.
3152 */
3153 if ((prh_type != type) || (prh_scope != scope)) {
3154 spin_lock(&pr_tmpl->registration_lock);
3155 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3156 &pr_tmpl->registration_list, pr_reg_list) {
3157
3158 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3159 if (calling_it_nexus)
3160 continue;
3161
3162 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3163 pr_reg->pr_res_mapped_lun, 0x2A,
3164 ASCQ_2AH_RESERVATIONS_RELEASED);
3165 }
3166 spin_unlock(&pr_tmpl->registration_lock);
3167 }
3168 spin_unlock(&dev->dev_reservation_lock);
3169 /*
3170 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3171 * All received CDBs for the matching existing reservation and
3172 * registrations undergo ABORT_TASK logic.
3173 *
3174 * From there, core_scsi3_release_preempt_and_abort() will
3175 * release every registration in the list (which have already
3176 * been removed from the primary pr_reg list), except the
3177 * new persistent reservation holder, the calling Initiator Port.
3178 */
3179 if (abort) {
3180 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3181 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3182 pr_reg_n);
3183 }
3184
3185 if (pr_tmpl->pr_aptpl_active) {
de103c93 3186 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
c66ac9db 3187 &pr_reg_n->pr_aptpl_buf[0],
de103c93 3188 pr_tmpl->pr_aptpl_buf_len)) {
6708bb27 3189 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
de103c93
CH		 3190 "%s\n", abort ? "_AND_ABORT" : "");
3191 }
c66ac9db
NB		 3192 }
3193
3194 core_scsi3_put_pr_reg(pr_reg_n);
5951146d 3195 core_scsi3_pr_generation(cmd->se_dev);
c66ac9db
NB		 3196 return 0;
3197}
3198
de103c93
CH		 3199static sense_reason_t
3200core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3201 u64 res_key, u64 sa_res_key, int abort)
c66ac9db 3202{
c66ac9db
NB		 3203 switch (type) {
3204 case PR_TYPE_WRITE_EXCLUSIVE:
3205 case PR_TYPE_EXCLUSIVE_ACCESS:
3206 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3207 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3208 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3209 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
de103c93
CH		 3210 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3211 sa_res_key, abort);
c66ac9db 3212 default:
6708bb27 3213 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
c66ac9db 3214 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
de103c93 3215 return TCM_INVALID_CDB_FIELD;
c66ac9db 3216 }
c66ac9db
NB		 3217}
3218
3219
de103c93
CH		 3220static sense_reason_t
3221core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3222 u64 sa_res_key, int aptpl, int unreg)
c66ac9db 3223{
e3d6f909 3224 struct se_session *se_sess = cmd->se_sess;
5951146d 3225 struct se_device *dev = cmd->se_dev;
28168905 3226 struct se_dev_entry *dest_se_deve = NULL;
e3d6f909 3227 struct se_lun *se_lun = cmd->se_lun;
c66ac9db
NB		 3228 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3229 struct se_port *se_port;
3230 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3231 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3232 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
0fd97ccf 3233 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3234 unsigned char *buf;
c66ac9db
NB		 3235 unsigned char *initiator_str;
3236 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3237 u32 tid_len, tmp_tid_len;
de103c93
CH		 3238 int new_reg = 0, type, scope, matching_iname, prf_isid;
3239 sense_reason_t ret;
c66ac9db
NB		 3240 unsigned short rtpi;
3241 unsigned char proto_ident;
3242
6708bb27
AG		 3243 if (!se_sess || !se_lun) {
3244 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
de103c93 3245 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 3246 }
de103c93 3247
c66ac9db
NB		 3248 memset(dest_iport, 0, 64);
3249 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3250 se_tpg = se_sess->se_tpg;
e3d6f909 3251 tf_ops = se_tpg->se_tpg_tfo;
c66ac9db
NB		 3252 /*
3253 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3254 * Register behaviors for a REGISTER AND MOVE service action
3255 *
3256 * Locate the existing *pr_reg via struct se_node_acl pointers
3257 */
5951146d 3258 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
c66ac9db 3259 se_sess);
6708bb27
AG		 3260 if (!pr_reg) {
3261 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
c66ac9db 3262 " *pr_reg for REGISTER_AND_MOVE\n");
de103c93 3263 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3264 }
3265 /*
3266 * The provided reservation key much match the existing reservation key
3267 * provided during this initiator's I_T nexus registration.
3268 */
3269 if (res_key != pr_reg->pr_res_key) {
6708bb27 3270 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3271 " res_key: 0x%016Lx does not match existing SA REGISTER"
3272 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
de103c93
CH		 3273 ret = TCM_RESERVATION_CONFLICT;
3274 goto out_put_pr_reg;
c66ac9db
NB		 3275 }
3276 /*
3277 * The service active reservation key needs to be non zero
3278 */
6708bb27
AG		 3279 if (!sa_res_key) {
3280 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
c66ac9db 3281 " sa_res_key\n");
de103c93
CH		 3282 ret = TCM_INVALID_PARAMETER_LIST;
3283 goto out_put_pr_reg;
c66ac9db 3284 }
05d1c7c0 3285
c66ac9db
NB		 3286 /*
3287 * Determine the Relative Target Port Identifier where the reservation
3288 * will be moved to for the TransportID containing SCSI initiator WWN
3289 * information.
3290 */
4949314c 3291 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3292 if (!buf) {
3293 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3294 goto out_put_pr_reg;
3295 }
3296
c66ac9db
NB		 3297 rtpi = (buf[18] & 0xff) << 8;
3298 rtpi |= buf[19] & 0xff;
3299 tid_len = (buf[20] & 0xff) << 24;
3300 tid_len |= (buf[21] & 0xff) << 16;
3301 tid_len |= (buf[22] & 0xff) << 8;
3302 tid_len |= buf[23] & 0xff;
4949314c 3303 transport_kunmap_data_sg(cmd);
05d1c7c0 3304 buf = NULL;
c66ac9db
NB		 3305
3306 if ((tid_len + 24) != cmd->data_length) {
6708bb27 3307 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
c66ac9db
NB		 3308 " does not equal CDB data_length: %u\n", tid_len,
3309 cmd->data_length);
de103c93
CH		 3310 ret = TCM_INVALID_PARAMETER_LIST;
3311 goto out_put_pr_reg;
c66ac9db
NB		 3312 }
3313
3314 spin_lock(&dev->se_port_lock);
3315 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3316 if (se_port->sep_rtpi != rtpi)
3317 continue;
3318 dest_se_tpg = se_port->sep_tpg;
6708bb27 3319 if (!dest_se_tpg)
c66ac9db 3320 continue;
e3d6f909 3321 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
6708bb27 3322 if (!dest_tf_ops)
c66ac9db
NB		 3323 continue;
3324
3325 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3326 smp_mb__after_atomic_inc();
3327 spin_unlock(&dev->se_port_lock);
3328
de103c93 3329 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
6708bb27 3330 pr_err("core_scsi3_tpg_depend_item() failed"
c66ac9db
NB		 3331 " for dest_se_tpg\n");
3332 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3333 smp_mb__after_atomic_dec();
de103c93
CH		 3334 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3335 goto out_put_pr_reg;
c66ac9db
NB		 3336 }
3337
3338 spin_lock(&dev->se_port_lock);
3339 break;
3340 }
3341 spin_unlock(&dev->se_port_lock);
3342
6708bb27
AG		 3343 if (!dest_se_tpg || !dest_tf_ops) {
3344 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db
NB		 3345 " fabric ops from Relative Target Port Identifier:"
3346 " %hu\n", rtpi);
de103c93
CH		 3347 ret = TCM_INVALID_PARAMETER_LIST;
3348 goto out_put_pr_reg;
c66ac9db 3349 }
05d1c7c0 3350
4949314c 3351 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3352 if (!buf) {
3353 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3354 goto out_put_pr_reg;
3355 }
c66ac9db 3356 proto_ident = (buf[24] & 0x0f);
8b1e1244 3357
6708bb27 3358 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
c66ac9db 3359 " 0x%02x\n", proto_ident);
8b1e1244 3360
c66ac9db 3361 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
6708bb27 3362 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
c66ac9db
NB		 3363 " proto_ident: 0x%02x does not match ident: 0x%02x"
3364 " from fabric: %s\n", proto_ident,
3365 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3366 dest_tf_ops->get_fabric_name());
de103c93 3367 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3368 goto out;
3369 }
3370 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
6708bb27 3371 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
c66ac9db
NB		 3372 " containg a valid tpg_parse_pr_out_transport_id"
3373 " function pointer\n");
de103c93 3374 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3375 goto out;
3376 }
3377 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3378 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
6708bb27
AG		 3379 if (!initiator_str) {
3380 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
c66ac9db 3381 " initiator_str from Transport ID\n");
de103c93 3382 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3383 goto out;
3384 }
3385
4949314c 3386 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3387 buf = NULL;
3388
6708bb27 3389 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
c66ac9db
NB		 3390 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3391 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3392 iport_ptr : "");
3393 /*
3394 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3395 * action specifies a TransportID that is the same as the initiator port
3396 * of the I_T nexus for the command received, then the command shall
3397 * be terminated with CHECK CONDITION status, with the sense key set to
3398 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3399 * IN PARAMETER LIST.
3400 */
3401 pr_reg_nacl = pr_reg->pr_reg_nacl;
3402 matching_iname = (!strcmp(initiator_str,
3403 pr_reg_nacl->initiatorname)) ? 1 : 0;
6708bb27 3404 if (!matching_iname)
c66ac9db
NB		 3405 goto after_iport_check;
3406
6708bb27
AG		 3407 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3408 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
c66ac9db
NB		 3409 " matches: %s on received I_T Nexus\n", initiator_str,
3410 pr_reg_nacl->initiatorname);
de103c93 3411 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3412 goto out;
3413 }
6708bb27
AG		 3414 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3415 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
c66ac9db
NB		 3416 " matches: %s %s on received I_T Nexus\n",
3417 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3418 pr_reg->pr_reg_isid);
de103c93 3419 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3420 goto out;
3421 }
3422after_iport_check:
3423 /*
3424 * Locate the destination struct se_node_acl from the received Transport ID
3425 */
28638887 3426 spin_lock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db
NB		 3427 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3428 initiator_str);
3429 if (dest_node_acl) {
3430 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3431 smp_mb__after_atomic_inc();
3432 }
28638887 3433 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
c66ac9db 3434
6708bb27
AG		 3435 if (!dest_node_acl) {
3436 pr_err("Unable to locate %s dest_node_acl for"
c66ac9db
NB		 3437 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3438 initiator_str);
de103c93 3439 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3440 goto out;
3441 }
de103c93
CH		 3442
3443 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
6708bb27 3444 pr_err("core_scsi3_nodeacl_depend_item() for"
c66ac9db
NB		 3445 " dest_node_acl\n");
3446 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3447 smp_mb__after_atomic_dec();
3448 dest_node_acl = NULL;
de103c93 3449 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3450 goto out;
3451 }
8b1e1244 3452
6708bb27 3453 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
c66ac9db
NB		 3454 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3455 dest_node_acl->initiatorname);
8b1e1244 3456
c66ac9db
NB		 3457 /*
3458 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3459 * PORT IDENTIFIER.
3460 */
3461 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
6708bb27
AG		 3462 if (!dest_se_deve) {
3463 pr_err("Unable to locate %s dest_se_deve from RTPI:"
c66ac9db 3464 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
de103c93 3465 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3466 goto out;
3467 }
3468
de103c93 3469 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
6708bb27 3470 pr_err("core_scsi3_lunacl_depend_item() failed\n");
c66ac9db
NB		 3471 atomic_dec(&dest_se_deve->pr_ref_count);
3472 smp_mb__after_atomic_dec();
3473 dest_se_deve = NULL;
de103c93 3474 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3475 goto out;
3476 }
8b1e1244 3477
6708bb27 3478 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
c66ac9db
NB		 3479 " ACL for dest_se_deve->mapped_lun: %u\n",
3480 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3481 dest_se_deve->mapped_lun);
8b1e1244 3482
c66ac9db
NB		 3483 /*
3484 * A persistent reservation needs to already existing in order to
3485 * successfully complete the REGISTER_AND_MOVE service action..
3486 */
3487 spin_lock(&dev->dev_reservation_lock);
3488 pr_res_holder = dev->dev_pr_res_holder;
6708bb27
AG		 3489 if (!pr_res_holder) {
3490 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
c66ac9db
NB		 3491 " currently held\n");
3492 spin_unlock(&dev->dev_reservation_lock);
de103c93 3493 ret = TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3494 goto out;
3495 }
3496 /*
3497 * The received on I_T Nexus must be the reservation holder.
3498 *
3499 * From spc4r17 section 5.7.8 Table 50 --
3500 * Register behaviors for a REGISTER AND MOVE service action
3501 */
3502 if (pr_res_holder != pr_reg) {
6708bb27 3503 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
c66ac9db
NB		 3504 " Nexus is not reservation holder\n");
3505 spin_unlock(&dev->dev_reservation_lock);
de103c93 3506 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3507 goto out;
3508 }
3509 /*
3510 * From spc4r17 section 5.7.8: registering and moving reservation
3511 *
3512 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3513 * action is received and the established persistent reservation is a
3514 * Write Exclusive - All Registrants type or Exclusive Access -
3515 * All Registrants type reservation, then the command shall be completed
3516 * with RESERVATION CONFLICT status.
3517 */
3518 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3519 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
6708bb27 3520 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
c66ac9db
NB		 3521 " reservation for type: %s\n",
3522 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3523 spin_unlock(&dev->dev_reservation_lock);
de103c93 3524 ret = TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 3525 goto out;
3526 }
3527 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3528 /*
3529 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3530 */
3531 type = pr_res_holder->pr_res_type;
3532 scope = pr_res_holder->pr_res_type;
3533 /*
3534 * c) Associate the reservation key specified in the SERVICE ACTION
3535 * RESERVATION KEY field with the I_T nexus specified as the
3536 * destination of the register and move, where:
3537 * A) The I_T nexus is specified by the TransportID and the
3538 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3539 * B) Regardless of the TransportID format used, the association for
3540 * the initiator port is based on either the initiator port name
3541 * (see 3.1.71) on SCSI transport protocols where port names are
3542 * required or the initiator port identifier (see 3.1.70) on SCSI
3543 * transport protocols where port names are not required;
3544 * d) Register the reservation key specified in the SERVICE ACTION
3545 * RESERVATION KEY field;
3546 * e) Retain the reservation key specified in the SERVICE ACTION
3547 * RESERVATION KEY field and associated information;
3548 *
3549 * Also, It is not an error for a REGISTER AND MOVE service action to
3550 * register an I_T nexus that is already registered with the same
3551 * reservation key or a different reservation key.
3552 */
3553 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3554 iport_ptr);
6708bb27 3555 if (!dest_pr_reg) {
de103c93 3556 if (core_scsi3_alloc_registration(cmd->se_dev,
c66ac9db 3557 dest_node_acl, dest_se_deve, iport_ptr,
de103c93 3558 sa_res_key, 0, aptpl, 2, 1)) {
c66ac9db 3559 spin_unlock(&dev->dev_reservation_lock);
de103c93 3560 ret = TCM_INVALID_PARAMETER_LIST;
c66ac9db
NB		 3561 goto out;
3562 }
3563 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3564 iport_ptr);
3565 new_reg = 1;
3566 }
3567 /*
3568 * f) Release the persistent reservation for the persistent reservation
3569 * holder (i.e., the I_T nexus on which the
3570 */
3571 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3572 dev->dev_pr_res_holder, 0);
3573 /*
3574 * g) Move the persistent reservation to the specified I_T nexus using
3575 * the same scope and type as the persistent reservation released in
3576 * item f); and
3577 */
3578 dev->dev_pr_res_holder = dest_pr_reg;
3579 dest_pr_reg->pr_res_holder = 1;
3580 dest_pr_reg->pr_res_type = type;
3581 pr_reg->pr_res_scope = scope;
3582 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3583 PR_REG_ISID_ID_LEN);
3584 /*
3585 * Increment PRGeneration for existing registrations..
3586 */
6708bb27 3587 if (!new_reg)
c66ac9db
NB		 3588 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3589 spin_unlock(&dev->dev_reservation_lock);
3590
6708bb27 3591 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
c66ac9db
NB		 3592 " created new reservation holder TYPE: %s on object RTPI:"
3593 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3594 core_scsi3_pr_dump_type(type), rtpi,
3595 dest_pr_reg->pr_res_generation);
6708bb27 3596 pr_debug("SPC-3 PR Successfully moved reservation from"
c66ac9db
NB		 3597 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3598 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3599 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3600 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3601 iport_ptr : "");
3602 /*
3603 * It is now safe to release configfs group dependencies for destination
3604 * of Transport ID Initiator Device/Port Identifier
3605 */
3606 core_scsi3_lunacl_undepend_item(dest_se_deve);
3607 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3608 core_scsi3_tpg_undepend_item(dest_se_tpg);
3609 /*
3610 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3611 * nexus on which PERSISTENT RESERVE OUT command was received.
3612 */
3613 if (unreg) {
3614 spin_lock(&pr_tmpl->registration_lock);
3615 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3616 spin_unlock(&pr_tmpl->registration_lock);
3617 } else
3618 core_scsi3_put_pr_reg(pr_reg);
3619
3620 /*
3621 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3622 * write out the updated metadata to struct file for this SCSI device.
3623 */
6708bb27 3624 if (!aptpl) {
c66ac9db 3625 pr_tmpl->pr_aptpl_active = 0;
5951146d 3626 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
6708bb27 3627 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
c66ac9db
NB		 3628 " REGISTER_AND_MOVE\n");
3629 } else {
3630 pr_tmpl->pr_aptpl_active = 1;
de103c93 3631 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
c66ac9db 3632 &dest_pr_reg->pr_aptpl_buf[0],
de103c93 3633 pr_tmpl->pr_aptpl_buf_len)) {
6708bb27 3634 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
c66ac9db 3635 " REGISTER_AND_MOVE\n");
de103c93 3636 }
c66ac9db
NB		 3637 }
3638
4949314c 3639 transport_kunmap_data_sg(cmd);
05d1c7c0 3640
c66ac9db
NB		 3641 core_scsi3_put_pr_reg(dest_pr_reg);
3642 return 0;
3643out:
05d1c7c0 3644 if (buf)
4949314c 3645 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3646 if (dest_se_deve)
3647 core_scsi3_lunacl_undepend_item(dest_se_deve);
3648 if (dest_node_acl)
3649 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3650 core_scsi3_tpg_undepend_item(dest_se_tpg);
de103c93
CH		 3651
3652out_put_pr_reg:
c66ac9db
NB		 3653 core_scsi3_put_pr_reg(pr_reg);
3654 return ret;
3655}
3656
3657static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3658{
3659 unsigned int __v1, __v2;
3660
3661 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3662 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3663
3664 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3665}
3666
3667/*
3668 * See spc4r17 section 6.14 Table 170
3669 */
de103c93
CH		 3670sense_reason_t
3671target_scsi3_emulate_pr_out(struct se_cmd *cmd)
c66ac9db 3672{
617c0e06 3673 unsigned char *cdb = &cmd->t_task_cdb[0];
05d1c7c0 3674 unsigned char *buf;
c66ac9db
NB		 3675 u64 res_key, sa_res_key;
3676 int sa, scope, type, aptpl;
3677 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
de103c93 3678 sense_reason_t ret;
617c0e06
CH		 3679
3680 /*
3681 * Following spc2r20 5.5.1 Reservations overview:
3682 *
3683 * If a logical unit has been reserved by any RESERVE command and is
3684 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3685 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3686 * initiator or service action and shall terminate with a RESERVATION
3687 * CONFLICT status.
3688 */
0fd97ccf 3689 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
617c0e06
CH		 3690 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3691 " SPC-2 reservation is held, returning"
3692 " RESERVATION_CONFLICT\n");
de103c93 3693 return TCM_RESERVATION_CONFLICT;
617c0e06
CH		 3694 }
3695
c66ac9db
NB		 3696 /*
3697 * FIXME: A NULL struct se_session pointer means an this is not coming from
3698 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3699 */
de103c93
CH		 3700 if (!cmd->se_sess)
3701 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3702
3703 if (cmd->data_length < 24) {
6708bb27 3704 pr_warn("SPC-PR: Received PR OUT parameter list"
c66ac9db 3705 " length too small: %u\n", cmd->data_length);
de103c93 3706 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3707 }
de103c93 3708
c66ac9db
NB		 3709 /*
3710 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3711 */
3712 sa = (cdb[1] & 0x1f);
3713 scope = (cdb[2] & 0xf0);
3714 type = (cdb[2] & 0x0f);
05d1c7c0 3715
4949314c 3716 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3717 if (!buf)
3718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3719
c66ac9db
NB		 3720 /*
3721 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3722 */
3723 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3724 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3725 /*
3726 * REGISTER_AND_MOVE uses a different SA parameter list containing
3727 * SCSI TransportIDs.
3728 */
3729 if (sa != PRO_REGISTER_AND_MOVE) {
3730 spec_i_pt = (buf[20] & 0x08);
3731 all_tg_pt = (buf[20] & 0x04);
3732 aptpl = (buf[20] & 0x01);
3733 } else {
3734 aptpl = (buf[17] & 0x01);
3735 unreg = (buf[17] & 0x02);
3736 }
4949314c 3737 transport_kunmap_data_sg(cmd);
05d1c7c0
AG		 3738 buf = NULL;
3739
c66ac9db
NB		 3740 /*
3741 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3742 */
de103c93
CH		 3743 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3744 return TCM_INVALID_PARAMETER_LIST;
d29a5b6a 3745
c66ac9db
NB		 3746 /*
3747 * From spc4r17 section 6.14:
3748 *
3749 * If the SPEC_I_PT bit is set to zero, the service action is not
3750 * REGISTER AND MOVE, and the parameter list length is not 24, then
3751 * the command shall be terminated with CHECK CONDITION status, with
3752 * the sense key set to ILLEGAL REQUEST, and the additional sense
3753 * code set to PARAMETER LIST LENGTH ERROR.
3754 */
6708bb27 3755 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
c66ac9db 3756 (cmd->data_length != 24)) {
6708bb27 3757 pr_warn("SPC-PR: Received PR OUT illegal parameter"
c66ac9db 3758 " list length: %u\n", cmd->data_length);
de103c93 3759 return TCM_INVALID_PARAMETER_LIST;
c66ac9db 3760 }
de103c93 3761
c66ac9db
NB		 3762 /*
3763 * (core_scsi3_emulate_pro_* function parameters
3764 * are defined by spc4r17 Table 174:
3765 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3766 */
3767 switch (sa) {
3768 case PRO_REGISTER:
d29a5b6a 3769 ret = core_scsi3_emulate_pro_register(cmd,
c66ac9db 3770 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
d29a5b6a 3771 break;
c66ac9db 3772 case PRO_RESERVE:
d29a5b6a
CH		 3773 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3774 break;
c66ac9db 3775 case PRO_RELEASE:
d29a5b6a
CH		 3776 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3777 break;
c66ac9db 3778 case PRO_CLEAR:
d29a5b6a
CH		 3779 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3780 break;
c66ac9db 3781 case PRO_PREEMPT:
d29a5b6a 3782 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
c66ac9db 3783 res_key, sa_res_key, 0);
d29a5b6a 3784 break;
c66ac9db 3785 case PRO_PREEMPT_AND_ABORT:
d29a5b6a 3786 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
c66ac9db 3787 res_key, sa_res_key, 1);
d29a5b6a 3788 break;
c66ac9db 3789 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
d29a5b6a 3790 ret = core_scsi3_emulate_pro_register(cmd,
c66ac9db 3791 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
d29a5b6a 3792 break;
c66ac9db 3793 case PRO_REGISTER_AND_MOVE:
d29a5b6a 3794 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
c66ac9db 3795 sa_res_key, aptpl, unreg);
d29a5b6a 3796 break;
c66ac9db 3797 default:
6708bb27 3798 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
c66ac9db 3799 " action: 0x%02x\n", cdb[1] & 0x1f);
de103c93 3800 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3801 }
3802
6bb35e00
CH		 3803 if (!ret)
3804 target_complete_cmd(cmd, GOOD);
d29a5b6a 3805 return ret;
c66ac9db
NB		 3806}
3807
3808/*
3809 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3810 *
3811 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3812 */
de103c93
CH		 3813static sense_reason_t
3814core_scsi3_pri_read_keys(struct se_cmd *cmd)
c66ac9db 3815{
0fd97ccf 3816 struct se_device *dev = cmd->se_dev;
c66ac9db 3817 struct t10_pr_registration *pr_reg;
05d1c7c0 3818 unsigned char *buf;
c66ac9db
NB		 3819 u32 add_len = 0, off = 8;
3820
3821 if (cmd->data_length < 8) {
6708bb27 3822 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
c66ac9db 3823 " too small\n", cmd->data_length);
de103c93 3824 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3825 }
3826
4949314c 3827 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3828 if (!buf)
3829 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3830
0fd97ccf
CH		 3831 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3832 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3833 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3834 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3835
0fd97ccf
CH		 3836 spin_lock(&dev->t10_pr.registration_lock);
3837 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
c66ac9db
NB		 3838 pr_reg_list) {
3839 /*
3840 * Check for overflow of 8byte PRI READ_KEYS payload and
3841 * next reservation key list descriptor.
3842 */
3843 if ((add_len + 8) > (cmd->data_length - 8))
3844 break;
3845
3846 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3847 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3848 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3849 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3850 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3851 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3852 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3853 buf[off++] = (pr_reg->pr_res_key & 0xff);
3854
3855 add_len += 8;
3856 }
0fd97ccf 3857 spin_unlock(&dev->t10_pr.registration_lock);
c66ac9db
NB		 3858
3859 buf[4] = ((add_len >> 24) & 0xff);
3860 buf[5] = ((add_len >> 16) & 0xff);
3861 buf[6] = ((add_len >> 8) & 0xff);
3862 buf[7] = (add_len & 0xff);
3863
4949314c 3864 transport_kunmap_data_sg(cmd);
05d1c7c0 3865
c66ac9db
NB		 3866 return 0;
3867}
3868
3869/*
3870 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3871 *
3872 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3873 */
de103c93
CH		 3874static sense_reason_t
3875core_scsi3_pri_read_reservation(struct se_cmd *cmd)
c66ac9db 3876{
0fd97ccf 3877 struct se_device *dev = cmd->se_dev;
c66ac9db 3878 struct t10_pr_registration *pr_reg;
05d1c7c0 3879 unsigned char *buf;
c66ac9db
NB		 3880 u64 pr_res_key;
3881 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3882
3883 if (cmd->data_length < 8) {
6708bb27 3884 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
c66ac9db 3885 " too small\n", cmd->data_length);
de103c93 3886 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3887 }
3888
4949314c 3889 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3890 if (!buf)
3891 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3892
0fd97ccf
CH		 3893 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3894 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3895 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3896 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 3897
0fd97ccf
CH		 3898 spin_lock(&dev->dev_reservation_lock);
3899 pr_reg = dev->dev_pr_res_holder;
ee1b1b9c 3900 if (pr_reg) {
c66ac9db
NB		 3901 /*
3902 * Set the hardcoded Additional Length
3903 */
3904 buf[4] = ((add_len >> 24) & 0xff);
3905 buf[5] = ((add_len >> 16) & 0xff);
3906 buf[6] = ((add_len >> 8) & 0xff);
3907 buf[7] = (add_len & 0xff);
3908
05d1c7c0
AG		 3909 if (cmd->data_length < 22)
3910 goto err;
3911
c66ac9db
NB		 3912 /*
3913 * Set the Reservation key.
3914 *
3915 * From spc4r17, section 5.7.10:
3916 * A persistent reservation holder has its reservation key
3917 * returned in the parameter data from a PERSISTENT
3918 * RESERVE IN command with READ RESERVATION service action as
3919 * follows:
3920 * a) For a persistent reservation of the type Write Exclusive
3921 * - All Registrants or Exclusive Access ­ All Regitrants,
3922 * the reservation key shall be set to zero; or
3923 * b) For all other persistent reservation types, the
3924 * reservation key shall be set to the registered
3925 * reservation key for the I_T nexus that holds the
3926 * persistent reservation.
3927 */
3928 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3929 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3930 pr_res_key = 0;
3931 else
3932 pr_res_key = pr_reg->pr_res_key;
3933
3934 buf[8] = ((pr_res_key >> 56) & 0xff);
3935 buf[9] = ((pr_res_key >> 48) & 0xff);
3936 buf[10] = ((pr_res_key >> 40) & 0xff);
3937 buf[11] = ((pr_res_key >> 32) & 0xff);
3938 buf[12] = ((pr_res_key >> 24) & 0xff);
3939 buf[13] = ((pr_res_key >> 16) & 0xff);
3940 buf[14] = ((pr_res_key >> 8) & 0xff);
3941 buf[15] = (pr_res_key & 0xff);
3942 /*
3943 * Set the SCOPE and TYPE
3944 */
3945 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3946 (pr_reg->pr_res_type & 0x0f);
3947 }
05d1c7c0
AG		 3948
3949err:
0fd97ccf 3950 spin_unlock(&dev->dev_reservation_lock);
4949314c 3951 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 3952
3953 return 0;
3954}
3955
3956/*
3957 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3958 *
3959 * See spc4r17 section 6.13.4 Table 165
3960 */
de103c93
CH		 3961static sense_reason_t
3962core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
c66ac9db 3963{
5951146d 3964 struct se_device *dev = cmd->se_dev;
0fd97ccf 3965 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 3966 unsigned char *buf;
c66ac9db
NB		 3967 u16 add_len = 8; /* Hardcoded to 8. */
3968
3969 if (cmd->data_length < 6) {
6708bb27 3970 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
c66ac9db 3971 " %u too small\n", cmd->data_length);
de103c93 3972 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 3973 }
3974
4949314c 3975 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 3976 if (!buf)
3977 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 3978
c66ac9db
NB		 3979 buf[0] = ((add_len << 8) & 0xff);
3980 buf[1] = (add_len & 0xff);
3981 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3982 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3983 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3984 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3985 /*
3986 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3987 * set the TMV: Task Mask Valid bit.
3988 */
3989 buf[3] |= 0x80;
3990 /*
3991 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3992 */
3993 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3994 /*
3995 * PTPL_A: Persistence across Target Power Loss Active bit
3996 */
3997 if (pr_tmpl->pr_aptpl_active)
3998 buf[3] |= 0x01;
3999 /*
4000 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4001 */
4002 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4003 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4004 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4005 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4006 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4007 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4008
4949314c 4009 transport_kunmap_data_sg(cmd);
05d1c7c0 4010
c66ac9db
NB		 4011 return 0;
4012}
4013
4014/*
4015 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4016 *
4017 * See spc4r17 section 6.13.5 Table 168 and 169
4018 */
de103c93
CH		 4019static sense_reason_t
4020core_scsi3_pri_read_full_status(struct se_cmd *cmd)
c66ac9db 4021{
0fd97ccf 4022 struct se_device *dev = cmd->se_dev;
c66ac9db 4023 struct se_node_acl *se_nacl;
c66ac9db
NB		 4024 struct se_portal_group *se_tpg;
4025 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0fd97ccf 4026 struct t10_reservation *pr_tmpl = &dev->t10_pr;
05d1c7c0 4027 unsigned char *buf;
c66ac9db
NB		 4028 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4029 u32 off = 8; /* off into first Full Status descriptor */
dba66c15
NB		 4030 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
4031 bool all_reg = false;
c66ac9db
NB		 4032
4033 if (cmd->data_length < 8) {
6708bb27 4034 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
c66ac9db 4035 " too small\n", cmd->data_length);
de103c93 4036 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 4037 }
4038
4949314c 4039 buf = transport_kmap_data_sg(cmd);
de103c93
CH		 4040 if (!buf)
4041 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
05d1c7c0 4042
0fd97ccf
CH		 4043 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
4044 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
4045 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
4046 buf[3] = (dev->t10_pr.pr_generation & 0xff);
c66ac9db 4047
dba66c15
NB		 4048 spin_lock(&dev->dev_reservation_lock);
4049 if (dev->dev_pr_res_holder) {
4050 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
4051
4052 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
4053 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
4054 all_reg = true;
4055 pr_res_type = pr_holder->pr_res_type;
4056 pr_res_scope = pr_holder->pr_res_scope;
4057 }
4058 }
4059 spin_unlock(&dev->dev_reservation_lock);
4060
c66ac9db
NB		 4061 spin_lock(&pr_tmpl->registration_lock);
4062 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4063 &pr_tmpl->registration_list, pr_reg_list) {
4064
4065 se_nacl = pr_reg->pr_reg_nacl;
4066 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4067 add_desc_len = 0;
4068
4069 atomic_inc(&pr_reg->pr_res_holders);
4070 smp_mb__after_atomic_inc();
4071 spin_unlock(&pr_tmpl->registration_lock);
4072 /*
4073 * Determine expected length of $FABRIC_MOD specific
4074 * TransportID full status descriptor..
4075 */
e3d6f909 4076 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
c66ac9db
NB		 4077 se_tpg, se_nacl, pr_reg, &format_code);
4078
4079 if ((exp_desc_len + add_len) > cmd->data_length) {
6708bb27 4080 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
c66ac9db
NB		 4081 " out of buffer: %d\n", cmd->data_length);
4082 spin_lock(&pr_tmpl->registration_lock);
4083 atomic_dec(&pr_reg->pr_res_holders);
4084 smp_mb__after_atomic_dec();
4085 break;
4086 }
4087 /*
4088 * Set RESERVATION KEY
4089 */
4090 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4091 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4092 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4093 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4094 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4095 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4096 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4097 buf[off++] = (pr_reg->pr_res_key & 0xff);
4098 off += 4; /* Skip Over Reserved area */
4099
4100 /*
4101 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4102 */
4103 if (pr_reg->pr_reg_all_tg_pt)
4104 buf[off] = 0x02;
4105 /*
4106 * The struct se_lun pointer will be present for the
4107 * reservation holder for PR_HOLDER bit.
4108 *
4109 * Also, if this registration is the reservation
dba66c15
NB		 4110 * holder or there is an All Registrants reservation
4111 * active, fill in SCOPE and TYPE in the next byte.
c66ac9db
NB		 4112 */
4113 if (pr_reg->pr_res_holder) {
4114 buf[off++] |= 0x01;
4115 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4116 (pr_reg->pr_res_type & 0x0f);
dba66c15
NB		 4117 } else if (all_reg) {
4118 buf[off++] |= 0x01;
4119 buf[off++] = (pr_res_scope & 0xf0) |
4120 (pr_res_type & 0x0f);
4121 } else {
c66ac9db 4122 off += 2;
dba66c15 4123 }
c66ac9db
NB		 4124
4125 off += 4; /* Skip over reserved area */
4126 /*
4127 * From spc4r17 6.3.15:
4128 *
4129 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4130 * IDENTIFIER field contains the relative port identifier (see
4131 * 3.1.120) of the target port that is part of the I_T nexus
4132 * described by this full status descriptor. If the ALL_TG_PT
4133 * bit is set to one, the contents of the RELATIVE TARGET PORT
4134 * IDENTIFIER field are not defined by this standard.
4135 */
6708bb27 4136 if (!pr_reg->pr_reg_all_tg_pt) {
c66ac9db
NB		 4137 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4138
4139 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4140 buf[off++] = (port->sep_rtpi & 0xff);
4141 } else
35d1efe8 4142 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
c66ac9db
NB		 4143
4144 /*
4145 * Now, have the $FABRIC_MOD fill in the protocol identifier
4146 */
e3d6f909 4147 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
c66ac9db
NB		 4148 se_nacl, pr_reg, &format_code, &buf[off+4]);
4149
4150 spin_lock(&pr_tmpl->registration_lock);
4151 atomic_dec(&pr_reg->pr_res_holders);
4152 smp_mb__after_atomic_dec();
4153 /*
4154 * Set the ADDITIONAL DESCRIPTOR LENGTH
4155 */
4156 buf[off++] = ((desc_len >> 24) & 0xff);
4157 buf[off++] = ((desc_len >> 16) & 0xff);
4158 buf[off++] = ((desc_len >> 8) & 0xff);
4159 buf[off++] = (desc_len & 0xff);
4160 /*
4161 * Size of full desctipor header minus TransportID
4162 * containing $FABRIC_MOD specific) initiator device/port
4163 * WWN information.
4164 *
4165 * See spc4r17 Section 6.13.5 Table 169
4166 */
4167 add_desc_len = (24 + desc_len);
4168
4169 off += desc_len;
4170 add_len += add_desc_len;
4171 }
4172 spin_unlock(&pr_tmpl->registration_lock);
4173 /*
4174 * Set ADDITIONAL_LENGTH
4175 */
4176 buf[4] = ((add_len >> 24) & 0xff);
4177 buf[5] = ((add_len >> 16) & 0xff);
4178 buf[6] = ((add_len >> 8) & 0xff);
4179 buf[7] = (add_len & 0xff);
4180
4949314c 4181 transport_kunmap_data_sg(cmd);
05d1c7c0 4182
c66ac9db
NB		 4183 return 0;
4184}
4185
de103c93
CH		 4186sense_reason_t
4187target_scsi3_emulate_pr_in(struct se_cmd *cmd)
c66ac9db 4188{
de103c93 4189 sense_reason_t ret;
e76a35d6 4190
c66ac9db
NB		 4191 /*
4192 * Following spc2r20 5.5.1 Reservations overview:
4193 *
4194 * If a logical unit has been reserved by any RESERVE command and is
4195 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4196 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4197 * initiator or service action and shall terminate with a RESERVATION
4198 * CONFLICT status.
4199 */
0fd97ccf 4200 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
6708bb27 4201 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
c66ac9db
NB		 4202 " SPC-2 reservation is held, returning"
4203 " RESERVATION_CONFLICT\n");
de103c93 4204 return TCM_RESERVATION_CONFLICT;
c66ac9db
NB		 4205 }
4206
617c0e06
CH		 4207 switch (cmd->t_task_cdb[1] & 0x1f) {
4208 case PRI_READ_KEYS:
d29a5b6a
CH		 4209 ret = core_scsi3_pri_read_keys(cmd);
4210 break;
617c0e06 4211 case PRI_READ_RESERVATION:
d29a5b6a
CH		 4212 ret = core_scsi3_pri_read_reservation(cmd);
4213 break;
617c0e06 4214 case PRI_REPORT_CAPABILITIES:
d29a5b6a
CH		 4215 ret = core_scsi3_pri_report_capabilities(cmd);
4216 break;
617c0e06 4217 case PRI_READ_FULL_STATUS:
d29a5b6a
CH		 4218 ret = core_scsi3_pri_read_full_status(cmd);
4219 break;
617c0e06
CH		 4220 default:
4221 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4222 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
de103c93 4223 return TCM_INVALID_CDB_FIELD;
d29a5b6a
CH		 4224 }
4225
6bb35e00
CH		 4226 if (!ret)
4227 target_complete_cmd(cmd, GOOD);
d29a5b6a 4228 return ret;
c66ac9db
NB		 4229}
4230
de103c93
CH		 4231sense_reason_t
4232target_check_reservation(struct se_cmd *cmd)
c66ac9db 4233{
d977f437 4234 struct se_device *dev = cmd->se_dev;
de103c93 4235 sense_reason_t ret;
c66ac9db 4236
d977f437
CH		 4237 if (!cmd->se_sess)
4238 return 0;
4239 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4240 return 0;
4241 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4242 return 0;
c66ac9db 4243
d977f437
CH		 4244 spin_lock(&dev->dev_reservation_lock);
4245 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4246 ret = target_scsi2_reservation_check(cmd);
4247 else
4248 ret = target_scsi3_pr_reservation_check(cmd);
4249 spin_unlock(&dev->dev_reservation_lock);
0fd97ccf 4250
d977f437 4251 return ret;
c66ac9db 4252}
kernel source for telekom puls (alcatel/mediatek)