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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / target / target_core_pr.c
blob0c4f783f924c450efcd82bf91a71027cbf60e508
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 *
7 * Copyright (c) 2009, 2010 Rising Tide Systems
8 * Copyright (c) 2009, 2010 Linux-iSCSI.org
9 *
10 * Nicholas A. Bellinger <nab@kernel.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 *
26 ******************************************************************************/
27
28 #include <linux/slab.h>
29 #include <linux/spinlock.h>
30 #include <linux/list.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_device.h>
37 #include <target/target_core_tmr.h>
38 #include <target/target_core_tpg.h>
39 #include <target/target_core_transport.h>
40 #include <target/target_core_fabric_ops.h>
41 #include <target/target_core_configfs.h>
42
43 #include "target_core_hba.h"
44 #include "target_core_pr.h"
45 #include "target_core_ua.h"
46
47 /*
48 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
49 */
50 struct pr_transport_id_holder {
51 int dest_local_nexus;
52 struct t10_pr_registration *dest_pr_reg;
53 struct se_portal_group *dest_tpg;
54 struct se_node_acl *dest_node_acl;
55 struct se_dev_entry *dest_se_deve;
56 struct list_head dest_list;
57 };
58
59 int core_pr_dump_initiator_port(
60 struct t10_pr_registration *pr_reg,
61 char *buf,
62 u32 size)
63 {
64 if (!pr_reg->isid_present_at_reg)
65 return 0;
66
67 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
68 return 1;
69 }
70
71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
72 struct t10_pr_registration *, int);
73
74 static int core_scsi2_reservation_seq_non_holder(
75 struct se_cmd *cmd,
76 unsigned char *cdb,
77 u32 pr_reg_type)
78 {
79 switch (cdb[0]) {
80 case INQUIRY:
81 case RELEASE:
82 case RELEASE_10:
83 return 0;
84 default:
85 return 1;
86 }
87
88 return 1;
89 }
90
91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
92 {
93 struct se_device *dev = cmd->se_dev;
94 struct se_session *sess = cmd->se_sess;
95 int ret;
96
97 if (!sess)
98 return 0;
99
100 spin_lock(&dev->dev_reservation_lock);
101 if (!dev->dev_reserved_node_acl || !sess) {
102 spin_unlock(&dev->dev_reservation_lock);
103 return 0;
104 }
105 if (dev->dev_reserved_node_acl != sess->se_node_acl) {
106 spin_unlock(&dev->dev_reservation_lock);
107 return -EINVAL;
108 }
109 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
110 spin_unlock(&dev->dev_reservation_lock);
111 return 0;
112 }
113 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
114 spin_unlock(&dev->dev_reservation_lock);
115
116 return ret;
117 }
118
119 static int core_scsi2_reservation_release(struct se_cmd *cmd)
120 {
121 struct se_device *dev = cmd->se_dev;
122 struct se_session *sess = cmd->se_sess;
123 struct se_portal_group *tpg = sess->se_tpg;
124
125 if (!sess || !tpg)
126 return 0;
127
128 spin_lock(&dev->dev_reservation_lock);
129 if (!dev->dev_reserved_node_acl || !sess) {
130 spin_unlock(&dev->dev_reservation_lock);
131 return 0;
132 }
133
134 if (dev->dev_reserved_node_acl != sess->se_node_acl) {
135 spin_unlock(&dev->dev_reservation_lock);
136 return 0;
137 }
138 dev->dev_reserved_node_acl = NULL;
139 dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
140 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
141 dev->dev_res_bin_isid = 0;
142 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
143 }
144 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
145 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
146 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
147 sess->se_node_acl->initiatorname);
148 spin_unlock(&dev->dev_reservation_lock);
149
150 return 0;
151 }
152
153 static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
154 {
155 struct se_device *dev = cmd->se_dev;
156 struct se_session *sess = cmd->se_sess;
157 struct se_portal_group *tpg = sess->se_tpg;
158
159 if ((cmd->t_task_cdb[1] & 0x01) &&
160 (cmd->t_task_cdb[1] & 0x02)) {
161 pr_err("LongIO and Obselete Bits set, returning"
162 " ILLEGAL_REQUEST\n");
163 return PYX_TRANSPORT_ILLEGAL_REQUEST;
164 }
165 /*
166 * This is currently the case for target_core_mod passthrough struct se_cmd
167 * ops
168 */
169 if (!sess || !tpg)
170 return 0;
171
172 spin_lock(&dev->dev_reservation_lock);
173 if (dev->dev_reserved_node_acl &&
174 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
175 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
176 tpg->se_tpg_tfo->get_fabric_name());
177 pr_err("Original reserver LUN: %u %s\n",
178 cmd->se_lun->unpacked_lun,
179 dev->dev_reserved_node_acl->initiatorname);
180 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
181 " from %s \n", cmd->se_lun->unpacked_lun,
182 cmd->se_deve->mapped_lun,
183 sess->se_node_acl->initiatorname);
184 spin_unlock(&dev->dev_reservation_lock);
185 return PYX_TRANSPORT_RESERVATION_CONFLICT;
186 }
187
188 dev->dev_reserved_node_acl = sess->se_node_acl;
189 dev->dev_flags |= DF_SPC2_RESERVATIONS;
190 if (sess->sess_bin_isid != 0) {
191 dev->dev_res_bin_isid = sess->sess_bin_isid;
192 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
193 }
194 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
195 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
196 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
197 sess->se_node_acl->initiatorname);
198 spin_unlock(&dev->dev_reservation_lock);
199
200 return 0;
201 }
202
203 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
204 struct se_node_acl *, struct se_session *);
205 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
206
207 /*
208 * Setup in target_core_transport.c:transport_generic_cmd_sequencer()
209 * and called via struct se_cmd->transport_emulate_cdb() in TCM processing
210 * thread context.
211 */
212 int core_scsi2_emulate_crh(struct se_cmd *cmd)
213 {
214 struct se_session *se_sess = cmd->se_sess;
215 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
216 struct t10_pr_registration *pr_reg;
217 struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
218 unsigned char *cdb = &cmd->t_task_cdb[0];
219 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
220 int conflict = 0;
221
222 if (!se_sess)
223 return 0;
224
225 if (!crh)
226 goto after_crh;
227
228 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
229 se_sess);
230 if (pr_reg) {
231 /*
232 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
233 * behavior
234 *
235 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
236 * status, but no reservation shall be established and the
237 * persistent reservation shall not be changed, if the command
238 * is received from a) and b) below.
239 *
240 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
241 * status, but the persistent reservation shall not be released,
242 * if the command is received from a) and b)
243 *
244 * a) An I_T nexus that is a persistent reservation holder; or
245 * b) An I_T nexus that is registered if a registrants only or
246 * all registrants type persistent reservation is present.
247 *
248 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
249 * RELEASE(6) command, or RELEASE(10) command shall be processed
250 * as defined in SPC-2.
251 */
252 if (pr_reg->pr_res_holder) {
253 core_scsi3_put_pr_reg(pr_reg);
254 return 0;
255 }
256 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
257 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
258 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
259 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
260 core_scsi3_put_pr_reg(pr_reg);
261 return 0;
262 }
263 core_scsi3_put_pr_reg(pr_reg);
264 conflict = 1;
265 } else {
266 /*
267 * Following spc2r20 5.5.1 Reservations overview:
268 *
269 * If a logical unit has executed a PERSISTENT RESERVE OUT
270 * command with the REGISTER or the REGISTER AND IGNORE
271 * EXISTING KEY service action and is still registered by any
272 * initiator, all RESERVE commands and all RELEASE commands
273 * regardless of initiator shall conflict and shall terminate
274 * with a RESERVATION CONFLICT status.
275 */
276 spin_lock(&pr_tmpl->registration_lock);
277 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
278 spin_unlock(&pr_tmpl->registration_lock);
279 }
280
281 if (conflict) {
282 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
283 " while active SPC-3 registrations exist,"
284 " returning RESERVATION_CONFLICT\n");
285 return PYX_TRANSPORT_RESERVATION_CONFLICT;
286 }
287
288 after_crh:
289 if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10))
290 return core_scsi2_reservation_reserve(cmd);
291 else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10))
292 return core_scsi2_reservation_release(cmd);
293 else
294 return PYX_TRANSPORT_INVALID_CDB_FIELD;
295 }
296
297 /*
298 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
299 *
300 * This function is called by those initiator ports who are *NOT*
301 * the active PR reservation holder when a reservation is present.
302 */
303 static int core_scsi3_pr_seq_non_holder(
304 struct se_cmd *cmd,
305 unsigned char *cdb,
306 u32 pr_reg_type)
307 {
308 struct se_dev_entry *se_deve;
309 struct se_session *se_sess = cmd->se_sess;
310 int other_cdb = 0, ignore_reg;
311 int registered_nexus = 0, ret = 1; /* Conflict by default */
312 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
313 int we = 0; /* Write Exclusive */
314 int legacy = 0; /* Act like a legacy device and return
315 * RESERVATION CONFLICT on some CDBs */
316 /*
317 * A legacy SPC-2 reservation is being held.
318 */
319 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
320 return core_scsi2_reservation_seq_non_holder(cmd,
321 cdb, pr_reg_type);
322
323 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
324 /*
325 * Determine if the registration should be ignored due to
326 * non-matching ISIDs in core_scsi3_pr_reservation_check().
327 */
328 ignore_reg = (pr_reg_type & 0x80000000);
329 if (ignore_reg)
330 pr_reg_type &= ~0x80000000;
331
332 switch (pr_reg_type) {
333 case PR_TYPE_WRITE_EXCLUSIVE:
334 we = 1;
335 case PR_TYPE_EXCLUSIVE_ACCESS:
336 /*
337 * Some commands are only allowed for the persistent reservation
338 * holder.
339 */
340 if ((se_deve->def_pr_registered) && !(ignore_reg))
341 registered_nexus = 1;
342 break;
343 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
344 we = 1;
345 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
346 /*
347 * Some commands are only allowed for registered I_T Nexuses.
348 */
349 reg_only = 1;
350 if ((se_deve->def_pr_registered) && !(ignore_reg))
351 registered_nexus = 1;
352 break;
353 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
354 we = 1;
355 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
356 /*
357 * Each registered I_T Nexus is a reservation holder.
358 */
359 all_reg = 1;
360 if ((se_deve->def_pr_registered) && !(ignore_reg))
361 registered_nexus = 1;
362 break;
363 default:
364 return -EINVAL;
365 }
366 /*
367 * Referenced from spc4r17 table 45 for *NON* PR holder access
368 */
369 switch (cdb[0]) {
370 case SECURITY_PROTOCOL_IN:
371 if (registered_nexus)
372 return 0;
373 ret = (we) ? 0 : 1;
374 break;
375 case MODE_SENSE:
376 case MODE_SENSE_10:
377 case READ_ATTRIBUTE:
378 case READ_BUFFER:
379 case RECEIVE_DIAGNOSTIC:
380 if (legacy) {
381 ret = 1;
382 break;
383 }
384 if (registered_nexus) {
385 ret = 0;
386 break;
387 }
388 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
389 break;
390 case PERSISTENT_RESERVE_OUT:
391 /*
392 * This follows PERSISTENT_RESERVE_OUT service actions that
393 * are allowed in the presence of various reservations.
394 * See spc4r17, table 46
395 */
396 switch (cdb[1] & 0x1f) {
397 case PRO_CLEAR:
398 case PRO_PREEMPT:
399 case PRO_PREEMPT_AND_ABORT:
400 ret = (registered_nexus) ? 0 : 1;
401 break;
402 case PRO_REGISTER:
403 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
404 ret = 0;
405 break;
406 case PRO_REGISTER_AND_MOVE:
407 case PRO_RESERVE:
408 ret = 1;
409 break;
410 case PRO_RELEASE:
411 ret = (registered_nexus) ? 0 : 1;
412 break;
413 default:
414 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
415 " action: 0x%02x\n", cdb[1] & 0x1f);
416 return -EINVAL;
417 }
418 break;
419 case RELEASE:
420 case RELEASE_10:
421 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
422 ret = 0;
423 break;
424 case RESERVE:
425 case RESERVE_10:
426 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
427 ret = 0;
428 break;
429 case TEST_UNIT_READY:
430 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
431 break;
432 case MAINTENANCE_IN:
433 switch (cdb[1] & 0x1f) {
434 case MI_MANAGEMENT_PROTOCOL_IN:
435 if (registered_nexus) {
436 ret = 0;
437 break;
438 }
439 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
440 break;
441 case MI_REPORT_SUPPORTED_OPERATION_CODES:
442 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
443 if (legacy) {
444 ret = 1;
445 break;
446 }
447 if (registered_nexus) {
448 ret = 0;
449 break;
450 }
451 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
452 break;
453 case MI_REPORT_ALIASES:
454 case MI_REPORT_IDENTIFYING_INFORMATION:
455 case MI_REPORT_PRIORITY:
456 case MI_REPORT_TARGET_PGS:
457 case MI_REPORT_TIMESTAMP:
458 ret = 0; /* Allowed */
459 break;
460 default:
461 pr_err("Unknown MI Service Action: 0x%02x\n",
462 (cdb[1] & 0x1f));
463 return -EINVAL;
464 }
465 break;
466 case ACCESS_CONTROL_IN:
467 case ACCESS_CONTROL_OUT:
468 case INQUIRY:
469 case LOG_SENSE:
470 case READ_MEDIA_SERIAL_NUMBER:
471 case REPORT_LUNS:
472 case REQUEST_SENSE:
473 ret = 0; /*/ Allowed CDBs */
474 break;
475 default:
476 other_cdb = 1;
477 break;
478 }
479 /*
480 * Case where the CDB is explicitly allowed in the above switch
481 * statement.
482 */
483 if (!ret && !other_cdb) {
484 #if 0
485 pr_debug("Allowing explict CDB: 0x%02x for %s"
486 " reservation holder\n", cdb[0],
487 core_scsi3_pr_dump_type(pr_reg_type));
488 #endif
489 return ret;
490 }
491 /*
492 * Check if write exclusive initiator ports *NOT* holding the
493 * WRITE_EXCLUSIVE_* reservation.
494 */
495 if ((we) && !(registered_nexus)) {
496 if (cmd->data_direction == DMA_TO_DEVICE) {
497 /*
498 * Conflict for write exclusive
499 */
500 pr_debug("%s Conflict for unregistered nexus"
501 " %s CDB: 0x%02x to %s reservation\n",
502 transport_dump_cmd_direction(cmd),
503 se_sess->se_node_acl->initiatorname, cdb[0],
504 core_scsi3_pr_dump_type(pr_reg_type));
505 return 1;
506 } else {
507 /*
508 * Allow non WRITE CDBs for all Write Exclusive
509 * PR TYPEs to pass for registered and
510 * non-registered_nexuxes NOT holding the reservation.
511 *
512 * We only make noise for the unregisterd nexuses,
513 * as we expect registered non-reservation holding
514 * nexuses to issue CDBs.
515 */
516 #if 0
517 if (!registered_nexus) {
518 pr_debug("Allowing implict CDB: 0x%02x"
519 " for %s reservation on unregistered"
520 " nexus\n", cdb[0],
521 core_scsi3_pr_dump_type(pr_reg_type));
522 }
523 #endif
524 return 0;
525 }
526 } else if ((reg_only) || (all_reg)) {
527 if (registered_nexus) {
528 /*
529 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
530 * allow commands from registered nexuses.
531 */
532 #if 0
533 pr_debug("Allowing implict CDB: 0x%02x for %s"
534 " reservation\n", cdb[0],
535 core_scsi3_pr_dump_type(pr_reg_type));
536 #endif
537 return 0;
538 }
539 }
540 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
541 " for %s reservation\n", transport_dump_cmd_direction(cmd),
542 (registered_nexus) ? "" : "un",
543 se_sess->se_node_acl->initiatorname, cdb[0],
544 core_scsi3_pr_dump_type(pr_reg_type));
545
546 return 1; /* Conflict by default */
547 }
548
549 static u32 core_scsi3_pr_generation(struct se_device *dev)
550 {
551 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
552 u32 prg;
553 /*
554 * PRGeneration field shall contain the value of a 32-bit wrapping
555 * counter mainted by the device server.
556 *
557 * Note that this is done regardless of Active Persist across
558 * Target PowerLoss (APTPL)
559 *
560 * See spc4r17 section 6.3.12 READ_KEYS service action
561 */
562 spin_lock(&dev->dev_reservation_lock);
563 prg = su_dev->t10_pr.pr_generation++;
564 spin_unlock(&dev->dev_reservation_lock);
565
566 return prg;
567 }
568
569 static int core_scsi3_pr_reservation_check(
570 struct se_cmd *cmd,
571 u32 *pr_reg_type)
572 {
573 struct se_device *dev = cmd->se_dev;
574 struct se_session *sess = cmd->se_sess;
575 int ret;
576
577 if (!sess)
578 return 0;
579 /*
580 * A legacy SPC-2 reservation is being held.
581 */
582 if (dev->dev_flags & DF_SPC2_RESERVATIONS)
583 return core_scsi2_reservation_check(cmd, pr_reg_type);
584
585 spin_lock(&dev->dev_reservation_lock);
586 if (!dev->dev_pr_res_holder) {
587 spin_unlock(&dev->dev_reservation_lock);
588 return 0;
589 }
590 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
591 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
592 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
593 spin_unlock(&dev->dev_reservation_lock);
594 return -EINVAL;
595 }
596 if (!dev->dev_pr_res_holder->isid_present_at_reg) {
597 spin_unlock(&dev->dev_reservation_lock);
598 return 0;
599 }
600 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
601 sess->sess_bin_isid) ? 0 : -EINVAL;
602 /*
603 * Use bit in *pr_reg_type to notify ISID mismatch in
604 * core_scsi3_pr_seq_non_holder().
605 */
606 if (ret != 0)
607 *pr_reg_type |= 0x80000000;
608 spin_unlock(&dev->dev_reservation_lock);
609
610 return ret;
611 }
612
613 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
614 struct se_device *dev,
615 struct se_node_acl *nacl,
616 struct se_dev_entry *deve,
617 unsigned char *isid,
618 u64 sa_res_key,
619 int all_tg_pt,
620 int aptpl)
621 {
622 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
623 struct t10_pr_registration *pr_reg;
624
625 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
626 if (!pr_reg) {
627 pr_err("Unable to allocate struct t10_pr_registration\n");
628 return NULL;
629 }
630
631 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
632 GFP_ATOMIC);
633 if (!pr_reg->pr_aptpl_buf) {
634 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
635 kmem_cache_free(t10_pr_reg_cache, pr_reg);
636 return NULL;
637 }
638
639 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
640 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
641 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
642 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
643 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
644 atomic_set(&pr_reg->pr_res_holders, 0);
645 pr_reg->pr_reg_nacl = nacl;
646 pr_reg->pr_reg_deve = deve;
647 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
648 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
649 pr_reg->pr_res_key = sa_res_key;
650 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
651 pr_reg->pr_reg_aptpl = aptpl;
652 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
653 /*
654 * If an ISID value for this SCSI Initiator Port exists,
655 * save it to the registration now.
656 */
657 if (isid != NULL) {
658 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
659 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
660 pr_reg->isid_present_at_reg = 1;
661 }
662
663 return pr_reg;
664 }
665
666 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
667 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
668
669 /*
670 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
671 * modes.
672 */
673 static struct t10_pr_registration *__core_scsi3_alloc_registration(
674 struct se_device *dev,
675 struct se_node_acl *nacl,
676 struct se_dev_entry *deve,
677 unsigned char *isid,
678 u64 sa_res_key,
679 int all_tg_pt,
680 int aptpl)
681 {
682 struct se_dev_entry *deve_tmp;
683 struct se_node_acl *nacl_tmp;
684 struct se_port *port, *port_tmp;
685 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
686 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
687 int ret;
688 /*
689 * Create a registration for the I_T Nexus upon which the
690 * PROUT REGISTER was received.
691 */
692 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
693 sa_res_key, all_tg_pt, aptpl);
694 if (!pr_reg)
695 return NULL;
696 /*
697 * Return pointer to pr_reg for ALL_TG_PT=0
698 */
699 if (!all_tg_pt)
700 return pr_reg;
701 /*
702 * Create list of matching SCSI Initiator Port registrations
703 * for ALL_TG_PT=1
704 */
705 spin_lock(&dev->se_port_lock);
706 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
707 atomic_inc(&port->sep_tg_pt_ref_cnt);
708 smp_mb__after_atomic_inc();
709 spin_unlock(&dev->se_port_lock);
710
711 spin_lock_bh(&port->sep_alua_lock);
712 list_for_each_entry(deve_tmp, &port->sep_alua_list,
713 alua_port_list) {
714 /*
715 * This pointer will be NULL for demo mode MappedLUNs
716 * that have not been make explict via a ConfigFS
717 * MappedLUN group for the SCSI Initiator Node ACL.
718 */
719 if (!deve_tmp->se_lun_acl)
720 continue;
721
722 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
723 /*
724 * Skip the matching struct se_node_acl that is allocated
725 * above..
726 */
727 if (nacl == nacl_tmp)
728 continue;
729 /*
730 * Only perform PR registrations for target ports on
731 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
732 * arrived.
733 */
734 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
735 continue;
736 /*
737 * Look for a matching Initiator Node ACL in ASCII format
738 */
739 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
740 continue;
741
742 atomic_inc(&deve_tmp->pr_ref_count);
743 smp_mb__after_atomic_inc();
744 spin_unlock_bh(&port->sep_alua_lock);
745 /*
746 * Grab a configfs group dependency that is released
747 * for the exception path at label out: below, or upon
748 * completion of adding ALL_TG_PT=1 registrations in
749 * __core_scsi3_add_registration()
750 */
751 ret = core_scsi3_lunacl_depend_item(deve_tmp);
752 if (ret < 0) {
753 pr_err("core_scsi3_lunacl_depend"
754 "_item() failed\n");
755 atomic_dec(&port->sep_tg_pt_ref_cnt);
756 smp_mb__after_atomic_dec();
757 atomic_dec(&deve_tmp->pr_ref_count);
758 smp_mb__after_atomic_dec();
759 goto out;
760 }
761 /*
762 * Located a matching SCSI Initiator Port on a different
763 * port, allocate the pr_reg_atp and attach it to the
764 * pr_reg->pr_reg_atp_list that will be processed once
765 * the original *pr_reg is processed in
766 * __core_scsi3_add_registration()
767 */
768 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
769 nacl_tmp, deve_tmp, NULL,
770 sa_res_key, all_tg_pt, aptpl);
771 if (!pr_reg_atp) {
772 atomic_dec(&port->sep_tg_pt_ref_cnt);
773 smp_mb__after_atomic_dec();
774 atomic_dec(&deve_tmp->pr_ref_count);
775 smp_mb__after_atomic_dec();
776 core_scsi3_lunacl_undepend_item(deve_tmp);
777 goto out;
778 }
779
780 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
781 &pr_reg->pr_reg_atp_list);
782 spin_lock_bh(&port->sep_alua_lock);
783 }
784 spin_unlock_bh(&port->sep_alua_lock);
785
786 spin_lock(&dev->se_port_lock);
787 atomic_dec(&port->sep_tg_pt_ref_cnt);
788 smp_mb__after_atomic_dec();
789 }
790 spin_unlock(&dev->se_port_lock);
791
792 return pr_reg;
793 out:
794 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
795 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
796 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
797 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
798 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
799 }
800 kmem_cache_free(t10_pr_reg_cache, pr_reg);
801 return NULL;
802 }
803
804 int core_scsi3_alloc_aptpl_registration(
805 struct t10_reservation *pr_tmpl,
806 u64 sa_res_key,
807 unsigned char *i_port,
808 unsigned char *isid,
809 u32 mapped_lun,
810 unsigned char *t_port,
811 u16 tpgt,
812 u32 target_lun,
813 int res_holder,
814 int all_tg_pt,
815 u8 type)
816 {
817 struct t10_pr_registration *pr_reg;
818
819 if (!i_port || !t_port || !sa_res_key) {
820 pr_err("Illegal parameters for APTPL registration\n");
821 return -EINVAL;
822 }
823
824 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
825 if (!pr_reg) {
826 pr_err("Unable to allocate struct t10_pr_registration\n");
827 return -ENOMEM;
828 }
829 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
830
831 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
832 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
833 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
834 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
835 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
836 atomic_set(&pr_reg->pr_res_holders, 0);
837 pr_reg->pr_reg_nacl = NULL;
838 pr_reg->pr_reg_deve = NULL;
839 pr_reg->pr_res_mapped_lun = mapped_lun;
840 pr_reg->pr_aptpl_target_lun = target_lun;
841 pr_reg->pr_res_key = sa_res_key;
842 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
843 pr_reg->pr_reg_aptpl = 1;
844 pr_reg->pr_reg_tg_pt_lun = NULL;
845 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
846 pr_reg->pr_res_type = type;
847 /*
848 * If an ISID value had been saved in APTPL metadata for this
849 * SCSI Initiator Port, restore it now.
850 */
851 if (isid != NULL) {
852 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
853 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
854 pr_reg->isid_present_at_reg = 1;
855 }
856 /*
857 * Copy the i_port and t_port information from caller.
858 */
859 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
860 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
861 pr_reg->pr_reg_tpgt = tpgt;
862 /*
863 * Set pr_res_holder from caller, the pr_reg who is the reservation
864 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
865 * the Initiator Node LUN ACL from the fabric module is created for
866 * this registration.
867 */
868 pr_reg->pr_res_holder = res_holder;
869
870 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
871 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
872 " metadata\n", (res_holder) ? "+reservation" : "");
873 return 0;
874 }
875
876 static void core_scsi3_aptpl_reserve(
877 struct se_device *dev,
878 struct se_portal_group *tpg,
879 struct se_node_acl *node_acl,
880 struct t10_pr_registration *pr_reg)
881 {
882 char i_buf[PR_REG_ISID_ID_LEN];
883 int prf_isid;
884
885 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
886 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
887 PR_REG_ISID_ID_LEN);
888
889 spin_lock(&dev->dev_reservation_lock);
890 dev->dev_pr_res_holder = pr_reg;
891 spin_unlock(&dev->dev_reservation_lock);
892
893 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
894 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
895 tpg->se_tpg_tfo->get_fabric_name(),
896 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
897 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
898 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
899 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
900 (prf_isid) ? &i_buf[0] : "");
901 }
902
903 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
904 struct t10_pr_registration *, int, int);
905
906 static int __core_scsi3_check_aptpl_registration(
907 struct se_device *dev,
908 struct se_portal_group *tpg,
909 struct se_lun *lun,
910 u32 target_lun,
911 struct se_node_acl *nacl,
912 struct se_dev_entry *deve)
913 {
914 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
915 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
916 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
917 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
918 u16 tpgt;
919
920 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
921 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
922 /*
923 * Copy Initiator Port information from struct se_node_acl
924 */
925 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
926 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
927 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
928 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
929 /*
930 * Look for the matching registrations+reservation from those
931 * created from APTPL metadata. Note that multiple registrations
932 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
933 * TransportIDs.
934 */
935 spin_lock(&pr_tmpl->aptpl_reg_lock);
936 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
937 pr_reg_aptpl_list) {
938 if (!strcmp(pr_reg->pr_iport, i_port) &&
939 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
940 !(strcmp(pr_reg->pr_tport, t_port)) &&
941 (pr_reg->pr_reg_tpgt == tpgt) &&
942 (pr_reg->pr_aptpl_target_lun == target_lun)) {
943
944 pr_reg->pr_reg_nacl = nacl;
945 pr_reg->pr_reg_deve = deve;
946 pr_reg->pr_reg_tg_pt_lun = lun;
947
948 list_del(&pr_reg->pr_reg_aptpl_list);
949 spin_unlock(&pr_tmpl->aptpl_reg_lock);
950 /*
951 * At this point all of the pointers in *pr_reg will
952 * be setup, so go ahead and add the registration.
953 */
954
955 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
956 /*
957 * If this registration is the reservation holder,
958 * make that happen now..
959 */
960 if (pr_reg->pr_res_holder)
961 core_scsi3_aptpl_reserve(dev, tpg,
962 nacl, pr_reg);
963 /*
964 * Reenable pr_aptpl_active to accept new metadata
965 * updates once the SCSI device is active again..
966 */
967 spin_lock(&pr_tmpl->aptpl_reg_lock);
968 pr_tmpl->pr_aptpl_active = 1;
969 }
970 }
971 spin_unlock(&pr_tmpl->aptpl_reg_lock);
972
973 return 0;
974 }
975
976 int core_scsi3_check_aptpl_registration(
977 struct se_device *dev,
978 struct se_portal_group *tpg,
979 struct se_lun *lun,
980 struct se_lun_acl *lun_acl)
981 {
982 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
983 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
984 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
985
986 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
987 return 0;
988
989 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
990 lun->unpacked_lun, nacl, deve);
991 }
992
993 static void __core_scsi3_dump_registration(
994 struct target_core_fabric_ops *tfo,
995 struct se_device *dev,
996 struct se_node_acl *nacl,
997 struct t10_pr_registration *pr_reg,
998 int register_type)
999 {
1000 struct se_portal_group *se_tpg = nacl->se_tpg;
1001 char i_buf[PR_REG_ISID_ID_LEN];
1002 int prf_isid;
1003
1004 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1005 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1006 PR_REG_ISID_ID_LEN);
1007
1008 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1009 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1010 "_AND_MOVE" : (register_type == 1) ?
1011 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1012 (prf_isid) ? i_buf : "");
1013 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1014 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1015 tfo->tpg_get_tag(se_tpg));
1016 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1017 " Port(s)\n", tfo->get_fabric_name(),
1018 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1019 dev->transport->name);
1020 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1021 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1022 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1023 pr_reg->pr_reg_aptpl);
1024 }
1025
1026 /*
1027 * this function can be called with struct se_device->dev_reservation_lock
1028 * when register_move = 1
1029 */
1030 static void __core_scsi3_add_registration(
1031 struct se_device *dev,
1032 struct se_node_acl *nacl,
1033 struct t10_pr_registration *pr_reg,
1034 int register_type,
1035 int register_move)
1036 {
1037 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1038 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1039 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1040 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1041
1042 /*
1043 * Increment PRgeneration counter for struct se_device upon a successful
1044 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1045 *
1046 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1047 * action, the struct se_device->dev_reservation_lock will already be held,
1048 * so we do not call core_scsi3_pr_generation() which grabs the lock
1049 * for the REGISTER.
1050 */
1051 pr_reg->pr_res_generation = (register_move) ?
1052 su_dev->t10_pr.pr_generation++ :
1053 core_scsi3_pr_generation(dev);
1054
1055 spin_lock(&pr_tmpl->registration_lock);
1056 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1057 pr_reg->pr_reg_deve->def_pr_registered = 1;
1058
1059 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1060 spin_unlock(&pr_tmpl->registration_lock);
1061 /*
1062 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1063 */
1064 if (!pr_reg->pr_reg_all_tg_pt || register_move)
1065 return;
1066 /*
1067 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1068 * allocated in __core_scsi3_alloc_registration()
1069 */
1070 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1071 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1072 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1073
1074 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1075
1076 spin_lock(&pr_tmpl->registration_lock);
1077 list_add_tail(&pr_reg_tmp->pr_reg_list,
1078 &pr_tmpl->registration_list);
1079 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1080
1081 __core_scsi3_dump_registration(tfo, dev,
1082 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1083 register_type);
1084 spin_unlock(&pr_tmpl->registration_lock);
1085 /*
1086 * Drop configfs group dependency reference from
1087 * __core_scsi3_alloc_registration()
1088 */
1089 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1090 }
1091 }
1092
1093 static int core_scsi3_alloc_registration(
1094 struct se_device *dev,
1095 struct se_node_acl *nacl,
1096 struct se_dev_entry *deve,
1097 unsigned char *isid,
1098 u64 sa_res_key,
1099 int all_tg_pt,
1100 int aptpl,
1101 int register_type,
1102 int register_move)
1103 {
1104 struct t10_pr_registration *pr_reg;
1105
1106 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1107 sa_res_key, all_tg_pt, aptpl);
1108 if (!pr_reg)
1109 return -EPERM;
1110
1111 __core_scsi3_add_registration(dev, nacl, pr_reg,
1112 register_type, register_move);
1113 return 0;
1114 }
1115
1116 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1117 struct se_device *dev,
1118 struct se_node_acl *nacl,
1119 unsigned char *isid)
1120 {
1121 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1122 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1123 struct se_portal_group *tpg;
1124
1125 spin_lock(&pr_tmpl->registration_lock);
1126 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1127 &pr_tmpl->registration_list, pr_reg_list) {
1128 /*
1129 * First look for a matching struct se_node_acl
1130 */
1131 if (pr_reg->pr_reg_nacl != nacl)
1132 continue;
1133
1134 tpg = pr_reg->pr_reg_nacl->se_tpg;
1135 /*
1136 * If this registration does NOT contain a fabric provided
1137 * ISID, then we have found a match.
1138 */
1139 if (!pr_reg->isid_present_at_reg) {
1140 /*
1141 * Determine if this SCSI device server requires that
1142 * SCSI Intiatior TransportID w/ ISIDs is enforced
1143 * for fabric modules (iSCSI) requiring them.
1144 */
1145 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1146 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1147 continue;
1148 }
1149 atomic_inc(&pr_reg->pr_res_holders);
1150 smp_mb__after_atomic_inc();
1151 spin_unlock(&pr_tmpl->registration_lock);
1152 return pr_reg;
1153 }
1154 /*
1155 * If the *pr_reg contains a fabric defined ISID for multi-value
1156 * SCSI Initiator Port TransportIDs, then we expect a valid
1157 * matching ISID to be provided by the local SCSI Initiator Port.
1158 */
1159 if (!isid)
1160 continue;
1161 if (strcmp(isid, pr_reg->pr_reg_isid))
1162 continue;
1163
1164 atomic_inc(&pr_reg->pr_res_holders);
1165 smp_mb__after_atomic_inc();
1166 spin_unlock(&pr_tmpl->registration_lock);
1167 return pr_reg;
1168 }
1169 spin_unlock(&pr_tmpl->registration_lock);
1170
1171 return NULL;
1172 }
1173
1174 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1175 struct se_device *dev,
1176 struct se_node_acl *nacl,
1177 struct se_session *sess)
1178 {
1179 struct se_portal_group *tpg = nacl->se_tpg;
1180 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1181
1182 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1183 memset(&buf[0], 0, PR_REG_ISID_LEN);
1184 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1185 PR_REG_ISID_LEN);
1186 isid_ptr = &buf[0];
1187 }
1188
1189 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1190 }
1191
1192 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1193 {
1194 atomic_dec(&pr_reg->pr_res_holders);
1195 smp_mb__after_atomic_dec();
1196 }
1197
1198 static int core_scsi3_check_implict_release(
1199 struct se_device *dev,
1200 struct t10_pr_registration *pr_reg)
1201 {
1202 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1203 struct t10_pr_registration *pr_res_holder;
1204 int ret = 0;
1205
1206 spin_lock(&dev->dev_reservation_lock);
1207 pr_res_holder = dev->dev_pr_res_holder;
1208 if (!pr_res_holder) {
1209 spin_unlock(&dev->dev_reservation_lock);
1210 return ret;
1211 }
1212 if (pr_res_holder == pr_reg) {
1213 /*
1214 * Perform an implict RELEASE if the registration that
1215 * is being released is holding the reservation.
1216 *
1217 * From spc4r17, section 5.7.11.1:
1218 *
1219 * e) If the I_T nexus is the persistent reservation holder
1220 * and the persistent reservation is not an all registrants
1221 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1222 * service action or REGISTER AND IGNORE EXISTING KEY
1223 * service action with the SERVICE ACTION RESERVATION KEY
1224 * field set to zero (see 5.7.11.3).
1225 */
1226 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1227 ret = 1;
1228 /*
1229 * For 'All Registrants' reservation types, all existing
1230 * registrations are still processed as reservation holders
1231 * in core_scsi3_pr_seq_non_holder() after the initial
1232 * reservation holder is implictly released here.
1233 */
1234 } else if (pr_reg->pr_reg_all_tg_pt &&
1235 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1236 pr_reg->pr_reg_nacl->initiatorname)) &&
1237 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1238 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1239 " UNREGISTER while existing reservation with matching"
1240 " key 0x%016Lx is present from another SCSI Initiator"
1241 " Port\n", pr_reg->pr_res_key);
1242 ret = -EPERM;
1243 }
1244 spin_unlock(&dev->dev_reservation_lock);
1245
1246 return ret;
1247 }
1248
1249 /*
1250 * Called with struct t10_reservation->registration_lock held.
1251 */
1252 static void __core_scsi3_free_registration(
1253 struct se_device *dev,
1254 struct t10_pr_registration *pr_reg,
1255 struct list_head *preempt_and_abort_list,
1256 int dec_holders)
1257 {
1258 struct target_core_fabric_ops *tfo =
1259 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1260 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1261 char i_buf[PR_REG_ISID_ID_LEN];
1262 int prf_isid;
1263
1264 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1265 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1266 PR_REG_ISID_ID_LEN);
1267
1268 pr_reg->pr_reg_deve->def_pr_registered = 0;
1269 pr_reg->pr_reg_deve->pr_res_key = 0;
1270 list_del(&pr_reg->pr_reg_list);
1271 /*
1272 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1273 * so call core_scsi3_put_pr_reg() to decrement our reference.
1274 */
1275 if (dec_holders)
1276 core_scsi3_put_pr_reg(pr_reg);
1277 /*
1278 * Wait until all reference from any other I_T nexuses for this
1279 * *pr_reg have been released. Because list_del() is called above,
1280 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1281 * count back to zero, and we release *pr_reg.
1282 */
1283 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1284 spin_unlock(&pr_tmpl->registration_lock);
1285 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1286 tfo->get_fabric_name());
1287 cpu_relax();
1288 spin_lock(&pr_tmpl->registration_lock);
1289 }
1290
1291 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1292 " Node: %s%s\n", tfo->get_fabric_name(),
1293 pr_reg->pr_reg_nacl->initiatorname,
1294 (prf_isid) ? &i_buf[0] : "");
1295 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1296 " Port(s)\n", tfo->get_fabric_name(),
1297 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1298 dev->transport->name);
1299 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1300 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1301 pr_reg->pr_res_generation);
1302
1303 if (!preempt_and_abort_list) {
1304 pr_reg->pr_reg_deve = NULL;
1305 pr_reg->pr_reg_nacl = NULL;
1306 kfree(pr_reg->pr_aptpl_buf);
1307 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1308 return;
1309 }
1310 /*
1311 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1312 * are released once the ABORT_TASK_SET has completed..
1313 */
1314 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1315 }
1316
1317 void core_scsi3_free_pr_reg_from_nacl(
1318 struct se_device *dev,
1319 struct se_node_acl *nacl)
1320 {
1321 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1322 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323 /*
1324 * If the passed se_node_acl matches the reservation holder,
1325 * release the reservation.
1326 */
1327 spin_lock(&dev->dev_reservation_lock);
1328 pr_res_holder = dev->dev_pr_res_holder;
1329 if ((pr_res_holder != NULL) &&
1330 (pr_res_holder->pr_reg_nacl == nacl))
1331 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1332 spin_unlock(&dev->dev_reservation_lock);
1333 /*
1334 * Release any registration associated with the struct se_node_acl.
1335 */
1336 spin_lock(&pr_tmpl->registration_lock);
1337 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1338 &pr_tmpl->registration_list, pr_reg_list) {
1339
1340 if (pr_reg->pr_reg_nacl != nacl)
1341 continue;
1342
1343 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1344 }
1345 spin_unlock(&pr_tmpl->registration_lock);
1346 }
1347
1348 void core_scsi3_free_all_registrations(
1349 struct se_device *dev)
1350 {
1351 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1352 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1353
1354 spin_lock(&dev->dev_reservation_lock);
1355 pr_res_holder = dev->dev_pr_res_holder;
1356 if (pr_res_holder != NULL) {
1357 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1358 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1359 pr_res_holder, 0);
1360 }
1361 spin_unlock(&dev->dev_reservation_lock);
1362
1363 spin_lock(&pr_tmpl->registration_lock);
1364 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1365 &pr_tmpl->registration_list, pr_reg_list) {
1366
1367 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1368 }
1369 spin_unlock(&pr_tmpl->registration_lock);
1370
1371 spin_lock(&pr_tmpl->aptpl_reg_lock);
1372 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1373 pr_reg_aptpl_list) {
1374 list_del(&pr_reg->pr_reg_aptpl_list);
1375 kfree(pr_reg->pr_aptpl_buf);
1376 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1377 }
1378 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1379 }
1380
1381 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1382 {
1383 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1384 &tpg->tpg_group.cg_item);
1385 }
1386
1387 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1388 {
1389 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1390 &tpg->tpg_group.cg_item);
1391
1392 atomic_dec(&tpg->tpg_pr_ref_count);
1393 smp_mb__after_atomic_dec();
1394 }
1395
1396 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1397 {
1398 struct se_portal_group *tpg = nacl->se_tpg;
1399
1400 if (nacl->dynamic_node_acl)
1401 return 0;
1402
1403 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1404 &nacl->acl_group.cg_item);
1405 }
1406
1407 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1408 {
1409 struct se_portal_group *tpg = nacl->se_tpg;
1410
1411 if (nacl->dynamic_node_acl) {
1412 atomic_dec(&nacl->acl_pr_ref_count);
1413 smp_mb__after_atomic_dec();
1414 return;
1415 }
1416
1417 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1418 &nacl->acl_group.cg_item);
1419
1420 atomic_dec(&nacl->acl_pr_ref_count);
1421 smp_mb__after_atomic_dec();
1422 }
1423
1424 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1425 {
1426 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1427 struct se_node_acl *nacl;
1428 struct se_portal_group *tpg;
1429 /*
1430 * For nacl->dynamic_node_acl=1
1431 */
1432 if (!lun_acl)
1433 return 0;
1434
1435 nacl = lun_acl->se_lun_nacl;
1436 tpg = nacl->se_tpg;
1437
1438 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1439 &lun_acl->se_lun_group.cg_item);
1440 }
1441
1442 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1443 {
1444 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1445 struct se_node_acl *nacl;
1446 struct se_portal_group *tpg;
1447 /*
1448 * For nacl->dynamic_node_acl=1
1449 */
1450 if (!lun_acl) {
1451 atomic_dec(&se_deve->pr_ref_count);
1452 smp_mb__after_atomic_dec();
1453 return;
1454 }
1455 nacl = lun_acl->se_lun_nacl;
1456 tpg = nacl->se_tpg;
1457
1458 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1459 &lun_acl->se_lun_group.cg_item);
1460
1461 atomic_dec(&se_deve->pr_ref_count);
1462 smp_mb__after_atomic_dec();
1463 }
1464
1465 static int core_scsi3_decode_spec_i_port(
1466 struct se_cmd *cmd,
1467 struct se_portal_group *tpg,
1468 unsigned char *l_isid,
1469 u64 sa_res_key,
1470 int all_tg_pt,
1471 int aptpl)
1472 {
1473 struct se_device *dev = cmd->se_dev;
1474 struct se_port *tmp_port;
1475 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1476 struct se_session *se_sess = cmd->se_sess;
1477 struct se_node_acl *dest_node_acl = NULL;
1478 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1479 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1480 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1481 struct list_head tid_dest_list;
1482 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1483 struct target_core_fabric_ops *tmp_tf_ops;
1484 unsigned char *buf;
1485 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1486 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1487 u32 tpdl, tid_len = 0;
1488 int ret, dest_local_nexus, prf_isid;
1489 u32 dest_rtpi = 0;
1490
1491 memset(dest_iport, 0, 64);
1492 INIT_LIST_HEAD(&tid_dest_list);
1493
1494 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1495 /*
1496 * Allocate a struct pr_transport_id_holder and setup the
1497 * local_node_acl and local_se_deve pointers and add to
1498 * struct list_head tid_dest_list for add registration
1499 * processing in the loop of tid_dest_list below.
1500 */
1501 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1502 if (!tidh_new) {
1503 pr_err("Unable to allocate tidh_new\n");
1504 return PYX_TRANSPORT_LU_COMM_FAILURE;
1505 }
1506 INIT_LIST_HEAD(&tidh_new->dest_list);
1507 tidh_new->dest_tpg = tpg;
1508 tidh_new->dest_node_acl = se_sess->se_node_acl;
1509 tidh_new->dest_se_deve = local_se_deve;
1510
1511 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1512 se_sess->se_node_acl, local_se_deve, l_isid,
1513 sa_res_key, all_tg_pt, aptpl);
1514 if (!local_pr_reg) {
1515 kfree(tidh_new);
1516 return PYX_TRANSPORT_LU_COMM_FAILURE;
1517 }
1518 tidh_new->dest_pr_reg = local_pr_reg;
1519 /*
1520 * The local I_T nexus does not hold any configfs dependances,
1521 * so we set tid_h->dest_local_nexus=1 to prevent the
1522 * configfs_undepend_item() calls in the tid_dest_list loops below.
1523 */
1524 tidh_new->dest_local_nexus = 1;
1525 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1526
1527 buf = transport_kmap_first_data_page(cmd);
1528 /*
1529 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1530 * first extract TransportID Parameter Data Length, and make sure
1531 * the value matches up to the SCSI expected data transfer length.
1532 */
1533 tpdl = (buf[24] & 0xff) << 24;
1534 tpdl |= (buf[25] & 0xff) << 16;
1535 tpdl |= (buf[26] & 0xff) << 8;
1536 tpdl |= buf[27] & 0xff;
1537
1538 if ((tpdl + 28) != cmd->data_length) {
1539 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1540 " does not equal CDB data_length: %u\n", tpdl,
1541 cmd->data_length);
1542 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1543 goto out;
1544 }
1545 /*
1546 * Start processing the received transport IDs using the
1547 * receiving I_T Nexus portal's fabric dependent methods to
1548 * obtain the SCSI Initiator Port/Device Identifiers.
1549 */
1550 ptr = &buf[28];
1551
1552 while (tpdl > 0) {
1553 proto_ident = (ptr[0] & 0x0f);
1554 dest_tpg = NULL;
1555
1556 spin_lock(&dev->se_port_lock);
1557 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1558 tmp_tpg = tmp_port->sep_tpg;
1559 if (!tmp_tpg)
1560 continue;
1561 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1562 if (!tmp_tf_ops)
1563 continue;
1564 if (!tmp_tf_ops->get_fabric_proto_ident ||
1565 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1566 continue;
1567 /*
1568 * Look for the matching proto_ident provided by
1569 * the received TransportID
1570 */
1571 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1572 if (tmp_proto_ident != proto_ident)
1573 continue;
1574 dest_rtpi = tmp_port->sep_rtpi;
1575
1576 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1577 tmp_tpg, (const char *)ptr, &tid_len,
1578 &iport_ptr);
1579 if (!i_str)
1580 continue;
1581
1582 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1583 smp_mb__after_atomic_inc();
1584 spin_unlock(&dev->se_port_lock);
1585
1586 ret = core_scsi3_tpg_depend_item(tmp_tpg);
1587 if (ret != 0) {
1588 pr_err(" core_scsi3_tpg_depend_item()"
1589 " for tmp_tpg\n");
1590 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1591 smp_mb__after_atomic_dec();
1592 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1593 goto out;
1594 }
1595 /*
1596 * Locate the desination initiator ACL to be registered
1597 * from the decoded fabric module specific TransportID
1598 * at *i_str.
1599 */
1600 spin_lock_irq(&tmp_tpg->acl_node_lock);
1601 dest_node_acl = __core_tpg_get_initiator_node_acl(
1602 tmp_tpg, i_str);
1603 if (dest_node_acl) {
1604 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1605 smp_mb__after_atomic_inc();
1606 }
1607 spin_unlock_irq(&tmp_tpg->acl_node_lock);
1608
1609 if (!dest_node_acl) {
1610 core_scsi3_tpg_undepend_item(tmp_tpg);
1611 spin_lock(&dev->se_port_lock);
1612 continue;
1613 }
1614
1615 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1616 if (ret != 0) {
1617 pr_err("configfs_depend_item() failed"
1618 " for dest_node_acl->acl_group\n");
1619 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1620 smp_mb__after_atomic_dec();
1621 core_scsi3_tpg_undepend_item(tmp_tpg);
1622 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1623 goto out;
1624 }
1625
1626 dest_tpg = tmp_tpg;
1627 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1628 " %s Port RTPI: %hu\n",
1629 dest_tpg->se_tpg_tfo->get_fabric_name(),
1630 dest_node_acl->initiatorname, dest_rtpi);
1631
1632 spin_lock(&dev->se_port_lock);
1633 break;
1634 }
1635 spin_unlock(&dev->se_port_lock);
1636
1637 if (!dest_tpg) {
1638 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1639 " dest_tpg\n");
1640 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1641 goto out;
1642 }
1643 #if 0
1644 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1645 " tid_len: %d for %s + %s\n",
1646 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1647 tpdl, tid_len, i_str, iport_ptr);
1648 #endif
1649 if (tid_len > tpdl) {
1650 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1651 " %u for Transport ID: %s\n", tid_len, ptr);
1652 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1653 core_scsi3_tpg_undepend_item(dest_tpg);
1654 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1655 goto out;
1656 }
1657 /*
1658 * Locate the desintation struct se_dev_entry pointer for matching
1659 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1660 * Target Port.
1661 */
1662 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1663 dest_rtpi);
1664 if (!dest_se_deve) {
1665 pr_err("Unable to locate %s dest_se_deve"
1666 " from destination RTPI: %hu\n",
1667 dest_tpg->se_tpg_tfo->get_fabric_name(),
1668 dest_rtpi);
1669
1670 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1671 core_scsi3_tpg_undepend_item(dest_tpg);
1672 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1673 goto out;
1674 }
1675
1676 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1677 if (ret < 0) {
1678 pr_err("core_scsi3_lunacl_depend_item()"
1679 " failed\n");
1680 atomic_dec(&dest_se_deve->pr_ref_count);
1681 smp_mb__after_atomic_dec();
1682 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1683 core_scsi3_tpg_undepend_item(dest_tpg);
1684 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1685 goto out;
1686 }
1687 #if 0
1688 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1689 " dest_se_deve mapped_lun: %u\n",
1690 dest_tpg->se_tpg_tfo->get_fabric_name(),
1691 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1692 #endif
1693 /*
1694 * Skip any TransportIDs that already have a registration for
1695 * this target port.
1696 */
1697 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1698 iport_ptr);
1699 if (pr_reg_e) {
1700 core_scsi3_put_pr_reg(pr_reg_e);
1701 core_scsi3_lunacl_undepend_item(dest_se_deve);
1702 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1703 core_scsi3_tpg_undepend_item(dest_tpg);
1704 ptr += tid_len;
1705 tpdl -= tid_len;
1706 tid_len = 0;
1707 continue;
1708 }
1709 /*
1710 * Allocate a struct pr_transport_id_holder and setup
1711 * the dest_node_acl and dest_se_deve pointers for the
1712 * loop below.
1713 */
1714 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1715 GFP_KERNEL);
1716 if (!tidh_new) {
1717 pr_err("Unable to allocate tidh_new\n");
1718 core_scsi3_lunacl_undepend_item(dest_se_deve);
1719 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720 core_scsi3_tpg_undepend_item(dest_tpg);
1721 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1722 goto out;
1723 }
1724 INIT_LIST_HEAD(&tidh_new->dest_list);
1725 tidh_new->dest_tpg = dest_tpg;
1726 tidh_new->dest_node_acl = dest_node_acl;
1727 tidh_new->dest_se_deve = dest_se_deve;
1728
1729 /*
1730 * Allocate, but do NOT add the registration for the
1731 * TransportID referenced SCSI Initiator port. This
1732 * done because of the following from spc4r17 in section
1733 * 6.14.3 wrt SPEC_I_PT:
1734 *
1735 * "If a registration fails for any initiator port (e.g., if th
1736 * logical unit does not have enough resources available to
1737 * hold the registration information), no registrations shall be
1738 * made, and the command shall be terminated with
1739 * CHECK CONDITION status."
1740 *
1741 * That means we call __core_scsi3_alloc_registration() here,
1742 * and then call __core_scsi3_add_registration() in the
1743 * 2nd loop which will never fail.
1744 */
1745 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1746 dest_node_acl, dest_se_deve, iport_ptr,
1747 sa_res_key, all_tg_pt, aptpl);
1748 if (!dest_pr_reg) {
1749 core_scsi3_lunacl_undepend_item(dest_se_deve);
1750 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1751 core_scsi3_tpg_undepend_item(dest_tpg);
1752 kfree(tidh_new);
1753 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1754 goto out;
1755 }
1756 tidh_new->dest_pr_reg = dest_pr_reg;
1757 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1758
1759 ptr += tid_len;
1760 tpdl -= tid_len;
1761 tid_len = 0;
1762
1763 }
1764
1765 transport_kunmap_first_data_page(cmd);
1766
1767 /*
1768 * Go ahead and create a registrations from tid_dest_list for the
1769 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1770 * and dest_se_deve.
1771 *
1772 * The SA Reservation Key from the PROUT is set for the
1773 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1774 * means that the TransportID Initiator port will be
1775 * registered on all of the target ports in the SCSI target device
1776 * ALL_TG_PT=0 means the registration will only be for the
1777 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1778 * was received.
1779 */
1780 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1781 dest_tpg = tidh->dest_tpg;
1782 dest_node_acl = tidh->dest_node_acl;
1783 dest_se_deve = tidh->dest_se_deve;
1784 dest_pr_reg = tidh->dest_pr_reg;
1785 dest_local_nexus = tidh->dest_local_nexus;
1786
1787 list_del(&tidh->dest_list);
1788 kfree(tidh);
1789
1790 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1791 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1792 PR_REG_ISID_ID_LEN);
1793
1794 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1795 dest_pr_reg, 0, 0);
1796
1797 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1798 " registered Transport ID for Node: %s%s Mapped LUN:"
1799 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1800 dest_node_acl->initiatorname, (prf_isid) ?
1801 &i_buf[0] : "", dest_se_deve->mapped_lun);
1802
1803 if (dest_local_nexus)
1804 continue;
1805
1806 core_scsi3_lunacl_undepend_item(dest_se_deve);
1807 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1808 core_scsi3_tpg_undepend_item(dest_tpg);
1809 }
1810
1811 return 0;
1812 out:
1813 transport_kunmap_first_data_page(cmd);
1814 /*
1815 * For the failure case, release everything from tid_dest_list
1816 * including *dest_pr_reg and the configfs dependances..
1817 */
1818 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1819 dest_tpg = tidh->dest_tpg;
1820 dest_node_acl = tidh->dest_node_acl;
1821 dest_se_deve = tidh->dest_se_deve;
1822 dest_pr_reg = tidh->dest_pr_reg;
1823 dest_local_nexus = tidh->dest_local_nexus;
1824
1825 list_del(&tidh->dest_list);
1826 kfree(tidh);
1827 /*
1828 * Release any extra ALL_TG_PT=1 registrations for
1829 * the SPEC_I_PT=1 case.
1830 */
1831 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1832 &dest_pr_reg->pr_reg_atp_list,
1833 pr_reg_atp_mem_list) {
1834 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1835 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1836 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1837 }
1838
1839 kfree(dest_pr_reg->pr_aptpl_buf);
1840 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1841
1842 if (dest_local_nexus)
1843 continue;
1844
1845 core_scsi3_lunacl_undepend_item(dest_se_deve);
1846 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1847 core_scsi3_tpg_undepend_item(dest_tpg);
1848 }
1849 return ret;
1850 }
1851
1852 /*
1853 * Called with struct se_device->dev_reservation_lock held
1854 */
1855 static int __core_scsi3_update_aptpl_buf(
1856 struct se_device *dev,
1857 unsigned char *buf,
1858 u32 pr_aptpl_buf_len,
1859 int clear_aptpl_metadata)
1860 {
1861 struct se_lun *lun;
1862 struct se_portal_group *tpg;
1863 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1864 struct t10_pr_registration *pr_reg;
1865 unsigned char tmp[512], isid_buf[32];
1866 ssize_t len = 0;
1867 int reg_count = 0;
1868
1869 memset(buf, 0, pr_aptpl_buf_len);
1870 /*
1871 * Called to clear metadata once APTPL has been deactivated.
1872 */
1873 if (clear_aptpl_metadata) {
1874 snprintf(buf, pr_aptpl_buf_len,
1875 "No Registrations or Reservations\n");
1876 return 0;
1877 }
1878 /*
1879 * Walk the registration list..
1880 */
1881 spin_lock(&su_dev->t10_pr.registration_lock);
1882 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1883 pr_reg_list) {
1884
1885 tmp[0] = '\0';
1886 isid_buf[0] = '\0';
1887 tpg = pr_reg->pr_reg_nacl->se_tpg;
1888 lun = pr_reg->pr_reg_tg_pt_lun;
1889 /*
1890 * Write out any ISID value to APTPL metadata that was included
1891 * in the original registration.
1892 */
1893 if (pr_reg->isid_present_at_reg)
1894 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1895 pr_reg->pr_reg_isid);
1896 /*
1897 * Include special metadata if the pr_reg matches the
1898 * reservation holder.
1899 */
1900 if (dev->dev_pr_res_holder == pr_reg) {
1901 snprintf(tmp, 512, "PR_REG_START: %d"
1902 "\ninitiator_fabric=%s\n"
1903 "initiator_node=%s\n%s"
1904 "sa_res_key=%llu\n"
1905 "res_holder=1\nres_type=%02x\n"
1906 "res_scope=%02x\nres_all_tg_pt=%d\n"
1907 "mapped_lun=%u\n", reg_count,
1908 tpg->se_tpg_tfo->get_fabric_name(),
1909 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1910 pr_reg->pr_res_key, pr_reg->pr_res_type,
1911 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1912 pr_reg->pr_res_mapped_lun);
1913 } else {
1914 snprintf(tmp, 512, "PR_REG_START: %d\n"
1915 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1916 "sa_res_key=%llu\nres_holder=0\n"
1917 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1918 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1919 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1920 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1921 pr_reg->pr_res_mapped_lun);
1922 }
1923
1924 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1925 pr_err("Unable to update renaming"
1926 " APTPL metadata\n");
1927 spin_unlock(&su_dev->t10_pr.registration_lock);
1928 return -EMSGSIZE;
1929 }
1930 len += sprintf(buf+len, "%s", tmp);
1931
1932 /*
1933 * Include information about the associated SCSI target port.
1934 */
1935 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1936 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1937 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1938 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1939 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1940 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1941
1942 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1943 pr_err("Unable to update renaming"
1944 " APTPL metadata\n");
1945 spin_unlock(&su_dev->t10_pr.registration_lock);
1946 return -EMSGSIZE;
1947 }
1948 len += sprintf(buf+len, "%s", tmp);
1949 reg_count++;
1950 }
1951 spin_unlock(&su_dev->t10_pr.registration_lock);
1952
1953 if (!reg_count)
1954 len += sprintf(buf+len, "No Registrations or Reservations");
1955
1956 return 0;
1957 }
1958
1959 static int core_scsi3_update_aptpl_buf(
1960 struct se_device *dev,
1961 unsigned char *buf,
1962 u32 pr_aptpl_buf_len,
1963 int clear_aptpl_metadata)
1964 {
1965 int ret;
1966
1967 spin_lock(&dev->dev_reservation_lock);
1968 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1969 clear_aptpl_metadata);
1970 spin_unlock(&dev->dev_reservation_lock);
1971
1972 return ret;
1973 }
1974
1975 /*
1976 * Called with struct se_device->aptpl_file_mutex held
1977 */
1978 static int __core_scsi3_write_aptpl_to_file(
1979 struct se_device *dev,
1980 unsigned char *buf,
1981 u32 pr_aptpl_buf_len)
1982 {
1983 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1984 struct file *file;
1985 struct iovec iov[1];
1986 mm_segment_t old_fs;
1987 int flags = O_RDWR | O_CREAT | O_TRUNC;
1988 char path[512];
1989 int ret;
1990
1991 memset(iov, 0, sizeof(struct iovec));
1992 memset(path, 0, 512);
1993
1994 if (strlen(&wwn->unit_serial[0]) >= 512) {
1995 pr_err("WWN value for struct se_device does not fit"
1996 " into path buffer\n");
1997 return -EMSGSIZE;
1998 }
1999
2000 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2001 file = filp_open(path, flags, 0600);
2002 if (IS_ERR(file) || !file || !file->f_dentry) {
2003 pr_err("filp_open(%s) for APTPL metadata"
2004 " failed\n", path);
2005 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2006 }
2007
2008 iov[0].iov_base = &buf[0];
2009 if (!pr_aptpl_buf_len)
2010 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2011 else
2012 iov[0].iov_len = pr_aptpl_buf_len;
2013
2014 old_fs = get_fs();
2015 set_fs(get_ds());
2016 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2017 set_fs(old_fs);
2018
2019 if (ret < 0) {
2020 pr_debug("Error writing APTPL metadata file: %s\n", path);
2021 filp_close(file, NULL);
2022 return -EIO;
2023 }
2024 filp_close(file, NULL);
2025
2026 return 0;
2027 }
2028
2029 static int core_scsi3_update_and_write_aptpl(
2030 struct se_device *dev,
2031 unsigned char *in_buf,
2032 u32 in_pr_aptpl_buf_len)
2033 {
2034 unsigned char null_buf[64], *buf;
2035 u32 pr_aptpl_buf_len;
2036 int ret, clear_aptpl_metadata = 0;
2037 /*
2038 * Can be called with a NULL pointer from PROUT service action CLEAR
2039 */
2040 if (!in_buf) {
2041 memset(null_buf, 0, 64);
2042 buf = &null_buf[0];
2043 /*
2044 * This will clear the APTPL metadata to:
2045 * "No Registrations or Reservations" status
2046 */
2047 pr_aptpl_buf_len = 64;
2048 clear_aptpl_metadata = 1;
2049 } else {
2050 buf = in_buf;
2051 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2052 }
2053
2054 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2055 clear_aptpl_metadata);
2056 if (ret != 0)
2057 return ret;
2058 /*
2059 * __core_scsi3_write_aptpl_to_file() will call strlen()
2060 * on the passed buf to determine pr_aptpl_buf_len.
2061 */
2062 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2063 if (ret != 0)
2064 return ret;
2065
2066 return ret;
2067 }
2068
2069 static int core_scsi3_emulate_pro_register(
2070 struct se_cmd *cmd,
2071 u64 res_key,
2072 u64 sa_res_key,
2073 int aptpl,
2074 int all_tg_pt,
2075 int spec_i_pt,
2076 int ignore_key)
2077 {
2078 struct se_session *se_sess = cmd->se_sess;
2079 struct se_device *dev = cmd->se_dev;
2080 struct se_dev_entry *se_deve;
2081 struct se_lun *se_lun = cmd->se_lun;
2082 struct se_portal_group *se_tpg;
2083 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2084 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2085 /* Used for APTPL metadata w/ UNREGISTER */
2086 unsigned char *pr_aptpl_buf = NULL;
2087 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2088 int pr_holder = 0, ret = 0, type;
2089
2090 if (!se_sess || !se_lun) {
2091 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2092 return PYX_TRANSPORT_LU_COMM_FAILURE;
2093 }
2094 se_tpg = se_sess->se_tpg;
2095 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2096
2097 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2098 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2099 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2100 PR_REG_ISID_LEN);
2101 isid_ptr = &isid_buf[0];
2102 }
2103 /*
2104 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2105 */
2106 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2107 if (!pr_reg_e) {
2108 if (res_key) {
2109 pr_warn("SPC-3 PR: Reservation Key non-zero"
2110 " for SA REGISTER, returning CONFLICT\n");
2111 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2112 }
2113 /*
2114 * Do nothing but return GOOD status.
2115 */
2116 if (!sa_res_key)
2117 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2118
2119 if (!spec_i_pt) {
2120 /*
2121 * Perform the Service Action REGISTER on the Initiator
2122 * Port Endpoint that the PRO was received from on the
2123 * Logical Unit of the SCSI device server.
2124 */
2125 ret = core_scsi3_alloc_registration(cmd->se_dev,
2126 se_sess->se_node_acl, se_deve, isid_ptr,
2127 sa_res_key, all_tg_pt, aptpl,
2128 ignore_key, 0);
2129 if (ret != 0) {
2130 pr_err("Unable to allocate"
2131 " struct t10_pr_registration\n");
2132 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2133 }
2134 } else {
2135 /*
2136 * Register both the Initiator port that received
2137 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2138 * TransportID from Parameter list and loop through
2139 * fabric dependent parameter list while calling
2140 * logic from of core_scsi3_alloc_registration() for
2141 * each TransportID provided SCSI Initiator Port/Device
2142 */
2143 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2144 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2145 if (ret != 0)
2146 return ret;
2147 }
2148 /*
2149 * Nothing left to do for the APTPL=0 case.
2150 */
2151 if (!aptpl) {
2152 pr_tmpl->pr_aptpl_active = 0;
2153 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2154 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2155 " REGISTER\n");
2156 return 0;
2157 }
2158 /*
2159 * Locate the newly allocated local I_T Nexus *pr_reg, and
2160 * update the APTPL metadata information using its
2161 * preallocated *pr_reg->pr_aptpl_buf.
2162 */
2163 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2164 se_sess->se_node_acl, se_sess);
2165
2166 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2167 &pr_reg->pr_aptpl_buf[0],
2168 pr_tmpl->pr_aptpl_buf_len);
2169 if (!ret) {
2170 pr_tmpl->pr_aptpl_active = 1;
2171 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2172 }
2173
2174 core_scsi3_put_pr_reg(pr_reg);
2175 return ret;
2176 } else {
2177 /*
2178 * Locate the existing *pr_reg via struct se_node_acl pointers
2179 */
2180 pr_reg = pr_reg_e;
2181 type = pr_reg->pr_res_type;
2182
2183 if (!ignore_key) {
2184 if (res_key != pr_reg->pr_res_key) {
2185 pr_err("SPC-3 PR REGISTER: Received"
2186 " res_key: 0x%016Lx does not match"
2187 " existing SA REGISTER res_key:"
2188 " 0x%016Lx\n", res_key,
2189 pr_reg->pr_res_key);
2190 core_scsi3_put_pr_reg(pr_reg);
2191 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2192 }
2193 }
2194 if (spec_i_pt) {
2195 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2196 " set while sa_res_key=0\n");
2197 core_scsi3_put_pr_reg(pr_reg);
2198 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2199 }
2200 /*
2201 * An existing ALL_TG_PT=1 registration being released
2202 * must also set ALL_TG_PT=1 in the incoming PROUT.
2203 */
2204 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2205 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2206 " registration exists, but ALL_TG_PT=1 bit not"
2207 " present in received PROUT\n");
2208 core_scsi3_put_pr_reg(pr_reg);
2209 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2210 }
2211 /*
2212 * Allocate APTPL metadata buffer used for UNREGISTER ops
2213 */
2214 if (aptpl) {
2215 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2216 GFP_KERNEL);
2217 if (!pr_aptpl_buf) {
2218 pr_err("Unable to allocate"
2219 " pr_aptpl_buf\n");
2220 core_scsi3_put_pr_reg(pr_reg);
2221 return PYX_TRANSPORT_LU_COMM_FAILURE;
2222 }
2223 }
2224 /*
2225 * sa_res_key=0 Unregister Reservation Key for registered I_T
2226 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2227 * Nexus.
2228 */
2229 if (!sa_res_key) {
2230 pr_holder = core_scsi3_check_implict_release(
2231 cmd->se_dev, pr_reg);
2232 if (pr_holder < 0) {
2233 kfree(pr_aptpl_buf);
2234 core_scsi3_put_pr_reg(pr_reg);
2235 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2236 }
2237
2238 spin_lock(&pr_tmpl->registration_lock);
2239 /*
2240 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2241 * and matching pr_res_key.
2242 */
2243 if (pr_reg->pr_reg_all_tg_pt) {
2244 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2245 &pr_tmpl->registration_list,
2246 pr_reg_list) {
2247
2248 if (!pr_reg_p->pr_reg_all_tg_pt)
2249 continue;
2250
2251 if (pr_reg_p->pr_res_key != res_key)
2252 continue;
2253
2254 if (pr_reg == pr_reg_p)
2255 continue;
2256
2257 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2258 pr_reg_p->pr_reg_nacl->initiatorname))
2259 continue;
2260
2261 __core_scsi3_free_registration(dev,
2262 pr_reg_p, NULL, 0);
2263 }
2264 }
2265 /*
2266 * Release the calling I_T Nexus registration now..
2267 */
2268 __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2269 NULL, 1);
2270 /*
2271 * From spc4r17, section 5.7.11.3 Unregistering
2272 *
2273 * If the persistent reservation is a registrants only
2274 * type, the device server shall establish a unit
2275 * attention condition for the initiator port associated
2276 * with every registered I_T nexus except for the I_T
2277 * nexus on which the PERSISTENT RESERVE OUT command was
2278 * received, with the additional sense code set to
2279 * RESERVATIONS RELEASED.
2280 */
2281 if (pr_holder &&
2282 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2283 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2284 list_for_each_entry(pr_reg_p,
2285 &pr_tmpl->registration_list,
2286 pr_reg_list) {
2287
2288 core_scsi3_ua_allocate(
2289 pr_reg_p->pr_reg_nacl,
2290 pr_reg_p->pr_res_mapped_lun,
2291 0x2A,
2292 ASCQ_2AH_RESERVATIONS_RELEASED);
2293 }
2294 }
2295 spin_unlock(&pr_tmpl->registration_lock);
2296
2297 if (!aptpl) {
2298 pr_tmpl->pr_aptpl_active = 0;
2299 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2300 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2301 " for UNREGISTER\n");
2302 return 0;
2303 }
2304
2305 ret = core_scsi3_update_and_write_aptpl(dev,
2306 &pr_aptpl_buf[0],
2307 pr_tmpl->pr_aptpl_buf_len);
2308 if (!ret) {
2309 pr_tmpl->pr_aptpl_active = 1;
2310 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2311 " for UNREGISTER\n");
2312 }
2313
2314 kfree(pr_aptpl_buf);
2315 return ret;
2316 } else {
2317 /*
2318 * Increment PRgeneration counter for struct se_device"
2319 * upon a successful REGISTER, see spc4r17 section 6.3.2
2320 * READ_KEYS service action.
2321 */
2322 pr_reg->pr_res_generation = core_scsi3_pr_generation(
2323 cmd->se_dev);
2324 pr_reg->pr_res_key = sa_res_key;
2325 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2326 " Key for %s to: 0x%016Lx PRgeneration:"
2327 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2328 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2329 pr_reg->pr_reg_nacl->initiatorname,
2330 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2331
2332 if (!aptpl) {
2333 pr_tmpl->pr_aptpl_active = 0;
2334 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2335 core_scsi3_put_pr_reg(pr_reg);
2336 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2337 " for REGISTER\n");
2338 return 0;
2339 }
2340
2341 ret = core_scsi3_update_and_write_aptpl(dev,
2342 &pr_aptpl_buf[0],
2343 pr_tmpl->pr_aptpl_buf_len);
2344 if (!ret) {
2345 pr_tmpl->pr_aptpl_active = 1;
2346 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2347 " for REGISTER\n");
2348 }
2349
2350 kfree(pr_aptpl_buf);
2351 core_scsi3_put_pr_reg(pr_reg);
2352 }
2353 }
2354 return 0;
2355 }
2356
2357 unsigned char *core_scsi3_pr_dump_type(int type)
2358 {
2359 switch (type) {
2360 case PR_TYPE_WRITE_EXCLUSIVE:
2361 return "Write Exclusive Access";
2362 case PR_TYPE_EXCLUSIVE_ACCESS:
2363 return "Exclusive Access";
2364 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2365 return "Write Exclusive Access, Registrants Only";
2366 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2367 return "Exclusive Access, Registrants Only";
2368 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2369 return "Write Exclusive Access, All Registrants";
2370 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2371 return "Exclusive Access, All Registrants";
2372 default:
2373 break;
2374 }
2375
2376 return "Unknown SPC-3 PR Type";
2377 }
2378
2379 static int core_scsi3_pro_reserve(
2380 struct se_cmd *cmd,
2381 struct se_device *dev,
2382 int type,
2383 int scope,
2384 u64 res_key)
2385 {
2386 struct se_session *se_sess = cmd->se_sess;
2387 struct se_dev_entry *se_deve;
2388 struct se_lun *se_lun = cmd->se_lun;
2389 struct se_portal_group *se_tpg;
2390 struct t10_pr_registration *pr_reg, *pr_res_holder;
2391 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2392 char i_buf[PR_REG_ISID_ID_LEN];
2393 int ret, prf_isid;
2394
2395 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2396
2397 if (!se_sess || !se_lun) {
2398 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2399 return PYX_TRANSPORT_LU_COMM_FAILURE;
2400 }
2401 se_tpg = se_sess->se_tpg;
2402 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2403 /*
2404 * Locate the existing *pr_reg via struct se_node_acl pointers
2405 */
2406 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2407 se_sess);
2408 if (!pr_reg) {
2409 pr_err("SPC-3 PR: Unable to locate"
2410 " PR_REGISTERED *pr_reg for RESERVE\n");
2411 return PYX_TRANSPORT_LU_COMM_FAILURE;
2412 }
2413 /*
2414 * From spc4r17 Section 5.7.9: Reserving:
2415 *
2416 * An application client creates a persistent reservation by issuing
2417 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2418 * a registered I_T nexus with the following parameters:
2419 * a) RESERVATION KEY set to the value of the reservation key that is
2420 * registered with the logical unit for the I_T nexus; and
2421 */
2422 if (res_key != pr_reg->pr_res_key) {
2423 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2424 " does not match existing SA REGISTER res_key:"
2425 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2426 core_scsi3_put_pr_reg(pr_reg);
2427 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2428 }
2429 /*
2430 * From spc4r17 Section 5.7.9: Reserving:
2431 *
2432 * From above:
2433 * b) TYPE field and SCOPE field set to the persistent reservation
2434 * being created.
2435 *
2436 * Only one persistent reservation is allowed at a time per logical unit
2437 * and that persistent reservation has a scope of LU_SCOPE.
2438 */
2439 if (scope != PR_SCOPE_LU_SCOPE) {
2440 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2441 core_scsi3_put_pr_reg(pr_reg);
2442 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2443 }
2444 /*
2445 * See if we have an existing PR reservation holder pointer at
2446 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2447 * *pr_res_holder.
2448 */
2449 spin_lock(&dev->dev_reservation_lock);
2450 pr_res_holder = dev->dev_pr_res_holder;
2451 if ((pr_res_holder)) {
2452 /*
2453 * From spc4r17 Section 5.7.9: Reserving:
2454 *
2455 * If the device server receives a PERSISTENT RESERVE OUT
2456 * command from an I_T nexus other than a persistent reservation
2457 * holder (see 5.7.10) that attempts to create a persistent
2458 * reservation when a persistent reservation already exists for
2459 * the logical unit, then the command shall be completed with
2460 * RESERVATION CONFLICT status.
2461 */
2462 if (pr_res_holder != pr_reg) {
2463 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2464 pr_err("SPC-3 PR: Attempted RESERVE from"
2465 " [%s]: %s while reservation already held by"
2466 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2467 cmd->se_tfo->get_fabric_name(),
2468 se_sess->se_node_acl->initiatorname,
2469 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2470 pr_res_holder->pr_reg_nacl->initiatorname);
2471
2472 spin_unlock(&dev->dev_reservation_lock);
2473 core_scsi3_put_pr_reg(pr_reg);
2474 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2475 }
2476 /*
2477 * From spc4r17 Section 5.7.9: Reserving:
2478 *
2479 * If a persistent reservation holder attempts to modify the
2480 * type or scope of an existing persistent reservation, the
2481 * command shall be completed with RESERVATION CONFLICT status.
2482 */
2483 if ((pr_res_holder->pr_res_type != type) ||
2484 (pr_res_holder->pr_res_scope != scope)) {
2485 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2486 pr_err("SPC-3 PR: Attempted RESERVE from"
2487 " [%s]: %s trying to change TYPE and/or SCOPE,"
2488 " while reservation already held by [%s]: %s,"
2489 " returning RESERVATION_CONFLICT\n",
2490 cmd->se_tfo->get_fabric_name(),
2491 se_sess->se_node_acl->initiatorname,
2492 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2493 pr_res_holder->pr_reg_nacl->initiatorname);
2494
2495 spin_unlock(&dev->dev_reservation_lock);
2496 core_scsi3_put_pr_reg(pr_reg);
2497 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2498 }
2499 /*
2500 * From spc4r17 Section 5.7.9: Reserving:
2501 *
2502 * If the device server receives a PERSISTENT RESERVE OUT
2503 * command with RESERVE service action where the TYPE field and
2504 * the SCOPE field contain the same values as the existing type
2505 * and scope from a persistent reservation holder, it shall not
2506 * make any change to the existing persistent reservation and
2507 * shall completethe command with GOOD status.
2508 */
2509 spin_unlock(&dev->dev_reservation_lock);
2510 core_scsi3_put_pr_reg(pr_reg);
2511 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2512 }
2513 /*
2514 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2515 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2516 */
2517 pr_reg->pr_res_scope = scope;
2518 pr_reg->pr_res_type = type;
2519 pr_reg->pr_res_holder = 1;
2520 dev->dev_pr_res_holder = pr_reg;
2521 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2522 PR_REG_ISID_ID_LEN);
2523
2524 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2525 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2526 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2527 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2528 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2529 cmd->se_tfo->get_fabric_name(),
2530 se_sess->se_node_acl->initiatorname,
2531 (prf_isid) ? &i_buf[0] : "");
2532 spin_unlock(&dev->dev_reservation_lock);
2533
2534 if (pr_tmpl->pr_aptpl_active) {
2535 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2536 &pr_reg->pr_aptpl_buf[0],
2537 pr_tmpl->pr_aptpl_buf_len);
2538 if (!ret)
2539 pr_debug("SPC-3 PR: Updated APTPL metadata"
2540 " for RESERVE\n");
2541 }
2542
2543 core_scsi3_put_pr_reg(pr_reg);
2544 return 0;
2545 }
2546
2547 static int core_scsi3_emulate_pro_reserve(
2548 struct se_cmd *cmd,
2549 int type,
2550 int scope,
2551 u64 res_key)
2552 {
2553 struct se_device *dev = cmd->se_dev;
2554 int ret = 0;
2555
2556 switch (type) {
2557 case PR_TYPE_WRITE_EXCLUSIVE:
2558 case PR_TYPE_EXCLUSIVE_ACCESS:
2559 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2560 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2561 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2562 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2563 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2564 break;
2565 default:
2566 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2567 " 0x%02x\n", type);
2568 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2569 }
2570
2571 return ret;
2572 }
2573
2574 /*
2575 * Called with struct se_device->dev_reservation_lock held.
2576 */
2577 static void __core_scsi3_complete_pro_release(
2578 struct se_device *dev,
2579 struct se_node_acl *se_nacl,
2580 struct t10_pr_registration *pr_reg,
2581 int explict)
2582 {
2583 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2584 char i_buf[PR_REG_ISID_ID_LEN];
2585 int prf_isid;
2586
2587 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2588 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2589 PR_REG_ISID_ID_LEN);
2590 /*
2591 * Go ahead and release the current PR reservation holder.
2592 */
2593 dev->dev_pr_res_holder = NULL;
2594
2595 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2596 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2597 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2598 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2599 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2600 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2601 tfo->get_fabric_name(), se_nacl->initiatorname,
2602 (prf_isid) ? &i_buf[0] : "");
2603 /*
2604 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2605 */
2606 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2607 }
2608
2609 static int core_scsi3_emulate_pro_release(
2610 struct se_cmd *cmd,
2611 int type,
2612 int scope,
2613 u64 res_key)
2614 {
2615 struct se_device *dev = cmd->se_dev;
2616 struct se_session *se_sess = cmd->se_sess;
2617 struct se_lun *se_lun = cmd->se_lun;
2618 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2619 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2620 int ret, all_reg = 0;
2621
2622 if (!se_sess || !se_lun) {
2623 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2624 return PYX_TRANSPORT_LU_COMM_FAILURE;
2625 }
2626 /*
2627 * Locate the existing *pr_reg via struct se_node_acl pointers
2628 */
2629 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2630 if (!pr_reg) {
2631 pr_err("SPC-3 PR: Unable to locate"
2632 " PR_REGISTERED *pr_reg for RELEASE\n");
2633 return PYX_TRANSPORT_LU_COMM_FAILURE;
2634 }
2635 /*
2636 * From spc4r17 Section 5.7.11.2 Releasing:
2637 *
2638 * If there is no persistent reservation or in response to a persistent
2639 * reservation release request from a registered I_T nexus that is not a
2640 * persistent reservation holder (see 5.7.10), the device server shall
2641 * do the following:
2642 *
2643 * a) Not release the persistent reservation, if any;
2644 * b) Not remove any registrations; and
2645 * c) Complete the command with GOOD status.
2646 */
2647 spin_lock(&dev->dev_reservation_lock);
2648 pr_res_holder = dev->dev_pr_res_holder;
2649 if (!pr_res_holder) {
2650 /*
2651 * No persistent reservation, return GOOD status.
2652 */
2653 spin_unlock(&dev->dev_reservation_lock);
2654 core_scsi3_put_pr_reg(pr_reg);
2655 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2656 }
2657 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2658 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2659 all_reg = 1;
2660
2661 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2662 /*
2663 * Non 'All Registrants' PR Type cases..
2664 * Release request from a registered I_T nexus that is not a
2665 * persistent reservation holder. return GOOD status.
2666 */
2667 spin_unlock(&dev->dev_reservation_lock);
2668 core_scsi3_put_pr_reg(pr_reg);
2669 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2670 }
2671 /*
2672 * From spc4r17 Section 5.7.11.2 Releasing:
2673 *
2674 * Only the persistent reservation holder (see 5.7.10) is allowed to
2675 * release a persistent reservation.
2676 *
2677 * An application client releases the persistent reservation by issuing
2678 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2679 * an I_T nexus that is a persistent reservation holder with the
2680 * following parameters:
2681 *
2682 * a) RESERVATION KEY field set to the value of the reservation key
2683 * that is registered with the logical unit for the I_T nexus;
2684 */
2685 if (res_key != pr_reg->pr_res_key) {
2686 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2687 " does not match existing SA REGISTER res_key:"
2688 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2689 spin_unlock(&dev->dev_reservation_lock);
2690 core_scsi3_put_pr_reg(pr_reg);
2691 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2692 }
2693 /*
2694 * From spc4r17 Section 5.7.11.2 Releasing and above:
2695 *
2696 * b) TYPE field and SCOPE field set to match the persistent
2697 * reservation being released.
2698 */
2699 if ((pr_res_holder->pr_res_type != type) ||
2700 (pr_res_holder->pr_res_scope != scope)) {
2701 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2702 pr_err("SPC-3 PR RELEASE: Attempted to release"
2703 " reservation from [%s]: %s with different TYPE "
2704 "and/or SCOPE while reservation already held by"
2705 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2706 cmd->se_tfo->get_fabric_name(),
2707 se_sess->se_node_acl->initiatorname,
2708 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2709 pr_res_holder->pr_reg_nacl->initiatorname);
2710
2711 spin_unlock(&dev->dev_reservation_lock);
2712 core_scsi3_put_pr_reg(pr_reg);
2713 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2714 }
2715 /*
2716 * In response to a persistent reservation release request from the
2717 * persistent reservation holder the device server shall perform a
2718 * release by doing the following as an uninterrupted series of actions:
2719 * a) Release the persistent reservation;
2720 * b) Not remove any registration(s);
2721 * c) If the released persistent reservation is a registrants only type
2722 * or all registrants type persistent reservation,
2723 * the device server shall establish a unit attention condition for
2724 * the initiator port associated with every regis-
2725 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2726 * RESERVE OUT command with RELEASE service action was received,
2727 * with the additional sense code set to RESERVATIONS RELEASED; and
2728 * d) If the persistent reservation is of any other type, the device
2729 * server shall not establish a unit attention condition.
2730 */
2731 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2732 pr_reg, 1);
2733
2734 spin_unlock(&dev->dev_reservation_lock);
2735
2736 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2737 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2738 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2739 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2740 /*
2741 * If no UNIT ATTENTION conditions will be established for
2742 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2743 * go ahead and check for APTPL=1 update+write below
2744 */
2745 goto write_aptpl;
2746 }
2747
2748 spin_lock(&pr_tmpl->registration_lock);
2749 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2750 pr_reg_list) {
2751 /*
2752 * Do not establish a UNIT ATTENTION condition
2753 * for the calling I_T Nexus
2754 */
2755 if (pr_reg_p == pr_reg)
2756 continue;
2757
2758 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2759 pr_reg_p->pr_res_mapped_lun,
2760 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2761 }
2762 spin_unlock(&pr_tmpl->registration_lock);
2763
2764 write_aptpl:
2765 if (pr_tmpl->pr_aptpl_active) {
2766 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2767 &pr_reg->pr_aptpl_buf[0],
2768 pr_tmpl->pr_aptpl_buf_len);
2769 if (!ret)
2770 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2771 }
2772
2773 core_scsi3_put_pr_reg(pr_reg);
2774 return 0;
2775 }
2776
2777 static int core_scsi3_emulate_pro_clear(
2778 struct se_cmd *cmd,
2779 u64 res_key)
2780 {
2781 struct se_device *dev = cmd->se_dev;
2782 struct se_node_acl *pr_reg_nacl;
2783 struct se_session *se_sess = cmd->se_sess;
2784 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2785 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2786 u32 pr_res_mapped_lun = 0;
2787 int calling_it_nexus = 0;
2788 /*
2789 * Locate the existing *pr_reg via struct se_node_acl pointers
2790 */
2791 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2792 se_sess->se_node_acl, se_sess);
2793 if (!pr_reg_n) {
2794 pr_err("SPC-3 PR: Unable to locate"
2795 " PR_REGISTERED *pr_reg for CLEAR\n");
2796 return PYX_TRANSPORT_LU_COMM_FAILURE;
2797 }
2798 /*
2799 * From spc4r17 section 5.7.11.6, Clearing:
2800 *
2801 * Any application client may release the persistent reservation and
2802 * remove all registrations from a device server by issuing a
2803 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2804 * registered I_T nexus with the following parameter:
2805 *
2806 * a) RESERVATION KEY field set to the value of the reservation key
2807 * that is registered with the logical unit for the I_T nexus.
2808 */
2809 if (res_key != pr_reg_n->pr_res_key) {
2810 pr_err("SPC-3 PR REGISTER: Received"
2811 " res_key: 0x%016Lx does not match"
2812 " existing SA REGISTER res_key:"
2813 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2814 core_scsi3_put_pr_reg(pr_reg_n);
2815 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2816 }
2817 /*
2818 * a) Release the persistent reservation, if any;
2819 */
2820 spin_lock(&dev->dev_reservation_lock);
2821 pr_res_holder = dev->dev_pr_res_holder;
2822 if (pr_res_holder) {
2823 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2824 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2825 pr_res_holder, 0);
2826 }
2827 spin_unlock(&dev->dev_reservation_lock);
2828 /*
2829 * b) Remove all registration(s) (see spc4r17 5.7.7);
2830 */
2831 spin_lock(&pr_tmpl->registration_lock);
2832 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2833 &pr_tmpl->registration_list, pr_reg_list) {
2834
2835 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2836 pr_reg_nacl = pr_reg->pr_reg_nacl;
2837 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2838 __core_scsi3_free_registration(dev, pr_reg, NULL,
2839 calling_it_nexus);
2840 /*
2841 * e) Establish a unit attention condition for the initiator
2842 * port associated with every registered I_T nexus other
2843 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2844 * command with CLEAR service action was received, with the
2845 * additional sense code set to RESERVATIONS PREEMPTED.
2846 */
2847 if (!calling_it_nexus)
2848 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2849 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2850 }
2851 spin_unlock(&pr_tmpl->registration_lock);
2852
2853 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2854 cmd->se_tfo->get_fabric_name());
2855
2856 if (pr_tmpl->pr_aptpl_active) {
2857 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2858 pr_debug("SPC-3 PR: Updated APTPL metadata"
2859 " for CLEAR\n");
2860 }
2861
2862 core_scsi3_pr_generation(dev);
2863 return 0;
2864 }
2865
2866 /*
2867 * Called with struct se_device->dev_reservation_lock held.
2868 */
2869 static void __core_scsi3_complete_pro_preempt(
2870 struct se_device *dev,
2871 struct t10_pr_registration *pr_reg,
2872 struct list_head *preempt_and_abort_list,
2873 int type,
2874 int scope,
2875 int abort)
2876 {
2877 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2878 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2879 char i_buf[PR_REG_ISID_ID_LEN];
2880 int prf_isid;
2881
2882 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2883 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2884 PR_REG_ISID_ID_LEN);
2885 /*
2886 * Do an implict RELEASE of the existing reservation.
2887 */
2888 if (dev->dev_pr_res_holder)
2889 __core_scsi3_complete_pro_release(dev, nacl,
2890 dev->dev_pr_res_holder, 0);
2891
2892 dev->dev_pr_res_holder = pr_reg;
2893 pr_reg->pr_res_holder = 1;
2894 pr_reg->pr_res_type = type;
2895 pr_reg->pr_res_scope = scope;
2896
2897 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2898 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2899 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2900 core_scsi3_pr_dump_type(type),
2901 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2902 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2903 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2904 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2905 /*
2906 * For PREEMPT_AND_ABORT, add the preempting reservation's
2907 * struct t10_pr_registration to the list that will be compared
2908 * against received CDBs..
2909 */
2910 if (preempt_and_abort_list)
2911 list_add_tail(&pr_reg->pr_reg_abort_list,
2912 preempt_and_abort_list);
2913 }
2914
2915 static void core_scsi3_release_preempt_and_abort(
2916 struct list_head *preempt_and_abort_list,
2917 struct t10_pr_registration *pr_reg_holder)
2918 {
2919 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2920
2921 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2922 pr_reg_abort_list) {
2923
2924 list_del(&pr_reg->pr_reg_abort_list);
2925 if (pr_reg_holder == pr_reg)
2926 continue;
2927 if (pr_reg->pr_res_holder) {
2928 pr_warn("pr_reg->pr_res_holder still set\n");
2929 continue;
2930 }
2931
2932 pr_reg->pr_reg_deve = NULL;
2933 pr_reg->pr_reg_nacl = NULL;
2934 kfree(pr_reg->pr_aptpl_buf);
2935 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2936 }
2937 }
2938
2939 int core_scsi3_check_cdb_abort_and_preempt(
2940 struct list_head *preempt_and_abort_list,
2941 struct se_cmd *cmd)
2942 {
2943 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2944
2945 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2946 pr_reg_abort_list) {
2947 if (pr_reg->pr_res_key == cmd->pr_res_key)
2948 return 0;
2949 }
2950
2951 return 1;
2952 }
2953
2954 static int core_scsi3_pro_preempt(
2955 struct se_cmd *cmd,
2956 int type,
2957 int scope,
2958 u64 res_key,
2959 u64 sa_res_key,
2960 int abort)
2961 {
2962 struct se_device *dev = cmd->se_dev;
2963 struct se_dev_entry *se_deve;
2964 struct se_node_acl *pr_reg_nacl;
2965 struct se_session *se_sess = cmd->se_sess;
2966 struct list_head preempt_and_abort_list;
2967 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2968 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2969 u32 pr_res_mapped_lun = 0;
2970 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2971 int prh_type = 0, prh_scope = 0, ret;
2972
2973 if (!se_sess)
2974 return PYX_TRANSPORT_LU_COMM_FAILURE;
2975
2976 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2977 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2978 se_sess);
2979 if (!pr_reg_n) {
2980 pr_err("SPC-3 PR: Unable to locate"
2981 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2982 (abort) ? "_AND_ABORT" : "");
2983 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2984 }
2985 if (pr_reg_n->pr_res_key != res_key) {
2986 core_scsi3_put_pr_reg(pr_reg_n);
2987 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2988 }
2989 if (scope != PR_SCOPE_LU_SCOPE) {
2990 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2991 core_scsi3_put_pr_reg(pr_reg_n);
2992 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2993 }
2994 INIT_LIST_HEAD(&preempt_and_abort_list);
2995
2996 spin_lock(&dev->dev_reservation_lock);
2997 pr_res_holder = dev->dev_pr_res_holder;
2998 if (pr_res_holder &&
2999 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3000 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3001 all_reg = 1;
3002
3003 if (!all_reg && !sa_res_key) {
3004 spin_unlock(&dev->dev_reservation_lock);
3005 core_scsi3_put_pr_reg(pr_reg_n);
3006 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3007 }
3008 /*
3009 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3010 *
3011 * If the SERVICE ACTION RESERVATION KEY field does not identify a
3012 * persistent reservation holder or there is no persistent reservation
3013 * holder (i.e., there is no persistent reservation), then the device
3014 * server shall perform a preempt by doing the following in an
3015 * uninterrupted series of actions. (See below..)
3016 */
3017 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3018 /*
3019 * No existing or SA Reservation Key matching reservations..
3020 *
3021 * PROUT SA PREEMPT with All Registrant type reservations are
3022 * allowed to be processed without a matching SA Reservation Key
3023 */
3024 spin_lock(&pr_tmpl->registration_lock);
3025 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3026 &pr_tmpl->registration_list, pr_reg_list) {
3027 /*
3028 * Removing of registrations in non all registrants
3029 * type reservations without a matching SA reservation
3030 * key.
3031 *
3032 * a) Remove the registrations for all I_T nexuses
3033 * specified by the SERVICE ACTION RESERVATION KEY
3034 * field;
3035 * b) Ignore the contents of the SCOPE and TYPE fields;
3036 * c) Process tasks as defined in 5.7.1; and
3037 * d) Establish a unit attention condition for the
3038 * initiator port associated with every I_T nexus
3039 * that lost its registration other than the I_T
3040 * nexus on which the PERSISTENT RESERVE OUT command
3041 * was received, with the additional sense code set
3042 * to REGISTRATIONS PREEMPTED.
3043 */
3044 if (!all_reg) {
3045 if (pr_reg->pr_res_key != sa_res_key)
3046 continue;
3047
3048 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3049 pr_reg_nacl = pr_reg->pr_reg_nacl;
3050 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3051 __core_scsi3_free_registration(dev, pr_reg,
3052 (abort) ? &preempt_and_abort_list :
3053 NULL, calling_it_nexus);
3054 released_regs++;
3055 } else {
3056 /*
3057 * Case for any existing all registrants type
3058 * reservation, follow logic in spc4r17 section
3059 * 5.7.11.4 Preempting, Table 52 and Figure 7.
3060 *
3061 * For a ZERO SA Reservation key, release
3062 * all other registrations and do an implict
3063 * release of active persistent reservation.
3064 *
3065 * For a non-ZERO SA Reservation key, only
3066 * release the matching reservation key from
3067 * registrations.
3068 */
3069 if ((sa_res_key) &&
3070 (pr_reg->pr_res_key != sa_res_key))
3071 continue;
3072
3073 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3074 if (calling_it_nexus)
3075 continue;
3076
3077 pr_reg_nacl = pr_reg->pr_reg_nacl;
3078 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3079 __core_scsi3_free_registration(dev, pr_reg,
3080 (abort) ? &preempt_and_abort_list :
3081 NULL, 0);
3082 released_regs++;
3083 }
3084 if (!calling_it_nexus)
3085 core_scsi3_ua_allocate(pr_reg_nacl,
3086 pr_res_mapped_lun, 0x2A,
3087 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3088 }
3089 spin_unlock(&pr_tmpl->registration_lock);
3090 /*
3091 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3092 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3093 * RESERVATION KEY field to a value that does not match any
3094 * registered reservation key, then the device server shall
3095 * complete the command with RESERVATION CONFLICT status.
3096 */
3097 if (!released_regs) {
3098 spin_unlock(&dev->dev_reservation_lock);
3099 core_scsi3_put_pr_reg(pr_reg_n);
3100 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3101 }
3102 /*
3103 * For an existing all registrants type reservation
3104 * with a zero SA rservation key, preempt the existing
3105 * reservation with the new PR type and scope.
3106 */
3107 if (pr_res_holder && all_reg && !(sa_res_key)) {
3108 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3109 (abort) ? &preempt_and_abort_list : NULL,
3110 type, scope, abort);
3111
3112 if (abort)
3113 core_scsi3_release_preempt_and_abort(
3114 &preempt_and_abort_list, pr_reg_n);
3115 }
3116 spin_unlock(&dev->dev_reservation_lock);
3117
3118 if (pr_tmpl->pr_aptpl_active) {
3119 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3120 &pr_reg_n->pr_aptpl_buf[0],
3121 pr_tmpl->pr_aptpl_buf_len);
3122 if (!ret)
3123 pr_debug("SPC-3 PR: Updated APTPL"
3124 " metadata for PREEMPT%s\n", (abort) ?
3125 "_AND_ABORT" : "");
3126 }
3127
3128 core_scsi3_put_pr_reg(pr_reg_n);
3129 core_scsi3_pr_generation(cmd->se_dev);
3130 return 0;
3131 }
3132 /*
3133 * The PREEMPTing SA reservation key matches that of the
3134 * existing persistent reservation, first, we check if
3135 * we are preempting our own reservation.
3136 * From spc4r17, section 5.7.11.4.3 Preempting
3137 * persistent reservations and registration handling
3138 *
3139 * If an all registrants persistent reservation is not
3140 * present, it is not an error for the persistent
3141 * reservation holder to preempt itself (i.e., a
3142 * PERSISTENT RESERVE OUT with a PREEMPT service action
3143 * or a PREEMPT AND ABORT service action with the
3144 * SERVICE ACTION RESERVATION KEY value equal to the
3145 * persistent reservation holder's reservation key that
3146 * is received from the persistent reservation holder).
3147 * In that case, the device server shall establish the
3148 * new persistent reservation and maintain the
3149 * registration.
3150 */
3151 prh_type = pr_res_holder->pr_res_type;
3152 prh_scope = pr_res_holder->pr_res_scope;
3153 /*
3154 * If the SERVICE ACTION RESERVATION KEY field identifies a
3155 * persistent reservation holder (see 5.7.10), the device
3156 * server shall perform a preempt by doing the following as
3157 * an uninterrupted series of actions:
3158 *
3159 * a) Release the persistent reservation for the holder
3160 * identified by the SERVICE ACTION RESERVATION KEY field;
3161 */
3162 if (pr_reg_n != pr_res_holder)
3163 __core_scsi3_complete_pro_release(dev,
3164 pr_res_holder->pr_reg_nacl,
3165 dev->dev_pr_res_holder, 0);
3166 /*
3167 * b) Remove the registrations for all I_T nexuses identified
3168 * by the SERVICE ACTION RESERVATION KEY field, except the
3169 * I_T nexus that is being used for the PERSISTENT RESERVE
3170 * OUT command. If an all registrants persistent reservation
3171 * is present and the SERVICE ACTION RESERVATION KEY field
3172 * is set to zero, then all registrations shall be removed
3173 * except for that of the I_T nexus that is being used for
3174 * the PERSISTENT RESERVE OUT command;
3175 */
3176 spin_lock(&pr_tmpl->registration_lock);
3177 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3178 &pr_tmpl->registration_list, pr_reg_list) {
3179
3180 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3181 if (calling_it_nexus)
3182 continue;
3183
3184 if (pr_reg->pr_res_key != sa_res_key)
3185 continue;
3186
3187 pr_reg_nacl = pr_reg->pr_reg_nacl;
3188 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3189 __core_scsi3_free_registration(dev, pr_reg,
3190 (abort) ? &preempt_and_abort_list : NULL,
3191 calling_it_nexus);
3192 /*
3193 * e) Establish a unit attention condition for the initiator
3194 * port associated with every I_T nexus that lost its
3195 * persistent reservation and/or registration, with the
3196 * additional sense code set to REGISTRATIONS PREEMPTED;
3197 */
3198 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3199 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3200 }
3201 spin_unlock(&pr_tmpl->registration_lock);
3202 /*
3203 * c) Establish a persistent reservation for the preempting
3204 * I_T nexus using the contents of the SCOPE and TYPE fields;
3205 */
3206 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3207 (abort) ? &preempt_and_abort_list : NULL,
3208 type, scope, abort);
3209 /*
3210 * d) Process tasks as defined in 5.7.1;
3211 * e) See above..
3212 * f) If the type or scope has changed, then for every I_T nexus
3213 * whose reservation key was not removed, except for the I_T
3214 * nexus on which the PERSISTENT RESERVE OUT command was
3215 * received, the device server shall establish a unit
3216 * attention condition for the initiator port associated with
3217 * that I_T nexus, with the additional sense code set to
3218 * RESERVATIONS RELEASED. If the type or scope have not
3219 * changed, then no unit attention condition(s) shall be
3220 * established for this reason.
3221 */
3222 if ((prh_type != type) || (prh_scope != scope)) {
3223 spin_lock(&pr_tmpl->registration_lock);
3224 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3225 &pr_tmpl->registration_list, pr_reg_list) {
3226
3227 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3228 if (calling_it_nexus)
3229 continue;
3230
3231 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3232 pr_reg->pr_res_mapped_lun, 0x2A,
3233 ASCQ_2AH_RESERVATIONS_RELEASED);
3234 }
3235 spin_unlock(&pr_tmpl->registration_lock);
3236 }
3237 spin_unlock(&dev->dev_reservation_lock);
3238 /*
3239 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3240 * All received CDBs for the matching existing reservation and
3241 * registrations undergo ABORT_TASK logic.
3242 *
3243 * From there, core_scsi3_release_preempt_and_abort() will
3244 * release every registration in the list (which have already
3245 * been removed from the primary pr_reg list), except the
3246 * new persistent reservation holder, the calling Initiator Port.
3247 */
3248 if (abort) {
3249 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3250 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3251 pr_reg_n);
3252 }
3253
3254 if (pr_tmpl->pr_aptpl_active) {
3255 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3256 &pr_reg_n->pr_aptpl_buf[0],
3257 pr_tmpl->pr_aptpl_buf_len);
3258 if (!ret)
3259 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3260 "%s\n", (abort) ? "_AND_ABORT" : "");
3261 }
3262
3263 core_scsi3_put_pr_reg(pr_reg_n);
3264 core_scsi3_pr_generation(cmd->se_dev);
3265 return 0;
3266 }
3267
3268 static int core_scsi3_emulate_pro_preempt(
3269 struct se_cmd *cmd,
3270 int type,
3271 int scope,
3272 u64 res_key,
3273 u64 sa_res_key,
3274 int abort)
3275 {
3276 int ret = 0;
3277
3278 switch (type) {
3279 case PR_TYPE_WRITE_EXCLUSIVE:
3280 case PR_TYPE_EXCLUSIVE_ACCESS:
3281 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3282 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3283 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3284 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3285 ret = core_scsi3_pro_preempt(cmd, type, scope,
3286 res_key, sa_res_key, abort);
3287 break;
3288 default:
3289 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3290 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3291 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3292 }
3293
3294 return ret;
3295 }
3296
3297
3298 static int core_scsi3_emulate_pro_register_and_move(
3299 struct se_cmd *cmd,
3300 u64 res_key,
3301 u64 sa_res_key,
3302 int aptpl,
3303 int unreg)
3304 {
3305 struct se_session *se_sess = cmd->se_sess;
3306 struct se_device *dev = cmd->se_dev;
3307 struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3308 struct se_lun *se_lun = cmd->se_lun;
3309 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3310 struct se_port *se_port;
3311 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3312 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3313 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3314 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3315 unsigned char *buf;
3316 unsigned char *initiator_str;
3317 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3318 u32 tid_len, tmp_tid_len;
3319 int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3320 unsigned short rtpi;
3321 unsigned char proto_ident;
3322
3323 if (!se_sess || !se_lun) {
3324 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3325 return PYX_TRANSPORT_LU_COMM_FAILURE;
3326 }
3327 memset(dest_iport, 0, 64);
3328 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3329 se_tpg = se_sess->se_tpg;
3330 tf_ops = se_tpg->se_tpg_tfo;
3331 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3332 /*
3333 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3334 * Register behaviors for a REGISTER AND MOVE service action
3335 *
3336 * Locate the existing *pr_reg via struct se_node_acl pointers
3337 */
3338 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3339 se_sess);
3340 if (!pr_reg) {
3341 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3342 " *pr_reg for REGISTER_AND_MOVE\n");
3343 return PYX_TRANSPORT_LU_COMM_FAILURE;
3344 }
3345 /*
3346 * The provided reservation key much match the existing reservation key
3347 * provided during this initiator's I_T nexus registration.
3348 */
3349 if (res_key != pr_reg->pr_res_key) {
3350 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3351 " res_key: 0x%016Lx does not match existing SA REGISTER"
3352 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3353 core_scsi3_put_pr_reg(pr_reg);
3354 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3355 }
3356 /*
3357 * The service active reservation key needs to be non zero
3358 */
3359 if (!sa_res_key) {
3360 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3361 " sa_res_key\n");
3362 core_scsi3_put_pr_reg(pr_reg);
3363 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3364 }
3365
3366 /*
3367 * Determine the Relative Target Port Identifier where the reservation
3368 * will be moved to for the TransportID containing SCSI initiator WWN
3369 * information.
3370 */
3371 buf = transport_kmap_first_data_page(cmd);
3372 rtpi = (buf[18] & 0xff) << 8;
3373 rtpi |= buf[19] & 0xff;
3374 tid_len = (buf[20] & 0xff) << 24;
3375 tid_len |= (buf[21] & 0xff) << 16;
3376 tid_len |= (buf[22] & 0xff) << 8;
3377 tid_len |= buf[23] & 0xff;
3378 transport_kunmap_first_data_page(cmd);
3379 buf = NULL;
3380
3381 if ((tid_len + 24) != cmd->data_length) {
3382 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3383 " does not equal CDB data_length: %u\n", tid_len,
3384 cmd->data_length);
3385 core_scsi3_put_pr_reg(pr_reg);
3386 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3387 }
3388
3389 spin_lock(&dev->se_port_lock);
3390 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3391 if (se_port->sep_rtpi != rtpi)
3392 continue;
3393 dest_se_tpg = se_port->sep_tpg;
3394 if (!dest_se_tpg)
3395 continue;
3396 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3397 if (!dest_tf_ops)
3398 continue;
3399
3400 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3401 smp_mb__after_atomic_inc();
3402 spin_unlock(&dev->se_port_lock);
3403
3404 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3405 if (ret != 0) {
3406 pr_err("core_scsi3_tpg_depend_item() failed"
3407 " for dest_se_tpg\n");
3408 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3409 smp_mb__after_atomic_dec();
3410 core_scsi3_put_pr_reg(pr_reg);
3411 return PYX_TRANSPORT_LU_COMM_FAILURE;
3412 }
3413
3414 spin_lock(&dev->se_port_lock);
3415 break;
3416 }
3417 spin_unlock(&dev->se_port_lock);
3418
3419 if (!dest_se_tpg || !dest_tf_ops) {
3420 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3421 " fabric ops from Relative Target Port Identifier:"
3422 " %hu\n", rtpi);
3423 core_scsi3_put_pr_reg(pr_reg);
3424 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3425 }
3426
3427 buf = transport_kmap_first_data_page(cmd);
3428 proto_ident = (buf[24] & 0x0f);
3429 #if 0
3430 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3431 " 0x%02x\n", proto_ident);
3432 #endif
3433 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3434 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3435 " proto_ident: 0x%02x does not match ident: 0x%02x"
3436 " from fabric: %s\n", proto_ident,
3437 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3438 dest_tf_ops->get_fabric_name());
3439 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3440 goto out;
3441 }
3442 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3443 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3444 " containg a valid tpg_parse_pr_out_transport_id"
3445 " function pointer\n");
3446 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3447 goto out;
3448 }
3449 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3450 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3451 if (!initiator_str) {
3452 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3453 " initiator_str from Transport ID\n");
3454 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3455 goto out;
3456 }
3457
3458 transport_kunmap_first_data_page(cmd);
3459 buf = NULL;
3460
3461 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3462 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3463 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3464 iport_ptr : "");
3465 /*
3466 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3467 * action specifies a TransportID that is the same as the initiator port
3468 * of the I_T nexus for the command received, then the command shall
3469 * be terminated with CHECK CONDITION status, with the sense key set to
3470 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3471 * IN PARAMETER LIST.
3472 */
3473 pr_reg_nacl = pr_reg->pr_reg_nacl;
3474 matching_iname = (!strcmp(initiator_str,
3475 pr_reg_nacl->initiatorname)) ? 1 : 0;
3476 if (!matching_iname)
3477 goto after_iport_check;
3478
3479 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3480 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3481 " matches: %s on received I_T Nexus\n", initiator_str,
3482 pr_reg_nacl->initiatorname);
3483 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3484 goto out;
3485 }
3486 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3487 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3488 " matches: %s %s on received I_T Nexus\n",
3489 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3490 pr_reg->pr_reg_isid);
3491 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3492 goto out;
3493 }
3494 after_iport_check:
3495 /*
3496 * Locate the destination struct se_node_acl from the received Transport ID
3497 */
3498 spin_lock_irq(&dest_se_tpg->acl_node_lock);
3499 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3500 initiator_str);
3501 if (dest_node_acl) {
3502 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3503 smp_mb__after_atomic_inc();
3504 }
3505 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3506
3507 if (!dest_node_acl) {
3508 pr_err("Unable to locate %s dest_node_acl for"
3509 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3510 initiator_str);
3511 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3512 goto out;
3513 }
3514 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3515 if (ret != 0) {
3516 pr_err("core_scsi3_nodeacl_depend_item() for"
3517 " dest_node_acl\n");
3518 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3519 smp_mb__after_atomic_dec();
3520 dest_node_acl = NULL;
3521 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3522 goto out;
3523 }
3524 #if 0
3525 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3526 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3527 dest_node_acl->initiatorname);
3528 #endif
3529 /*
3530 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3531 * PORT IDENTIFIER.
3532 */
3533 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3534 if (!dest_se_deve) {
3535 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3536 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3537 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3538 goto out;
3539 }
3540
3541 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3542 if (ret < 0) {
3543 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3544 atomic_dec(&dest_se_deve->pr_ref_count);
3545 smp_mb__after_atomic_dec();
3546 dest_se_deve = NULL;
3547 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3548 goto out;
3549 }
3550 #if 0
3551 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3552 " ACL for dest_se_deve->mapped_lun: %u\n",
3553 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3554 dest_se_deve->mapped_lun);
3555 #endif
3556 /*
3557 * A persistent reservation needs to already existing in order to
3558 * successfully complete the REGISTER_AND_MOVE service action..
3559 */
3560 spin_lock(&dev->dev_reservation_lock);
3561 pr_res_holder = dev->dev_pr_res_holder;
3562 if (!pr_res_holder) {
3563 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3564 " currently held\n");
3565 spin_unlock(&dev->dev_reservation_lock);
3566 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3567 goto out;
3568 }
3569 /*
3570 * The received on I_T Nexus must be the reservation holder.
3571 *
3572 * From spc4r17 section 5.7.8 Table 50 --
3573 * Register behaviors for a REGISTER AND MOVE service action
3574 */
3575 if (pr_res_holder != pr_reg) {
3576 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3577 " Nexus is not reservation holder\n");
3578 spin_unlock(&dev->dev_reservation_lock);
3579 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3580 goto out;
3581 }
3582 /*
3583 * From spc4r17 section 5.7.8: registering and moving reservation
3584 *
3585 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3586 * action is received and the established persistent reservation is a
3587 * Write Exclusive - All Registrants type or Exclusive Access -
3588 * All Registrants type reservation, then the command shall be completed
3589 * with RESERVATION CONFLICT status.
3590 */
3591 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3592 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3593 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3594 " reservation for type: %s\n",
3595 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3596 spin_unlock(&dev->dev_reservation_lock);
3597 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3598 goto out;
3599 }
3600 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3601 /*
3602 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3603 */
3604 type = pr_res_holder->pr_res_type;
3605 scope = pr_res_holder->pr_res_type;
3606 /*
3607 * c) Associate the reservation key specified in the SERVICE ACTION
3608 * RESERVATION KEY field with the I_T nexus specified as the
3609 * destination of the register and move, where:
3610 * A) The I_T nexus is specified by the TransportID and the
3611 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3612 * B) Regardless of the TransportID format used, the association for
3613 * the initiator port is based on either the initiator port name
3614 * (see 3.1.71) on SCSI transport protocols where port names are
3615 * required or the initiator port identifier (see 3.1.70) on SCSI
3616 * transport protocols where port names are not required;
3617 * d) Register the reservation key specified in the SERVICE ACTION
3618 * RESERVATION KEY field;
3619 * e) Retain the reservation key specified in the SERVICE ACTION
3620 * RESERVATION KEY field and associated information;
3621 *
3622 * Also, It is not an error for a REGISTER AND MOVE service action to
3623 * register an I_T nexus that is already registered with the same
3624 * reservation key or a different reservation key.
3625 */
3626 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3627 iport_ptr);
3628 if (!dest_pr_reg) {
3629 ret = core_scsi3_alloc_registration(cmd->se_dev,
3630 dest_node_acl, dest_se_deve, iport_ptr,
3631 sa_res_key, 0, aptpl, 2, 1);
3632 if (ret != 0) {
3633 spin_unlock(&dev->dev_reservation_lock);
3634 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3635 goto out;
3636 }
3637 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3638 iport_ptr);
3639 new_reg = 1;
3640 }
3641 /*
3642 * f) Release the persistent reservation for the persistent reservation
3643 * holder (i.e., the I_T nexus on which the
3644 */
3645 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3646 dev->dev_pr_res_holder, 0);
3647 /*
3648 * g) Move the persistent reservation to the specified I_T nexus using
3649 * the same scope and type as the persistent reservation released in
3650 * item f); and
3651 */
3652 dev->dev_pr_res_holder = dest_pr_reg;
3653 dest_pr_reg->pr_res_holder = 1;
3654 dest_pr_reg->pr_res_type = type;
3655 pr_reg->pr_res_scope = scope;
3656 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3657 PR_REG_ISID_ID_LEN);
3658 /*
3659 * Increment PRGeneration for existing registrations..
3660 */
3661 if (!new_reg)
3662 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3663 spin_unlock(&dev->dev_reservation_lock);
3664
3665 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3666 " created new reservation holder TYPE: %s on object RTPI:"
3667 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3668 core_scsi3_pr_dump_type(type), rtpi,
3669 dest_pr_reg->pr_res_generation);
3670 pr_debug("SPC-3 PR Successfully moved reservation from"
3671 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3672 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3673 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3674 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3675 iport_ptr : "");
3676 /*
3677 * It is now safe to release configfs group dependencies for destination
3678 * of Transport ID Initiator Device/Port Identifier
3679 */
3680 core_scsi3_lunacl_undepend_item(dest_se_deve);
3681 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3682 core_scsi3_tpg_undepend_item(dest_se_tpg);
3683 /*
3684 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3685 * nexus on which PERSISTENT RESERVE OUT command was received.
3686 */
3687 if (unreg) {
3688 spin_lock(&pr_tmpl->registration_lock);
3689 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3690 spin_unlock(&pr_tmpl->registration_lock);
3691 } else
3692 core_scsi3_put_pr_reg(pr_reg);
3693
3694 /*
3695 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3696 * write out the updated metadata to struct file for this SCSI device.
3697 */
3698 if (!aptpl) {
3699 pr_tmpl->pr_aptpl_active = 0;
3700 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3701 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3702 " REGISTER_AND_MOVE\n");
3703 } else {
3704 pr_tmpl->pr_aptpl_active = 1;
3705 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3706 &dest_pr_reg->pr_aptpl_buf[0],
3707 pr_tmpl->pr_aptpl_buf_len);
3708 if (!ret)
3709 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3710 " REGISTER_AND_MOVE\n");
3711 }
3712
3713 transport_kunmap_first_data_page(cmd);
3714
3715 core_scsi3_put_pr_reg(dest_pr_reg);
3716 return 0;
3717 out:
3718 if (buf)
3719 transport_kunmap_first_data_page(cmd);
3720 if (dest_se_deve)
3721 core_scsi3_lunacl_undepend_item(dest_se_deve);
3722 if (dest_node_acl)
3723 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3724 core_scsi3_tpg_undepend_item(dest_se_tpg);
3725 core_scsi3_put_pr_reg(pr_reg);
3726 return ret;
3727 }
3728
3729 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3730 {
3731 unsigned int __v1, __v2;
3732
3733 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3734 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3735
3736 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3737 }
3738
3739 /*
3740 * See spc4r17 section 6.14 Table 170
3741 */
3742 static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
3743 {
3744 unsigned char *buf;
3745 u64 res_key, sa_res_key;
3746 int sa, scope, type, aptpl;
3747 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3748 /*
3749 * FIXME: A NULL struct se_session pointer means an this is not coming from
3750 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3751 */
3752 if (!cmd->se_sess)
3753 return PYX_TRANSPORT_LU_COMM_FAILURE;
3754
3755 if (cmd->data_length < 24) {
3756 pr_warn("SPC-PR: Received PR OUT parameter list"
3757 " length too small: %u\n", cmd->data_length);
3758 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3759 }
3760 /*
3761 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3762 */
3763 sa = (cdb[1] & 0x1f);
3764 scope = (cdb[2] & 0xf0);
3765 type = (cdb[2] & 0x0f);
3766
3767 buf = transport_kmap_first_data_page(cmd);
3768 /*
3769 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3770 */
3771 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3772 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3773 /*
3774 * REGISTER_AND_MOVE uses a different SA parameter list containing
3775 * SCSI TransportIDs.
3776 */
3777 if (sa != PRO_REGISTER_AND_MOVE) {
3778 spec_i_pt = (buf[20] & 0x08);
3779 all_tg_pt = (buf[20] & 0x04);
3780 aptpl = (buf[20] & 0x01);
3781 } else {
3782 aptpl = (buf[17] & 0x01);
3783 unreg = (buf[17] & 0x02);
3784 }
3785 transport_kunmap_first_data_page(cmd);
3786 buf = NULL;
3787
3788 /*
3789 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3790 */
3791 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3792 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3793 /*
3794 * From spc4r17 section 6.14:
3795 *
3796 * If the SPEC_I_PT bit is set to zero, the service action is not
3797 * REGISTER AND MOVE, and the parameter list length is not 24, then
3798 * the command shall be terminated with CHECK CONDITION status, with
3799 * the sense key set to ILLEGAL REQUEST, and the additional sense
3800 * code set to PARAMETER LIST LENGTH ERROR.
3801 */
3802 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3803 (cmd->data_length != 24)) {
3804 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3805 " list length: %u\n", cmd->data_length);
3806 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3807 }
3808 /*
3809 * (core_scsi3_emulate_pro_* function parameters
3810 * are defined by spc4r17 Table 174:
3811 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3812 */
3813 switch (sa) {
3814 case PRO_REGISTER:
3815 return core_scsi3_emulate_pro_register(cmd,
3816 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3817 case PRO_RESERVE:
3818 return core_scsi3_emulate_pro_reserve(cmd,
3819 type, scope, res_key);
3820 case PRO_RELEASE:
3821 return core_scsi3_emulate_pro_release(cmd,
3822 type, scope, res_key);
3823 case PRO_CLEAR:
3824 return core_scsi3_emulate_pro_clear(cmd, res_key);
3825 case PRO_PREEMPT:
3826 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3827 res_key, sa_res_key, 0);
3828 case PRO_PREEMPT_AND_ABORT:
3829 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3830 res_key, sa_res_key, 1);
3831 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3832 return core_scsi3_emulate_pro_register(cmd,
3833 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3834 case PRO_REGISTER_AND_MOVE:
3835 return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3836 sa_res_key, aptpl, unreg);
3837 default:
3838 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3839 " action: 0x%02x\n", cdb[1] & 0x1f);
3840 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3841 }
3842
3843 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3844 }
3845
3846 /*
3847 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3848 *
3849 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3850 */
3851 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3852 {
3853 struct se_device *se_dev = cmd->se_dev;
3854 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3855 struct t10_pr_registration *pr_reg;
3856 unsigned char *buf;
3857 u32 add_len = 0, off = 8;
3858
3859 if (cmd->data_length < 8) {
3860 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3861 " too small\n", cmd->data_length);
3862 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3863 }
3864
3865 buf = transport_kmap_first_data_page(cmd);
3866 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3867 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3868 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3869 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3870
3871 spin_lock(&su_dev->t10_pr.registration_lock);
3872 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3873 pr_reg_list) {
3874 /*
3875 * Check for overflow of 8byte PRI READ_KEYS payload and
3876 * next reservation key list descriptor.
3877 */
3878 if ((add_len + 8) > (cmd->data_length - 8))
3879 break;
3880
3881 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3882 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3883 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3884 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3885 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3886 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3887 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3888 buf[off++] = (pr_reg->pr_res_key & 0xff);
3889
3890 add_len += 8;
3891 }
3892 spin_unlock(&su_dev->t10_pr.registration_lock);
3893
3894 buf[4] = ((add_len >> 24) & 0xff);
3895 buf[5] = ((add_len >> 16) & 0xff);
3896 buf[6] = ((add_len >> 8) & 0xff);
3897 buf[7] = (add_len & 0xff);
3898
3899 transport_kunmap_first_data_page(cmd);
3900
3901 return 0;
3902 }
3903
3904 /*
3905 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3906 *
3907 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3908 */
3909 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3910 {
3911 struct se_device *se_dev = cmd->se_dev;
3912 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3913 struct t10_pr_registration *pr_reg;
3914 unsigned char *buf;
3915 u64 pr_res_key;
3916 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3917
3918 if (cmd->data_length < 8) {
3919 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3920 " too small\n", cmd->data_length);
3921 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3922 }
3923
3924 buf = transport_kmap_first_data_page(cmd);
3925 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3926 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3927 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3928 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3929
3930 spin_lock(&se_dev->dev_reservation_lock);
3931 pr_reg = se_dev->dev_pr_res_holder;
3932 if ((pr_reg)) {
3933 /*
3934 * Set the hardcoded Additional Length
3935 */
3936 buf[4] = ((add_len >> 24) & 0xff);
3937 buf[5] = ((add_len >> 16) & 0xff);
3938 buf[6] = ((add_len >> 8) & 0xff);
3939 buf[7] = (add_len & 0xff);
3940
3941 if (cmd->data_length < 22)
3942 goto err;
3943
3944 /*
3945 * Set the Reservation key.
3946 *
3947 * From spc4r17, section 5.7.10:
3948 * A persistent reservation holder has its reservation key
3949 * returned in the parameter data from a PERSISTENT
3950 * RESERVE IN command with READ RESERVATION service action as
3951 * follows:
3952 * a) For a persistent reservation of the type Write Exclusive
3953 * - All Registrants or Exclusive Access ­ All Regitrants,
3954 * the reservation key shall be set to zero; or
3955 * b) For all other persistent reservation types, the
3956 * reservation key shall be set to the registered
3957 * reservation key for the I_T nexus that holds the
3958 * persistent reservation.
3959 */
3960 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3961 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3962 pr_res_key = 0;
3963 else
3964 pr_res_key = pr_reg->pr_res_key;
3965
3966 buf[8] = ((pr_res_key >> 56) & 0xff);
3967 buf[9] = ((pr_res_key >> 48) & 0xff);
3968 buf[10] = ((pr_res_key >> 40) & 0xff);
3969 buf[11] = ((pr_res_key >> 32) & 0xff);
3970 buf[12] = ((pr_res_key >> 24) & 0xff);
3971 buf[13] = ((pr_res_key >> 16) & 0xff);
3972 buf[14] = ((pr_res_key >> 8) & 0xff);
3973 buf[15] = (pr_res_key & 0xff);
3974 /*
3975 * Set the SCOPE and TYPE
3976 */
3977 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3978 (pr_reg->pr_res_type & 0x0f);
3979 }
3980
3981 err:
3982 spin_unlock(&se_dev->dev_reservation_lock);
3983 transport_kunmap_first_data_page(cmd);
3984
3985 return 0;
3986 }
3987
3988 /*
3989 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3990 *
3991 * See spc4r17 section 6.13.4 Table 165
3992 */
3993 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3994 {
3995 struct se_device *dev = cmd->se_dev;
3996 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3997 unsigned char *buf;
3998 u16 add_len = 8; /* Hardcoded to 8. */
3999
4000 if (cmd->data_length < 6) {
4001 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4002 " %u too small\n", cmd->data_length);
4003 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4004 }
4005
4006 buf = transport_kmap_first_data_page(cmd);
4007
4008 buf[0] = ((add_len << 8) & 0xff);
4009 buf[1] = (add_len & 0xff);
4010 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4011 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4012 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4013 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4014 /*
4015 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4016 * set the TMV: Task Mask Valid bit.
4017 */
4018 buf[3] |= 0x80;
4019 /*
4020 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4021 */
4022 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4023 /*
4024 * PTPL_A: Persistence across Target Power Loss Active bit
4025 */
4026 if (pr_tmpl->pr_aptpl_active)
4027 buf[3] |= 0x01;
4028 /*
4029 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4030 */
4031 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4032 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4033 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4034 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4035 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4036 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4037
4038 transport_kunmap_first_data_page(cmd);
4039
4040 return 0;
4041 }
4042
4043 /*
4044 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4045 *
4046 * See spc4r17 section 6.13.5 Table 168 and 169
4047 */
4048 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4049 {
4050 struct se_device *se_dev = cmd->se_dev;
4051 struct se_node_acl *se_nacl;
4052 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4053 struct se_portal_group *se_tpg;
4054 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4055 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4056 unsigned char *buf;
4057 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4058 u32 off = 8; /* off into first Full Status descriptor */
4059 int format_code = 0;
4060
4061 if (cmd->data_length < 8) {
4062 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4063 " too small\n", cmd->data_length);
4064 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4065 }
4066
4067 buf = transport_kmap_first_data_page(cmd);
4068
4069 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4070 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4071 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4072 buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4073
4074 spin_lock(&pr_tmpl->registration_lock);
4075 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4076 &pr_tmpl->registration_list, pr_reg_list) {
4077
4078 se_nacl = pr_reg->pr_reg_nacl;
4079 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4080 add_desc_len = 0;
4081
4082 atomic_inc(&pr_reg->pr_res_holders);
4083 smp_mb__after_atomic_inc();
4084 spin_unlock(&pr_tmpl->registration_lock);
4085 /*
4086 * Determine expected length of $FABRIC_MOD specific
4087 * TransportID full status descriptor..
4088 */
4089 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4090 se_tpg, se_nacl, pr_reg, &format_code);
4091
4092 if ((exp_desc_len + add_len) > cmd->data_length) {
4093 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4094 " out of buffer: %d\n", cmd->data_length);
4095 spin_lock(&pr_tmpl->registration_lock);
4096 atomic_dec(&pr_reg->pr_res_holders);
4097 smp_mb__after_atomic_dec();
4098 break;
4099 }
4100 /*
4101 * Set RESERVATION KEY
4102 */
4103 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4104 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4105 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4106 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4107 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4108 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4109 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4110 buf[off++] = (pr_reg->pr_res_key & 0xff);
4111 off += 4; /* Skip Over Reserved area */
4112
4113 /*
4114 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4115 */
4116 if (pr_reg->pr_reg_all_tg_pt)
4117 buf[off] = 0x02;
4118 /*
4119 * The struct se_lun pointer will be present for the
4120 * reservation holder for PR_HOLDER bit.
4121 *
4122 * Also, if this registration is the reservation
4123 * holder, fill in SCOPE and TYPE in the next byte.
4124 */
4125 if (pr_reg->pr_res_holder) {
4126 buf[off++] |= 0x01;
4127 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4128 (pr_reg->pr_res_type & 0x0f);
4129 } else
4130 off += 2;
4131
4132 off += 4; /* Skip over reserved area */
4133 /*
4134 * From spc4r17 6.3.15:
4135 *
4136 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4137 * IDENTIFIER field contains the relative port identifier (see
4138 * 3.1.120) of the target port that is part of the I_T nexus
4139 * described by this full status descriptor. If the ALL_TG_PT
4140 * bit is set to one, the contents of the RELATIVE TARGET PORT
4141 * IDENTIFIER field are not defined by this standard.
4142 */
4143 if (!pr_reg->pr_reg_all_tg_pt) {
4144 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4145
4146 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4147 buf[off++] = (port->sep_rtpi & 0xff);
4148 } else
4149 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4150
4151 /*
4152 * Now, have the $FABRIC_MOD fill in the protocol identifier
4153 */
4154 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4155 se_nacl, pr_reg, &format_code, &buf[off+4]);
4156
4157 spin_lock(&pr_tmpl->registration_lock);
4158 atomic_dec(&pr_reg->pr_res_holders);
4159 smp_mb__after_atomic_dec();
4160 /*
4161 * Set the ADDITIONAL DESCRIPTOR LENGTH
4162 */
4163 buf[off++] = ((desc_len >> 24) & 0xff);
4164 buf[off++] = ((desc_len >> 16) & 0xff);
4165 buf[off++] = ((desc_len >> 8) & 0xff);
4166 buf[off++] = (desc_len & 0xff);
4167 /*
4168 * Size of full desctipor header minus TransportID
4169 * containing $FABRIC_MOD specific) initiator device/port
4170 * WWN information.
4171 *
4172 * See spc4r17 Section 6.13.5 Table 169
4173 */
4174 add_desc_len = (24 + desc_len);
4175
4176 off += desc_len;
4177 add_len += add_desc_len;
4178 }
4179 spin_unlock(&pr_tmpl->registration_lock);
4180 /*
4181 * Set ADDITIONAL_LENGTH
4182 */
4183 buf[4] = ((add_len >> 24) & 0xff);
4184 buf[5] = ((add_len >> 16) & 0xff);
4185 buf[6] = ((add_len >> 8) & 0xff);
4186 buf[7] = (add_len & 0xff);
4187
4188 transport_kunmap_first_data_page(cmd);
4189
4190 return 0;
4191 }
4192
4193 static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
4194 {
4195 switch (cdb[1] & 0x1f) {
4196 case PRI_READ_KEYS:
4197 return core_scsi3_pri_read_keys(cmd);
4198 case PRI_READ_RESERVATION:
4199 return core_scsi3_pri_read_reservation(cmd);
4200 case PRI_REPORT_CAPABILITIES:
4201 return core_scsi3_pri_report_capabilities(cmd);
4202 case PRI_READ_FULL_STATUS:
4203 return core_scsi3_pri_read_full_status(cmd);
4204 default:
4205 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4206 " action: 0x%02x\n", cdb[1] & 0x1f);
4207 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4208 }
4209
4210 }
4211
4212 int core_scsi3_emulate_pr(struct se_cmd *cmd)
4213 {
4214 unsigned char *cdb = &cmd->t_task_cdb[0];
4215 struct se_device *dev = cmd->se_dev;
4216 /*
4217 * Following spc2r20 5.5.1 Reservations overview:
4218 *
4219 * If a logical unit has been reserved by any RESERVE command and is
4220 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4221 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4222 * initiator or service action and shall terminate with a RESERVATION
4223 * CONFLICT status.
4224 */
4225 if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
4226 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4227 " SPC-2 reservation is held, returning"
4228 " RESERVATION_CONFLICT\n");
4229 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4230 }
4231
4232 return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
4233 core_scsi3_emulate_pr_out(cmd, cdb) :
4234 core_scsi3_emulate_pr_in(cmd, cdb);
4235 }
4236
4237 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4238 {
4239 return 0;
4240 }
4241
4242 static int core_pt_seq_non_holder(
4243 struct se_cmd *cmd,
4244 unsigned char *cdb,
4245 u32 pr_reg_type)
4246 {
4247 return 0;
4248 }
4249
4250 int core_setup_reservations(struct se_device *dev, int force_pt)
4251 {
4252 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4253 struct t10_reservation *rest = &su_dev->t10_pr;
4254 /*
4255 * If this device is from Target_Core_Mod/pSCSI, use the reservations
4256 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
4257 * cause a problem because libata and some SATA RAID HBAs appear
4258 * under Linux/SCSI, but to emulate reservations themselves.
4259 */
4260 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4261 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4262 rest->res_type = SPC_PASSTHROUGH;
4263 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4264 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4265 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4266 " emulation\n", dev->transport->name);
4267 return 0;
4268 }
4269 /*
4270 * If SPC-3 or above is reported by real or emulated struct se_device,
4271 * use emulated Persistent Reservations.
4272 */
4273 if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4274 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4275 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4276 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4277 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4278 " emulation\n", dev->transport->name);
4279 } else {
4280 rest->res_type = SPC2_RESERVATIONS;
4281 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4282 rest->pr_ops.t10_seq_non_holder =
4283 &core_scsi2_reservation_seq_non_holder;
4284 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4285 dev->transport->name);
4286 }
4287
4288 return 0;
4289 }
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