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Merge branch 'drm-nouveau-fixes-3.9' of git://anongit.freedesktop.org/git/nouveau...
[linux-2.6/libata-dev.git] / drivers / target / target_core_pr.c
blob3240f2cc81efe0b65d2369c5cdadd9d3d22d3df4
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 * (c) Copyright 2009-2012 RisingTide Systems LLC.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <linux/list.h>
30 #include <linux/file.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_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_configfs.h>
39
40 #include "target_core_internal.h"
41 #include "target_core_pr.h"
42 #include "target_core_ua.h"
43
44 /*
45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
46 */
47 struct pr_transport_id_holder {
48 int dest_local_nexus;
49 struct t10_pr_registration *dest_pr_reg;
50 struct se_portal_group *dest_tpg;
51 struct se_node_acl *dest_node_acl;
52 struct se_dev_entry *dest_se_deve;
53 struct list_head dest_list;
54 };
55
56 int core_pr_dump_initiator_port(
57 struct t10_pr_registration *pr_reg,
58 char *buf,
59 u32 size)
60 {
61 if (!pr_reg->isid_present_at_reg)
62 return 0;
63
64 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
65 return 1;
66 }
67
68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
69 struct t10_pr_registration *, int);
70
71 static sense_reason_t
72 target_scsi2_reservation_check(struct se_cmd *cmd)
73 {
74 struct se_device *dev = cmd->se_dev;
75 struct se_session *sess = cmd->se_sess;
76
77 switch (cmd->t_task_cdb[0]) {
78 case INQUIRY:
79 case RELEASE:
80 case RELEASE_10:
81 return 0;
82 default:
83 break;
84 }
85
86 if (!dev->dev_reserved_node_acl || !sess)
87 return 0;
88
89 if (dev->dev_reserved_node_acl != sess->se_node_acl)
90 return TCM_RESERVATION_CONFLICT;
91
92 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
93 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
94 return TCM_RESERVATION_CONFLICT;
95 }
96
97 return 0;
98 }
99
100 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
101 struct se_node_acl *, struct se_session *);
102 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
103
104 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
105 {
106 struct se_session *se_sess = cmd->se_sess;
107 struct se_device *dev = cmd->se_dev;
108 struct t10_pr_registration *pr_reg;
109 struct t10_reservation *pr_tmpl = &dev->t10_pr;
110 int conflict = 0;
111
112 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
113 se_sess);
114 if (pr_reg) {
115 /*
116 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
117 * behavior
118 *
119 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
120 * status, but no reservation shall be established and the
121 * persistent reservation shall not be changed, if the command
122 * is received from a) and b) below.
123 *
124 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
125 * status, but the persistent reservation shall not be released,
126 * if the command is received from a) and b)
127 *
128 * a) An I_T nexus that is a persistent reservation holder; or
129 * b) An I_T nexus that is registered if a registrants only or
130 * all registrants type persistent reservation is present.
131 *
132 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
133 * RELEASE(6) command, or RELEASE(10) command shall be processed
134 * as defined in SPC-2.
135 */
136 if (pr_reg->pr_res_holder) {
137 core_scsi3_put_pr_reg(pr_reg);
138 return 1;
139 }
140 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
141 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
142 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
143 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
144 core_scsi3_put_pr_reg(pr_reg);
145 return 1;
146 }
147 core_scsi3_put_pr_reg(pr_reg);
148 conflict = 1;
149 } else {
150 /*
151 * Following spc2r20 5.5.1 Reservations overview:
152 *
153 * If a logical unit has executed a PERSISTENT RESERVE OUT
154 * command with the REGISTER or the REGISTER AND IGNORE
155 * EXISTING KEY service action and is still registered by any
156 * initiator, all RESERVE commands and all RELEASE commands
157 * regardless of initiator shall conflict and shall terminate
158 * with a RESERVATION CONFLICT status.
159 */
160 spin_lock(&pr_tmpl->registration_lock);
161 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
162 spin_unlock(&pr_tmpl->registration_lock);
163 }
164
165 if (conflict) {
166 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
167 " while active SPC-3 registrations exist,"
168 " returning RESERVATION_CONFLICT\n");
169 return -EBUSY;
170 }
171
172 return 0;
173 }
174
175 sense_reason_t
176 target_scsi2_reservation_release(struct se_cmd *cmd)
177 {
178 struct se_device *dev = cmd->se_dev;
179 struct se_session *sess = cmd->se_sess;
180 struct se_portal_group *tpg;
181 int rc;
182
183 if (!sess || !sess->se_tpg)
184 goto out;
185 rc = target_check_scsi2_reservation_conflict(cmd);
186 if (rc == 1)
187 goto out;
188 if (rc < 0)
189 return TCM_RESERVATION_CONFLICT;
190
191 spin_lock(&dev->dev_reservation_lock);
192 if (!dev->dev_reserved_node_acl || !sess)
193 goto out_unlock;
194
195 if (dev->dev_reserved_node_acl != sess->se_node_acl)
196 goto out_unlock;
197
198 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
199 goto out_unlock;
200
201 dev->dev_reserved_node_acl = NULL;
202 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
203 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
204 dev->dev_res_bin_isid = 0;
205 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
206 }
207 tpg = sess->se_tpg;
208 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
209 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
210 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
211 sess->se_node_acl->initiatorname);
212
213 out_unlock:
214 spin_unlock(&dev->dev_reservation_lock);
215 out:
216 target_complete_cmd(cmd, GOOD);
217 return 0;
218 }
219
220 sense_reason_t
221 target_scsi2_reservation_reserve(struct se_cmd *cmd)
222 {
223 struct se_device *dev = cmd->se_dev;
224 struct se_session *sess = cmd->se_sess;
225 struct se_portal_group *tpg;
226 sense_reason_t ret = 0;
227 int rc;
228
229 if ((cmd->t_task_cdb[1] & 0x01) &&
230 (cmd->t_task_cdb[1] & 0x02)) {
231 pr_err("LongIO and Obselete Bits set, returning"
232 " ILLEGAL_REQUEST\n");
233 return TCM_UNSUPPORTED_SCSI_OPCODE;
234 }
235 /*
236 * This is currently the case for target_core_mod passthrough struct se_cmd
237 * ops
238 */
239 if (!sess || !sess->se_tpg)
240 goto out;
241 rc = target_check_scsi2_reservation_conflict(cmd);
242 if (rc == 1)
243 goto out;
244
245 if (rc < 0)
246 return TCM_RESERVATION_CONFLICT;
247
248 tpg = sess->se_tpg;
249 spin_lock(&dev->dev_reservation_lock);
250 if (dev->dev_reserved_node_acl &&
251 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
252 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
253 tpg->se_tpg_tfo->get_fabric_name());
254 pr_err("Original reserver LUN: %u %s\n",
255 cmd->se_lun->unpacked_lun,
256 dev->dev_reserved_node_acl->initiatorname);
257 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
258 " from %s \n", cmd->se_lun->unpacked_lun,
259 cmd->se_deve->mapped_lun,
260 sess->se_node_acl->initiatorname);
261 ret = TCM_RESERVATION_CONFLICT;
262 goto out_unlock;
263 }
264
265 dev->dev_reserved_node_acl = sess->se_node_acl;
266 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
267 if (sess->sess_bin_isid != 0) {
268 dev->dev_res_bin_isid = sess->sess_bin_isid;
269 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
270 }
271 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
272 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
273 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
274 sess->se_node_acl->initiatorname);
275
276 out_unlock:
277 spin_unlock(&dev->dev_reservation_lock);
278 out:
279 if (!ret)
280 target_complete_cmd(cmd, GOOD);
281 return ret;
282 }
283
284
285 /*
286 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
287 *
288 * This function is called by those initiator ports who are *NOT*
289 * the active PR reservation holder when a reservation is present.
290 */
291 static int core_scsi3_pr_seq_non_holder(
292 struct se_cmd *cmd,
293 u32 pr_reg_type)
294 {
295 unsigned char *cdb = cmd->t_task_cdb;
296 struct se_dev_entry *se_deve;
297 struct se_session *se_sess = cmd->se_sess;
298 int other_cdb = 0, ignore_reg;
299 int registered_nexus = 0, ret = 1; /* Conflict by default */
300 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
301 int we = 0; /* Write Exclusive */
302 int legacy = 0; /* Act like a legacy device and return
303 * RESERVATION CONFLICT on some CDBs */
304
305 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
306 /*
307 * Determine if the registration should be ignored due to
308 * non-matching ISIDs in target_scsi3_pr_reservation_check().
309 */
310 ignore_reg = (pr_reg_type & 0x80000000);
311 if (ignore_reg)
312 pr_reg_type &= ~0x80000000;
313
314 switch (pr_reg_type) {
315 case PR_TYPE_WRITE_EXCLUSIVE:
316 we = 1;
317 case PR_TYPE_EXCLUSIVE_ACCESS:
318 /*
319 * Some commands are only allowed for the persistent reservation
320 * holder.
321 */
322 if ((se_deve->def_pr_registered) && !(ignore_reg))
323 registered_nexus = 1;
324 break;
325 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
326 we = 1;
327 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
328 /*
329 * Some commands are only allowed for registered I_T Nexuses.
330 */
331 reg_only = 1;
332 if ((se_deve->def_pr_registered) && !(ignore_reg))
333 registered_nexus = 1;
334 break;
335 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
336 we = 1;
337 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
338 /*
339 * Each registered I_T Nexus is a reservation holder.
340 */
341 all_reg = 1;
342 if ((se_deve->def_pr_registered) && !(ignore_reg))
343 registered_nexus = 1;
344 break;
345 default:
346 return -EINVAL;
347 }
348 /*
349 * Referenced from spc4r17 table 45 for *NON* PR holder access
350 */
351 switch (cdb[0]) {
352 case SECURITY_PROTOCOL_IN:
353 if (registered_nexus)
354 return 0;
355 ret = (we) ? 0 : 1;
356 break;
357 case MODE_SENSE:
358 case MODE_SENSE_10:
359 case READ_ATTRIBUTE:
360 case READ_BUFFER:
361 case RECEIVE_DIAGNOSTIC:
362 if (legacy) {
363 ret = 1;
364 break;
365 }
366 if (registered_nexus) {
367 ret = 0;
368 break;
369 }
370 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
371 break;
372 case PERSISTENT_RESERVE_OUT:
373 /*
374 * This follows PERSISTENT_RESERVE_OUT service actions that
375 * are allowed in the presence of various reservations.
376 * See spc4r17, table 46
377 */
378 switch (cdb[1] & 0x1f) {
379 case PRO_CLEAR:
380 case PRO_PREEMPT:
381 case PRO_PREEMPT_AND_ABORT:
382 ret = (registered_nexus) ? 0 : 1;
383 break;
384 case PRO_REGISTER:
385 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
386 ret = 0;
387 break;
388 case PRO_REGISTER_AND_MOVE:
389 case PRO_RESERVE:
390 ret = 1;
391 break;
392 case PRO_RELEASE:
393 ret = (registered_nexus) ? 0 : 1;
394 break;
395 default:
396 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
397 " action: 0x%02x\n", cdb[1] & 0x1f);
398 return -EINVAL;
399 }
400 break;
401 case RELEASE:
402 case RELEASE_10:
403 /* Handled by CRH=1 in target_scsi2_reservation_release() */
404 ret = 0;
405 break;
406 case RESERVE:
407 case RESERVE_10:
408 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
409 ret = 0;
410 break;
411 case TEST_UNIT_READY:
412 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
413 break;
414 case MAINTENANCE_IN:
415 switch (cdb[1] & 0x1f) {
416 case MI_MANAGEMENT_PROTOCOL_IN:
417 if (registered_nexus) {
418 ret = 0;
419 break;
420 }
421 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
422 break;
423 case MI_REPORT_SUPPORTED_OPERATION_CODES:
424 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
425 if (legacy) {
426 ret = 1;
427 break;
428 }
429 if (registered_nexus) {
430 ret = 0;
431 break;
432 }
433 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
434 break;
435 case MI_REPORT_ALIASES:
436 case MI_REPORT_IDENTIFYING_INFORMATION:
437 case MI_REPORT_PRIORITY:
438 case MI_REPORT_TARGET_PGS:
439 case MI_REPORT_TIMESTAMP:
440 ret = 0; /* Allowed */
441 break;
442 default:
443 pr_err("Unknown MI Service Action: 0x%02x\n",
444 (cdb[1] & 0x1f));
445 return -EINVAL;
446 }
447 break;
448 case ACCESS_CONTROL_IN:
449 case ACCESS_CONTROL_OUT:
450 case INQUIRY:
451 case LOG_SENSE:
452 case READ_MEDIA_SERIAL_NUMBER:
453 case REPORT_LUNS:
454 case REQUEST_SENSE:
455 case PERSISTENT_RESERVE_IN:
456 ret = 0; /*/ Allowed CDBs */
457 break;
458 default:
459 other_cdb = 1;
460 break;
461 }
462 /*
463 * Case where the CDB is explicitly allowed in the above switch
464 * statement.
465 */
466 if (!ret && !other_cdb) {
467 pr_debug("Allowing explict CDB: 0x%02x for %s"
468 " reservation holder\n", cdb[0],
469 core_scsi3_pr_dump_type(pr_reg_type));
470
471 return ret;
472 }
473 /*
474 * Check if write exclusive initiator ports *NOT* holding the
475 * WRITE_EXCLUSIVE_* reservation.
476 */
477 if (we && !registered_nexus) {
478 if (cmd->data_direction == DMA_TO_DEVICE) {
479 /*
480 * Conflict for write exclusive
481 */
482 pr_debug("%s Conflict for unregistered nexus"
483 " %s CDB: 0x%02x to %s reservation\n",
484 transport_dump_cmd_direction(cmd),
485 se_sess->se_node_acl->initiatorname, cdb[0],
486 core_scsi3_pr_dump_type(pr_reg_type));
487 return 1;
488 } else {
489 /*
490 * Allow non WRITE CDBs for all Write Exclusive
491 * PR TYPEs to pass for registered and
492 * non-registered_nexuxes NOT holding the reservation.
493 *
494 * We only make noise for the unregisterd nexuses,
495 * as we expect registered non-reservation holding
496 * nexuses to issue CDBs.
497 */
498
499 if (!registered_nexus) {
500 pr_debug("Allowing implict CDB: 0x%02x"
501 " for %s reservation on unregistered"
502 " nexus\n", cdb[0],
503 core_scsi3_pr_dump_type(pr_reg_type));
504 }
505
506 return 0;
507 }
508 } else if ((reg_only) || (all_reg)) {
509 if (registered_nexus) {
510 /*
511 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
512 * allow commands from registered nexuses.
513 */
514
515 pr_debug("Allowing implict CDB: 0x%02x for %s"
516 " reservation\n", cdb[0],
517 core_scsi3_pr_dump_type(pr_reg_type));
518
519 return 0;
520 }
521 }
522 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
523 " for %s reservation\n", transport_dump_cmd_direction(cmd),
524 (registered_nexus) ? "" : "un",
525 se_sess->se_node_acl->initiatorname, cdb[0],
526 core_scsi3_pr_dump_type(pr_reg_type));
527
528 return 1; /* Conflict by default */
529 }
530
531 static sense_reason_t
532 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
533 {
534 struct se_device *dev = cmd->se_dev;
535 struct se_session *sess = cmd->se_sess;
536 u32 pr_reg_type;
537
538 if (!dev->dev_pr_res_holder)
539 return 0;
540
541 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
542 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
543 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
544 goto check_nonholder;
545
546 if (dev->dev_pr_res_holder->isid_present_at_reg) {
547 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
548 sess->sess_bin_isid) {
549 pr_reg_type |= 0x80000000;
550 goto check_nonholder;
551 }
552 }
553
554 return 0;
555
556 check_nonholder:
557 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
558 return TCM_RESERVATION_CONFLICT;
559 return 0;
560 }
561
562 static u32 core_scsi3_pr_generation(struct se_device *dev)
563 {
564 u32 prg;
565
566 /*
567 * PRGeneration field shall contain the value of a 32-bit wrapping
568 * counter mainted by the device server.
569 *
570 * Note that this is done regardless of Active Persist across
571 * Target PowerLoss (APTPL)
572 *
573 * See spc4r17 section 6.3.12 READ_KEYS service action
574 */
575 spin_lock(&dev->dev_reservation_lock);
576 prg = dev->t10_pr.pr_generation++;
577 spin_unlock(&dev->dev_reservation_lock);
578
579 return prg;
580 }
581
582 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
583 struct se_device *dev,
584 struct se_node_acl *nacl,
585 struct se_dev_entry *deve,
586 unsigned char *isid,
587 u64 sa_res_key,
588 int all_tg_pt,
589 int aptpl)
590 {
591 struct t10_pr_registration *pr_reg;
592
593 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
594 if (!pr_reg) {
595 pr_err("Unable to allocate struct t10_pr_registration\n");
596 return NULL;
597 }
598
599 pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len,
600 GFP_ATOMIC);
601 if (!pr_reg->pr_aptpl_buf) {
602 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
603 kmem_cache_free(t10_pr_reg_cache, pr_reg);
604 return NULL;
605 }
606
607 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
608 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
609 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
610 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
611 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
612 atomic_set(&pr_reg->pr_res_holders, 0);
613 pr_reg->pr_reg_nacl = nacl;
614 pr_reg->pr_reg_deve = deve;
615 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
616 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
617 pr_reg->pr_res_key = sa_res_key;
618 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
619 pr_reg->pr_reg_aptpl = aptpl;
620 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
621 /*
622 * If an ISID value for this SCSI Initiator Port exists,
623 * save it to the registration now.
624 */
625 if (isid != NULL) {
626 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
627 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
628 pr_reg->isid_present_at_reg = 1;
629 }
630
631 return pr_reg;
632 }
633
634 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
635 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
636
637 /*
638 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
639 * modes.
640 */
641 static struct t10_pr_registration *__core_scsi3_alloc_registration(
642 struct se_device *dev,
643 struct se_node_acl *nacl,
644 struct se_dev_entry *deve,
645 unsigned char *isid,
646 u64 sa_res_key,
647 int all_tg_pt,
648 int aptpl)
649 {
650 struct se_dev_entry *deve_tmp;
651 struct se_node_acl *nacl_tmp;
652 struct se_port *port, *port_tmp;
653 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
654 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
655 int ret;
656 /*
657 * Create a registration for the I_T Nexus upon which the
658 * PROUT REGISTER was received.
659 */
660 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
661 sa_res_key, all_tg_pt, aptpl);
662 if (!pr_reg)
663 return NULL;
664 /*
665 * Return pointer to pr_reg for ALL_TG_PT=0
666 */
667 if (!all_tg_pt)
668 return pr_reg;
669 /*
670 * Create list of matching SCSI Initiator Port registrations
671 * for ALL_TG_PT=1
672 */
673 spin_lock(&dev->se_port_lock);
674 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
675 atomic_inc(&port->sep_tg_pt_ref_cnt);
676 smp_mb__after_atomic_inc();
677 spin_unlock(&dev->se_port_lock);
678
679 spin_lock_bh(&port->sep_alua_lock);
680 list_for_each_entry(deve_tmp, &port->sep_alua_list,
681 alua_port_list) {
682 /*
683 * This pointer will be NULL for demo mode MappedLUNs
684 * that have not been make explict via a ConfigFS
685 * MappedLUN group for the SCSI Initiator Node ACL.
686 */
687 if (!deve_tmp->se_lun_acl)
688 continue;
689
690 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
691 /*
692 * Skip the matching struct se_node_acl that is allocated
693 * above..
694 */
695 if (nacl == nacl_tmp)
696 continue;
697 /*
698 * Only perform PR registrations for target ports on
699 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
700 * arrived.
701 */
702 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
703 continue;
704 /*
705 * Look for a matching Initiator Node ACL in ASCII format
706 */
707 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
708 continue;
709
710 atomic_inc(&deve_tmp->pr_ref_count);
711 smp_mb__after_atomic_inc();
712 spin_unlock_bh(&port->sep_alua_lock);
713 /*
714 * Grab a configfs group dependency that is released
715 * for the exception path at label out: below, or upon
716 * completion of adding ALL_TG_PT=1 registrations in
717 * __core_scsi3_add_registration()
718 */
719 ret = core_scsi3_lunacl_depend_item(deve_tmp);
720 if (ret < 0) {
721 pr_err("core_scsi3_lunacl_depend"
722 "_item() failed\n");
723 atomic_dec(&port->sep_tg_pt_ref_cnt);
724 smp_mb__after_atomic_dec();
725 atomic_dec(&deve_tmp->pr_ref_count);
726 smp_mb__after_atomic_dec();
727 goto out;
728 }
729 /*
730 * Located a matching SCSI Initiator Port on a different
731 * port, allocate the pr_reg_atp and attach it to the
732 * pr_reg->pr_reg_atp_list that will be processed once
733 * the original *pr_reg is processed in
734 * __core_scsi3_add_registration()
735 */
736 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
737 nacl_tmp, deve_tmp, NULL,
738 sa_res_key, all_tg_pt, aptpl);
739 if (!pr_reg_atp) {
740 atomic_dec(&port->sep_tg_pt_ref_cnt);
741 smp_mb__after_atomic_dec();
742 atomic_dec(&deve_tmp->pr_ref_count);
743 smp_mb__after_atomic_dec();
744 core_scsi3_lunacl_undepend_item(deve_tmp);
745 goto out;
746 }
747
748 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
749 &pr_reg->pr_reg_atp_list);
750 spin_lock_bh(&port->sep_alua_lock);
751 }
752 spin_unlock_bh(&port->sep_alua_lock);
753
754 spin_lock(&dev->se_port_lock);
755 atomic_dec(&port->sep_tg_pt_ref_cnt);
756 smp_mb__after_atomic_dec();
757 }
758 spin_unlock(&dev->se_port_lock);
759
760 return pr_reg;
761 out:
762 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
763 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
764 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
765 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
766 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
767 }
768 kmem_cache_free(t10_pr_reg_cache, pr_reg);
769 return NULL;
770 }
771
772 int core_scsi3_alloc_aptpl_registration(
773 struct t10_reservation *pr_tmpl,
774 u64 sa_res_key,
775 unsigned char *i_port,
776 unsigned char *isid,
777 u32 mapped_lun,
778 unsigned char *t_port,
779 u16 tpgt,
780 u32 target_lun,
781 int res_holder,
782 int all_tg_pt,
783 u8 type)
784 {
785 struct t10_pr_registration *pr_reg;
786
787 if (!i_port || !t_port || !sa_res_key) {
788 pr_err("Illegal parameters for APTPL registration\n");
789 return -EINVAL;
790 }
791
792 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
793 if (!pr_reg) {
794 pr_err("Unable to allocate struct t10_pr_registration\n");
795 return -ENOMEM;
796 }
797 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
798
799 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
800 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
801 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
802 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
803 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
804 atomic_set(&pr_reg->pr_res_holders, 0);
805 pr_reg->pr_reg_nacl = NULL;
806 pr_reg->pr_reg_deve = NULL;
807 pr_reg->pr_res_mapped_lun = mapped_lun;
808 pr_reg->pr_aptpl_target_lun = target_lun;
809 pr_reg->pr_res_key = sa_res_key;
810 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
811 pr_reg->pr_reg_aptpl = 1;
812 pr_reg->pr_reg_tg_pt_lun = NULL;
813 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
814 pr_reg->pr_res_type = type;
815 /*
816 * If an ISID value had been saved in APTPL metadata for this
817 * SCSI Initiator Port, restore it now.
818 */
819 if (isid != NULL) {
820 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
821 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
822 pr_reg->isid_present_at_reg = 1;
823 }
824 /*
825 * Copy the i_port and t_port information from caller.
826 */
827 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
828 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
829 pr_reg->pr_reg_tpgt = tpgt;
830 /*
831 * Set pr_res_holder from caller, the pr_reg who is the reservation
832 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
833 * the Initiator Node LUN ACL from the fabric module is created for
834 * this registration.
835 */
836 pr_reg->pr_res_holder = res_holder;
837
838 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
839 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
840 " metadata\n", (res_holder) ? "+reservation" : "");
841 return 0;
842 }
843
844 static void core_scsi3_aptpl_reserve(
845 struct se_device *dev,
846 struct se_portal_group *tpg,
847 struct se_node_acl *node_acl,
848 struct t10_pr_registration *pr_reg)
849 {
850 char i_buf[PR_REG_ISID_ID_LEN];
851 int prf_isid;
852
853 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
854 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
855 PR_REG_ISID_ID_LEN);
856
857 spin_lock(&dev->dev_reservation_lock);
858 dev->dev_pr_res_holder = pr_reg;
859 spin_unlock(&dev->dev_reservation_lock);
860
861 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
862 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
863 tpg->se_tpg_tfo->get_fabric_name(),
864 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
865 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
866 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
867 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
868 (prf_isid) ? &i_buf[0] : "");
869 }
870
871 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
872 struct t10_pr_registration *, int, int);
873
874 static int __core_scsi3_check_aptpl_registration(
875 struct se_device *dev,
876 struct se_portal_group *tpg,
877 struct se_lun *lun,
878 u32 target_lun,
879 struct se_node_acl *nacl,
880 struct se_dev_entry *deve)
881 {
882 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
883 struct t10_reservation *pr_tmpl = &dev->t10_pr;
884 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
885 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
886 u16 tpgt;
887
888 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
889 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
890 /*
891 * Copy Initiator Port information from struct se_node_acl
892 */
893 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
894 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
895 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
896 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
897 /*
898 * Look for the matching registrations+reservation from those
899 * created from APTPL metadata. Note that multiple registrations
900 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
901 * TransportIDs.
902 */
903 spin_lock(&pr_tmpl->aptpl_reg_lock);
904 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
905 pr_reg_aptpl_list) {
906 if (!strcmp(pr_reg->pr_iport, i_port) &&
907 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
908 !(strcmp(pr_reg->pr_tport, t_port)) &&
909 (pr_reg->pr_reg_tpgt == tpgt) &&
910 (pr_reg->pr_aptpl_target_lun == target_lun)) {
911
912 pr_reg->pr_reg_nacl = nacl;
913 pr_reg->pr_reg_deve = deve;
914 pr_reg->pr_reg_tg_pt_lun = lun;
915
916 list_del(&pr_reg->pr_reg_aptpl_list);
917 spin_unlock(&pr_tmpl->aptpl_reg_lock);
918 /*
919 * At this point all of the pointers in *pr_reg will
920 * be setup, so go ahead and add the registration.
921 */
922
923 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
924 /*
925 * If this registration is the reservation holder,
926 * make that happen now..
927 */
928 if (pr_reg->pr_res_holder)
929 core_scsi3_aptpl_reserve(dev, tpg,
930 nacl, pr_reg);
931 /*
932 * Reenable pr_aptpl_active to accept new metadata
933 * updates once the SCSI device is active again..
934 */
935 spin_lock(&pr_tmpl->aptpl_reg_lock);
936 pr_tmpl->pr_aptpl_active = 1;
937 }
938 }
939 spin_unlock(&pr_tmpl->aptpl_reg_lock);
940
941 return 0;
942 }
943
944 int core_scsi3_check_aptpl_registration(
945 struct se_device *dev,
946 struct se_portal_group *tpg,
947 struct se_lun *lun,
948 struct se_lun_acl *lun_acl)
949 {
950 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
951 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
952
953 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
954 return 0;
955
956 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
957 lun->unpacked_lun, nacl, deve);
958 }
959
960 static void __core_scsi3_dump_registration(
961 struct target_core_fabric_ops *tfo,
962 struct se_device *dev,
963 struct se_node_acl *nacl,
964 struct t10_pr_registration *pr_reg,
965 int register_type)
966 {
967 struct se_portal_group *se_tpg = nacl->se_tpg;
968 char i_buf[PR_REG_ISID_ID_LEN];
969 int prf_isid;
970
971 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
972 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
973 PR_REG_ISID_ID_LEN);
974
975 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
976 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
977 "_AND_MOVE" : (register_type == 1) ?
978 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
979 (prf_isid) ? i_buf : "");
980 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
981 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
982 tfo->tpg_get_tag(se_tpg));
983 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
984 " Port(s)\n", tfo->get_fabric_name(),
985 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
986 dev->transport->name);
987 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
988 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
989 pr_reg->pr_res_key, pr_reg->pr_res_generation,
990 pr_reg->pr_reg_aptpl);
991 }
992
993 /*
994 * this function can be called with struct se_device->dev_reservation_lock
995 * when register_move = 1
996 */
997 static void __core_scsi3_add_registration(
998 struct se_device *dev,
999 struct se_node_acl *nacl,
1000 struct t10_pr_registration *pr_reg,
1001 int register_type,
1002 int register_move)
1003 {
1004 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1005 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1006 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1007
1008 /*
1009 * Increment PRgeneration counter for struct se_device upon a successful
1010 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1011 *
1012 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1013 * action, the struct se_device->dev_reservation_lock will already be held,
1014 * so we do not call core_scsi3_pr_generation() which grabs the lock
1015 * for the REGISTER.
1016 */
1017 pr_reg->pr_res_generation = (register_move) ?
1018 dev->t10_pr.pr_generation++ :
1019 core_scsi3_pr_generation(dev);
1020
1021 spin_lock(&pr_tmpl->registration_lock);
1022 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1023 pr_reg->pr_reg_deve->def_pr_registered = 1;
1024
1025 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1026 spin_unlock(&pr_tmpl->registration_lock);
1027 /*
1028 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1029 */
1030 if (!pr_reg->pr_reg_all_tg_pt || register_move)
1031 return;
1032 /*
1033 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1034 * allocated in __core_scsi3_alloc_registration()
1035 */
1036 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1037 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1038 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1039
1040 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1041
1042 spin_lock(&pr_tmpl->registration_lock);
1043 list_add_tail(&pr_reg_tmp->pr_reg_list,
1044 &pr_tmpl->registration_list);
1045 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1046
1047 __core_scsi3_dump_registration(tfo, dev,
1048 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1049 register_type);
1050 spin_unlock(&pr_tmpl->registration_lock);
1051 /*
1052 * Drop configfs group dependency reference from
1053 * __core_scsi3_alloc_registration()
1054 */
1055 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1056 }
1057 }
1058
1059 static int core_scsi3_alloc_registration(
1060 struct se_device *dev,
1061 struct se_node_acl *nacl,
1062 struct se_dev_entry *deve,
1063 unsigned char *isid,
1064 u64 sa_res_key,
1065 int all_tg_pt,
1066 int aptpl,
1067 int register_type,
1068 int register_move)
1069 {
1070 struct t10_pr_registration *pr_reg;
1071
1072 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1073 sa_res_key, all_tg_pt, aptpl);
1074 if (!pr_reg)
1075 return -EPERM;
1076
1077 __core_scsi3_add_registration(dev, nacl, pr_reg,
1078 register_type, register_move);
1079 return 0;
1080 }
1081
1082 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1083 struct se_device *dev,
1084 struct se_node_acl *nacl,
1085 unsigned char *isid)
1086 {
1087 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1088 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1089 struct se_portal_group *tpg;
1090
1091 spin_lock(&pr_tmpl->registration_lock);
1092 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1093 &pr_tmpl->registration_list, pr_reg_list) {
1094 /*
1095 * First look for a matching struct se_node_acl
1096 */
1097 if (pr_reg->pr_reg_nacl != nacl)
1098 continue;
1099
1100 tpg = pr_reg->pr_reg_nacl->se_tpg;
1101 /*
1102 * If this registration does NOT contain a fabric provided
1103 * ISID, then we have found a match.
1104 */
1105 if (!pr_reg->isid_present_at_reg) {
1106 /*
1107 * Determine if this SCSI device server requires that
1108 * SCSI Intiatior TransportID w/ ISIDs is enforced
1109 * for fabric modules (iSCSI) requiring them.
1110 */
1111 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1112 if (dev->dev_attrib.enforce_pr_isids)
1113 continue;
1114 }
1115 atomic_inc(&pr_reg->pr_res_holders);
1116 smp_mb__after_atomic_inc();
1117 spin_unlock(&pr_tmpl->registration_lock);
1118 return pr_reg;
1119 }
1120 /*
1121 * If the *pr_reg contains a fabric defined ISID for multi-value
1122 * SCSI Initiator Port TransportIDs, then we expect a valid
1123 * matching ISID to be provided by the local SCSI Initiator Port.
1124 */
1125 if (!isid)
1126 continue;
1127 if (strcmp(isid, pr_reg->pr_reg_isid))
1128 continue;
1129
1130 atomic_inc(&pr_reg->pr_res_holders);
1131 smp_mb__after_atomic_inc();
1132 spin_unlock(&pr_tmpl->registration_lock);
1133 return pr_reg;
1134 }
1135 spin_unlock(&pr_tmpl->registration_lock);
1136
1137 return NULL;
1138 }
1139
1140 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1141 struct se_device *dev,
1142 struct se_node_acl *nacl,
1143 struct se_session *sess)
1144 {
1145 struct se_portal_group *tpg = nacl->se_tpg;
1146 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1147
1148 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1149 memset(&buf[0], 0, PR_REG_ISID_LEN);
1150 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1151 PR_REG_ISID_LEN);
1152 isid_ptr = &buf[0];
1153 }
1154
1155 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1156 }
1157
1158 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1159 {
1160 atomic_dec(&pr_reg->pr_res_holders);
1161 smp_mb__after_atomic_dec();
1162 }
1163
1164 static int core_scsi3_check_implict_release(
1165 struct se_device *dev,
1166 struct t10_pr_registration *pr_reg)
1167 {
1168 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1169 struct t10_pr_registration *pr_res_holder;
1170 int ret = 0;
1171
1172 spin_lock(&dev->dev_reservation_lock);
1173 pr_res_holder = dev->dev_pr_res_holder;
1174 if (!pr_res_holder) {
1175 spin_unlock(&dev->dev_reservation_lock);
1176 return ret;
1177 }
1178 if (pr_res_holder == pr_reg) {
1179 /*
1180 * Perform an implict RELEASE if the registration that
1181 * is being released is holding the reservation.
1182 *
1183 * From spc4r17, section 5.7.11.1:
1184 *
1185 * e) If the I_T nexus is the persistent reservation holder
1186 * and the persistent reservation is not an all registrants
1187 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1188 * service action or REGISTER AND IGNORE EXISTING KEY
1189 * service action with the SERVICE ACTION RESERVATION KEY
1190 * field set to zero (see 5.7.11.3).
1191 */
1192 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1193 ret = 1;
1194 /*
1195 * For 'All Registrants' reservation types, all existing
1196 * registrations are still processed as reservation holders
1197 * in core_scsi3_pr_seq_non_holder() after the initial
1198 * reservation holder is implictly released here.
1199 */
1200 } else if (pr_reg->pr_reg_all_tg_pt &&
1201 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1202 pr_reg->pr_reg_nacl->initiatorname)) &&
1203 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1204 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1205 " UNREGISTER while existing reservation with matching"
1206 " key 0x%016Lx is present from another SCSI Initiator"
1207 " Port\n", pr_reg->pr_res_key);
1208 ret = -EPERM;
1209 }
1210 spin_unlock(&dev->dev_reservation_lock);
1211
1212 return ret;
1213 }
1214
1215 /*
1216 * Called with struct t10_reservation->registration_lock held.
1217 */
1218 static void __core_scsi3_free_registration(
1219 struct se_device *dev,
1220 struct t10_pr_registration *pr_reg,
1221 struct list_head *preempt_and_abort_list,
1222 int dec_holders)
1223 {
1224 struct target_core_fabric_ops *tfo =
1225 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1226 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1227 char i_buf[PR_REG_ISID_ID_LEN];
1228 int prf_isid;
1229
1230 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1231 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1232 PR_REG_ISID_ID_LEN);
1233
1234 pr_reg->pr_reg_deve->def_pr_registered = 0;
1235 pr_reg->pr_reg_deve->pr_res_key = 0;
1236 list_del(&pr_reg->pr_reg_list);
1237 /*
1238 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1239 * so call core_scsi3_put_pr_reg() to decrement our reference.
1240 */
1241 if (dec_holders)
1242 core_scsi3_put_pr_reg(pr_reg);
1243 /*
1244 * Wait until all reference from any other I_T nexuses for this
1245 * *pr_reg have been released. Because list_del() is called above,
1246 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1247 * count back to zero, and we release *pr_reg.
1248 */
1249 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1250 spin_unlock(&pr_tmpl->registration_lock);
1251 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1252 tfo->get_fabric_name());
1253 cpu_relax();
1254 spin_lock(&pr_tmpl->registration_lock);
1255 }
1256
1257 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1258 " Node: %s%s\n", tfo->get_fabric_name(),
1259 pr_reg->pr_reg_nacl->initiatorname,
1260 (prf_isid) ? &i_buf[0] : "");
1261 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1262 " Port(s)\n", tfo->get_fabric_name(),
1263 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1264 dev->transport->name);
1265 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1266 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1267 pr_reg->pr_res_generation);
1268
1269 if (!preempt_and_abort_list) {
1270 pr_reg->pr_reg_deve = NULL;
1271 pr_reg->pr_reg_nacl = NULL;
1272 kfree(pr_reg->pr_aptpl_buf);
1273 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1274 return;
1275 }
1276 /*
1277 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1278 * are released once the ABORT_TASK_SET has completed..
1279 */
1280 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1281 }
1282
1283 void core_scsi3_free_pr_reg_from_nacl(
1284 struct se_device *dev,
1285 struct se_node_acl *nacl)
1286 {
1287 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1288 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1289 /*
1290 * If the passed se_node_acl matches the reservation holder,
1291 * release the reservation.
1292 */
1293 spin_lock(&dev->dev_reservation_lock);
1294 pr_res_holder = dev->dev_pr_res_holder;
1295 if ((pr_res_holder != NULL) &&
1296 (pr_res_holder->pr_reg_nacl == nacl))
1297 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1298 spin_unlock(&dev->dev_reservation_lock);
1299 /*
1300 * Release any registration associated with the struct se_node_acl.
1301 */
1302 spin_lock(&pr_tmpl->registration_lock);
1303 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1304 &pr_tmpl->registration_list, pr_reg_list) {
1305
1306 if (pr_reg->pr_reg_nacl != nacl)
1307 continue;
1308
1309 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1310 }
1311 spin_unlock(&pr_tmpl->registration_lock);
1312 }
1313
1314 void core_scsi3_free_all_registrations(
1315 struct se_device *dev)
1316 {
1317 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1318 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1319
1320 spin_lock(&dev->dev_reservation_lock);
1321 pr_res_holder = dev->dev_pr_res_holder;
1322 if (pr_res_holder != NULL) {
1323 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1324 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1325 pr_res_holder, 0);
1326 }
1327 spin_unlock(&dev->dev_reservation_lock);
1328
1329 spin_lock(&pr_tmpl->registration_lock);
1330 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1331 &pr_tmpl->registration_list, pr_reg_list) {
1332
1333 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1334 }
1335 spin_unlock(&pr_tmpl->registration_lock);
1336
1337 spin_lock(&pr_tmpl->aptpl_reg_lock);
1338 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1339 pr_reg_aptpl_list) {
1340 list_del(&pr_reg->pr_reg_aptpl_list);
1341 kfree(pr_reg->pr_aptpl_buf);
1342 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1343 }
1344 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1345 }
1346
1347 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1348 {
1349 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1350 &tpg->tpg_group.cg_item);
1351 }
1352
1353 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1354 {
1355 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1356 &tpg->tpg_group.cg_item);
1357
1358 atomic_dec(&tpg->tpg_pr_ref_count);
1359 smp_mb__after_atomic_dec();
1360 }
1361
1362 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1363 {
1364 struct se_portal_group *tpg = nacl->se_tpg;
1365
1366 if (nacl->dynamic_node_acl)
1367 return 0;
1368
1369 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1370 &nacl->acl_group.cg_item);
1371 }
1372
1373 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1374 {
1375 struct se_portal_group *tpg = nacl->se_tpg;
1376
1377 if (nacl->dynamic_node_acl) {
1378 atomic_dec(&nacl->acl_pr_ref_count);
1379 smp_mb__after_atomic_dec();
1380 return;
1381 }
1382
1383 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1384 &nacl->acl_group.cg_item);
1385
1386 atomic_dec(&nacl->acl_pr_ref_count);
1387 smp_mb__after_atomic_dec();
1388 }
1389
1390 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1391 {
1392 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1393 struct se_node_acl *nacl;
1394 struct se_portal_group *tpg;
1395 /*
1396 * For nacl->dynamic_node_acl=1
1397 */
1398 if (!lun_acl)
1399 return 0;
1400
1401 nacl = lun_acl->se_lun_nacl;
1402 tpg = nacl->se_tpg;
1403
1404 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1405 &lun_acl->se_lun_group.cg_item);
1406 }
1407
1408 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1409 {
1410 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1411 struct se_node_acl *nacl;
1412 struct se_portal_group *tpg;
1413 /*
1414 * For nacl->dynamic_node_acl=1
1415 */
1416 if (!lun_acl) {
1417 atomic_dec(&se_deve->pr_ref_count);
1418 smp_mb__after_atomic_dec();
1419 return;
1420 }
1421 nacl = lun_acl->se_lun_nacl;
1422 tpg = nacl->se_tpg;
1423
1424 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1425 &lun_acl->se_lun_group.cg_item);
1426
1427 atomic_dec(&se_deve->pr_ref_count);
1428 smp_mb__after_atomic_dec();
1429 }
1430
1431 static sense_reason_t
1432 core_scsi3_decode_spec_i_port(
1433 struct se_cmd *cmd,
1434 struct se_portal_group *tpg,
1435 unsigned char *l_isid,
1436 u64 sa_res_key,
1437 int all_tg_pt,
1438 int aptpl)
1439 {
1440 struct se_device *dev = cmd->se_dev;
1441 struct se_port *tmp_port;
1442 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1443 struct se_session *se_sess = cmd->se_sess;
1444 struct se_node_acl *dest_node_acl = NULL;
1445 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1446 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1447 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1448 LIST_HEAD(tid_dest_list);
1449 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1450 struct target_core_fabric_ops *tmp_tf_ops;
1451 unsigned char *buf;
1452 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1453 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1454 sense_reason_t ret;
1455 u32 tpdl, tid_len = 0;
1456 int dest_local_nexus, prf_isid;
1457 u32 dest_rtpi = 0;
1458
1459 memset(dest_iport, 0, 64);
1460
1461 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1462 /*
1463 * Allocate a struct pr_transport_id_holder and setup the
1464 * local_node_acl and local_se_deve pointers and add to
1465 * struct list_head tid_dest_list for add registration
1466 * processing in the loop of tid_dest_list below.
1467 */
1468 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1469 if (!tidh_new) {
1470 pr_err("Unable to allocate tidh_new\n");
1471 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1472 }
1473 INIT_LIST_HEAD(&tidh_new->dest_list);
1474 tidh_new->dest_tpg = tpg;
1475 tidh_new->dest_node_acl = se_sess->se_node_acl;
1476 tidh_new->dest_se_deve = local_se_deve;
1477
1478 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1479 se_sess->se_node_acl, local_se_deve, l_isid,
1480 sa_res_key, all_tg_pt, aptpl);
1481 if (!local_pr_reg) {
1482 kfree(tidh_new);
1483 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1484 }
1485 tidh_new->dest_pr_reg = local_pr_reg;
1486 /*
1487 * The local I_T nexus does not hold any configfs dependances,
1488 * so we set tid_h->dest_local_nexus=1 to prevent the
1489 * configfs_undepend_item() calls in the tid_dest_list loops below.
1490 */
1491 tidh_new->dest_local_nexus = 1;
1492 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1493
1494 if (cmd->data_length < 28) {
1495 pr_warn("SPC-PR: Received PR OUT parameter list"
1496 " length too small: %u\n", cmd->data_length);
1497 ret = TCM_INVALID_PARAMETER_LIST;
1498 goto out;
1499 }
1500
1501 buf = transport_kmap_data_sg(cmd);
1502 if (!buf) {
1503 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1504 goto out;
1505 }
1506
1507 /*
1508 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1509 * first extract TransportID Parameter Data Length, and make sure
1510 * the value matches up to the SCSI expected data transfer length.
1511 */
1512 tpdl = (buf[24] & 0xff) << 24;
1513 tpdl |= (buf[25] & 0xff) << 16;
1514 tpdl |= (buf[26] & 0xff) << 8;
1515 tpdl |= buf[27] & 0xff;
1516
1517 if ((tpdl + 28) != cmd->data_length) {
1518 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1519 " does not equal CDB data_length: %u\n", tpdl,
1520 cmd->data_length);
1521 ret = TCM_INVALID_PARAMETER_LIST;
1522 goto out_unmap;
1523 }
1524 /*
1525 * Start processing the received transport IDs using the
1526 * receiving I_T Nexus portal's fabric dependent methods to
1527 * obtain the SCSI Initiator Port/Device Identifiers.
1528 */
1529 ptr = &buf[28];
1530
1531 while (tpdl > 0) {
1532 proto_ident = (ptr[0] & 0x0f);
1533 dest_tpg = NULL;
1534
1535 spin_lock(&dev->se_port_lock);
1536 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1537 tmp_tpg = tmp_port->sep_tpg;
1538 if (!tmp_tpg)
1539 continue;
1540 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1541 if (!tmp_tf_ops)
1542 continue;
1543 if (!tmp_tf_ops->get_fabric_proto_ident ||
1544 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1545 continue;
1546 /*
1547 * Look for the matching proto_ident provided by
1548 * the received TransportID
1549 */
1550 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1551 if (tmp_proto_ident != proto_ident)
1552 continue;
1553 dest_rtpi = tmp_port->sep_rtpi;
1554
1555 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1556 tmp_tpg, (const char *)ptr, &tid_len,
1557 &iport_ptr);
1558 if (!i_str)
1559 continue;
1560
1561 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1562 smp_mb__after_atomic_inc();
1563 spin_unlock(&dev->se_port_lock);
1564
1565 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1566 pr_err(" core_scsi3_tpg_depend_item()"
1567 " for tmp_tpg\n");
1568 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1569 smp_mb__after_atomic_dec();
1570 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1571 goto out_unmap;
1572 }
1573 /*
1574 * Locate the destination initiator ACL to be registered
1575 * from the decoded fabric module specific TransportID
1576 * at *i_str.
1577 */
1578 spin_lock_irq(&tmp_tpg->acl_node_lock);
1579 dest_node_acl = __core_tpg_get_initiator_node_acl(
1580 tmp_tpg, i_str);
1581 if (dest_node_acl) {
1582 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1583 smp_mb__after_atomic_inc();
1584 }
1585 spin_unlock_irq(&tmp_tpg->acl_node_lock);
1586
1587 if (!dest_node_acl) {
1588 core_scsi3_tpg_undepend_item(tmp_tpg);
1589 spin_lock(&dev->se_port_lock);
1590 continue;
1591 }
1592
1593 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1594 pr_err("configfs_depend_item() failed"
1595 " for dest_node_acl->acl_group\n");
1596 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1597 smp_mb__after_atomic_dec();
1598 core_scsi3_tpg_undepend_item(tmp_tpg);
1599 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1600 goto out_unmap;
1601 }
1602
1603 dest_tpg = tmp_tpg;
1604 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1605 " %s Port RTPI: %hu\n",
1606 dest_tpg->se_tpg_tfo->get_fabric_name(),
1607 dest_node_acl->initiatorname, dest_rtpi);
1608
1609 spin_lock(&dev->se_port_lock);
1610 break;
1611 }
1612 spin_unlock(&dev->se_port_lock);
1613
1614 if (!dest_tpg) {
1615 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1616 " dest_tpg\n");
1617 ret = TCM_INVALID_PARAMETER_LIST;
1618 goto out_unmap;
1619 }
1620
1621 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1622 " tid_len: %d for %s + %s\n",
1623 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1624 tpdl, tid_len, i_str, iport_ptr);
1625
1626 if (tid_len > tpdl) {
1627 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1628 " %u for Transport ID: %s\n", tid_len, ptr);
1629 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1630 core_scsi3_tpg_undepend_item(dest_tpg);
1631 ret = TCM_INVALID_PARAMETER_LIST;
1632 goto out_unmap;
1633 }
1634 /*
1635 * Locate the desintation struct se_dev_entry pointer for matching
1636 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1637 * Target Port.
1638 */
1639 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1640 dest_rtpi);
1641 if (!dest_se_deve) {
1642 pr_err("Unable to locate %s dest_se_deve"
1643 " from destination RTPI: %hu\n",
1644 dest_tpg->se_tpg_tfo->get_fabric_name(),
1645 dest_rtpi);
1646
1647 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1648 core_scsi3_tpg_undepend_item(dest_tpg);
1649 ret = TCM_INVALID_PARAMETER_LIST;
1650 goto out_unmap;
1651 }
1652
1653 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1654 pr_err("core_scsi3_lunacl_depend_item()"
1655 " failed\n");
1656 atomic_dec(&dest_se_deve->pr_ref_count);
1657 smp_mb__after_atomic_dec();
1658 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1659 core_scsi3_tpg_undepend_item(dest_tpg);
1660 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1661 goto out_unmap;
1662 }
1663
1664 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1665 " dest_se_deve mapped_lun: %u\n",
1666 dest_tpg->se_tpg_tfo->get_fabric_name(),
1667 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1668
1669 /*
1670 * Skip any TransportIDs that already have a registration for
1671 * this target port.
1672 */
1673 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1674 iport_ptr);
1675 if (pr_reg_e) {
1676 core_scsi3_put_pr_reg(pr_reg_e);
1677 core_scsi3_lunacl_undepend_item(dest_se_deve);
1678 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1679 core_scsi3_tpg_undepend_item(dest_tpg);
1680 ptr += tid_len;
1681 tpdl -= tid_len;
1682 tid_len = 0;
1683 continue;
1684 }
1685 /*
1686 * Allocate a struct pr_transport_id_holder and setup
1687 * the dest_node_acl and dest_se_deve pointers for the
1688 * loop below.
1689 */
1690 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1691 GFP_KERNEL);
1692 if (!tidh_new) {
1693 pr_err("Unable to allocate tidh_new\n");
1694 core_scsi3_lunacl_undepend_item(dest_se_deve);
1695 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1696 core_scsi3_tpg_undepend_item(dest_tpg);
1697 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1698 goto out_unmap;
1699 }
1700 INIT_LIST_HEAD(&tidh_new->dest_list);
1701 tidh_new->dest_tpg = dest_tpg;
1702 tidh_new->dest_node_acl = dest_node_acl;
1703 tidh_new->dest_se_deve = dest_se_deve;
1704
1705 /*
1706 * Allocate, but do NOT add the registration for the
1707 * TransportID referenced SCSI Initiator port. This
1708 * done because of the following from spc4r17 in section
1709 * 6.14.3 wrt SPEC_I_PT:
1710 *
1711 * "If a registration fails for any initiator port (e.g., if th
1712 * logical unit does not have enough resources available to
1713 * hold the registration information), no registrations shall be
1714 * made, and the command shall be terminated with
1715 * CHECK CONDITION status."
1716 *
1717 * That means we call __core_scsi3_alloc_registration() here,
1718 * and then call __core_scsi3_add_registration() in the
1719 * 2nd loop which will never fail.
1720 */
1721 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1722 dest_node_acl, dest_se_deve, iport_ptr,
1723 sa_res_key, all_tg_pt, aptpl);
1724 if (!dest_pr_reg) {
1725 core_scsi3_lunacl_undepend_item(dest_se_deve);
1726 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1727 core_scsi3_tpg_undepend_item(dest_tpg);
1728 kfree(tidh_new);
1729 ret = TCM_INVALID_PARAMETER_LIST;
1730 goto out_unmap;
1731 }
1732 tidh_new->dest_pr_reg = dest_pr_reg;
1733 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1734
1735 ptr += tid_len;
1736 tpdl -= tid_len;
1737 tid_len = 0;
1738
1739 }
1740
1741 transport_kunmap_data_sg(cmd);
1742
1743 /*
1744 * Go ahead and create a registrations from tid_dest_list for the
1745 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1746 * and dest_se_deve.
1747 *
1748 * The SA Reservation Key from the PROUT is set for the
1749 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1750 * means that the TransportID Initiator port will be
1751 * registered on all of the target ports in the SCSI target device
1752 * ALL_TG_PT=0 means the registration will only be for the
1753 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1754 * was received.
1755 */
1756 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1757 dest_tpg = tidh->dest_tpg;
1758 dest_node_acl = tidh->dest_node_acl;
1759 dest_se_deve = tidh->dest_se_deve;
1760 dest_pr_reg = tidh->dest_pr_reg;
1761 dest_local_nexus = tidh->dest_local_nexus;
1762
1763 list_del(&tidh->dest_list);
1764 kfree(tidh);
1765
1766 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1767 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1768 PR_REG_ISID_ID_LEN);
1769
1770 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1771 dest_pr_reg, 0, 0);
1772
1773 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1774 " registered Transport ID for Node: %s%s Mapped LUN:"
1775 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1776 dest_node_acl->initiatorname, (prf_isid) ?
1777 &i_buf[0] : "", dest_se_deve->mapped_lun);
1778
1779 if (dest_local_nexus)
1780 continue;
1781
1782 core_scsi3_lunacl_undepend_item(dest_se_deve);
1783 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1784 core_scsi3_tpg_undepend_item(dest_tpg);
1785 }
1786
1787 return 0;
1788 out_unmap:
1789 transport_kunmap_data_sg(cmd);
1790 out:
1791 /*
1792 * For the failure case, release everything from tid_dest_list
1793 * including *dest_pr_reg and the configfs dependances..
1794 */
1795 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1796 dest_tpg = tidh->dest_tpg;
1797 dest_node_acl = tidh->dest_node_acl;
1798 dest_se_deve = tidh->dest_se_deve;
1799 dest_pr_reg = tidh->dest_pr_reg;
1800 dest_local_nexus = tidh->dest_local_nexus;
1801
1802 list_del(&tidh->dest_list);
1803 kfree(tidh);
1804 /*
1805 * Release any extra ALL_TG_PT=1 registrations for
1806 * the SPEC_I_PT=1 case.
1807 */
1808 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1809 &dest_pr_reg->pr_reg_atp_list,
1810 pr_reg_atp_mem_list) {
1811 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1812 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1813 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1814 }
1815
1816 kfree(dest_pr_reg->pr_aptpl_buf);
1817 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1818
1819 if (dest_local_nexus)
1820 continue;
1821
1822 core_scsi3_lunacl_undepend_item(dest_se_deve);
1823 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1824 core_scsi3_tpg_undepend_item(dest_tpg);
1825 }
1826 return ret;
1827 }
1828
1829 /*
1830 * Called with struct se_device->dev_reservation_lock held
1831 */
1832 static int __core_scsi3_update_aptpl_buf(
1833 struct se_device *dev,
1834 unsigned char *buf,
1835 u32 pr_aptpl_buf_len,
1836 int clear_aptpl_metadata)
1837 {
1838 struct se_lun *lun;
1839 struct se_portal_group *tpg;
1840 struct t10_pr_registration *pr_reg;
1841 unsigned char tmp[512], isid_buf[32];
1842 ssize_t len = 0;
1843 int reg_count = 0;
1844
1845 memset(buf, 0, pr_aptpl_buf_len);
1846 /*
1847 * Called to clear metadata once APTPL has been deactivated.
1848 */
1849 if (clear_aptpl_metadata) {
1850 snprintf(buf, pr_aptpl_buf_len,
1851 "No Registrations or Reservations\n");
1852 return 0;
1853 }
1854 /*
1855 * Walk the registration list..
1856 */
1857 spin_lock(&dev->t10_pr.registration_lock);
1858 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1859 pr_reg_list) {
1860
1861 tmp[0] = '\0';
1862 isid_buf[0] = '\0';
1863 tpg = pr_reg->pr_reg_nacl->se_tpg;
1864 lun = pr_reg->pr_reg_tg_pt_lun;
1865 /*
1866 * Write out any ISID value to APTPL metadata that was included
1867 * in the original registration.
1868 */
1869 if (pr_reg->isid_present_at_reg)
1870 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1871 pr_reg->pr_reg_isid);
1872 /*
1873 * Include special metadata if the pr_reg matches the
1874 * reservation holder.
1875 */
1876 if (dev->dev_pr_res_holder == pr_reg) {
1877 snprintf(tmp, 512, "PR_REG_START: %d"
1878 "\ninitiator_fabric=%s\n"
1879 "initiator_node=%s\n%s"
1880 "sa_res_key=%llu\n"
1881 "res_holder=1\nres_type=%02x\n"
1882 "res_scope=%02x\nres_all_tg_pt=%d\n"
1883 "mapped_lun=%u\n", reg_count,
1884 tpg->se_tpg_tfo->get_fabric_name(),
1885 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1886 pr_reg->pr_res_key, pr_reg->pr_res_type,
1887 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1888 pr_reg->pr_res_mapped_lun);
1889 } else {
1890 snprintf(tmp, 512, "PR_REG_START: %d\n"
1891 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1892 "sa_res_key=%llu\nres_holder=0\n"
1893 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1894 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1895 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1896 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1897 pr_reg->pr_res_mapped_lun);
1898 }
1899
1900 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1901 pr_err("Unable to update renaming"
1902 " APTPL metadata\n");
1903 spin_unlock(&dev->t10_pr.registration_lock);
1904 return -EMSGSIZE;
1905 }
1906 len += sprintf(buf+len, "%s", tmp);
1907
1908 /*
1909 * Include information about the associated SCSI target port.
1910 */
1911 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1912 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1913 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1914 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1915 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1916 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1917
1918 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1919 pr_err("Unable to update renaming"
1920 " APTPL metadata\n");
1921 spin_unlock(&dev->t10_pr.registration_lock);
1922 return -EMSGSIZE;
1923 }
1924 len += sprintf(buf+len, "%s", tmp);
1925 reg_count++;
1926 }
1927 spin_unlock(&dev->t10_pr.registration_lock);
1928
1929 if (!reg_count)
1930 len += sprintf(buf+len, "No Registrations or Reservations");
1931
1932 return 0;
1933 }
1934
1935 static int core_scsi3_update_aptpl_buf(
1936 struct se_device *dev,
1937 unsigned char *buf,
1938 u32 pr_aptpl_buf_len,
1939 int clear_aptpl_metadata)
1940 {
1941 int ret;
1942
1943 spin_lock(&dev->dev_reservation_lock);
1944 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1945 clear_aptpl_metadata);
1946 spin_unlock(&dev->dev_reservation_lock);
1947
1948 return ret;
1949 }
1950
1951 /*
1952 * Called with struct se_device->aptpl_file_mutex held
1953 */
1954 static int __core_scsi3_write_aptpl_to_file(
1955 struct se_device *dev,
1956 unsigned char *buf,
1957 u32 pr_aptpl_buf_len)
1958 {
1959 struct t10_wwn *wwn = &dev->t10_wwn;
1960 struct file *file;
1961 int flags = O_RDWR | O_CREAT | O_TRUNC;
1962 char path[512];
1963 int ret;
1964
1965 memset(path, 0, 512);
1966
1967 if (strlen(&wwn->unit_serial[0]) >= 512) {
1968 pr_err("WWN value for struct se_device does not fit"
1969 " into path buffer\n");
1970 return -EMSGSIZE;
1971 }
1972
1973 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1974 file = filp_open(path, flags, 0600);
1975 if (IS_ERR(file)) {
1976 pr_err("filp_open(%s) for APTPL metadata"
1977 " failed\n", path);
1978 return PTR_ERR(file);
1979 }
1980
1981 if (!pr_aptpl_buf_len)
1982 pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
1983
1984 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1985
1986 if (ret < 0)
1987 pr_debug("Error writing APTPL metadata file: %s\n", path);
1988 fput(file);
1989
1990 return ret ? -EIO : 0;
1991 }
1992
1993 static int
1994 core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf,
1995 u32 in_pr_aptpl_buf_len)
1996 {
1997 unsigned char null_buf[64], *buf;
1998 u32 pr_aptpl_buf_len;
1999 int clear_aptpl_metadata = 0;
2000 int ret;
2001
2002 /*
2003 * Can be called with a NULL pointer from PROUT service action CLEAR
2004 */
2005 if (!in_buf) {
2006 memset(null_buf, 0, 64);
2007 buf = &null_buf[0];
2008 /*
2009 * This will clear the APTPL metadata to:
2010 * "No Registrations or Reservations" status
2011 */
2012 pr_aptpl_buf_len = 64;
2013 clear_aptpl_metadata = 1;
2014 } else {
2015 buf = in_buf;
2016 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2017 }
2018
2019 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2020 clear_aptpl_metadata);
2021 if (ret != 0)
2022 return ret;
2023
2024 /*
2025 * __core_scsi3_write_aptpl_to_file() will call strlen()
2026 * on the passed buf to determine pr_aptpl_buf_len.
2027 */
2028 return __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2029 }
2030
2031 static sense_reason_t
2032 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2033 int aptpl, int all_tg_pt, int spec_i_pt, int ignore_key)
2034 {
2035 struct se_session *se_sess = cmd->se_sess;
2036 struct se_device *dev = cmd->se_dev;
2037 struct se_dev_entry *se_deve;
2038 struct se_lun *se_lun = cmd->se_lun;
2039 struct se_portal_group *se_tpg;
2040 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2041 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2042 /* Used for APTPL metadata w/ UNREGISTER */
2043 unsigned char *pr_aptpl_buf = NULL;
2044 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2045 sense_reason_t ret = TCM_NO_SENSE;
2046 int pr_holder = 0, type;
2047
2048 if (!se_sess || !se_lun) {
2049 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2050 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2051 }
2052 se_tpg = se_sess->se_tpg;
2053 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2054
2055 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2056 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2057 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2058 PR_REG_ISID_LEN);
2059 isid_ptr = &isid_buf[0];
2060 }
2061 /*
2062 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2063 */
2064 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2065 if (!pr_reg_e) {
2066 if (res_key) {
2067 pr_warn("SPC-3 PR: Reservation Key non-zero"
2068 " for SA REGISTER, returning CONFLICT\n");
2069 return TCM_RESERVATION_CONFLICT;
2070 }
2071 /*
2072 * Do nothing but return GOOD status.
2073 */
2074 if (!sa_res_key)
2075 return 0;
2076
2077 if (!spec_i_pt) {
2078 /*
2079 * Perform the Service Action REGISTER on the Initiator
2080 * Port Endpoint that the PRO was received from on the
2081 * Logical Unit of the SCSI device server.
2082 */
2083 if (core_scsi3_alloc_registration(cmd->se_dev,
2084 se_sess->se_node_acl, se_deve, isid_ptr,
2085 sa_res_key, all_tg_pt, aptpl,
2086 ignore_key, 0)) {
2087 pr_err("Unable to allocate"
2088 " struct t10_pr_registration\n");
2089 return TCM_INVALID_PARAMETER_LIST;
2090 }
2091 } else {
2092 /*
2093 * Register both the Initiator port that received
2094 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2095 * TransportID from Parameter list and loop through
2096 * fabric dependent parameter list while calling
2097 * logic from of core_scsi3_alloc_registration() for
2098 * each TransportID provided SCSI Initiator Port/Device
2099 */
2100 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2101 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2102 if (ret != 0)
2103 return ret;
2104 }
2105 /*
2106 * Nothing left to do for the APTPL=0 case.
2107 */
2108 if (!aptpl) {
2109 pr_tmpl->pr_aptpl_active = 0;
2110 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2111 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2112 " REGISTER\n");
2113 return 0;
2114 }
2115 /*
2116 * Locate the newly allocated local I_T Nexus *pr_reg, and
2117 * update the APTPL metadata information using its
2118 * preallocated *pr_reg->pr_aptpl_buf.
2119 */
2120 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2121 se_sess->se_node_acl, se_sess);
2122
2123 if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
2124 &pr_reg->pr_aptpl_buf[0],
2125 pr_tmpl->pr_aptpl_buf_len)) {
2126 pr_tmpl->pr_aptpl_active = 1;
2127 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2128 }
2129
2130 goto out_put_pr_reg;
2131 }
2132
2133 /*
2134 * Locate the existing *pr_reg via struct se_node_acl pointers
2135 */
2136 pr_reg = pr_reg_e;
2137 type = pr_reg->pr_res_type;
2138
2139 if (!ignore_key) {
2140 if (res_key != pr_reg->pr_res_key) {
2141 pr_err("SPC-3 PR REGISTER: Received"
2142 " res_key: 0x%016Lx does not match"
2143 " existing SA REGISTER res_key:"
2144 " 0x%016Lx\n", res_key,
2145 pr_reg->pr_res_key);
2146 ret = TCM_RESERVATION_CONFLICT;
2147 goto out_put_pr_reg;
2148 }
2149 }
2150
2151 if (spec_i_pt) {
2152 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2153 " set while sa_res_key=0\n");
2154 ret = TCM_INVALID_PARAMETER_LIST;
2155 goto out_put_pr_reg;
2156 }
2157
2158 /*
2159 * An existing ALL_TG_PT=1 registration being released
2160 * must also set ALL_TG_PT=1 in the incoming PROUT.
2161 */
2162 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2163 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2164 " registration exists, but ALL_TG_PT=1 bit not"
2165 " present in received PROUT\n");
2166 ret = TCM_INVALID_CDB_FIELD;
2167 goto out_put_pr_reg;
2168 }
2169
2170 /*
2171 * Allocate APTPL metadata buffer used for UNREGISTER ops
2172 */
2173 if (aptpl) {
2174 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2175 GFP_KERNEL);
2176 if (!pr_aptpl_buf) {
2177 pr_err("Unable to allocate"
2178 " pr_aptpl_buf\n");
2179 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2180 goto out_put_pr_reg;
2181 }
2182 }
2183
2184 /*
2185 * sa_res_key=0 Unregister Reservation Key for registered I_T
2186 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2187 * Nexus.
2188 */
2189 if (!sa_res_key) {
2190 pr_holder = core_scsi3_check_implict_release(
2191 cmd->se_dev, pr_reg);
2192 if (pr_holder < 0) {
2193 kfree(pr_aptpl_buf);
2194 ret = TCM_RESERVATION_CONFLICT;
2195 goto out_put_pr_reg;
2196 }
2197
2198 spin_lock(&pr_tmpl->registration_lock);
2199 /*
2200 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2201 * and matching pr_res_key.
2202 */
2203 if (pr_reg->pr_reg_all_tg_pt) {
2204 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2205 &pr_tmpl->registration_list,
2206 pr_reg_list) {
2207
2208 if (!pr_reg_p->pr_reg_all_tg_pt)
2209 continue;
2210 if (pr_reg_p->pr_res_key != res_key)
2211 continue;
2212 if (pr_reg == pr_reg_p)
2213 continue;
2214 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2215 pr_reg_p->pr_reg_nacl->initiatorname))
2216 continue;
2217
2218 __core_scsi3_free_registration(dev,
2219 pr_reg_p, NULL, 0);
2220 }
2221 }
2222
2223 /*
2224 * Release the calling I_T Nexus registration now..
2225 */
2226 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2227
2228 /*
2229 * From spc4r17, section 5.7.11.3 Unregistering
2230 *
2231 * If the persistent reservation is a registrants only
2232 * type, the device server shall establish a unit
2233 * attention condition for the initiator port associated
2234 * with every registered I_T nexus except for the I_T
2235 * nexus on which the PERSISTENT RESERVE OUT command was
2236 * received, with the additional sense code set to
2237 * RESERVATIONS RELEASED.
2238 */
2239 if (pr_holder &&
2240 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2241 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2242 list_for_each_entry(pr_reg_p,
2243 &pr_tmpl->registration_list,
2244 pr_reg_list) {
2245
2246 core_scsi3_ua_allocate(
2247 pr_reg_p->pr_reg_nacl,
2248 pr_reg_p->pr_res_mapped_lun,
2249 0x2A,
2250 ASCQ_2AH_RESERVATIONS_RELEASED);
2251 }
2252 }
2253 spin_unlock(&pr_tmpl->registration_lock);
2254
2255 if (!aptpl) {
2256 pr_tmpl->pr_aptpl_active = 0;
2257 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2258 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2259 " for UNREGISTER\n");
2260 return 0;
2261 }
2262
2263 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2264 pr_tmpl->pr_aptpl_buf_len)) {
2265 pr_tmpl->pr_aptpl_active = 1;
2266 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2267 " for UNREGISTER\n");
2268 }
2269
2270 goto out_free_aptpl_buf;
2271 }
2272
2273 /*
2274 * Increment PRgeneration counter for struct se_device"
2275 * upon a successful REGISTER, see spc4r17 section 6.3.2
2276 * READ_KEYS service action.
2277 */
2278 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2279 pr_reg->pr_res_key = sa_res_key;
2280 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2281 " Key for %s to: 0x%016Lx PRgeneration:"
2282 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2283 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2284 pr_reg->pr_reg_nacl->initiatorname,
2285 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2286
2287 if (!aptpl) {
2288 pr_tmpl->pr_aptpl_active = 0;
2289 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2290 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2291 " for REGISTER\n");
2292 ret = 0;
2293 goto out_put_pr_reg;
2294 }
2295
2296 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2297 pr_tmpl->pr_aptpl_buf_len)) {
2298 pr_tmpl->pr_aptpl_active = 1;
2299 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2300 " for REGISTER\n");
2301 }
2302
2303 out_free_aptpl_buf:
2304 kfree(pr_aptpl_buf);
2305 ret = 0;
2306 out_put_pr_reg:
2307 core_scsi3_put_pr_reg(pr_reg);
2308 return ret;
2309 }
2310
2311 unsigned char *core_scsi3_pr_dump_type(int type)
2312 {
2313 switch (type) {
2314 case PR_TYPE_WRITE_EXCLUSIVE:
2315 return "Write Exclusive Access";
2316 case PR_TYPE_EXCLUSIVE_ACCESS:
2317 return "Exclusive Access";
2318 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2319 return "Write Exclusive Access, Registrants Only";
2320 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2321 return "Exclusive Access, Registrants Only";
2322 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2323 return "Write Exclusive Access, All Registrants";
2324 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2325 return "Exclusive Access, All Registrants";
2326 default:
2327 break;
2328 }
2329
2330 return "Unknown SPC-3 PR Type";
2331 }
2332
2333 static sense_reason_t
2334 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2335 {
2336 struct se_device *dev = cmd->se_dev;
2337 struct se_session *se_sess = cmd->se_sess;
2338 struct se_lun *se_lun = cmd->se_lun;
2339 struct t10_pr_registration *pr_reg, *pr_res_holder;
2340 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2341 char i_buf[PR_REG_ISID_ID_LEN];
2342 sense_reason_t ret;
2343 int prf_isid;
2344
2345 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2346
2347 if (!se_sess || !se_lun) {
2348 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2349 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2350 }
2351 /*
2352 * Locate the existing *pr_reg via struct se_node_acl pointers
2353 */
2354 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2355 se_sess);
2356 if (!pr_reg) {
2357 pr_err("SPC-3 PR: Unable to locate"
2358 " PR_REGISTERED *pr_reg for RESERVE\n");
2359 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2360 }
2361 /*
2362 * From spc4r17 Section 5.7.9: Reserving:
2363 *
2364 * An application client creates a persistent reservation by issuing
2365 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2366 * a registered I_T nexus with the following parameters:
2367 * a) RESERVATION KEY set to the value of the reservation key that is
2368 * registered with the logical unit for the I_T nexus; and
2369 */
2370 if (res_key != pr_reg->pr_res_key) {
2371 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2372 " does not match existing SA REGISTER res_key:"
2373 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2374 ret = TCM_RESERVATION_CONFLICT;
2375 goto out_put_pr_reg;
2376 }
2377 /*
2378 * From spc4r17 Section 5.7.9: Reserving:
2379 *
2380 * From above:
2381 * b) TYPE field and SCOPE field set to the persistent reservation
2382 * being created.
2383 *
2384 * Only one persistent reservation is allowed at a time per logical unit
2385 * and that persistent reservation has a scope of LU_SCOPE.
2386 */
2387 if (scope != PR_SCOPE_LU_SCOPE) {
2388 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2389 ret = TCM_INVALID_PARAMETER_LIST;
2390 goto out_put_pr_reg;
2391 }
2392 /*
2393 * See if we have an existing PR reservation holder pointer at
2394 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2395 * *pr_res_holder.
2396 */
2397 spin_lock(&dev->dev_reservation_lock);
2398 pr_res_holder = dev->dev_pr_res_holder;
2399 if (pr_res_holder) {
2400 /*
2401 * From spc4r17 Section 5.7.9: Reserving:
2402 *
2403 * If the device server receives a PERSISTENT RESERVE OUT
2404 * command from an I_T nexus other than a persistent reservation
2405 * holder (see 5.7.10) that attempts to create a persistent
2406 * reservation when a persistent reservation already exists for
2407 * the logical unit, then the command shall be completed with
2408 * RESERVATION CONFLICT status.
2409 */
2410 if (pr_res_holder != pr_reg) {
2411 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2412 pr_err("SPC-3 PR: Attempted RESERVE from"
2413 " [%s]: %s while reservation already held by"
2414 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2415 cmd->se_tfo->get_fabric_name(),
2416 se_sess->se_node_acl->initiatorname,
2417 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2418 pr_res_holder->pr_reg_nacl->initiatorname);
2419
2420 spin_unlock(&dev->dev_reservation_lock);
2421 ret = TCM_RESERVATION_CONFLICT;
2422 goto out_put_pr_reg;
2423 }
2424 /*
2425 * From spc4r17 Section 5.7.9: Reserving:
2426 *
2427 * If a persistent reservation holder attempts to modify the
2428 * type or scope of an existing persistent reservation, the
2429 * command shall be completed with RESERVATION CONFLICT status.
2430 */
2431 if ((pr_res_holder->pr_res_type != type) ||
2432 (pr_res_holder->pr_res_scope != scope)) {
2433 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2434 pr_err("SPC-3 PR: Attempted RESERVE from"
2435 " [%s]: %s trying to change TYPE and/or SCOPE,"
2436 " while reservation already held by [%s]: %s,"
2437 " returning RESERVATION_CONFLICT\n",
2438 cmd->se_tfo->get_fabric_name(),
2439 se_sess->se_node_acl->initiatorname,
2440 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2441 pr_res_holder->pr_reg_nacl->initiatorname);
2442
2443 spin_unlock(&dev->dev_reservation_lock);
2444 ret = TCM_RESERVATION_CONFLICT;
2445 goto out_put_pr_reg;
2446 }
2447 /*
2448 * From spc4r17 Section 5.7.9: Reserving:
2449 *
2450 * If the device server receives a PERSISTENT RESERVE OUT
2451 * command with RESERVE service action where the TYPE field and
2452 * the SCOPE field contain the same values as the existing type
2453 * and scope from a persistent reservation holder, it shall not
2454 * make any change to the existing persistent reservation and
2455 * shall completethe command with GOOD status.
2456 */
2457 spin_unlock(&dev->dev_reservation_lock);
2458 ret = 0;
2459 goto out_put_pr_reg;
2460 }
2461 /*
2462 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2463 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2464 */
2465 pr_reg->pr_res_scope = scope;
2466 pr_reg->pr_res_type = type;
2467 pr_reg->pr_res_holder = 1;
2468 dev->dev_pr_res_holder = pr_reg;
2469 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2470 PR_REG_ISID_ID_LEN);
2471
2472 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2473 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2474 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2475 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2476 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2477 cmd->se_tfo->get_fabric_name(),
2478 se_sess->se_node_acl->initiatorname,
2479 (prf_isid) ? &i_buf[0] : "");
2480 spin_unlock(&dev->dev_reservation_lock);
2481
2482 if (pr_tmpl->pr_aptpl_active) {
2483 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2484 &pr_reg->pr_aptpl_buf[0],
2485 pr_tmpl->pr_aptpl_buf_len)) {
2486 pr_debug("SPC-3 PR: Updated APTPL metadata"
2487 " for RESERVE\n");
2488 }
2489 }
2490
2491 ret = 0;
2492 out_put_pr_reg:
2493 core_scsi3_put_pr_reg(pr_reg);
2494 return ret;
2495 }
2496
2497 static sense_reason_t
2498 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2499 u64 res_key)
2500 {
2501 switch (type) {
2502 case PR_TYPE_WRITE_EXCLUSIVE:
2503 case PR_TYPE_EXCLUSIVE_ACCESS:
2504 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2505 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2506 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2507 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2508 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2509 default:
2510 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2511 " 0x%02x\n", type);
2512 return TCM_INVALID_CDB_FIELD;
2513 }
2514 }
2515
2516 /*
2517 * Called with struct se_device->dev_reservation_lock held.
2518 */
2519 static void __core_scsi3_complete_pro_release(
2520 struct se_device *dev,
2521 struct se_node_acl *se_nacl,
2522 struct t10_pr_registration *pr_reg,
2523 int explict)
2524 {
2525 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2526 char i_buf[PR_REG_ISID_ID_LEN];
2527 int prf_isid;
2528
2529 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2530 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2531 PR_REG_ISID_ID_LEN);
2532 /*
2533 * Go ahead and release the current PR reservation holder.
2534 */
2535 dev->dev_pr_res_holder = NULL;
2536
2537 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2538 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2539 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2540 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2541 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2542 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2543 tfo->get_fabric_name(), se_nacl->initiatorname,
2544 (prf_isid) ? &i_buf[0] : "");
2545 /*
2546 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2547 */
2548 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2549 }
2550
2551 static sense_reason_t
2552 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2553 u64 res_key)
2554 {
2555 struct se_device *dev = cmd->se_dev;
2556 struct se_session *se_sess = cmd->se_sess;
2557 struct se_lun *se_lun = cmd->se_lun;
2558 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2559 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2560 int all_reg = 0;
2561 sense_reason_t ret = 0;
2562
2563 if (!se_sess || !se_lun) {
2564 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2565 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2566 }
2567 /*
2568 * Locate the existing *pr_reg via struct se_node_acl pointers
2569 */
2570 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2571 if (!pr_reg) {
2572 pr_err("SPC-3 PR: Unable to locate"
2573 " PR_REGISTERED *pr_reg for RELEASE\n");
2574 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2575 }
2576 /*
2577 * From spc4r17 Section 5.7.11.2 Releasing:
2578 *
2579 * If there is no persistent reservation or in response to a persistent
2580 * reservation release request from a registered I_T nexus that is not a
2581 * persistent reservation holder (see 5.7.10), the device server shall
2582 * do the following:
2583 *
2584 * a) Not release the persistent reservation, if any;
2585 * b) Not remove any registrations; and
2586 * c) Complete the command with GOOD status.
2587 */
2588 spin_lock(&dev->dev_reservation_lock);
2589 pr_res_holder = dev->dev_pr_res_holder;
2590 if (!pr_res_holder) {
2591 /*
2592 * No persistent reservation, return GOOD status.
2593 */
2594 spin_unlock(&dev->dev_reservation_lock);
2595 goto out_put_pr_reg;
2596 }
2597 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2598 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2599 all_reg = 1;
2600
2601 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2602 /*
2603 * Non 'All Registrants' PR Type cases..
2604 * Release request from a registered I_T nexus that is not a
2605 * persistent reservation holder. return GOOD status.
2606 */
2607 spin_unlock(&dev->dev_reservation_lock);
2608 goto out_put_pr_reg;
2609 }
2610
2611 /*
2612 * From spc4r17 Section 5.7.11.2 Releasing:
2613 *
2614 * Only the persistent reservation holder (see 5.7.10) is allowed to
2615 * release a persistent reservation.
2616 *
2617 * An application client releases the persistent reservation by issuing
2618 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2619 * an I_T nexus that is a persistent reservation holder with the
2620 * following parameters:
2621 *
2622 * a) RESERVATION KEY field set to the value of the reservation key
2623 * that is registered with the logical unit for the I_T nexus;
2624 */
2625 if (res_key != pr_reg->pr_res_key) {
2626 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2627 " does not match existing SA REGISTER res_key:"
2628 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2629 spin_unlock(&dev->dev_reservation_lock);
2630 ret = TCM_RESERVATION_CONFLICT;
2631 goto out_put_pr_reg;
2632 }
2633 /*
2634 * From spc4r17 Section 5.7.11.2 Releasing and above:
2635 *
2636 * b) TYPE field and SCOPE field set to match the persistent
2637 * reservation being released.
2638 */
2639 if ((pr_res_holder->pr_res_type != type) ||
2640 (pr_res_holder->pr_res_scope != scope)) {
2641 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2642 pr_err("SPC-3 PR RELEASE: Attempted to release"
2643 " reservation from [%s]: %s with different TYPE "
2644 "and/or SCOPE while reservation already held by"
2645 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2646 cmd->se_tfo->get_fabric_name(),
2647 se_sess->se_node_acl->initiatorname,
2648 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2649 pr_res_holder->pr_reg_nacl->initiatorname);
2650
2651 spin_unlock(&dev->dev_reservation_lock);
2652 ret = TCM_RESERVATION_CONFLICT;
2653 goto out_put_pr_reg;
2654 }
2655 /*
2656 * In response to a persistent reservation release request from the
2657 * persistent reservation holder the device server shall perform a
2658 * release by doing the following as an uninterrupted series of actions:
2659 * a) Release the persistent reservation;
2660 * b) Not remove any registration(s);
2661 * c) If the released persistent reservation is a registrants only type
2662 * or all registrants type persistent reservation,
2663 * the device server shall establish a unit attention condition for
2664 * the initiator port associated with every regis-
2665 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2666 * RESERVE OUT command with RELEASE service action was received,
2667 * with the additional sense code set to RESERVATIONS RELEASED; and
2668 * d) If the persistent reservation is of any other type, the device
2669 * server shall not establish a unit attention condition.
2670 */
2671 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2672 pr_reg, 1);
2673
2674 spin_unlock(&dev->dev_reservation_lock);
2675
2676 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2677 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2678 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2679 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2680 /*
2681 * If no UNIT ATTENTION conditions will be established for
2682 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2683 * go ahead and check for APTPL=1 update+write below
2684 */
2685 goto write_aptpl;
2686 }
2687
2688 spin_lock(&pr_tmpl->registration_lock);
2689 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2690 pr_reg_list) {
2691 /*
2692 * Do not establish a UNIT ATTENTION condition
2693 * for the calling I_T Nexus
2694 */
2695 if (pr_reg_p == pr_reg)
2696 continue;
2697
2698 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2699 pr_reg_p->pr_res_mapped_lun,
2700 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2701 }
2702 spin_unlock(&pr_tmpl->registration_lock);
2703
2704 write_aptpl:
2705 if (pr_tmpl->pr_aptpl_active) {
2706 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2707 &pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) {
2708 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2709 }
2710 }
2711 out_put_pr_reg:
2712 core_scsi3_put_pr_reg(pr_reg);
2713 return ret;
2714 }
2715
2716 static sense_reason_t
2717 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2718 {
2719 struct se_device *dev = cmd->se_dev;
2720 struct se_node_acl *pr_reg_nacl;
2721 struct se_session *se_sess = cmd->se_sess;
2722 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2723 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2724 u32 pr_res_mapped_lun = 0;
2725 int calling_it_nexus = 0;
2726 /*
2727 * Locate the existing *pr_reg via struct se_node_acl pointers
2728 */
2729 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2730 se_sess->se_node_acl, se_sess);
2731 if (!pr_reg_n) {
2732 pr_err("SPC-3 PR: Unable to locate"
2733 " PR_REGISTERED *pr_reg for CLEAR\n");
2734 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2735 }
2736 /*
2737 * From spc4r17 section 5.7.11.6, Clearing:
2738 *
2739 * Any application client may release the persistent reservation and
2740 * remove all registrations from a device server by issuing a
2741 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2742 * registered I_T nexus with the following parameter:
2743 *
2744 * a) RESERVATION KEY field set to the value of the reservation key
2745 * that is registered with the logical unit for the I_T nexus.
2746 */
2747 if (res_key != pr_reg_n->pr_res_key) {
2748 pr_err("SPC-3 PR REGISTER: Received"
2749 " res_key: 0x%016Lx does not match"
2750 " existing SA REGISTER res_key:"
2751 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2752 core_scsi3_put_pr_reg(pr_reg_n);
2753 return TCM_RESERVATION_CONFLICT;
2754 }
2755 /*
2756 * a) Release the persistent reservation, if any;
2757 */
2758 spin_lock(&dev->dev_reservation_lock);
2759 pr_res_holder = dev->dev_pr_res_holder;
2760 if (pr_res_holder) {
2761 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2762 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2763 pr_res_holder, 0);
2764 }
2765 spin_unlock(&dev->dev_reservation_lock);
2766 /*
2767 * b) Remove all registration(s) (see spc4r17 5.7.7);
2768 */
2769 spin_lock(&pr_tmpl->registration_lock);
2770 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2771 &pr_tmpl->registration_list, pr_reg_list) {
2772
2773 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2774 pr_reg_nacl = pr_reg->pr_reg_nacl;
2775 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2776 __core_scsi3_free_registration(dev, pr_reg, NULL,
2777 calling_it_nexus);
2778 /*
2779 * e) Establish a unit attention condition for the initiator
2780 * port associated with every registered I_T nexus other
2781 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2782 * command with CLEAR service action was received, with the
2783 * additional sense code set to RESERVATIONS PREEMPTED.
2784 */
2785 if (!calling_it_nexus)
2786 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2787 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2788 }
2789 spin_unlock(&pr_tmpl->registration_lock);
2790
2791 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2792 cmd->se_tfo->get_fabric_name());
2793
2794 if (pr_tmpl->pr_aptpl_active) {
2795 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2796 pr_debug("SPC-3 PR: Updated APTPL metadata"
2797 " for CLEAR\n");
2798 }
2799
2800 core_scsi3_pr_generation(dev);
2801 return 0;
2802 }
2803
2804 /*
2805 * Called with struct se_device->dev_reservation_lock held.
2806 */
2807 static void __core_scsi3_complete_pro_preempt(
2808 struct se_device *dev,
2809 struct t10_pr_registration *pr_reg,
2810 struct list_head *preempt_and_abort_list,
2811 int type,
2812 int scope,
2813 int abort)
2814 {
2815 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2816 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2817 char i_buf[PR_REG_ISID_ID_LEN];
2818 int prf_isid;
2819
2820 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2821 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2822 PR_REG_ISID_ID_LEN);
2823 /*
2824 * Do an implict RELEASE of the existing reservation.
2825 */
2826 if (dev->dev_pr_res_holder)
2827 __core_scsi3_complete_pro_release(dev, nacl,
2828 dev->dev_pr_res_holder, 0);
2829
2830 dev->dev_pr_res_holder = pr_reg;
2831 pr_reg->pr_res_holder = 1;
2832 pr_reg->pr_res_type = type;
2833 pr_reg->pr_res_scope = scope;
2834
2835 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2836 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2837 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2838 core_scsi3_pr_dump_type(type),
2839 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2840 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2841 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2842 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2843 /*
2844 * For PREEMPT_AND_ABORT, add the preempting reservation's
2845 * struct t10_pr_registration to the list that will be compared
2846 * against received CDBs..
2847 */
2848 if (preempt_and_abort_list)
2849 list_add_tail(&pr_reg->pr_reg_abort_list,
2850 preempt_and_abort_list);
2851 }
2852
2853 static void core_scsi3_release_preempt_and_abort(
2854 struct list_head *preempt_and_abort_list,
2855 struct t10_pr_registration *pr_reg_holder)
2856 {
2857 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2858
2859 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2860 pr_reg_abort_list) {
2861
2862 list_del(&pr_reg->pr_reg_abort_list);
2863 if (pr_reg_holder == pr_reg)
2864 continue;
2865 if (pr_reg->pr_res_holder) {
2866 pr_warn("pr_reg->pr_res_holder still set\n");
2867 continue;
2868 }
2869
2870 pr_reg->pr_reg_deve = NULL;
2871 pr_reg->pr_reg_nacl = NULL;
2872 kfree(pr_reg->pr_aptpl_buf);
2873 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2874 }
2875 }
2876
2877 static sense_reason_t
2878 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2879 u64 sa_res_key, int abort)
2880 {
2881 struct se_device *dev = cmd->se_dev;
2882 struct se_node_acl *pr_reg_nacl;
2883 struct se_session *se_sess = cmd->se_sess;
2884 LIST_HEAD(preempt_and_abort_list);
2885 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2886 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2887 u32 pr_res_mapped_lun = 0;
2888 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2889 int prh_type = 0, prh_scope = 0;
2890
2891 if (!se_sess)
2892 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2893
2894 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2895 se_sess);
2896 if (!pr_reg_n) {
2897 pr_err("SPC-3 PR: Unable to locate"
2898 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2899 (abort) ? "_AND_ABORT" : "");
2900 return TCM_RESERVATION_CONFLICT;
2901 }
2902 if (pr_reg_n->pr_res_key != res_key) {
2903 core_scsi3_put_pr_reg(pr_reg_n);
2904 return TCM_RESERVATION_CONFLICT;
2905 }
2906 if (scope != PR_SCOPE_LU_SCOPE) {
2907 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2908 core_scsi3_put_pr_reg(pr_reg_n);
2909 return TCM_INVALID_PARAMETER_LIST;
2910 }
2911
2912 spin_lock(&dev->dev_reservation_lock);
2913 pr_res_holder = dev->dev_pr_res_holder;
2914 if (pr_res_holder &&
2915 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2916 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2917 all_reg = 1;
2918
2919 if (!all_reg && !sa_res_key) {
2920 spin_unlock(&dev->dev_reservation_lock);
2921 core_scsi3_put_pr_reg(pr_reg_n);
2922 return TCM_INVALID_PARAMETER_LIST;
2923 }
2924 /*
2925 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2926 *
2927 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2928 * persistent reservation holder or there is no persistent reservation
2929 * holder (i.e., there is no persistent reservation), then the device
2930 * server shall perform a preempt by doing the following in an
2931 * uninterrupted series of actions. (See below..)
2932 */
2933 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2934 /*
2935 * No existing or SA Reservation Key matching reservations..
2936 *
2937 * PROUT SA PREEMPT with All Registrant type reservations are
2938 * allowed to be processed without a matching SA Reservation Key
2939 */
2940 spin_lock(&pr_tmpl->registration_lock);
2941 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2942 &pr_tmpl->registration_list, pr_reg_list) {
2943 /*
2944 * Removing of registrations in non all registrants
2945 * type reservations without a matching SA reservation
2946 * key.
2947 *
2948 * a) Remove the registrations for all I_T nexuses
2949 * specified by the SERVICE ACTION RESERVATION KEY
2950 * field;
2951 * b) Ignore the contents of the SCOPE and TYPE fields;
2952 * c) Process tasks as defined in 5.7.1; and
2953 * d) Establish a unit attention condition for the
2954 * initiator port associated with every I_T nexus
2955 * that lost its registration other than the I_T
2956 * nexus on which the PERSISTENT RESERVE OUT command
2957 * was received, with the additional sense code set
2958 * to REGISTRATIONS PREEMPTED.
2959 */
2960 if (!all_reg) {
2961 if (pr_reg->pr_res_key != sa_res_key)
2962 continue;
2963
2964 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2965 pr_reg_nacl = pr_reg->pr_reg_nacl;
2966 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2967 __core_scsi3_free_registration(dev, pr_reg,
2968 (abort) ? &preempt_and_abort_list :
2969 NULL, calling_it_nexus);
2970 released_regs++;
2971 } else {
2972 /*
2973 * Case for any existing all registrants type
2974 * reservation, follow logic in spc4r17 section
2975 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2976 *
2977 * For a ZERO SA Reservation key, release
2978 * all other registrations and do an implict
2979 * release of active persistent reservation.
2980 *
2981 * For a non-ZERO SA Reservation key, only
2982 * release the matching reservation key from
2983 * registrations.
2984 */
2985 if ((sa_res_key) &&
2986 (pr_reg->pr_res_key != sa_res_key))
2987 continue;
2988
2989 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2990 if (calling_it_nexus)
2991 continue;
2992
2993 pr_reg_nacl = pr_reg->pr_reg_nacl;
2994 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2995 __core_scsi3_free_registration(dev, pr_reg,
2996 (abort) ? &preempt_and_abort_list :
2997 NULL, 0);
2998 released_regs++;
2999 }
3000 if (!calling_it_nexus)
3001 core_scsi3_ua_allocate(pr_reg_nacl,
3002 pr_res_mapped_lun, 0x2A,
3003 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3004 }
3005 spin_unlock(&pr_tmpl->registration_lock);
3006 /*
3007 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3008 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3009 * RESERVATION KEY field to a value that does not match any
3010 * registered reservation key, then the device server shall
3011 * complete the command with RESERVATION CONFLICT status.
3012 */
3013 if (!released_regs) {
3014 spin_unlock(&dev->dev_reservation_lock);
3015 core_scsi3_put_pr_reg(pr_reg_n);
3016 return TCM_RESERVATION_CONFLICT;
3017 }
3018 /*
3019 * For an existing all registrants type reservation
3020 * with a zero SA rservation key, preempt the existing
3021 * reservation with the new PR type and scope.
3022 */
3023 if (pr_res_holder && all_reg && !(sa_res_key)) {
3024 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3025 (abort) ? &preempt_and_abort_list : NULL,
3026 type, scope, abort);
3027
3028 if (abort)
3029 core_scsi3_release_preempt_and_abort(
3030 &preempt_and_abort_list, pr_reg_n);
3031 }
3032 spin_unlock(&dev->dev_reservation_lock);
3033
3034 if (pr_tmpl->pr_aptpl_active) {
3035 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3036 &pr_reg_n->pr_aptpl_buf[0],
3037 pr_tmpl->pr_aptpl_buf_len)) {
3038 pr_debug("SPC-3 PR: Updated APTPL"
3039 " metadata for PREEMPT%s\n", (abort) ?
3040 "_AND_ABORT" : "");
3041 }
3042 }
3043
3044 core_scsi3_put_pr_reg(pr_reg_n);
3045 core_scsi3_pr_generation(cmd->se_dev);
3046 return 0;
3047 }
3048 /*
3049 * The PREEMPTing SA reservation key matches that of the
3050 * existing persistent reservation, first, we check if
3051 * we are preempting our own reservation.
3052 * From spc4r17, section 5.7.11.4.3 Preempting
3053 * persistent reservations and registration handling
3054 *
3055 * If an all registrants persistent reservation is not
3056 * present, it is not an error for the persistent
3057 * reservation holder to preempt itself (i.e., a
3058 * PERSISTENT RESERVE OUT with a PREEMPT service action
3059 * or a PREEMPT AND ABORT service action with the
3060 * SERVICE ACTION RESERVATION KEY value equal to the
3061 * persistent reservation holder's reservation key that
3062 * is received from the persistent reservation holder).
3063 * In that case, the device server shall establish the
3064 * new persistent reservation and maintain the
3065 * registration.
3066 */
3067 prh_type = pr_res_holder->pr_res_type;
3068 prh_scope = pr_res_holder->pr_res_scope;
3069 /*
3070 * If the SERVICE ACTION RESERVATION KEY field identifies a
3071 * persistent reservation holder (see 5.7.10), the device
3072 * server shall perform a preempt by doing the following as
3073 * an uninterrupted series of actions:
3074 *
3075 * a) Release the persistent reservation for the holder
3076 * identified by the SERVICE ACTION RESERVATION KEY field;
3077 */
3078 if (pr_reg_n != pr_res_holder)
3079 __core_scsi3_complete_pro_release(dev,
3080 pr_res_holder->pr_reg_nacl,
3081 dev->dev_pr_res_holder, 0);
3082 /*
3083 * b) Remove the registrations for all I_T nexuses identified
3084 * by the SERVICE ACTION RESERVATION KEY field, except the
3085 * I_T nexus that is being used for the PERSISTENT RESERVE
3086 * OUT command. If an all registrants persistent reservation
3087 * is present and the SERVICE ACTION RESERVATION KEY field
3088 * is set to zero, then all registrations shall be removed
3089 * except for that of the I_T nexus that is being used for
3090 * the PERSISTENT RESERVE OUT command;
3091 */
3092 spin_lock(&pr_tmpl->registration_lock);
3093 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3094 &pr_tmpl->registration_list, pr_reg_list) {
3095
3096 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3097 if (calling_it_nexus)
3098 continue;
3099
3100 if (pr_reg->pr_res_key != sa_res_key)
3101 continue;
3102
3103 pr_reg_nacl = pr_reg->pr_reg_nacl;
3104 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3105 __core_scsi3_free_registration(dev, pr_reg,
3106 (abort) ? &preempt_and_abort_list : NULL,
3107 calling_it_nexus);
3108 /*
3109 * e) Establish a unit attention condition for the initiator
3110 * port associated with every I_T nexus that lost its
3111 * persistent reservation and/or registration, with the
3112 * additional sense code set to REGISTRATIONS PREEMPTED;
3113 */
3114 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3115 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3116 }
3117 spin_unlock(&pr_tmpl->registration_lock);
3118 /*
3119 * c) Establish a persistent reservation for the preempting
3120 * I_T nexus using the contents of the SCOPE and TYPE fields;
3121 */
3122 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3123 (abort) ? &preempt_and_abort_list : NULL,
3124 type, scope, abort);
3125 /*
3126 * d) Process tasks as defined in 5.7.1;
3127 * e) See above..
3128 * f) If the type or scope has changed, then for every I_T nexus
3129 * whose reservation key was not removed, except for the I_T
3130 * nexus on which the PERSISTENT RESERVE OUT command was
3131 * received, the device server shall establish a unit
3132 * attention condition for the initiator port associated with
3133 * that I_T nexus, with the additional sense code set to
3134 * RESERVATIONS RELEASED. If the type or scope have not
3135 * changed, then no unit attention condition(s) shall be
3136 * established for this reason.
3137 */
3138 if ((prh_type != type) || (prh_scope != scope)) {
3139 spin_lock(&pr_tmpl->registration_lock);
3140 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3141 &pr_tmpl->registration_list, pr_reg_list) {
3142
3143 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3144 if (calling_it_nexus)
3145 continue;
3146
3147 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3148 pr_reg->pr_res_mapped_lun, 0x2A,
3149 ASCQ_2AH_RESERVATIONS_RELEASED);
3150 }
3151 spin_unlock(&pr_tmpl->registration_lock);
3152 }
3153 spin_unlock(&dev->dev_reservation_lock);
3154 /*
3155 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3156 * All received CDBs for the matching existing reservation and
3157 * registrations undergo ABORT_TASK logic.
3158 *
3159 * From there, core_scsi3_release_preempt_and_abort() will
3160 * release every registration in the list (which have already
3161 * been removed from the primary pr_reg list), except the
3162 * new persistent reservation holder, the calling Initiator Port.
3163 */
3164 if (abort) {
3165 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3166 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3167 pr_reg_n);
3168 }
3169
3170 if (pr_tmpl->pr_aptpl_active) {
3171 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3172 &pr_reg_n->pr_aptpl_buf[0],
3173 pr_tmpl->pr_aptpl_buf_len)) {
3174 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3175 "%s\n", abort ? "_AND_ABORT" : "");
3176 }
3177 }
3178
3179 core_scsi3_put_pr_reg(pr_reg_n);
3180 core_scsi3_pr_generation(cmd->se_dev);
3181 return 0;
3182 }
3183
3184 static sense_reason_t
3185 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3186 u64 res_key, u64 sa_res_key, int abort)
3187 {
3188 switch (type) {
3189 case PR_TYPE_WRITE_EXCLUSIVE:
3190 case PR_TYPE_EXCLUSIVE_ACCESS:
3191 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3192 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3193 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3194 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3195 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3196 sa_res_key, abort);
3197 default:
3198 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3199 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3200 return TCM_INVALID_CDB_FIELD;
3201 }
3202 }
3203
3204
3205 static sense_reason_t
3206 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3207 u64 sa_res_key, int aptpl, int unreg)
3208 {
3209 struct se_session *se_sess = cmd->se_sess;
3210 struct se_device *dev = cmd->se_dev;
3211 struct se_dev_entry *dest_se_deve = NULL;
3212 struct se_lun *se_lun = cmd->se_lun;
3213 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3214 struct se_port *se_port;
3215 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3216 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3217 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3218 struct t10_reservation *pr_tmpl = &dev->t10_pr;
3219 unsigned char *buf;
3220 unsigned char *initiator_str;
3221 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3222 u32 tid_len, tmp_tid_len;
3223 int new_reg = 0, type, scope, matching_iname, prf_isid;
3224 sense_reason_t ret;
3225 unsigned short rtpi;
3226 unsigned char proto_ident;
3227
3228 if (!se_sess || !se_lun) {
3229 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3230 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3231 }
3232
3233 memset(dest_iport, 0, 64);
3234 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3235 se_tpg = se_sess->se_tpg;
3236 tf_ops = se_tpg->se_tpg_tfo;
3237 /*
3238 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3239 * Register behaviors for a REGISTER AND MOVE service action
3240 *
3241 * Locate the existing *pr_reg via struct se_node_acl pointers
3242 */
3243 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3244 se_sess);
3245 if (!pr_reg) {
3246 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3247 " *pr_reg for REGISTER_AND_MOVE\n");
3248 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3249 }
3250 /*
3251 * The provided reservation key much match the existing reservation key
3252 * provided during this initiator's I_T nexus registration.
3253 */
3254 if (res_key != pr_reg->pr_res_key) {
3255 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3256 " res_key: 0x%016Lx does not match existing SA REGISTER"
3257 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3258 ret = TCM_RESERVATION_CONFLICT;
3259 goto out_put_pr_reg;
3260 }
3261 /*
3262 * The service active reservation key needs to be non zero
3263 */
3264 if (!sa_res_key) {
3265 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3266 " sa_res_key\n");
3267 ret = TCM_INVALID_PARAMETER_LIST;
3268 goto out_put_pr_reg;
3269 }
3270
3271 /*
3272 * Determine the Relative Target Port Identifier where the reservation
3273 * will be moved to for the TransportID containing SCSI initiator WWN
3274 * information.
3275 */
3276 buf = transport_kmap_data_sg(cmd);
3277 if (!buf) {
3278 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3279 goto out_put_pr_reg;
3280 }
3281
3282 rtpi = (buf[18] & 0xff) << 8;
3283 rtpi |= buf[19] & 0xff;
3284 tid_len = (buf[20] & 0xff) << 24;
3285 tid_len |= (buf[21] & 0xff) << 16;
3286 tid_len |= (buf[22] & 0xff) << 8;
3287 tid_len |= buf[23] & 0xff;
3288 transport_kunmap_data_sg(cmd);
3289 buf = NULL;
3290
3291 if ((tid_len + 24) != cmd->data_length) {
3292 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3293 " does not equal CDB data_length: %u\n", tid_len,
3294 cmd->data_length);
3295 ret = TCM_INVALID_PARAMETER_LIST;
3296 goto out_put_pr_reg;
3297 }
3298
3299 spin_lock(&dev->se_port_lock);
3300 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3301 if (se_port->sep_rtpi != rtpi)
3302 continue;
3303 dest_se_tpg = se_port->sep_tpg;
3304 if (!dest_se_tpg)
3305 continue;
3306 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3307 if (!dest_tf_ops)
3308 continue;
3309
3310 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3311 smp_mb__after_atomic_inc();
3312 spin_unlock(&dev->se_port_lock);
3313
3314 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3315 pr_err("core_scsi3_tpg_depend_item() failed"
3316 " for dest_se_tpg\n");
3317 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3318 smp_mb__after_atomic_dec();
3319 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3320 goto out_put_pr_reg;
3321 }
3322
3323 spin_lock(&dev->se_port_lock);
3324 break;
3325 }
3326 spin_unlock(&dev->se_port_lock);
3327
3328 if (!dest_se_tpg || !dest_tf_ops) {
3329 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3330 " fabric ops from Relative Target Port Identifier:"
3331 " %hu\n", rtpi);
3332 ret = TCM_INVALID_PARAMETER_LIST;
3333 goto out_put_pr_reg;
3334 }
3335
3336 buf = transport_kmap_data_sg(cmd);
3337 if (!buf) {
3338 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3339 goto out_put_pr_reg;
3340 }
3341 proto_ident = (buf[24] & 0x0f);
3342
3343 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3344 " 0x%02x\n", proto_ident);
3345
3346 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3347 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3348 " proto_ident: 0x%02x does not match ident: 0x%02x"
3349 " from fabric: %s\n", proto_ident,
3350 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3351 dest_tf_ops->get_fabric_name());
3352 ret = TCM_INVALID_PARAMETER_LIST;
3353 goto out;
3354 }
3355 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3356 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3357 " containg a valid tpg_parse_pr_out_transport_id"
3358 " function pointer\n");
3359 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3360 goto out;
3361 }
3362 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3363 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3364 if (!initiator_str) {
3365 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3366 " initiator_str from Transport ID\n");
3367 ret = TCM_INVALID_PARAMETER_LIST;
3368 goto out;
3369 }
3370
3371 transport_kunmap_data_sg(cmd);
3372 buf = NULL;
3373
3374 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3375 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3376 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3377 iport_ptr : "");
3378 /*
3379 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3380 * action specifies a TransportID that is the same as the initiator port
3381 * of the I_T nexus for the command received, then the command shall
3382 * be terminated with CHECK CONDITION status, with the sense key set to
3383 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3384 * IN PARAMETER LIST.
3385 */
3386 pr_reg_nacl = pr_reg->pr_reg_nacl;
3387 matching_iname = (!strcmp(initiator_str,
3388 pr_reg_nacl->initiatorname)) ? 1 : 0;
3389 if (!matching_iname)
3390 goto after_iport_check;
3391
3392 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3393 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3394 " matches: %s on received I_T Nexus\n", initiator_str,
3395 pr_reg_nacl->initiatorname);
3396 ret = TCM_INVALID_PARAMETER_LIST;
3397 goto out;
3398 }
3399 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3400 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3401 " matches: %s %s on received I_T Nexus\n",
3402 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3403 pr_reg->pr_reg_isid);
3404 ret = TCM_INVALID_PARAMETER_LIST;
3405 goto out;
3406 }
3407 after_iport_check:
3408 /*
3409 * Locate the destination struct se_node_acl from the received Transport ID
3410 */
3411 spin_lock_irq(&dest_se_tpg->acl_node_lock);
3412 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3413 initiator_str);
3414 if (dest_node_acl) {
3415 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3416 smp_mb__after_atomic_inc();
3417 }
3418 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3419
3420 if (!dest_node_acl) {
3421 pr_err("Unable to locate %s dest_node_acl for"
3422 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3423 initiator_str);
3424 ret = TCM_INVALID_PARAMETER_LIST;
3425 goto out;
3426 }
3427
3428 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3429 pr_err("core_scsi3_nodeacl_depend_item() for"
3430 " dest_node_acl\n");
3431 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3432 smp_mb__after_atomic_dec();
3433 dest_node_acl = NULL;
3434 ret = TCM_INVALID_PARAMETER_LIST;
3435 goto out;
3436 }
3437
3438 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3439 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3440 dest_node_acl->initiatorname);
3441
3442 /*
3443 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3444 * PORT IDENTIFIER.
3445 */
3446 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3447 if (!dest_se_deve) {
3448 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3449 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3450 ret = TCM_INVALID_PARAMETER_LIST;
3451 goto out;
3452 }
3453
3454 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3455 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3456 atomic_dec(&dest_se_deve->pr_ref_count);
3457 smp_mb__after_atomic_dec();
3458 dest_se_deve = NULL;
3459 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3460 goto out;
3461 }
3462
3463 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3464 " ACL for dest_se_deve->mapped_lun: %u\n",
3465 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3466 dest_se_deve->mapped_lun);
3467
3468 /*
3469 * A persistent reservation needs to already existing in order to
3470 * successfully complete the REGISTER_AND_MOVE service action..
3471 */
3472 spin_lock(&dev->dev_reservation_lock);
3473 pr_res_holder = dev->dev_pr_res_holder;
3474 if (!pr_res_holder) {
3475 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3476 " currently held\n");
3477 spin_unlock(&dev->dev_reservation_lock);
3478 ret = TCM_INVALID_CDB_FIELD;
3479 goto out;
3480 }
3481 /*
3482 * The received on I_T Nexus must be the reservation holder.
3483 *
3484 * From spc4r17 section 5.7.8 Table 50 --
3485 * Register behaviors for a REGISTER AND MOVE service action
3486 */
3487 if (pr_res_holder != pr_reg) {
3488 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3489 " Nexus is not reservation holder\n");
3490 spin_unlock(&dev->dev_reservation_lock);
3491 ret = TCM_RESERVATION_CONFLICT;
3492 goto out;
3493 }
3494 /*
3495 * From spc4r17 section 5.7.8: registering and moving reservation
3496 *
3497 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3498 * action is received and the established persistent reservation is a
3499 * Write Exclusive - All Registrants type or Exclusive Access -
3500 * All Registrants type reservation, then the command shall be completed
3501 * with RESERVATION CONFLICT status.
3502 */
3503 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3504 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3505 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3506 " reservation for type: %s\n",
3507 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3508 spin_unlock(&dev->dev_reservation_lock);
3509 ret = TCM_RESERVATION_CONFLICT;
3510 goto out;
3511 }
3512 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3513 /*
3514 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3515 */
3516 type = pr_res_holder->pr_res_type;
3517 scope = pr_res_holder->pr_res_type;
3518 /*
3519 * c) Associate the reservation key specified in the SERVICE ACTION
3520 * RESERVATION KEY field with the I_T nexus specified as the
3521 * destination of the register and move, where:
3522 * A) The I_T nexus is specified by the TransportID and the
3523 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3524 * B) Regardless of the TransportID format used, the association for
3525 * the initiator port is based on either the initiator port name
3526 * (see 3.1.71) on SCSI transport protocols where port names are
3527 * required or the initiator port identifier (see 3.1.70) on SCSI
3528 * transport protocols where port names are not required;
3529 * d) Register the reservation key specified in the SERVICE ACTION
3530 * RESERVATION KEY field;
3531 * e) Retain the reservation key specified in the SERVICE ACTION
3532 * RESERVATION KEY field and associated information;
3533 *
3534 * Also, It is not an error for a REGISTER AND MOVE service action to
3535 * register an I_T nexus that is already registered with the same
3536 * reservation key or a different reservation key.
3537 */
3538 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3539 iport_ptr);
3540 if (!dest_pr_reg) {
3541 if (core_scsi3_alloc_registration(cmd->se_dev,
3542 dest_node_acl, dest_se_deve, iport_ptr,
3543 sa_res_key, 0, aptpl, 2, 1)) {
3544 spin_unlock(&dev->dev_reservation_lock);
3545 ret = TCM_INVALID_PARAMETER_LIST;
3546 goto out;
3547 }
3548 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3549 iport_ptr);
3550 new_reg = 1;
3551 }
3552 /*
3553 * f) Release the persistent reservation for the persistent reservation
3554 * holder (i.e., the I_T nexus on which the
3555 */
3556 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3557 dev->dev_pr_res_holder, 0);
3558 /*
3559 * g) Move the persistent reservation to the specified I_T nexus using
3560 * the same scope and type as the persistent reservation released in
3561 * item f); and
3562 */
3563 dev->dev_pr_res_holder = dest_pr_reg;
3564 dest_pr_reg->pr_res_holder = 1;
3565 dest_pr_reg->pr_res_type = type;
3566 pr_reg->pr_res_scope = scope;
3567 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3568 PR_REG_ISID_ID_LEN);
3569 /*
3570 * Increment PRGeneration for existing registrations..
3571 */
3572 if (!new_reg)
3573 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3574 spin_unlock(&dev->dev_reservation_lock);
3575
3576 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3577 " created new reservation holder TYPE: %s on object RTPI:"
3578 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3579 core_scsi3_pr_dump_type(type), rtpi,
3580 dest_pr_reg->pr_res_generation);
3581 pr_debug("SPC-3 PR Successfully moved reservation from"
3582 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3583 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3584 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3585 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3586 iport_ptr : "");
3587 /*
3588 * It is now safe to release configfs group dependencies for destination
3589 * of Transport ID Initiator Device/Port Identifier
3590 */
3591 core_scsi3_lunacl_undepend_item(dest_se_deve);
3592 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3593 core_scsi3_tpg_undepend_item(dest_se_tpg);
3594 /*
3595 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3596 * nexus on which PERSISTENT RESERVE OUT command was received.
3597 */
3598 if (unreg) {
3599 spin_lock(&pr_tmpl->registration_lock);
3600 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3601 spin_unlock(&pr_tmpl->registration_lock);
3602 } else
3603 core_scsi3_put_pr_reg(pr_reg);
3604
3605 /*
3606 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3607 * write out the updated metadata to struct file for this SCSI device.
3608 */
3609 if (!aptpl) {
3610 pr_tmpl->pr_aptpl_active = 0;
3611 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3612 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3613 " REGISTER_AND_MOVE\n");
3614 } else {
3615 pr_tmpl->pr_aptpl_active = 1;
3616 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3617 &dest_pr_reg->pr_aptpl_buf[0],
3618 pr_tmpl->pr_aptpl_buf_len)) {
3619 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3620 " REGISTER_AND_MOVE\n");
3621 }
3622 }
3623
3624 transport_kunmap_data_sg(cmd);
3625
3626 core_scsi3_put_pr_reg(dest_pr_reg);
3627 return 0;
3628 out:
3629 if (buf)
3630 transport_kunmap_data_sg(cmd);
3631 if (dest_se_deve)
3632 core_scsi3_lunacl_undepend_item(dest_se_deve);
3633 if (dest_node_acl)
3634 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3635 core_scsi3_tpg_undepend_item(dest_se_tpg);
3636
3637 out_put_pr_reg:
3638 core_scsi3_put_pr_reg(pr_reg);
3639 return ret;
3640 }
3641
3642 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3643 {
3644 unsigned int __v1, __v2;
3645
3646 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3647 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3648
3649 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3650 }
3651
3652 /*
3653 * See spc4r17 section 6.14 Table 170
3654 */
3655 sense_reason_t
3656 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3657 {
3658 unsigned char *cdb = &cmd->t_task_cdb[0];
3659 unsigned char *buf;
3660 u64 res_key, sa_res_key;
3661 int sa, scope, type, aptpl;
3662 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3663 sense_reason_t ret;
3664
3665 /*
3666 * Following spc2r20 5.5.1 Reservations overview:
3667 *
3668 * If a logical unit has been reserved by any RESERVE command and is
3669 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3670 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3671 * initiator or service action and shall terminate with a RESERVATION
3672 * CONFLICT status.
3673 */
3674 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3675 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3676 " SPC-2 reservation is held, returning"
3677 " RESERVATION_CONFLICT\n");
3678 return TCM_RESERVATION_CONFLICT;
3679 }
3680
3681 /*
3682 * FIXME: A NULL struct se_session pointer means an this is not coming from
3683 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3684 */
3685 if (!cmd->se_sess)
3686 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3687
3688 if (cmd->data_length < 24) {
3689 pr_warn("SPC-PR: Received PR OUT parameter list"
3690 " length too small: %u\n", cmd->data_length);
3691 return TCM_INVALID_PARAMETER_LIST;
3692 }
3693
3694 /*
3695 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3696 */
3697 sa = (cdb[1] & 0x1f);
3698 scope = (cdb[2] & 0xf0);
3699 type = (cdb[2] & 0x0f);
3700
3701 buf = transport_kmap_data_sg(cmd);
3702 if (!buf)
3703 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3704
3705 /*
3706 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3707 */
3708 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3709 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3710 /*
3711 * REGISTER_AND_MOVE uses a different SA parameter list containing
3712 * SCSI TransportIDs.
3713 */
3714 if (sa != PRO_REGISTER_AND_MOVE) {
3715 spec_i_pt = (buf[20] & 0x08);
3716 all_tg_pt = (buf[20] & 0x04);
3717 aptpl = (buf[20] & 0x01);
3718 } else {
3719 aptpl = (buf[17] & 0x01);
3720 unreg = (buf[17] & 0x02);
3721 }
3722 transport_kunmap_data_sg(cmd);
3723 buf = NULL;
3724
3725 /*
3726 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3727 */
3728 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3729 return TCM_INVALID_PARAMETER_LIST;
3730
3731 /*
3732 * From spc4r17 section 6.14:
3733 *
3734 * If the SPEC_I_PT bit is set to zero, the service action is not
3735 * REGISTER AND MOVE, and the parameter list length is not 24, then
3736 * the command shall be terminated with CHECK CONDITION status, with
3737 * the sense key set to ILLEGAL REQUEST, and the additional sense
3738 * code set to PARAMETER LIST LENGTH ERROR.
3739 */
3740 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3741 (cmd->data_length != 24)) {
3742 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3743 " list length: %u\n", cmd->data_length);
3744 return TCM_INVALID_PARAMETER_LIST;
3745 }
3746
3747 /*
3748 * (core_scsi3_emulate_pro_* function parameters
3749 * are defined by spc4r17 Table 174:
3750 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3751 */
3752 switch (sa) {
3753 case PRO_REGISTER:
3754 ret = core_scsi3_emulate_pro_register(cmd,
3755 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3756 break;
3757 case PRO_RESERVE:
3758 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3759 break;
3760 case PRO_RELEASE:
3761 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3762 break;
3763 case PRO_CLEAR:
3764 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3765 break;
3766 case PRO_PREEMPT:
3767 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3768 res_key, sa_res_key, 0);
3769 break;
3770 case PRO_PREEMPT_AND_ABORT:
3771 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3772 res_key, sa_res_key, 1);
3773 break;
3774 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3775 ret = core_scsi3_emulate_pro_register(cmd,
3776 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3777 break;
3778 case PRO_REGISTER_AND_MOVE:
3779 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3780 sa_res_key, aptpl, unreg);
3781 break;
3782 default:
3783 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3784 " action: 0x%02x\n", cdb[1] & 0x1f);
3785 return TCM_INVALID_CDB_FIELD;
3786 }
3787
3788 if (!ret)
3789 target_complete_cmd(cmd, GOOD);
3790 return ret;
3791 }
3792
3793 /*
3794 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3795 *
3796 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3797 */
3798 static sense_reason_t
3799 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3800 {
3801 struct se_device *dev = cmd->se_dev;
3802 struct t10_pr_registration *pr_reg;
3803 unsigned char *buf;
3804 u32 add_len = 0, off = 8;
3805
3806 if (cmd->data_length < 8) {
3807 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3808 " too small\n", cmd->data_length);
3809 return TCM_INVALID_CDB_FIELD;
3810 }
3811
3812 buf = transport_kmap_data_sg(cmd);
3813 if (!buf)
3814 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3815
3816 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3817 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3818 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3819 buf[3] = (dev->t10_pr.pr_generation & 0xff);
3820
3821 spin_lock(&dev->t10_pr.registration_lock);
3822 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3823 pr_reg_list) {
3824 /*
3825 * Check for overflow of 8byte PRI READ_KEYS payload and
3826 * next reservation key list descriptor.
3827 */
3828 if ((add_len + 8) > (cmd->data_length - 8))
3829 break;
3830
3831 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3832 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3833 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3834 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3835 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3836 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3837 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3838 buf[off++] = (pr_reg->pr_res_key & 0xff);
3839
3840 add_len += 8;
3841 }
3842 spin_unlock(&dev->t10_pr.registration_lock);
3843
3844 buf[4] = ((add_len >> 24) & 0xff);
3845 buf[5] = ((add_len >> 16) & 0xff);
3846 buf[6] = ((add_len >> 8) & 0xff);
3847 buf[7] = (add_len & 0xff);
3848
3849 transport_kunmap_data_sg(cmd);
3850
3851 return 0;
3852 }
3853
3854 /*
3855 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3856 *
3857 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3858 */
3859 static sense_reason_t
3860 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3861 {
3862 struct se_device *dev = cmd->se_dev;
3863 struct t10_pr_registration *pr_reg;
3864 unsigned char *buf;
3865 u64 pr_res_key;
3866 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3867
3868 if (cmd->data_length < 8) {
3869 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3870 " too small\n", cmd->data_length);
3871 return TCM_INVALID_CDB_FIELD;
3872 }
3873
3874 buf = transport_kmap_data_sg(cmd);
3875 if (!buf)
3876 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3877
3878 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3879 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3880 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3881 buf[3] = (dev->t10_pr.pr_generation & 0xff);
3882
3883 spin_lock(&dev->dev_reservation_lock);
3884 pr_reg = dev->dev_pr_res_holder;
3885 if (pr_reg) {
3886 /*
3887 * Set the hardcoded Additional Length
3888 */
3889 buf[4] = ((add_len >> 24) & 0xff);
3890 buf[5] = ((add_len >> 16) & 0xff);
3891 buf[6] = ((add_len >> 8) & 0xff);
3892 buf[7] = (add_len & 0xff);
3893
3894 if (cmd->data_length < 22)
3895 goto err;
3896
3897 /*
3898 * Set the Reservation key.
3899 *
3900 * From spc4r17, section 5.7.10:
3901 * A persistent reservation holder has its reservation key
3902 * returned in the parameter data from a PERSISTENT
3903 * RESERVE IN command with READ RESERVATION service action as
3904 * follows:
3905 * a) For a persistent reservation of the type Write Exclusive
3906 * - All Registrants or Exclusive Access ­ All Regitrants,
3907 * the reservation key shall be set to zero; or
3908 * b) For all other persistent reservation types, the
3909 * reservation key shall be set to the registered
3910 * reservation key for the I_T nexus that holds the
3911 * persistent reservation.
3912 */
3913 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3914 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3915 pr_res_key = 0;
3916 else
3917 pr_res_key = pr_reg->pr_res_key;
3918
3919 buf[8] = ((pr_res_key >> 56) & 0xff);
3920 buf[9] = ((pr_res_key >> 48) & 0xff);
3921 buf[10] = ((pr_res_key >> 40) & 0xff);
3922 buf[11] = ((pr_res_key >> 32) & 0xff);
3923 buf[12] = ((pr_res_key >> 24) & 0xff);
3924 buf[13] = ((pr_res_key >> 16) & 0xff);
3925 buf[14] = ((pr_res_key >> 8) & 0xff);
3926 buf[15] = (pr_res_key & 0xff);
3927 /*
3928 * Set the SCOPE and TYPE
3929 */
3930 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3931 (pr_reg->pr_res_type & 0x0f);
3932 }
3933
3934 err:
3935 spin_unlock(&dev->dev_reservation_lock);
3936 transport_kunmap_data_sg(cmd);
3937
3938 return 0;
3939 }
3940
3941 /*
3942 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3943 *
3944 * See spc4r17 section 6.13.4 Table 165
3945 */
3946 static sense_reason_t
3947 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3948 {
3949 struct se_device *dev = cmd->se_dev;
3950 struct t10_reservation *pr_tmpl = &dev->t10_pr;
3951 unsigned char *buf;
3952 u16 add_len = 8; /* Hardcoded to 8. */
3953
3954 if (cmd->data_length < 6) {
3955 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3956 " %u too small\n", cmd->data_length);
3957 return TCM_INVALID_CDB_FIELD;
3958 }
3959
3960 buf = transport_kmap_data_sg(cmd);
3961 if (!buf)
3962 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3963
3964 buf[0] = ((add_len << 8) & 0xff);
3965 buf[1] = (add_len & 0xff);
3966 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3967 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3968 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3969 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3970 /*
3971 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3972 * set the TMV: Task Mask Valid bit.
3973 */
3974 buf[3] |= 0x80;
3975 /*
3976 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3977 */
3978 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3979 /*
3980 * PTPL_A: Persistence across Target Power Loss Active bit
3981 */
3982 if (pr_tmpl->pr_aptpl_active)
3983 buf[3] |= 0x01;
3984 /*
3985 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3986 */
3987 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3988 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3989 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3990 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3991 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3992 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3993
3994 transport_kunmap_data_sg(cmd);
3995
3996 return 0;
3997 }
3998
3999 /*
4000 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4001 *
4002 * See spc4r17 section 6.13.5 Table 168 and 169
4003 */
4004 static sense_reason_t
4005 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4006 {
4007 struct se_device *dev = cmd->se_dev;
4008 struct se_node_acl *se_nacl;
4009 struct se_portal_group *se_tpg;
4010 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4011 struct t10_reservation *pr_tmpl = &dev->t10_pr;
4012 unsigned char *buf;
4013 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4014 u32 off = 8; /* off into first Full Status descriptor */
4015 int format_code = 0;
4016
4017 if (cmd->data_length < 8) {
4018 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4019 " too small\n", cmd->data_length);
4020 return TCM_INVALID_CDB_FIELD;
4021 }
4022
4023 buf = transport_kmap_data_sg(cmd);
4024 if (!buf)
4025 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4026
4027 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
4028 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
4029 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
4030 buf[3] = (dev->t10_pr.pr_generation & 0xff);
4031
4032 spin_lock(&pr_tmpl->registration_lock);
4033 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4034 &pr_tmpl->registration_list, pr_reg_list) {
4035
4036 se_nacl = pr_reg->pr_reg_nacl;
4037 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4038 add_desc_len = 0;
4039
4040 atomic_inc(&pr_reg->pr_res_holders);
4041 smp_mb__after_atomic_inc();
4042 spin_unlock(&pr_tmpl->registration_lock);
4043 /*
4044 * Determine expected length of $FABRIC_MOD specific
4045 * TransportID full status descriptor..
4046 */
4047 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4048 se_tpg, se_nacl, pr_reg, &format_code);
4049
4050 if ((exp_desc_len + add_len) > cmd->data_length) {
4051 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4052 " out of buffer: %d\n", cmd->data_length);
4053 spin_lock(&pr_tmpl->registration_lock);
4054 atomic_dec(&pr_reg->pr_res_holders);
4055 smp_mb__after_atomic_dec();
4056 break;
4057 }
4058 /*
4059 * Set RESERVATION KEY
4060 */
4061 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4062 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4063 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4064 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4065 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4066 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4067 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4068 buf[off++] = (pr_reg->pr_res_key & 0xff);
4069 off += 4; /* Skip Over Reserved area */
4070
4071 /*
4072 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4073 */
4074 if (pr_reg->pr_reg_all_tg_pt)
4075 buf[off] = 0x02;
4076 /*
4077 * The struct se_lun pointer will be present for the
4078 * reservation holder for PR_HOLDER bit.
4079 *
4080 * Also, if this registration is the reservation
4081 * holder, fill in SCOPE and TYPE in the next byte.
4082 */
4083 if (pr_reg->pr_res_holder) {
4084 buf[off++] |= 0x01;
4085 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4086 (pr_reg->pr_res_type & 0x0f);
4087 } else
4088 off += 2;
4089
4090 off += 4; /* Skip over reserved area */
4091 /*
4092 * From spc4r17 6.3.15:
4093 *
4094 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4095 * IDENTIFIER field contains the relative port identifier (see
4096 * 3.1.120) of the target port that is part of the I_T nexus
4097 * described by this full status descriptor. If the ALL_TG_PT
4098 * bit is set to one, the contents of the RELATIVE TARGET PORT
4099 * IDENTIFIER field are not defined by this standard.
4100 */
4101 if (!pr_reg->pr_reg_all_tg_pt) {
4102 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4103
4104 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4105 buf[off++] = (port->sep_rtpi & 0xff);
4106 } else
4107 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4108
4109 /*
4110 * Now, have the $FABRIC_MOD fill in the protocol identifier
4111 */
4112 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4113 se_nacl, pr_reg, &format_code, &buf[off+4]);
4114
4115 spin_lock(&pr_tmpl->registration_lock);
4116 atomic_dec(&pr_reg->pr_res_holders);
4117 smp_mb__after_atomic_dec();
4118 /*
4119 * Set the ADDITIONAL DESCRIPTOR LENGTH
4120 */
4121 buf[off++] = ((desc_len >> 24) & 0xff);
4122 buf[off++] = ((desc_len >> 16) & 0xff);
4123 buf[off++] = ((desc_len >> 8) & 0xff);
4124 buf[off++] = (desc_len & 0xff);
4125 /*
4126 * Size of full desctipor header minus TransportID
4127 * containing $FABRIC_MOD specific) initiator device/port
4128 * WWN information.
4129 *
4130 * See spc4r17 Section 6.13.5 Table 169
4131 */
4132 add_desc_len = (24 + desc_len);
4133
4134 off += desc_len;
4135 add_len += add_desc_len;
4136 }
4137 spin_unlock(&pr_tmpl->registration_lock);
4138 /*
4139 * Set ADDITIONAL_LENGTH
4140 */
4141 buf[4] = ((add_len >> 24) & 0xff);
4142 buf[5] = ((add_len >> 16) & 0xff);
4143 buf[6] = ((add_len >> 8) & 0xff);
4144 buf[7] = (add_len & 0xff);
4145
4146 transport_kunmap_data_sg(cmd);
4147
4148 return 0;
4149 }
4150
4151 sense_reason_t
4152 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4153 {
4154 sense_reason_t ret;
4155
4156 /*
4157 * Following spc2r20 5.5.1 Reservations overview:
4158 *
4159 * If a logical unit has been reserved by any RESERVE command and is
4160 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4161 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4162 * initiator or service action and shall terminate with a RESERVATION
4163 * CONFLICT status.
4164 */
4165 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4166 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4167 " SPC-2 reservation is held, returning"
4168 " RESERVATION_CONFLICT\n");
4169 return TCM_RESERVATION_CONFLICT;
4170 }
4171
4172 switch (cmd->t_task_cdb[1] & 0x1f) {
4173 case PRI_READ_KEYS:
4174 ret = core_scsi3_pri_read_keys(cmd);
4175 break;
4176 case PRI_READ_RESERVATION:
4177 ret = core_scsi3_pri_read_reservation(cmd);
4178 break;
4179 case PRI_REPORT_CAPABILITIES:
4180 ret = core_scsi3_pri_report_capabilities(cmd);
4181 break;
4182 case PRI_READ_FULL_STATUS:
4183 ret = core_scsi3_pri_read_full_status(cmd);
4184 break;
4185 default:
4186 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4187 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4188 return TCM_INVALID_CDB_FIELD;
4189 }
4190
4191 if (!ret)
4192 target_complete_cmd(cmd, GOOD);
4193 return ret;
4194 }
4195
4196 sense_reason_t
4197 target_check_reservation(struct se_cmd *cmd)
4198 {
4199 struct se_device *dev = cmd->se_dev;
4200 sense_reason_t ret;
4201
4202 if (!cmd->se_sess)
4203 return 0;
4204 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4205 return 0;
4206 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4207 return 0;
4208
4209 spin_lock(&dev->dev_reservation_lock);
4210 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4211 ret = target_scsi2_reservation_check(cmd);
4212 else
4213 ret = target_scsi3_pr_reservation_check(cmd);
4214 spin_unlock(&dev->dev_reservation_lock);
4215
4216 return ret;
4217 }
Linux 2.6 libata-dev (mirror)