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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / drivers / target / target_core_pr.c
blob98e12d31c9c23f67e89bc1266e93fffb21138f56
1 /*******************************************************************************
2 * Filename: target_core_pr.c
3 *
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
6 *
7 * Copyright (c) 2009, 2010 Rising Tide Systems
8 * Copyright (c) 2009, 2010 Linux-iSCSI.org
9 *
10 * Nicholas A. Bellinger <nab@kernel.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 *
26 ******************************************************************************/
27
28 #include <linux/version.h>
29 #include <linux/slab.h>
30 #include <linux/spinlock.h>
31 #include <linux/list.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <asm/unaligned.h>
35
36 #include <target/target_core_base.h>
37 #include <target/target_core_device.h>
38 #include <target/target_core_tmr.h>
39 #include <target/target_core_tpg.h>
40 #include <target/target_core_transport.h>
41 #include <target/target_core_fabric_ops.h>
42 #include <target/target_core_configfs.h>
43
44 #include "target_core_hba.h"
45 #include "target_core_pr.h"
46 #include "target_core_ua.h"
47
48 /*
49 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
50 */
51 struct pr_transport_id_holder {
52 int dest_local_nexus;
53 struct t10_pr_registration *dest_pr_reg;
54 struct se_portal_group *dest_tpg;
55 struct se_node_acl *dest_node_acl;
56 struct se_dev_entry *dest_se_deve;
57 struct list_head dest_list;
58 };
59
60 int core_pr_dump_initiator_port(
61 struct t10_pr_registration *pr_reg,
62 char *buf,
63 u32 size)
64 {
65 if (!(pr_reg->isid_present_at_reg))
66 return 0;
67
68 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
69 return 1;
70 }
71
72 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
73 struct t10_pr_registration *, int);
74
75 static int core_scsi2_reservation_seq_non_holder(
76 struct se_cmd *cmd,
77 unsigned char *cdb,
78 u32 pr_reg_type)
79 {
80 switch (cdb[0]) {
81 case INQUIRY:
82 case RELEASE:
83 case RELEASE_10:
84 return 0;
85 default:
86 return 1;
87 }
88
89 return 1;
90 }
91
92 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
93 {
94 struct se_device *dev = cmd->se_dev;
95 struct se_session *sess = cmd->se_sess;
96 int ret;
97
98 if (!(sess))
99 return 0;
100
101 spin_lock(&dev->dev_reservation_lock);
102 if (!dev->dev_reserved_node_acl || !sess) {
103 spin_unlock(&dev->dev_reservation_lock);
104 return 0;
105 }
106 if (dev->dev_reserved_node_acl != sess->se_node_acl) {
107 spin_unlock(&dev->dev_reservation_lock);
108 return -1;
109 }
110 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
111 spin_unlock(&dev->dev_reservation_lock);
112 return 0;
113 }
114 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -1;
115 spin_unlock(&dev->dev_reservation_lock);
116
117 return ret;
118 }
119
120 static int core_scsi2_reservation_release(struct se_cmd *cmd)
121 {
122 struct se_device *dev = cmd->se_dev;
123 struct se_session *sess = cmd->se_sess;
124 struct se_portal_group *tpg = sess->se_tpg;
125
126 if (!(sess) || !(tpg))
127 return 0;
128
129 spin_lock(&dev->dev_reservation_lock);
130 if (!dev->dev_reserved_node_acl || !sess) {
131 spin_unlock(&dev->dev_reservation_lock);
132 return 0;
133 }
134
135 if (dev->dev_reserved_node_acl != sess->se_node_acl) {
136 spin_unlock(&dev->dev_reservation_lock);
137 return 0;
138 }
139 dev->dev_reserved_node_acl = NULL;
140 dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
141 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
142 dev->dev_res_bin_isid = 0;
143 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
144 }
145 printk(KERN_INFO "SCSI-2 Released reservation for %s LUN: %u ->"
146 " MAPPED LUN: %u for %s\n", TPG_TFO(tpg)->get_fabric_name(),
147 SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun,
148 sess->se_node_acl->initiatorname);
149 spin_unlock(&dev->dev_reservation_lock);
150
151 return 0;
152 }
153
154 static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
155 {
156 struct se_device *dev = cmd->se_dev;
157 struct se_session *sess = cmd->se_sess;
158 struct se_portal_group *tpg = sess->se_tpg;
159
160 if ((T_TASK(cmd)->t_task_cdb[1] & 0x01) &&
161 (T_TASK(cmd)->t_task_cdb[1] & 0x02)) {
162 printk(KERN_ERR "LongIO and Obselete Bits set, returning"
163 " ILLEGAL_REQUEST\n");
164 return PYX_TRANSPORT_ILLEGAL_REQUEST;
165 }
166 /*
167 * This is currently the case for target_core_mod passthrough struct se_cmd
168 * ops
169 */
170 if (!(sess) || !(tpg))
171 return 0;
172
173 spin_lock(&dev->dev_reservation_lock);
174 if (dev->dev_reserved_node_acl &&
175 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
176 printk(KERN_ERR "SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
177 TPG_TFO(tpg)->get_fabric_name());
178 printk(KERN_ERR "Original reserver LUN: %u %s\n",
179 SE_LUN(cmd)->unpacked_lun,
180 dev->dev_reserved_node_acl->initiatorname);
181 printk(KERN_ERR "Current attempt - LUN: %u -> MAPPED LUN: %u"
182 " from %s \n", SE_LUN(cmd)->unpacked_lun,
183 cmd->se_deve->mapped_lun,
184 sess->se_node_acl->initiatorname);
185 spin_unlock(&dev->dev_reservation_lock);
186 return PYX_TRANSPORT_RESERVATION_CONFLICT;
187 }
188
189 dev->dev_reserved_node_acl = sess->se_node_acl;
190 dev->dev_flags |= DF_SPC2_RESERVATIONS;
191 if (sess->sess_bin_isid != 0) {
192 dev->dev_res_bin_isid = sess->sess_bin_isid;
193 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
194 }
195 printk(KERN_INFO "SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
196 " for %s\n", TPG_TFO(tpg)->get_fabric_name(),
197 SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun,
198 sess->se_node_acl->initiatorname);
199 spin_unlock(&dev->dev_reservation_lock);
200
201 return 0;
202 }
203
204 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
205 struct se_node_acl *, struct se_session *);
206 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
207
208 /*
209 * Setup in target_core_transport.c:transport_generic_cmd_sequencer()
210 * and called via struct se_cmd->transport_emulate_cdb() in TCM processing
211 * thread context.
212 */
213 int core_scsi2_emulate_crh(struct se_cmd *cmd)
214 {
215 struct se_session *se_sess = cmd->se_sess;
216 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
217 struct t10_pr_registration *pr_reg;
218 struct t10_reservation_template *pr_tmpl = &su_dev->t10_reservation;
219 unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0];
220 int crh = (T10_RES(su_dev)->res_type == SPC3_PERSISTENT_RESERVATIONS);
221 int conflict = 0;
222
223 if (!(se_sess))
224 return 0;
225
226 if (!(crh))
227 goto after_crh;
228
229 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
230 se_sess);
231 if (pr_reg) {
232 /*
233 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
234 * behavior
235 *
236 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
237 * status, but no reservation shall be established and the
238 * persistent reservation shall not be changed, if the command
239 * is received from a) and b) below.
240 *
241 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
242 * status, but the persistent reservation shall not be released,
243 * if the command is received from a) and b)
244 *
245 * a) An I_T nexus that is a persistent reservation holder; or
246 * b) An I_T nexus that is registered if a registrants only or
247 * all registrants type persistent reservation is present.
248 *
249 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
250 * RELEASE(6) command, or RELEASE(10) command shall be processed
251 * as defined in SPC-2.
252 */
253 if (pr_reg->pr_res_holder) {
254 core_scsi3_put_pr_reg(pr_reg);
255 return 0;
256 }
257 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
258 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
259 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
260 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
261 core_scsi3_put_pr_reg(pr_reg);
262 return 0;
263 }
264 core_scsi3_put_pr_reg(pr_reg);
265 conflict = 1;
266 } else {
267 /*
268 * Following spc2r20 5.5.1 Reservations overview:
269 *
270 * If a logical unit has executed a PERSISTENT RESERVE OUT
271 * command with the REGISTER or the REGISTER AND IGNORE
272 * EXISTING KEY service action and is still registered by any
273 * initiator, all RESERVE commands and all RELEASE commands
274 * regardless of initiator shall conflict and shall terminate
275 * with a RESERVATION CONFLICT status.
276 */
277 spin_lock(&pr_tmpl->registration_lock);
278 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
279 spin_unlock(&pr_tmpl->registration_lock);
280 }
281
282 if (conflict) {
283 printk(KERN_ERR "Received legacy SPC-2 RESERVE/RELEASE"
284 " while active SPC-3 registrations exist,"
285 " returning RESERVATION_CONFLICT\n");
286 return PYX_TRANSPORT_RESERVATION_CONFLICT;
287 }
288
289 after_crh:
290 if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10))
291 return core_scsi2_reservation_reserve(cmd);
292 else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10))
293 return core_scsi2_reservation_release(cmd);
294 else
295 return PYX_TRANSPORT_INVALID_CDB_FIELD;
296 }
297
298 /*
299 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
300 *
301 * This function is called by those initiator ports who are *NOT*
302 * the active PR reservation holder when a reservation is present.
303 */
304 static int core_scsi3_pr_seq_non_holder(
305 struct se_cmd *cmd,
306 unsigned char *cdb,
307 u32 pr_reg_type)
308 {
309 struct se_dev_entry *se_deve;
310 struct se_session *se_sess = SE_SESS(cmd);
311 int other_cdb = 0, ignore_reg;
312 int registered_nexus = 0, ret = 1; /* Conflict by default */
313 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
314 int we = 0; /* Write Exclusive */
315 int legacy = 0; /* Act like a legacy device and return
316 * RESERVATION CONFLICT on some CDBs */
317 /*
318 * A legacy SPC-2 reservation is being held.
319 */
320 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
321 return core_scsi2_reservation_seq_non_holder(cmd,
322 cdb, pr_reg_type);
323
324 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
325 /*
326 * Determine if the registration should be ignored due to
327 * non-matching ISIDs in core_scsi3_pr_reservation_check().
328 */
329 ignore_reg = (pr_reg_type & 0x80000000);
330 if (ignore_reg)
331 pr_reg_type &= ~0x80000000;
332
333 switch (pr_reg_type) {
334 case PR_TYPE_WRITE_EXCLUSIVE:
335 we = 1;
336 case PR_TYPE_EXCLUSIVE_ACCESS:
337 /*
338 * Some commands are only allowed for the persistent reservation
339 * holder.
340 */
341 if ((se_deve->def_pr_registered) && !(ignore_reg))
342 registered_nexus = 1;
343 break;
344 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
345 we = 1;
346 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
347 /*
348 * Some commands are only allowed for registered I_T Nexuses.
349 */
350 reg_only = 1;
351 if ((se_deve->def_pr_registered) && !(ignore_reg))
352 registered_nexus = 1;
353 break;
354 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
355 we = 1;
356 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
357 /*
358 * Each registered I_T Nexus is a reservation holder.
359 */
360 all_reg = 1;
361 if ((se_deve->def_pr_registered) && !(ignore_reg))
362 registered_nexus = 1;
363 break;
364 default:
365 return -1;
366 }
367 /*
368 * Referenced from spc4r17 table 45 for *NON* PR holder access
369 */
370 switch (cdb[0]) {
371 case SECURITY_PROTOCOL_IN:
372 if (registered_nexus)
373 return 0;
374 ret = (we) ? 0 : 1;
375 break;
376 case MODE_SENSE:
377 case MODE_SENSE_10:
378 case READ_ATTRIBUTE:
379 case READ_BUFFER:
380 case RECEIVE_DIAGNOSTIC:
381 if (legacy) {
382 ret = 1;
383 break;
384 }
385 if (registered_nexus) {
386 ret = 0;
387 break;
388 }
389 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
390 break;
391 case PERSISTENT_RESERVE_OUT:
392 /*
393 * This follows PERSISTENT_RESERVE_OUT service actions that
394 * are allowed in the presence of various reservations.
395 * See spc4r17, table 46
396 */
397 switch (cdb[1] & 0x1f) {
398 case PRO_CLEAR:
399 case PRO_PREEMPT:
400 case PRO_PREEMPT_AND_ABORT:
401 ret = (registered_nexus) ? 0 : 1;
402 break;
403 case PRO_REGISTER:
404 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
405 ret = 0;
406 break;
407 case PRO_REGISTER_AND_MOVE:
408 case PRO_RESERVE:
409 ret = 1;
410 break;
411 case PRO_RELEASE:
412 ret = (registered_nexus) ? 0 : 1;
413 break;
414 default:
415 printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service"
416 " action: 0x%02x\n", cdb[1] & 0x1f);
417 return -1;
418 }
419 break;
420 case RELEASE:
421 case RELEASE_10:
422 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
423 ret = 0;
424 break;
425 case RESERVE:
426 case RESERVE_10:
427 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
428 ret = 0;
429 break;
430 case TEST_UNIT_READY:
431 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
432 break;
433 case MAINTENANCE_IN:
434 switch (cdb[1] & 0x1f) {
435 case MI_MANAGEMENT_PROTOCOL_IN:
436 if (registered_nexus) {
437 ret = 0;
438 break;
439 }
440 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
441 break;
442 case MI_REPORT_SUPPORTED_OPERATION_CODES:
443 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
444 if (legacy) {
445 ret = 1;
446 break;
447 }
448 if (registered_nexus) {
449 ret = 0;
450 break;
451 }
452 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
453 break;
454 case MI_REPORT_ALIASES:
455 case MI_REPORT_IDENTIFYING_INFORMATION:
456 case MI_REPORT_PRIORITY:
457 case MI_REPORT_TARGET_PGS:
458 case MI_REPORT_TIMESTAMP:
459 ret = 0; /* Allowed */
460 break;
461 default:
462 printk(KERN_ERR "Unknown MI Service Action: 0x%02x\n",
463 (cdb[1] & 0x1f));
464 return -1;
465 }
466 break;
467 case ACCESS_CONTROL_IN:
468 case ACCESS_CONTROL_OUT:
469 case INQUIRY:
470 case LOG_SENSE:
471 case READ_MEDIA_SERIAL_NUMBER:
472 case REPORT_LUNS:
473 case REQUEST_SENSE:
474 case PERSISTENT_RESERVE_IN:
475 ret = 0; /*/ Allowed CDBs */
476 break;
477 default:
478 other_cdb = 1;
479 break;
480 }
481 /*
482 * Case where the CDB is explicitly allowed in the above switch
483 * statement.
484 */
485 if (!(ret) && !(other_cdb)) {
486 #if 0
487 printk(KERN_INFO "Allowing explict CDB: 0x%02x for %s"
488 " reservation holder\n", cdb[0],
489 core_scsi3_pr_dump_type(pr_reg_type));
490 #endif
491 return ret;
492 }
493 /*
494 * Check if write exclusive initiator ports *NOT* holding the
495 * WRITE_EXCLUSIVE_* reservation.
496 */
497 if ((we) && !(registered_nexus)) {
498 if (cmd->data_direction == DMA_TO_DEVICE) {
499 /*
500 * Conflict for write exclusive
501 */
502 printk(KERN_INFO "%s Conflict for unregistered nexus"
503 " %s CDB: 0x%02x to %s reservation\n",
504 transport_dump_cmd_direction(cmd),
505 se_sess->se_node_acl->initiatorname, cdb[0],
506 core_scsi3_pr_dump_type(pr_reg_type));
507 return 1;
508 } else {
509 /*
510 * Allow non WRITE CDBs for all Write Exclusive
511 * PR TYPEs to pass for registered and
512 * non-registered_nexuxes NOT holding the reservation.
513 *
514 * We only make noise for the unregisterd nexuses,
515 * as we expect registered non-reservation holding
516 * nexuses to issue CDBs.
517 */
518 #if 0
519 if (!(registered_nexus)) {
520 printk(KERN_INFO "Allowing implict CDB: 0x%02x"
521 " for %s reservation on unregistered"
522 " nexus\n", cdb[0],
523 core_scsi3_pr_dump_type(pr_reg_type));
524 }
525 #endif
526 return 0;
527 }
528 } else if ((reg_only) || (all_reg)) {
529 if (registered_nexus) {
530 /*
531 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
532 * allow commands from registered nexuses.
533 */
534 #if 0
535 printk(KERN_INFO "Allowing implict CDB: 0x%02x for %s"
536 " reservation\n", cdb[0],
537 core_scsi3_pr_dump_type(pr_reg_type));
538 #endif
539 return 0;
540 }
541 }
542 printk(KERN_INFO "%s Conflict for %sregistered nexus %s CDB: 0x%2x"
543 " for %s reservation\n", transport_dump_cmd_direction(cmd),
544 (registered_nexus) ? "" : "un",
545 se_sess->se_node_acl->initiatorname, cdb[0],
546 core_scsi3_pr_dump_type(pr_reg_type));
547
548 return 1; /* Conflict by default */
549 }
550
551 static u32 core_scsi3_pr_generation(struct se_device *dev)
552 {
553 struct se_subsystem_dev *su_dev = SU_DEV(dev);
554 u32 prg;
555 /*
556 * PRGeneration field shall contain the value of a 32-bit wrapping
557 * counter mainted by the device server.
558 *
559 * Note that this is done regardless of Active Persist across
560 * Target PowerLoss (APTPL)
561 *
562 * See spc4r17 section 6.3.12 READ_KEYS service action
563 */
564 spin_lock(&dev->dev_reservation_lock);
565 prg = T10_RES(su_dev)->pr_generation++;
566 spin_unlock(&dev->dev_reservation_lock);
567
568 return prg;
569 }
570
571 static int core_scsi3_pr_reservation_check(
572 struct se_cmd *cmd,
573 u32 *pr_reg_type)
574 {
575 struct se_device *dev = cmd->se_dev;
576 struct se_session *sess = cmd->se_sess;
577 int ret;
578
579 if (!(sess))
580 return 0;
581 /*
582 * A legacy SPC-2 reservation is being held.
583 */
584 if (dev->dev_flags & DF_SPC2_RESERVATIONS)
585 return core_scsi2_reservation_check(cmd, pr_reg_type);
586
587 spin_lock(&dev->dev_reservation_lock);
588 if (!(dev->dev_pr_res_holder)) {
589 spin_unlock(&dev->dev_reservation_lock);
590 return 0;
591 }
592 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
593 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
594 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
595 spin_unlock(&dev->dev_reservation_lock);
596 return -1;
597 }
598 if (!(dev->dev_pr_res_holder->isid_present_at_reg)) {
599 spin_unlock(&dev->dev_reservation_lock);
600 return 0;
601 }
602 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
603 sess->sess_bin_isid) ? 0 : -1;
604 /*
605 * Use bit in *pr_reg_type to notify ISID mismatch in
606 * core_scsi3_pr_seq_non_holder().
607 */
608 if (ret != 0)
609 *pr_reg_type |= 0x80000000;
610 spin_unlock(&dev->dev_reservation_lock);
611
612 return ret;
613 }
614
615 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
616 struct se_device *dev,
617 struct se_node_acl *nacl,
618 struct se_dev_entry *deve,
619 unsigned char *isid,
620 u64 sa_res_key,
621 int all_tg_pt,
622 int aptpl)
623 {
624 struct se_subsystem_dev *su_dev = SU_DEV(dev);
625 struct t10_pr_registration *pr_reg;
626
627 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
628 if (!(pr_reg)) {
629 printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
630 return NULL;
631 }
632
633 pr_reg->pr_aptpl_buf = kzalloc(T10_RES(su_dev)->pr_aptpl_buf_len,
634 GFP_ATOMIC);
635 if (!(pr_reg->pr_aptpl_buf)) {
636 printk(KERN_ERR "Unable to allocate pr_reg->pr_aptpl_buf\n");
637 kmem_cache_free(t10_pr_reg_cache, pr_reg);
638 return NULL;
639 }
640
641 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
642 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
643 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
644 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
645 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
646 atomic_set(&pr_reg->pr_res_holders, 0);
647 pr_reg->pr_reg_nacl = nacl;
648 pr_reg->pr_reg_deve = deve;
649 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
650 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
651 pr_reg->pr_res_key = sa_res_key;
652 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
653 pr_reg->pr_reg_aptpl = aptpl;
654 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
655 /*
656 * If an ISID value for this SCSI Initiator Port exists,
657 * save it to the registration now.
658 */
659 if (isid != NULL) {
660 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
661 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
662 pr_reg->isid_present_at_reg = 1;
663 }
664
665 return pr_reg;
666 }
667
668 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
669 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
670
671 /*
672 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
673 * modes.
674 */
675 static struct t10_pr_registration *__core_scsi3_alloc_registration(
676 struct se_device *dev,
677 struct se_node_acl *nacl,
678 struct se_dev_entry *deve,
679 unsigned char *isid,
680 u64 sa_res_key,
681 int all_tg_pt,
682 int aptpl)
683 {
684 struct se_dev_entry *deve_tmp;
685 struct se_node_acl *nacl_tmp;
686 struct se_port *port, *port_tmp;
687 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
688 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
689 int ret;
690 /*
691 * Create a registration for the I_T Nexus upon which the
692 * PROUT REGISTER was received.
693 */
694 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
695 sa_res_key, all_tg_pt, aptpl);
696 if (!(pr_reg))
697 return NULL;
698 /*
699 * Return pointer to pr_reg for ALL_TG_PT=0
700 */
701 if (!(all_tg_pt))
702 return pr_reg;
703 /*
704 * Create list of matching SCSI Initiator Port registrations
705 * for ALL_TG_PT=1
706 */
707 spin_lock(&dev->se_port_lock);
708 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
709 atomic_inc(&port->sep_tg_pt_ref_cnt);
710 smp_mb__after_atomic_inc();
711 spin_unlock(&dev->se_port_lock);
712
713 spin_lock_bh(&port->sep_alua_lock);
714 list_for_each_entry(deve_tmp, &port->sep_alua_list,
715 alua_port_list) {
716 /*
717 * This pointer will be NULL for demo mode MappedLUNs
718 * that have not been make explict via a ConfigFS
719 * MappedLUN group for the SCSI Initiator Node ACL.
720 */
721 if (!(deve_tmp->se_lun_acl))
722 continue;
723
724 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
725 /*
726 * Skip the matching struct se_node_acl that is allocated
727 * above..
728 */
729 if (nacl == nacl_tmp)
730 continue;
731 /*
732 * Only perform PR registrations for target ports on
733 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
734 * arrived.
735 */
736 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
737 continue;
738 /*
739 * Look for a matching Initiator Node ACL in ASCII format
740 */
741 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
742 continue;
743
744 atomic_inc(&deve_tmp->pr_ref_count);
745 smp_mb__after_atomic_inc();
746 spin_unlock_bh(&port->sep_alua_lock);
747 /*
748 * Grab a configfs group dependency that is released
749 * for the exception path at label out: below, or upon
750 * completion of adding ALL_TG_PT=1 registrations in
751 * __core_scsi3_add_registration()
752 */
753 ret = core_scsi3_lunacl_depend_item(deve_tmp);
754 if (ret < 0) {
755 printk(KERN_ERR "core_scsi3_lunacl_depend"
756 "_item() failed\n");
757 atomic_dec(&port->sep_tg_pt_ref_cnt);
758 smp_mb__after_atomic_dec();
759 atomic_dec(&deve_tmp->pr_ref_count);
760 smp_mb__after_atomic_dec();
761 goto out;
762 }
763 /*
764 * Located a matching SCSI Initiator Port on a different
765 * port, allocate the pr_reg_atp and attach it to the
766 * pr_reg->pr_reg_atp_list that will be processed once
767 * the original *pr_reg is processed in
768 * __core_scsi3_add_registration()
769 */
770 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
771 nacl_tmp, deve_tmp, NULL,
772 sa_res_key, all_tg_pt, aptpl);
773 if (!(pr_reg_atp)) {
774 atomic_dec(&port->sep_tg_pt_ref_cnt);
775 smp_mb__after_atomic_dec();
776 atomic_dec(&deve_tmp->pr_ref_count);
777 smp_mb__after_atomic_dec();
778 core_scsi3_lunacl_undepend_item(deve_tmp);
779 goto out;
780 }
781
782 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
783 &pr_reg->pr_reg_atp_list);
784 spin_lock_bh(&port->sep_alua_lock);
785 }
786 spin_unlock_bh(&port->sep_alua_lock);
787
788 spin_lock(&dev->se_port_lock);
789 atomic_dec(&port->sep_tg_pt_ref_cnt);
790 smp_mb__after_atomic_dec();
791 }
792 spin_unlock(&dev->se_port_lock);
793
794 return pr_reg;
795 out:
796 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
797 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
798 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
799 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
800 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
801 }
802 kmem_cache_free(t10_pr_reg_cache, pr_reg);
803 return NULL;
804 }
805
806 int core_scsi3_alloc_aptpl_registration(
807 struct t10_reservation_template *pr_tmpl,
808 u64 sa_res_key,
809 unsigned char *i_port,
810 unsigned char *isid,
811 u32 mapped_lun,
812 unsigned char *t_port,
813 u16 tpgt,
814 u32 target_lun,
815 int res_holder,
816 int all_tg_pt,
817 u8 type)
818 {
819 struct t10_pr_registration *pr_reg;
820
821 if (!(i_port) || !(t_port) || !(sa_res_key)) {
822 printk(KERN_ERR "Illegal parameters for APTPL registration\n");
823 return -1;
824 }
825
826 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
827 if (!(pr_reg)) {
828 printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
829 return -1;
830 }
831 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
832
833 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
834 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
835 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
836 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
837 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
838 atomic_set(&pr_reg->pr_res_holders, 0);
839 pr_reg->pr_reg_nacl = NULL;
840 pr_reg->pr_reg_deve = NULL;
841 pr_reg->pr_res_mapped_lun = mapped_lun;
842 pr_reg->pr_aptpl_target_lun = target_lun;
843 pr_reg->pr_res_key = sa_res_key;
844 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
845 pr_reg->pr_reg_aptpl = 1;
846 pr_reg->pr_reg_tg_pt_lun = NULL;
847 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
848 pr_reg->pr_res_type = type;
849 /*
850 * If an ISID value had been saved in APTPL metadata for this
851 * SCSI Initiator Port, restore it now.
852 */
853 if (isid != NULL) {
854 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
855 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
856 pr_reg->isid_present_at_reg = 1;
857 }
858 /*
859 * Copy the i_port and t_port information from caller.
860 */
861 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
862 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
863 pr_reg->pr_reg_tpgt = tpgt;
864 /*
865 * Set pr_res_holder from caller, the pr_reg who is the reservation
866 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
867 * the Initiator Node LUN ACL from the fabric module is created for
868 * this registration.
869 */
870 pr_reg->pr_res_holder = res_holder;
871
872 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
873 printk(KERN_INFO "SPC-3 PR APTPL Successfully added registration%s from"
874 " metadata\n", (res_holder) ? "+reservation" : "");
875 return 0;
876 }
877
878 static void core_scsi3_aptpl_reserve(
879 struct se_device *dev,
880 struct se_portal_group *tpg,
881 struct se_node_acl *node_acl,
882 struct t10_pr_registration *pr_reg)
883 {
884 char i_buf[PR_REG_ISID_ID_LEN];
885 int prf_isid;
886
887 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
888 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
889 PR_REG_ISID_ID_LEN);
890
891 spin_lock(&dev->dev_reservation_lock);
892 dev->dev_pr_res_holder = pr_reg;
893 spin_unlock(&dev->dev_reservation_lock);
894
895 printk(KERN_INFO "SPC-3 PR [%s] Service Action: APTPL RESERVE created"
896 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
897 TPG_TFO(tpg)->get_fabric_name(),
898 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
899 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
900 printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
901 TPG_TFO(tpg)->get_fabric_name(), node_acl->initiatorname,
902 (prf_isid) ? &i_buf[0] : "");
903 }
904
905 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
906 struct t10_pr_registration *, int, int);
907
908 static int __core_scsi3_check_aptpl_registration(
909 struct se_device *dev,
910 struct se_portal_group *tpg,
911 struct se_lun *lun,
912 u32 target_lun,
913 struct se_node_acl *nacl,
914 struct se_dev_entry *deve)
915 {
916 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
917 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
918 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
919 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
920 u16 tpgt;
921
922 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
923 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
924 /*
925 * Copy Initiator Port information from struct se_node_acl
926 */
927 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
928 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
929 TPG_TFO(tpg)->tpg_get_wwn(tpg));
930 tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg);
931 /*
932 * Look for the matching registrations+reservation from those
933 * created from APTPL metadata. Note that multiple registrations
934 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
935 * TransportIDs.
936 */
937 spin_lock(&pr_tmpl->aptpl_reg_lock);
938 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
939 pr_reg_aptpl_list) {
940 if (!(strcmp(pr_reg->pr_iport, i_port)) &&
941 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
942 !(strcmp(pr_reg->pr_tport, t_port)) &&
943 (pr_reg->pr_reg_tpgt == tpgt) &&
944 (pr_reg->pr_aptpl_target_lun == target_lun)) {
945
946 pr_reg->pr_reg_nacl = nacl;
947 pr_reg->pr_reg_deve = deve;
948 pr_reg->pr_reg_tg_pt_lun = lun;
949
950 list_del(&pr_reg->pr_reg_aptpl_list);
951 spin_unlock(&pr_tmpl->aptpl_reg_lock);
952 /*
953 * At this point all of the pointers in *pr_reg will
954 * be setup, so go ahead and add the registration.
955 */
956
957 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
958 /*
959 * If this registration is the reservation holder,
960 * make that happen now..
961 */
962 if (pr_reg->pr_res_holder)
963 core_scsi3_aptpl_reserve(dev, tpg,
964 nacl, pr_reg);
965 /*
966 * Reenable pr_aptpl_active to accept new metadata
967 * updates once the SCSI device is active again..
968 */
969 spin_lock(&pr_tmpl->aptpl_reg_lock);
970 pr_tmpl->pr_aptpl_active = 1;
971 }
972 }
973 spin_unlock(&pr_tmpl->aptpl_reg_lock);
974
975 return 0;
976 }
977
978 int core_scsi3_check_aptpl_registration(
979 struct se_device *dev,
980 struct se_portal_group *tpg,
981 struct se_lun *lun,
982 struct se_lun_acl *lun_acl)
983 {
984 struct se_subsystem_dev *su_dev = SU_DEV(dev);
985 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
986 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
987
988 if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
989 return 0;
990
991 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
992 lun->unpacked_lun, nacl, deve);
993 }
994
995 static void __core_scsi3_dump_registration(
996 struct target_core_fabric_ops *tfo,
997 struct se_device *dev,
998 struct se_node_acl *nacl,
999 struct t10_pr_registration *pr_reg,
1000 int register_type)
1001 {
1002 struct se_portal_group *se_tpg = nacl->se_tpg;
1003 char i_buf[PR_REG_ISID_ID_LEN];
1004 int prf_isid;
1005
1006 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1007 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1008 PR_REG_ISID_ID_LEN);
1009
1010 printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1011 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1012 "_AND_MOVE" : (register_type == 1) ?
1013 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1014 (prf_isid) ? i_buf : "");
1015 printk(KERN_INFO "SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1016 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1017 tfo->tpg_get_tag(se_tpg));
1018 printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1019 " Port(s)\n", tfo->get_fabric_name(),
1020 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1021 TRANSPORT(dev)->name);
1022 printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1023 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1024 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1025 pr_reg->pr_reg_aptpl);
1026 }
1027
1028 /*
1029 * this function can be called with struct se_device->dev_reservation_lock
1030 * when register_move = 1
1031 */
1032 static void __core_scsi3_add_registration(
1033 struct se_device *dev,
1034 struct se_node_acl *nacl,
1035 struct t10_pr_registration *pr_reg,
1036 int register_type,
1037 int register_move)
1038 {
1039 struct se_subsystem_dev *su_dev = SU_DEV(dev);
1040 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1041 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1042 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1043
1044 /*
1045 * Increment PRgeneration counter for struct se_device upon a successful
1046 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1047 *
1048 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1049 * action, the struct se_device->dev_reservation_lock will already be held,
1050 * so we do not call core_scsi3_pr_generation() which grabs the lock
1051 * for the REGISTER.
1052 */
1053 pr_reg->pr_res_generation = (register_move) ?
1054 T10_RES(su_dev)->pr_generation++ :
1055 core_scsi3_pr_generation(dev);
1056
1057 spin_lock(&pr_tmpl->registration_lock);
1058 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1059 pr_reg->pr_reg_deve->def_pr_registered = 1;
1060
1061 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1062 spin_unlock(&pr_tmpl->registration_lock);
1063 /*
1064 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1065 */
1066 if (!(pr_reg->pr_reg_all_tg_pt) || (register_move))
1067 return;
1068 /*
1069 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1070 * allocated in __core_scsi3_alloc_registration()
1071 */
1072 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1073 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1074 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1075
1076 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1077
1078 spin_lock(&pr_tmpl->registration_lock);
1079 list_add_tail(&pr_reg_tmp->pr_reg_list,
1080 &pr_tmpl->registration_list);
1081 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1082
1083 __core_scsi3_dump_registration(tfo, dev,
1084 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1085 register_type);
1086 spin_unlock(&pr_tmpl->registration_lock);
1087 /*
1088 * Drop configfs group dependency reference from
1089 * __core_scsi3_alloc_registration()
1090 */
1091 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1092 }
1093 }
1094
1095 static int core_scsi3_alloc_registration(
1096 struct se_device *dev,
1097 struct se_node_acl *nacl,
1098 struct se_dev_entry *deve,
1099 unsigned char *isid,
1100 u64 sa_res_key,
1101 int all_tg_pt,
1102 int aptpl,
1103 int register_type,
1104 int register_move)
1105 {
1106 struct t10_pr_registration *pr_reg;
1107
1108 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1109 sa_res_key, all_tg_pt, aptpl);
1110 if (!(pr_reg))
1111 return -1;
1112
1113 __core_scsi3_add_registration(dev, nacl, pr_reg,
1114 register_type, register_move);
1115 return 0;
1116 }
1117
1118 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1119 struct se_device *dev,
1120 struct se_node_acl *nacl,
1121 unsigned char *isid)
1122 {
1123 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1124 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1125 struct se_portal_group *tpg;
1126
1127 spin_lock(&pr_tmpl->registration_lock);
1128 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1129 &pr_tmpl->registration_list, pr_reg_list) {
1130 /*
1131 * First look for a matching struct se_node_acl
1132 */
1133 if (pr_reg->pr_reg_nacl != nacl)
1134 continue;
1135
1136 tpg = pr_reg->pr_reg_nacl->se_tpg;
1137 /*
1138 * If this registration does NOT contain a fabric provided
1139 * ISID, then we have found a match.
1140 */
1141 if (!(pr_reg->isid_present_at_reg)) {
1142 /*
1143 * Determine if this SCSI device server requires that
1144 * SCSI Intiatior TransportID w/ ISIDs is enforced
1145 * for fabric modules (iSCSI) requiring them.
1146 */
1147 if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
1148 if (DEV_ATTRIB(dev)->enforce_pr_isids)
1149 continue;
1150 }
1151 atomic_inc(&pr_reg->pr_res_holders);
1152 smp_mb__after_atomic_inc();
1153 spin_unlock(&pr_tmpl->registration_lock);
1154 return pr_reg;
1155 }
1156 /*
1157 * If the *pr_reg contains a fabric defined ISID for multi-value
1158 * SCSI Initiator Port TransportIDs, then we expect a valid
1159 * matching ISID to be provided by the local SCSI Initiator Port.
1160 */
1161 if (!(isid))
1162 continue;
1163 if (strcmp(isid, pr_reg->pr_reg_isid))
1164 continue;
1165
1166 atomic_inc(&pr_reg->pr_res_holders);
1167 smp_mb__after_atomic_inc();
1168 spin_unlock(&pr_tmpl->registration_lock);
1169 return pr_reg;
1170 }
1171 spin_unlock(&pr_tmpl->registration_lock);
1172
1173 return NULL;
1174 }
1175
1176 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1177 struct se_device *dev,
1178 struct se_node_acl *nacl,
1179 struct se_session *sess)
1180 {
1181 struct se_portal_group *tpg = nacl->se_tpg;
1182 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1183
1184 if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
1185 memset(&buf[0], 0, PR_REG_ISID_LEN);
1186 TPG_TFO(tpg)->sess_get_initiator_sid(sess, &buf[0],
1187 PR_REG_ISID_LEN);
1188 isid_ptr = &buf[0];
1189 }
1190
1191 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1192 }
1193
1194 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1195 {
1196 atomic_dec(&pr_reg->pr_res_holders);
1197 smp_mb__after_atomic_dec();
1198 }
1199
1200 static int core_scsi3_check_implict_release(
1201 struct se_device *dev,
1202 struct t10_pr_registration *pr_reg)
1203 {
1204 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1205 struct t10_pr_registration *pr_res_holder;
1206 int ret = 0;
1207
1208 spin_lock(&dev->dev_reservation_lock);
1209 pr_res_holder = dev->dev_pr_res_holder;
1210 if (!(pr_res_holder)) {
1211 spin_unlock(&dev->dev_reservation_lock);
1212 return ret;
1213 }
1214 if (pr_res_holder == pr_reg) {
1215 /*
1216 * Perform an implict RELEASE if the registration that
1217 * is being released is holding the reservation.
1218 *
1219 * From spc4r17, section 5.7.11.1:
1220 *
1221 * e) If the I_T nexus is the persistent reservation holder
1222 * and the persistent reservation is not an all registrants
1223 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1224 * service action or REGISTER AND IGNORE EXISTING KEY
1225 * service action with the SERVICE ACTION RESERVATION KEY
1226 * field set to zero (see 5.7.11.3).
1227 */
1228 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1229 ret = 1;
1230 /*
1231 * For 'All Registrants' reservation types, all existing
1232 * registrations are still processed as reservation holders
1233 * in core_scsi3_pr_seq_non_holder() after the initial
1234 * reservation holder is implictly released here.
1235 */
1236 } else if (pr_reg->pr_reg_all_tg_pt &&
1237 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1238 pr_reg->pr_reg_nacl->initiatorname)) &&
1239 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1240 printk(KERN_ERR "SPC-3 PR: Unable to perform ALL_TG_PT=1"
1241 " UNREGISTER while existing reservation with matching"
1242 " key 0x%016Lx is present from another SCSI Initiator"
1243 " Port\n", pr_reg->pr_res_key);
1244 ret = -1;
1245 }
1246 spin_unlock(&dev->dev_reservation_lock);
1247
1248 return ret;
1249 }
1250
1251 /*
1252 * Called with struct t10_reservation_template->registration_lock held.
1253 */
1254 static void __core_scsi3_free_registration(
1255 struct se_device *dev,
1256 struct t10_pr_registration *pr_reg,
1257 struct list_head *preempt_and_abort_list,
1258 int dec_holders)
1259 {
1260 struct target_core_fabric_ops *tfo =
1261 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1262 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1263 char i_buf[PR_REG_ISID_ID_LEN];
1264 int prf_isid;
1265
1266 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1267 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1268 PR_REG_ISID_ID_LEN);
1269
1270 pr_reg->pr_reg_deve->def_pr_registered = 0;
1271 pr_reg->pr_reg_deve->pr_res_key = 0;
1272 list_del(&pr_reg->pr_reg_list);
1273 /*
1274 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1275 * so call core_scsi3_put_pr_reg() to decrement our reference.
1276 */
1277 if (dec_holders)
1278 core_scsi3_put_pr_reg(pr_reg);
1279 /*
1280 * Wait until all reference from any other I_T nexuses for this
1281 * *pr_reg have been released. Because list_del() is called above,
1282 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1283 * count back to zero, and we release *pr_reg.
1284 */
1285 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1286 spin_unlock(&pr_tmpl->registration_lock);
1287 printk("SPC-3 PR [%s] waiting for pr_res_holders\n",
1288 tfo->get_fabric_name());
1289 cpu_relax();
1290 spin_lock(&pr_tmpl->registration_lock);
1291 }
1292
1293 printk(KERN_INFO "SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1294 " Node: %s%s\n", tfo->get_fabric_name(),
1295 pr_reg->pr_reg_nacl->initiatorname,
1296 (prf_isid) ? &i_buf[0] : "");
1297 printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1298 " Port(s)\n", tfo->get_fabric_name(),
1299 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1300 TRANSPORT(dev)->name);
1301 printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1302 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1303 pr_reg->pr_res_generation);
1304
1305 if (!(preempt_and_abort_list)) {
1306 pr_reg->pr_reg_deve = NULL;
1307 pr_reg->pr_reg_nacl = NULL;
1308 kfree(pr_reg->pr_aptpl_buf);
1309 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1310 return;
1311 }
1312 /*
1313 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1314 * are released once the ABORT_TASK_SET has completed..
1315 */
1316 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1317 }
1318
1319 void core_scsi3_free_pr_reg_from_nacl(
1320 struct se_device *dev,
1321 struct se_node_acl *nacl)
1322 {
1323 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1324 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1325 /*
1326 * If the passed se_node_acl matches the reservation holder,
1327 * release the reservation.
1328 */
1329 spin_lock(&dev->dev_reservation_lock);
1330 pr_res_holder = dev->dev_pr_res_holder;
1331 if ((pr_res_holder != NULL) &&
1332 (pr_res_holder->pr_reg_nacl == nacl))
1333 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1334 spin_unlock(&dev->dev_reservation_lock);
1335 /*
1336 * Release any registration associated with the struct se_node_acl.
1337 */
1338 spin_lock(&pr_tmpl->registration_lock);
1339 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1340 &pr_tmpl->registration_list, pr_reg_list) {
1341
1342 if (pr_reg->pr_reg_nacl != nacl)
1343 continue;
1344
1345 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1346 }
1347 spin_unlock(&pr_tmpl->registration_lock);
1348 }
1349
1350 void core_scsi3_free_all_registrations(
1351 struct se_device *dev)
1352 {
1353 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1354 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1355
1356 spin_lock(&dev->dev_reservation_lock);
1357 pr_res_holder = dev->dev_pr_res_holder;
1358 if (pr_res_holder != NULL) {
1359 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1360 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1361 pr_res_holder, 0);
1362 }
1363 spin_unlock(&dev->dev_reservation_lock);
1364
1365 spin_lock(&pr_tmpl->registration_lock);
1366 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1367 &pr_tmpl->registration_list, pr_reg_list) {
1368
1369 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1370 }
1371 spin_unlock(&pr_tmpl->registration_lock);
1372
1373 spin_lock(&pr_tmpl->aptpl_reg_lock);
1374 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1375 pr_reg_aptpl_list) {
1376 list_del(&pr_reg->pr_reg_aptpl_list);
1377 kfree(pr_reg->pr_aptpl_buf);
1378 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1379 }
1380 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1381 }
1382
1383 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1384 {
1385 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1386 &tpg->tpg_group.cg_item);
1387 }
1388
1389 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1390 {
1391 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1392 &tpg->tpg_group.cg_item);
1393
1394 atomic_dec(&tpg->tpg_pr_ref_count);
1395 smp_mb__after_atomic_dec();
1396 }
1397
1398 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1399 {
1400 struct se_portal_group *tpg = nacl->se_tpg;
1401
1402 if (nacl->dynamic_node_acl)
1403 return 0;
1404
1405 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1406 &nacl->acl_group.cg_item);
1407 }
1408
1409 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1410 {
1411 struct se_portal_group *tpg = nacl->se_tpg;
1412
1413 if (nacl->dynamic_node_acl) {
1414 atomic_dec(&nacl->acl_pr_ref_count);
1415 smp_mb__after_atomic_dec();
1416 return;
1417 }
1418
1419 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1420 &nacl->acl_group.cg_item);
1421
1422 atomic_dec(&nacl->acl_pr_ref_count);
1423 smp_mb__after_atomic_dec();
1424 }
1425
1426 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1427 {
1428 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1429 struct se_node_acl *nacl;
1430 struct se_portal_group *tpg;
1431 /*
1432 * For nacl->dynamic_node_acl=1
1433 */
1434 if (!(lun_acl))
1435 return 0;
1436
1437 nacl = lun_acl->se_lun_nacl;
1438 tpg = nacl->se_tpg;
1439
1440 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1441 &lun_acl->se_lun_group.cg_item);
1442 }
1443
1444 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1445 {
1446 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1447 struct se_node_acl *nacl;
1448 struct se_portal_group *tpg;
1449 /*
1450 * For nacl->dynamic_node_acl=1
1451 */
1452 if (!(lun_acl)) {
1453 atomic_dec(&se_deve->pr_ref_count);
1454 smp_mb__after_atomic_dec();
1455 return;
1456 }
1457 nacl = lun_acl->se_lun_nacl;
1458 tpg = nacl->se_tpg;
1459
1460 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1461 &lun_acl->se_lun_group.cg_item);
1462
1463 atomic_dec(&se_deve->pr_ref_count);
1464 smp_mb__after_atomic_dec();
1465 }
1466
1467 static int core_scsi3_decode_spec_i_port(
1468 struct se_cmd *cmd,
1469 struct se_portal_group *tpg,
1470 unsigned char *l_isid,
1471 u64 sa_res_key,
1472 int all_tg_pt,
1473 int aptpl)
1474 {
1475 struct se_device *dev = SE_DEV(cmd);
1476 struct se_port *tmp_port;
1477 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1478 struct se_session *se_sess = SE_SESS(cmd);
1479 struct se_node_acl *dest_node_acl = NULL;
1480 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1481 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1482 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1483 struct list_head tid_dest_list;
1484 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1485 struct target_core_fabric_ops *tmp_tf_ops;
1486 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
1487 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1488 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1489 u32 tpdl, tid_len = 0;
1490 int ret, dest_local_nexus, prf_isid;
1491 u32 dest_rtpi = 0;
1492
1493 memset(dest_iport, 0, 64);
1494 INIT_LIST_HEAD(&tid_dest_list);
1495
1496 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1497 /*
1498 * Allocate a struct pr_transport_id_holder and setup the
1499 * local_node_acl and local_se_deve pointers and add to
1500 * struct list_head tid_dest_list for add registration
1501 * processing in the loop of tid_dest_list below.
1502 */
1503 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1504 if (!(tidh_new)) {
1505 printk(KERN_ERR "Unable to allocate tidh_new\n");
1506 return PYX_TRANSPORT_LU_COMM_FAILURE;
1507 }
1508 INIT_LIST_HEAD(&tidh_new->dest_list);
1509 tidh_new->dest_tpg = tpg;
1510 tidh_new->dest_node_acl = se_sess->se_node_acl;
1511 tidh_new->dest_se_deve = local_se_deve;
1512
1513 local_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
1514 se_sess->se_node_acl, local_se_deve, l_isid,
1515 sa_res_key, all_tg_pt, aptpl);
1516 if (!(local_pr_reg)) {
1517 kfree(tidh_new);
1518 return PYX_TRANSPORT_LU_COMM_FAILURE;
1519 }
1520 tidh_new->dest_pr_reg = local_pr_reg;
1521 /*
1522 * The local I_T nexus does not hold any configfs dependances,
1523 * so we set tid_h->dest_local_nexus=1 to prevent the
1524 * configfs_undepend_item() calls in the tid_dest_list loops below.
1525 */
1526 tidh_new->dest_local_nexus = 1;
1527 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1528 /*
1529 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1530 * first extract TransportID Parameter Data Length, and make sure
1531 * the value matches up to the SCSI expected data transfer length.
1532 */
1533 tpdl = (buf[24] & 0xff) << 24;
1534 tpdl |= (buf[25] & 0xff) << 16;
1535 tpdl |= (buf[26] & 0xff) << 8;
1536 tpdl |= buf[27] & 0xff;
1537
1538 if ((tpdl + 28) != cmd->data_length) {
1539 printk(KERN_ERR "SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1540 " does not equal CDB data_length: %u\n", tpdl,
1541 cmd->data_length);
1542 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1543 goto out;
1544 }
1545 /*
1546 * Start processing the received transport IDs using the
1547 * receiving I_T Nexus portal's fabric dependent methods to
1548 * obtain the SCSI Initiator Port/Device Identifiers.
1549 */
1550 ptr = &buf[28];
1551
1552 while (tpdl > 0) {
1553 proto_ident = (ptr[0] & 0x0f);
1554 dest_tpg = NULL;
1555
1556 spin_lock(&dev->se_port_lock);
1557 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1558 tmp_tpg = tmp_port->sep_tpg;
1559 if (!(tmp_tpg))
1560 continue;
1561 tmp_tf_ops = TPG_TFO(tmp_tpg);
1562 if (!(tmp_tf_ops))
1563 continue;
1564 if (!(tmp_tf_ops->get_fabric_proto_ident) ||
1565 !(tmp_tf_ops->tpg_parse_pr_out_transport_id))
1566 continue;
1567 /*
1568 * Look for the matching proto_ident provided by
1569 * the received TransportID
1570 */
1571 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1572 if (tmp_proto_ident != proto_ident)
1573 continue;
1574 dest_rtpi = tmp_port->sep_rtpi;
1575
1576 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1577 tmp_tpg, (const char *)ptr, &tid_len,
1578 &iport_ptr);
1579 if (!(i_str))
1580 continue;
1581
1582 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1583 smp_mb__after_atomic_inc();
1584 spin_unlock(&dev->se_port_lock);
1585
1586 ret = core_scsi3_tpg_depend_item(tmp_tpg);
1587 if (ret != 0) {
1588 printk(KERN_ERR " core_scsi3_tpg_depend_item()"
1589 " for tmp_tpg\n");
1590 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1591 smp_mb__after_atomic_dec();
1592 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1593 goto out;
1594 }
1595 /*
1596 * Locate the desination initiator ACL to be registered
1597 * from the decoded fabric module specific TransportID
1598 * at *i_str.
1599 */
1600 spin_lock_bh(&tmp_tpg->acl_node_lock);
1601 dest_node_acl = __core_tpg_get_initiator_node_acl(
1602 tmp_tpg, i_str);
1603 if (dest_node_acl) {
1604 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1605 smp_mb__after_atomic_inc();
1606 }
1607 spin_unlock_bh(&tmp_tpg->acl_node_lock);
1608
1609 if (!(dest_node_acl)) {
1610 core_scsi3_tpg_undepend_item(tmp_tpg);
1611 spin_lock(&dev->se_port_lock);
1612 continue;
1613 }
1614
1615 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1616 if (ret != 0) {
1617 printk(KERN_ERR "configfs_depend_item() failed"
1618 " for dest_node_acl->acl_group\n");
1619 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1620 smp_mb__after_atomic_dec();
1621 core_scsi3_tpg_undepend_item(tmp_tpg);
1622 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1623 goto out;
1624 }
1625
1626 dest_tpg = tmp_tpg;
1627 printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node:"
1628 " %s Port RTPI: %hu\n",
1629 TPG_TFO(dest_tpg)->get_fabric_name(),
1630 dest_node_acl->initiatorname, dest_rtpi);
1631
1632 spin_lock(&dev->se_port_lock);
1633 break;
1634 }
1635 spin_unlock(&dev->se_port_lock);
1636
1637 if (!(dest_tpg)) {
1638 printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Unable to locate"
1639 " dest_tpg\n");
1640 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1641 goto out;
1642 }
1643 #if 0
1644 printk("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1645 " tid_len: %d for %s + %s\n",
1646 TPG_TFO(dest_tpg)->get_fabric_name(), cmd->data_length,
1647 tpdl, tid_len, i_str, iport_ptr);
1648 #endif
1649 if (tid_len > tpdl) {
1650 printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1651 " %u for Transport ID: %s\n", tid_len, ptr);
1652 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1653 core_scsi3_tpg_undepend_item(dest_tpg);
1654 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1655 goto out;
1656 }
1657 /*
1658 * Locate the desintation struct se_dev_entry pointer for matching
1659 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1660 * Target Port.
1661 */
1662 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1663 dest_rtpi);
1664 if (!(dest_se_deve)) {
1665 printk(KERN_ERR "Unable to locate %s dest_se_deve"
1666 " from destination RTPI: %hu\n",
1667 TPG_TFO(dest_tpg)->get_fabric_name(),
1668 dest_rtpi);
1669
1670 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1671 core_scsi3_tpg_undepend_item(dest_tpg);
1672 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1673 goto out;
1674 }
1675
1676 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1677 if (ret < 0) {
1678 printk(KERN_ERR "core_scsi3_lunacl_depend_item()"
1679 " failed\n");
1680 atomic_dec(&dest_se_deve->pr_ref_count);
1681 smp_mb__after_atomic_dec();
1682 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1683 core_scsi3_tpg_undepend_item(dest_tpg);
1684 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1685 goto out;
1686 }
1687 #if 0
1688 printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1689 " dest_se_deve mapped_lun: %u\n",
1690 TPG_TFO(dest_tpg)->get_fabric_name(),
1691 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1692 #endif
1693 /*
1694 * Skip any TransportIDs that already have a registration for
1695 * this target port.
1696 */
1697 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1698 iport_ptr);
1699 if (pr_reg_e) {
1700 core_scsi3_put_pr_reg(pr_reg_e);
1701 core_scsi3_lunacl_undepend_item(dest_se_deve);
1702 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1703 core_scsi3_tpg_undepend_item(dest_tpg);
1704 ptr += tid_len;
1705 tpdl -= tid_len;
1706 tid_len = 0;
1707 continue;
1708 }
1709 /*
1710 * Allocate a struct pr_transport_id_holder and setup
1711 * the dest_node_acl and dest_se_deve pointers for the
1712 * loop below.
1713 */
1714 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1715 GFP_KERNEL);
1716 if (!(tidh_new)) {
1717 printk(KERN_ERR "Unable to allocate tidh_new\n");
1718 core_scsi3_lunacl_undepend_item(dest_se_deve);
1719 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720 core_scsi3_tpg_undepend_item(dest_tpg);
1721 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1722 goto out;
1723 }
1724 INIT_LIST_HEAD(&tidh_new->dest_list);
1725 tidh_new->dest_tpg = dest_tpg;
1726 tidh_new->dest_node_acl = dest_node_acl;
1727 tidh_new->dest_se_deve = dest_se_deve;
1728
1729 /*
1730 * Allocate, but do NOT add the registration for the
1731 * TransportID referenced SCSI Initiator port. This
1732 * done because of the following from spc4r17 in section
1733 * 6.14.3 wrt SPEC_I_PT:
1734 *
1735 * "If a registration fails for any initiator port (e.g., if th
1736 * logical unit does not have enough resources available to
1737 * hold the registration information), no registrations shall be
1738 * made, and the command shall be terminated with
1739 * CHECK CONDITION status."
1740 *
1741 * That means we call __core_scsi3_alloc_registration() here,
1742 * and then call __core_scsi3_add_registration() in the
1743 * 2nd loop which will never fail.
1744 */
1745 dest_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
1746 dest_node_acl, dest_se_deve, iport_ptr,
1747 sa_res_key, all_tg_pt, aptpl);
1748 if (!(dest_pr_reg)) {
1749 core_scsi3_lunacl_undepend_item(dest_se_deve);
1750 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1751 core_scsi3_tpg_undepend_item(dest_tpg);
1752 kfree(tidh_new);
1753 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1754 goto out;
1755 }
1756 tidh_new->dest_pr_reg = dest_pr_reg;
1757 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1758
1759 ptr += tid_len;
1760 tpdl -= tid_len;
1761 tid_len = 0;
1762
1763 }
1764 /*
1765 * Go ahead and create a registrations from tid_dest_list for the
1766 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1767 * and dest_se_deve.
1768 *
1769 * The SA Reservation Key from the PROUT is set for the
1770 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1771 * means that the TransportID Initiator port will be
1772 * registered on all of the target ports in the SCSI target device
1773 * ALL_TG_PT=0 means the registration will only be for the
1774 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1775 * was received.
1776 */
1777 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1778 dest_tpg = tidh->dest_tpg;
1779 dest_node_acl = tidh->dest_node_acl;
1780 dest_se_deve = tidh->dest_se_deve;
1781 dest_pr_reg = tidh->dest_pr_reg;
1782 dest_local_nexus = tidh->dest_local_nexus;
1783
1784 list_del(&tidh->dest_list);
1785 kfree(tidh);
1786
1787 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1788 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1789 PR_REG_ISID_ID_LEN);
1790
1791 __core_scsi3_add_registration(SE_DEV(cmd), dest_node_acl,
1792 dest_pr_reg, 0, 0);
1793
1794 printk(KERN_INFO "SPC-3 PR [%s] SPEC_I_PT: Successfully"
1795 " registered Transport ID for Node: %s%s Mapped LUN:"
1796 " %u\n", TPG_TFO(dest_tpg)->get_fabric_name(),
1797 dest_node_acl->initiatorname, (prf_isid) ?
1798 &i_buf[0] : "", dest_se_deve->mapped_lun);
1799
1800 if (dest_local_nexus)
1801 continue;
1802
1803 core_scsi3_lunacl_undepend_item(dest_se_deve);
1804 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1805 core_scsi3_tpg_undepend_item(dest_tpg);
1806 }
1807
1808 return 0;
1809 out:
1810 /*
1811 * For the failure case, release everything from tid_dest_list
1812 * including *dest_pr_reg and the configfs dependances..
1813 */
1814 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1815 dest_tpg = tidh->dest_tpg;
1816 dest_node_acl = tidh->dest_node_acl;
1817 dest_se_deve = tidh->dest_se_deve;
1818 dest_pr_reg = tidh->dest_pr_reg;
1819 dest_local_nexus = tidh->dest_local_nexus;
1820
1821 list_del(&tidh->dest_list);
1822 kfree(tidh);
1823 /*
1824 * Release any extra ALL_TG_PT=1 registrations for
1825 * the SPEC_I_PT=1 case.
1826 */
1827 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1828 &dest_pr_reg->pr_reg_atp_list,
1829 pr_reg_atp_mem_list) {
1830 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1831 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1832 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1833 }
1834
1835 kfree(dest_pr_reg->pr_aptpl_buf);
1836 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1837
1838 if (dest_local_nexus)
1839 continue;
1840
1841 core_scsi3_lunacl_undepend_item(dest_se_deve);
1842 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1843 core_scsi3_tpg_undepend_item(dest_tpg);
1844 }
1845 return ret;
1846 }
1847
1848 /*
1849 * Called with struct se_device->dev_reservation_lock held
1850 */
1851 static int __core_scsi3_update_aptpl_buf(
1852 struct se_device *dev,
1853 unsigned char *buf,
1854 u32 pr_aptpl_buf_len,
1855 int clear_aptpl_metadata)
1856 {
1857 struct se_lun *lun;
1858 struct se_portal_group *tpg;
1859 struct se_subsystem_dev *su_dev = SU_DEV(dev);
1860 struct t10_pr_registration *pr_reg;
1861 unsigned char tmp[512], isid_buf[32];
1862 ssize_t len = 0;
1863 int reg_count = 0;
1864
1865 memset(buf, 0, pr_aptpl_buf_len);
1866 /*
1867 * Called to clear metadata once APTPL has been deactivated.
1868 */
1869 if (clear_aptpl_metadata) {
1870 snprintf(buf, pr_aptpl_buf_len,
1871 "No Registrations or Reservations\n");
1872 return 0;
1873 }
1874 /*
1875 * Walk the registration list..
1876 */
1877 spin_lock(&T10_RES(su_dev)->registration_lock);
1878 list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
1879 pr_reg_list) {
1880
1881 tmp[0] = '\0';
1882 isid_buf[0] = '\0';
1883 tpg = pr_reg->pr_reg_nacl->se_tpg;
1884 lun = pr_reg->pr_reg_tg_pt_lun;
1885 /*
1886 * Write out any ISID value to APTPL metadata that was included
1887 * in the original registration.
1888 */
1889 if (pr_reg->isid_present_at_reg)
1890 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1891 pr_reg->pr_reg_isid);
1892 /*
1893 * Include special metadata if the pr_reg matches the
1894 * reservation holder.
1895 */
1896 if (dev->dev_pr_res_holder == pr_reg) {
1897 snprintf(tmp, 512, "PR_REG_START: %d"
1898 "\ninitiator_fabric=%s\n"
1899 "initiator_node=%s\n%s"
1900 "sa_res_key=%llu\n"
1901 "res_holder=1\nres_type=%02x\n"
1902 "res_scope=%02x\nres_all_tg_pt=%d\n"
1903 "mapped_lun=%u\n", reg_count,
1904 TPG_TFO(tpg)->get_fabric_name(),
1905 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1906 pr_reg->pr_res_key, pr_reg->pr_res_type,
1907 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1908 pr_reg->pr_res_mapped_lun);
1909 } else {
1910 snprintf(tmp, 512, "PR_REG_START: %d\n"
1911 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1912 "sa_res_key=%llu\nres_holder=0\n"
1913 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1914 reg_count, TPG_TFO(tpg)->get_fabric_name(),
1915 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1916 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1917 pr_reg->pr_res_mapped_lun);
1918 }
1919
1920 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1921 printk(KERN_ERR "Unable to update renaming"
1922 " APTPL metadata\n");
1923 spin_unlock(&T10_RES(su_dev)->registration_lock);
1924 return -1;
1925 }
1926 len += sprintf(buf+len, "%s", tmp);
1927
1928 /*
1929 * Include information about the associated SCSI target port.
1930 */
1931 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1932 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1933 " %d\n", TPG_TFO(tpg)->get_fabric_name(),
1934 TPG_TFO(tpg)->tpg_get_wwn(tpg),
1935 TPG_TFO(tpg)->tpg_get_tag(tpg),
1936 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1937
1938 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1939 printk(KERN_ERR "Unable to update renaming"
1940 " APTPL metadata\n");
1941 spin_unlock(&T10_RES(su_dev)->registration_lock);
1942 return -1;
1943 }
1944 len += sprintf(buf+len, "%s", tmp);
1945 reg_count++;
1946 }
1947 spin_unlock(&T10_RES(su_dev)->registration_lock);
1948
1949 if (!(reg_count))
1950 len += sprintf(buf+len, "No Registrations or Reservations");
1951
1952 return 0;
1953 }
1954
1955 static int core_scsi3_update_aptpl_buf(
1956 struct se_device *dev,
1957 unsigned char *buf,
1958 u32 pr_aptpl_buf_len,
1959 int clear_aptpl_metadata)
1960 {
1961 int ret;
1962
1963 spin_lock(&dev->dev_reservation_lock);
1964 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1965 clear_aptpl_metadata);
1966 spin_unlock(&dev->dev_reservation_lock);
1967
1968 return ret;
1969 }
1970
1971 /*
1972 * Called with struct se_device->aptpl_file_mutex held
1973 */
1974 static int __core_scsi3_write_aptpl_to_file(
1975 struct se_device *dev,
1976 unsigned char *buf,
1977 u32 pr_aptpl_buf_len)
1978 {
1979 struct t10_wwn *wwn = &SU_DEV(dev)->t10_wwn;
1980 struct file *file;
1981 struct iovec iov[1];
1982 mm_segment_t old_fs;
1983 int flags = O_RDWR | O_CREAT | O_TRUNC;
1984 char path[512];
1985 int ret;
1986
1987 memset(iov, 0, sizeof(struct iovec));
1988 memset(path, 0, 512);
1989
1990 if (strlen(&wwn->unit_serial[0]) >= 512) {
1991 printk(KERN_ERR "WWN value for struct se_device does not fit"
1992 " into path buffer\n");
1993 return -1;
1994 }
1995
1996 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1997 file = filp_open(path, flags, 0600);
1998 if (IS_ERR(file) || !file || !file->f_dentry) {
1999 printk(KERN_ERR "filp_open(%s) for APTPL metadata"
2000 " failed\n", path);
2001 return -1;
2002 }
2003
2004 iov[0].iov_base = &buf[0];
2005 if (!(pr_aptpl_buf_len))
2006 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2007 else
2008 iov[0].iov_len = pr_aptpl_buf_len;
2009
2010 old_fs = get_fs();
2011 set_fs(get_ds());
2012 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2013 set_fs(old_fs);
2014
2015 if (ret < 0) {
2016 printk("Error writing APTPL metadata file: %s\n", path);
2017 filp_close(file, NULL);
2018 return -1;
2019 }
2020 filp_close(file, NULL);
2021
2022 return 0;
2023 }
2024
2025 static int core_scsi3_update_and_write_aptpl(
2026 struct se_device *dev,
2027 unsigned char *in_buf,
2028 u32 in_pr_aptpl_buf_len)
2029 {
2030 unsigned char null_buf[64], *buf;
2031 u32 pr_aptpl_buf_len;
2032 int ret, clear_aptpl_metadata = 0;
2033 /*
2034 * Can be called with a NULL pointer from PROUT service action CLEAR
2035 */
2036 if (!(in_buf)) {
2037 memset(null_buf, 0, 64);
2038 buf = &null_buf[0];
2039 /*
2040 * This will clear the APTPL metadata to:
2041 * "No Registrations or Reservations" status
2042 */
2043 pr_aptpl_buf_len = 64;
2044 clear_aptpl_metadata = 1;
2045 } else {
2046 buf = in_buf;
2047 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2048 }
2049
2050 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2051 clear_aptpl_metadata);
2052 if (ret != 0)
2053 return -1;
2054 /*
2055 * __core_scsi3_write_aptpl_to_file() will call strlen()
2056 * on the passed buf to determine pr_aptpl_buf_len.
2057 */
2058 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2059 if (ret != 0)
2060 return -1;
2061
2062 return ret;
2063 }
2064
2065 static int core_scsi3_emulate_pro_register(
2066 struct se_cmd *cmd,
2067 u64 res_key,
2068 u64 sa_res_key,
2069 int aptpl,
2070 int all_tg_pt,
2071 int spec_i_pt,
2072 int ignore_key)
2073 {
2074 struct se_session *se_sess = SE_SESS(cmd);
2075 struct se_device *dev = SE_DEV(cmd);
2076 struct se_dev_entry *se_deve;
2077 struct se_lun *se_lun = SE_LUN(cmd);
2078 struct se_portal_group *se_tpg;
2079 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2080 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2081 /* Used for APTPL metadata w/ UNREGISTER */
2082 unsigned char *pr_aptpl_buf = NULL;
2083 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2084 int pr_holder = 0, ret = 0, type;
2085
2086 if (!(se_sess) || !(se_lun)) {
2087 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2088 return PYX_TRANSPORT_LU_COMM_FAILURE;
2089 }
2090 se_tpg = se_sess->se_tpg;
2091 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2092
2093 if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
2094 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2095 TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, &isid_buf[0],
2096 PR_REG_ISID_LEN);
2097 isid_ptr = &isid_buf[0];
2098 }
2099 /*
2100 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2101 */
2102 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2103 if (!(pr_reg_e)) {
2104 if (res_key) {
2105 printk(KERN_WARNING "SPC-3 PR: Reservation Key non-zero"
2106 " for SA REGISTER, returning CONFLICT\n");
2107 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2108 }
2109 /*
2110 * Do nothing but return GOOD status.
2111 */
2112 if (!(sa_res_key))
2113 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2114
2115 if (!(spec_i_pt)) {
2116 /*
2117 * Perform the Service Action REGISTER on the Initiator
2118 * Port Endpoint that the PRO was received from on the
2119 * Logical Unit of the SCSI device server.
2120 */
2121 ret = core_scsi3_alloc_registration(SE_DEV(cmd),
2122 se_sess->se_node_acl, se_deve, isid_ptr,
2123 sa_res_key, all_tg_pt, aptpl,
2124 ignore_key, 0);
2125 if (ret != 0) {
2126 printk(KERN_ERR "Unable to allocate"
2127 " struct t10_pr_registration\n");
2128 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2129 }
2130 } else {
2131 /*
2132 * Register both the Initiator port that received
2133 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2134 * TransportID from Parameter list and loop through
2135 * fabric dependent parameter list while calling
2136 * logic from of core_scsi3_alloc_registration() for
2137 * each TransportID provided SCSI Initiator Port/Device
2138 */
2139 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2140 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2141 if (ret != 0)
2142 return ret;
2143 }
2144 /*
2145 * Nothing left to do for the APTPL=0 case.
2146 */
2147 if (!(aptpl)) {
2148 pr_tmpl->pr_aptpl_active = 0;
2149 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
2150 printk("SPC-3 PR: Set APTPL Bit Deactivated for"
2151 " REGISTER\n");
2152 return 0;
2153 }
2154 /*
2155 * Locate the newly allocated local I_T Nexus *pr_reg, and
2156 * update the APTPL metadata information using its
2157 * preallocated *pr_reg->pr_aptpl_buf.
2158 */
2159 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd),
2160 se_sess->se_node_acl, se_sess);
2161
2162 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2163 &pr_reg->pr_aptpl_buf[0],
2164 pr_tmpl->pr_aptpl_buf_len);
2165 if (!(ret)) {
2166 pr_tmpl->pr_aptpl_active = 1;
2167 printk("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2168 }
2169
2170 core_scsi3_put_pr_reg(pr_reg);
2171 return ret;
2172 } else {
2173 /*
2174 * Locate the existing *pr_reg via struct se_node_acl pointers
2175 */
2176 pr_reg = pr_reg_e;
2177 type = pr_reg->pr_res_type;
2178
2179 if (!(ignore_key)) {
2180 if (res_key != pr_reg->pr_res_key) {
2181 printk(KERN_ERR "SPC-3 PR REGISTER: Received"
2182 " res_key: 0x%016Lx does not match"
2183 " existing SA REGISTER res_key:"
2184 " 0x%016Lx\n", res_key,
2185 pr_reg->pr_res_key);
2186 core_scsi3_put_pr_reg(pr_reg);
2187 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2188 }
2189 }
2190 if (spec_i_pt) {
2191 printk(KERN_ERR "SPC-3 PR UNREGISTER: SPEC_I_PT"
2192 " set while sa_res_key=0\n");
2193 core_scsi3_put_pr_reg(pr_reg);
2194 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2195 }
2196 /*
2197 * An existing ALL_TG_PT=1 registration being released
2198 * must also set ALL_TG_PT=1 in the incoming PROUT.
2199 */
2200 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2201 printk(KERN_ERR "SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2202 " registration exists, but ALL_TG_PT=1 bit not"
2203 " present in received PROUT\n");
2204 core_scsi3_put_pr_reg(pr_reg);
2205 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2206 }
2207 /*
2208 * Allocate APTPL metadata buffer used for UNREGISTER ops
2209 */
2210 if (aptpl) {
2211 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2212 GFP_KERNEL);
2213 if (!(pr_aptpl_buf)) {
2214 printk(KERN_ERR "Unable to allocate"
2215 " pr_aptpl_buf\n");
2216 core_scsi3_put_pr_reg(pr_reg);
2217 return PYX_TRANSPORT_LU_COMM_FAILURE;
2218 }
2219 }
2220 /*
2221 * sa_res_key=0 Unregister Reservation Key for registered I_T
2222 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2223 * Nexus.
2224 */
2225 if (!(sa_res_key)) {
2226 pr_holder = core_scsi3_check_implict_release(
2227 SE_DEV(cmd), pr_reg);
2228 if (pr_holder < 0) {
2229 kfree(pr_aptpl_buf);
2230 core_scsi3_put_pr_reg(pr_reg);
2231 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2232 }
2233
2234 spin_lock(&pr_tmpl->registration_lock);
2235 /*
2236 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2237 * and matching pr_res_key.
2238 */
2239 if (pr_reg->pr_reg_all_tg_pt) {
2240 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2241 &pr_tmpl->registration_list,
2242 pr_reg_list) {
2243
2244 if (!(pr_reg_p->pr_reg_all_tg_pt))
2245 continue;
2246
2247 if (pr_reg_p->pr_res_key != res_key)
2248 continue;
2249
2250 if (pr_reg == pr_reg_p)
2251 continue;
2252
2253 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2254 pr_reg_p->pr_reg_nacl->initiatorname))
2255 continue;
2256
2257 __core_scsi3_free_registration(dev,
2258 pr_reg_p, NULL, 0);
2259 }
2260 }
2261 /*
2262 * Release the calling I_T Nexus registration now..
2263 */
2264 __core_scsi3_free_registration(SE_DEV(cmd), pr_reg,
2265 NULL, 1);
2266 /*
2267 * From spc4r17, section 5.7.11.3 Unregistering
2268 *
2269 * If the persistent reservation is a registrants only
2270 * type, the device server shall establish a unit
2271 * attention condition for the initiator port associated
2272 * with every registered I_T nexus except for the I_T
2273 * nexus on which the PERSISTENT RESERVE OUT command was
2274 * received, with the additional sense code set to
2275 * RESERVATIONS RELEASED.
2276 */
2277 if (pr_holder &&
2278 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2279 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2280 list_for_each_entry(pr_reg_p,
2281 &pr_tmpl->registration_list,
2282 pr_reg_list) {
2283
2284 core_scsi3_ua_allocate(
2285 pr_reg_p->pr_reg_nacl,
2286 pr_reg_p->pr_res_mapped_lun,
2287 0x2A,
2288 ASCQ_2AH_RESERVATIONS_RELEASED);
2289 }
2290 }
2291 spin_unlock(&pr_tmpl->registration_lock);
2292
2293 if (!(aptpl)) {
2294 pr_tmpl->pr_aptpl_active = 0;
2295 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2296 printk("SPC-3 PR: Set APTPL Bit Deactivated"
2297 " for UNREGISTER\n");
2298 return 0;
2299 }
2300
2301 ret = core_scsi3_update_and_write_aptpl(dev,
2302 &pr_aptpl_buf[0],
2303 pr_tmpl->pr_aptpl_buf_len);
2304 if (!(ret)) {
2305 pr_tmpl->pr_aptpl_active = 1;
2306 printk("SPC-3 PR: Set APTPL Bit Activated"
2307 " for UNREGISTER\n");
2308 }
2309
2310 kfree(pr_aptpl_buf);
2311 return ret;
2312 } else {
2313 /*
2314 * Increment PRgeneration counter for struct se_device"
2315 * upon a successful REGISTER, see spc4r17 section 6.3.2
2316 * READ_KEYS service action.
2317 */
2318 pr_reg->pr_res_generation = core_scsi3_pr_generation(
2319 SE_DEV(cmd));
2320 pr_reg->pr_res_key = sa_res_key;
2321 printk("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2322 " Key for %s to: 0x%016Lx PRgeneration:"
2323 " 0x%08x\n", CMD_TFO(cmd)->get_fabric_name(),
2324 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2325 pr_reg->pr_reg_nacl->initiatorname,
2326 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2327
2328 if (!(aptpl)) {
2329 pr_tmpl->pr_aptpl_active = 0;
2330 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2331 core_scsi3_put_pr_reg(pr_reg);
2332 printk("SPC-3 PR: Set APTPL Bit Deactivated"
2333 " for REGISTER\n");
2334 return 0;
2335 }
2336
2337 ret = core_scsi3_update_and_write_aptpl(dev,
2338 &pr_aptpl_buf[0],
2339 pr_tmpl->pr_aptpl_buf_len);
2340 if (!(ret)) {
2341 pr_tmpl->pr_aptpl_active = 1;
2342 printk("SPC-3 PR: Set APTPL Bit Activated"
2343 " for REGISTER\n");
2344 }
2345
2346 kfree(pr_aptpl_buf);
2347 core_scsi3_put_pr_reg(pr_reg);
2348 }
2349 }
2350 return 0;
2351 }
2352
2353 unsigned char *core_scsi3_pr_dump_type(int type)
2354 {
2355 switch (type) {
2356 case PR_TYPE_WRITE_EXCLUSIVE:
2357 return "Write Exclusive Access";
2358 case PR_TYPE_EXCLUSIVE_ACCESS:
2359 return "Exclusive Access";
2360 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2361 return "Write Exclusive Access, Registrants Only";
2362 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2363 return "Exclusive Access, Registrants Only";
2364 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2365 return "Write Exclusive Access, All Registrants";
2366 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2367 return "Exclusive Access, All Registrants";
2368 default:
2369 break;
2370 }
2371
2372 return "Unknown SPC-3 PR Type";
2373 }
2374
2375 static int core_scsi3_pro_reserve(
2376 struct se_cmd *cmd,
2377 struct se_device *dev,
2378 int type,
2379 int scope,
2380 u64 res_key)
2381 {
2382 struct se_session *se_sess = SE_SESS(cmd);
2383 struct se_dev_entry *se_deve;
2384 struct se_lun *se_lun = SE_LUN(cmd);
2385 struct se_portal_group *se_tpg;
2386 struct t10_pr_registration *pr_reg, *pr_res_holder;
2387 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2388 char i_buf[PR_REG_ISID_ID_LEN];
2389 int ret, prf_isid;
2390
2391 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2392
2393 if (!(se_sess) || !(se_lun)) {
2394 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2395 return PYX_TRANSPORT_LU_COMM_FAILURE;
2396 }
2397 se_tpg = se_sess->se_tpg;
2398 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2399 /*
2400 * Locate the existing *pr_reg via struct se_node_acl pointers
2401 */
2402 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
2403 se_sess);
2404 if (!(pr_reg)) {
2405 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2406 " PR_REGISTERED *pr_reg for RESERVE\n");
2407 return PYX_TRANSPORT_LU_COMM_FAILURE;
2408 }
2409 /*
2410 * From spc4r17 Section 5.7.9: Reserving:
2411 *
2412 * An application client creates a persistent reservation by issuing
2413 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2414 * a registered I_T nexus with the following parameters:
2415 * a) RESERVATION KEY set to the value of the reservation key that is
2416 * registered with the logical unit for the I_T nexus; and
2417 */
2418 if (res_key != pr_reg->pr_res_key) {
2419 printk(KERN_ERR "SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2420 " does not match existing SA REGISTER res_key:"
2421 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2422 core_scsi3_put_pr_reg(pr_reg);
2423 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2424 }
2425 /*
2426 * From spc4r17 Section 5.7.9: Reserving:
2427 *
2428 * From above:
2429 * b) TYPE field and SCOPE field set to the persistent reservation
2430 * being created.
2431 *
2432 * Only one persistent reservation is allowed at a time per logical unit
2433 * and that persistent reservation has a scope of LU_SCOPE.
2434 */
2435 if (scope != PR_SCOPE_LU_SCOPE) {
2436 printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2437 core_scsi3_put_pr_reg(pr_reg);
2438 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2439 }
2440 /*
2441 * See if we have an existing PR reservation holder pointer at
2442 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2443 * *pr_res_holder.
2444 */
2445 spin_lock(&dev->dev_reservation_lock);
2446 pr_res_holder = dev->dev_pr_res_holder;
2447 if ((pr_res_holder)) {
2448 /*
2449 * From spc4r17 Section 5.7.9: Reserving:
2450 *
2451 * If the device server receives a PERSISTENT RESERVE OUT
2452 * command from an I_T nexus other than a persistent reservation
2453 * holder (see 5.7.10) that attempts to create a persistent
2454 * reservation when a persistent reservation already exists for
2455 * the logical unit, then the command shall be completed with
2456 * RESERVATION CONFLICT status.
2457 */
2458 if (pr_res_holder != pr_reg) {
2459 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2460 printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
2461 " [%s]: %s while reservation already held by"
2462 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2463 CMD_TFO(cmd)->get_fabric_name(),
2464 se_sess->se_node_acl->initiatorname,
2465 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2466 pr_res_holder->pr_reg_nacl->initiatorname);
2467
2468 spin_unlock(&dev->dev_reservation_lock);
2469 core_scsi3_put_pr_reg(pr_reg);
2470 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2471 }
2472 /*
2473 * From spc4r17 Section 5.7.9: Reserving:
2474 *
2475 * If a persistent reservation holder attempts to modify the
2476 * type or scope of an existing persistent reservation, the
2477 * command shall be completed with RESERVATION CONFLICT status.
2478 */
2479 if ((pr_res_holder->pr_res_type != type) ||
2480 (pr_res_holder->pr_res_scope != scope)) {
2481 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2482 printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
2483 " [%s]: %s trying to change TYPE and/or SCOPE,"
2484 " while reservation already held by [%s]: %s,"
2485 " returning RESERVATION_CONFLICT\n",
2486 CMD_TFO(cmd)->get_fabric_name(),
2487 se_sess->se_node_acl->initiatorname,
2488 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2489 pr_res_holder->pr_reg_nacl->initiatorname);
2490
2491 spin_unlock(&dev->dev_reservation_lock);
2492 core_scsi3_put_pr_reg(pr_reg);
2493 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2494 }
2495 /*
2496 * From spc4r17 Section 5.7.9: Reserving:
2497 *
2498 * If the device server receives a PERSISTENT RESERVE OUT
2499 * command with RESERVE service action where the TYPE field and
2500 * the SCOPE field contain the same values as the existing type
2501 * and scope from a persistent reservation holder, it shall not
2502 * make any change to the existing persistent reservation and
2503 * shall completethe command with GOOD status.
2504 */
2505 spin_unlock(&dev->dev_reservation_lock);
2506 core_scsi3_put_pr_reg(pr_reg);
2507 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2508 }
2509 /*
2510 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2511 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2512 */
2513 pr_reg->pr_res_scope = scope;
2514 pr_reg->pr_res_type = type;
2515 pr_reg->pr_res_holder = 1;
2516 dev->dev_pr_res_holder = pr_reg;
2517 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2518 PR_REG_ISID_ID_LEN);
2519
2520 printk(KERN_INFO "SPC-3 PR [%s] Service Action: RESERVE created new"
2521 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2522 CMD_TFO(cmd)->get_fabric_name(), core_scsi3_pr_dump_type(type),
2523 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2524 printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
2525 CMD_TFO(cmd)->get_fabric_name(),
2526 se_sess->se_node_acl->initiatorname,
2527 (prf_isid) ? &i_buf[0] : "");
2528 spin_unlock(&dev->dev_reservation_lock);
2529
2530 if (pr_tmpl->pr_aptpl_active) {
2531 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2532 &pr_reg->pr_aptpl_buf[0],
2533 pr_tmpl->pr_aptpl_buf_len);
2534 if (!(ret))
2535 printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
2536 " for RESERVE\n");
2537 }
2538
2539 core_scsi3_put_pr_reg(pr_reg);
2540 return 0;
2541 }
2542
2543 static int core_scsi3_emulate_pro_reserve(
2544 struct se_cmd *cmd,
2545 int type,
2546 int scope,
2547 u64 res_key)
2548 {
2549 struct se_device *dev = cmd->se_dev;
2550 int ret = 0;
2551
2552 switch (type) {
2553 case PR_TYPE_WRITE_EXCLUSIVE:
2554 case PR_TYPE_EXCLUSIVE_ACCESS:
2555 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2556 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2557 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2558 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2559 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2560 break;
2561 default:
2562 printk(KERN_ERR "SPC-3 PR: Unknown Service Action RESERVE Type:"
2563 " 0x%02x\n", type);
2564 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2565 }
2566
2567 return ret;
2568 }
2569
2570 /*
2571 * Called with struct se_device->dev_reservation_lock held.
2572 */
2573 static void __core_scsi3_complete_pro_release(
2574 struct se_device *dev,
2575 struct se_node_acl *se_nacl,
2576 struct t10_pr_registration *pr_reg,
2577 int explict)
2578 {
2579 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2580 char i_buf[PR_REG_ISID_ID_LEN];
2581 int prf_isid;
2582
2583 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2584 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2585 PR_REG_ISID_ID_LEN);
2586 /*
2587 * Go ahead and release the current PR reservation holder.
2588 */
2589 dev->dev_pr_res_holder = NULL;
2590
2591 printk(KERN_INFO "SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2592 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2593 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2594 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2595 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2596 printk(KERN_INFO "SPC-3 PR [%s] RELEASE Node: %s%s\n",
2597 tfo->get_fabric_name(), se_nacl->initiatorname,
2598 (prf_isid) ? &i_buf[0] : "");
2599 /*
2600 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2601 */
2602 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2603 }
2604
2605 static int core_scsi3_emulate_pro_release(
2606 struct se_cmd *cmd,
2607 int type,
2608 int scope,
2609 u64 res_key)
2610 {
2611 struct se_device *dev = cmd->se_dev;
2612 struct se_session *se_sess = SE_SESS(cmd);
2613 struct se_lun *se_lun = SE_LUN(cmd);
2614 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2615 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2616 int ret, all_reg = 0;
2617
2618 if (!(se_sess) || !(se_lun)) {
2619 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2620 return PYX_TRANSPORT_LU_COMM_FAILURE;
2621 }
2622 /*
2623 * Locate the existing *pr_reg via struct se_node_acl pointers
2624 */
2625 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2626 if (!(pr_reg)) {
2627 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2628 " PR_REGISTERED *pr_reg for RELEASE\n");
2629 return PYX_TRANSPORT_LU_COMM_FAILURE;
2630 }
2631 /*
2632 * From spc4r17 Section 5.7.11.2 Releasing:
2633 *
2634 * If there is no persistent reservation or in response to a persistent
2635 * reservation release request from a registered I_T nexus that is not a
2636 * persistent reservation holder (see 5.7.10), the device server shall
2637 * do the following:
2638 *
2639 * a) Not release the persistent reservation, if any;
2640 * b) Not remove any registrations; and
2641 * c) Complete the command with GOOD status.
2642 */
2643 spin_lock(&dev->dev_reservation_lock);
2644 pr_res_holder = dev->dev_pr_res_holder;
2645 if (!(pr_res_holder)) {
2646 /*
2647 * No persistent reservation, return GOOD status.
2648 */
2649 spin_unlock(&dev->dev_reservation_lock);
2650 core_scsi3_put_pr_reg(pr_reg);
2651 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2652 }
2653 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2654 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2655 all_reg = 1;
2656
2657 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2658 /*
2659 * Non 'All Registrants' PR Type cases..
2660 * Release request from a registered I_T nexus that is not a
2661 * persistent reservation holder. return GOOD status.
2662 */
2663 spin_unlock(&dev->dev_reservation_lock);
2664 core_scsi3_put_pr_reg(pr_reg);
2665 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2666 }
2667 /*
2668 * From spc4r17 Section 5.7.11.2 Releasing:
2669 *
2670 * Only the persistent reservation holder (see 5.7.10) is allowed to
2671 * release a persistent reservation.
2672 *
2673 * An application client releases the persistent reservation by issuing
2674 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2675 * an I_T nexus that is a persistent reservation holder with the
2676 * following parameters:
2677 *
2678 * a) RESERVATION KEY field set to the value of the reservation key
2679 * that is registered with the logical unit for the I_T nexus;
2680 */
2681 if (res_key != pr_reg->pr_res_key) {
2682 printk(KERN_ERR "SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2683 " does not match existing SA REGISTER res_key:"
2684 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2685 spin_unlock(&dev->dev_reservation_lock);
2686 core_scsi3_put_pr_reg(pr_reg);
2687 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2688 }
2689 /*
2690 * From spc4r17 Section 5.7.11.2 Releasing and above:
2691 *
2692 * b) TYPE field and SCOPE field set to match the persistent
2693 * reservation being released.
2694 */
2695 if ((pr_res_holder->pr_res_type != type) ||
2696 (pr_res_holder->pr_res_scope != scope)) {
2697 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2698 printk(KERN_ERR "SPC-3 PR RELEASE: Attempted to release"
2699 " reservation from [%s]: %s with different TYPE "
2700 "and/or SCOPE while reservation already held by"
2701 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2702 CMD_TFO(cmd)->get_fabric_name(),
2703 se_sess->se_node_acl->initiatorname,
2704 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2705 pr_res_holder->pr_reg_nacl->initiatorname);
2706
2707 spin_unlock(&dev->dev_reservation_lock);
2708 core_scsi3_put_pr_reg(pr_reg);
2709 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2710 }
2711 /*
2712 * In response to a persistent reservation release request from the
2713 * persistent reservation holder the device server shall perform a
2714 * release by doing the following as an uninterrupted series of actions:
2715 * a) Release the persistent reservation;
2716 * b) Not remove any registration(s);
2717 * c) If the released persistent reservation is a registrants only type
2718 * or all registrants type persistent reservation,
2719 * the device server shall establish a unit attention condition for
2720 * the initiator port associated with every regis-
2721 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2722 * RESERVE OUT command with RELEASE service action was received,
2723 * with the additional sense code set to RESERVATIONS RELEASED; and
2724 * d) If the persistent reservation is of any other type, the device
2725 * server shall not establish a unit attention condition.
2726 */
2727 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2728 pr_reg, 1);
2729
2730 spin_unlock(&dev->dev_reservation_lock);
2731
2732 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2733 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2734 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2735 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2736 /*
2737 * If no UNIT ATTENTION conditions will be established for
2738 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2739 * go ahead and check for APTPL=1 update+write below
2740 */
2741 goto write_aptpl;
2742 }
2743
2744 spin_lock(&pr_tmpl->registration_lock);
2745 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2746 pr_reg_list) {
2747 /*
2748 * Do not establish a UNIT ATTENTION condition
2749 * for the calling I_T Nexus
2750 */
2751 if (pr_reg_p == pr_reg)
2752 continue;
2753
2754 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2755 pr_reg_p->pr_res_mapped_lun,
2756 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2757 }
2758 spin_unlock(&pr_tmpl->registration_lock);
2759
2760 write_aptpl:
2761 if (pr_tmpl->pr_aptpl_active) {
2762 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2763 &pr_reg->pr_aptpl_buf[0],
2764 pr_tmpl->pr_aptpl_buf_len);
2765 if (!(ret))
2766 printk("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2767 }
2768
2769 core_scsi3_put_pr_reg(pr_reg);
2770 return 0;
2771 }
2772
2773 static int core_scsi3_emulate_pro_clear(
2774 struct se_cmd *cmd,
2775 u64 res_key)
2776 {
2777 struct se_device *dev = cmd->se_dev;
2778 struct se_node_acl *pr_reg_nacl;
2779 struct se_session *se_sess = SE_SESS(cmd);
2780 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2781 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2782 u32 pr_res_mapped_lun = 0;
2783 int calling_it_nexus = 0;
2784 /*
2785 * Locate the existing *pr_reg via struct se_node_acl pointers
2786 */
2787 pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd),
2788 se_sess->se_node_acl, se_sess);
2789 if (!(pr_reg_n)) {
2790 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2791 " PR_REGISTERED *pr_reg for CLEAR\n");
2792 return PYX_TRANSPORT_LU_COMM_FAILURE;
2793 }
2794 /*
2795 * From spc4r17 section 5.7.11.6, Clearing:
2796 *
2797 * Any application client may release the persistent reservation and
2798 * remove all registrations from a device server by issuing a
2799 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2800 * registered I_T nexus with the following parameter:
2801 *
2802 * a) RESERVATION KEY field set to the value of the reservation key
2803 * that is registered with the logical unit for the I_T nexus.
2804 */
2805 if (res_key != pr_reg_n->pr_res_key) {
2806 printk(KERN_ERR "SPC-3 PR REGISTER: Received"
2807 " res_key: 0x%016Lx does not match"
2808 " existing SA REGISTER res_key:"
2809 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2810 core_scsi3_put_pr_reg(pr_reg_n);
2811 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2812 }
2813 /*
2814 * a) Release the persistent reservation, if any;
2815 */
2816 spin_lock(&dev->dev_reservation_lock);
2817 pr_res_holder = dev->dev_pr_res_holder;
2818 if (pr_res_holder) {
2819 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2820 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2821 pr_res_holder, 0);
2822 }
2823 spin_unlock(&dev->dev_reservation_lock);
2824 /*
2825 * b) Remove all registration(s) (see spc4r17 5.7.7);
2826 */
2827 spin_lock(&pr_tmpl->registration_lock);
2828 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2829 &pr_tmpl->registration_list, pr_reg_list) {
2830
2831 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2832 pr_reg_nacl = pr_reg->pr_reg_nacl;
2833 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2834 __core_scsi3_free_registration(dev, pr_reg, NULL,
2835 calling_it_nexus);
2836 /*
2837 * e) Establish a unit attention condition for the initiator
2838 * port associated with every registered I_T nexus other
2839 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2840 * command with CLEAR service action was received, with the
2841 * additional sense code set to RESERVATIONS PREEMPTED.
2842 */
2843 if (!(calling_it_nexus))
2844 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2845 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2846 }
2847 spin_unlock(&pr_tmpl->registration_lock);
2848
2849 printk(KERN_INFO "SPC-3 PR [%s] Service Action: CLEAR complete\n",
2850 CMD_TFO(cmd)->get_fabric_name());
2851
2852 if (pr_tmpl->pr_aptpl_active) {
2853 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
2854 printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
2855 " for CLEAR\n");
2856 }
2857
2858 core_scsi3_pr_generation(dev);
2859 return 0;
2860 }
2861
2862 /*
2863 * Called with struct se_device->dev_reservation_lock held.
2864 */
2865 static void __core_scsi3_complete_pro_preempt(
2866 struct se_device *dev,
2867 struct t10_pr_registration *pr_reg,
2868 struct list_head *preempt_and_abort_list,
2869 int type,
2870 int scope,
2871 int abort)
2872 {
2873 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2874 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2875 char i_buf[PR_REG_ISID_ID_LEN];
2876 int prf_isid;
2877
2878 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2879 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2880 PR_REG_ISID_ID_LEN);
2881 /*
2882 * Do an implict RELEASE of the existing reservation.
2883 */
2884 if (dev->dev_pr_res_holder)
2885 __core_scsi3_complete_pro_release(dev, nacl,
2886 dev->dev_pr_res_holder, 0);
2887
2888 dev->dev_pr_res_holder = pr_reg;
2889 pr_reg->pr_res_holder = 1;
2890 pr_reg->pr_res_type = type;
2891 pr_reg->pr_res_scope = scope;
2892
2893 printk(KERN_INFO "SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2894 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2895 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2896 core_scsi3_pr_dump_type(type),
2897 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2898 printk(KERN_INFO "SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2899 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2900 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2901 /*
2902 * For PREEMPT_AND_ABORT, add the preempting reservation's
2903 * struct t10_pr_registration to the list that will be compared
2904 * against received CDBs..
2905 */
2906 if (preempt_and_abort_list)
2907 list_add_tail(&pr_reg->pr_reg_abort_list,
2908 preempt_and_abort_list);
2909 }
2910
2911 static void core_scsi3_release_preempt_and_abort(
2912 struct list_head *preempt_and_abort_list,
2913 struct t10_pr_registration *pr_reg_holder)
2914 {
2915 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2916
2917 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2918 pr_reg_abort_list) {
2919
2920 list_del(&pr_reg->pr_reg_abort_list);
2921 if (pr_reg_holder == pr_reg)
2922 continue;
2923 if (pr_reg->pr_res_holder) {
2924 printk(KERN_WARNING "pr_reg->pr_res_holder still set\n");
2925 continue;
2926 }
2927
2928 pr_reg->pr_reg_deve = NULL;
2929 pr_reg->pr_reg_nacl = NULL;
2930 kfree(pr_reg->pr_aptpl_buf);
2931 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2932 }
2933 }
2934
2935 int core_scsi3_check_cdb_abort_and_preempt(
2936 struct list_head *preempt_and_abort_list,
2937 struct se_cmd *cmd)
2938 {
2939 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2940
2941 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2942 pr_reg_abort_list) {
2943 if (pr_reg->pr_res_key == cmd->pr_res_key)
2944 return 0;
2945 }
2946
2947 return 1;
2948 }
2949
2950 static int core_scsi3_pro_preempt(
2951 struct se_cmd *cmd,
2952 int type,
2953 int scope,
2954 u64 res_key,
2955 u64 sa_res_key,
2956 int abort)
2957 {
2958 struct se_device *dev = SE_DEV(cmd);
2959 struct se_dev_entry *se_deve;
2960 struct se_node_acl *pr_reg_nacl;
2961 struct se_session *se_sess = SE_SESS(cmd);
2962 struct list_head preempt_and_abort_list;
2963 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2964 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2965 u32 pr_res_mapped_lun = 0;
2966 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2967 int prh_type = 0, prh_scope = 0, ret;
2968
2969 if (!(se_sess))
2970 return PYX_TRANSPORT_LU_COMM_FAILURE;
2971
2972 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2973 pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
2974 se_sess);
2975 if (!(pr_reg_n)) {
2976 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2977 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2978 (abort) ? "_AND_ABORT" : "");
2979 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2980 }
2981 if (pr_reg_n->pr_res_key != res_key) {
2982 core_scsi3_put_pr_reg(pr_reg_n);
2983 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2984 }
2985 if (scope != PR_SCOPE_LU_SCOPE) {
2986 printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2987 core_scsi3_put_pr_reg(pr_reg_n);
2988 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2989 }
2990 INIT_LIST_HEAD(&preempt_and_abort_list);
2991
2992 spin_lock(&dev->dev_reservation_lock);
2993 pr_res_holder = dev->dev_pr_res_holder;
2994 if (pr_res_holder &&
2995 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2996 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2997 all_reg = 1;
2998
2999 if (!(all_reg) && !(sa_res_key)) {
3000 spin_unlock(&dev->dev_reservation_lock);
3001 core_scsi3_put_pr_reg(pr_reg_n);
3002 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3003 }
3004 /*
3005 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3006 *
3007 * If the SERVICE ACTION RESERVATION KEY field does not identify a
3008 * persistent reservation holder or there is no persistent reservation
3009 * holder (i.e., there is no persistent reservation), then the device
3010 * server shall perform a preempt by doing the following in an
3011 * uninterrupted series of actions. (See below..)
3012 */
3013 if (!(pr_res_holder) || (pr_res_holder->pr_res_key != sa_res_key)) {
3014 /*
3015 * No existing or SA Reservation Key matching reservations..
3016 *
3017 * PROUT SA PREEMPT with All Registrant type reservations are
3018 * allowed to be processed without a matching SA Reservation Key
3019 */
3020 spin_lock(&pr_tmpl->registration_lock);
3021 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3022 &pr_tmpl->registration_list, pr_reg_list) {
3023 /*
3024 * Removing of registrations in non all registrants
3025 * type reservations without a matching SA reservation
3026 * key.
3027 *
3028 * a) Remove the registrations for all I_T nexuses
3029 * specified by the SERVICE ACTION RESERVATION KEY
3030 * field;
3031 * b) Ignore the contents of the SCOPE and TYPE fields;
3032 * c) Process tasks as defined in 5.7.1; and
3033 * d) Establish a unit attention condition for the
3034 * initiator port associated with every I_T nexus
3035 * that lost its registration other than the I_T
3036 * nexus on which the PERSISTENT RESERVE OUT command
3037 * was received, with the additional sense code set
3038 * to REGISTRATIONS PREEMPTED.
3039 */
3040 if (!(all_reg)) {
3041 if (pr_reg->pr_res_key != sa_res_key)
3042 continue;
3043
3044 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3045 pr_reg_nacl = pr_reg->pr_reg_nacl;
3046 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3047 __core_scsi3_free_registration(dev, pr_reg,
3048 (abort) ? &preempt_and_abort_list :
3049 NULL, calling_it_nexus);
3050 released_regs++;
3051 } else {
3052 /*
3053 * Case for any existing all registrants type
3054 * reservation, follow logic in spc4r17 section
3055 * 5.7.11.4 Preempting, Table 52 and Figure 7.
3056 *
3057 * For a ZERO SA Reservation key, release
3058 * all other registrations and do an implict
3059 * release of active persistent reservation.
3060 *
3061 * For a non-ZERO SA Reservation key, only
3062 * release the matching reservation key from
3063 * registrations.
3064 */
3065 if ((sa_res_key) &&
3066 (pr_reg->pr_res_key != sa_res_key))
3067 continue;
3068
3069 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3070 if (calling_it_nexus)
3071 continue;
3072
3073 pr_reg_nacl = pr_reg->pr_reg_nacl;
3074 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3075 __core_scsi3_free_registration(dev, pr_reg,
3076 (abort) ? &preempt_and_abort_list :
3077 NULL, 0);
3078 released_regs++;
3079 }
3080 if (!(calling_it_nexus))
3081 core_scsi3_ua_allocate(pr_reg_nacl,
3082 pr_res_mapped_lun, 0x2A,
3083 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3084 }
3085 spin_unlock(&pr_tmpl->registration_lock);
3086 /*
3087 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3088 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3089 * RESERVATION KEY field to a value that does not match any
3090 * registered reservation key, then the device server shall
3091 * complete the command with RESERVATION CONFLICT status.
3092 */
3093 if (!(released_regs)) {
3094 spin_unlock(&dev->dev_reservation_lock);
3095 core_scsi3_put_pr_reg(pr_reg_n);
3096 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3097 }
3098 /*
3099 * For an existing all registrants type reservation
3100 * with a zero SA rservation key, preempt the existing
3101 * reservation with the new PR type and scope.
3102 */
3103 if (pr_res_holder && all_reg && !(sa_res_key)) {
3104 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3105 (abort) ? &preempt_and_abort_list : NULL,
3106 type, scope, abort);
3107
3108 if (abort)
3109 core_scsi3_release_preempt_and_abort(
3110 &preempt_and_abort_list, pr_reg_n);
3111 }
3112 spin_unlock(&dev->dev_reservation_lock);
3113
3114 if (pr_tmpl->pr_aptpl_active) {
3115 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3116 &pr_reg_n->pr_aptpl_buf[0],
3117 pr_tmpl->pr_aptpl_buf_len);
3118 if (!(ret))
3119 printk(KERN_INFO "SPC-3 PR: Updated APTPL"
3120 " metadata for PREEMPT%s\n", (abort) ?
3121 "_AND_ABORT" : "");
3122 }
3123
3124 core_scsi3_put_pr_reg(pr_reg_n);
3125 core_scsi3_pr_generation(SE_DEV(cmd));
3126 return 0;
3127 }
3128 /*
3129 * The PREEMPTing SA reservation key matches that of the
3130 * existing persistent reservation, first, we check if
3131 * we are preempting our own reservation.
3132 * From spc4r17, section 5.7.11.4.3 Preempting
3133 * persistent reservations and registration handling
3134 *
3135 * If an all registrants persistent reservation is not
3136 * present, it is not an error for the persistent
3137 * reservation holder to preempt itself (i.e., a
3138 * PERSISTENT RESERVE OUT with a PREEMPT service action
3139 * or a PREEMPT AND ABORT service action with the
3140 * SERVICE ACTION RESERVATION KEY value equal to the
3141 * persistent reservation holder's reservation key that
3142 * is received from the persistent reservation holder).
3143 * In that case, the device server shall establish the
3144 * new persistent reservation and maintain the
3145 * registration.
3146 */
3147 prh_type = pr_res_holder->pr_res_type;
3148 prh_scope = pr_res_holder->pr_res_scope;
3149 /*
3150 * If the SERVICE ACTION RESERVATION KEY field identifies a
3151 * persistent reservation holder (see 5.7.10), the device
3152 * server shall perform a preempt by doing the following as
3153 * an uninterrupted series of actions:
3154 *
3155 * a) Release the persistent reservation for the holder
3156 * identified by the SERVICE ACTION RESERVATION KEY field;
3157 */
3158 if (pr_reg_n != pr_res_holder)
3159 __core_scsi3_complete_pro_release(dev,
3160 pr_res_holder->pr_reg_nacl,
3161 dev->dev_pr_res_holder, 0);
3162 /*
3163 * b) Remove the registrations for all I_T nexuses identified
3164 * by the SERVICE ACTION RESERVATION KEY field, except the
3165 * I_T nexus that is being used for the PERSISTENT RESERVE
3166 * OUT command. If an all registrants persistent reservation
3167 * is present and the SERVICE ACTION RESERVATION KEY field
3168 * is set to zero, then all registrations shall be removed
3169 * except for that of the I_T nexus that is being used for
3170 * the PERSISTENT RESERVE OUT command;
3171 */
3172 spin_lock(&pr_tmpl->registration_lock);
3173 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3174 &pr_tmpl->registration_list, pr_reg_list) {
3175
3176 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3177 if (calling_it_nexus)
3178 continue;
3179
3180 if (pr_reg->pr_res_key != sa_res_key)
3181 continue;
3182
3183 pr_reg_nacl = pr_reg->pr_reg_nacl;
3184 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3185 __core_scsi3_free_registration(dev, pr_reg,
3186 (abort) ? &preempt_and_abort_list : NULL,
3187 calling_it_nexus);
3188 /*
3189 * e) Establish a unit attention condition for the initiator
3190 * port associated with every I_T nexus that lost its
3191 * persistent reservation and/or registration, with the
3192 * additional sense code set to REGISTRATIONS PREEMPTED;
3193 */
3194 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3195 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3196 }
3197 spin_unlock(&pr_tmpl->registration_lock);
3198 /*
3199 * c) Establish a persistent reservation for the preempting
3200 * I_T nexus using the contents of the SCOPE and TYPE fields;
3201 */
3202 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3203 (abort) ? &preempt_and_abort_list : NULL,
3204 type, scope, abort);
3205 /*
3206 * d) Process tasks as defined in 5.7.1;
3207 * e) See above..
3208 * f) If the type or scope has changed, then for every I_T nexus
3209 * whose reservation key was not removed, except for the I_T
3210 * nexus on which the PERSISTENT RESERVE OUT command was
3211 * received, the device server shall establish a unit
3212 * attention condition for the initiator port associated with
3213 * that I_T nexus, with the additional sense code set to
3214 * RESERVATIONS RELEASED. If the type or scope have not
3215 * changed, then no unit attention condition(s) shall be
3216 * established for this reason.
3217 */
3218 if ((prh_type != type) || (prh_scope != scope)) {
3219 spin_lock(&pr_tmpl->registration_lock);
3220 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3221 &pr_tmpl->registration_list, pr_reg_list) {
3222
3223 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3224 if (calling_it_nexus)
3225 continue;
3226
3227 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3228 pr_reg->pr_res_mapped_lun, 0x2A,
3229 ASCQ_2AH_RESERVATIONS_RELEASED);
3230 }
3231 spin_unlock(&pr_tmpl->registration_lock);
3232 }
3233 spin_unlock(&dev->dev_reservation_lock);
3234 /*
3235 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3236 * All received CDBs for the matching existing reservation and
3237 * registrations undergo ABORT_TASK logic.
3238 *
3239 * From there, core_scsi3_release_preempt_and_abort() will
3240 * release every registration in the list (which have already
3241 * been removed from the primary pr_reg list), except the
3242 * new persistent reservation holder, the calling Initiator Port.
3243 */
3244 if (abort) {
3245 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3246 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3247 pr_reg_n);
3248 }
3249
3250 if (pr_tmpl->pr_aptpl_active) {
3251 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3252 &pr_reg_n->pr_aptpl_buf[0],
3253 pr_tmpl->pr_aptpl_buf_len);
3254 if (!(ret))
3255 printk("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3256 "%s\n", (abort) ? "_AND_ABORT" : "");
3257 }
3258
3259 core_scsi3_put_pr_reg(pr_reg_n);
3260 core_scsi3_pr_generation(SE_DEV(cmd));
3261 return 0;
3262 }
3263
3264 static int core_scsi3_emulate_pro_preempt(
3265 struct se_cmd *cmd,
3266 int type,
3267 int scope,
3268 u64 res_key,
3269 u64 sa_res_key,
3270 int abort)
3271 {
3272 int ret = 0;
3273
3274 switch (type) {
3275 case PR_TYPE_WRITE_EXCLUSIVE:
3276 case PR_TYPE_EXCLUSIVE_ACCESS:
3277 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3278 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3279 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3280 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3281 ret = core_scsi3_pro_preempt(cmd, type, scope,
3282 res_key, sa_res_key, abort);
3283 break;
3284 default:
3285 printk(KERN_ERR "SPC-3 PR: Unknown Service Action PREEMPT%s"
3286 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3287 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3288 }
3289
3290 return ret;
3291 }
3292
3293
3294 static int core_scsi3_emulate_pro_register_and_move(
3295 struct se_cmd *cmd,
3296 u64 res_key,
3297 u64 sa_res_key,
3298 int aptpl,
3299 int unreg)
3300 {
3301 struct se_session *se_sess = SE_SESS(cmd);
3302 struct se_device *dev = SE_DEV(cmd);
3303 struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3304 struct se_lun *se_lun = SE_LUN(cmd);
3305 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3306 struct se_port *se_port;
3307 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3308 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3309 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3310 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
3311 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3312 unsigned char *initiator_str;
3313 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3314 u32 tid_len, tmp_tid_len;
3315 int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3316 unsigned short rtpi;
3317 unsigned char proto_ident;
3318
3319 if (!(se_sess) || !(se_lun)) {
3320 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3321 return PYX_TRANSPORT_LU_COMM_FAILURE;
3322 }
3323 memset(dest_iport, 0, 64);
3324 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3325 se_tpg = se_sess->se_tpg;
3326 tf_ops = TPG_TFO(se_tpg);
3327 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3328 /*
3329 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3330 * Register behaviors for a REGISTER AND MOVE service action
3331 *
3332 * Locate the existing *pr_reg via struct se_node_acl pointers
3333 */
3334 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
3335 se_sess);
3336 if (!(pr_reg)) {
3337 printk(KERN_ERR "SPC-3 PR: Unable to locate PR_REGISTERED"
3338 " *pr_reg for REGISTER_AND_MOVE\n");
3339 return PYX_TRANSPORT_LU_COMM_FAILURE;
3340 }
3341 /*
3342 * The provided reservation key much match the existing reservation key
3343 * provided during this initiator's I_T nexus registration.
3344 */
3345 if (res_key != pr_reg->pr_res_key) {
3346 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received"
3347 " res_key: 0x%016Lx does not match existing SA REGISTER"
3348 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3349 core_scsi3_put_pr_reg(pr_reg);
3350 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3351 }
3352 /*
3353 * The service active reservation key needs to be non zero
3354 */
3355 if (!(sa_res_key)) {
3356 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received zero"
3357 " sa_res_key\n");
3358 core_scsi3_put_pr_reg(pr_reg);
3359 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3360 }
3361 /*
3362 * Determine the Relative Target Port Identifier where the reservation
3363 * will be moved to for the TransportID containing SCSI initiator WWN
3364 * information.
3365 */
3366 rtpi = (buf[18] & 0xff) << 8;
3367 rtpi |= buf[19] & 0xff;
3368 tid_len = (buf[20] & 0xff) << 24;
3369 tid_len |= (buf[21] & 0xff) << 16;
3370 tid_len |= (buf[22] & 0xff) << 8;
3371 tid_len |= buf[23] & 0xff;
3372
3373 if ((tid_len + 24) != cmd->data_length) {
3374 printk(KERN_ERR "SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3375 " does not equal CDB data_length: %u\n", tid_len,
3376 cmd->data_length);
3377 core_scsi3_put_pr_reg(pr_reg);
3378 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3379 }
3380
3381 spin_lock(&dev->se_port_lock);
3382 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3383 if (se_port->sep_rtpi != rtpi)
3384 continue;
3385 dest_se_tpg = se_port->sep_tpg;
3386 if (!(dest_se_tpg))
3387 continue;
3388 dest_tf_ops = TPG_TFO(dest_se_tpg);
3389 if (!(dest_tf_ops))
3390 continue;
3391
3392 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3393 smp_mb__after_atomic_inc();
3394 spin_unlock(&dev->se_port_lock);
3395
3396 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3397 if (ret != 0) {
3398 printk(KERN_ERR "core_scsi3_tpg_depend_item() failed"
3399 " for dest_se_tpg\n");
3400 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3401 smp_mb__after_atomic_dec();
3402 core_scsi3_put_pr_reg(pr_reg);
3403 return PYX_TRANSPORT_LU_COMM_FAILURE;
3404 }
3405
3406 spin_lock(&dev->se_port_lock);
3407 break;
3408 }
3409 spin_unlock(&dev->se_port_lock);
3410
3411 if (!(dest_se_tpg) || (!dest_tf_ops)) {
3412 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3413 " fabric ops from Relative Target Port Identifier:"
3414 " %hu\n", rtpi);
3415 core_scsi3_put_pr_reg(pr_reg);
3416 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3417 }
3418 proto_ident = (buf[24] & 0x0f);
3419 #if 0
3420 printk("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3421 " 0x%02x\n", proto_ident);
3422 #endif
3423 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3424 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Received"
3425 " proto_ident: 0x%02x does not match ident: 0x%02x"
3426 " from fabric: %s\n", proto_ident,
3427 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3428 dest_tf_ops->get_fabric_name());
3429 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3430 goto out;
3431 }
3432 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3433 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3434 " containg a valid tpg_parse_pr_out_transport_id"
3435 " function pointer\n");
3436 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3437 goto out;
3438 }
3439 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3440 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3441 if (!(initiator_str)) {
3442 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3443 " initiator_str from Transport ID\n");
3444 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3445 goto out;
3446 }
3447
3448 printk(KERN_INFO "SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3449 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3450 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3451 iport_ptr : "");
3452 /*
3453 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3454 * action specifies a TransportID that is the same as the initiator port
3455 * of the I_T nexus for the command received, then the command shall
3456 * be terminated with CHECK CONDITION status, with the sense key set to
3457 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3458 * IN PARAMETER LIST.
3459 */
3460 pr_reg_nacl = pr_reg->pr_reg_nacl;
3461 matching_iname = (!strcmp(initiator_str,
3462 pr_reg_nacl->initiatorname)) ? 1 : 0;
3463 if (!(matching_iname))
3464 goto after_iport_check;
3465
3466 if (!(iport_ptr) || !(pr_reg->isid_present_at_reg)) {
3467 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3468 " matches: %s on received I_T Nexus\n", initiator_str,
3469 pr_reg_nacl->initiatorname);
3470 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3471 goto out;
3472 }
3473 if (!(strcmp(iport_ptr, pr_reg->pr_reg_isid))) {
3474 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3475 " matches: %s %s on received I_T Nexus\n",
3476 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3477 pr_reg->pr_reg_isid);
3478 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3479 goto out;
3480 }
3481 after_iport_check:
3482 /*
3483 * Locate the destination struct se_node_acl from the received Transport ID
3484 */
3485 spin_lock_bh(&dest_se_tpg->acl_node_lock);
3486 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3487 initiator_str);
3488 if (dest_node_acl) {
3489 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3490 smp_mb__after_atomic_inc();
3491 }
3492 spin_unlock_bh(&dest_se_tpg->acl_node_lock);
3493
3494 if (!(dest_node_acl)) {
3495 printk(KERN_ERR "Unable to locate %s dest_node_acl for"
3496 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3497 initiator_str);
3498 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3499 goto out;
3500 }
3501 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3502 if (ret != 0) {
3503 printk(KERN_ERR "core_scsi3_nodeacl_depend_item() for"
3504 " dest_node_acl\n");
3505 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3506 smp_mb__after_atomic_dec();
3507 dest_node_acl = NULL;
3508 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3509 goto out;
3510 }
3511 #if 0
3512 printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3513 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3514 dest_node_acl->initiatorname);
3515 #endif
3516 /*
3517 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3518 * PORT IDENTIFIER.
3519 */
3520 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3521 if (!(dest_se_deve)) {
3522 printk(KERN_ERR "Unable to locate %s dest_se_deve from RTPI:"
3523 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3524 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3525 goto out;
3526 }
3527
3528 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3529 if (ret < 0) {
3530 printk(KERN_ERR "core_scsi3_lunacl_depend_item() failed\n");
3531 atomic_dec(&dest_se_deve->pr_ref_count);
3532 smp_mb__after_atomic_dec();
3533 dest_se_deve = NULL;
3534 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3535 goto out;
3536 }
3537 #if 0
3538 printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3539 " ACL for dest_se_deve->mapped_lun: %u\n",
3540 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3541 dest_se_deve->mapped_lun);
3542 #endif
3543 /*
3544 * A persistent reservation needs to already existing in order to
3545 * successfully complete the REGISTER_AND_MOVE service action..
3546 */
3547 spin_lock(&dev->dev_reservation_lock);
3548 pr_res_holder = dev->dev_pr_res_holder;
3549 if (!(pr_res_holder)) {
3550 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: No reservation"
3551 " currently held\n");
3552 spin_unlock(&dev->dev_reservation_lock);
3553 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3554 goto out;
3555 }
3556 /*
3557 * The received on I_T Nexus must be the reservation holder.
3558 *
3559 * From spc4r17 section 5.7.8 Table 50 --
3560 * Register behaviors for a REGISTER AND MOVE service action
3561 */
3562 if (pr_res_holder != pr_reg) {
3563 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3564 " Nexus is not reservation holder\n");
3565 spin_unlock(&dev->dev_reservation_lock);
3566 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3567 goto out;
3568 }
3569 /*
3570 * From spc4r17 section 5.7.8: registering and moving reservation
3571 *
3572 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3573 * action is received and the established persistent reservation is a
3574 * Write Exclusive - All Registrants type or Exclusive Access -
3575 * All Registrants type reservation, then the command shall be completed
3576 * with RESERVATION CONFLICT status.
3577 */
3578 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3579 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3580 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3581 " reservation for type: %s\n",
3582 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3583 spin_unlock(&dev->dev_reservation_lock);
3584 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3585 goto out;
3586 }
3587 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3588 /*
3589 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3590 */
3591 type = pr_res_holder->pr_res_type;
3592 scope = pr_res_holder->pr_res_type;
3593 /*
3594 * c) Associate the reservation key specified in the SERVICE ACTION
3595 * RESERVATION KEY field with the I_T nexus specified as the
3596 * destination of the register and move, where:
3597 * A) The I_T nexus is specified by the TransportID and the
3598 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3599 * B) Regardless of the TransportID format used, the association for
3600 * the initiator port is based on either the initiator port name
3601 * (see 3.1.71) on SCSI transport protocols where port names are
3602 * required or the initiator port identifier (see 3.1.70) on SCSI
3603 * transport protocols where port names are not required;
3604 * d) Register the reservation key specified in the SERVICE ACTION
3605 * RESERVATION KEY field;
3606 * e) Retain the reservation key specified in the SERVICE ACTION
3607 * RESERVATION KEY field and associated information;
3608 *
3609 * Also, It is not an error for a REGISTER AND MOVE service action to
3610 * register an I_T nexus that is already registered with the same
3611 * reservation key or a different reservation key.
3612 */
3613 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3614 iport_ptr);
3615 if (!(dest_pr_reg)) {
3616 ret = core_scsi3_alloc_registration(SE_DEV(cmd),
3617 dest_node_acl, dest_se_deve, iport_ptr,
3618 sa_res_key, 0, aptpl, 2, 1);
3619 if (ret != 0) {
3620 spin_unlock(&dev->dev_reservation_lock);
3621 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3622 goto out;
3623 }
3624 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3625 iport_ptr);
3626 new_reg = 1;
3627 }
3628 /*
3629 * f) Release the persistent reservation for the persistent reservation
3630 * holder (i.e., the I_T nexus on which the
3631 */
3632 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3633 dev->dev_pr_res_holder, 0);
3634 /*
3635 * g) Move the persistent reservation to the specified I_T nexus using
3636 * the same scope and type as the persistent reservation released in
3637 * item f); and
3638 */
3639 dev->dev_pr_res_holder = dest_pr_reg;
3640 dest_pr_reg->pr_res_holder = 1;
3641 dest_pr_reg->pr_res_type = type;
3642 pr_reg->pr_res_scope = scope;
3643 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3644 PR_REG_ISID_ID_LEN);
3645 /*
3646 * Increment PRGeneration for existing registrations..
3647 */
3648 if (!(new_reg))
3649 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3650 spin_unlock(&dev->dev_reservation_lock);
3651
3652 printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3653 " created new reservation holder TYPE: %s on object RTPI:"
3654 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3655 core_scsi3_pr_dump_type(type), rtpi,
3656 dest_pr_reg->pr_res_generation);
3657 printk(KERN_INFO "SPC-3 PR Successfully moved reservation from"
3658 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3659 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3660 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3661 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3662 iport_ptr : "");
3663 /*
3664 * It is now safe to release configfs group dependencies for destination
3665 * of Transport ID Initiator Device/Port Identifier
3666 */
3667 core_scsi3_lunacl_undepend_item(dest_se_deve);
3668 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3669 core_scsi3_tpg_undepend_item(dest_se_tpg);
3670 /*
3671 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3672 * nexus on which PERSISTENT RESERVE OUT command was received.
3673 */
3674 if (unreg) {
3675 spin_lock(&pr_tmpl->registration_lock);
3676 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3677 spin_unlock(&pr_tmpl->registration_lock);
3678 } else
3679 core_scsi3_put_pr_reg(pr_reg);
3680
3681 /*
3682 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3683 * write out the updated metadata to struct file for this SCSI device.
3684 */
3685 if (!(aptpl)) {
3686 pr_tmpl->pr_aptpl_active = 0;
3687 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
3688 printk("SPC-3 PR: Set APTPL Bit Deactivated for"
3689 " REGISTER_AND_MOVE\n");
3690 } else {
3691 pr_tmpl->pr_aptpl_active = 1;
3692 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3693 &dest_pr_reg->pr_aptpl_buf[0],
3694 pr_tmpl->pr_aptpl_buf_len);
3695 if (!(ret))
3696 printk("SPC-3 PR: Set APTPL Bit Activated for"
3697 " REGISTER_AND_MOVE\n");
3698 }
3699
3700 core_scsi3_put_pr_reg(dest_pr_reg);
3701 return 0;
3702 out:
3703 if (dest_se_deve)
3704 core_scsi3_lunacl_undepend_item(dest_se_deve);
3705 if (dest_node_acl)
3706 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3707 core_scsi3_tpg_undepend_item(dest_se_tpg);
3708 core_scsi3_put_pr_reg(pr_reg);
3709 return ret;
3710 }
3711
3712 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3713 {
3714 unsigned int __v1, __v2;
3715
3716 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3717 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3718
3719 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3720 }
3721
3722 /*
3723 * See spc4r17 section 6.14 Table 170
3724 */
3725 static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
3726 {
3727 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3728 u64 res_key, sa_res_key;
3729 int sa, scope, type, aptpl;
3730 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3731 /*
3732 * FIXME: A NULL struct se_session pointer means an this is not coming from
3733 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3734 */
3735 if (!(SE_SESS(cmd)))
3736 return PYX_TRANSPORT_LU_COMM_FAILURE;
3737
3738 if (cmd->data_length < 24) {
3739 printk(KERN_WARNING "SPC-PR: Received PR OUT parameter list"
3740 " length too small: %u\n", cmd->data_length);
3741 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3742 }
3743 /*
3744 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3745 */
3746 sa = (cdb[1] & 0x1f);
3747 scope = (cdb[2] & 0xf0);
3748 type = (cdb[2] & 0x0f);
3749 /*
3750 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3751 */
3752 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3753 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3754 /*
3755 * REGISTER_AND_MOVE uses a different SA parameter list containing
3756 * SCSI TransportIDs.
3757 */
3758 if (sa != PRO_REGISTER_AND_MOVE) {
3759 spec_i_pt = (buf[20] & 0x08);
3760 all_tg_pt = (buf[20] & 0x04);
3761 aptpl = (buf[20] & 0x01);
3762 } else {
3763 aptpl = (buf[17] & 0x01);
3764 unreg = (buf[17] & 0x02);
3765 }
3766 /*
3767 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3768 */
3769 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3770 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3771 /*
3772 * From spc4r17 section 6.14:
3773 *
3774 * If the SPEC_I_PT bit is set to zero, the service action is not
3775 * REGISTER AND MOVE, and the parameter list length is not 24, then
3776 * the command shall be terminated with CHECK CONDITION status, with
3777 * the sense key set to ILLEGAL REQUEST, and the additional sense
3778 * code set to PARAMETER LIST LENGTH ERROR.
3779 */
3780 if (!(spec_i_pt) && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3781 (cmd->data_length != 24)) {
3782 printk(KERN_WARNING "SPC-PR: Received PR OUT illegal parameter"
3783 " list length: %u\n", cmd->data_length);
3784 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3785 }
3786 /*
3787 * (core_scsi3_emulate_pro_* function parameters
3788 * are defined by spc4r17 Table 174:
3789 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3790 */
3791 switch (sa) {
3792 case PRO_REGISTER:
3793 return core_scsi3_emulate_pro_register(cmd,
3794 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3795 case PRO_RESERVE:
3796 return core_scsi3_emulate_pro_reserve(cmd,
3797 type, scope, res_key);
3798 case PRO_RELEASE:
3799 return core_scsi3_emulate_pro_release(cmd,
3800 type, scope, res_key);
3801 case PRO_CLEAR:
3802 return core_scsi3_emulate_pro_clear(cmd, res_key);
3803 case PRO_PREEMPT:
3804 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3805 res_key, sa_res_key, 0);
3806 case PRO_PREEMPT_AND_ABORT:
3807 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3808 res_key, sa_res_key, 1);
3809 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3810 return core_scsi3_emulate_pro_register(cmd,
3811 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3812 case PRO_REGISTER_AND_MOVE:
3813 return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3814 sa_res_key, aptpl, unreg);
3815 default:
3816 printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service"
3817 " action: 0x%02x\n", cdb[1] & 0x1f);
3818 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3819 }
3820
3821 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3822 }
3823
3824 /*
3825 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3826 *
3827 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3828 */
3829 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3830 {
3831 struct se_device *se_dev = SE_DEV(cmd);
3832 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
3833 struct t10_pr_registration *pr_reg;
3834 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3835 u32 add_len = 0, off = 8;
3836
3837 if (cmd->data_length < 8) {
3838 printk(KERN_ERR "PRIN SA READ_KEYS SCSI Data Length: %u"
3839 " too small\n", cmd->data_length);
3840 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3841 }
3842
3843 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
3844 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
3845 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
3846 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
3847
3848 spin_lock(&T10_RES(su_dev)->registration_lock);
3849 list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
3850 pr_reg_list) {
3851 /*
3852 * Check for overflow of 8byte PRI READ_KEYS payload and
3853 * next reservation key list descriptor.
3854 */
3855 if ((add_len + 8) > (cmd->data_length - 8))
3856 break;
3857
3858 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3859 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3860 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3861 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3862 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3863 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3864 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3865 buf[off++] = (pr_reg->pr_res_key & 0xff);
3866
3867 add_len += 8;
3868 }
3869 spin_unlock(&T10_RES(su_dev)->registration_lock);
3870
3871 buf[4] = ((add_len >> 24) & 0xff);
3872 buf[5] = ((add_len >> 16) & 0xff);
3873 buf[6] = ((add_len >> 8) & 0xff);
3874 buf[7] = (add_len & 0xff);
3875
3876 return 0;
3877 }
3878
3879 /*
3880 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3881 *
3882 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3883 */
3884 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3885 {
3886 struct se_device *se_dev = SE_DEV(cmd);
3887 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
3888 struct t10_pr_registration *pr_reg;
3889 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3890 u64 pr_res_key;
3891 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3892
3893 if (cmd->data_length < 8) {
3894 printk(KERN_ERR "PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3895 " too small\n", cmd->data_length);
3896 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3897 }
3898
3899 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
3900 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
3901 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
3902 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
3903
3904 spin_lock(&se_dev->dev_reservation_lock);
3905 pr_reg = se_dev->dev_pr_res_holder;
3906 if ((pr_reg)) {
3907 /*
3908 * Set the hardcoded Additional Length
3909 */
3910 buf[4] = ((add_len >> 24) & 0xff);
3911 buf[5] = ((add_len >> 16) & 0xff);
3912 buf[6] = ((add_len >> 8) & 0xff);
3913 buf[7] = (add_len & 0xff);
3914
3915 if (cmd->data_length < 22) {
3916 spin_unlock(&se_dev->dev_reservation_lock);
3917 return 0;
3918 }
3919 /*
3920 * Set the Reservation key.
3921 *
3922 * From spc4r17, section 5.7.10:
3923 * A persistent reservation holder has its reservation key
3924 * returned in the parameter data from a PERSISTENT
3925 * RESERVE IN command with READ RESERVATION service action as
3926 * follows:
3927 * a) For a persistent reservation of the type Write Exclusive
3928 * - All Registrants or Exclusive Access ­ All Regitrants,
3929 * the reservation key shall be set to zero; or
3930 * b) For all other persistent reservation types, the
3931 * reservation key shall be set to the registered
3932 * reservation key for the I_T nexus that holds the
3933 * persistent reservation.
3934 */
3935 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3936 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3937 pr_res_key = 0;
3938 else
3939 pr_res_key = pr_reg->pr_res_key;
3940
3941 buf[8] = ((pr_res_key >> 56) & 0xff);
3942 buf[9] = ((pr_res_key >> 48) & 0xff);
3943 buf[10] = ((pr_res_key >> 40) & 0xff);
3944 buf[11] = ((pr_res_key >> 32) & 0xff);
3945 buf[12] = ((pr_res_key >> 24) & 0xff);
3946 buf[13] = ((pr_res_key >> 16) & 0xff);
3947 buf[14] = ((pr_res_key >> 8) & 0xff);
3948 buf[15] = (pr_res_key & 0xff);
3949 /*
3950 * Set the SCOPE and TYPE
3951 */
3952 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3953 (pr_reg->pr_res_type & 0x0f);
3954 }
3955 spin_unlock(&se_dev->dev_reservation_lock);
3956
3957 return 0;
3958 }
3959
3960 /*
3961 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3962 *
3963 * See spc4r17 section 6.13.4 Table 165
3964 */
3965 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3966 {
3967 struct se_device *dev = SE_DEV(cmd);
3968 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
3969 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3970 u16 add_len = 8; /* Hardcoded to 8. */
3971
3972 if (cmd->data_length < 6) {
3973 printk(KERN_ERR "PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3974 " %u too small\n", cmd->data_length);
3975 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3976 }
3977
3978 buf[0] = ((add_len << 8) & 0xff);
3979 buf[1] = (add_len & 0xff);
3980 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3981 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3982 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3983 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3984 /*
3985 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3986 * set the TMV: Task Mask Valid bit.
3987 */
3988 buf[3] |= 0x80;
3989 /*
3990 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3991 */
3992 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3993 /*
3994 * PTPL_A: Persistence across Target Power Loss Active bit
3995 */
3996 if (pr_tmpl->pr_aptpl_active)
3997 buf[3] |= 0x01;
3998 /*
3999 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4000 */
4001 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4002 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4003 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4004 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4005 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4006 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4007
4008 return 0;
4009 }
4010
4011 /*
4012 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4013 *
4014 * See spc4r17 section 6.13.5 Table 168 and 169
4015 */
4016 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4017 {
4018 struct se_device *se_dev = SE_DEV(cmd);
4019 struct se_node_acl *se_nacl;
4020 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
4021 struct se_portal_group *se_tpg;
4022 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4023 struct t10_reservation_template *pr_tmpl = &SU_DEV(se_dev)->t10_reservation;
4024 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
4025 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4026 u32 off = 8; /* off into first Full Status descriptor */
4027 int format_code = 0;
4028
4029 if (cmd->data_length < 8) {
4030 printk(KERN_ERR "PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4031 " too small\n", cmd->data_length);
4032 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4033 }
4034
4035 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
4036 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
4037 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
4038 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
4039
4040 spin_lock(&pr_tmpl->registration_lock);
4041 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4042 &pr_tmpl->registration_list, pr_reg_list) {
4043
4044 se_nacl = pr_reg->pr_reg_nacl;
4045 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4046 add_desc_len = 0;
4047
4048 atomic_inc(&pr_reg->pr_res_holders);
4049 smp_mb__after_atomic_inc();
4050 spin_unlock(&pr_tmpl->registration_lock);
4051 /*
4052 * Determine expected length of $FABRIC_MOD specific
4053 * TransportID full status descriptor..
4054 */
4055 exp_desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id_len(
4056 se_tpg, se_nacl, pr_reg, &format_code);
4057
4058 if ((exp_desc_len + add_len) > cmd->data_length) {
4059 printk(KERN_WARNING "SPC-3 PRIN READ_FULL_STATUS ran"
4060 " out of buffer: %d\n", cmd->data_length);
4061 spin_lock(&pr_tmpl->registration_lock);
4062 atomic_dec(&pr_reg->pr_res_holders);
4063 smp_mb__after_atomic_dec();
4064 break;
4065 }
4066 /*
4067 * Set RESERVATION KEY
4068 */
4069 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4070 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4071 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4072 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4073 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4074 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4075 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4076 buf[off++] = (pr_reg->pr_res_key & 0xff);
4077 off += 4; /* Skip Over Reserved area */
4078
4079 /*
4080 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4081 */
4082 if (pr_reg->pr_reg_all_tg_pt)
4083 buf[off] = 0x02;
4084 /*
4085 * The struct se_lun pointer will be present for the
4086 * reservation holder for PR_HOLDER bit.
4087 *
4088 * Also, if this registration is the reservation
4089 * holder, fill in SCOPE and TYPE in the next byte.
4090 */
4091 if (pr_reg->pr_res_holder) {
4092 buf[off++] |= 0x01;
4093 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4094 (pr_reg->pr_res_type & 0x0f);
4095 } else
4096 off += 2;
4097
4098 off += 4; /* Skip over reserved area */
4099 /*
4100 * From spc4r17 6.3.15:
4101 *
4102 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4103 * IDENTIFIER field contains the relative port identifier (see
4104 * 3.1.120) of the target port that is part of the I_T nexus
4105 * described by this full status descriptor. If the ALL_TG_PT
4106 * bit is set to one, the contents of the RELATIVE TARGET PORT
4107 * IDENTIFIER field are not defined by this standard.
4108 */
4109 if (!(pr_reg->pr_reg_all_tg_pt)) {
4110 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4111
4112 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4113 buf[off++] = (port->sep_rtpi & 0xff);
4114 } else
4115 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4116
4117 /*
4118 * Now, have the $FABRIC_MOD fill in the protocol identifier
4119 */
4120 desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id(se_tpg,
4121 se_nacl, pr_reg, &format_code, &buf[off+4]);
4122
4123 spin_lock(&pr_tmpl->registration_lock);
4124 atomic_dec(&pr_reg->pr_res_holders);
4125 smp_mb__after_atomic_dec();
4126 /*
4127 * Set the ADDITIONAL DESCRIPTOR LENGTH
4128 */
4129 buf[off++] = ((desc_len >> 24) & 0xff);
4130 buf[off++] = ((desc_len >> 16) & 0xff);
4131 buf[off++] = ((desc_len >> 8) & 0xff);
4132 buf[off++] = (desc_len & 0xff);
4133 /*
4134 * Size of full desctipor header minus TransportID
4135 * containing $FABRIC_MOD specific) initiator device/port
4136 * WWN information.
4137 *
4138 * See spc4r17 Section 6.13.5 Table 169
4139 */
4140 add_desc_len = (24 + desc_len);
4141
4142 off += desc_len;
4143 add_len += add_desc_len;
4144 }
4145 spin_unlock(&pr_tmpl->registration_lock);
4146 /*
4147 * Set ADDITIONAL_LENGTH
4148 */
4149 buf[4] = ((add_len >> 24) & 0xff);
4150 buf[5] = ((add_len >> 16) & 0xff);
4151 buf[6] = ((add_len >> 8) & 0xff);
4152 buf[7] = (add_len & 0xff);
4153
4154 return 0;
4155 }
4156
4157 static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
4158 {
4159 switch (cdb[1] & 0x1f) {
4160 case PRI_READ_KEYS:
4161 return core_scsi3_pri_read_keys(cmd);
4162 case PRI_READ_RESERVATION:
4163 return core_scsi3_pri_read_reservation(cmd);
4164 case PRI_REPORT_CAPABILITIES:
4165 return core_scsi3_pri_report_capabilities(cmd);
4166 case PRI_READ_FULL_STATUS:
4167 return core_scsi3_pri_read_full_status(cmd);
4168 default:
4169 printk(KERN_ERR "Unknown PERSISTENT_RESERVE_IN service"
4170 " action: 0x%02x\n", cdb[1] & 0x1f);
4171 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4172 }
4173
4174 }
4175
4176 int core_scsi3_emulate_pr(struct se_cmd *cmd)
4177 {
4178 unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0];
4179 struct se_device *dev = cmd->se_dev;
4180 /*
4181 * Following spc2r20 5.5.1 Reservations overview:
4182 *
4183 * If a logical unit has been reserved by any RESERVE command and is
4184 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4185 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4186 * initiator or service action and shall terminate with a RESERVATION
4187 * CONFLICT status.
4188 */
4189 if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
4190 printk(KERN_ERR "Received PERSISTENT_RESERVE CDB while legacy"
4191 " SPC-2 reservation is held, returning"
4192 " RESERVATION_CONFLICT\n");
4193 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4194 }
4195
4196 return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
4197 core_scsi3_emulate_pr_out(cmd, cdb) :
4198 core_scsi3_emulate_pr_in(cmd, cdb);
4199 }
4200
4201 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4202 {
4203 return 0;
4204 }
4205
4206 static int core_pt_seq_non_holder(
4207 struct se_cmd *cmd,
4208 unsigned char *cdb,
4209 u32 pr_reg_type)
4210 {
4211 return 0;
4212 }
4213
4214 int core_setup_reservations(struct se_device *dev, int force_pt)
4215 {
4216 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4217 struct t10_reservation_template *rest = &su_dev->t10_reservation;
4218 /*
4219 * If this device is from Target_Core_Mod/pSCSI, use the reservations
4220 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
4221 * cause a problem because libata and some SATA RAID HBAs appear
4222 * under Linux/SCSI, but to emulate reservations themselves.
4223 */
4224 if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4225 !(DEV_ATTRIB(dev)->emulate_reservations)) || force_pt) {
4226 rest->res_type = SPC_PASSTHROUGH;
4227 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4228 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4229 printk(KERN_INFO "%s: Using SPC_PASSTHROUGH, no reservation"
4230 " emulation\n", TRANSPORT(dev)->name);
4231 return 0;
4232 }
4233 /*
4234 * If SPC-3 or above is reported by real or emulated struct se_device,
4235 * use emulated Persistent Reservations.
4236 */
4237 if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) {
4238 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4239 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4240 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4241 printk(KERN_INFO "%s: Using SPC3_PERSISTENT_RESERVATIONS"
4242 " emulation\n", TRANSPORT(dev)->name);
4243 } else {
4244 rest->res_type = SPC2_RESERVATIONS;
4245 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4246 rest->pr_ops.t10_seq_non_holder =
4247 &core_scsi2_reservation_seq_non_holder;
4248 printk(KERN_INFO "%s: Using SPC2_RESERVATIONS emulation\n",
4249 TRANSPORT(dev)->name);
4250 }
4251
4252 return 0;
4253 }
Linux with added FPC-III support