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mm: improve page_lock_anon_vma() comment
[linux-2.6.git] / drivers / target / target_core_pr.c
bloba79f518ca6e2b76e12312d55f536cdb732640802
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 ret = 0; /*/ Allowed CDBs */
475 break;
476 default:
477 other_cdb = 1;
478 break;
479 }
480 /*
481 * Case where the CDB is explicitly allowed in the above switch
482 * statement.
483 */
484 if (!(ret) && !(other_cdb)) {
485 #if 0
486 printk(KERN_INFO "Allowing explict CDB: 0x%02x for %s"
487 " reservation holder\n", cdb[0],
488 core_scsi3_pr_dump_type(pr_reg_type));
489 #endif
490 return ret;
491 }
492 /*
493 * Check if write exclusive initiator ports *NOT* holding the
494 * WRITE_EXCLUSIVE_* reservation.
495 */
496 if ((we) && !(registered_nexus)) {
497 if (cmd->data_direction == DMA_TO_DEVICE) {
498 /*
499 * Conflict for write exclusive
500 */
501 printk(KERN_INFO "%s Conflict for unregistered nexus"
502 " %s CDB: 0x%02x to %s reservation\n",
503 transport_dump_cmd_direction(cmd),
504 se_sess->se_node_acl->initiatorname, cdb[0],
505 core_scsi3_pr_dump_type(pr_reg_type));
506 return 1;
507 } else {
508 /*
509 * Allow non WRITE CDBs for all Write Exclusive
510 * PR TYPEs to pass for registered and
511 * non-registered_nexuxes NOT holding the reservation.
512 *
513 * We only make noise for the unregisterd nexuses,
514 * as we expect registered non-reservation holding
515 * nexuses to issue CDBs.
516 */
517 #if 0
518 if (!(registered_nexus)) {
519 printk(KERN_INFO "Allowing implict CDB: 0x%02x"
520 " for %s reservation on unregistered"
521 " nexus\n", cdb[0],
522 core_scsi3_pr_dump_type(pr_reg_type));
523 }
524 #endif
525 return 0;
526 }
527 } else if ((reg_only) || (all_reg)) {
528 if (registered_nexus) {
529 /*
530 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
531 * allow commands from registered nexuses.
532 */
533 #if 0
534 printk(KERN_INFO "Allowing implict CDB: 0x%02x for %s"
535 " reservation\n", cdb[0],
536 core_scsi3_pr_dump_type(pr_reg_type));
537 #endif
538 return 0;
539 }
540 }
541 printk(KERN_INFO "%s Conflict for %sregistered nexus %s CDB: 0x%2x"
542 " for %s reservation\n", transport_dump_cmd_direction(cmd),
543 (registered_nexus) ? "" : "un",
544 se_sess->se_node_acl->initiatorname, cdb[0],
545 core_scsi3_pr_dump_type(pr_reg_type));
546
547 return 1; /* Conflict by default */
548 }
549
550 static u32 core_scsi3_pr_generation(struct se_device *dev)
551 {
552 struct se_subsystem_dev *su_dev = SU_DEV(dev);
553 u32 prg;
554 /*
555 * PRGeneration field shall contain the value of a 32-bit wrapping
556 * counter mainted by the device server.
557 *
558 * Note that this is done regardless of Active Persist across
559 * Target PowerLoss (APTPL)
560 *
561 * See spc4r17 section 6.3.12 READ_KEYS service action
562 */
563 spin_lock(&dev->dev_reservation_lock);
564 prg = T10_RES(su_dev)->pr_generation++;
565 spin_unlock(&dev->dev_reservation_lock);
566
567 return prg;
568 }
569
570 static int core_scsi3_pr_reservation_check(
571 struct se_cmd *cmd,
572 u32 *pr_reg_type)
573 {
574 struct se_device *dev = cmd->se_dev;
575 struct se_session *sess = cmd->se_sess;
576 int ret;
577
578 if (!(sess))
579 return 0;
580 /*
581 * A legacy SPC-2 reservation is being held.
582 */
583 if (dev->dev_flags & DF_SPC2_RESERVATIONS)
584 return core_scsi2_reservation_check(cmd, pr_reg_type);
585
586 spin_lock(&dev->dev_reservation_lock);
587 if (!(dev->dev_pr_res_holder)) {
588 spin_unlock(&dev->dev_reservation_lock);
589 return 0;
590 }
591 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
592 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
593 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
594 spin_unlock(&dev->dev_reservation_lock);
595 return -1;
596 }
597 if (!(dev->dev_pr_res_holder->isid_present_at_reg)) {
598 spin_unlock(&dev->dev_reservation_lock);
599 return 0;
600 }
601 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
602 sess->sess_bin_isid) ? 0 : -1;
603 /*
604 * Use bit in *pr_reg_type to notify ISID mismatch in
605 * core_scsi3_pr_seq_non_holder().
606 */
607 if (ret != 0)
608 *pr_reg_type |= 0x80000000;
609 spin_unlock(&dev->dev_reservation_lock);
610
611 return ret;
612 }
613
614 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
615 struct se_device *dev,
616 struct se_node_acl *nacl,
617 struct se_dev_entry *deve,
618 unsigned char *isid,
619 u64 sa_res_key,
620 int all_tg_pt,
621 int aptpl)
622 {
623 struct se_subsystem_dev *su_dev = SU_DEV(dev);
624 struct t10_pr_registration *pr_reg;
625
626 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
627 if (!(pr_reg)) {
628 printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
629 return NULL;
630 }
631
632 pr_reg->pr_aptpl_buf = kzalloc(T10_RES(su_dev)->pr_aptpl_buf_len,
633 GFP_ATOMIC);
634 if (!(pr_reg->pr_aptpl_buf)) {
635 printk(KERN_ERR "Unable to allocate pr_reg->pr_aptpl_buf\n");
636 kmem_cache_free(t10_pr_reg_cache, pr_reg);
637 return NULL;
638 }
639
640 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
641 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
642 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
643 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
644 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
645 atomic_set(&pr_reg->pr_res_holders, 0);
646 pr_reg->pr_reg_nacl = nacl;
647 pr_reg->pr_reg_deve = deve;
648 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
649 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
650 pr_reg->pr_res_key = sa_res_key;
651 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
652 pr_reg->pr_reg_aptpl = aptpl;
653 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
654 /*
655 * If an ISID value for this SCSI Initiator Port exists,
656 * save it to the registration now.
657 */
658 if (isid != NULL) {
659 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
660 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
661 pr_reg->isid_present_at_reg = 1;
662 }
663
664 return pr_reg;
665 }
666
667 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
668 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
669
670 /*
671 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
672 * modes.
673 */
674 static struct t10_pr_registration *__core_scsi3_alloc_registration(
675 struct se_device *dev,
676 struct se_node_acl *nacl,
677 struct se_dev_entry *deve,
678 unsigned char *isid,
679 u64 sa_res_key,
680 int all_tg_pt,
681 int aptpl)
682 {
683 struct se_dev_entry *deve_tmp;
684 struct se_node_acl *nacl_tmp;
685 struct se_port *port, *port_tmp;
686 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
687 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
688 int ret;
689 /*
690 * Create a registration for the I_T Nexus upon which the
691 * PROUT REGISTER was received.
692 */
693 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
694 sa_res_key, all_tg_pt, aptpl);
695 if (!(pr_reg))
696 return NULL;
697 /*
698 * Return pointer to pr_reg for ALL_TG_PT=0
699 */
700 if (!(all_tg_pt))
701 return pr_reg;
702 /*
703 * Create list of matching SCSI Initiator Port registrations
704 * for ALL_TG_PT=1
705 */
706 spin_lock(&dev->se_port_lock);
707 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
708 atomic_inc(&port->sep_tg_pt_ref_cnt);
709 smp_mb__after_atomic_inc();
710 spin_unlock(&dev->se_port_lock);
711
712 spin_lock_bh(&port->sep_alua_lock);
713 list_for_each_entry(deve_tmp, &port->sep_alua_list,
714 alua_port_list) {
715 /*
716 * This pointer will be NULL for demo mode MappedLUNs
717 * that have not been make explict via a ConfigFS
718 * MappedLUN group for the SCSI Initiator Node ACL.
719 */
720 if (!(deve_tmp->se_lun_acl))
721 continue;
722
723 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
724 /*
725 * Skip the matching struct se_node_acl that is allocated
726 * above..
727 */
728 if (nacl == nacl_tmp)
729 continue;
730 /*
731 * Only perform PR registrations for target ports on
732 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
733 * arrived.
734 */
735 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
736 continue;
737 /*
738 * Look for a matching Initiator Node ACL in ASCII format
739 */
740 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
741 continue;
742
743 atomic_inc(&deve_tmp->pr_ref_count);
744 smp_mb__after_atomic_inc();
745 spin_unlock_bh(&port->sep_alua_lock);
746 /*
747 * Grab a configfs group dependency that is released
748 * for the exception path at label out: below, or upon
749 * completion of adding ALL_TG_PT=1 registrations in
750 * __core_scsi3_add_registration()
751 */
752 ret = core_scsi3_lunacl_depend_item(deve_tmp);
753 if (ret < 0) {
754 printk(KERN_ERR "core_scsi3_lunacl_depend"
755 "_item() failed\n");
756 atomic_dec(&port->sep_tg_pt_ref_cnt);
757 smp_mb__after_atomic_dec();
758 atomic_dec(&deve_tmp->pr_ref_count);
759 smp_mb__after_atomic_dec();
760 goto out;
761 }
762 /*
763 * Located a matching SCSI Initiator Port on a different
764 * port, allocate the pr_reg_atp and attach it to the
765 * pr_reg->pr_reg_atp_list that will be processed once
766 * the original *pr_reg is processed in
767 * __core_scsi3_add_registration()
768 */
769 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
770 nacl_tmp, deve_tmp, NULL,
771 sa_res_key, all_tg_pt, aptpl);
772 if (!(pr_reg_atp)) {
773 atomic_dec(&port->sep_tg_pt_ref_cnt);
774 smp_mb__after_atomic_dec();
775 atomic_dec(&deve_tmp->pr_ref_count);
776 smp_mb__after_atomic_dec();
777 core_scsi3_lunacl_undepend_item(deve_tmp);
778 goto out;
779 }
780
781 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
782 &pr_reg->pr_reg_atp_list);
783 spin_lock_bh(&port->sep_alua_lock);
784 }
785 spin_unlock_bh(&port->sep_alua_lock);
786
787 spin_lock(&dev->se_port_lock);
788 atomic_dec(&port->sep_tg_pt_ref_cnt);
789 smp_mb__after_atomic_dec();
790 }
791 spin_unlock(&dev->se_port_lock);
792
793 return pr_reg;
794 out:
795 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
796 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
797 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
798 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
799 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
800 }
801 kmem_cache_free(t10_pr_reg_cache, pr_reg);
802 return NULL;
803 }
804
805 int core_scsi3_alloc_aptpl_registration(
806 struct t10_reservation_template *pr_tmpl,
807 u64 sa_res_key,
808 unsigned char *i_port,
809 unsigned char *isid,
810 u32 mapped_lun,
811 unsigned char *t_port,
812 u16 tpgt,
813 u32 target_lun,
814 int res_holder,
815 int all_tg_pt,
816 u8 type)
817 {
818 struct t10_pr_registration *pr_reg;
819
820 if (!(i_port) || !(t_port) || !(sa_res_key)) {
821 printk(KERN_ERR "Illegal parameters for APTPL registration\n");
822 return -1;
823 }
824
825 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
826 if (!(pr_reg)) {
827 printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
828 return -1;
829 }
830 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
831
832 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
833 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
834 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
835 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
836 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
837 atomic_set(&pr_reg->pr_res_holders, 0);
838 pr_reg->pr_reg_nacl = NULL;
839 pr_reg->pr_reg_deve = NULL;
840 pr_reg->pr_res_mapped_lun = mapped_lun;
841 pr_reg->pr_aptpl_target_lun = target_lun;
842 pr_reg->pr_res_key = sa_res_key;
843 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
844 pr_reg->pr_reg_aptpl = 1;
845 pr_reg->pr_reg_tg_pt_lun = NULL;
846 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
847 pr_reg->pr_res_type = type;
848 /*
849 * If an ISID value had been saved in APTPL metadata for this
850 * SCSI Initiator Port, restore it now.
851 */
852 if (isid != NULL) {
853 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
854 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
855 pr_reg->isid_present_at_reg = 1;
856 }
857 /*
858 * Copy the i_port and t_port information from caller.
859 */
860 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
861 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
862 pr_reg->pr_reg_tpgt = tpgt;
863 /*
864 * Set pr_res_holder from caller, the pr_reg who is the reservation
865 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
866 * the Initiator Node LUN ACL from the fabric module is created for
867 * this registration.
868 */
869 pr_reg->pr_res_holder = res_holder;
870
871 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
872 printk(KERN_INFO "SPC-3 PR APTPL Successfully added registration%s from"
873 " metadata\n", (res_holder) ? "+reservation" : "");
874 return 0;
875 }
876
877 static void core_scsi3_aptpl_reserve(
878 struct se_device *dev,
879 struct se_portal_group *tpg,
880 struct se_node_acl *node_acl,
881 struct t10_pr_registration *pr_reg)
882 {
883 char i_buf[PR_REG_ISID_ID_LEN];
884 int prf_isid;
885
886 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
887 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
888 PR_REG_ISID_ID_LEN);
889
890 spin_lock(&dev->dev_reservation_lock);
891 dev->dev_pr_res_holder = pr_reg;
892 spin_unlock(&dev->dev_reservation_lock);
893
894 printk(KERN_INFO "SPC-3 PR [%s] Service Action: APTPL RESERVE created"
895 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
896 TPG_TFO(tpg)->get_fabric_name(),
897 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
898 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
899 printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
900 TPG_TFO(tpg)->get_fabric_name(), node_acl->initiatorname,
901 (prf_isid) ? &i_buf[0] : "");
902 }
903
904 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
905 struct t10_pr_registration *, int, int);
906
907 static int __core_scsi3_check_aptpl_registration(
908 struct se_device *dev,
909 struct se_portal_group *tpg,
910 struct se_lun *lun,
911 u32 target_lun,
912 struct se_node_acl *nacl,
913 struct se_dev_entry *deve)
914 {
915 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
916 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
917 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
918 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
919 u16 tpgt;
920
921 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
922 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
923 /*
924 * Copy Initiator Port information from struct se_node_acl
925 */
926 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
927 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
928 TPG_TFO(tpg)->tpg_get_wwn(tpg));
929 tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg);
930 /*
931 * Look for the matching registrations+reservation from those
932 * created from APTPL metadata. Note that multiple registrations
933 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
934 * TransportIDs.
935 */
936 spin_lock(&pr_tmpl->aptpl_reg_lock);
937 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
938 pr_reg_aptpl_list) {
939 if (!(strcmp(pr_reg->pr_iport, i_port)) &&
940 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
941 !(strcmp(pr_reg->pr_tport, t_port)) &&
942 (pr_reg->pr_reg_tpgt == tpgt) &&
943 (pr_reg->pr_aptpl_target_lun == target_lun)) {
944
945 pr_reg->pr_reg_nacl = nacl;
946 pr_reg->pr_reg_deve = deve;
947 pr_reg->pr_reg_tg_pt_lun = lun;
948
949 list_del(&pr_reg->pr_reg_aptpl_list);
950 spin_unlock(&pr_tmpl->aptpl_reg_lock);
951 /*
952 * At this point all of the pointers in *pr_reg will
953 * be setup, so go ahead and add the registration.
954 */
955
956 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
957 /*
958 * If this registration is the reservation holder,
959 * make that happen now..
960 */
961 if (pr_reg->pr_res_holder)
962 core_scsi3_aptpl_reserve(dev, tpg,
963 nacl, pr_reg);
964 /*
965 * Reenable pr_aptpl_active to accept new metadata
966 * updates once the SCSI device is active again..
967 */
968 spin_lock(&pr_tmpl->aptpl_reg_lock);
969 pr_tmpl->pr_aptpl_active = 1;
970 }
971 }
972 spin_unlock(&pr_tmpl->aptpl_reg_lock);
973
974 return 0;
975 }
976
977 int core_scsi3_check_aptpl_registration(
978 struct se_device *dev,
979 struct se_portal_group *tpg,
980 struct se_lun *lun,
981 struct se_lun_acl *lun_acl)
982 {
983 struct se_subsystem_dev *su_dev = SU_DEV(dev);
984 struct se_node_acl *nacl = lun_acl->se_lun_nacl;
985 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
986
987 if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
988 return 0;
989
990 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
991 lun->unpacked_lun, nacl, deve);
992 }
993
994 static void __core_scsi3_dump_registration(
995 struct target_core_fabric_ops *tfo,
996 struct se_device *dev,
997 struct se_node_acl *nacl,
998 struct t10_pr_registration *pr_reg,
999 int register_type)
1000 {
1001 struct se_portal_group *se_tpg = nacl->se_tpg;
1002 char i_buf[PR_REG_ISID_ID_LEN];
1003 int prf_isid;
1004
1005 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1006 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1007 PR_REG_ISID_ID_LEN);
1008
1009 printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1010 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1011 "_AND_MOVE" : (register_type == 1) ?
1012 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1013 (prf_isid) ? i_buf : "");
1014 printk(KERN_INFO "SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1015 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1016 tfo->tpg_get_tag(se_tpg));
1017 printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1018 " Port(s)\n", tfo->get_fabric_name(),
1019 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1020 TRANSPORT(dev)->name);
1021 printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1022 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
1023 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1024 pr_reg->pr_reg_aptpl);
1025 }
1026
1027 /*
1028 * this function can be called with struct se_device->dev_reservation_lock
1029 * when register_move = 1
1030 */
1031 static void __core_scsi3_add_registration(
1032 struct se_device *dev,
1033 struct se_node_acl *nacl,
1034 struct t10_pr_registration *pr_reg,
1035 int register_type,
1036 int register_move)
1037 {
1038 struct se_subsystem_dev *su_dev = SU_DEV(dev);
1039 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1040 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1041 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1042
1043 /*
1044 * Increment PRgeneration counter for struct se_device upon a successful
1045 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1046 *
1047 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1048 * action, the struct se_device->dev_reservation_lock will already be held,
1049 * so we do not call core_scsi3_pr_generation() which grabs the lock
1050 * for the REGISTER.
1051 */
1052 pr_reg->pr_res_generation = (register_move) ?
1053 T10_RES(su_dev)->pr_generation++ :
1054 core_scsi3_pr_generation(dev);
1055
1056 spin_lock(&pr_tmpl->registration_lock);
1057 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1058 pr_reg->pr_reg_deve->def_pr_registered = 1;
1059
1060 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1061 spin_unlock(&pr_tmpl->registration_lock);
1062 /*
1063 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1064 */
1065 if (!(pr_reg->pr_reg_all_tg_pt) || (register_move))
1066 return;
1067 /*
1068 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1069 * allocated in __core_scsi3_alloc_registration()
1070 */
1071 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1072 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1073 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1074
1075 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1076
1077 spin_lock(&pr_tmpl->registration_lock);
1078 list_add_tail(&pr_reg_tmp->pr_reg_list,
1079 &pr_tmpl->registration_list);
1080 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1081
1082 __core_scsi3_dump_registration(tfo, dev,
1083 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1084 register_type);
1085 spin_unlock(&pr_tmpl->registration_lock);
1086 /*
1087 * Drop configfs group dependency reference from
1088 * __core_scsi3_alloc_registration()
1089 */
1090 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1091 }
1092 }
1093
1094 static int core_scsi3_alloc_registration(
1095 struct se_device *dev,
1096 struct se_node_acl *nacl,
1097 struct se_dev_entry *deve,
1098 unsigned char *isid,
1099 u64 sa_res_key,
1100 int all_tg_pt,
1101 int aptpl,
1102 int register_type,
1103 int register_move)
1104 {
1105 struct t10_pr_registration *pr_reg;
1106
1107 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1108 sa_res_key, all_tg_pt, aptpl);
1109 if (!(pr_reg))
1110 return -1;
1111
1112 __core_scsi3_add_registration(dev, nacl, pr_reg,
1113 register_type, register_move);
1114 return 0;
1115 }
1116
1117 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1118 struct se_device *dev,
1119 struct se_node_acl *nacl,
1120 unsigned char *isid)
1121 {
1122 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1123 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1124 struct se_portal_group *tpg;
1125
1126 spin_lock(&pr_tmpl->registration_lock);
1127 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1128 &pr_tmpl->registration_list, pr_reg_list) {
1129 /*
1130 * First look for a matching struct se_node_acl
1131 */
1132 if (pr_reg->pr_reg_nacl != nacl)
1133 continue;
1134
1135 tpg = pr_reg->pr_reg_nacl->se_tpg;
1136 /*
1137 * If this registration does NOT contain a fabric provided
1138 * ISID, then we have found a match.
1139 */
1140 if (!(pr_reg->isid_present_at_reg)) {
1141 /*
1142 * Determine if this SCSI device server requires that
1143 * SCSI Intiatior TransportID w/ ISIDs is enforced
1144 * for fabric modules (iSCSI) requiring them.
1145 */
1146 if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
1147 if (DEV_ATTRIB(dev)->enforce_pr_isids)
1148 continue;
1149 }
1150 atomic_inc(&pr_reg->pr_res_holders);
1151 smp_mb__after_atomic_inc();
1152 spin_unlock(&pr_tmpl->registration_lock);
1153 return pr_reg;
1154 }
1155 /*
1156 * If the *pr_reg contains a fabric defined ISID for multi-value
1157 * SCSI Initiator Port TransportIDs, then we expect a valid
1158 * matching ISID to be provided by the local SCSI Initiator Port.
1159 */
1160 if (!(isid))
1161 continue;
1162 if (strcmp(isid, pr_reg->pr_reg_isid))
1163 continue;
1164
1165 atomic_inc(&pr_reg->pr_res_holders);
1166 smp_mb__after_atomic_inc();
1167 spin_unlock(&pr_tmpl->registration_lock);
1168 return pr_reg;
1169 }
1170 spin_unlock(&pr_tmpl->registration_lock);
1171
1172 return NULL;
1173 }
1174
1175 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1176 struct se_device *dev,
1177 struct se_node_acl *nacl,
1178 struct se_session *sess)
1179 {
1180 struct se_portal_group *tpg = nacl->se_tpg;
1181 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1182
1183 if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
1184 memset(&buf[0], 0, PR_REG_ISID_LEN);
1185 TPG_TFO(tpg)->sess_get_initiator_sid(sess, &buf[0],
1186 PR_REG_ISID_LEN);
1187 isid_ptr = &buf[0];
1188 }
1189
1190 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1191 }
1192
1193 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1194 {
1195 atomic_dec(&pr_reg->pr_res_holders);
1196 smp_mb__after_atomic_dec();
1197 }
1198
1199 static int core_scsi3_check_implict_release(
1200 struct se_device *dev,
1201 struct t10_pr_registration *pr_reg)
1202 {
1203 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1204 struct t10_pr_registration *pr_res_holder;
1205 int ret = 0;
1206
1207 spin_lock(&dev->dev_reservation_lock);
1208 pr_res_holder = dev->dev_pr_res_holder;
1209 if (!(pr_res_holder)) {
1210 spin_unlock(&dev->dev_reservation_lock);
1211 return ret;
1212 }
1213 if (pr_res_holder == pr_reg) {
1214 /*
1215 * Perform an implict RELEASE if the registration that
1216 * is being released is holding the reservation.
1217 *
1218 * From spc4r17, section 5.7.11.1:
1219 *
1220 * e) If the I_T nexus is the persistent reservation holder
1221 * and the persistent reservation is not an all registrants
1222 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1223 * service action or REGISTER AND IGNORE EXISTING KEY
1224 * service action with the SERVICE ACTION RESERVATION KEY
1225 * field set to zero (see 5.7.11.3).
1226 */
1227 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1228 ret = 1;
1229 /*
1230 * For 'All Registrants' reservation types, all existing
1231 * registrations are still processed as reservation holders
1232 * in core_scsi3_pr_seq_non_holder() after the initial
1233 * reservation holder is implictly released here.
1234 */
1235 } else if (pr_reg->pr_reg_all_tg_pt &&
1236 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1237 pr_reg->pr_reg_nacl->initiatorname)) &&
1238 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1239 printk(KERN_ERR "SPC-3 PR: Unable to perform ALL_TG_PT=1"
1240 " UNREGISTER while existing reservation with matching"
1241 " key 0x%016Lx is present from another SCSI Initiator"
1242 " Port\n", pr_reg->pr_res_key);
1243 ret = -1;
1244 }
1245 spin_unlock(&dev->dev_reservation_lock);
1246
1247 return ret;
1248 }
1249
1250 /*
1251 * Called with struct t10_reservation_template->registration_lock held.
1252 */
1253 static void __core_scsi3_free_registration(
1254 struct se_device *dev,
1255 struct t10_pr_registration *pr_reg,
1256 struct list_head *preempt_and_abort_list,
1257 int dec_holders)
1258 {
1259 struct target_core_fabric_ops *tfo =
1260 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1261 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1262 char i_buf[PR_REG_ISID_ID_LEN];
1263 int prf_isid;
1264
1265 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1266 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1267 PR_REG_ISID_ID_LEN);
1268
1269 pr_reg->pr_reg_deve->def_pr_registered = 0;
1270 pr_reg->pr_reg_deve->pr_res_key = 0;
1271 list_del(&pr_reg->pr_reg_list);
1272 /*
1273 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1274 * so call core_scsi3_put_pr_reg() to decrement our reference.
1275 */
1276 if (dec_holders)
1277 core_scsi3_put_pr_reg(pr_reg);
1278 /*
1279 * Wait until all reference from any other I_T nexuses for this
1280 * *pr_reg have been released. Because list_del() is called above,
1281 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1282 * count back to zero, and we release *pr_reg.
1283 */
1284 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1285 spin_unlock(&pr_tmpl->registration_lock);
1286 printk("SPC-3 PR [%s] waiting for pr_res_holders\n",
1287 tfo->get_fabric_name());
1288 cpu_relax();
1289 spin_lock(&pr_tmpl->registration_lock);
1290 }
1291
1292 printk(KERN_INFO "SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1293 " Node: %s%s\n", tfo->get_fabric_name(),
1294 pr_reg->pr_reg_nacl->initiatorname,
1295 (prf_isid) ? &i_buf[0] : "");
1296 printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1297 " Port(s)\n", tfo->get_fabric_name(),
1298 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1299 TRANSPORT(dev)->name);
1300 printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1301 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1302 pr_reg->pr_res_generation);
1303
1304 if (!(preempt_and_abort_list)) {
1305 pr_reg->pr_reg_deve = NULL;
1306 pr_reg->pr_reg_nacl = NULL;
1307 kfree(pr_reg->pr_aptpl_buf);
1308 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1309 return;
1310 }
1311 /*
1312 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1313 * are released once the ABORT_TASK_SET has completed..
1314 */
1315 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1316 }
1317
1318 void core_scsi3_free_pr_reg_from_nacl(
1319 struct se_device *dev,
1320 struct se_node_acl *nacl)
1321 {
1322 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1323 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1324 /*
1325 * If the passed se_node_acl matches the reservation holder,
1326 * release the reservation.
1327 */
1328 spin_lock(&dev->dev_reservation_lock);
1329 pr_res_holder = dev->dev_pr_res_holder;
1330 if ((pr_res_holder != NULL) &&
1331 (pr_res_holder->pr_reg_nacl == nacl))
1332 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1333 spin_unlock(&dev->dev_reservation_lock);
1334 /*
1335 * Release any registration associated with the struct se_node_acl.
1336 */
1337 spin_lock(&pr_tmpl->registration_lock);
1338 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1339 &pr_tmpl->registration_list, pr_reg_list) {
1340
1341 if (pr_reg->pr_reg_nacl != nacl)
1342 continue;
1343
1344 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1345 }
1346 spin_unlock(&pr_tmpl->registration_lock);
1347 }
1348
1349 void core_scsi3_free_all_registrations(
1350 struct se_device *dev)
1351 {
1352 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
1353 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1354
1355 spin_lock(&dev->dev_reservation_lock);
1356 pr_res_holder = dev->dev_pr_res_holder;
1357 if (pr_res_holder != NULL) {
1358 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1359 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1360 pr_res_holder, 0);
1361 }
1362 spin_unlock(&dev->dev_reservation_lock);
1363
1364 spin_lock(&pr_tmpl->registration_lock);
1365 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1366 &pr_tmpl->registration_list, pr_reg_list) {
1367
1368 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1369 }
1370 spin_unlock(&pr_tmpl->registration_lock);
1371
1372 spin_lock(&pr_tmpl->aptpl_reg_lock);
1373 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1374 pr_reg_aptpl_list) {
1375 list_del(&pr_reg->pr_reg_aptpl_list);
1376 kfree(pr_reg->pr_aptpl_buf);
1377 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1378 }
1379 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1380 }
1381
1382 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1383 {
1384 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1385 &tpg->tpg_group.cg_item);
1386 }
1387
1388 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1389 {
1390 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1391 &tpg->tpg_group.cg_item);
1392
1393 atomic_dec(&tpg->tpg_pr_ref_count);
1394 smp_mb__after_atomic_dec();
1395 }
1396
1397 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1398 {
1399 struct se_portal_group *tpg = nacl->se_tpg;
1400
1401 if (nacl->dynamic_node_acl)
1402 return 0;
1403
1404 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1405 &nacl->acl_group.cg_item);
1406 }
1407
1408 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1409 {
1410 struct se_portal_group *tpg = nacl->se_tpg;
1411
1412 if (nacl->dynamic_node_acl) {
1413 atomic_dec(&nacl->acl_pr_ref_count);
1414 smp_mb__after_atomic_dec();
1415 return;
1416 }
1417
1418 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1419 &nacl->acl_group.cg_item);
1420
1421 atomic_dec(&nacl->acl_pr_ref_count);
1422 smp_mb__after_atomic_dec();
1423 }
1424
1425 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1426 {
1427 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1428 struct se_node_acl *nacl;
1429 struct se_portal_group *tpg;
1430 /*
1431 * For nacl->dynamic_node_acl=1
1432 */
1433 if (!(lun_acl))
1434 return 0;
1435
1436 nacl = lun_acl->se_lun_nacl;
1437 tpg = nacl->se_tpg;
1438
1439 return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
1440 &lun_acl->se_lun_group.cg_item);
1441 }
1442
1443 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1444 {
1445 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1446 struct se_node_acl *nacl;
1447 struct se_portal_group *tpg;
1448 /*
1449 * For nacl->dynamic_node_acl=1
1450 */
1451 if (!(lun_acl)) {
1452 atomic_dec(&se_deve->pr_ref_count);
1453 smp_mb__after_atomic_dec();
1454 return;
1455 }
1456 nacl = lun_acl->se_lun_nacl;
1457 tpg = nacl->se_tpg;
1458
1459 configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
1460 &lun_acl->se_lun_group.cg_item);
1461
1462 atomic_dec(&se_deve->pr_ref_count);
1463 smp_mb__after_atomic_dec();
1464 }
1465
1466 static int core_scsi3_decode_spec_i_port(
1467 struct se_cmd *cmd,
1468 struct se_portal_group *tpg,
1469 unsigned char *l_isid,
1470 u64 sa_res_key,
1471 int all_tg_pt,
1472 int aptpl)
1473 {
1474 struct se_device *dev = SE_DEV(cmd);
1475 struct se_port *tmp_port;
1476 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1477 struct se_session *se_sess = SE_SESS(cmd);
1478 struct se_node_acl *dest_node_acl = NULL;
1479 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1480 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1481 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1482 struct list_head tid_dest_list;
1483 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1484 struct target_core_fabric_ops *tmp_tf_ops;
1485 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
1486 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1487 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1488 u32 tpdl, tid_len = 0;
1489 int ret, dest_local_nexus, prf_isid;
1490 u32 dest_rtpi = 0;
1491
1492 memset(dest_iport, 0, 64);
1493 INIT_LIST_HEAD(&tid_dest_list);
1494
1495 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1496 /*
1497 * Allocate a struct pr_transport_id_holder and setup the
1498 * local_node_acl and local_se_deve pointers and add to
1499 * struct list_head tid_dest_list for add registration
1500 * processing in the loop of tid_dest_list below.
1501 */
1502 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1503 if (!(tidh_new)) {
1504 printk(KERN_ERR "Unable to allocate tidh_new\n");
1505 return PYX_TRANSPORT_LU_COMM_FAILURE;
1506 }
1507 INIT_LIST_HEAD(&tidh_new->dest_list);
1508 tidh_new->dest_tpg = tpg;
1509 tidh_new->dest_node_acl = se_sess->se_node_acl;
1510 tidh_new->dest_se_deve = local_se_deve;
1511
1512 local_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
1513 se_sess->se_node_acl, local_se_deve, l_isid,
1514 sa_res_key, all_tg_pt, aptpl);
1515 if (!(local_pr_reg)) {
1516 kfree(tidh_new);
1517 return PYX_TRANSPORT_LU_COMM_FAILURE;
1518 }
1519 tidh_new->dest_pr_reg = local_pr_reg;
1520 /*
1521 * The local I_T nexus does not hold any configfs dependances,
1522 * so we set tid_h->dest_local_nexus=1 to prevent the
1523 * configfs_undepend_item() calls in the tid_dest_list loops below.
1524 */
1525 tidh_new->dest_local_nexus = 1;
1526 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1527 /*
1528 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1529 * first extract TransportID Parameter Data Length, and make sure
1530 * the value matches up to the SCSI expected data transfer length.
1531 */
1532 tpdl = (buf[24] & 0xff) << 24;
1533 tpdl |= (buf[25] & 0xff) << 16;
1534 tpdl |= (buf[26] & 0xff) << 8;
1535 tpdl |= buf[27] & 0xff;
1536
1537 if ((tpdl + 28) != cmd->data_length) {
1538 printk(KERN_ERR "SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1539 " does not equal CDB data_length: %u\n", tpdl,
1540 cmd->data_length);
1541 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1542 goto out;
1543 }
1544 /*
1545 * Start processing the received transport IDs using the
1546 * receiving I_T Nexus portal's fabric dependent methods to
1547 * obtain the SCSI Initiator Port/Device Identifiers.
1548 */
1549 ptr = &buf[28];
1550
1551 while (tpdl > 0) {
1552 proto_ident = (ptr[0] & 0x0f);
1553 dest_tpg = NULL;
1554
1555 spin_lock(&dev->se_port_lock);
1556 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1557 tmp_tpg = tmp_port->sep_tpg;
1558 if (!(tmp_tpg))
1559 continue;
1560 tmp_tf_ops = TPG_TFO(tmp_tpg);
1561 if (!(tmp_tf_ops))
1562 continue;
1563 if (!(tmp_tf_ops->get_fabric_proto_ident) ||
1564 !(tmp_tf_ops->tpg_parse_pr_out_transport_id))
1565 continue;
1566 /*
1567 * Look for the matching proto_ident provided by
1568 * the received TransportID
1569 */
1570 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1571 if (tmp_proto_ident != proto_ident)
1572 continue;
1573 dest_rtpi = tmp_port->sep_rtpi;
1574
1575 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1576 tmp_tpg, (const char *)ptr, &tid_len,
1577 &iport_ptr);
1578 if (!(i_str))
1579 continue;
1580
1581 atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1582 smp_mb__after_atomic_inc();
1583 spin_unlock(&dev->se_port_lock);
1584
1585 ret = core_scsi3_tpg_depend_item(tmp_tpg);
1586 if (ret != 0) {
1587 printk(KERN_ERR " core_scsi3_tpg_depend_item()"
1588 " for tmp_tpg\n");
1589 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1590 smp_mb__after_atomic_dec();
1591 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1592 goto out;
1593 }
1594 /*
1595 * Locate the desination initiator ACL to be registered
1596 * from the decoded fabric module specific TransportID
1597 * at *i_str.
1598 */
1599 spin_lock_bh(&tmp_tpg->acl_node_lock);
1600 dest_node_acl = __core_tpg_get_initiator_node_acl(
1601 tmp_tpg, i_str);
1602 if (dest_node_acl) {
1603 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1604 smp_mb__after_atomic_inc();
1605 }
1606 spin_unlock_bh(&tmp_tpg->acl_node_lock);
1607
1608 if (!(dest_node_acl)) {
1609 core_scsi3_tpg_undepend_item(tmp_tpg);
1610 spin_lock(&dev->se_port_lock);
1611 continue;
1612 }
1613
1614 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1615 if (ret != 0) {
1616 printk(KERN_ERR "configfs_depend_item() failed"
1617 " for dest_node_acl->acl_group\n");
1618 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1619 smp_mb__after_atomic_dec();
1620 core_scsi3_tpg_undepend_item(tmp_tpg);
1621 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1622 goto out;
1623 }
1624
1625 dest_tpg = tmp_tpg;
1626 printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node:"
1627 " %s Port RTPI: %hu\n",
1628 TPG_TFO(dest_tpg)->get_fabric_name(),
1629 dest_node_acl->initiatorname, dest_rtpi);
1630
1631 spin_lock(&dev->se_port_lock);
1632 break;
1633 }
1634 spin_unlock(&dev->se_port_lock);
1635
1636 if (!(dest_tpg)) {
1637 printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Unable to locate"
1638 " dest_tpg\n");
1639 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1640 goto out;
1641 }
1642 #if 0
1643 printk("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1644 " tid_len: %d for %s + %s\n",
1645 TPG_TFO(dest_tpg)->get_fabric_name(), cmd->data_length,
1646 tpdl, tid_len, i_str, iport_ptr);
1647 #endif
1648 if (tid_len > tpdl) {
1649 printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1650 " %u for Transport ID: %s\n", tid_len, ptr);
1651 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1652 core_scsi3_tpg_undepend_item(dest_tpg);
1653 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1654 goto out;
1655 }
1656 /*
1657 * Locate the desintation struct se_dev_entry pointer for matching
1658 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1659 * Target Port.
1660 */
1661 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1662 dest_rtpi);
1663 if (!(dest_se_deve)) {
1664 printk(KERN_ERR "Unable to locate %s dest_se_deve"
1665 " from destination RTPI: %hu\n",
1666 TPG_TFO(dest_tpg)->get_fabric_name(),
1667 dest_rtpi);
1668
1669 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1670 core_scsi3_tpg_undepend_item(dest_tpg);
1671 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1672 goto out;
1673 }
1674
1675 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1676 if (ret < 0) {
1677 printk(KERN_ERR "core_scsi3_lunacl_depend_item()"
1678 " failed\n");
1679 atomic_dec(&dest_se_deve->pr_ref_count);
1680 smp_mb__after_atomic_dec();
1681 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1682 core_scsi3_tpg_undepend_item(dest_tpg);
1683 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1684 goto out;
1685 }
1686 #if 0
1687 printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1688 " dest_se_deve mapped_lun: %u\n",
1689 TPG_TFO(dest_tpg)->get_fabric_name(),
1690 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1691 #endif
1692 /*
1693 * Skip any TransportIDs that already have a registration for
1694 * this target port.
1695 */
1696 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1697 iport_ptr);
1698 if (pr_reg_e) {
1699 core_scsi3_put_pr_reg(pr_reg_e);
1700 core_scsi3_lunacl_undepend_item(dest_se_deve);
1701 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1702 core_scsi3_tpg_undepend_item(dest_tpg);
1703 ptr += tid_len;
1704 tpdl -= tid_len;
1705 tid_len = 0;
1706 continue;
1707 }
1708 /*
1709 * Allocate a struct pr_transport_id_holder and setup
1710 * the dest_node_acl and dest_se_deve pointers for the
1711 * loop below.
1712 */
1713 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1714 GFP_KERNEL);
1715 if (!(tidh_new)) {
1716 printk(KERN_ERR "Unable to allocate tidh_new\n");
1717 core_scsi3_lunacl_undepend_item(dest_se_deve);
1718 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1719 core_scsi3_tpg_undepend_item(dest_tpg);
1720 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1721 goto out;
1722 }
1723 INIT_LIST_HEAD(&tidh_new->dest_list);
1724 tidh_new->dest_tpg = dest_tpg;
1725 tidh_new->dest_node_acl = dest_node_acl;
1726 tidh_new->dest_se_deve = dest_se_deve;
1727
1728 /*
1729 * Allocate, but do NOT add the registration for the
1730 * TransportID referenced SCSI Initiator port. This
1731 * done because of the following from spc4r17 in section
1732 * 6.14.3 wrt SPEC_I_PT:
1733 *
1734 * "If a registration fails for any initiator port (e.g., if th
1735 * logical unit does not have enough resources available to
1736 * hold the registration information), no registrations shall be
1737 * made, and the command shall be terminated with
1738 * CHECK CONDITION status."
1739 *
1740 * That means we call __core_scsi3_alloc_registration() here,
1741 * and then call __core_scsi3_add_registration() in the
1742 * 2nd loop which will never fail.
1743 */
1744 dest_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
1745 dest_node_acl, dest_se_deve, iport_ptr,
1746 sa_res_key, all_tg_pt, aptpl);
1747 if (!(dest_pr_reg)) {
1748 core_scsi3_lunacl_undepend_item(dest_se_deve);
1749 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1750 core_scsi3_tpg_undepend_item(dest_tpg);
1751 kfree(tidh_new);
1752 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1753 goto out;
1754 }
1755 tidh_new->dest_pr_reg = dest_pr_reg;
1756 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1757
1758 ptr += tid_len;
1759 tpdl -= tid_len;
1760 tid_len = 0;
1761
1762 }
1763 /*
1764 * Go ahead and create a registrations from tid_dest_list for the
1765 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1766 * and dest_se_deve.
1767 *
1768 * The SA Reservation Key from the PROUT is set for the
1769 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1770 * means that the TransportID Initiator port will be
1771 * registered on all of the target ports in the SCSI target device
1772 * ALL_TG_PT=0 means the registration will only be for the
1773 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1774 * was received.
1775 */
1776 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1777 dest_tpg = tidh->dest_tpg;
1778 dest_node_acl = tidh->dest_node_acl;
1779 dest_se_deve = tidh->dest_se_deve;
1780 dest_pr_reg = tidh->dest_pr_reg;
1781 dest_local_nexus = tidh->dest_local_nexus;
1782
1783 list_del(&tidh->dest_list);
1784 kfree(tidh);
1785
1786 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1787 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1788 PR_REG_ISID_ID_LEN);
1789
1790 __core_scsi3_add_registration(SE_DEV(cmd), dest_node_acl,
1791 dest_pr_reg, 0, 0);
1792
1793 printk(KERN_INFO "SPC-3 PR [%s] SPEC_I_PT: Successfully"
1794 " registered Transport ID for Node: %s%s Mapped LUN:"
1795 " %u\n", TPG_TFO(dest_tpg)->get_fabric_name(),
1796 dest_node_acl->initiatorname, (prf_isid) ?
1797 &i_buf[0] : "", dest_se_deve->mapped_lun);
1798
1799 if (dest_local_nexus)
1800 continue;
1801
1802 core_scsi3_lunacl_undepend_item(dest_se_deve);
1803 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1804 core_scsi3_tpg_undepend_item(dest_tpg);
1805 }
1806
1807 return 0;
1808 out:
1809 /*
1810 * For the failure case, release everything from tid_dest_list
1811 * including *dest_pr_reg and the configfs dependances..
1812 */
1813 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1814 dest_tpg = tidh->dest_tpg;
1815 dest_node_acl = tidh->dest_node_acl;
1816 dest_se_deve = tidh->dest_se_deve;
1817 dest_pr_reg = tidh->dest_pr_reg;
1818 dest_local_nexus = tidh->dest_local_nexus;
1819
1820 list_del(&tidh->dest_list);
1821 kfree(tidh);
1822 /*
1823 * Release any extra ALL_TG_PT=1 registrations for
1824 * the SPEC_I_PT=1 case.
1825 */
1826 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1827 &dest_pr_reg->pr_reg_atp_list,
1828 pr_reg_atp_mem_list) {
1829 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1830 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1831 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1832 }
1833
1834 kfree(dest_pr_reg->pr_aptpl_buf);
1835 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1836
1837 if (dest_local_nexus)
1838 continue;
1839
1840 core_scsi3_lunacl_undepend_item(dest_se_deve);
1841 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1842 core_scsi3_tpg_undepend_item(dest_tpg);
1843 }
1844 return ret;
1845 }
1846
1847 /*
1848 * Called with struct se_device->dev_reservation_lock held
1849 */
1850 static int __core_scsi3_update_aptpl_buf(
1851 struct se_device *dev,
1852 unsigned char *buf,
1853 u32 pr_aptpl_buf_len,
1854 int clear_aptpl_metadata)
1855 {
1856 struct se_lun *lun;
1857 struct se_portal_group *tpg;
1858 struct se_subsystem_dev *su_dev = SU_DEV(dev);
1859 struct t10_pr_registration *pr_reg;
1860 unsigned char tmp[512], isid_buf[32];
1861 ssize_t len = 0;
1862 int reg_count = 0;
1863
1864 memset(buf, 0, pr_aptpl_buf_len);
1865 /*
1866 * Called to clear metadata once APTPL has been deactivated.
1867 */
1868 if (clear_aptpl_metadata) {
1869 snprintf(buf, pr_aptpl_buf_len,
1870 "No Registrations or Reservations\n");
1871 return 0;
1872 }
1873 /*
1874 * Walk the registration list..
1875 */
1876 spin_lock(&T10_RES(su_dev)->registration_lock);
1877 list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
1878 pr_reg_list) {
1879
1880 tmp[0] = '\0';
1881 isid_buf[0] = '\0';
1882 tpg = pr_reg->pr_reg_nacl->se_tpg;
1883 lun = pr_reg->pr_reg_tg_pt_lun;
1884 /*
1885 * Write out any ISID value to APTPL metadata that was included
1886 * in the original registration.
1887 */
1888 if (pr_reg->isid_present_at_reg)
1889 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1890 pr_reg->pr_reg_isid);
1891 /*
1892 * Include special metadata if the pr_reg matches the
1893 * reservation holder.
1894 */
1895 if (dev->dev_pr_res_holder == pr_reg) {
1896 snprintf(tmp, 512, "PR_REG_START: %d"
1897 "\ninitiator_fabric=%s\n"
1898 "initiator_node=%s\n%s"
1899 "sa_res_key=%llu\n"
1900 "res_holder=1\nres_type=%02x\n"
1901 "res_scope=%02x\nres_all_tg_pt=%d\n"
1902 "mapped_lun=%u\n", reg_count,
1903 TPG_TFO(tpg)->get_fabric_name(),
1904 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1905 pr_reg->pr_res_key, pr_reg->pr_res_type,
1906 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1907 pr_reg->pr_res_mapped_lun);
1908 } else {
1909 snprintf(tmp, 512, "PR_REG_START: %d\n"
1910 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1911 "sa_res_key=%llu\nres_holder=0\n"
1912 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1913 reg_count, TPG_TFO(tpg)->get_fabric_name(),
1914 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1915 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1916 pr_reg->pr_res_mapped_lun);
1917 }
1918
1919 if ((len + strlen(tmp) > pr_aptpl_buf_len)) {
1920 printk(KERN_ERR "Unable to update renaming"
1921 " APTPL metadata\n");
1922 spin_unlock(&T10_RES(su_dev)->registration_lock);
1923 return -1;
1924 }
1925 len += sprintf(buf+len, "%s", tmp);
1926
1927 /*
1928 * Include information about the associated SCSI target port.
1929 */
1930 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1931 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1932 " %d\n", TPG_TFO(tpg)->get_fabric_name(),
1933 TPG_TFO(tpg)->tpg_get_wwn(tpg),
1934 TPG_TFO(tpg)->tpg_get_tag(tpg),
1935 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1936
1937 if ((len + strlen(tmp) > pr_aptpl_buf_len)) {
1938 printk(KERN_ERR "Unable to update renaming"
1939 " APTPL metadata\n");
1940 spin_unlock(&T10_RES(su_dev)->registration_lock);
1941 return -1;
1942 }
1943 len += sprintf(buf+len, "%s", tmp);
1944 reg_count++;
1945 }
1946 spin_unlock(&T10_RES(su_dev)->registration_lock);
1947
1948 if (!(reg_count))
1949 len += sprintf(buf+len, "No Registrations or Reservations");
1950
1951 return 0;
1952 }
1953
1954 static int core_scsi3_update_aptpl_buf(
1955 struct se_device *dev,
1956 unsigned char *buf,
1957 u32 pr_aptpl_buf_len,
1958 int clear_aptpl_metadata)
1959 {
1960 int ret;
1961
1962 spin_lock(&dev->dev_reservation_lock);
1963 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1964 clear_aptpl_metadata);
1965 spin_unlock(&dev->dev_reservation_lock);
1966
1967 return ret;
1968 }
1969
1970 /*
1971 * Called with struct se_device->aptpl_file_mutex held
1972 */
1973 static int __core_scsi3_write_aptpl_to_file(
1974 struct se_device *dev,
1975 unsigned char *buf,
1976 u32 pr_aptpl_buf_len)
1977 {
1978 struct t10_wwn *wwn = &SU_DEV(dev)->t10_wwn;
1979 struct file *file;
1980 struct iovec iov[1];
1981 mm_segment_t old_fs;
1982 int flags = O_RDWR | O_CREAT | O_TRUNC;
1983 char path[512];
1984 int ret;
1985
1986 memset(iov, 0, sizeof(struct iovec));
1987 memset(path, 0, 512);
1988
1989 if (strlen(&wwn->unit_serial[0]) > 512) {
1990 printk(KERN_ERR "WWN value for struct se_device does not fit"
1991 " into path buffer\n");
1992 return -1;
1993 }
1994
1995 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1996 file = filp_open(path, flags, 0600);
1997 if (IS_ERR(file) || !file || !file->f_dentry) {
1998 printk(KERN_ERR "filp_open(%s) for APTPL metadata"
1999 " failed\n", path);
2000 return -1;
2001 }
2002
2003 iov[0].iov_base = &buf[0];
2004 if (!(pr_aptpl_buf_len))
2005 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2006 else
2007 iov[0].iov_len = pr_aptpl_buf_len;
2008
2009 old_fs = get_fs();
2010 set_fs(get_ds());
2011 ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2012 set_fs(old_fs);
2013
2014 if (ret < 0) {
2015 printk("Error writing APTPL metadata file: %s\n", path);
2016 filp_close(file, NULL);
2017 return -1;
2018 }
2019 filp_close(file, NULL);
2020
2021 return 0;
2022 }
2023
2024 static int core_scsi3_update_and_write_aptpl(
2025 struct se_device *dev,
2026 unsigned char *in_buf,
2027 u32 in_pr_aptpl_buf_len)
2028 {
2029 unsigned char null_buf[64], *buf;
2030 u32 pr_aptpl_buf_len;
2031 int ret, clear_aptpl_metadata = 0;
2032 /*
2033 * Can be called with a NULL pointer from PROUT service action CLEAR
2034 */
2035 if (!(in_buf)) {
2036 memset(null_buf, 0, 64);
2037 buf = &null_buf[0];
2038 /*
2039 * This will clear the APTPL metadata to:
2040 * "No Registrations or Reservations" status
2041 */
2042 pr_aptpl_buf_len = 64;
2043 clear_aptpl_metadata = 1;
2044 } else {
2045 buf = in_buf;
2046 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2047 }
2048
2049 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2050 clear_aptpl_metadata);
2051 if (ret != 0)
2052 return -1;
2053 /*
2054 * __core_scsi3_write_aptpl_to_file() will call strlen()
2055 * on the passed buf to determine pr_aptpl_buf_len.
2056 */
2057 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2058 if (ret != 0)
2059 return -1;
2060
2061 return ret;
2062 }
2063
2064 static int core_scsi3_emulate_pro_register(
2065 struct se_cmd *cmd,
2066 u64 res_key,
2067 u64 sa_res_key,
2068 int aptpl,
2069 int all_tg_pt,
2070 int spec_i_pt,
2071 int ignore_key)
2072 {
2073 struct se_session *se_sess = SE_SESS(cmd);
2074 struct se_device *dev = SE_DEV(cmd);
2075 struct se_dev_entry *se_deve;
2076 struct se_lun *se_lun = SE_LUN(cmd);
2077 struct se_portal_group *se_tpg;
2078 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2079 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2080 /* Used for APTPL metadata w/ UNREGISTER */
2081 unsigned char *pr_aptpl_buf = NULL;
2082 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2083 int pr_holder = 0, ret = 0, type;
2084
2085 if (!(se_sess) || !(se_lun)) {
2086 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2087 return PYX_TRANSPORT_LU_COMM_FAILURE;
2088 }
2089 se_tpg = se_sess->se_tpg;
2090 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2091
2092 if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
2093 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2094 TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, &isid_buf[0],
2095 PR_REG_ISID_LEN);
2096 isid_ptr = &isid_buf[0];
2097 }
2098 /*
2099 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2100 */
2101 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2102 if (!(pr_reg_e)) {
2103 if (res_key) {
2104 printk(KERN_WARNING "SPC-3 PR: Reservation Key non-zero"
2105 " for SA REGISTER, returning CONFLICT\n");
2106 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2107 }
2108 /*
2109 * Do nothing but return GOOD status.
2110 */
2111 if (!(sa_res_key))
2112 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2113
2114 if (!(spec_i_pt)) {
2115 /*
2116 * Perform the Service Action REGISTER on the Initiator
2117 * Port Endpoint that the PRO was received from on the
2118 * Logical Unit of the SCSI device server.
2119 */
2120 ret = core_scsi3_alloc_registration(SE_DEV(cmd),
2121 se_sess->se_node_acl, se_deve, isid_ptr,
2122 sa_res_key, all_tg_pt, aptpl,
2123 ignore_key, 0);
2124 if (ret != 0) {
2125 printk(KERN_ERR "Unable to allocate"
2126 " struct t10_pr_registration\n");
2127 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2128 }
2129 } else {
2130 /*
2131 * Register both the Initiator port that received
2132 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2133 * TransportID from Parameter list and loop through
2134 * fabric dependent parameter list while calling
2135 * logic from of core_scsi3_alloc_registration() for
2136 * each TransportID provided SCSI Initiator Port/Device
2137 */
2138 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2139 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2140 if (ret != 0)
2141 return ret;
2142 }
2143 /*
2144 * Nothing left to do for the APTPL=0 case.
2145 */
2146 if (!(aptpl)) {
2147 pr_tmpl->pr_aptpl_active = 0;
2148 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
2149 printk("SPC-3 PR: Set APTPL Bit Deactivated for"
2150 " REGISTER\n");
2151 return 0;
2152 }
2153 /*
2154 * Locate the newly allocated local I_T Nexus *pr_reg, and
2155 * update the APTPL metadata information using its
2156 * preallocated *pr_reg->pr_aptpl_buf.
2157 */
2158 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd),
2159 se_sess->se_node_acl, se_sess);
2160
2161 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2162 &pr_reg->pr_aptpl_buf[0],
2163 pr_tmpl->pr_aptpl_buf_len);
2164 if (!(ret)) {
2165 pr_tmpl->pr_aptpl_active = 1;
2166 printk("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2167 }
2168
2169 core_scsi3_put_pr_reg(pr_reg);
2170 return ret;
2171 } else {
2172 /*
2173 * Locate the existing *pr_reg via struct se_node_acl pointers
2174 */
2175 pr_reg = pr_reg_e;
2176 type = pr_reg->pr_res_type;
2177
2178 if (!(ignore_key)) {
2179 if (res_key != pr_reg->pr_res_key) {
2180 printk(KERN_ERR "SPC-3 PR REGISTER: Received"
2181 " res_key: 0x%016Lx does not match"
2182 " existing SA REGISTER res_key:"
2183 " 0x%016Lx\n", res_key,
2184 pr_reg->pr_res_key);
2185 core_scsi3_put_pr_reg(pr_reg);
2186 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2187 }
2188 }
2189 if (spec_i_pt) {
2190 printk(KERN_ERR "SPC-3 PR UNREGISTER: SPEC_I_PT"
2191 " set while sa_res_key=0\n");
2192 core_scsi3_put_pr_reg(pr_reg);
2193 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2194 }
2195 /*
2196 * An existing ALL_TG_PT=1 registration being released
2197 * must also set ALL_TG_PT=1 in the incoming PROUT.
2198 */
2199 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2200 printk(KERN_ERR "SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2201 " registration exists, but ALL_TG_PT=1 bit not"
2202 " present in received PROUT\n");
2203 core_scsi3_put_pr_reg(pr_reg);
2204 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2205 }
2206 /*
2207 * Allocate APTPL metadata buffer used for UNREGISTER ops
2208 */
2209 if (aptpl) {
2210 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2211 GFP_KERNEL);
2212 if (!(pr_aptpl_buf)) {
2213 printk(KERN_ERR "Unable to allocate"
2214 " pr_aptpl_buf\n");
2215 core_scsi3_put_pr_reg(pr_reg);
2216 return PYX_TRANSPORT_LU_COMM_FAILURE;
2217 }
2218 }
2219 /*
2220 * sa_res_key=0 Unregister Reservation Key for registered I_T
2221 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2222 * Nexus.
2223 */
2224 if (!(sa_res_key)) {
2225 pr_holder = core_scsi3_check_implict_release(
2226 SE_DEV(cmd), pr_reg);
2227 if (pr_holder < 0) {
2228 kfree(pr_aptpl_buf);
2229 core_scsi3_put_pr_reg(pr_reg);
2230 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2231 }
2232
2233 spin_lock(&pr_tmpl->registration_lock);
2234 /*
2235 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2236 * and matching pr_res_key.
2237 */
2238 if (pr_reg->pr_reg_all_tg_pt) {
2239 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2240 &pr_tmpl->registration_list,
2241 pr_reg_list) {
2242
2243 if (!(pr_reg_p->pr_reg_all_tg_pt))
2244 continue;
2245
2246 if (pr_reg_p->pr_res_key != res_key)
2247 continue;
2248
2249 if (pr_reg == pr_reg_p)
2250 continue;
2251
2252 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2253 pr_reg_p->pr_reg_nacl->initiatorname))
2254 continue;
2255
2256 __core_scsi3_free_registration(dev,
2257 pr_reg_p, NULL, 0);
2258 }
2259 }
2260 /*
2261 * Release the calling I_T Nexus registration now..
2262 */
2263 __core_scsi3_free_registration(SE_DEV(cmd), pr_reg,
2264 NULL, 1);
2265 /*
2266 * From spc4r17, section 5.7.11.3 Unregistering
2267 *
2268 * If the persistent reservation is a registrants only
2269 * type, the device server shall establish a unit
2270 * attention condition for the initiator port associated
2271 * with every registered I_T nexus except for the I_T
2272 * nexus on which the PERSISTENT RESERVE OUT command was
2273 * received, with the additional sense code set to
2274 * RESERVATIONS RELEASED.
2275 */
2276 if (pr_holder &&
2277 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2278 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2279 list_for_each_entry(pr_reg_p,
2280 &pr_tmpl->registration_list,
2281 pr_reg_list) {
2282
2283 core_scsi3_ua_allocate(
2284 pr_reg_p->pr_reg_nacl,
2285 pr_reg_p->pr_res_mapped_lun,
2286 0x2A,
2287 ASCQ_2AH_RESERVATIONS_RELEASED);
2288 }
2289 }
2290 spin_unlock(&pr_tmpl->registration_lock);
2291
2292 if (!(aptpl)) {
2293 pr_tmpl->pr_aptpl_active = 0;
2294 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2295 printk("SPC-3 PR: Set APTPL Bit Deactivated"
2296 " for UNREGISTER\n");
2297 return 0;
2298 }
2299
2300 ret = core_scsi3_update_and_write_aptpl(dev,
2301 &pr_aptpl_buf[0],
2302 pr_tmpl->pr_aptpl_buf_len);
2303 if (!(ret)) {
2304 pr_tmpl->pr_aptpl_active = 1;
2305 printk("SPC-3 PR: Set APTPL Bit Activated"
2306 " for UNREGISTER\n");
2307 }
2308
2309 kfree(pr_aptpl_buf);
2310 return ret;
2311 } else {
2312 /*
2313 * Increment PRgeneration counter for struct se_device"
2314 * upon a successful REGISTER, see spc4r17 section 6.3.2
2315 * READ_KEYS service action.
2316 */
2317 pr_reg->pr_res_generation = core_scsi3_pr_generation(
2318 SE_DEV(cmd));
2319 pr_reg->pr_res_key = sa_res_key;
2320 printk("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2321 " Key for %s to: 0x%016Lx PRgeneration:"
2322 " 0x%08x\n", CMD_TFO(cmd)->get_fabric_name(),
2323 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2324 pr_reg->pr_reg_nacl->initiatorname,
2325 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2326
2327 if (!(aptpl)) {
2328 pr_tmpl->pr_aptpl_active = 0;
2329 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2330 core_scsi3_put_pr_reg(pr_reg);
2331 printk("SPC-3 PR: Set APTPL Bit Deactivated"
2332 " for REGISTER\n");
2333 return 0;
2334 }
2335
2336 ret = core_scsi3_update_and_write_aptpl(dev,
2337 &pr_aptpl_buf[0],
2338 pr_tmpl->pr_aptpl_buf_len);
2339 if (!(ret)) {
2340 pr_tmpl->pr_aptpl_active = 1;
2341 printk("SPC-3 PR: Set APTPL Bit Activated"
2342 " for REGISTER\n");
2343 }
2344
2345 kfree(pr_aptpl_buf);
2346 core_scsi3_put_pr_reg(pr_reg);
2347 }
2348 }
2349 return 0;
2350 }
2351
2352 unsigned char *core_scsi3_pr_dump_type(int type)
2353 {
2354 switch (type) {
2355 case PR_TYPE_WRITE_EXCLUSIVE:
2356 return "Write Exclusive Access";
2357 case PR_TYPE_EXCLUSIVE_ACCESS:
2358 return "Exclusive Access";
2359 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2360 return "Write Exclusive Access, Registrants Only";
2361 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2362 return "Exclusive Access, Registrants Only";
2363 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2364 return "Write Exclusive Access, All Registrants";
2365 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2366 return "Exclusive Access, All Registrants";
2367 default:
2368 break;
2369 }
2370
2371 return "Unknown SPC-3 PR Type";
2372 }
2373
2374 static int core_scsi3_pro_reserve(
2375 struct se_cmd *cmd,
2376 struct se_device *dev,
2377 int type,
2378 int scope,
2379 u64 res_key)
2380 {
2381 struct se_session *se_sess = SE_SESS(cmd);
2382 struct se_dev_entry *se_deve;
2383 struct se_lun *se_lun = SE_LUN(cmd);
2384 struct se_portal_group *se_tpg;
2385 struct t10_pr_registration *pr_reg, *pr_res_holder;
2386 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2387 char i_buf[PR_REG_ISID_ID_LEN];
2388 int ret, prf_isid;
2389
2390 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2391
2392 if (!(se_sess) || !(se_lun)) {
2393 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2394 return PYX_TRANSPORT_LU_COMM_FAILURE;
2395 }
2396 se_tpg = se_sess->se_tpg;
2397 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2398 /*
2399 * Locate the existing *pr_reg via struct se_node_acl pointers
2400 */
2401 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
2402 se_sess);
2403 if (!(pr_reg)) {
2404 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2405 " PR_REGISTERED *pr_reg for RESERVE\n");
2406 return PYX_TRANSPORT_LU_COMM_FAILURE;
2407 }
2408 /*
2409 * From spc4r17 Section 5.7.9: Reserving:
2410 *
2411 * An application client creates a persistent reservation by issuing
2412 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2413 * a registered I_T nexus with the following parameters:
2414 * a) RESERVATION KEY set to the value of the reservation key that is
2415 * registered with the logical unit for the I_T nexus; and
2416 */
2417 if (res_key != pr_reg->pr_res_key) {
2418 printk(KERN_ERR "SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2419 " does not match existing SA REGISTER res_key:"
2420 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2421 core_scsi3_put_pr_reg(pr_reg);
2422 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2423 }
2424 /*
2425 * From spc4r17 Section 5.7.9: Reserving:
2426 *
2427 * From above:
2428 * b) TYPE field and SCOPE field set to the persistent reservation
2429 * being created.
2430 *
2431 * Only one persistent reservation is allowed at a time per logical unit
2432 * and that persistent reservation has a scope of LU_SCOPE.
2433 */
2434 if (scope != PR_SCOPE_LU_SCOPE) {
2435 printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2436 core_scsi3_put_pr_reg(pr_reg);
2437 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2438 }
2439 /*
2440 * See if we have an existing PR reservation holder pointer at
2441 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2442 * *pr_res_holder.
2443 */
2444 spin_lock(&dev->dev_reservation_lock);
2445 pr_res_holder = dev->dev_pr_res_holder;
2446 if ((pr_res_holder)) {
2447 /*
2448 * From spc4r17 Section 5.7.9: Reserving:
2449 *
2450 * If the device server receives a PERSISTENT RESERVE OUT
2451 * command from an I_T nexus other than a persistent reservation
2452 * holder (see 5.7.10) that attempts to create a persistent
2453 * reservation when a persistent reservation already exists for
2454 * the logical unit, then the command shall be completed with
2455 * RESERVATION CONFLICT status.
2456 */
2457 if (pr_res_holder != pr_reg) {
2458 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2459 printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
2460 " [%s]: %s while reservation already held by"
2461 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2462 CMD_TFO(cmd)->get_fabric_name(),
2463 se_sess->se_node_acl->initiatorname,
2464 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2465 pr_res_holder->pr_reg_nacl->initiatorname);
2466
2467 spin_unlock(&dev->dev_reservation_lock);
2468 core_scsi3_put_pr_reg(pr_reg);
2469 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2470 }
2471 /*
2472 * From spc4r17 Section 5.7.9: Reserving:
2473 *
2474 * If a persistent reservation holder attempts to modify the
2475 * type or scope of an existing persistent reservation, the
2476 * command shall be completed with RESERVATION CONFLICT status.
2477 */
2478 if ((pr_res_holder->pr_res_type != type) ||
2479 (pr_res_holder->pr_res_scope != scope)) {
2480 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2481 printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
2482 " [%s]: %s trying to change TYPE and/or SCOPE,"
2483 " while reservation already held by [%s]: %s,"
2484 " returning RESERVATION_CONFLICT\n",
2485 CMD_TFO(cmd)->get_fabric_name(),
2486 se_sess->se_node_acl->initiatorname,
2487 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2488 pr_res_holder->pr_reg_nacl->initiatorname);
2489
2490 spin_unlock(&dev->dev_reservation_lock);
2491 core_scsi3_put_pr_reg(pr_reg);
2492 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2493 }
2494 /*
2495 * From spc4r17 Section 5.7.9: Reserving:
2496 *
2497 * If the device server receives a PERSISTENT RESERVE OUT
2498 * command with RESERVE service action where the TYPE field and
2499 * the SCOPE field contain the same values as the existing type
2500 * and scope from a persistent reservation holder, it shall not
2501 * make any change to the existing persistent reservation and
2502 * shall completethe command with GOOD status.
2503 */
2504 spin_unlock(&dev->dev_reservation_lock);
2505 core_scsi3_put_pr_reg(pr_reg);
2506 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2507 }
2508 /*
2509 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2510 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2511 */
2512 pr_reg->pr_res_scope = scope;
2513 pr_reg->pr_res_type = type;
2514 pr_reg->pr_res_holder = 1;
2515 dev->dev_pr_res_holder = pr_reg;
2516 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2517 PR_REG_ISID_ID_LEN);
2518
2519 printk(KERN_INFO "SPC-3 PR [%s] Service Action: RESERVE created new"
2520 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2521 CMD_TFO(cmd)->get_fabric_name(), core_scsi3_pr_dump_type(type),
2522 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2523 printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
2524 CMD_TFO(cmd)->get_fabric_name(),
2525 se_sess->se_node_acl->initiatorname,
2526 (prf_isid) ? &i_buf[0] : "");
2527 spin_unlock(&dev->dev_reservation_lock);
2528
2529 if (pr_tmpl->pr_aptpl_active) {
2530 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2531 &pr_reg->pr_aptpl_buf[0],
2532 pr_tmpl->pr_aptpl_buf_len);
2533 if (!(ret))
2534 printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
2535 " for RESERVE\n");
2536 }
2537
2538 core_scsi3_put_pr_reg(pr_reg);
2539 return 0;
2540 }
2541
2542 static int core_scsi3_emulate_pro_reserve(
2543 struct se_cmd *cmd,
2544 int type,
2545 int scope,
2546 u64 res_key)
2547 {
2548 struct se_device *dev = cmd->se_dev;
2549 int ret = 0;
2550
2551 switch (type) {
2552 case PR_TYPE_WRITE_EXCLUSIVE:
2553 case PR_TYPE_EXCLUSIVE_ACCESS:
2554 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2555 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2556 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2557 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2558 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2559 break;
2560 default:
2561 printk(KERN_ERR "SPC-3 PR: Unknown Service Action RESERVE Type:"
2562 " 0x%02x\n", type);
2563 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2564 }
2565
2566 return ret;
2567 }
2568
2569 /*
2570 * Called with struct se_device->dev_reservation_lock held.
2571 */
2572 static void __core_scsi3_complete_pro_release(
2573 struct se_device *dev,
2574 struct se_node_acl *se_nacl,
2575 struct t10_pr_registration *pr_reg,
2576 int explict)
2577 {
2578 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2579 char i_buf[PR_REG_ISID_ID_LEN];
2580 int prf_isid;
2581
2582 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2583 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2584 PR_REG_ISID_ID_LEN);
2585 /*
2586 * Go ahead and release the current PR reservation holder.
2587 */
2588 dev->dev_pr_res_holder = NULL;
2589
2590 printk(KERN_INFO "SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2591 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2592 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2593 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2594 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2595 printk(KERN_INFO "SPC-3 PR [%s] RELEASE Node: %s%s\n",
2596 tfo->get_fabric_name(), se_nacl->initiatorname,
2597 (prf_isid) ? &i_buf[0] : "");
2598 /*
2599 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2600 */
2601 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2602 }
2603
2604 static int core_scsi3_emulate_pro_release(
2605 struct se_cmd *cmd,
2606 int type,
2607 int scope,
2608 u64 res_key)
2609 {
2610 struct se_device *dev = cmd->se_dev;
2611 struct se_session *se_sess = SE_SESS(cmd);
2612 struct se_lun *se_lun = SE_LUN(cmd);
2613 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2614 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2615 int ret, all_reg = 0;
2616
2617 if (!(se_sess) || !(se_lun)) {
2618 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2619 return PYX_TRANSPORT_LU_COMM_FAILURE;
2620 }
2621 /*
2622 * Locate the existing *pr_reg via struct se_node_acl pointers
2623 */
2624 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2625 if (!(pr_reg)) {
2626 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2627 " PR_REGISTERED *pr_reg for RELEASE\n");
2628 return PYX_TRANSPORT_LU_COMM_FAILURE;
2629 }
2630 /*
2631 * From spc4r17 Section 5.7.11.2 Releasing:
2632 *
2633 * If there is no persistent reservation or in response to a persistent
2634 * reservation release request from a registered I_T nexus that is not a
2635 * persistent reservation holder (see 5.7.10), the device server shall
2636 * do the following:
2637 *
2638 * a) Not release the persistent reservation, if any;
2639 * b) Not remove any registrations; and
2640 * c) Complete the command with GOOD status.
2641 */
2642 spin_lock(&dev->dev_reservation_lock);
2643 pr_res_holder = dev->dev_pr_res_holder;
2644 if (!(pr_res_holder)) {
2645 /*
2646 * No persistent reservation, return GOOD status.
2647 */
2648 spin_unlock(&dev->dev_reservation_lock);
2649 core_scsi3_put_pr_reg(pr_reg);
2650 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2651 }
2652 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2653 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2654 all_reg = 1;
2655
2656 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2657 /*
2658 * Non 'All Registrants' PR Type cases..
2659 * Release request from a registered I_T nexus that is not a
2660 * persistent reservation holder. return GOOD status.
2661 */
2662 spin_unlock(&dev->dev_reservation_lock);
2663 core_scsi3_put_pr_reg(pr_reg);
2664 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2665 }
2666 /*
2667 * From spc4r17 Section 5.7.11.2 Releasing:
2668 *
2669 * Only the persistent reservation holder (see 5.7.10) is allowed to
2670 * release a persistent reservation.
2671 *
2672 * An application client releases the persistent reservation by issuing
2673 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2674 * an I_T nexus that is a persistent reservation holder with the
2675 * following parameters:
2676 *
2677 * a) RESERVATION KEY field set to the value of the reservation key
2678 * that is registered with the logical unit for the I_T nexus;
2679 */
2680 if (res_key != pr_reg->pr_res_key) {
2681 printk(KERN_ERR "SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2682 " does not match existing SA REGISTER res_key:"
2683 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2684 spin_unlock(&dev->dev_reservation_lock);
2685 core_scsi3_put_pr_reg(pr_reg);
2686 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2687 }
2688 /*
2689 * From spc4r17 Section 5.7.11.2 Releasing and above:
2690 *
2691 * b) TYPE field and SCOPE field set to match the persistent
2692 * reservation being released.
2693 */
2694 if ((pr_res_holder->pr_res_type != type) ||
2695 (pr_res_holder->pr_res_scope != scope)) {
2696 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2697 printk(KERN_ERR "SPC-3 PR RELEASE: Attempted to release"
2698 " reservation from [%s]: %s with different TYPE "
2699 "and/or SCOPE while reservation already held by"
2700 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2701 CMD_TFO(cmd)->get_fabric_name(),
2702 se_sess->se_node_acl->initiatorname,
2703 TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
2704 pr_res_holder->pr_reg_nacl->initiatorname);
2705
2706 spin_unlock(&dev->dev_reservation_lock);
2707 core_scsi3_put_pr_reg(pr_reg);
2708 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2709 }
2710 /*
2711 * In response to a persistent reservation release request from the
2712 * persistent reservation holder the device server shall perform a
2713 * release by doing the following as an uninterrupted series of actions:
2714 * a) Release the persistent reservation;
2715 * b) Not remove any registration(s);
2716 * c) If the released persistent reservation is a registrants only type
2717 * or all registrants type persistent reservation,
2718 * the device server shall establish a unit attention condition for
2719 * the initiator port associated with every regis-
2720 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2721 * RESERVE OUT command with RELEASE service action was received,
2722 * with the additional sense code set to RESERVATIONS RELEASED; and
2723 * d) If the persistent reservation is of any other type, the device
2724 * server shall not establish a unit attention condition.
2725 */
2726 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2727 pr_reg, 1);
2728
2729 spin_unlock(&dev->dev_reservation_lock);
2730
2731 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2732 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2733 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2734 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2735 /*
2736 * If no UNIT ATTENTION conditions will be established for
2737 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2738 * go ahead and check for APTPL=1 update+write below
2739 */
2740 goto write_aptpl;
2741 }
2742
2743 spin_lock(&pr_tmpl->registration_lock);
2744 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2745 pr_reg_list) {
2746 /*
2747 * Do not establish a UNIT ATTENTION condition
2748 * for the calling I_T Nexus
2749 */
2750 if (pr_reg_p == pr_reg)
2751 continue;
2752
2753 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2754 pr_reg_p->pr_res_mapped_lun,
2755 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2756 }
2757 spin_unlock(&pr_tmpl->registration_lock);
2758
2759 write_aptpl:
2760 if (pr_tmpl->pr_aptpl_active) {
2761 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
2762 &pr_reg->pr_aptpl_buf[0],
2763 pr_tmpl->pr_aptpl_buf_len);
2764 if (!(ret))
2765 printk("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2766 }
2767
2768 core_scsi3_put_pr_reg(pr_reg);
2769 return 0;
2770 }
2771
2772 static int core_scsi3_emulate_pro_clear(
2773 struct se_cmd *cmd,
2774 u64 res_key)
2775 {
2776 struct se_device *dev = cmd->se_dev;
2777 struct se_node_acl *pr_reg_nacl;
2778 struct se_session *se_sess = SE_SESS(cmd);
2779 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2780 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2781 u32 pr_res_mapped_lun = 0;
2782 int calling_it_nexus = 0;
2783 /*
2784 * Locate the existing *pr_reg via struct se_node_acl pointers
2785 */
2786 pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd),
2787 se_sess->se_node_acl, se_sess);
2788 if (!(pr_reg_n)) {
2789 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2790 " PR_REGISTERED *pr_reg for CLEAR\n");
2791 return PYX_TRANSPORT_LU_COMM_FAILURE;
2792 }
2793 /*
2794 * From spc4r17 section 5.7.11.6, Clearing:
2795 *
2796 * Any application client may release the persistent reservation and
2797 * remove all registrations from a device server by issuing a
2798 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2799 * registered I_T nexus with the following parameter:
2800 *
2801 * a) RESERVATION KEY field set to the value of the reservation key
2802 * that is registered with the logical unit for the I_T nexus.
2803 */
2804 if (res_key != pr_reg_n->pr_res_key) {
2805 printk(KERN_ERR "SPC-3 PR REGISTER: Received"
2806 " res_key: 0x%016Lx does not match"
2807 " existing SA REGISTER res_key:"
2808 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2809 core_scsi3_put_pr_reg(pr_reg_n);
2810 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2811 }
2812 /*
2813 * a) Release the persistent reservation, if any;
2814 */
2815 spin_lock(&dev->dev_reservation_lock);
2816 pr_res_holder = dev->dev_pr_res_holder;
2817 if (pr_res_holder) {
2818 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2819 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2820 pr_res_holder, 0);
2821 }
2822 spin_unlock(&dev->dev_reservation_lock);
2823 /*
2824 * b) Remove all registration(s) (see spc4r17 5.7.7);
2825 */
2826 spin_lock(&pr_tmpl->registration_lock);
2827 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2828 &pr_tmpl->registration_list, pr_reg_list) {
2829
2830 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2831 pr_reg_nacl = pr_reg->pr_reg_nacl;
2832 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2833 __core_scsi3_free_registration(dev, pr_reg, NULL,
2834 calling_it_nexus);
2835 /*
2836 * e) Establish a unit attention condition for the initiator
2837 * port associated with every registered I_T nexus other
2838 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2839 * command with CLEAR service action was received, with the
2840 * additional sense code set to RESERVATIONS PREEMPTED.
2841 */
2842 if (!(calling_it_nexus))
2843 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2844 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2845 }
2846 spin_unlock(&pr_tmpl->registration_lock);
2847
2848 printk(KERN_INFO "SPC-3 PR [%s] Service Action: CLEAR complete\n",
2849 CMD_TFO(cmd)->get_fabric_name());
2850
2851 if (pr_tmpl->pr_aptpl_active) {
2852 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
2853 printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
2854 " for CLEAR\n");
2855 }
2856
2857 core_scsi3_pr_generation(dev);
2858 return 0;
2859 }
2860
2861 /*
2862 * Called with struct se_device->dev_reservation_lock held.
2863 */
2864 static void __core_scsi3_complete_pro_preempt(
2865 struct se_device *dev,
2866 struct t10_pr_registration *pr_reg,
2867 struct list_head *preempt_and_abort_list,
2868 int type,
2869 int scope,
2870 int abort)
2871 {
2872 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2873 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2874 char i_buf[PR_REG_ISID_ID_LEN];
2875 int prf_isid;
2876
2877 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2878 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2879 PR_REG_ISID_ID_LEN);
2880 /*
2881 * Do an implict RELEASE of the existing reservation.
2882 */
2883 if (dev->dev_pr_res_holder)
2884 __core_scsi3_complete_pro_release(dev, nacl,
2885 dev->dev_pr_res_holder, 0);
2886
2887 dev->dev_pr_res_holder = pr_reg;
2888 pr_reg->pr_res_holder = 1;
2889 pr_reg->pr_res_type = type;
2890 pr_reg->pr_res_scope = scope;
2891
2892 printk(KERN_INFO "SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2893 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2894 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2895 core_scsi3_pr_dump_type(type),
2896 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2897 printk(KERN_INFO "SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2898 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2899 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2900 /*
2901 * For PREEMPT_AND_ABORT, add the preempting reservation's
2902 * struct t10_pr_registration to the list that will be compared
2903 * against received CDBs..
2904 */
2905 if (preempt_and_abort_list)
2906 list_add_tail(&pr_reg->pr_reg_abort_list,
2907 preempt_and_abort_list);
2908 }
2909
2910 static void core_scsi3_release_preempt_and_abort(
2911 struct list_head *preempt_and_abort_list,
2912 struct t10_pr_registration *pr_reg_holder)
2913 {
2914 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2915
2916 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2917 pr_reg_abort_list) {
2918
2919 list_del(&pr_reg->pr_reg_abort_list);
2920 if (pr_reg_holder == pr_reg)
2921 continue;
2922 if (pr_reg->pr_res_holder) {
2923 printk(KERN_WARNING "pr_reg->pr_res_holder still set\n");
2924 continue;
2925 }
2926
2927 pr_reg->pr_reg_deve = NULL;
2928 pr_reg->pr_reg_nacl = NULL;
2929 kfree(pr_reg->pr_aptpl_buf);
2930 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2931 }
2932 }
2933
2934 int core_scsi3_check_cdb_abort_and_preempt(
2935 struct list_head *preempt_and_abort_list,
2936 struct se_cmd *cmd)
2937 {
2938 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2939
2940 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2941 pr_reg_abort_list) {
2942 if (pr_reg->pr_res_key == cmd->pr_res_key)
2943 return 0;
2944 }
2945
2946 return 1;
2947 }
2948
2949 static int core_scsi3_pro_preempt(
2950 struct se_cmd *cmd,
2951 int type,
2952 int scope,
2953 u64 res_key,
2954 u64 sa_res_key,
2955 int abort)
2956 {
2957 struct se_device *dev = SE_DEV(cmd);
2958 struct se_dev_entry *se_deve;
2959 struct se_node_acl *pr_reg_nacl;
2960 struct se_session *se_sess = SE_SESS(cmd);
2961 struct list_head preempt_and_abort_list;
2962 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2963 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
2964 u32 pr_res_mapped_lun = 0;
2965 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2966 int prh_type = 0, prh_scope = 0, ret;
2967
2968 if (!(se_sess))
2969 return PYX_TRANSPORT_LU_COMM_FAILURE;
2970
2971 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2972 pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
2973 se_sess);
2974 if (!(pr_reg_n)) {
2975 printk(KERN_ERR "SPC-3 PR: Unable to locate"
2976 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2977 (abort) ? "_AND_ABORT" : "");
2978 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2979 }
2980 if (pr_reg_n->pr_res_key != res_key) {
2981 core_scsi3_put_pr_reg(pr_reg_n);
2982 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2983 }
2984 if (scope != PR_SCOPE_LU_SCOPE) {
2985 printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2986 core_scsi3_put_pr_reg(pr_reg_n);
2987 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2988 }
2989 INIT_LIST_HEAD(&preempt_and_abort_list);
2990
2991 spin_lock(&dev->dev_reservation_lock);
2992 pr_res_holder = dev->dev_pr_res_holder;
2993 if (pr_res_holder &&
2994 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2995 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2996 all_reg = 1;
2997
2998 if (!(all_reg) && !(sa_res_key)) {
2999 spin_unlock(&dev->dev_reservation_lock);
3000 core_scsi3_put_pr_reg(pr_reg_n);
3001 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3002 }
3003 /*
3004 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3005 *
3006 * If the SERVICE ACTION RESERVATION KEY field does not identify a
3007 * persistent reservation holder or there is no persistent reservation
3008 * holder (i.e., there is no persistent reservation), then the device
3009 * server shall perform a preempt by doing the following in an
3010 * uninterrupted series of actions. (See below..)
3011 */
3012 if (!(pr_res_holder) || (pr_res_holder->pr_res_key != sa_res_key)) {
3013 /*
3014 * No existing or SA Reservation Key matching reservations..
3015 *
3016 * PROUT SA PREEMPT with All Registrant type reservations are
3017 * allowed to be processed without a matching SA Reservation Key
3018 */
3019 spin_lock(&pr_tmpl->registration_lock);
3020 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3021 &pr_tmpl->registration_list, pr_reg_list) {
3022 /*
3023 * Removing of registrations in non all registrants
3024 * type reservations without a matching SA reservation
3025 * key.
3026 *
3027 * a) Remove the registrations for all I_T nexuses
3028 * specified by the SERVICE ACTION RESERVATION KEY
3029 * field;
3030 * b) Ignore the contents of the SCOPE and TYPE fields;
3031 * c) Process tasks as defined in 5.7.1; and
3032 * d) Establish a unit attention condition for the
3033 * initiator port associated with every I_T nexus
3034 * that lost its registration other than the I_T
3035 * nexus on which the PERSISTENT RESERVE OUT command
3036 * was received, with the additional sense code set
3037 * to REGISTRATIONS PREEMPTED.
3038 */
3039 if (!(all_reg)) {
3040 if (pr_reg->pr_res_key != sa_res_key)
3041 continue;
3042
3043 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3044 pr_reg_nacl = pr_reg->pr_reg_nacl;
3045 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3046 __core_scsi3_free_registration(dev, pr_reg,
3047 (abort) ? &preempt_and_abort_list :
3048 NULL, calling_it_nexus);
3049 released_regs++;
3050 } else {
3051 /*
3052 * Case for any existing all registrants type
3053 * reservation, follow logic in spc4r17 section
3054 * 5.7.11.4 Preempting, Table 52 and Figure 7.
3055 *
3056 * For a ZERO SA Reservation key, release
3057 * all other registrations and do an implict
3058 * release of active persistent reservation.
3059 *
3060 * For a non-ZERO SA Reservation key, only
3061 * release the matching reservation key from
3062 * registrations.
3063 */
3064 if ((sa_res_key) &&
3065 (pr_reg->pr_res_key != sa_res_key))
3066 continue;
3067
3068 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3069 if (calling_it_nexus)
3070 continue;
3071
3072 pr_reg_nacl = pr_reg->pr_reg_nacl;
3073 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3074 __core_scsi3_free_registration(dev, pr_reg,
3075 (abort) ? &preempt_and_abort_list :
3076 NULL, 0);
3077 released_regs++;
3078 }
3079 if (!(calling_it_nexus))
3080 core_scsi3_ua_allocate(pr_reg_nacl,
3081 pr_res_mapped_lun, 0x2A,
3082 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3083 }
3084 spin_unlock(&pr_tmpl->registration_lock);
3085 /*
3086 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3087 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3088 * RESERVATION KEY field to a value that does not match any
3089 * registered reservation key, then the device server shall
3090 * complete the command with RESERVATION CONFLICT status.
3091 */
3092 if (!(released_regs)) {
3093 spin_unlock(&dev->dev_reservation_lock);
3094 core_scsi3_put_pr_reg(pr_reg_n);
3095 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3096 }
3097 /*
3098 * For an existing all registrants type reservation
3099 * with a zero SA rservation key, preempt the existing
3100 * reservation with the new PR type and scope.
3101 */
3102 if (pr_res_holder && all_reg && !(sa_res_key)) {
3103 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3104 (abort) ? &preempt_and_abort_list : NULL,
3105 type, scope, abort);
3106
3107 if (abort)
3108 core_scsi3_release_preempt_and_abort(
3109 &preempt_and_abort_list, pr_reg_n);
3110 }
3111 spin_unlock(&dev->dev_reservation_lock);
3112
3113 if (pr_tmpl->pr_aptpl_active) {
3114 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3115 &pr_reg_n->pr_aptpl_buf[0],
3116 pr_tmpl->pr_aptpl_buf_len);
3117 if (!(ret))
3118 printk(KERN_INFO "SPC-3 PR: Updated APTPL"
3119 " metadata for PREEMPT%s\n", (abort) ?
3120 "_AND_ABORT" : "");
3121 }
3122
3123 core_scsi3_put_pr_reg(pr_reg_n);
3124 core_scsi3_pr_generation(SE_DEV(cmd));
3125 return 0;
3126 }
3127 /*
3128 * The PREEMPTing SA reservation key matches that of the
3129 * existing persistent reservation, first, we check if
3130 * we are preempting our own reservation.
3131 * From spc4r17, section 5.7.11.4.3 Preempting
3132 * persistent reservations and registration handling
3133 *
3134 * If an all registrants persistent reservation is not
3135 * present, it is not an error for the persistent
3136 * reservation holder to preempt itself (i.e., a
3137 * PERSISTENT RESERVE OUT with a PREEMPT service action
3138 * or a PREEMPT AND ABORT service action with the
3139 * SERVICE ACTION RESERVATION KEY value equal to the
3140 * persistent reservation holder's reservation key that
3141 * is received from the persistent reservation holder).
3142 * In that case, the device server shall establish the
3143 * new persistent reservation and maintain the
3144 * registration.
3145 */
3146 prh_type = pr_res_holder->pr_res_type;
3147 prh_scope = pr_res_holder->pr_res_scope;
3148 /*
3149 * If the SERVICE ACTION RESERVATION KEY field identifies a
3150 * persistent reservation holder (see 5.7.10), the device
3151 * server shall perform a preempt by doing the following as
3152 * an uninterrupted series of actions:
3153 *
3154 * a) Release the persistent reservation for the holder
3155 * identified by the SERVICE ACTION RESERVATION KEY field;
3156 */
3157 if (pr_reg_n != pr_res_holder)
3158 __core_scsi3_complete_pro_release(dev,
3159 pr_res_holder->pr_reg_nacl,
3160 dev->dev_pr_res_holder, 0);
3161 /*
3162 * b) Remove the registrations for all I_T nexuses identified
3163 * by the SERVICE ACTION RESERVATION KEY field, except the
3164 * I_T nexus that is being used for the PERSISTENT RESERVE
3165 * OUT command. If an all registrants persistent reservation
3166 * is present and the SERVICE ACTION RESERVATION KEY field
3167 * is set to zero, then all registrations shall be removed
3168 * except for that of the I_T nexus that is being used for
3169 * the PERSISTENT RESERVE OUT command;
3170 */
3171 spin_lock(&pr_tmpl->registration_lock);
3172 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3173 &pr_tmpl->registration_list, pr_reg_list) {
3174
3175 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3176 if (calling_it_nexus)
3177 continue;
3178
3179 if (pr_reg->pr_res_key != sa_res_key)
3180 continue;
3181
3182 pr_reg_nacl = pr_reg->pr_reg_nacl;
3183 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3184 __core_scsi3_free_registration(dev, pr_reg,
3185 (abort) ? &preempt_and_abort_list : NULL,
3186 calling_it_nexus);
3187 /*
3188 * e) Establish a unit attention condition for the initiator
3189 * port associated with every I_T nexus that lost its
3190 * persistent reservation and/or registration, with the
3191 * additional sense code set to REGISTRATIONS PREEMPTED;
3192 */
3193 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3194 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3195 }
3196 spin_unlock(&pr_tmpl->registration_lock);
3197 /*
3198 * c) Establish a persistent reservation for the preempting
3199 * I_T nexus using the contents of the SCOPE and TYPE fields;
3200 */
3201 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3202 (abort) ? &preempt_and_abort_list : NULL,
3203 type, scope, abort);
3204 /*
3205 * d) Process tasks as defined in 5.7.1;
3206 * e) See above..
3207 * f) If the type or scope has changed, then for every I_T nexus
3208 * whose reservation key was not removed, except for the I_T
3209 * nexus on which the PERSISTENT RESERVE OUT command was
3210 * received, the device server shall establish a unit
3211 * attention condition for the initiator port associated with
3212 * that I_T nexus, with the additional sense code set to
3213 * RESERVATIONS RELEASED. If the type or scope have not
3214 * changed, then no unit attention condition(s) shall be
3215 * established for this reason.
3216 */
3217 if ((prh_type != type) || (prh_scope != scope)) {
3218 spin_lock(&pr_tmpl->registration_lock);
3219 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3220 &pr_tmpl->registration_list, pr_reg_list) {
3221
3222 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3223 if (calling_it_nexus)
3224 continue;
3225
3226 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3227 pr_reg->pr_res_mapped_lun, 0x2A,
3228 ASCQ_2AH_RESERVATIONS_RELEASED);
3229 }
3230 spin_unlock(&pr_tmpl->registration_lock);
3231 }
3232 spin_unlock(&dev->dev_reservation_lock);
3233 /*
3234 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3235 * All received CDBs for the matching existing reservation and
3236 * registrations undergo ABORT_TASK logic.
3237 *
3238 * From there, core_scsi3_release_preempt_and_abort() will
3239 * release every registration in the list (which have already
3240 * been removed from the primary pr_reg list), except the
3241 * new persistent reservation holder, the calling Initiator Port.
3242 */
3243 if (abort) {
3244 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3245 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3246 pr_reg_n);
3247 }
3248
3249 if (pr_tmpl->pr_aptpl_active) {
3250 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3251 &pr_reg_n->pr_aptpl_buf[0],
3252 pr_tmpl->pr_aptpl_buf_len);
3253 if (!(ret))
3254 printk("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3255 "%s\n", (abort) ? "_AND_ABORT" : "");
3256 }
3257
3258 core_scsi3_put_pr_reg(pr_reg_n);
3259 core_scsi3_pr_generation(SE_DEV(cmd));
3260 return 0;
3261 }
3262
3263 static int core_scsi3_emulate_pro_preempt(
3264 struct se_cmd *cmd,
3265 int type,
3266 int scope,
3267 u64 res_key,
3268 u64 sa_res_key,
3269 int abort)
3270 {
3271 int ret = 0;
3272
3273 switch (type) {
3274 case PR_TYPE_WRITE_EXCLUSIVE:
3275 case PR_TYPE_EXCLUSIVE_ACCESS:
3276 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3277 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3278 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3279 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3280 ret = core_scsi3_pro_preempt(cmd, type, scope,
3281 res_key, sa_res_key, abort);
3282 break;
3283 default:
3284 printk(KERN_ERR "SPC-3 PR: Unknown Service Action PREEMPT%s"
3285 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3286 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3287 }
3288
3289 return ret;
3290 }
3291
3292
3293 static int core_scsi3_emulate_pro_register_and_move(
3294 struct se_cmd *cmd,
3295 u64 res_key,
3296 u64 sa_res_key,
3297 int aptpl,
3298 int unreg)
3299 {
3300 struct se_session *se_sess = SE_SESS(cmd);
3301 struct se_device *dev = SE_DEV(cmd);
3302 struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3303 struct se_lun *se_lun = SE_LUN(cmd);
3304 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3305 struct se_port *se_port;
3306 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3307 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3308 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3309 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
3310 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3311 unsigned char *initiator_str;
3312 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3313 u32 tid_len, tmp_tid_len;
3314 int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3315 unsigned short rtpi;
3316 unsigned char proto_ident;
3317
3318 if (!(se_sess) || !(se_lun)) {
3319 printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3320 return PYX_TRANSPORT_LU_COMM_FAILURE;
3321 }
3322 memset(dest_iport, 0, 64);
3323 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3324 se_tpg = se_sess->se_tpg;
3325 tf_ops = TPG_TFO(se_tpg);
3326 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3327 /*
3328 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3329 * Register behaviors for a REGISTER AND MOVE service action
3330 *
3331 * Locate the existing *pr_reg via struct se_node_acl pointers
3332 */
3333 pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
3334 se_sess);
3335 if (!(pr_reg)) {
3336 printk(KERN_ERR "SPC-3 PR: Unable to locate PR_REGISTERED"
3337 " *pr_reg for REGISTER_AND_MOVE\n");
3338 return PYX_TRANSPORT_LU_COMM_FAILURE;
3339 }
3340 /*
3341 * The provided reservation key much match the existing reservation key
3342 * provided during this initiator's I_T nexus registration.
3343 */
3344 if (res_key != pr_reg->pr_res_key) {
3345 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received"
3346 " res_key: 0x%016Lx does not match existing SA REGISTER"
3347 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3348 core_scsi3_put_pr_reg(pr_reg);
3349 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3350 }
3351 /*
3352 * The service active reservation key needs to be non zero
3353 */
3354 if (!(sa_res_key)) {
3355 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received zero"
3356 " sa_res_key\n");
3357 core_scsi3_put_pr_reg(pr_reg);
3358 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3359 }
3360 /*
3361 * Determine the Relative Target Port Identifier where the reservation
3362 * will be moved to for the TransportID containing SCSI initiator WWN
3363 * information.
3364 */
3365 rtpi = (buf[18] & 0xff) << 8;
3366 rtpi |= buf[19] & 0xff;
3367 tid_len = (buf[20] & 0xff) << 24;
3368 tid_len |= (buf[21] & 0xff) << 16;
3369 tid_len |= (buf[22] & 0xff) << 8;
3370 tid_len |= buf[23] & 0xff;
3371
3372 if ((tid_len + 24) != cmd->data_length) {
3373 printk(KERN_ERR "SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3374 " does not equal CDB data_length: %u\n", tid_len,
3375 cmd->data_length);
3376 core_scsi3_put_pr_reg(pr_reg);
3377 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3378 }
3379
3380 spin_lock(&dev->se_port_lock);
3381 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3382 if (se_port->sep_rtpi != rtpi)
3383 continue;
3384 dest_se_tpg = se_port->sep_tpg;
3385 if (!(dest_se_tpg))
3386 continue;
3387 dest_tf_ops = TPG_TFO(dest_se_tpg);
3388 if (!(dest_tf_ops))
3389 continue;
3390
3391 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3392 smp_mb__after_atomic_inc();
3393 spin_unlock(&dev->se_port_lock);
3394
3395 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3396 if (ret != 0) {
3397 printk(KERN_ERR "core_scsi3_tpg_depend_item() failed"
3398 " for dest_se_tpg\n");
3399 atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3400 smp_mb__after_atomic_dec();
3401 core_scsi3_put_pr_reg(pr_reg);
3402 return PYX_TRANSPORT_LU_COMM_FAILURE;
3403 }
3404
3405 spin_lock(&dev->se_port_lock);
3406 break;
3407 }
3408 spin_unlock(&dev->se_port_lock);
3409
3410 if (!(dest_se_tpg) || (!dest_tf_ops)) {
3411 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3412 " fabric ops from Relative Target Port Identifier:"
3413 " %hu\n", rtpi);
3414 core_scsi3_put_pr_reg(pr_reg);
3415 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3416 }
3417 proto_ident = (buf[24] & 0x0f);
3418 #if 0
3419 printk("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3420 " 0x%02x\n", proto_ident);
3421 #endif
3422 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3423 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Received"
3424 " proto_ident: 0x%02x does not match ident: 0x%02x"
3425 " from fabric: %s\n", proto_ident,
3426 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3427 dest_tf_ops->get_fabric_name());
3428 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3429 goto out;
3430 }
3431 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3432 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3433 " containg a valid tpg_parse_pr_out_transport_id"
3434 " function pointer\n");
3435 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3436 goto out;
3437 }
3438 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3439 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3440 if (!(initiator_str)) {
3441 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3442 " initiator_str from Transport ID\n");
3443 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3444 goto out;
3445 }
3446
3447 printk(KERN_INFO "SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3448 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3449 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3450 iport_ptr : "");
3451 /*
3452 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3453 * action specifies a TransportID that is the same as the initiator port
3454 * of the I_T nexus for the command received, then the command shall
3455 * be terminated with CHECK CONDITION status, with the sense key set to
3456 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3457 * IN PARAMETER LIST.
3458 */
3459 pr_reg_nacl = pr_reg->pr_reg_nacl;
3460 matching_iname = (!strcmp(initiator_str,
3461 pr_reg_nacl->initiatorname)) ? 1 : 0;
3462 if (!(matching_iname))
3463 goto after_iport_check;
3464
3465 if (!(iport_ptr) || !(pr_reg->isid_present_at_reg)) {
3466 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3467 " matches: %s on received I_T Nexus\n", initiator_str,
3468 pr_reg_nacl->initiatorname);
3469 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3470 goto out;
3471 }
3472 if (!(strcmp(iport_ptr, pr_reg->pr_reg_isid))) {
3473 printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3474 " matches: %s %s on received I_T Nexus\n",
3475 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3476 pr_reg->pr_reg_isid);
3477 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3478 goto out;
3479 }
3480 after_iport_check:
3481 /*
3482 * Locate the destination struct se_node_acl from the received Transport ID
3483 */
3484 spin_lock_bh(&dest_se_tpg->acl_node_lock);
3485 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3486 initiator_str);
3487 if (dest_node_acl) {
3488 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3489 smp_mb__after_atomic_inc();
3490 }
3491 spin_unlock_bh(&dest_se_tpg->acl_node_lock);
3492
3493 if (!(dest_node_acl)) {
3494 printk(KERN_ERR "Unable to locate %s dest_node_acl for"
3495 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3496 initiator_str);
3497 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3498 goto out;
3499 }
3500 ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3501 if (ret != 0) {
3502 printk(KERN_ERR "core_scsi3_nodeacl_depend_item() for"
3503 " dest_node_acl\n");
3504 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3505 smp_mb__after_atomic_dec();
3506 dest_node_acl = NULL;
3507 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3508 goto out;
3509 }
3510 #if 0
3511 printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3512 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3513 dest_node_acl->initiatorname);
3514 #endif
3515 /*
3516 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3517 * PORT IDENTIFIER.
3518 */
3519 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3520 if (!(dest_se_deve)) {
3521 printk(KERN_ERR "Unable to locate %s dest_se_deve from RTPI:"
3522 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3523 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3524 goto out;
3525 }
3526
3527 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3528 if (ret < 0) {
3529 printk(KERN_ERR "core_scsi3_lunacl_depend_item() failed\n");
3530 atomic_dec(&dest_se_deve->pr_ref_count);
3531 smp_mb__after_atomic_dec();
3532 dest_se_deve = NULL;
3533 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3534 goto out;
3535 }
3536 #if 0
3537 printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3538 " ACL for dest_se_deve->mapped_lun: %u\n",
3539 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3540 dest_se_deve->mapped_lun);
3541 #endif
3542 /*
3543 * A persistent reservation needs to already existing in order to
3544 * successfully complete the REGISTER_AND_MOVE service action..
3545 */
3546 spin_lock(&dev->dev_reservation_lock);
3547 pr_res_holder = dev->dev_pr_res_holder;
3548 if (!(pr_res_holder)) {
3549 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: No reservation"
3550 " currently held\n");
3551 spin_unlock(&dev->dev_reservation_lock);
3552 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3553 goto out;
3554 }
3555 /*
3556 * The received on I_T Nexus must be the reservation holder.
3557 *
3558 * From spc4r17 section 5.7.8 Table 50 --
3559 * Register behaviors for a REGISTER AND MOVE service action
3560 */
3561 if (pr_res_holder != pr_reg) {
3562 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3563 " Nexus is not reservation holder\n");
3564 spin_unlock(&dev->dev_reservation_lock);
3565 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3566 goto out;
3567 }
3568 /*
3569 * From spc4r17 section 5.7.8: registering and moving reservation
3570 *
3571 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3572 * action is received and the established persistent reservation is a
3573 * Write Exclusive - All Registrants type or Exclusive Access -
3574 * All Registrants type reservation, then the command shall be completed
3575 * with RESERVATION CONFLICT status.
3576 */
3577 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3578 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3579 printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3580 " reservation for type: %s\n",
3581 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3582 spin_unlock(&dev->dev_reservation_lock);
3583 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3584 goto out;
3585 }
3586 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3587 /*
3588 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3589 */
3590 type = pr_res_holder->pr_res_type;
3591 scope = pr_res_holder->pr_res_type;
3592 /*
3593 * c) Associate the reservation key specified in the SERVICE ACTION
3594 * RESERVATION KEY field with the I_T nexus specified as the
3595 * destination of the register and move, where:
3596 * A) The I_T nexus is specified by the TransportID and the
3597 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3598 * B) Regardless of the TransportID format used, the association for
3599 * the initiator port is based on either the initiator port name
3600 * (see 3.1.71) on SCSI transport protocols where port names are
3601 * required or the initiator port identifier (see 3.1.70) on SCSI
3602 * transport protocols where port names are not required;
3603 * d) Register the reservation key specified in the SERVICE ACTION
3604 * RESERVATION KEY field;
3605 * e) Retain the reservation key specified in the SERVICE ACTION
3606 * RESERVATION KEY field and associated information;
3607 *
3608 * Also, It is not an error for a REGISTER AND MOVE service action to
3609 * register an I_T nexus that is already registered with the same
3610 * reservation key or a different reservation key.
3611 */
3612 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3613 iport_ptr);
3614 if (!(dest_pr_reg)) {
3615 ret = core_scsi3_alloc_registration(SE_DEV(cmd),
3616 dest_node_acl, dest_se_deve, iport_ptr,
3617 sa_res_key, 0, aptpl, 2, 1);
3618 if (ret != 0) {
3619 spin_unlock(&dev->dev_reservation_lock);
3620 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3621 goto out;
3622 }
3623 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3624 iport_ptr);
3625 new_reg = 1;
3626 }
3627 /*
3628 * f) Release the persistent reservation for the persistent reservation
3629 * holder (i.e., the I_T nexus on which the
3630 */
3631 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3632 dev->dev_pr_res_holder, 0);
3633 /*
3634 * g) Move the persistent reservation to the specified I_T nexus using
3635 * the same scope and type as the persistent reservation released in
3636 * item f); and
3637 */
3638 dev->dev_pr_res_holder = dest_pr_reg;
3639 dest_pr_reg->pr_res_holder = 1;
3640 dest_pr_reg->pr_res_type = type;
3641 pr_reg->pr_res_scope = scope;
3642 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3643 PR_REG_ISID_ID_LEN);
3644 /*
3645 * Increment PRGeneration for existing registrations..
3646 */
3647 if (!(new_reg))
3648 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3649 spin_unlock(&dev->dev_reservation_lock);
3650
3651 printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3652 " created new reservation holder TYPE: %s on object RTPI:"
3653 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3654 core_scsi3_pr_dump_type(type), rtpi,
3655 dest_pr_reg->pr_res_generation);
3656 printk(KERN_INFO "SPC-3 PR Successfully moved reservation from"
3657 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3658 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3659 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3660 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3661 iport_ptr : "");
3662 /*
3663 * It is now safe to release configfs group dependencies for destination
3664 * of Transport ID Initiator Device/Port Identifier
3665 */
3666 core_scsi3_lunacl_undepend_item(dest_se_deve);
3667 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3668 core_scsi3_tpg_undepend_item(dest_se_tpg);
3669 /*
3670 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3671 * nexus on which PERSISTENT RESERVE OUT command was received.
3672 */
3673 if (unreg) {
3674 spin_lock(&pr_tmpl->registration_lock);
3675 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3676 spin_unlock(&pr_tmpl->registration_lock);
3677 } else
3678 core_scsi3_put_pr_reg(pr_reg);
3679
3680 /*
3681 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3682 * write out the updated metadata to struct file for this SCSI device.
3683 */
3684 if (!(aptpl)) {
3685 pr_tmpl->pr_aptpl_active = 0;
3686 core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
3687 printk("SPC-3 PR: Set APTPL Bit Deactivated for"
3688 " REGISTER_AND_MOVE\n");
3689 } else {
3690 pr_tmpl->pr_aptpl_active = 1;
3691 ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
3692 &dest_pr_reg->pr_aptpl_buf[0],
3693 pr_tmpl->pr_aptpl_buf_len);
3694 if (!(ret))
3695 printk("SPC-3 PR: Set APTPL Bit Activated for"
3696 " REGISTER_AND_MOVE\n");
3697 }
3698
3699 core_scsi3_put_pr_reg(dest_pr_reg);
3700 return 0;
3701 out:
3702 if (dest_se_deve)
3703 core_scsi3_lunacl_undepend_item(dest_se_deve);
3704 if (dest_node_acl)
3705 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3706 core_scsi3_tpg_undepend_item(dest_se_tpg);
3707 core_scsi3_put_pr_reg(pr_reg);
3708 return ret;
3709 }
3710
3711 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3712 {
3713 unsigned int __v1, __v2;
3714
3715 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3716 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3717
3718 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3719 }
3720
3721 /*
3722 * See spc4r17 section 6.14 Table 170
3723 */
3724 static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
3725 {
3726 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3727 u64 res_key, sa_res_key;
3728 int sa, scope, type, aptpl;
3729 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3730 /*
3731 * FIXME: A NULL struct se_session pointer means an this is not coming from
3732 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3733 */
3734 if (!(SE_SESS(cmd)))
3735 return PYX_TRANSPORT_LU_COMM_FAILURE;
3736
3737 if (cmd->data_length < 24) {
3738 printk(KERN_WARNING "SPC-PR: Received PR OUT parameter list"
3739 " length too small: %u\n", cmd->data_length);
3740 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3741 }
3742 /*
3743 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3744 */
3745 sa = (cdb[1] & 0x1f);
3746 scope = (cdb[2] & 0xf0);
3747 type = (cdb[2] & 0x0f);
3748 /*
3749 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3750 */
3751 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3752 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3753 /*
3754 * REGISTER_AND_MOVE uses a different SA parameter list containing
3755 * SCSI TransportIDs.
3756 */
3757 if (sa != PRO_REGISTER_AND_MOVE) {
3758 spec_i_pt = (buf[20] & 0x08);
3759 all_tg_pt = (buf[20] & 0x04);
3760 aptpl = (buf[20] & 0x01);
3761 } else {
3762 aptpl = (buf[17] & 0x01);
3763 unreg = (buf[17] & 0x02);
3764 }
3765 /*
3766 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3767 */
3768 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3769 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3770 /*
3771 * From spc4r17 section 6.14:
3772 *
3773 * If the SPEC_I_PT bit is set to zero, the service action is not
3774 * REGISTER AND MOVE, and the parameter list length is not 24, then
3775 * the command shall be terminated with CHECK CONDITION status, with
3776 * the sense key set to ILLEGAL REQUEST, and the additional sense
3777 * code set to PARAMETER LIST LENGTH ERROR.
3778 */
3779 if (!(spec_i_pt) && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3780 (cmd->data_length != 24)) {
3781 printk(KERN_WARNING "SPC-PR: Received PR OUT illegal parameter"
3782 " list length: %u\n", cmd->data_length);
3783 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3784 }
3785 /*
3786 * (core_scsi3_emulate_pro_* function parameters
3787 * are defined by spc4r17 Table 174:
3788 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3789 */
3790 switch (sa) {
3791 case PRO_REGISTER:
3792 return core_scsi3_emulate_pro_register(cmd,
3793 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3794 case PRO_RESERVE:
3795 return core_scsi3_emulate_pro_reserve(cmd,
3796 type, scope, res_key);
3797 case PRO_RELEASE:
3798 return core_scsi3_emulate_pro_release(cmd,
3799 type, scope, res_key);
3800 case PRO_CLEAR:
3801 return core_scsi3_emulate_pro_clear(cmd, res_key);
3802 case PRO_PREEMPT:
3803 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3804 res_key, sa_res_key, 0);
3805 case PRO_PREEMPT_AND_ABORT:
3806 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3807 res_key, sa_res_key, 1);
3808 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3809 return core_scsi3_emulate_pro_register(cmd,
3810 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3811 case PRO_REGISTER_AND_MOVE:
3812 return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3813 sa_res_key, aptpl, unreg);
3814 default:
3815 printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service"
3816 " action: 0x%02x\n", cdb[1] & 0x1f);
3817 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3818 }
3819
3820 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3821 }
3822
3823 /*
3824 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3825 *
3826 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3827 */
3828 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3829 {
3830 struct se_device *se_dev = SE_DEV(cmd);
3831 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
3832 struct t10_pr_registration *pr_reg;
3833 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3834 u32 add_len = 0, off = 8;
3835
3836 if (cmd->data_length < 8) {
3837 printk(KERN_ERR "PRIN SA READ_KEYS SCSI Data Length: %u"
3838 " too small\n", cmd->data_length);
3839 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3840 }
3841
3842 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
3843 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
3844 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
3845 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
3846
3847 spin_lock(&T10_RES(su_dev)->registration_lock);
3848 list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
3849 pr_reg_list) {
3850 /*
3851 * Check for overflow of 8byte PRI READ_KEYS payload and
3852 * next reservation key list descriptor.
3853 */
3854 if ((add_len + 8) > (cmd->data_length - 8))
3855 break;
3856
3857 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3858 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3859 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3860 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3861 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3862 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3863 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3864 buf[off++] = (pr_reg->pr_res_key & 0xff);
3865
3866 add_len += 8;
3867 }
3868 spin_unlock(&T10_RES(su_dev)->registration_lock);
3869
3870 buf[4] = ((add_len >> 24) & 0xff);
3871 buf[5] = ((add_len >> 16) & 0xff);
3872 buf[6] = ((add_len >> 8) & 0xff);
3873 buf[7] = (add_len & 0xff);
3874
3875 return 0;
3876 }
3877
3878 /*
3879 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3880 *
3881 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3882 */
3883 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3884 {
3885 struct se_device *se_dev = SE_DEV(cmd);
3886 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
3887 struct t10_pr_registration *pr_reg;
3888 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3889 u64 pr_res_key;
3890 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3891
3892 if (cmd->data_length < 8) {
3893 printk(KERN_ERR "PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3894 " too small\n", cmd->data_length);
3895 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3896 }
3897
3898 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
3899 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
3900 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
3901 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
3902
3903 spin_lock(&se_dev->dev_reservation_lock);
3904 pr_reg = se_dev->dev_pr_res_holder;
3905 if ((pr_reg)) {
3906 /*
3907 * Set the hardcoded Additional Length
3908 */
3909 buf[4] = ((add_len >> 24) & 0xff);
3910 buf[5] = ((add_len >> 16) & 0xff);
3911 buf[6] = ((add_len >> 8) & 0xff);
3912 buf[7] = (add_len & 0xff);
3913
3914 if (cmd->data_length < 22) {
3915 spin_unlock(&se_dev->dev_reservation_lock);
3916 return 0;
3917 }
3918 /*
3919 * Set the Reservation key.
3920 *
3921 * From spc4r17, section 5.7.10:
3922 * A persistent reservation holder has its reservation key
3923 * returned in the parameter data from a PERSISTENT
3924 * RESERVE IN command with READ RESERVATION service action as
3925 * follows:
3926 * a) For a persistent reservation of the type Write Exclusive
3927 * - All Registrants or Exclusive Access ­ All Regitrants,
3928 * the reservation key shall be set to zero; or
3929 * b) For all other persistent reservation types, the
3930 * reservation key shall be set to the registered
3931 * reservation key for the I_T nexus that holds the
3932 * persistent reservation.
3933 */
3934 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3935 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3936 pr_res_key = 0;
3937 else
3938 pr_res_key = pr_reg->pr_res_key;
3939
3940 buf[8] = ((pr_res_key >> 56) & 0xff);
3941 buf[9] = ((pr_res_key >> 48) & 0xff);
3942 buf[10] = ((pr_res_key >> 40) & 0xff);
3943 buf[11] = ((pr_res_key >> 32) & 0xff);
3944 buf[12] = ((pr_res_key >> 24) & 0xff);
3945 buf[13] = ((pr_res_key >> 16) & 0xff);
3946 buf[14] = ((pr_res_key >> 8) & 0xff);
3947 buf[15] = (pr_res_key & 0xff);
3948 /*
3949 * Set the SCOPE and TYPE
3950 */
3951 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3952 (pr_reg->pr_res_type & 0x0f);
3953 }
3954 spin_unlock(&se_dev->dev_reservation_lock);
3955
3956 return 0;
3957 }
3958
3959 /*
3960 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3961 *
3962 * See spc4r17 section 6.13.4 Table 165
3963 */
3964 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3965 {
3966 struct se_device *dev = SE_DEV(cmd);
3967 struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
3968 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
3969 u16 add_len = 8; /* Hardcoded to 8. */
3970
3971 if (cmd->data_length < 6) {
3972 printk(KERN_ERR "PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3973 " %u too small\n", cmd->data_length);
3974 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3975 }
3976
3977 buf[0] = ((add_len << 8) & 0xff);
3978 buf[1] = (add_len & 0xff);
3979 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3980 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3981 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3982 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3983 /*
3984 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3985 * set the TMV: Task Mask Valid bit.
3986 */
3987 buf[3] |= 0x80;
3988 /*
3989 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3990 */
3991 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3992 /*
3993 * PTPL_A: Persistence across Target Power Loss Active bit
3994 */
3995 if (pr_tmpl->pr_aptpl_active)
3996 buf[3] |= 0x01;
3997 /*
3998 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3999 */
4000 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4001 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4002 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4003 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4004 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4005 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4006
4007 return 0;
4008 }
4009
4010 /*
4011 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4012 *
4013 * See spc4r17 section 6.13.5 Table 168 and 169
4014 */
4015 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4016 {
4017 struct se_device *se_dev = SE_DEV(cmd);
4018 struct se_node_acl *se_nacl;
4019 struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
4020 struct se_portal_group *se_tpg;
4021 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4022 struct t10_reservation_template *pr_tmpl = &SU_DEV(se_dev)->t10_reservation;
4023 unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
4024 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4025 u32 off = 8; /* off into first Full Status descriptor */
4026 int format_code = 0;
4027
4028 if (cmd->data_length < 8) {
4029 printk(KERN_ERR "PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4030 " too small\n", cmd->data_length);
4031 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4032 }
4033
4034 buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
4035 buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
4036 buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
4037 buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
4038
4039 spin_lock(&pr_tmpl->registration_lock);
4040 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4041 &pr_tmpl->registration_list, pr_reg_list) {
4042
4043 se_nacl = pr_reg->pr_reg_nacl;
4044 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4045 add_desc_len = 0;
4046
4047 atomic_inc(&pr_reg->pr_res_holders);
4048 smp_mb__after_atomic_inc();
4049 spin_unlock(&pr_tmpl->registration_lock);
4050 /*
4051 * Determine expected length of $FABRIC_MOD specific
4052 * TransportID full status descriptor..
4053 */
4054 exp_desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id_len(
4055 se_tpg, se_nacl, pr_reg, &format_code);
4056
4057 if ((exp_desc_len + add_len) > cmd->data_length) {
4058 printk(KERN_WARNING "SPC-3 PRIN READ_FULL_STATUS ran"
4059 " out of buffer: %d\n", cmd->data_length);
4060 spin_lock(&pr_tmpl->registration_lock);
4061 atomic_dec(&pr_reg->pr_res_holders);
4062 smp_mb__after_atomic_dec();
4063 break;
4064 }
4065 /*
4066 * Set RESERVATION KEY
4067 */
4068 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4069 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4070 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4071 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4072 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4073 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4074 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4075 buf[off++] = (pr_reg->pr_res_key & 0xff);
4076 off += 4; /* Skip Over Reserved area */
4077
4078 /*
4079 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4080 */
4081 if (pr_reg->pr_reg_all_tg_pt)
4082 buf[off] = 0x02;
4083 /*
4084 * The struct se_lun pointer will be present for the
4085 * reservation holder for PR_HOLDER bit.
4086 *
4087 * Also, if this registration is the reservation
4088 * holder, fill in SCOPE and TYPE in the next byte.
4089 */
4090 if (pr_reg->pr_res_holder) {
4091 buf[off++] |= 0x01;
4092 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4093 (pr_reg->pr_res_type & 0x0f);
4094 } else
4095 off += 2;
4096
4097 off += 4; /* Skip over reserved area */
4098 /*
4099 * From spc4r17 6.3.15:
4100 *
4101 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4102 * IDENTIFIER field contains the relative port identifier (see
4103 * 3.1.120) of the target port that is part of the I_T nexus
4104 * described by this full status descriptor. If the ALL_TG_PT
4105 * bit is set to one, the contents of the RELATIVE TARGET PORT
4106 * IDENTIFIER field are not defined by this standard.
4107 */
4108 if (!(pr_reg->pr_reg_all_tg_pt)) {
4109 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4110
4111 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4112 buf[off++] = (port->sep_rtpi & 0xff);
4113 } else
4114 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4115
4116 /*
4117 * Now, have the $FABRIC_MOD fill in the protocol identifier
4118 */
4119 desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id(se_tpg,
4120 se_nacl, pr_reg, &format_code, &buf[off+4]);
4121
4122 spin_lock(&pr_tmpl->registration_lock);
4123 atomic_dec(&pr_reg->pr_res_holders);
4124 smp_mb__after_atomic_dec();
4125 /*
4126 * Set the ADDITIONAL DESCRIPTOR LENGTH
4127 */
4128 buf[off++] = ((desc_len >> 24) & 0xff);
4129 buf[off++] = ((desc_len >> 16) & 0xff);
4130 buf[off++] = ((desc_len >> 8) & 0xff);
4131 buf[off++] = (desc_len & 0xff);
4132 /*
4133 * Size of full desctipor header minus TransportID
4134 * containing $FABRIC_MOD specific) initiator device/port
4135 * WWN information.
4136 *
4137 * See spc4r17 Section 6.13.5 Table 169
4138 */
4139 add_desc_len = (24 + desc_len);
4140
4141 off += desc_len;
4142 add_len += add_desc_len;
4143 }
4144 spin_unlock(&pr_tmpl->registration_lock);
4145 /*
4146 * Set ADDITIONAL_LENGTH
4147 */
4148 buf[4] = ((add_len >> 24) & 0xff);
4149 buf[5] = ((add_len >> 16) & 0xff);
4150 buf[6] = ((add_len >> 8) & 0xff);
4151 buf[7] = (add_len & 0xff);
4152
4153 return 0;
4154 }
4155
4156 static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
4157 {
4158 switch (cdb[1] & 0x1f) {
4159 case PRI_READ_KEYS:
4160 return core_scsi3_pri_read_keys(cmd);
4161 case PRI_READ_RESERVATION:
4162 return core_scsi3_pri_read_reservation(cmd);
4163 case PRI_REPORT_CAPABILITIES:
4164 return core_scsi3_pri_report_capabilities(cmd);
4165 case PRI_READ_FULL_STATUS:
4166 return core_scsi3_pri_read_full_status(cmd);
4167 default:
4168 printk(KERN_ERR "Unknown PERSISTENT_RESERVE_IN service"
4169 " action: 0x%02x\n", cdb[1] & 0x1f);
4170 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4171 }
4172
4173 }
4174
4175 int core_scsi3_emulate_pr(struct se_cmd *cmd)
4176 {
4177 unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0];
4178 struct se_device *dev = cmd->se_dev;
4179 /*
4180 * Following spc2r20 5.5.1 Reservations overview:
4181 *
4182 * If a logical unit has been reserved by any RESERVE command and is
4183 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4184 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4185 * initiator or service action and shall terminate with a RESERVATION
4186 * CONFLICT status.
4187 */
4188 if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
4189 printk(KERN_ERR "Received PERSISTENT_RESERVE CDB while legacy"
4190 " SPC-2 reservation is held, returning"
4191 " RESERVATION_CONFLICT\n");
4192 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4193 }
4194
4195 return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
4196 core_scsi3_emulate_pr_out(cmd, cdb) :
4197 core_scsi3_emulate_pr_in(cmd, cdb);
4198 }
4199
4200 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4201 {
4202 return 0;
4203 }
4204
4205 static int core_pt_seq_non_holder(
4206 struct se_cmd *cmd,
4207 unsigned char *cdb,
4208 u32 pr_reg_type)
4209 {
4210 return 0;
4211 }
4212
4213 int core_setup_reservations(struct se_device *dev, int force_pt)
4214 {
4215 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4216 struct t10_reservation_template *rest = &su_dev->t10_reservation;
4217 /*
4218 * If this device is from Target_Core_Mod/pSCSI, use the reservations
4219 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
4220 * cause a problem because libata and some SATA RAID HBAs appear
4221 * under Linux/SCSI, but to emulate reservations themselves.
4222 */
4223 if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4224 !(DEV_ATTRIB(dev)->emulate_reservations)) || force_pt) {
4225 rest->res_type = SPC_PASSTHROUGH;
4226 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4227 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4228 printk(KERN_INFO "%s: Using SPC_PASSTHROUGH, no reservation"
4229 " emulation\n", TRANSPORT(dev)->name);
4230 return 0;
4231 }
4232 /*
4233 * If SPC-3 or above is reported by real or emulated struct se_device,
4234 * use emulated Persistent Reservations.
4235 */
4236 if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) {
4237 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4238 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4239 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4240 printk(KERN_INFO "%s: Using SPC3_PERSISTENT_RESERVATIONS"
4241 " emulation\n", TRANSPORT(dev)->name);
4242 } else {
4243 rest->res_type = SPC2_RESERVATIONS;
4244 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4245 rest->pr_ops.t10_seq_non_holder =
4246 &core_scsi2_reservation_seq_non_holder;
4247 printk(KERN_INFO "%s: Using SPC2_RESERVATIONS emulation\n",
4248 TRANSPORT(dev)->name);
4249 }
4250
4251 return 0;
4252 }
Linus' kernel tree