Root/
1 | /******************************************************************************* |
2 | * Filename: target_core_pr.c |
3 | * |
4 | * This file contains SPC-3 compliant persistent reservations and |
5 | * legacy SPC-2 reservations with compatible reservation handling (CRH=1) |
6 | * |
7 | * (c) Copyright 2009-2012 RisingTide Systems LLC. |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License as published by |
13 | * the Free Software Foundation; either version 2 of the License, or |
14 | * (at your option) any later version. |
15 | * |
16 | * This program is distributed in the hope that it will be useful, |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
19 | * GNU General Public License for more details. |
20 | * |
21 | * You should have received a copy of the GNU General Public License |
22 | * along with this program; if not, write to the Free Software |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
24 | * |
25 | ******************************************************************************/ |
26 | |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> |
29 | #include <linux/list.h> |
30 | #include <linux/file.h> |
31 | #include <scsi/scsi.h> |
32 | #include <scsi/scsi_cmnd.h> |
33 | #include <asm/unaligned.h> |
34 | |
35 | #include <target/target_core_base.h> |
36 | #include <target/target_core_backend.h> |
37 | #include <target/target_core_fabric.h> |
38 | #include <target/target_core_configfs.h> |
39 | |
40 | #include "target_core_internal.h" |
41 | #include "target_core_pr.h" |
42 | #include "target_core_ua.h" |
43 | |
44 | /* |
45 | * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) |
46 | */ |
47 | struct pr_transport_id_holder { |
48 | int dest_local_nexus; |
49 | struct t10_pr_registration *dest_pr_reg; |
50 | struct se_portal_group *dest_tpg; |
51 | struct se_node_acl *dest_node_acl; |
52 | struct se_dev_entry *dest_se_deve; |
53 | struct list_head dest_list; |
54 | }; |
55 | |
56 | int core_pr_dump_initiator_port( |
57 | struct t10_pr_registration *pr_reg, |
58 | char *buf, |
59 | u32 size) |
60 | { |
61 | if (!pr_reg->isid_present_at_reg) |
62 | return 0; |
63 | |
64 | snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); |
65 | return 1; |
66 | } |
67 | |
68 | static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, |
69 | struct t10_pr_registration *, int); |
70 | |
71 | static sense_reason_t |
72 | target_scsi2_reservation_check(struct se_cmd *cmd) |
73 | { |
74 | struct se_device *dev = cmd->se_dev; |
75 | struct se_session *sess = cmd->se_sess; |
76 | |
77 | switch (cmd->t_task_cdb[0]) { |
78 | case INQUIRY: |
79 | case RELEASE: |
80 | case RELEASE_10: |
81 | return 0; |
82 | default: |
83 | break; |
84 | } |
85 | |
86 | if (!dev->dev_reserved_node_acl || !sess) |
87 | return 0; |
88 | |
89 | if (dev->dev_reserved_node_acl != sess->se_node_acl) |
90 | return TCM_RESERVATION_CONFLICT; |
91 | |
92 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { |
93 | if (dev->dev_res_bin_isid != sess->sess_bin_isid) |
94 | return TCM_RESERVATION_CONFLICT; |
95 | } |
96 | |
97 | return 0; |
98 | } |
99 | |
100 | static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, |
101 | struct se_node_acl *, struct se_session *); |
102 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *); |
103 | |
104 | static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) |
105 | { |
106 | struct se_session *se_sess = cmd->se_sess; |
107 | struct se_device *dev = cmd->se_dev; |
108 | struct t10_pr_registration *pr_reg; |
109 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
110 | int conflict = 0; |
111 | |
112 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
113 | se_sess); |
114 | if (pr_reg) { |
115 | /* |
116 | * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE |
117 | * behavior |
118 | * |
119 | * A RESERVE(6) or RESERVE(10) command shall complete with GOOD |
120 | * status, but no reservation shall be established and the |
121 | * persistent reservation shall not be changed, if the command |
122 | * is received from a) and b) below. |
123 | * |
124 | * A RELEASE(6) or RELEASE(10) command shall complete with GOOD |
125 | * status, but the persistent reservation shall not be released, |
126 | * if the command is received from a) and b) |
127 | * |
128 | * a) An I_T nexus that is a persistent reservation holder; or |
129 | * b) An I_T nexus that is registered if a registrants only or |
130 | * all registrants type persistent reservation is present. |
131 | * |
132 | * In all other cases, a RESERVE(6) command, RESERVE(10) command, |
133 | * RELEASE(6) command, or RELEASE(10) command shall be processed |
134 | * as defined in SPC-2. |
135 | */ |
136 | if (pr_reg->pr_res_holder) { |
137 | core_scsi3_put_pr_reg(pr_reg); |
138 | return 1; |
139 | } |
140 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || |
141 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || |
142 | (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
143 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
144 | core_scsi3_put_pr_reg(pr_reg); |
145 | return 1; |
146 | } |
147 | core_scsi3_put_pr_reg(pr_reg); |
148 | conflict = 1; |
149 | } else { |
150 | /* |
151 | * Following spc2r20 5.5.1 Reservations overview: |
152 | * |
153 | * If a logical unit has executed a PERSISTENT RESERVE OUT |
154 | * command with the REGISTER or the REGISTER AND IGNORE |
155 | * EXISTING KEY service action and is still registered by any |
156 | * initiator, all RESERVE commands and all RELEASE commands |
157 | * regardless of initiator shall conflict and shall terminate |
158 | * with a RESERVATION CONFLICT status. |
159 | */ |
160 | spin_lock(&pr_tmpl->registration_lock); |
161 | conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; |
162 | spin_unlock(&pr_tmpl->registration_lock); |
163 | } |
164 | |
165 | if (conflict) { |
166 | pr_err("Received legacy SPC-2 RESERVE/RELEASE" |
167 | " while active SPC-3 registrations exist," |
168 | " returning RESERVATION_CONFLICT\n"); |
169 | return -EBUSY; |
170 | } |
171 | |
172 | return 0; |
173 | } |
174 | |
175 | sense_reason_t |
176 | target_scsi2_reservation_release(struct se_cmd *cmd) |
177 | { |
178 | struct se_device *dev = cmd->se_dev; |
179 | struct se_session *sess = cmd->se_sess; |
180 | struct se_portal_group *tpg; |
181 | int rc; |
182 | |
183 | if (!sess || !sess->se_tpg) |
184 | goto out; |
185 | rc = target_check_scsi2_reservation_conflict(cmd); |
186 | if (rc == 1) |
187 | goto out; |
188 | if (rc < 0) |
189 | return TCM_RESERVATION_CONFLICT; |
190 | |
191 | spin_lock(&dev->dev_reservation_lock); |
192 | if (!dev->dev_reserved_node_acl || !sess) |
193 | goto out_unlock; |
194 | |
195 | if (dev->dev_reserved_node_acl != sess->se_node_acl) |
196 | goto out_unlock; |
197 | |
198 | if (dev->dev_res_bin_isid != sess->sess_bin_isid) |
199 | goto out_unlock; |
200 | |
201 | dev->dev_reserved_node_acl = NULL; |
202 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
203 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { |
204 | dev->dev_res_bin_isid = 0; |
205 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; |
206 | } |
207 | tpg = sess->se_tpg; |
208 | pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" |
209 | " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
210 | cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, |
211 | sess->se_node_acl->initiatorname); |
212 | |
213 | out_unlock: |
214 | spin_unlock(&dev->dev_reservation_lock); |
215 | out: |
216 | target_complete_cmd(cmd, GOOD); |
217 | return 0; |
218 | } |
219 | |
220 | sense_reason_t |
221 | target_scsi2_reservation_reserve(struct se_cmd *cmd) |
222 | { |
223 | struct se_device *dev = cmd->se_dev; |
224 | struct se_session *sess = cmd->se_sess; |
225 | struct se_portal_group *tpg; |
226 | sense_reason_t ret = 0; |
227 | int rc; |
228 | |
229 | if ((cmd->t_task_cdb[1] & 0x01) && |
230 | (cmd->t_task_cdb[1] & 0x02)) { |
231 | pr_err("LongIO and Obselete Bits set, returning" |
232 | " ILLEGAL_REQUEST\n"); |
233 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
234 | } |
235 | /* |
236 | * This is currently the case for target_core_mod passthrough struct se_cmd |
237 | * ops |
238 | */ |
239 | if (!sess || !sess->se_tpg) |
240 | goto out; |
241 | rc = target_check_scsi2_reservation_conflict(cmd); |
242 | if (rc == 1) |
243 | goto out; |
244 | |
245 | if (rc < 0) |
246 | return TCM_RESERVATION_CONFLICT; |
247 | |
248 | tpg = sess->se_tpg; |
249 | spin_lock(&dev->dev_reservation_lock); |
250 | if (dev->dev_reserved_node_acl && |
251 | (dev->dev_reserved_node_acl != sess->se_node_acl)) { |
252 | pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", |
253 | tpg->se_tpg_tfo->get_fabric_name()); |
254 | pr_err("Original reserver LUN: %u %s\n", |
255 | cmd->se_lun->unpacked_lun, |
256 | dev->dev_reserved_node_acl->initiatorname); |
257 | pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" |
258 | " from %s \n", cmd->se_lun->unpacked_lun, |
259 | cmd->se_deve->mapped_lun, |
260 | sess->se_node_acl->initiatorname); |
261 | ret = TCM_RESERVATION_CONFLICT; |
262 | goto out_unlock; |
263 | } |
264 | |
265 | dev->dev_reserved_node_acl = sess->se_node_acl; |
266 | dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; |
267 | if (sess->sess_bin_isid != 0) { |
268 | dev->dev_res_bin_isid = sess->sess_bin_isid; |
269 | dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; |
270 | } |
271 | pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" |
272 | " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
273 | cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, |
274 | sess->se_node_acl->initiatorname); |
275 | |
276 | out_unlock: |
277 | spin_unlock(&dev->dev_reservation_lock); |
278 | out: |
279 | if (!ret) |
280 | target_complete_cmd(cmd, GOOD); |
281 | return ret; |
282 | } |
283 | |
284 | |
285 | /* |
286 | * Begin SPC-3/SPC-4 Persistent Reservations emulation support |
287 | * |
288 | * This function is called by those initiator ports who are *NOT* |
289 | * the active PR reservation holder when a reservation is present. |
290 | */ |
291 | static int core_scsi3_pr_seq_non_holder( |
292 | struct se_cmd *cmd, |
293 | u32 pr_reg_type) |
294 | { |
295 | unsigned char *cdb = cmd->t_task_cdb; |
296 | struct se_dev_entry *se_deve; |
297 | struct se_session *se_sess = cmd->se_sess; |
298 | int other_cdb = 0, ignore_reg; |
299 | int registered_nexus = 0, ret = 1; /* Conflict by default */ |
300 | int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ |
301 | int we = 0; /* Write Exclusive */ |
302 | int legacy = 0; /* Act like a legacy device and return |
303 | * RESERVATION CONFLICT on some CDBs */ |
304 | |
305 | se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
306 | /* |
307 | * Determine if the registration should be ignored due to |
308 | * non-matching ISIDs in target_scsi3_pr_reservation_check(). |
309 | */ |
310 | ignore_reg = (pr_reg_type & 0x80000000); |
311 | if (ignore_reg) |
312 | pr_reg_type &= ~0x80000000; |
313 | |
314 | switch (pr_reg_type) { |
315 | case PR_TYPE_WRITE_EXCLUSIVE: |
316 | we = 1; |
317 | case PR_TYPE_EXCLUSIVE_ACCESS: |
318 | /* |
319 | * Some commands are only allowed for the persistent reservation |
320 | * holder. |
321 | */ |
322 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
323 | registered_nexus = 1; |
324 | break; |
325 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
326 | we = 1; |
327 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
328 | /* |
329 | * Some commands are only allowed for registered I_T Nexuses. |
330 | */ |
331 | reg_only = 1; |
332 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
333 | registered_nexus = 1; |
334 | break; |
335 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
336 | we = 1; |
337 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
338 | /* |
339 | * Each registered I_T Nexus is a reservation holder. |
340 | */ |
341 | all_reg = 1; |
342 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
343 | registered_nexus = 1; |
344 | break; |
345 | default: |
346 | return -EINVAL; |
347 | } |
348 | /* |
349 | * Referenced from spc4r17 table 45 for *NON* PR holder access |
350 | */ |
351 | switch (cdb[0]) { |
352 | case SECURITY_PROTOCOL_IN: |
353 | if (registered_nexus) |
354 | return 0; |
355 | ret = (we) ? 0 : 1; |
356 | break; |
357 | case MODE_SENSE: |
358 | case MODE_SENSE_10: |
359 | case READ_ATTRIBUTE: |
360 | case READ_BUFFER: |
361 | case RECEIVE_DIAGNOSTIC: |
362 | if (legacy) { |
363 | ret = 1; |
364 | break; |
365 | } |
366 | if (registered_nexus) { |
367 | ret = 0; |
368 | break; |
369 | } |
370 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
371 | break; |
372 | case PERSISTENT_RESERVE_OUT: |
373 | /* |
374 | * This follows PERSISTENT_RESERVE_OUT service actions that |
375 | * are allowed in the presence of various reservations. |
376 | * See spc4r17, table 46 |
377 | */ |
378 | switch (cdb[1] & 0x1f) { |
379 | case PRO_CLEAR: |
380 | case PRO_PREEMPT: |
381 | case PRO_PREEMPT_AND_ABORT: |
382 | ret = (registered_nexus) ? 0 : 1; |
383 | break; |
384 | case PRO_REGISTER: |
385 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: |
386 | ret = 0; |
387 | break; |
388 | case PRO_REGISTER_AND_MOVE: |
389 | case PRO_RESERVE: |
390 | ret = 1; |
391 | break; |
392 | case PRO_RELEASE: |
393 | ret = (registered_nexus) ? 0 : 1; |
394 | break; |
395 | default: |
396 | pr_err("Unknown PERSISTENT_RESERVE_OUT service" |
397 | " action: 0x%02x\n", cdb[1] & 0x1f); |
398 | return -EINVAL; |
399 | } |
400 | break; |
401 | case RELEASE: |
402 | case RELEASE_10: |
403 | /* Handled by CRH=1 in target_scsi2_reservation_release() */ |
404 | ret = 0; |
405 | break; |
406 | case RESERVE: |
407 | case RESERVE_10: |
408 | /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ |
409 | ret = 0; |
410 | break; |
411 | case TEST_UNIT_READY: |
412 | ret = (legacy) ? 1 : 0; /* Conflict for legacy */ |
413 | break; |
414 | case MAINTENANCE_IN: |
415 | switch (cdb[1] & 0x1f) { |
416 | case MI_MANAGEMENT_PROTOCOL_IN: |
417 | if (registered_nexus) { |
418 | ret = 0; |
419 | break; |
420 | } |
421 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
422 | break; |
423 | case MI_REPORT_SUPPORTED_OPERATION_CODES: |
424 | case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: |
425 | if (legacy) { |
426 | ret = 1; |
427 | break; |
428 | } |
429 | if (registered_nexus) { |
430 | ret = 0; |
431 | break; |
432 | } |
433 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
434 | break; |
435 | case MI_REPORT_ALIASES: |
436 | case MI_REPORT_IDENTIFYING_INFORMATION: |
437 | case MI_REPORT_PRIORITY: |
438 | case MI_REPORT_TARGET_PGS: |
439 | case MI_REPORT_TIMESTAMP: |
440 | ret = 0; /* Allowed */ |
441 | break; |
442 | default: |
443 | pr_err("Unknown MI Service Action: 0x%02x\n", |
444 | (cdb[1] & 0x1f)); |
445 | return -EINVAL; |
446 | } |
447 | break; |
448 | case ACCESS_CONTROL_IN: |
449 | case ACCESS_CONTROL_OUT: |
450 | case INQUIRY: |
451 | case LOG_SENSE: |
452 | case READ_MEDIA_SERIAL_NUMBER: |
453 | case REPORT_LUNS: |
454 | case REQUEST_SENSE: |
455 | case PERSISTENT_RESERVE_IN: |
456 | ret = 0; /*/ Allowed CDBs */ |
457 | break; |
458 | default: |
459 | other_cdb = 1; |
460 | break; |
461 | } |
462 | /* |
463 | * Case where the CDB is explicitly allowed in the above switch |
464 | * statement. |
465 | */ |
466 | if (!ret && !other_cdb) { |
467 | pr_debug("Allowing explict CDB: 0x%02x for %s" |
468 | " reservation holder\n", cdb[0], |
469 | core_scsi3_pr_dump_type(pr_reg_type)); |
470 | |
471 | return ret; |
472 | } |
473 | /* |
474 | * Check if write exclusive initiator ports *NOT* holding the |
475 | * WRITE_EXCLUSIVE_* reservation. |
476 | */ |
477 | if (we && !registered_nexus) { |
478 | if (cmd->data_direction == DMA_TO_DEVICE) { |
479 | /* |
480 | * Conflict for write exclusive |
481 | */ |
482 | pr_debug("%s Conflict for unregistered nexus" |
483 | " %s CDB: 0x%02x to %s reservation\n", |
484 | transport_dump_cmd_direction(cmd), |
485 | se_sess->se_node_acl->initiatorname, cdb[0], |
486 | core_scsi3_pr_dump_type(pr_reg_type)); |
487 | return 1; |
488 | } else { |
489 | /* |
490 | * Allow non WRITE CDBs for all Write Exclusive |
491 | * PR TYPEs to pass for registered and |
492 | * non-registered_nexuxes NOT holding the reservation. |
493 | * |
494 | * We only make noise for the unregisterd nexuses, |
495 | * as we expect registered non-reservation holding |
496 | * nexuses to issue CDBs. |
497 | */ |
498 | |
499 | if (!registered_nexus) { |
500 | pr_debug("Allowing implict CDB: 0x%02x" |
501 | " for %s reservation on unregistered" |
502 | " nexus\n", cdb[0], |
503 | core_scsi3_pr_dump_type(pr_reg_type)); |
504 | } |
505 | |
506 | return 0; |
507 | } |
508 | } else if ((reg_only) || (all_reg)) { |
509 | if (registered_nexus) { |
510 | /* |
511 | * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, |
512 | * allow commands from registered nexuses. |
513 | */ |
514 | |
515 | pr_debug("Allowing implict CDB: 0x%02x for %s" |
516 | " reservation\n", cdb[0], |
517 | core_scsi3_pr_dump_type(pr_reg_type)); |
518 | |
519 | return 0; |
520 | } |
521 | } |
522 | pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" |
523 | " for %s reservation\n", transport_dump_cmd_direction(cmd), |
524 | (registered_nexus) ? "" : "un", |
525 | se_sess->se_node_acl->initiatorname, cdb[0], |
526 | core_scsi3_pr_dump_type(pr_reg_type)); |
527 | |
528 | return 1; /* Conflict by default */ |
529 | } |
530 | |
531 | static sense_reason_t |
532 | target_scsi3_pr_reservation_check(struct se_cmd *cmd) |
533 | { |
534 | struct se_device *dev = cmd->se_dev; |
535 | struct se_session *sess = cmd->se_sess; |
536 | u32 pr_reg_type; |
537 | |
538 | if (!dev->dev_pr_res_holder) |
539 | return 0; |
540 | |
541 | pr_reg_type = dev->dev_pr_res_holder->pr_res_type; |
542 | cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; |
543 | if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) |
544 | goto check_nonholder; |
545 | |
546 | if (dev->dev_pr_res_holder->isid_present_at_reg) { |
547 | if (dev->dev_pr_res_holder->pr_reg_bin_isid != |
548 | sess->sess_bin_isid) { |
549 | pr_reg_type |= 0x80000000; |
550 | goto check_nonholder; |
551 | } |
552 | } |
553 | |
554 | return 0; |
555 | |
556 | check_nonholder: |
557 | if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type)) |
558 | return TCM_RESERVATION_CONFLICT; |
559 | return 0; |
560 | } |
561 | |
562 | static u32 core_scsi3_pr_generation(struct se_device *dev) |
563 | { |
564 | u32 prg; |
565 | |
566 | /* |
567 | * PRGeneration field shall contain the value of a 32-bit wrapping |
568 | * counter mainted by the device server. |
569 | * |
570 | * Note that this is done regardless of Active Persist across |
571 | * Target PowerLoss (APTPL) |
572 | * |
573 | * See spc4r17 section 6.3.12 READ_KEYS service action |
574 | */ |
575 | spin_lock(&dev->dev_reservation_lock); |
576 | prg = dev->t10_pr.pr_generation++; |
577 | spin_unlock(&dev->dev_reservation_lock); |
578 | |
579 | return prg; |
580 | } |
581 | |
582 | static struct t10_pr_registration *__core_scsi3_do_alloc_registration( |
583 | struct se_device *dev, |
584 | struct se_node_acl *nacl, |
585 | struct se_dev_entry *deve, |
586 | unsigned char *isid, |
587 | u64 sa_res_key, |
588 | int all_tg_pt, |
589 | int aptpl) |
590 | { |
591 | struct t10_pr_registration *pr_reg; |
592 | |
593 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); |
594 | if (!pr_reg) { |
595 | pr_err("Unable to allocate struct t10_pr_registration\n"); |
596 | return NULL; |
597 | } |
598 | |
599 | pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len, |
600 | GFP_ATOMIC); |
601 | if (!pr_reg->pr_aptpl_buf) { |
602 | pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); |
603 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
604 | return NULL; |
605 | } |
606 | |
607 | INIT_LIST_HEAD(&pr_reg->pr_reg_list); |
608 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); |
609 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); |
610 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); |
611 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); |
612 | atomic_set(&pr_reg->pr_res_holders, 0); |
613 | pr_reg->pr_reg_nacl = nacl; |
614 | pr_reg->pr_reg_deve = deve; |
615 | pr_reg->pr_res_mapped_lun = deve->mapped_lun; |
616 | pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; |
617 | pr_reg->pr_res_key = sa_res_key; |
618 | pr_reg->pr_reg_all_tg_pt = all_tg_pt; |
619 | pr_reg->pr_reg_aptpl = aptpl; |
620 | pr_reg->pr_reg_tg_pt_lun = deve->se_lun; |
621 | /* |
622 | * If an ISID value for this SCSI Initiator Port exists, |
623 | * save it to the registration now. |
624 | */ |
625 | if (isid != NULL) { |
626 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); |
627 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); |
628 | pr_reg->isid_present_at_reg = 1; |
629 | } |
630 | |
631 | return pr_reg; |
632 | } |
633 | |
634 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); |
635 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); |
636 | |
637 | /* |
638 | * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 |
639 | * modes. |
640 | */ |
641 | static struct t10_pr_registration *__core_scsi3_alloc_registration( |
642 | struct se_device *dev, |
643 | struct se_node_acl *nacl, |
644 | struct se_dev_entry *deve, |
645 | unsigned char *isid, |
646 | u64 sa_res_key, |
647 | int all_tg_pt, |
648 | int aptpl) |
649 | { |
650 | struct se_dev_entry *deve_tmp; |
651 | struct se_node_acl *nacl_tmp; |
652 | struct se_port *port, *port_tmp; |
653 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
654 | struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; |
655 | int ret; |
656 | /* |
657 | * Create a registration for the I_T Nexus upon which the |
658 | * PROUT REGISTER was received. |
659 | */ |
660 | pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, |
661 | sa_res_key, all_tg_pt, aptpl); |
662 | if (!pr_reg) |
663 | return NULL; |
664 | /* |
665 | * Return pointer to pr_reg for ALL_TG_PT=0 |
666 | */ |
667 | if (!all_tg_pt) |
668 | return pr_reg; |
669 | /* |
670 | * Create list of matching SCSI Initiator Port registrations |
671 | * for ALL_TG_PT=1 |
672 | */ |
673 | spin_lock(&dev->se_port_lock); |
674 | list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { |
675 | atomic_inc(&port->sep_tg_pt_ref_cnt); |
676 | smp_mb__after_atomic_inc(); |
677 | spin_unlock(&dev->se_port_lock); |
678 | |
679 | spin_lock_bh(&port->sep_alua_lock); |
680 | list_for_each_entry(deve_tmp, &port->sep_alua_list, |
681 | alua_port_list) { |
682 | /* |
683 | * This pointer will be NULL for demo mode MappedLUNs |
684 | * that have not been make explict via a ConfigFS |
685 | * MappedLUN group for the SCSI Initiator Node ACL. |
686 | */ |
687 | if (!deve_tmp->se_lun_acl) |
688 | continue; |
689 | |
690 | nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; |
691 | /* |
692 | * Skip the matching struct se_node_acl that is allocated |
693 | * above.. |
694 | */ |
695 | if (nacl == nacl_tmp) |
696 | continue; |
697 | /* |
698 | * Only perform PR registrations for target ports on |
699 | * the same fabric module as the REGISTER w/ ALL_TG_PT=1 |
700 | * arrived. |
701 | */ |
702 | if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) |
703 | continue; |
704 | /* |
705 | * Look for a matching Initiator Node ACL in ASCII format |
706 | */ |
707 | if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) |
708 | continue; |
709 | |
710 | atomic_inc(&deve_tmp->pr_ref_count); |
711 | smp_mb__after_atomic_inc(); |
712 | spin_unlock_bh(&port->sep_alua_lock); |
713 | /* |
714 | * Grab a configfs group dependency that is released |
715 | * for the exception path at label out: below, or upon |
716 | * completion of adding ALL_TG_PT=1 registrations in |
717 | * __core_scsi3_add_registration() |
718 | */ |
719 | ret = core_scsi3_lunacl_depend_item(deve_tmp); |
720 | if (ret < 0) { |
721 | pr_err("core_scsi3_lunacl_depend" |
722 | "_item() failed\n"); |
723 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
724 | smp_mb__after_atomic_dec(); |
725 | atomic_dec(&deve_tmp->pr_ref_count); |
726 | smp_mb__after_atomic_dec(); |
727 | goto out; |
728 | } |
729 | /* |
730 | * Located a matching SCSI Initiator Port on a different |
731 | * port, allocate the pr_reg_atp and attach it to the |
732 | * pr_reg->pr_reg_atp_list that will be processed once |
733 | * the original *pr_reg is processed in |
734 | * __core_scsi3_add_registration() |
735 | */ |
736 | pr_reg_atp = __core_scsi3_do_alloc_registration(dev, |
737 | nacl_tmp, deve_tmp, NULL, |
738 | sa_res_key, all_tg_pt, aptpl); |
739 | if (!pr_reg_atp) { |
740 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
741 | smp_mb__after_atomic_dec(); |
742 | atomic_dec(&deve_tmp->pr_ref_count); |
743 | smp_mb__after_atomic_dec(); |
744 | core_scsi3_lunacl_undepend_item(deve_tmp); |
745 | goto out; |
746 | } |
747 | |
748 | list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, |
749 | &pr_reg->pr_reg_atp_list); |
750 | spin_lock_bh(&port->sep_alua_lock); |
751 | } |
752 | spin_unlock_bh(&port->sep_alua_lock); |
753 | |
754 | spin_lock(&dev->se_port_lock); |
755 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
756 | smp_mb__after_atomic_dec(); |
757 | } |
758 | spin_unlock(&dev->se_port_lock); |
759 | |
760 | return pr_reg; |
761 | out: |
762 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
763 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { |
764 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
765 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
766 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); |
767 | } |
768 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
769 | return NULL; |
770 | } |
771 | |
772 | int core_scsi3_alloc_aptpl_registration( |
773 | struct t10_reservation *pr_tmpl, |
774 | u64 sa_res_key, |
775 | unsigned char *i_port, |
776 | unsigned char *isid, |
777 | u32 mapped_lun, |
778 | unsigned char *t_port, |
779 | u16 tpgt, |
780 | u32 target_lun, |
781 | int res_holder, |
782 | int all_tg_pt, |
783 | u8 type) |
784 | { |
785 | struct t10_pr_registration *pr_reg; |
786 | |
787 | if (!i_port || !t_port || !sa_res_key) { |
788 | pr_err("Illegal parameters for APTPL registration\n"); |
789 | return -EINVAL; |
790 | } |
791 | |
792 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); |
793 | if (!pr_reg) { |
794 | pr_err("Unable to allocate struct t10_pr_registration\n"); |
795 | return -ENOMEM; |
796 | } |
797 | pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); |
798 | |
799 | INIT_LIST_HEAD(&pr_reg->pr_reg_list); |
800 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); |
801 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); |
802 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); |
803 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); |
804 | atomic_set(&pr_reg->pr_res_holders, 0); |
805 | pr_reg->pr_reg_nacl = NULL; |
806 | pr_reg->pr_reg_deve = NULL; |
807 | pr_reg->pr_res_mapped_lun = mapped_lun; |
808 | pr_reg->pr_aptpl_target_lun = target_lun; |
809 | pr_reg->pr_res_key = sa_res_key; |
810 | pr_reg->pr_reg_all_tg_pt = all_tg_pt; |
811 | pr_reg->pr_reg_aptpl = 1; |
812 | pr_reg->pr_reg_tg_pt_lun = NULL; |
813 | pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ |
814 | pr_reg->pr_res_type = type; |
815 | /* |
816 | * If an ISID value had been saved in APTPL metadata for this |
817 | * SCSI Initiator Port, restore it now. |
818 | */ |
819 | if (isid != NULL) { |
820 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); |
821 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); |
822 | pr_reg->isid_present_at_reg = 1; |
823 | } |
824 | /* |
825 | * Copy the i_port and t_port information from caller. |
826 | */ |
827 | snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); |
828 | snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); |
829 | pr_reg->pr_reg_tpgt = tpgt; |
830 | /* |
831 | * Set pr_res_holder from caller, the pr_reg who is the reservation |
832 | * holder will get it's pointer set in core_scsi3_aptpl_reserve() once |
833 | * the Initiator Node LUN ACL from the fabric module is created for |
834 | * this registration. |
835 | */ |
836 | pr_reg->pr_res_holder = res_holder; |
837 | |
838 | list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); |
839 | pr_debug("SPC-3 PR APTPL Successfully added registration%s from" |
840 | " metadata\n", (res_holder) ? "+reservation" : ""); |
841 | return 0; |
842 | } |
843 | |
844 | static void core_scsi3_aptpl_reserve( |
845 | struct se_device *dev, |
846 | struct se_portal_group *tpg, |
847 | struct se_node_acl *node_acl, |
848 | struct t10_pr_registration *pr_reg) |
849 | { |
850 | char i_buf[PR_REG_ISID_ID_LEN]; |
851 | int prf_isid; |
852 | |
853 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
854 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
855 | PR_REG_ISID_ID_LEN); |
856 | |
857 | spin_lock(&dev->dev_reservation_lock); |
858 | dev->dev_pr_res_holder = pr_reg; |
859 | spin_unlock(&dev->dev_reservation_lock); |
860 | |
861 | pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" |
862 | " new reservation holder TYPE: %s ALL_TG_PT: %d\n", |
863 | tpg->se_tpg_tfo->get_fabric_name(), |
864 | core_scsi3_pr_dump_type(pr_reg->pr_res_type), |
865 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
866 | pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", |
867 | tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, |
868 | (prf_isid) ? &i_buf[0] : ""); |
869 | } |
870 | |
871 | static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, |
872 | struct t10_pr_registration *, int, int); |
873 | |
874 | static int __core_scsi3_check_aptpl_registration( |
875 | struct se_device *dev, |
876 | struct se_portal_group *tpg, |
877 | struct se_lun *lun, |
878 | u32 target_lun, |
879 | struct se_node_acl *nacl, |
880 | struct se_dev_entry *deve) |
881 | { |
882 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
883 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
884 | unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; |
885 | unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; |
886 | u16 tpgt; |
887 | |
888 | memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); |
889 | memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); |
890 | /* |
891 | * Copy Initiator Port information from struct se_node_acl |
892 | */ |
893 | snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); |
894 | snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", |
895 | tpg->se_tpg_tfo->tpg_get_wwn(tpg)); |
896 | tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); |
897 | /* |
898 | * Look for the matching registrations+reservation from those |
899 | * created from APTPL metadata. Note that multiple registrations |
900 | * may exist for fabrics that use ISIDs in their SCSI Initiator Port |
901 | * TransportIDs. |
902 | */ |
903 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
904 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, |
905 | pr_reg_aptpl_list) { |
906 | if (!strcmp(pr_reg->pr_iport, i_port) && |
907 | (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && |
908 | !(strcmp(pr_reg->pr_tport, t_port)) && |
909 | (pr_reg->pr_reg_tpgt == tpgt) && |
910 | (pr_reg->pr_aptpl_target_lun == target_lun)) { |
911 | |
912 | pr_reg->pr_reg_nacl = nacl; |
913 | pr_reg->pr_reg_deve = deve; |
914 | pr_reg->pr_reg_tg_pt_lun = lun; |
915 | |
916 | list_del(&pr_reg->pr_reg_aptpl_list); |
917 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
918 | /* |
919 | * At this point all of the pointers in *pr_reg will |
920 | * be setup, so go ahead and add the registration. |
921 | */ |
922 | |
923 | __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); |
924 | /* |
925 | * If this registration is the reservation holder, |
926 | * make that happen now.. |
927 | */ |
928 | if (pr_reg->pr_res_holder) |
929 | core_scsi3_aptpl_reserve(dev, tpg, |
930 | nacl, pr_reg); |
931 | /* |
932 | * Reenable pr_aptpl_active to accept new metadata |
933 | * updates once the SCSI device is active again.. |
934 | */ |
935 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
936 | pr_tmpl->pr_aptpl_active = 1; |
937 | } |
938 | } |
939 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
940 | |
941 | return 0; |
942 | } |
943 | |
944 | int core_scsi3_check_aptpl_registration( |
945 | struct se_device *dev, |
946 | struct se_portal_group *tpg, |
947 | struct se_lun *lun, |
948 | struct se_lun_acl *lun_acl) |
949 | { |
950 | struct se_node_acl *nacl = lun_acl->se_lun_nacl; |
951 | struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun]; |
952 | |
953 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) |
954 | return 0; |
955 | |
956 | return __core_scsi3_check_aptpl_registration(dev, tpg, lun, |
957 | lun->unpacked_lun, nacl, deve); |
958 | } |
959 | |
960 | static void __core_scsi3_dump_registration( |
961 | struct target_core_fabric_ops *tfo, |
962 | struct se_device *dev, |
963 | struct se_node_acl *nacl, |
964 | struct t10_pr_registration *pr_reg, |
965 | int register_type) |
966 | { |
967 | struct se_portal_group *se_tpg = nacl->se_tpg; |
968 | char i_buf[PR_REG_ISID_ID_LEN]; |
969 | int prf_isid; |
970 | |
971 | memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); |
972 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
973 | PR_REG_ISID_ID_LEN); |
974 | |
975 | pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" |
976 | " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? |
977 | "_AND_MOVE" : (register_type == 1) ? |
978 | "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, |
979 | (prf_isid) ? i_buf : ""); |
980 | pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", |
981 | tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), |
982 | tfo->tpg_get_tag(se_tpg)); |
983 | pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" |
984 | " Port(s)\n", tfo->get_fabric_name(), |
985 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", |
986 | dev->transport->name); |
987 | pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" |
988 | " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), |
989 | pr_reg->pr_res_key, pr_reg->pr_res_generation, |
990 | pr_reg->pr_reg_aptpl); |
991 | } |
992 | |
993 | /* |
994 | * this function can be called with struct se_device->dev_reservation_lock |
995 | * when register_move = 1 |
996 | */ |
997 | static void __core_scsi3_add_registration( |
998 | struct se_device *dev, |
999 | struct se_node_acl *nacl, |
1000 | struct t10_pr_registration *pr_reg, |
1001 | int register_type, |
1002 | int register_move) |
1003 | { |
1004 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
1005 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; |
1006 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
1007 | |
1008 | /* |
1009 | * Increment PRgeneration counter for struct se_device upon a successful |
1010 | * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action |
1011 | * |
1012 | * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service |
1013 | * action, the struct se_device->dev_reservation_lock will already be held, |
1014 | * so we do not call core_scsi3_pr_generation() which grabs the lock |
1015 | * for the REGISTER. |
1016 | */ |
1017 | pr_reg->pr_res_generation = (register_move) ? |
1018 | dev->t10_pr.pr_generation++ : |
1019 | core_scsi3_pr_generation(dev); |
1020 | |
1021 | spin_lock(&pr_tmpl->registration_lock); |
1022 | list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); |
1023 | pr_reg->pr_reg_deve->def_pr_registered = 1; |
1024 | |
1025 | __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); |
1026 | spin_unlock(&pr_tmpl->registration_lock); |
1027 | /* |
1028 | * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. |
1029 | */ |
1030 | if (!pr_reg->pr_reg_all_tg_pt || register_move) |
1031 | return; |
1032 | /* |
1033 | * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 |
1034 | * allocated in __core_scsi3_alloc_registration() |
1035 | */ |
1036 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
1037 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { |
1038 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
1039 | |
1040 | pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); |
1041 | |
1042 | spin_lock(&pr_tmpl->registration_lock); |
1043 | list_add_tail(&pr_reg_tmp->pr_reg_list, |
1044 | &pr_tmpl->registration_list); |
1045 | pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; |
1046 | |
1047 | __core_scsi3_dump_registration(tfo, dev, |
1048 | pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, |
1049 | register_type); |
1050 | spin_unlock(&pr_tmpl->registration_lock); |
1051 | /* |
1052 | * Drop configfs group dependency reference from |
1053 | * __core_scsi3_alloc_registration() |
1054 | */ |
1055 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
1056 | } |
1057 | } |
1058 | |
1059 | static int core_scsi3_alloc_registration( |
1060 | struct se_device *dev, |
1061 | struct se_node_acl *nacl, |
1062 | struct se_dev_entry *deve, |
1063 | unsigned char *isid, |
1064 | u64 sa_res_key, |
1065 | int all_tg_pt, |
1066 | int aptpl, |
1067 | int register_type, |
1068 | int register_move) |
1069 | { |
1070 | struct t10_pr_registration *pr_reg; |
1071 | |
1072 | pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, |
1073 | sa_res_key, all_tg_pt, aptpl); |
1074 | if (!pr_reg) |
1075 | return -EPERM; |
1076 | |
1077 | __core_scsi3_add_registration(dev, nacl, pr_reg, |
1078 | register_type, register_move); |
1079 | return 0; |
1080 | } |
1081 | |
1082 | static struct t10_pr_registration *__core_scsi3_locate_pr_reg( |
1083 | struct se_device *dev, |
1084 | struct se_node_acl *nacl, |
1085 | unsigned char *isid) |
1086 | { |
1087 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
1088 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
1089 | struct se_portal_group *tpg; |
1090 | |
1091 | spin_lock(&pr_tmpl->registration_lock); |
1092 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
1093 | &pr_tmpl->registration_list, pr_reg_list) { |
1094 | /* |
1095 | * First look for a matching struct se_node_acl |
1096 | */ |
1097 | if (pr_reg->pr_reg_nacl != nacl) |
1098 | continue; |
1099 | |
1100 | tpg = pr_reg->pr_reg_nacl->se_tpg; |
1101 | /* |
1102 | * If this registration does NOT contain a fabric provided |
1103 | * ISID, then we have found a match. |
1104 | */ |
1105 | if (!pr_reg->isid_present_at_reg) { |
1106 | /* |
1107 | * Determine if this SCSI device server requires that |
1108 | * SCSI Intiatior TransportID w/ ISIDs is enforced |
1109 | * for fabric modules (iSCSI) requiring them. |
1110 | */ |
1111 | if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
1112 | if (dev->dev_attrib.enforce_pr_isids) |
1113 | continue; |
1114 | } |
1115 | atomic_inc(&pr_reg->pr_res_holders); |
1116 | smp_mb__after_atomic_inc(); |
1117 | spin_unlock(&pr_tmpl->registration_lock); |
1118 | return pr_reg; |
1119 | } |
1120 | /* |
1121 | * If the *pr_reg contains a fabric defined ISID for multi-value |
1122 | * SCSI Initiator Port TransportIDs, then we expect a valid |
1123 | * matching ISID to be provided by the local SCSI Initiator Port. |
1124 | */ |
1125 | if (!isid) |
1126 | continue; |
1127 | if (strcmp(isid, pr_reg->pr_reg_isid)) |
1128 | continue; |
1129 | |
1130 | atomic_inc(&pr_reg->pr_res_holders); |
1131 | smp_mb__after_atomic_inc(); |
1132 | spin_unlock(&pr_tmpl->registration_lock); |
1133 | return pr_reg; |
1134 | } |
1135 | spin_unlock(&pr_tmpl->registration_lock); |
1136 | |
1137 | return NULL; |
1138 | } |
1139 | |
1140 | static struct t10_pr_registration *core_scsi3_locate_pr_reg( |
1141 | struct se_device *dev, |
1142 | struct se_node_acl *nacl, |
1143 | struct se_session *sess) |
1144 | { |
1145 | struct se_portal_group *tpg = nacl->se_tpg; |
1146 | unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; |
1147 | |
1148 | if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
1149 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
1150 | tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], |
1151 | PR_REG_ISID_LEN); |
1152 | isid_ptr = &buf[0]; |
1153 | } |
1154 | |
1155 | return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); |
1156 | } |
1157 | |
1158 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) |
1159 | { |
1160 | atomic_dec(&pr_reg->pr_res_holders); |
1161 | smp_mb__after_atomic_dec(); |
1162 | } |
1163 | |
1164 | static int core_scsi3_check_implict_release( |
1165 | struct se_device *dev, |
1166 | struct t10_pr_registration *pr_reg) |
1167 | { |
1168 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl; |
1169 | struct t10_pr_registration *pr_res_holder; |
1170 | int ret = 0; |
1171 | |
1172 | spin_lock(&dev->dev_reservation_lock); |
1173 | pr_res_holder = dev->dev_pr_res_holder; |
1174 | if (!pr_res_holder) { |
1175 | spin_unlock(&dev->dev_reservation_lock); |
1176 | return ret; |
1177 | } |
1178 | if (pr_res_holder == pr_reg) { |
1179 | /* |
1180 | * Perform an implict RELEASE if the registration that |
1181 | * is being released is holding the reservation. |
1182 | * |
1183 | * From spc4r17, section 5.7.11.1: |
1184 | * |
1185 | * e) If the I_T nexus is the persistent reservation holder |
1186 | * and the persistent reservation is not an all registrants |
1187 | * type, then a PERSISTENT RESERVE OUT command with REGISTER |
1188 | * service action or REGISTER AND IGNORE EXISTING KEY |
1189 | * service action with the SERVICE ACTION RESERVATION KEY |
1190 | * field set to zero (see 5.7.11.3). |
1191 | */ |
1192 | __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); |
1193 | ret = 1; |
1194 | /* |
1195 | * For 'All Registrants' reservation types, all existing |
1196 | * registrations are still processed as reservation holders |
1197 | * in core_scsi3_pr_seq_non_holder() after the initial |
1198 | * reservation holder is implictly released here. |
1199 | */ |
1200 | } else if (pr_reg->pr_reg_all_tg_pt && |
1201 | (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, |
1202 | pr_reg->pr_reg_nacl->initiatorname)) && |
1203 | (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { |
1204 | pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" |
1205 | " UNREGISTER while existing reservation with matching" |
1206 | " key 0x%016Lx is present from another SCSI Initiator" |
1207 | " Port\n", pr_reg->pr_res_key); |
1208 | ret = -EPERM; |
1209 | } |
1210 | spin_unlock(&dev->dev_reservation_lock); |
1211 | |
1212 | return ret; |
1213 | } |
1214 | |
1215 | /* |
1216 | * Called with struct t10_reservation->registration_lock held. |
1217 | */ |
1218 | static void __core_scsi3_free_registration( |
1219 | struct se_device *dev, |
1220 | struct t10_pr_registration *pr_reg, |
1221 | struct list_head *preempt_and_abort_list, |
1222 | int dec_holders) |
1223 | { |
1224 | struct target_core_fabric_ops *tfo = |
1225 | pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; |
1226 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
1227 | char i_buf[PR_REG_ISID_ID_LEN]; |
1228 | int prf_isid; |
1229 | |
1230 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
1231 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
1232 | PR_REG_ISID_ID_LEN); |
1233 | |
1234 | pr_reg->pr_reg_deve->def_pr_registered = 0; |
1235 | pr_reg->pr_reg_deve->pr_res_key = 0; |
1236 | list_del(&pr_reg->pr_reg_list); |
1237 | /* |
1238 | * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), |
1239 | * so call core_scsi3_put_pr_reg() to decrement our reference. |
1240 | */ |
1241 | if (dec_holders) |
1242 | core_scsi3_put_pr_reg(pr_reg); |
1243 | /* |
1244 | * Wait until all reference from any other I_T nexuses for this |
1245 | * *pr_reg have been released. Because list_del() is called above, |
1246 | * the last core_scsi3_put_pr_reg(pr_reg) will release this reference |
1247 | * count back to zero, and we release *pr_reg. |
1248 | */ |
1249 | while (atomic_read(&pr_reg->pr_res_holders) != 0) { |
1250 | spin_unlock(&pr_tmpl->registration_lock); |
1251 | pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", |
1252 | tfo->get_fabric_name()); |
1253 | cpu_relax(); |
1254 | spin_lock(&pr_tmpl->registration_lock); |
1255 | } |
1256 | |
1257 | pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" |
1258 | " Node: %s%s\n", tfo->get_fabric_name(), |
1259 | pr_reg->pr_reg_nacl->initiatorname, |
1260 | (prf_isid) ? &i_buf[0] : ""); |
1261 | pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" |
1262 | " Port(s)\n", tfo->get_fabric_name(), |
1263 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", |
1264 | dev->transport->name); |
1265 | pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" |
1266 | " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, |
1267 | pr_reg->pr_res_generation); |
1268 | |
1269 | if (!preempt_and_abort_list) { |
1270 | pr_reg->pr_reg_deve = NULL; |
1271 | pr_reg->pr_reg_nacl = NULL; |
1272 | kfree(pr_reg->pr_aptpl_buf); |
1273 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
1274 | return; |
1275 | } |
1276 | /* |
1277 | * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list |
1278 | * are released once the ABORT_TASK_SET has completed.. |
1279 | */ |
1280 | list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); |
1281 | } |
1282 | |
1283 | void core_scsi3_free_pr_reg_from_nacl( |
1284 | struct se_device *dev, |
1285 | struct se_node_acl *nacl) |
1286 | { |
1287 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
1288 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; |
1289 | /* |
1290 | * If the passed se_node_acl matches the reservation holder, |
1291 | * release the reservation. |
1292 | */ |
1293 | spin_lock(&dev->dev_reservation_lock); |
1294 | pr_res_holder = dev->dev_pr_res_holder; |
1295 | if ((pr_res_holder != NULL) && |
1296 | (pr_res_holder->pr_reg_nacl == nacl)) |
1297 | __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); |
1298 | spin_unlock(&dev->dev_reservation_lock); |
1299 | /* |
1300 | * Release any registration associated with the struct se_node_acl. |
1301 | */ |
1302 | spin_lock(&pr_tmpl->registration_lock); |
1303 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
1304 | &pr_tmpl->registration_list, pr_reg_list) { |
1305 | |
1306 | if (pr_reg->pr_reg_nacl != nacl) |
1307 | continue; |
1308 | |
1309 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0); |
1310 | } |
1311 | spin_unlock(&pr_tmpl->registration_lock); |
1312 | } |
1313 | |
1314 | void core_scsi3_free_all_registrations( |
1315 | struct se_device *dev) |
1316 | { |
1317 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
1318 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; |
1319 | |
1320 | spin_lock(&dev->dev_reservation_lock); |
1321 | pr_res_holder = dev->dev_pr_res_holder; |
1322 | if (pr_res_holder != NULL) { |
1323 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
1324 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
1325 | pr_res_holder, 0); |
1326 | } |
1327 | spin_unlock(&dev->dev_reservation_lock); |
1328 | |
1329 | spin_lock(&pr_tmpl->registration_lock); |
1330 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
1331 | &pr_tmpl->registration_list, pr_reg_list) { |
1332 | |
1333 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0); |
1334 | } |
1335 | spin_unlock(&pr_tmpl->registration_lock); |
1336 | |
1337 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
1338 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, |
1339 | pr_reg_aptpl_list) { |
1340 | list_del(&pr_reg->pr_reg_aptpl_list); |
1341 | kfree(pr_reg->pr_aptpl_buf); |
1342 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
1343 | } |
1344 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
1345 | } |
1346 | |
1347 | static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) |
1348 | { |
1349 | return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, |
1350 | &tpg->tpg_group.cg_item); |
1351 | } |
1352 | |
1353 | static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) |
1354 | { |
1355 | configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, |
1356 | &tpg->tpg_group.cg_item); |
1357 | |
1358 | atomic_dec(&tpg->tpg_pr_ref_count); |
1359 | smp_mb__after_atomic_dec(); |
1360 | } |
1361 | |
1362 | static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) |
1363 | { |
1364 | struct se_portal_group *tpg = nacl->se_tpg; |
1365 | |
1366 | if (nacl->dynamic_node_acl) |
1367 | return 0; |
1368 | |
1369 | return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, |
1370 | &nacl->acl_group.cg_item); |
1371 | } |
1372 | |
1373 | static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) |
1374 | { |
1375 | struct se_portal_group *tpg = nacl->se_tpg; |
1376 | |
1377 | if (nacl->dynamic_node_acl) { |
1378 | atomic_dec(&nacl->acl_pr_ref_count); |
1379 | smp_mb__after_atomic_dec(); |
1380 | return; |
1381 | } |
1382 | |
1383 | configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, |
1384 | &nacl->acl_group.cg_item); |
1385 | |
1386 | atomic_dec(&nacl->acl_pr_ref_count); |
1387 | smp_mb__after_atomic_dec(); |
1388 | } |
1389 | |
1390 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) |
1391 | { |
1392 | struct se_lun_acl *lun_acl = se_deve->se_lun_acl; |
1393 | struct se_node_acl *nacl; |
1394 | struct se_portal_group *tpg; |
1395 | /* |
1396 | * For nacl->dynamic_node_acl=1 |
1397 | */ |
1398 | if (!lun_acl) |
1399 | return 0; |
1400 | |
1401 | nacl = lun_acl->se_lun_nacl; |
1402 | tpg = nacl->se_tpg; |
1403 | |
1404 | return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, |
1405 | &lun_acl->se_lun_group.cg_item); |
1406 | } |
1407 | |
1408 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) |
1409 | { |
1410 | struct se_lun_acl *lun_acl = se_deve->se_lun_acl; |
1411 | struct se_node_acl *nacl; |
1412 | struct se_portal_group *tpg; |
1413 | /* |
1414 | * For nacl->dynamic_node_acl=1 |
1415 | */ |
1416 | if (!lun_acl) { |
1417 | atomic_dec(&se_deve->pr_ref_count); |
1418 | smp_mb__after_atomic_dec(); |
1419 | return; |
1420 | } |
1421 | nacl = lun_acl->se_lun_nacl; |
1422 | tpg = nacl->se_tpg; |
1423 | |
1424 | configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, |
1425 | &lun_acl->se_lun_group.cg_item); |
1426 | |
1427 | atomic_dec(&se_deve->pr_ref_count); |
1428 | smp_mb__after_atomic_dec(); |
1429 | } |
1430 | |
1431 | static sense_reason_t |
1432 | core_scsi3_decode_spec_i_port( |
1433 | struct se_cmd *cmd, |
1434 | struct se_portal_group *tpg, |
1435 | unsigned char *l_isid, |
1436 | u64 sa_res_key, |
1437 | int all_tg_pt, |
1438 | int aptpl) |
1439 | { |
1440 | struct se_device *dev = cmd->se_dev; |
1441 | struct se_port *tmp_port; |
1442 | struct se_portal_group *dest_tpg = NULL, *tmp_tpg; |
1443 | struct se_session *se_sess = cmd->se_sess; |
1444 | struct se_node_acl *dest_node_acl = NULL; |
1445 | struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; |
1446 | struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; |
1447 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; |
1448 | LIST_HEAD(tid_dest_list); |
1449 | struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; |
1450 | struct target_core_fabric_ops *tmp_tf_ops; |
1451 | unsigned char *buf; |
1452 | unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; |
1453 | char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; |
1454 | sense_reason_t ret; |
1455 | u32 tpdl, tid_len = 0; |
1456 | int dest_local_nexus, prf_isid; |
1457 | u32 dest_rtpi = 0; |
1458 | |
1459 | memset(dest_iport, 0, 64); |
1460 | |
1461 | local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
1462 | /* |
1463 | * Allocate a struct pr_transport_id_holder and setup the |
1464 | * local_node_acl and local_se_deve pointers and add to |
1465 | * struct list_head tid_dest_list for add registration |
1466 | * processing in the loop of tid_dest_list below. |
1467 | */ |
1468 | tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); |
1469 | if (!tidh_new) { |
1470 | pr_err("Unable to allocate tidh_new\n"); |
1471 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1472 | } |
1473 | INIT_LIST_HEAD(&tidh_new->dest_list); |
1474 | tidh_new->dest_tpg = tpg; |
1475 | tidh_new->dest_node_acl = se_sess->se_node_acl; |
1476 | tidh_new->dest_se_deve = local_se_deve; |
1477 | |
1478 | local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, |
1479 | se_sess->se_node_acl, local_se_deve, l_isid, |
1480 | sa_res_key, all_tg_pt, aptpl); |
1481 | if (!local_pr_reg) { |
1482 | kfree(tidh_new); |
1483 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1484 | } |
1485 | tidh_new->dest_pr_reg = local_pr_reg; |
1486 | /* |
1487 | * The local I_T nexus does not hold any configfs dependances, |
1488 | * so we set tid_h->dest_local_nexus=1 to prevent the |
1489 | * configfs_undepend_item() calls in the tid_dest_list loops below. |
1490 | */ |
1491 | tidh_new->dest_local_nexus = 1; |
1492 | list_add_tail(&tidh_new->dest_list, &tid_dest_list); |
1493 | |
1494 | if (cmd->data_length < 28) { |
1495 | pr_warn("SPC-PR: Received PR OUT parameter list" |
1496 | " length too small: %u\n", cmd->data_length); |
1497 | ret = TCM_INVALID_PARAMETER_LIST; |
1498 | goto out; |
1499 | } |
1500 | |
1501 | buf = transport_kmap_data_sg(cmd); |
1502 | if (!buf) { |
1503 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1504 | goto out; |
1505 | } |
1506 | |
1507 | /* |
1508 | * For a PERSISTENT RESERVE OUT specify initiator ports payload, |
1509 | * first extract TransportID Parameter Data Length, and make sure |
1510 | * the value matches up to the SCSI expected data transfer length. |
1511 | */ |
1512 | tpdl = (buf[24] & 0xff) << 24; |
1513 | tpdl |= (buf[25] & 0xff) << 16; |
1514 | tpdl |= (buf[26] & 0xff) << 8; |
1515 | tpdl |= buf[27] & 0xff; |
1516 | |
1517 | if ((tpdl + 28) != cmd->data_length) { |
1518 | pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" |
1519 | " does not equal CDB data_length: %u\n", tpdl, |
1520 | cmd->data_length); |
1521 | ret = TCM_INVALID_PARAMETER_LIST; |
1522 | goto out_unmap; |
1523 | } |
1524 | /* |
1525 | * Start processing the received transport IDs using the |
1526 | * receiving I_T Nexus portal's fabric dependent methods to |
1527 | * obtain the SCSI Initiator Port/Device Identifiers. |
1528 | */ |
1529 | ptr = &buf[28]; |
1530 | |
1531 | while (tpdl > 0) { |
1532 | proto_ident = (ptr[0] & 0x0f); |
1533 | dest_tpg = NULL; |
1534 | |
1535 | spin_lock(&dev->se_port_lock); |
1536 | list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { |
1537 | tmp_tpg = tmp_port->sep_tpg; |
1538 | if (!tmp_tpg) |
1539 | continue; |
1540 | tmp_tf_ops = tmp_tpg->se_tpg_tfo; |
1541 | if (!tmp_tf_ops) |
1542 | continue; |
1543 | if (!tmp_tf_ops->get_fabric_proto_ident || |
1544 | !tmp_tf_ops->tpg_parse_pr_out_transport_id) |
1545 | continue; |
1546 | /* |
1547 | * Look for the matching proto_ident provided by |
1548 | * the received TransportID |
1549 | */ |
1550 | tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); |
1551 | if (tmp_proto_ident != proto_ident) |
1552 | continue; |
1553 | dest_rtpi = tmp_port->sep_rtpi; |
1554 | |
1555 | i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( |
1556 | tmp_tpg, (const char *)ptr, &tid_len, |
1557 | &iport_ptr); |
1558 | if (!i_str) |
1559 | continue; |
1560 | |
1561 | atomic_inc(&tmp_tpg->tpg_pr_ref_count); |
1562 | smp_mb__after_atomic_inc(); |
1563 | spin_unlock(&dev->se_port_lock); |
1564 | |
1565 | if (core_scsi3_tpg_depend_item(tmp_tpg)) { |
1566 | pr_err(" core_scsi3_tpg_depend_item()" |
1567 | " for tmp_tpg\n"); |
1568 | atomic_dec(&tmp_tpg->tpg_pr_ref_count); |
1569 | smp_mb__after_atomic_dec(); |
1570 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1571 | goto out_unmap; |
1572 | } |
1573 | /* |
1574 | * Locate the destination initiator ACL to be registered |
1575 | * from the decoded fabric module specific TransportID |
1576 | * at *i_str. |
1577 | */ |
1578 | spin_lock_irq(&tmp_tpg->acl_node_lock); |
1579 | dest_node_acl = __core_tpg_get_initiator_node_acl( |
1580 | tmp_tpg, i_str); |
1581 | if (dest_node_acl) { |
1582 | atomic_inc(&dest_node_acl->acl_pr_ref_count); |
1583 | smp_mb__after_atomic_inc(); |
1584 | } |
1585 | spin_unlock_irq(&tmp_tpg->acl_node_lock); |
1586 | |
1587 | if (!dest_node_acl) { |
1588 | core_scsi3_tpg_undepend_item(tmp_tpg); |
1589 | spin_lock(&dev->se_port_lock); |
1590 | continue; |
1591 | } |
1592 | |
1593 | if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { |
1594 | pr_err("configfs_depend_item() failed" |
1595 | " for dest_node_acl->acl_group\n"); |
1596 | atomic_dec(&dest_node_acl->acl_pr_ref_count); |
1597 | smp_mb__after_atomic_dec(); |
1598 | core_scsi3_tpg_undepend_item(tmp_tpg); |
1599 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1600 | goto out_unmap; |
1601 | } |
1602 | |
1603 | dest_tpg = tmp_tpg; |
1604 | pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" |
1605 | " %s Port RTPI: %hu\n", |
1606 | dest_tpg->se_tpg_tfo->get_fabric_name(), |
1607 | dest_node_acl->initiatorname, dest_rtpi); |
1608 | |
1609 | spin_lock(&dev->se_port_lock); |
1610 | break; |
1611 | } |
1612 | spin_unlock(&dev->se_port_lock); |
1613 | |
1614 | if (!dest_tpg) { |
1615 | pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" |
1616 | " dest_tpg\n"); |
1617 | ret = TCM_INVALID_PARAMETER_LIST; |
1618 | goto out_unmap; |
1619 | } |
1620 | |
1621 | pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" |
1622 | " tid_len: %d for %s + %s\n", |
1623 | dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, |
1624 | tpdl, tid_len, i_str, iport_ptr); |
1625 | |
1626 | if (tid_len > tpdl) { |
1627 | pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" |
1628 | " %u for Transport ID: %s\n", tid_len, ptr); |
1629 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1630 | core_scsi3_tpg_undepend_item(dest_tpg); |
1631 | ret = TCM_INVALID_PARAMETER_LIST; |
1632 | goto out_unmap; |
1633 | } |
1634 | /* |
1635 | * Locate the desintation struct se_dev_entry pointer for matching |
1636 | * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus |
1637 | * Target Port. |
1638 | */ |
1639 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, |
1640 | dest_rtpi); |
1641 | if (!dest_se_deve) { |
1642 | pr_err("Unable to locate %s dest_se_deve" |
1643 | " from destination RTPI: %hu\n", |
1644 | dest_tpg->se_tpg_tfo->get_fabric_name(), |
1645 | dest_rtpi); |
1646 | |
1647 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1648 | core_scsi3_tpg_undepend_item(dest_tpg); |
1649 | ret = TCM_INVALID_PARAMETER_LIST; |
1650 | goto out_unmap; |
1651 | } |
1652 | |
1653 | if (core_scsi3_lunacl_depend_item(dest_se_deve)) { |
1654 | pr_err("core_scsi3_lunacl_depend_item()" |
1655 | " failed\n"); |
1656 | atomic_dec(&dest_se_deve->pr_ref_count); |
1657 | smp_mb__after_atomic_dec(); |
1658 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1659 | core_scsi3_tpg_undepend_item(dest_tpg); |
1660 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1661 | goto out_unmap; |
1662 | } |
1663 | |
1664 | pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" |
1665 | " dest_se_deve mapped_lun: %u\n", |
1666 | dest_tpg->se_tpg_tfo->get_fabric_name(), |
1667 | dest_node_acl->initiatorname, dest_se_deve->mapped_lun); |
1668 | |
1669 | /* |
1670 | * Skip any TransportIDs that already have a registration for |
1671 | * this target port. |
1672 | */ |
1673 | pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
1674 | iport_ptr); |
1675 | if (pr_reg_e) { |
1676 | core_scsi3_put_pr_reg(pr_reg_e); |
1677 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
1678 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1679 | core_scsi3_tpg_undepend_item(dest_tpg); |
1680 | ptr += tid_len; |
1681 | tpdl -= tid_len; |
1682 | tid_len = 0; |
1683 | continue; |
1684 | } |
1685 | /* |
1686 | * Allocate a struct pr_transport_id_holder and setup |
1687 | * the dest_node_acl and dest_se_deve pointers for the |
1688 | * loop below. |
1689 | */ |
1690 | tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), |
1691 | GFP_KERNEL); |
1692 | if (!tidh_new) { |
1693 | pr_err("Unable to allocate tidh_new\n"); |
1694 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
1695 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1696 | core_scsi3_tpg_undepend_item(dest_tpg); |
1697 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
1698 | goto out_unmap; |
1699 | } |
1700 | INIT_LIST_HEAD(&tidh_new->dest_list); |
1701 | tidh_new->dest_tpg = dest_tpg; |
1702 | tidh_new->dest_node_acl = dest_node_acl; |
1703 | tidh_new->dest_se_deve = dest_se_deve; |
1704 | |
1705 | /* |
1706 | * Allocate, but do NOT add the registration for the |
1707 | * TransportID referenced SCSI Initiator port. This |
1708 | * done because of the following from spc4r17 in section |
1709 | * 6.14.3 wrt SPEC_I_PT: |
1710 | * |
1711 | * "If a registration fails for any initiator port (e.g., if th |
1712 | * logical unit does not have enough resources available to |
1713 | * hold the registration information), no registrations shall be |
1714 | * made, and the command shall be terminated with |
1715 | * CHECK CONDITION status." |
1716 | * |
1717 | * That means we call __core_scsi3_alloc_registration() here, |
1718 | * and then call __core_scsi3_add_registration() in the |
1719 | * 2nd loop which will never fail. |
1720 | */ |
1721 | dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, |
1722 | dest_node_acl, dest_se_deve, iport_ptr, |
1723 | sa_res_key, all_tg_pt, aptpl); |
1724 | if (!dest_pr_reg) { |
1725 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
1726 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1727 | core_scsi3_tpg_undepend_item(dest_tpg); |
1728 | kfree(tidh_new); |
1729 | ret = TCM_INVALID_PARAMETER_LIST; |
1730 | goto out_unmap; |
1731 | } |
1732 | tidh_new->dest_pr_reg = dest_pr_reg; |
1733 | list_add_tail(&tidh_new->dest_list, &tid_dest_list); |
1734 | |
1735 | ptr += tid_len; |
1736 | tpdl -= tid_len; |
1737 | tid_len = 0; |
1738 | |
1739 | } |
1740 | |
1741 | transport_kunmap_data_sg(cmd); |
1742 | |
1743 | /* |
1744 | * Go ahead and create a registrations from tid_dest_list for the |
1745 | * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl |
1746 | * and dest_se_deve. |
1747 | * |
1748 | * The SA Reservation Key from the PROUT is set for the |
1749 | * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 |
1750 | * means that the TransportID Initiator port will be |
1751 | * registered on all of the target ports in the SCSI target device |
1752 | * ALL_TG_PT=0 means the registration will only be for the |
1753 | * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 |
1754 | * was received. |
1755 | */ |
1756 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { |
1757 | dest_tpg = tidh->dest_tpg; |
1758 | dest_node_acl = tidh->dest_node_acl; |
1759 | dest_se_deve = tidh->dest_se_deve; |
1760 | dest_pr_reg = tidh->dest_pr_reg; |
1761 | dest_local_nexus = tidh->dest_local_nexus; |
1762 | |
1763 | list_del(&tidh->dest_list); |
1764 | kfree(tidh); |
1765 | |
1766 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
1767 | prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], |
1768 | PR_REG_ISID_ID_LEN); |
1769 | |
1770 | __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, |
1771 | dest_pr_reg, 0, 0); |
1772 | |
1773 | pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" |
1774 | " registered Transport ID for Node: %s%s Mapped LUN:" |
1775 | " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), |
1776 | dest_node_acl->initiatorname, (prf_isid) ? |
1777 | &i_buf[0] : "", dest_se_deve->mapped_lun); |
1778 | |
1779 | if (dest_local_nexus) |
1780 | continue; |
1781 | |
1782 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
1783 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1784 | core_scsi3_tpg_undepend_item(dest_tpg); |
1785 | } |
1786 | |
1787 | return 0; |
1788 | out_unmap: |
1789 | transport_kunmap_data_sg(cmd); |
1790 | out: |
1791 | /* |
1792 | * For the failure case, release everything from tid_dest_list |
1793 | * including *dest_pr_reg and the configfs dependances.. |
1794 | */ |
1795 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { |
1796 | dest_tpg = tidh->dest_tpg; |
1797 | dest_node_acl = tidh->dest_node_acl; |
1798 | dest_se_deve = tidh->dest_se_deve; |
1799 | dest_pr_reg = tidh->dest_pr_reg; |
1800 | dest_local_nexus = tidh->dest_local_nexus; |
1801 | |
1802 | list_del(&tidh->dest_list); |
1803 | kfree(tidh); |
1804 | /* |
1805 | * Release any extra ALL_TG_PT=1 registrations for |
1806 | * the SPEC_I_PT=1 case. |
1807 | */ |
1808 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
1809 | &dest_pr_reg->pr_reg_atp_list, |
1810 | pr_reg_atp_mem_list) { |
1811 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
1812 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
1813 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); |
1814 | } |
1815 | |
1816 | kfree(dest_pr_reg->pr_aptpl_buf); |
1817 | kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); |
1818 | |
1819 | if (dest_local_nexus) |
1820 | continue; |
1821 | |
1822 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
1823 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
1824 | core_scsi3_tpg_undepend_item(dest_tpg); |
1825 | } |
1826 | return ret; |
1827 | } |
1828 | |
1829 | /* |
1830 | * Called with struct se_device->dev_reservation_lock held |
1831 | */ |
1832 | static int __core_scsi3_update_aptpl_buf( |
1833 | struct se_device *dev, |
1834 | unsigned char *buf, |
1835 | u32 pr_aptpl_buf_len, |
1836 | int clear_aptpl_metadata) |
1837 | { |
1838 | struct se_lun *lun; |
1839 | struct se_portal_group *tpg; |
1840 | struct t10_pr_registration *pr_reg; |
1841 | unsigned char tmp[512], isid_buf[32]; |
1842 | ssize_t len = 0; |
1843 | int reg_count = 0; |
1844 | |
1845 | memset(buf, 0, pr_aptpl_buf_len); |
1846 | /* |
1847 | * Called to clear metadata once APTPL has been deactivated. |
1848 | */ |
1849 | if (clear_aptpl_metadata) { |
1850 | snprintf(buf, pr_aptpl_buf_len, |
1851 | "No Registrations or Reservations\n"); |
1852 | return 0; |
1853 | } |
1854 | /* |
1855 | * Walk the registration list.. |
1856 | */ |
1857 | spin_lock(&dev->t10_pr.registration_lock); |
1858 | list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, |
1859 | pr_reg_list) { |
1860 | |
1861 | tmp[0] = '\0'; |
1862 | isid_buf[0] = '\0'; |
1863 | tpg = pr_reg->pr_reg_nacl->se_tpg; |
1864 | lun = pr_reg->pr_reg_tg_pt_lun; |
1865 | /* |
1866 | * Write out any ISID value to APTPL metadata that was included |
1867 | * in the original registration. |
1868 | */ |
1869 | if (pr_reg->isid_present_at_reg) |
1870 | snprintf(isid_buf, 32, "initiator_sid=%s\n", |
1871 | pr_reg->pr_reg_isid); |
1872 | /* |
1873 | * Include special metadata if the pr_reg matches the |
1874 | * reservation holder. |
1875 | */ |
1876 | if (dev->dev_pr_res_holder == pr_reg) { |
1877 | snprintf(tmp, 512, "PR_REG_START: %d" |
1878 | "\ninitiator_fabric=%s\n" |
1879 | "initiator_node=%s\n%s" |
1880 | "sa_res_key=%llu\n" |
1881 | "res_holder=1\nres_type=%02x\n" |
1882 | "res_scope=%02x\nres_all_tg_pt=%d\n" |
1883 | "mapped_lun=%u\n", reg_count, |
1884 | tpg->se_tpg_tfo->get_fabric_name(), |
1885 | pr_reg->pr_reg_nacl->initiatorname, isid_buf, |
1886 | pr_reg->pr_res_key, pr_reg->pr_res_type, |
1887 | pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, |
1888 | pr_reg->pr_res_mapped_lun); |
1889 | } else { |
1890 | snprintf(tmp, 512, "PR_REG_START: %d\n" |
1891 | "initiator_fabric=%s\ninitiator_node=%s\n%s" |
1892 | "sa_res_key=%llu\nres_holder=0\n" |
1893 | "res_all_tg_pt=%d\nmapped_lun=%u\n", |
1894 | reg_count, tpg->se_tpg_tfo->get_fabric_name(), |
1895 | pr_reg->pr_reg_nacl->initiatorname, isid_buf, |
1896 | pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, |
1897 | pr_reg->pr_res_mapped_lun); |
1898 | } |
1899 | |
1900 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { |
1901 | pr_err("Unable to update renaming" |
1902 | " APTPL metadata\n"); |
1903 | spin_unlock(&dev->t10_pr.registration_lock); |
1904 | return -EMSGSIZE; |
1905 | } |
1906 | len += sprintf(buf+len, "%s", tmp); |
1907 | |
1908 | /* |
1909 | * Include information about the associated SCSI target port. |
1910 | */ |
1911 | snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" |
1912 | "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" |
1913 | " %d\n", tpg->se_tpg_tfo->get_fabric_name(), |
1914 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1915 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
1916 | lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); |
1917 | |
1918 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { |
1919 | pr_err("Unable to update renaming" |
1920 | " APTPL metadata\n"); |
1921 | spin_unlock(&dev->t10_pr.registration_lock); |
1922 | return -EMSGSIZE; |
1923 | } |
1924 | len += sprintf(buf+len, "%s", tmp); |
1925 | reg_count++; |
1926 | } |
1927 | spin_unlock(&dev->t10_pr.registration_lock); |
1928 | |
1929 | if (!reg_count) |
1930 | len += sprintf(buf+len, "No Registrations or Reservations"); |
1931 | |
1932 | return 0; |
1933 | } |
1934 | |
1935 | static int core_scsi3_update_aptpl_buf( |
1936 | struct se_device *dev, |
1937 | unsigned char *buf, |
1938 | u32 pr_aptpl_buf_len, |
1939 | int clear_aptpl_metadata) |
1940 | { |
1941 | int ret; |
1942 | |
1943 | spin_lock(&dev->dev_reservation_lock); |
1944 | ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, |
1945 | clear_aptpl_metadata); |
1946 | spin_unlock(&dev->dev_reservation_lock); |
1947 | |
1948 | return ret; |
1949 | } |
1950 | |
1951 | /* |
1952 | * Called with struct se_device->aptpl_file_mutex held |
1953 | */ |
1954 | static int __core_scsi3_write_aptpl_to_file( |
1955 | struct se_device *dev, |
1956 | unsigned char *buf, |
1957 | u32 pr_aptpl_buf_len) |
1958 | { |
1959 | struct t10_wwn *wwn = &dev->t10_wwn; |
1960 | struct file *file; |
1961 | int flags = O_RDWR | O_CREAT | O_TRUNC; |
1962 | char path[512]; |
1963 | int ret; |
1964 | |
1965 | memset(path, 0, 512); |
1966 | |
1967 | if (strlen(&wwn->unit_serial[0]) >= 512) { |
1968 | pr_err("WWN value for struct se_device does not fit" |
1969 | " into path buffer\n"); |
1970 | return -EMSGSIZE; |
1971 | } |
1972 | |
1973 | snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); |
1974 | file = filp_open(path, flags, 0600); |
1975 | if (IS_ERR(file)) { |
1976 | pr_err("filp_open(%s) for APTPL metadata" |
1977 | " failed\n", path); |
1978 | return PTR_ERR(file); |
1979 | } |
1980 | |
1981 | if (!pr_aptpl_buf_len) |
1982 | pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ |
1983 | |
1984 | ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); |
1985 | |
1986 | if (ret < 0) |
1987 | pr_debug("Error writing APTPL metadata file: %s\n", path); |
1988 | fput(file); |
1989 | |
1990 | return ret ? -EIO : 0; |
1991 | } |
1992 | |
1993 | static int |
1994 | core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf, |
1995 | u32 in_pr_aptpl_buf_len) |
1996 | { |
1997 | unsigned char null_buf[64], *buf; |
1998 | u32 pr_aptpl_buf_len; |
1999 | int clear_aptpl_metadata = 0; |
2000 | int ret; |
2001 | |
2002 | /* |
2003 | * Can be called with a NULL pointer from PROUT service action CLEAR |
2004 | */ |
2005 | if (!in_buf) { |
2006 | memset(null_buf, 0, 64); |
2007 | buf = &null_buf[0]; |
2008 | /* |
2009 | * This will clear the APTPL metadata to: |
2010 | * "No Registrations or Reservations" status |
2011 | */ |
2012 | pr_aptpl_buf_len = 64; |
2013 | clear_aptpl_metadata = 1; |
2014 | } else { |
2015 | buf = in_buf; |
2016 | pr_aptpl_buf_len = in_pr_aptpl_buf_len; |
2017 | } |
2018 | |
2019 | ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, |
2020 | clear_aptpl_metadata); |
2021 | if (ret != 0) |
2022 | return ret; |
2023 | |
2024 | /* |
2025 | * __core_scsi3_write_aptpl_to_file() will call strlen() |
2026 | * on the passed buf to determine pr_aptpl_buf_len. |
2027 | */ |
2028 | return __core_scsi3_write_aptpl_to_file(dev, buf, 0); |
2029 | } |
2030 | |
2031 | static sense_reason_t |
2032 | core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, |
2033 | int aptpl, int all_tg_pt, int spec_i_pt, int ignore_key) |
2034 | { |
2035 | struct se_session *se_sess = cmd->se_sess; |
2036 | struct se_device *dev = cmd->se_dev; |
2037 | struct se_dev_entry *se_deve; |
2038 | struct se_lun *se_lun = cmd->se_lun; |
2039 | struct se_portal_group *se_tpg; |
2040 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; |
2041 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
2042 | /* Used for APTPL metadata w/ UNREGISTER */ |
2043 | unsigned char *pr_aptpl_buf = NULL; |
2044 | unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; |
2045 | sense_reason_t ret = TCM_NO_SENSE; |
2046 | int pr_holder = 0, type; |
2047 | |
2048 | if (!se_sess || !se_lun) { |
2049 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
2050 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2051 | } |
2052 | se_tpg = se_sess->se_tpg; |
2053 | se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
2054 | |
2055 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { |
2056 | memset(&isid_buf[0], 0, PR_REG_ISID_LEN); |
2057 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], |
2058 | PR_REG_ISID_LEN); |
2059 | isid_ptr = &isid_buf[0]; |
2060 | } |
2061 | /* |
2062 | * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 |
2063 | */ |
2064 | pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); |
2065 | if (!pr_reg_e) { |
2066 | if (res_key) { |
2067 | pr_warn("SPC-3 PR: Reservation Key non-zero" |
2068 | " for SA REGISTER, returning CONFLICT\n"); |
2069 | return TCM_RESERVATION_CONFLICT; |
2070 | } |
2071 | /* |
2072 | * Do nothing but return GOOD status. |
2073 | */ |
2074 | if (!sa_res_key) |
2075 | return 0; |
2076 | |
2077 | if (!spec_i_pt) { |
2078 | /* |
2079 | * Perform the Service Action REGISTER on the Initiator |
2080 | * Port Endpoint that the PRO was received from on the |
2081 | * Logical Unit of the SCSI device server. |
2082 | */ |
2083 | if (core_scsi3_alloc_registration(cmd->se_dev, |
2084 | se_sess->se_node_acl, se_deve, isid_ptr, |
2085 | sa_res_key, all_tg_pt, aptpl, |
2086 | ignore_key, 0)) { |
2087 | pr_err("Unable to allocate" |
2088 | " struct t10_pr_registration\n"); |
2089 | return TCM_INVALID_PARAMETER_LIST; |
2090 | } |
2091 | } else { |
2092 | /* |
2093 | * Register both the Initiator port that received |
2094 | * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI |
2095 | * TransportID from Parameter list and loop through |
2096 | * fabric dependent parameter list while calling |
2097 | * logic from of core_scsi3_alloc_registration() for |
2098 | * each TransportID provided SCSI Initiator Port/Device |
2099 | */ |
2100 | ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, |
2101 | isid_ptr, sa_res_key, all_tg_pt, aptpl); |
2102 | if (ret != 0) |
2103 | return ret; |
2104 | } |
2105 | /* |
2106 | * Nothing left to do for the APTPL=0 case. |
2107 | */ |
2108 | if (!aptpl) { |
2109 | pr_tmpl->pr_aptpl_active = 0; |
2110 | core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); |
2111 | pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" |
2112 | " REGISTER\n"); |
2113 | return 0; |
2114 | } |
2115 | /* |
2116 | * Locate the newly allocated local I_T Nexus *pr_reg, and |
2117 | * update the APTPL metadata information using its |
2118 | * preallocated *pr_reg->pr_aptpl_buf. |
2119 | */ |
2120 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, |
2121 | se_sess->se_node_acl, se_sess); |
2122 | |
2123 | if (core_scsi3_update_and_write_aptpl(cmd->se_dev, |
2124 | &pr_reg->pr_aptpl_buf[0], |
2125 | pr_tmpl->pr_aptpl_buf_len)) { |
2126 | pr_tmpl->pr_aptpl_active = 1; |
2127 | pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); |
2128 | } |
2129 | |
2130 | goto out_put_pr_reg; |
2131 | } |
2132 | |
2133 | /* |
2134 | * Locate the existing *pr_reg via struct se_node_acl pointers |
2135 | */ |
2136 | pr_reg = pr_reg_e; |
2137 | type = pr_reg->pr_res_type; |
2138 | |
2139 | if (!ignore_key) { |
2140 | if (res_key != pr_reg->pr_res_key) { |
2141 | pr_err("SPC-3 PR REGISTER: Received" |
2142 | " res_key: 0x%016Lx does not match" |
2143 | " existing SA REGISTER res_key:" |
2144 | " 0x%016Lx\n", res_key, |
2145 | pr_reg->pr_res_key); |
2146 | ret = TCM_RESERVATION_CONFLICT; |
2147 | goto out_put_pr_reg; |
2148 | } |
2149 | } |
2150 | |
2151 | if (spec_i_pt) { |
2152 | pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" |
2153 | " set while sa_res_key=0\n"); |
2154 | ret = TCM_INVALID_PARAMETER_LIST; |
2155 | goto out_put_pr_reg; |
2156 | } |
2157 | |
2158 | /* |
2159 | * An existing ALL_TG_PT=1 registration being released |
2160 | * must also set ALL_TG_PT=1 in the incoming PROUT. |
2161 | */ |
2162 | if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { |
2163 | pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" |
2164 | " registration exists, but ALL_TG_PT=1 bit not" |
2165 | " present in received PROUT\n"); |
2166 | ret = TCM_INVALID_CDB_FIELD; |
2167 | goto out_put_pr_reg; |
2168 | } |
2169 | |
2170 | /* |
2171 | * Allocate APTPL metadata buffer used for UNREGISTER ops |
2172 | */ |
2173 | if (aptpl) { |
2174 | pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, |
2175 | GFP_KERNEL); |
2176 | if (!pr_aptpl_buf) { |
2177 | pr_err("Unable to allocate" |
2178 | " pr_aptpl_buf\n"); |
2179 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2180 | goto out_put_pr_reg; |
2181 | } |
2182 | } |
2183 | |
2184 | /* |
2185 | * sa_res_key=0 Unregister Reservation Key for registered I_T |
2186 | * Nexus sa_res_key=1 Change Reservation Key for registered I_T |
2187 | * Nexus. |
2188 | */ |
2189 | if (!sa_res_key) { |
2190 | pr_holder = core_scsi3_check_implict_release( |
2191 | cmd->se_dev, pr_reg); |
2192 | if (pr_holder < 0) { |
2193 | kfree(pr_aptpl_buf); |
2194 | ret = TCM_RESERVATION_CONFLICT; |
2195 | goto out_put_pr_reg; |
2196 | } |
2197 | |
2198 | spin_lock(&pr_tmpl->registration_lock); |
2199 | /* |
2200 | * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port |
2201 | * and matching pr_res_key. |
2202 | */ |
2203 | if (pr_reg->pr_reg_all_tg_pt) { |
2204 | list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, |
2205 | &pr_tmpl->registration_list, |
2206 | pr_reg_list) { |
2207 | |
2208 | if (!pr_reg_p->pr_reg_all_tg_pt) |
2209 | continue; |
2210 | if (pr_reg_p->pr_res_key != res_key) |
2211 | continue; |
2212 | if (pr_reg == pr_reg_p) |
2213 | continue; |
2214 | if (strcmp(pr_reg->pr_reg_nacl->initiatorname, |
2215 | pr_reg_p->pr_reg_nacl->initiatorname)) |
2216 | continue; |
2217 | |
2218 | __core_scsi3_free_registration(dev, |
2219 | pr_reg_p, NULL, 0); |
2220 | } |
2221 | } |
2222 | |
2223 | /* |
2224 | * Release the calling I_T Nexus registration now.. |
2225 | */ |
2226 | __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); |
2227 | |
2228 | /* |
2229 | * From spc4r17, section 5.7.11.3 Unregistering |
2230 | * |
2231 | * If the persistent reservation is a registrants only |
2232 | * type, the device server shall establish a unit |
2233 | * attention condition for the initiator port associated |
2234 | * with every registered I_T nexus except for the I_T |
2235 | * nexus on which the PERSISTENT RESERVE OUT command was |
2236 | * received, with the additional sense code set to |
2237 | * RESERVATIONS RELEASED. |
2238 | */ |
2239 | if (pr_holder && |
2240 | (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || |
2241 | type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { |
2242 | list_for_each_entry(pr_reg_p, |
2243 | &pr_tmpl->registration_list, |
2244 | pr_reg_list) { |
2245 | |
2246 | core_scsi3_ua_allocate( |
2247 | pr_reg_p->pr_reg_nacl, |
2248 | pr_reg_p->pr_res_mapped_lun, |
2249 | 0x2A, |
2250 | ASCQ_2AH_RESERVATIONS_RELEASED); |
2251 | } |
2252 | } |
2253 | spin_unlock(&pr_tmpl->registration_lock); |
2254 | |
2255 | if (!aptpl) { |
2256 | pr_tmpl->pr_aptpl_active = 0; |
2257 | core_scsi3_update_and_write_aptpl(dev, NULL, 0); |
2258 | pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" |
2259 | " for UNREGISTER\n"); |
2260 | return 0; |
2261 | } |
2262 | |
2263 | if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0], |
2264 | pr_tmpl->pr_aptpl_buf_len)) { |
2265 | pr_tmpl->pr_aptpl_active = 1; |
2266 | pr_debug("SPC-3 PR: Set APTPL Bit Activated" |
2267 | " for UNREGISTER\n"); |
2268 | } |
2269 | |
2270 | goto out_free_aptpl_buf; |
2271 | } |
2272 | |
2273 | /* |
2274 | * Increment PRgeneration counter for struct se_device" |
2275 | * upon a successful REGISTER, see spc4r17 section 6.3.2 |
2276 | * READ_KEYS service action. |
2277 | */ |
2278 | pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); |
2279 | pr_reg->pr_res_key = sa_res_key; |
2280 | pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" |
2281 | " Key for %s to: 0x%016Lx PRgeneration:" |
2282 | " 0x%08x\n", cmd->se_tfo->get_fabric_name(), |
2283 | (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", |
2284 | pr_reg->pr_reg_nacl->initiatorname, |
2285 | pr_reg->pr_res_key, pr_reg->pr_res_generation); |
2286 | |
2287 | if (!aptpl) { |
2288 | pr_tmpl->pr_aptpl_active = 0; |
2289 | core_scsi3_update_and_write_aptpl(dev, NULL, 0); |
2290 | pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" |
2291 | " for REGISTER\n"); |
2292 | ret = 0; |
2293 | goto out_put_pr_reg; |
2294 | } |
2295 | |
2296 | if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0], |
2297 | pr_tmpl->pr_aptpl_buf_len)) { |
2298 | pr_tmpl->pr_aptpl_active = 1; |
2299 | pr_debug("SPC-3 PR: Set APTPL Bit Activated" |
2300 | " for REGISTER\n"); |
2301 | } |
2302 | |
2303 | out_free_aptpl_buf: |
2304 | kfree(pr_aptpl_buf); |
2305 | ret = 0; |
2306 | out_put_pr_reg: |
2307 | core_scsi3_put_pr_reg(pr_reg); |
2308 | return ret; |
2309 | } |
2310 | |
2311 | unsigned char *core_scsi3_pr_dump_type(int type) |
2312 | { |
2313 | switch (type) { |
2314 | case PR_TYPE_WRITE_EXCLUSIVE: |
2315 | return "Write Exclusive Access"; |
2316 | case PR_TYPE_EXCLUSIVE_ACCESS: |
2317 | return "Exclusive Access"; |
2318 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
2319 | return "Write Exclusive Access, Registrants Only"; |
2320 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
2321 | return "Exclusive Access, Registrants Only"; |
2322 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
2323 | return "Write Exclusive Access, All Registrants"; |
2324 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
2325 | return "Exclusive Access, All Registrants"; |
2326 | default: |
2327 | break; |
2328 | } |
2329 | |
2330 | return "Unknown SPC-3 PR Type"; |
2331 | } |
2332 | |
2333 | static sense_reason_t |
2334 | core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) |
2335 | { |
2336 | struct se_device *dev = cmd->se_dev; |
2337 | struct se_session *se_sess = cmd->se_sess; |
2338 | struct se_lun *se_lun = cmd->se_lun; |
2339 | struct t10_pr_registration *pr_reg, *pr_res_holder; |
2340 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
2341 | char i_buf[PR_REG_ISID_ID_LEN]; |
2342 | sense_reason_t ret; |
2343 | int prf_isid; |
2344 | |
2345 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
2346 | |
2347 | if (!se_sess || !se_lun) { |
2348 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
2349 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2350 | } |
2351 | /* |
2352 | * Locate the existing *pr_reg via struct se_node_acl pointers |
2353 | */ |
2354 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
2355 | se_sess); |
2356 | if (!pr_reg) { |
2357 | pr_err("SPC-3 PR: Unable to locate" |
2358 | " PR_REGISTERED *pr_reg for RESERVE\n"); |
2359 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2360 | } |
2361 | /* |
2362 | * From spc4r17 Section 5.7.9: Reserving: |
2363 | * |
2364 | * An application client creates a persistent reservation by issuing |
2365 | * a PERSISTENT RESERVE OUT command with RESERVE service action through |
2366 | * a registered I_T nexus with the following parameters: |
2367 | * a) RESERVATION KEY set to the value of the reservation key that is |
2368 | * registered with the logical unit for the I_T nexus; and |
2369 | */ |
2370 | if (res_key != pr_reg->pr_res_key) { |
2371 | pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" |
2372 | " does not match existing SA REGISTER res_key:" |
2373 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
2374 | ret = TCM_RESERVATION_CONFLICT; |
2375 | goto out_put_pr_reg; |
2376 | } |
2377 | /* |
2378 | * From spc4r17 Section 5.7.9: Reserving: |
2379 | * |
2380 | * From above: |
2381 | * b) TYPE field and SCOPE field set to the persistent reservation |
2382 | * being created. |
2383 | * |
2384 | * Only one persistent reservation is allowed at a time per logical unit |
2385 | * and that persistent reservation has a scope of LU_SCOPE. |
2386 | */ |
2387 | if (scope != PR_SCOPE_LU_SCOPE) { |
2388 | pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); |
2389 | ret = TCM_INVALID_PARAMETER_LIST; |
2390 | goto out_put_pr_reg; |
2391 | } |
2392 | /* |
2393 | * See if we have an existing PR reservation holder pointer at |
2394 | * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration |
2395 | * *pr_res_holder. |
2396 | */ |
2397 | spin_lock(&dev->dev_reservation_lock); |
2398 | pr_res_holder = dev->dev_pr_res_holder; |
2399 | if (pr_res_holder) { |
2400 | /* |
2401 | * From spc4r17 Section 5.7.9: Reserving: |
2402 | * |
2403 | * If the device server receives a PERSISTENT RESERVE OUT |
2404 | * command from an I_T nexus other than a persistent reservation |
2405 | * holder (see 5.7.10) that attempts to create a persistent |
2406 | * reservation when a persistent reservation already exists for |
2407 | * the logical unit, then the command shall be completed with |
2408 | * RESERVATION CONFLICT status. |
2409 | */ |
2410 | if (pr_res_holder != pr_reg) { |
2411 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
2412 | pr_err("SPC-3 PR: Attempted RESERVE from" |
2413 | " [%s]: %s while reservation already held by" |
2414 | " [%s]: %s, returning RESERVATION_CONFLICT\n", |
2415 | cmd->se_tfo->get_fabric_name(), |
2416 | se_sess->se_node_acl->initiatorname, |
2417 | pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
2418 | pr_res_holder->pr_reg_nacl->initiatorname); |
2419 | |
2420 | spin_unlock(&dev->dev_reservation_lock); |
2421 | ret = TCM_RESERVATION_CONFLICT; |
2422 | goto out_put_pr_reg; |
2423 | } |
2424 | /* |
2425 | * From spc4r17 Section 5.7.9: Reserving: |
2426 | * |
2427 | * If a persistent reservation holder attempts to modify the |
2428 | * type or scope of an existing persistent reservation, the |
2429 | * command shall be completed with RESERVATION CONFLICT status. |
2430 | */ |
2431 | if ((pr_res_holder->pr_res_type != type) || |
2432 | (pr_res_holder->pr_res_scope != scope)) { |
2433 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
2434 | pr_err("SPC-3 PR: Attempted RESERVE from" |
2435 | " [%s]: %s trying to change TYPE and/or SCOPE," |
2436 | " while reservation already held by [%s]: %s," |
2437 | " returning RESERVATION_CONFLICT\n", |
2438 | cmd->se_tfo->get_fabric_name(), |
2439 | se_sess->se_node_acl->initiatorname, |
2440 | pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
2441 | pr_res_holder->pr_reg_nacl->initiatorname); |
2442 | |
2443 | spin_unlock(&dev->dev_reservation_lock); |
2444 | ret = TCM_RESERVATION_CONFLICT; |
2445 | goto out_put_pr_reg; |
2446 | } |
2447 | /* |
2448 | * From spc4r17 Section 5.7.9: Reserving: |
2449 | * |
2450 | * If the device server receives a PERSISTENT RESERVE OUT |
2451 | * command with RESERVE service action where the TYPE field and |
2452 | * the SCOPE field contain the same values as the existing type |
2453 | * and scope from a persistent reservation holder, it shall not |
2454 | * make any change to the existing persistent reservation and |
2455 | * shall completethe command with GOOD status. |
2456 | */ |
2457 | spin_unlock(&dev->dev_reservation_lock); |
2458 | ret = 0; |
2459 | goto out_put_pr_reg; |
2460 | } |
2461 | /* |
2462 | * Otherwise, our *pr_reg becomes the PR reservation holder for said |
2463 | * TYPE/SCOPE. Also set the received scope and type in *pr_reg. |
2464 | */ |
2465 | pr_reg->pr_res_scope = scope; |
2466 | pr_reg->pr_res_type = type; |
2467 | pr_reg->pr_res_holder = 1; |
2468 | dev->dev_pr_res_holder = pr_reg; |
2469 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
2470 | PR_REG_ISID_ID_LEN); |
2471 | |
2472 | pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" |
2473 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
2474 | cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), |
2475 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
2476 | pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", |
2477 | cmd->se_tfo->get_fabric_name(), |
2478 | se_sess->se_node_acl->initiatorname, |
2479 | (prf_isid) ? &i_buf[0] : ""); |
2480 | spin_unlock(&dev->dev_reservation_lock); |
2481 | |
2482 | if (pr_tmpl->pr_aptpl_active) { |
2483 | if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, |
2484 | &pr_reg->pr_aptpl_buf[0], |
2485 | pr_tmpl->pr_aptpl_buf_len)) { |
2486 | pr_debug("SPC-3 PR: Updated APTPL metadata" |
2487 | " for RESERVE\n"); |
2488 | } |
2489 | } |
2490 | |
2491 | ret = 0; |
2492 | out_put_pr_reg: |
2493 | core_scsi3_put_pr_reg(pr_reg); |
2494 | return ret; |
2495 | } |
2496 | |
2497 | static sense_reason_t |
2498 | core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, |
2499 | u64 res_key) |
2500 | { |
2501 | switch (type) { |
2502 | case PR_TYPE_WRITE_EXCLUSIVE: |
2503 | case PR_TYPE_EXCLUSIVE_ACCESS: |
2504 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
2505 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
2506 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
2507 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
2508 | return core_scsi3_pro_reserve(cmd, type, scope, res_key); |
2509 | default: |
2510 | pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" |
2511 | " 0x%02x\n", type); |
2512 | return TCM_INVALID_CDB_FIELD; |
2513 | } |
2514 | } |
2515 | |
2516 | /* |
2517 | * Called with struct se_device->dev_reservation_lock held. |
2518 | */ |
2519 | static void __core_scsi3_complete_pro_release( |
2520 | struct se_device *dev, |
2521 | struct se_node_acl *se_nacl, |
2522 | struct t10_pr_registration *pr_reg, |
2523 | int explict) |
2524 | { |
2525 | struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; |
2526 | char i_buf[PR_REG_ISID_ID_LEN]; |
2527 | int prf_isid; |
2528 | |
2529 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
2530 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
2531 | PR_REG_ISID_ID_LEN); |
2532 | /* |
2533 | * Go ahead and release the current PR reservation holder. |
2534 | */ |
2535 | dev->dev_pr_res_holder = NULL; |
2536 | |
2537 | pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" |
2538 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
2539 | tfo->get_fabric_name(), (explict) ? "explict" : "implict", |
2540 | core_scsi3_pr_dump_type(pr_reg->pr_res_type), |
2541 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
2542 | pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", |
2543 | tfo->get_fabric_name(), se_nacl->initiatorname, |
2544 | (prf_isid) ? &i_buf[0] : ""); |
2545 | /* |
2546 | * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE |
2547 | */ |
2548 | pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; |
2549 | } |
2550 | |
2551 | static sense_reason_t |
2552 | core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, |
2553 | u64 res_key) |
2554 | { |
2555 | struct se_device *dev = cmd->se_dev; |
2556 | struct se_session *se_sess = cmd->se_sess; |
2557 | struct se_lun *se_lun = cmd->se_lun; |
2558 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; |
2559 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
2560 | int all_reg = 0; |
2561 | sense_reason_t ret = 0; |
2562 | |
2563 | if (!se_sess || !se_lun) { |
2564 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
2565 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2566 | } |
2567 | /* |
2568 | * Locate the existing *pr_reg via struct se_node_acl pointers |
2569 | */ |
2570 | pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); |
2571 | if (!pr_reg) { |
2572 | pr_err("SPC-3 PR: Unable to locate" |
2573 | " PR_REGISTERED *pr_reg for RELEASE\n"); |
2574 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2575 | } |
2576 | /* |
2577 | * From spc4r17 Section 5.7.11.2 Releasing: |
2578 | * |
2579 | * If there is no persistent reservation or in response to a persistent |
2580 | * reservation release request from a registered I_T nexus that is not a |
2581 | * persistent reservation holder (see 5.7.10), the device server shall |
2582 | * do the following: |
2583 | * |
2584 | * a) Not release the persistent reservation, if any; |
2585 | * b) Not remove any registrations; and |
2586 | * c) Complete the command with GOOD status. |
2587 | */ |
2588 | spin_lock(&dev->dev_reservation_lock); |
2589 | pr_res_holder = dev->dev_pr_res_holder; |
2590 | if (!pr_res_holder) { |
2591 | /* |
2592 | * No persistent reservation, return GOOD status. |
2593 | */ |
2594 | spin_unlock(&dev->dev_reservation_lock); |
2595 | goto out_put_pr_reg; |
2596 | } |
2597 | if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
2598 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) |
2599 | all_reg = 1; |
2600 | |
2601 | if ((all_reg == 0) && (pr_res_holder != pr_reg)) { |
2602 | /* |
2603 | * Non 'All Registrants' PR Type cases.. |
2604 | * Release request from a registered I_T nexus that is not a |
2605 | * persistent reservation holder. return GOOD status. |
2606 | */ |
2607 | spin_unlock(&dev->dev_reservation_lock); |
2608 | goto out_put_pr_reg; |
2609 | } |
2610 | |
2611 | /* |
2612 | * From spc4r17 Section 5.7.11.2 Releasing: |
2613 | * |
2614 | * Only the persistent reservation holder (see 5.7.10) is allowed to |
2615 | * release a persistent reservation. |
2616 | * |
2617 | * An application client releases the persistent reservation by issuing |
2618 | * a PERSISTENT RESERVE OUT command with RELEASE service action through |
2619 | * an I_T nexus that is a persistent reservation holder with the |
2620 | * following parameters: |
2621 | * |
2622 | * a) RESERVATION KEY field set to the value of the reservation key |
2623 | * that is registered with the logical unit for the I_T nexus; |
2624 | */ |
2625 | if (res_key != pr_reg->pr_res_key) { |
2626 | pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" |
2627 | " does not match existing SA REGISTER res_key:" |
2628 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
2629 | spin_unlock(&dev->dev_reservation_lock); |
2630 | ret = TCM_RESERVATION_CONFLICT; |
2631 | goto out_put_pr_reg; |
2632 | } |
2633 | /* |
2634 | * From spc4r17 Section 5.7.11.2 Releasing and above: |
2635 | * |
2636 | * b) TYPE field and SCOPE field set to match the persistent |
2637 | * reservation being released. |
2638 | */ |
2639 | if ((pr_res_holder->pr_res_type != type) || |
2640 | (pr_res_holder->pr_res_scope != scope)) { |
2641 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
2642 | pr_err("SPC-3 PR RELEASE: Attempted to release" |
2643 | " reservation from [%s]: %s with different TYPE " |
2644 | "and/or SCOPE while reservation already held by" |
2645 | " [%s]: %s, returning RESERVATION_CONFLICT\n", |
2646 | cmd->se_tfo->get_fabric_name(), |
2647 | se_sess->se_node_acl->initiatorname, |
2648 | pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
2649 | pr_res_holder->pr_reg_nacl->initiatorname); |
2650 | |
2651 | spin_unlock(&dev->dev_reservation_lock); |
2652 | ret = TCM_RESERVATION_CONFLICT; |
2653 | goto out_put_pr_reg; |
2654 | } |
2655 | /* |
2656 | * In response to a persistent reservation release request from the |
2657 | * persistent reservation holder the device server shall perform a |
2658 | * release by doing the following as an uninterrupted series of actions: |
2659 | * a) Release the persistent reservation; |
2660 | * b) Not remove any registration(s); |
2661 | * c) If the released persistent reservation is a registrants only type |
2662 | * or all registrants type persistent reservation, |
2663 | * the device server shall establish a unit attention condition for |
2664 | * the initiator port associated with every regis- |
2665 | * tered I_T nexus other than I_T nexus on which the PERSISTENT |
2666 | * RESERVE OUT command with RELEASE service action was received, |
2667 | * with the additional sense code set to RESERVATIONS RELEASED; and |
2668 | * d) If the persistent reservation is of any other type, the device |
2669 | * server shall not establish a unit attention condition. |
2670 | */ |
2671 | __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, |
2672 | pr_reg, 1); |
2673 | |
2674 | spin_unlock(&dev->dev_reservation_lock); |
2675 | |
2676 | if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && |
2677 | (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && |
2678 | (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && |
2679 | (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
2680 | /* |
2681 | * If no UNIT ATTENTION conditions will be established for |
2682 | * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS |
2683 | * go ahead and check for APTPL=1 update+write below |
2684 | */ |
2685 | goto write_aptpl; |
2686 | } |
2687 | |
2688 | spin_lock(&pr_tmpl->registration_lock); |
2689 | list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, |
2690 | pr_reg_list) { |
2691 | /* |
2692 | * Do not establish a UNIT ATTENTION condition |
2693 | * for the calling I_T Nexus |
2694 | */ |
2695 | if (pr_reg_p == pr_reg) |
2696 | continue; |
2697 | |
2698 | core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, |
2699 | pr_reg_p->pr_res_mapped_lun, |
2700 | 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); |
2701 | } |
2702 | spin_unlock(&pr_tmpl->registration_lock); |
2703 | |
2704 | write_aptpl: |
2705 | if (pr_tmpl->pr_aptpl_active) { |
2706 | if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, |
2707 | &pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) { |
2708 | pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); |
2709 | } |
2710 | } |
2711 | out_put_pr_reg: |
2712 | core_scsi3_put_pr_reg(pr_reg); |
2713 | return ret; |
2714 | } |
2715 | |
2716 | static sense_reason_t |
2717 | core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) |
2718 | { |
2719 | struct se_device *dev = cmd->se_dev; |
2720 | struct se_node_acl *pr_reg_nacl; |
2721 | struct se_session *se_sess = cmd->se_sess; |
2722 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
2723 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; |
2724 | u32 pr_res_mapped_lun = 0; |
2725 | int calling_it_nexus = 0; |
2726 | /* |
2727 | * Locate the existing *pr_reg via struct se_node_acl pointers |
2728 | */ |
2729 | pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, |
2730 | se_sess->se_node_acl, se_sess); |
2731 | if (!pr_reg_n) { |
2732 | pr_err("SPC-3 PR: Unable to locate" |
2733 | " PR_REGISTERED *pr_reg for CLEAR\n"); |
2734 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2735 | } |
2736 | /* |
2737 | * From spc4r17 section 5.7.11.6, Clearing: |
2738 | * |
2739 | * Any application client may release the persistent reservation and |
2740 | * remove all registrations from a device server by issuing a |
2741 | * PERSISTENT RESERVE OUT command with CLEAR service action through a |
2742 | * registered I_T nexus with the following parameter: |
2743 | * |
2744 | * a) RESERVATION KEY field set to the value of the reservation key |
2745 | * that is registered with the logical unit for the I_T nexus. |
2746 | */ |
2747 | if (res_key != pr_reg_n->pr_res_key) { |
2748 | pr_err("SPC-3 PR REGISTER: Received" |
2749 | " res_key: 0x%016Lx does not match" |
2750 | " existing SA REGISTER res_key:" |
2751 | " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); |
2752 | core_scsi3_put_pr_reg(pr_reg_n); |
2753 | return TCM_RESERVATION_CONFLICT; |
2754 | } |
2755 | /* |
2756 | * a) Release the persistent reservation, if any; |
2757 | */ |
2758 | spin_lock(&dev->dev_reservation_lock); |
2759 | pr_res_holder = dev->dev_pr_res_holder; |
2760 | if (pr_res_holder) { |
2761 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
2762 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
2763 | pr_res_holder, 0); |
2764 | } |
2765 | spin_unlock(&dev->dev_reservation_lock); |
2766 | /* |
2767 | * b) Remove all registration(s) (see spc4r17 5.7.7); |
2768 | */ |
2769 | spin_lock(&pr_tmpl->registration_lock); |
2770 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
2771 | &pr_tmpl->registration_list, pr_reg_list) { |
2772 | |
2773 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
2774 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
2775 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
2776 | __core_scsi3_free_registration(dev, pr_reg, NULL, |
2777 | calling_it_nexus); |
2778 | /* |
2779 | * e) Establish a unit attention condition for the initiator |
2780 | * port associated with every registered I_T nexus other |
2781 | * than the I_T nexus on which the PERSISTENT RESERVE OUT |
2782 | * command with CLEAR service action was received, with the |
2783 | * additional sense code set to RESERVATIONS PREEMPTED. |
2784 | */ |
2785 | if (!calling_it_nexus) |
2786 | core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, |
2787 | 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); |
2788 | } |
2789 | spin_unlock(&pr_tmpl->registration_lock); |
2790 | |
2791 | pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", |
2792 | cmd->se_tfo->get_fabric_name()); |
2793 | |
2794 | if (pr_tmpl->pr_aptpl_active) { |
2795 | core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); |
2796 | pr_debug("SPC-3 PR: Updated APTPL metadata" |
2797 | " for CLEAR\n"); |
2798 | } |
2799 | |
2800 | core_scsi3_pr_generation(dev); |
2801 | return 0; |
2802 | } |
2803 | |
2804 | /* |
2805 | * Called with struct se_device->dev_reservation_lock held. |
2806 | */ |
2807 | static void __core_scsi3_complete_pro_preempt( |
2808 | struct se_device *dev, |
2809 | struct t10_pr_registration *pr_reg, |
2810 | struct list_head *preempt_and_abort_list, |
2811 | int type, |
2812 | int scope, |
2813 | int abort) |
2814 | { |
2815 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl; |
2816 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
2817 | char i_buf[PR_REG_ISID_ID_LEN]; |
2818 | int prf_isid; |
2819 | |
2820 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
2821 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
2822 | PR_REG_ISID_ID_LEN); |
2823 | /* |
2824 | * Do an implict RELEASE of the existing reservation. |
2825 | */ |
2826 | if (dev->dev_pr_res_holder) |
2827 | __core_scsi3_complete_pro_release(dev, nacl, |
2828 | dev->dev_pr_res_holder, 0); |
2829 | |
2830 | dev->dev_pr_res_holder = pr_reg; |
2831 | pr_reg->pr_res_holder = 1; |
2832 | pr_reg->pr_res_type = type; |
2833 | pr_reg->pr_res_scope = scope; |
2834 | |
2835 | pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" |
2836 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
2837 | tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", |
2838 | core_scsi3_pr_dump_type(type), |
2839 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
2840 | pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", |
2841 | tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", |
2842 | nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); |
2843 | /* |
2844 | * For PREEMPT_AND_ABORT, add the preempting reservation's |
2845 | * struct t10_pr_registration to the list that will be compared |
2846 | * against received CDBs.. |
2847 | */ |
2848 | if (preempt_and_abort_list) |
2849 | list_add_tail(&pr_reg->pr_reg_abort_list, |
2850 | preempt_and_abort_list); |
2851 | } |
2852 | |
2853 | static void core_scsi3_release_preempt_and_abort( |
2854 | struct list_head *preempt_and_abort_list, |
2855 | struct t10_pr_registration *pr_reg_holder) |
2856 | { |
2857 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
2858 | |
2859 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, |
2860 | pr_reg_abort_list) { |
2861 | |
2862 | list_del(&pr_reg->pr_reg_abort_list); |
2863 | if (pr_reg_holder == pr_reg) |
2864 | continue; |
2865 | if (pr_reg->pr_res_holder) { |
2866 | pr_warn("pr_reg->pr_res_holder still set\n"); |
2867 | continue; |
2868 | } |
2869 | |
2870 | pr_reg->pr_reg_deve = NULL; |
2871 | pr_reg->pr_reg_nacl = NULL; |
2872 | kfree(pr_reg->pr_aptpl_buf); |
2873 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
2874 | } |
2875 | } |
2876 | |
2877 | static sense_reason_t |
2878 | core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, |
2879 | u64 sa_res_key, int abort) |
2880 | { |
2881 | struct se_device *dev = cmd->se_dev; |
2882 | struct se_node_acl *pr_reg_nacl; |
2883 | struct se_session *se_sess = cmd->se_sess; |
2884 | LIST_HEAD(preempt_and_abort_list); |
2885 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; |
2886 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
2887 | u32 pr_res_mapped_lun = 0; |
2888 | int all_reg = 0, calling_it_nexus = 0, released_regs = 0; |
2889 | int prh_type = 0, prh_scope = 0; |
2890 | |
2891 | if (!se_sess) |
2892 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
2893 | |
2894 | pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
2895 | se_sess); |
2896 | if (!pr_reg_n) { |
2897 | pr_err("SPC-3 PR: Unable to locate" |
2898 | " PR_REGISTERED *pr_reg for PREEMPT%s\n", |
2899 | (abort) ? "_AND_ABORT" : ""); |
2900 | return TCM_RESERVATION_CONFLICT; |
2901 | } |
2902 | if (pr_reg_n->pr_res_key != res_key) { |
2903 | core_scsi3_put_pr_reg(pr_reg_n); |
2904 | return TCM_RESERVATION_CONFLICT; |
2905 | } |
2906 | if (scope != PR_SCOPE_LU_SCOPE) { |
2907 | pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); |
2908 | core_scsi3_put_pr_reg(pr_reg_n); |
2909 | return TCM_INVALID_PARAMETER_LIST; |
2910 | } |
2911 | |
2912 | spin_lock(&dev->dev_reservation_lock); |
2913 | pr_res_holder = dev->dev_pr_res_holder; |
2914 | if (pr_res_holder && |
2915 | ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
2916 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) |
2917 | all_reg = 1; |
2918 | |
2919 | if (!all_reg && !sa_res_key) { |
2920 | spin_unlock(&dev->dev_reservation_lock); |
2921 | core_scsi3_put_pr_reg(pr_reg_n); |
2922 | return TCM_INVALID_PARAMETER_LIST; |
2923 | } |
2924 | /* |
2925 | * From spc4r17, section 5.7.11.4.4 Removing Registrations: |
2926 | * |
2927 | * If the SERVICE ACTION RESERVATION KEY field does not identify a |
2928 | * persistent reservation holder or there is no persistent reservation |
2929 | * holder (i.e., there is no persistent reservation), then the device |
2930 | * server shall perform a preempt by doing the following in an |
2931 | * uninterrupted series of actions. (See below..) |
2932 | */ |
2933 | if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { |
2934 | /* |
2935 | * No existing or SA Reservation Key matching reservations.. |
2936 | * |
2937 | * PROUT SA PREEMPT with All Registrant type reservations are |
2938 | * allowed to be processed without a matching SA Reservation Key |
2939 | */ |
2940 | spin_lock(&pr_tmpl->registration_lock); |
2941 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
2942 | &pr_tmpl->registration_list, pr_reg_list) { |
2943 | /* |
2944 | * Removing of registrations in non all registrants |
2945 | * type reservations without a matching SA reservation |
2946 | * key. |
2947 | * |
2948 | * a) Remove the registrations for all I_T nexuses |
2949 | * specified by the SERVICE ACTION RESERVATION KEY |
2950 | * field; |
2951 | * b) Ignore the contents of the SCOPE and TYPE fields; |
2952 | * c) Process tasks as defined in 5.7.1; and |
2953 | * d) Establish a unit attention condition for the |
2954 | * initiator port associated with every I_T nexus |
2955 | * that lost its registration other than the I_T |
2956 | * nexus on which the PERSISTENT RESERVE OUT command |
2957 | * was received, with the additional sense code set |
2958 | * to REGISTRATIONS PREEMPTED. |
2959 | */ |
2960 | if (!all_reg) { |
2961 | if (pr_reg->pr_res_key != sa_res_key) |
2962 | continue; |
2963 | |
2964 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
2965 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
2966 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
2967 | __core_scsi3_free_registration(dev, pr_reg, |
2968 | (abort) ? &preempt_and_abort_list : |
2969 | NULL, calling_it_nexus); |
2970 | released_regs++; |
2971 | } else { |
2972 | /* |
2973 | * Case for any existing all registrants type |
2974 | * reservation, follow logic in spc4r17 section |
2975 | * 5.7.11.4 Preempting, Table 52 and Figure 7. |
2976 | * |
2977 | * For a ZERO SA Reservation key, release |
2978 | * all other registrations and do an implict |
2979 | * release of active persistent reservation. |
2980 | * |
2981 | * For a non-ZERO SA Reservation key, only |
2982 | * release the matching reservation key from |
2983 | * registrations. |
2984 | */ |
2985 | if ((sa_res_key) && |
2986 | (pr_reg->pr_res_key != sa_res_key)) |
2987 | continue; |
2988 | |
2989 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
2990 | if (calling_it_nexus) |
2991 | continue; |
2992 | |
2993 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
2994 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
2995 | __core_scsi3_free_registration(dev, pr_reg, |
2996 | (abort) ? &preempt_and_abort_list : |
2997 | NULL, 0); |
2998 | released_regs++; |
2999 | } |
3000 | if (!calling_it_nexus) |
3001 | core_scsi3_ua_allocate(pr_reg_nacl, |
3002 | pr_res_mapped_lun, 0x2A, |
3003 | ASCQ_2AH_REGISTRATIONS_PREEMPTED); |
3004 | } |
3005 | spin_unlock(&pr_tmpl->registration_lock); |
3006 | /* |
3007 | * If a PERSISTENT RESERVE OUT with a PREEMPT service action or |
3008 | * a PREEMPT AND ABORT service action sets the SERVICE ACTION |
3009 | * RESERVATION KEY field to a value that does not match any |
3010 | * registered reservation key, then the device server shall |
3011 | * complete the command with RESERVATION CONFLICT status. |
3012 | */ |
3013 | if (!released_regs) { |
3014 | spin_unlock(&dev->dev_reservation_lock); |
3015 | core_scsi3_put_pr_reg(pr_reg_n); |
3016 | return TCM_RESERVATION_CONFLICT; |
3017 | } |
3018 | /* |
3019 | * For an existing all registrants type reservation |
3020 | * with a zero SA rservation key, preempt the existing |
3021 | * reservation with the new PR type and scope. |
3022 | */ |
3023 | if (pr_res_holder && all_reg && !(sa_res_key)) { |
3024 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n, |
3025 | (abort) ? &preempt_and_abort_list : NULL, |
3026 | type, scope, abort); |
3027 | |
3028 | if (abort) |
3029 | core_scsi3_release_preempt_and_abort( |
3030 | &preempt_and_abort_list, pr_reg_n); |
3031 | } |
3032 | spin_unlock(&dev->dev_reservation_lock); |
3033 | |
3034 | if (pr_tmpl->pr_aptpl_active) { |
3035 | if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, |
3036 | &pr_reg_n->pr_aptpl_buf[0], |
3037 | pr_tmpl->pr_aptpl_buf_len)) { |
3038 | pr_debug("SPC-3 PR: Updated APTPL" |
3039 | " metadata for PREEMPT%s\n", (abort) ? |
3040 | "_AND_ABORT" : ""); |
3041 | } |
3042 | } |
3043 | |
3044 | core_scsi3_put_pr_reg(pr_reg_n); |
3045 | core_scsi3_pr_generation(cmd->se_dev); |
3046 | return 0; |
3047 | } |
3048 | /* |
3049 | * The PREEMPTing SA reservation key matches that of the |
3050 | * existing persistent reservation, first, we check if |
3051 | * we are preempting our own reservation. |
3052 | * From spc4r17, section 5.7.11.4.3 Preempting |
3053 | * persistent reservations and registration handling |
3054 | * |
3055 | * If an all registrants persistent reservation is not |
3056 | * present, it is not an error for the persistent |
3057 | * reservation holder to preempt itself (i.e., a |
3058 | * PERSISTENT RESERVE OUT with a PREEMPT service action |
3059 | * or a PREEMPT AND ABORT service action with the |
3060 | * SERVICE ACTION RESERVATION KEY value equal to the |
3061 | * persistent reservation holder's reservation key that |
3062 | * is received from the persistent reservation holder). |
3063 | * In that case, the device server shall establish the |
3064 | * new persistent reservation and maintain the |
3065 | * registration. |
3066 | */ |
3067 | prh_type = pr_res_holder->pr_res_type; |
3068 | prh_scope = pr_res_holder->pr_res_scope; |
3069 | /* |
3070 | * If the SERVICE ACTION RESERVATION KEY field identifies a |
3071 | * persistent reservation holder (see 5.7.10), the device |
3072 | * server shall perform a preempt by doing the following as |
3073 | * an uninterrupted series of actions: |
3074 | * |
3075 | * a) Release the persistent reservation for the holder |
3076 | * identified by the SERVICE ACTION RESERVATION KEY field; |
3077 | */ |
3078 | if (pr_reg_n != pr_res_holder) |
3079 | __core_scsi3_complete_pro_release(dev, |
3080 | pr_res_holder->pr_reg_nacl, |
3081 | dev->dev_pr_res_holder, 0); |
3082 | /* |
3083 | * b) Remove the registrations for all I_T nexuses identified |
3084 | * by the SERVICE ACTION RESERVATION KEY field, except the |
3085 | * I_T nexus that is being used for the PERSISTENT RESERVE |
3086 | * OUT command. If an all registrants persistent reservation |
3087 | * is present and the SERVICE ACTION RESERVATION KEY field |
3088 | * is set to zero, then all registrations shall be removed |
3089 | * except for that of the I_T nexus that is being used for |
3090 | * the PERSISTENT RESERVE OUT command; |
3091 | */ |
3092 | spin_lock(&pr_tmpl->registration_lock); |
3093 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
3094 | &pr_tmpl->registration_list, pr_reg_list) { |
3095 | |
3096 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
3097 | if (calling_it_nexus) |
3098 | continue; |
3099 | |
3100 | if (pr_reg->pr_res_key != sa_res_key) |
3101 | continue; |
3102 | |
3103 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
3104 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
3105 | __core_scsi3_free_registration(dev, pr_reg, |
3106 | (abort) ? &preempt_and_abort_list : NULL, |
3107 | calling_it_nexus); |
3108 | /* |
3109 | * e) Establish a unit attention condition for the initiator |
3110 | * port associated with every I_T nexus that lost its |
3111 | * persistent reservation and/or registration, with the |
3112 | * additional sense code set to REGISTRATIONS PREEMPTED; |
3113 | */ |
3114 | core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, |
3115 | ASCQ_2AH_REGISTRATIONS_PREEMPTED); |
3116 | } |
3117 | spin_unlock(&pr_tmpl->registration_lock); |
3118 | /* |
3119 | * c) Establish a persistent reservation for the preempting |
3120 | * I_T nexus using the contents of the SCOPE and TYPE fields; |
3121 | */ |
3122 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n, |
3123 | (abort) ? &preempt_and_abort_list : NULL, |
3124 | type, scope, abort); |
3125 | /* |
3126 | * d) Process tasks as defined in 5.7.1; |
3127 | * e) See above.. |
3128 | * f) If the type or scope has changed, then for every I_T nexus |
3129 | * whose reservation key was not removed, except for the I_T |
3130 | * nexus on which the PERSISTENT RESERVE OUT command was |
3131 | * received, the device server shall establish a unit |
3132 | * attention condition for the initiator port associated with |
3133 | * that I_T nexus, with the additional sense code set to |
3134 | * RESERVATIONS RELEASED. If the type or scope have not |
3135 | * changed, then no unit attention condition(s) shall be |
3136 | * established for this reason. |
3137 | */ |
3138 | if ((prh_type != type) || (prh_scope != scope)) { |
3139 | spin_lock(&pr_tmpl->registration_lock); |
3140 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
3141 | &pr_tmpl->registration_list, pr_reg_list) { |
3142 | |
3143 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
3144 | if (calling_it_nexus) |
3145 | continue; |
3146 | |
3147 | core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, |
3148 | pr_reg->pr_res_mapped_lun, 0x2A, |
3149 | ASCQ_2AH_RESERVATIONS_RELEASED); |
3150 | } |
3151 | spin_unlock(&pr_tmpl->registration_lock); |
3152 | } |
3153 | spin_unlock(&dev->dev_reservation_lock); |
3154 | /* |
3155 | * Call LUN_RESET logic upon list of struct t10_pr_registration, |
3156 | * All received CDBs for the matching existing reservation and |
3157 | * registrations undergo ABORT_TASK logic. |
3158 | * |
3159 | * From there, core_scsi3_release_preempt_and_abort() will |
3160 | * release every registration in the list (which have already |
3161 | * been removed from the primary pr_reg list), except the |
3162 | * new persistent reservation holder, the calling Initiator Port. |
3163 | */ |
3164 | if (abort) { |
3165 | core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); |
3166 | core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, |
3167 | pr_reg_n); |
3168 | } |
3169 | |
3170 | if (pr_tmpl->pr_aptpl_active) { |
3171 | if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, |
3172 | &pr_reg_n->pr_aptpl_buf[0], |
3173 | pr_tmpl->pr_aptpl_buf_len)) { |
3174 | pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" |
3175 | "%s\n", abort ? "_AND_ABORT" : ""); |
3176 | } |
3177 | } |
3178 | |
3179 | core_scsi3_put_pr_reg(pr_reg_n); |
3180 | core_scsi3_pr_generation(cmd->se_dev); |
3181 | return 0; |
3182 | } |
3183 | |
3184 | static sense_reason_t |
3185 | core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, |
3186 | u64 res_key, u64 sa_res_key, int abort) |
3187 | { |
3188 | switch (type) { |
3189 | case PR_TYPE_WRITE_EXCLUSIVE: |
3190 | case PR_TYPE_EXCLUSIVE_ACCESS: |
3191 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
3192 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
3193 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
3194 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
3195 | return core_scsi3_pro_preempt(cmd, type, scope, res_key, |
3196 | sa_res_key, abort); |
3197 | default: |
3198 | pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" |
3199 | " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); |
3200 | return TCM_INVALID_CDB_FIELD; |
3201 | } |
3202 | } |
3203 | |
3204 | |
3205 | static sense_reason_t |
3206 | core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, |
3207 | u64 sa_res_key, int aptpl, int unreg) |
3208 | { |
3209 | struct se_session *se_sess = cmd->se_sess; |
3210 | struct se_device *dev = cmd->se_dev; |
3211 | struct se_dev_entry *dest_se_deve = NULL; |
3212 | struct se_lun *se_lun = cmd->se_lun; |
3213 | struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; |
3214 | struct se_port *se_port; |
3215 | struct se_portal_group *se_tpg, *dest_se_tpg = NULL; |
3216 | struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; |
3217 | struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; |
3218 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
3219 | unsigned char *buf; |
3220 | unsigned char *initiator_str; |
3221 | char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; |
3222 | u32 tid_len, tmp_tid_len; |
3223 | int new_reg = 0, type, scope, matching_iname, prf_isid; |
3224 | sense_reason_t ret; |
3225 | unsigned short rtpi; |
3226 | unsigned char proto_ident; |
3227 | |
3228 | if (!se_sess || !se_lun) { |
3229 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
3230 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3231 | } |
3232 | |
3233 | memset(dest_iport, 0, 64); |
3234 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
3235 | se_tpg = se_sess->se_tpg; |
3236 | tf_ops = se_tpg->se_tpg_tfo; |
3237 | /* |
3238 | * Follow logic from spc4r17 Section 5.7.8, Table 50 -- |
3239 | * Register behaviors for a REGISTER AND MOVE service action |
3240 | * |
3241 | * Locate the existing *pr_reg via struct se_node_acl pointers |
3242 | */ |
3243 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
3244 | se_sess); |
3245 | if (!pr_reg) { |
3246 | pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" |
3247 | " *pr_reg for REGISTER_AND_MOVE\n"); |
3248 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3249 | } |
3250 | /* |
3251 | * The provided reservation key much match the existing reservation key |
3252 | * provided during this initiator's I_T nexus registration. |
3253 | */ |
3254 | if (res_key != pr_reg->pr_res_key) { |
3255 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" |
3256 | " res_key: 0x%016Lx does not match existing SA REGISTER" |
3257 | " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
3258 | ret = TCM_RESERVATION_CONFLICT; |
3259 | goto out_put_pr_reg; |
3260 | } |
3261 | /* |
3262 | * The service active reservation key needs to be non zero |
3263 | */ |
3264 | if (!sa_res_key) { |
3265 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" |
3266 | " sa_res_key\n"); |
3267 | ret = TCM_INVALID_PARAMETER_LIST; |
3268 | goto out_put_pr_reg; |
3269 | } |
3270 | |
3271 | /* |
3272 | * Determine the Relative Target Port Identifier where the reservation |
3273 | * will be moved to for the TransportID containing SCSI initiator WWN |
3274 | * information. |
3275 | */ |
3276 | buf = transport_kmap_data_sg(cmd); |
3277 | if (!buf) { |
3278 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3279 | goto out_put_pr_reg; |
3280 | } |
3281 | |
3282 | rtpi = (buf[18] & 0xff) << 8; |
3283 | rtpi |= buf[19] & 0xff; |
3284 | tid_len = (buf[20] & 0xff) << 24; |
3285 | tid_len |= (buf[21] & 0xff) << 16; |
3286 | tid_len |= (buf[22] & 0xff) << 8; |
3287 | tid_len |= buf[23] & 0xff; |
3288 | transport_kunmap_data_sg(cmd); |
3289 | buf = NULL; |
3290 | |
3291 | if ((tid_len + 24) != cmd->data_length) { |
3292 | pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" |
3293 | " does not equal CDB data_length: %u\n", tid_len, |
3294 | cmd->data_length); |
3295 | ret = TCM_INVALID_PARAMETER_LIST; |
3296 | goto out_put_pr_reg; |
3297 | } |
3298 | |
3299 | spin_lock(&dev->se_port_lock); |
3300 | list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { |
3301 | if (se_port->sep_rtpi != rtpi) |
3302 | continue; |
3303 | dest_se_tpg = se_port->sep_tpg; |
3304 | if (!dest_se_tpg) |
3305 | continue; |
3306 | dest_tf_ops = dest_se_tpg->se_tpg_tfo; |
3307 | if (!dest_tf_ops) |
3308 | continue; |
3309 | |
3310 | atomic_inc(&dest_se_tpg->tpg_pr_ref_count); |
3311 | smp_mb__after_atomic_inc(); |
3312 | spin_unlock(&dev->se_port_lock); |
3313 | |
3314 | if (core_scsi3_tpg_depend_item(dest_se_tpg)) { |
3315 | pr_err("core_scsi3_tpg_depend_item() failed" |
3316 | " for dest_se_tpg\n"); |
3317 | atomic_dec(&dest_se_tpg->tpg_pr_ref_count); |
3318 | smp_mb__after_atomic_dec(); |
3319 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3320 | goto out_put_pr_reg; |
3321 | } |
3322 | |
3323 | spin_lock(&dev->se_port_lock); |
3324 | break; |
3325 | } |
3326 | spin_unlock(&dev->se_port_lock); |
3327 | |
3328 | if (!dest_se_tpg || !dest_tf_ops) { |
3329 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" |
3330 | " fabric ops from Relative Target Port Identifier:" |
3331 | " %hu\n", rtpi); |
3332 | ret = TCM_INVALID_PARAMETER_LIST; |
3333 | goto out_put_pr_reg; |
3334 | } |
3335 | |
3336 | buf = transport_kmap_data_sg(cmd); |
3337 | if (!buf) { |
3338 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3339 | goto out_put_pr_reg; |
3340 | } |
3341 | proto_ident = (buf[24] & 0x0f); |
3342 | |
3343 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" |
3344 | " 0x%02x\n", proto_ident); |
3345 | |
3346 | if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { |
3347 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" |
3348 | " proto_ident: 0x%02x does not match ident: 0x%02x" |
3349 | " from fabric: %s\n", proto_ident, |
3350 | dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), |
3351 | dest_tf_ops->get_fabric_name()); |
3352 | ret = TCM_INVALID_PARAMETER_LIST; |
3353 | goto out; |
3354 | } |
3355 | if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { |
3356 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" |
3357 | " containg a valid tpg_parse_pr_out_transport_id" |
3358 | " function pointer\n"); |
3359 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3360 | goto out; |
3361 | } |
3362 | initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, |
3363 | (const char *)&buf[24], &tmp_tid_len, &iport_ptr); |
3364 | if (!initiator_str) { |
3365 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" |
3366 | " initiator_str from Transport ID\n"); |
3367 | ret = TCM_INVALID_PARAMETER_LIST; |
3368 | goto out; |
3369 | } |
3370 | |
3371 | transport_kunmap_data_sg(cmd); |
3372 | buf = NULL; |
3373 | |
3374 | pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" |
3375 | " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? |
3376 | "port" : "device", initiator_str, (iport_ptr != NULL) ? |
3377 | iport_ptr : ""); |
3378 | /* |
3379 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service |
3380 | * action specifies a TransportID that is the same as the initiator port |
3381 | * of the I_T nexus for the command received, then the command shall |
3382 | * be terminated with CHECK CONDITION status, with the sense key set to |
3383 | * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD |
3384 | * IN PARAMETER LIST. |
3385 | */ |
3386 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
3387 | matching_iname = (!strcmp(initiator_str, |
3388 | pr_reg_nacl->initiatorname)) ? 1 : 0; |
3389 | if (!matching_iname) |
3390 | goto after_iport_check; |
3391 | |
3392 | if (!iport_ptr || !pr_reg->isid_present_at_reg) { |
3393 | pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" |
3394 | " matches: %s on received I_T Nexus\n", initiator_str, |
3395 | pr_reg_nacl->initiatorname); |
3396 | ret = TCM_INVALID_PARAMETER_LIST; |
3397 | goto out; |
3398 | } |
3399 | if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { |
3400 | pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" |
3401 | " matches: %s %s on received I_T Nexus\n", |
3402 | initiator_str, iport_ptr, pr_reg_nacl->initiatorname, |
3403 | pr_reg->pr_reg_isid); |
3404 | ret = TCM_INVALID_PARAMETER_LIST; |
3405 | goto out; |
3406 | } |
3407 | after_iport_check: |
3408 | /* |
3409 | * Locate the destination struct se_node_acl from the received Transport ID |
3410 | */ |
3411 | spin_lock_irq(&dest_se_tpg->acl_node_lock); |
3412 | dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, |
3413 | initiator_str); |
3414 | if (dest_node_acl) { |
3415 | atomic_inc(&dest_node_acl->acl_pr_ref_count); |
3416 | smp_mb__after_atomic_inc(); |
3417 | } |
3418 | spin_unlock_irq(&dest_se_tpg->acl_node_lock); |
3419 | |
3420 | if (!dest_node_acl) { |
3421 | pr_err("Unable to locate %s dest_node_acl for" |
3422 | " TransportID%s\n", dest_tf_ops->get_fabric_name(), |
3423 | initiator_str); |
3424 | ret = TCM_INVALID_PARAMETER_LIST; |
3425 | goto out; |
3426 | } |
3427 | |
3428 | if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { |
3429 | pr_err("core_scsi3_nodeacl_depend_item() for" |
3430 | " dest_node_acl\n"); |
3431 | atomic_dec(&dest_node_acl->acl_pr_ref_count); |
3432 | smp_mb__after_atomic_dec(); |
3433 | dest_node_acl = NULL; |
3434 | ret = TCM_INVALID_PARAMETER_LIST; |
3435 | goto out; |
3436 | } |
3437 | |
3438 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" |
3439 | " %s from TransportID\n", dest_tf_ops->get_fabric_name(), |
3440 | dest_node_acl->initiatorname); |
3441 | |
3442 | /* |
3443 | * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET |
3444 | * PORT IDENTIFIER. |
3445 | */ |
3446 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); |
3447 | if (!dest_se_deve) { |
3448 | pr_err("Unable to locate %s dest_se_deve from RTPI:" |
3449 | " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); |
3450 | ret = TCM_INVALID_PARAMETER_LIST; |
3451 | goto out; |
3452 | } |
3453 | |
3454 | if (core_scsi3_lunacl_depend_item(dest_se_deve)) { |
3455 | pr_err("core_scsi3_lunacl_depend_item() failed\n"); |
3456 | atomic_dec(&dest_se_deve->pr_ref_count); |
3457 | smp_mb__after_atomic_dec(); |
3458 | dest_se_deve = NULL; |
3459 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3460 | goto out; |
3461 | } |
3462 | |
3463 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" |
3464 | " ACL for dest_se_deve->mapped_lun: %u\n", |
3465 | dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, |
3466 | dest_se_deve->mapped_lun); |
3467 | |
3468 | /* |
3469 | * A persistent reservation needs to already existing in order to |
3470 | * successfully complete the REGISTER_AND_MOVE service action.. |
3471 | */ |
3472 | spin_lock(&dev->dev_reservation_lock); |
3473 | pr_res_holder = dev->dev_pr_res_holder; |
3474 | if (!pr_res_holder) { |
3475 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" |
3476 | " currently held\n"); |
3477 | spin_unlock(&dev->dev_reservation_lock); |
3478 | ret = TCM_INVALID_CDB_FIELD; |
3479 | goto out; |
3480 | } |
3481 | /* |
3482 | * The received on I_T Nexus must be the reservation holder. |
3483 | * |
3484 | * From spc4r17 section 5.7.8 Table 50 -- |
3485 | * Register behaviors for a REGISTER AND MOVE service action |
3486 | */ |
3487 | if (pr_res_holder != pr_reg) { |
3488 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" |
3489 | " Nexus is not reservation holder\n"); |
3490 | spin_unlock(&dev->dev_reservation_lock); |
3491 | ret = TCM_RESERVATION_CONFLICT; |
3492 | goto out; |
3493 | } |
3494 | /* |
3495 | * From spc4r17 section 5.7.8: registering and moving reservation |
3496 | * |
3497 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service |
3498 | * action is received and the established persistent reservation is a |
3499 | * Write Exclusive - All Registrants type or Exclusive Access - |
3500 | * All Registrants type reservation, then the command shall be completed |
3501 | * with RESERVATION CONFLICT status. |
3502 | */ |
3503 | if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
3504 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
3505 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" |
3506 | " reservation for type: %s\n", |
3507 | core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); |
3508 | spin_unlock(&dev->dev_reservation_lock); |
3509 | ret = TCM_RESERVATION_CONFLICT; |
3510 | goto out; |
3511 | } |
3512 | pr_res_nacl = pr_res_holder->pr_reg_nacl; |
3513 | /* |
3514 | * b) Ignore the contents of the (received) SCOPE and TYPE fields; |
3515 | */ |
3516 | type = pr_res_holder->pr_res_type; |
3517 | scope = pr_res_holder->pr_res_type; |
3518 | /* |
3519 | * c) Associate the reservation key specified in the SERVICE ACTION |
3520 | * RESERVATION KEY field with the I_T nexus specified as the |
3521 | * destination of the register and move, where: |
3522 | * A) The I_T nexus is specified by the TransportID and the |
3523 | * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and |
3524 | * B) Regardless of the TransportID format used, the association for |
3525 | * the initiator port is based on either the initiator port name |
3526 | * (see 3.1.71) on SCSI transport protocols where port names are |
3527 | * required or the initiator port identifier (see 3.1.70) on SCSI |
3528 | * transport protocols where port names are not required; |
3529 | * d) Register the reservation key specified in the SERVICE ACTION |
3530 | * RESERVATION KEY field; |
3531 | * e) Retain the reservation key specified in the SERVICE ACTION |
3532 | * RESERVATION KEY field and associated information; |
3533 | * |
3534 | * Also, It is not an error for a REGISTER AND MOVE service action to |
3535 | * register an I_T nexus that is already registered with the same |
3536 | * reservation key or a different reservation key. |
3537 | */ |
3538 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
3539 | iport_ptr); |
3540 | if (!dest_pr_reg) { |
3541 | if (core_scsi3_alloc_registration(cmd->se_dev, |
3542 | dest_node_acl, dest_se_deve, iport_ptr, |
3543 | sa_res_key, 0, aptpl, 2, 1)) { |
3544 | spin_unlock(&dev->dev_reservation_lock); |
3545 | ret = TCM_INVALID_PARAMETER_LIST; |
3546 | goto out; |
3547 | } |
3548 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
3549 | iport_ptr); |
3550 | new_reg = 1; |
3551 | } |
3552 | /* |
3553 | * f) Release the persistent reservation for the persistent reservation |
3554 | * holder (i.e., the I_T nexus on which the |
3555 | */ |
3556 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
3557 | dev->dev_pr_res_holder, 0); |
3558 | /* |
3559 | * g) Move the persistent reservation to the specified I_T nexus using |
3560 | * the same scope and type as the persistent reservation released in |
3561 | * item f); and |
3562 | */ |
3563 | dev->dev_pr_res_holder = dest_pr_reg; |
3564 | dest_pr_reg->pr_res_holder = 1; |
3565 | dest_pr_reg->pr_res_type = type; |
3566 | pr_reg->pr_res_scope = scope; |
3567 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
3568 | PR_REG_ISID_ID_LEN); |
3569 | /* |
3570 | * Increment PRGeneration for existing registrations.. |
3571 | */ |
3572 | if (!new_reg) |
3573 | dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; |
3574 | spin_unlock(&dev->dev_reservation_lock); |
3575 | |
3576 | pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" |
3577 | " created new reservation holder TYPE: %s on object RTPI:" |
3578 | " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), |
3579 | core_scsi3_pr_dump_type(type), rtpi, |
3580 | dest_pr_reg->pr_res_generation); |
3581 | pr_debug("SPC-3 PR Successfully moved reservation from" |
3582 | " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", |
3583 | tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, |
3584 | (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), |
3585 | dest_node_acl->initiatorname, (iport_ptr != NULL) ? |
3586 | iport_ptr : ""); |
3587 | /* |
3588 | * It is now safe to release configfs group dependencies for destination |
3589 | * of Transport ID Initiator Device/Port Identifier |
3590 | */ |
3591 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
3592 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
3593 | core_scsi3_tpg_undepend_item(dest_se_tpg); |
3594 | /* |
3595 | * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T |
3596 | * nexus on which PERSISTENT RESERVE OUT command was received. |
3597 | */ |
3598 | if (unreg) { |
3599 | spin_lock(&pr_tmpl->registration_lock); |
3600 | __core_scsi3_free_registration(dev, pr_reg, NULL, 1); |
3601 | spin_unlock(&pr_tmpl->registration_lock); |
3602 | } else |
3603 | core_scsi3_put_pr_reg(pr_reg); |
3604 | |
3605 | /* |
3606 | * Clear the APTPL metadata if APTPL has been disabled, otherwise |
3607 | * write out the updated metadata to struct file for this SCSI device. |
3608 | */ |
3609 | if (!aptpl) { |
3610 | pr_tmpl->pr_aptpl_active = 0; |
3611 | core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); |
3612 | pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" |
3613 | " REGISTER_AND_MOVE\n"); |
3614 | } else { |
3615 | pr_tmpl->pr_aptpl_active = 1; |
3616 | if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, |
3617 | &dest_pr_reg->pr_aptpl_buf[0], |
3618 | pr_tmpl->pr_aptpl_buf_len)) { |
3619 | pr_debug("SPC-3 PR: Set APTPL Bit Activated for" |
3620 | " REGISTER_AND_MOVE\n"); |
3621 | } |
3622 | } |
3623 | |
3624 | transport_kunmap_data_sg(cmd); |
3625 | |
3626 | core_scsi3_put_pr_reg(dest_pr_reg); |
3627 | return 0; |
3628 | out: |
3629 | if (buf) |
3630 | transport_kunmap_data_sg(cmd); |
3631 | if (dest_se_deve) |
3632 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
3633 | if (dest_node_acl) |
3634 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
3635 | core_scsi3_tpg_undepend_item(dest_se_tpg); |
3636 | |
3637 | out_put_pr_reg: |
3638 | core_scsi3_put_pr_reg(pr_reg); |
3639 | return ret; |
3640 | } |
3641 | |
3642 | static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) |
3643 | { |
3644 | unsigned int __v1, __v2; |
3645 | |
3646 | __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; |
3647 | __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; |
3648 | |
3649 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
3650 | } |
3651 | |
3652 | /* |
3653 | * See spc4r17 section 6.14 Table 170 |
3654 | */ |
3655 | sense_reason_t |
3656 | target_scsi3_emulate_pr_out(struct se_cmd *cmd) |
3657 | { |
3658 | unsigned char *cdb = &cmd->t_task_cdb[0]; |
3659 | unsigned char *buf; |
3660 | u64 res_key, sa_res_key; |
3661 | int sa, scope, type, aptpl; |
3662 | int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; |
3663 | sense_reason_t ret; |
3664 | |
3665 | /* |
3666 | * Following spc2r20 5.5.1 Reservations overview: |
3667 | * |
3668 | * If a logical unit has been reserved by any RESERVE command and is |
3669 | * still reserved by any initiator, all PERSISTENT RESERVE IN and all |
3670 | * PERSISTENT RESERVE OUT commands shall conflict regardless of |
3671 | * initiator or service action and shall terminate with a RESERVATION |
3672 | * CONFLICT status. |
3673 | */ |
3674 | if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { |
3675 | pr_err("Received PERSISTENT_RESERVE CDB while legacy" |
3676 | " SPC-2 reservation is held, returning" |
3677 | " RESERVATION_CONFLICT\n"); |
3678 | return TCM_RESERVATION_CONFLICT; |
3679 | } |
3680 | |
3681 | /* |
3682 | * FIXME: A NULL struct se_session pointer means an this is not coming from |
3683 | * a $FABRIC_MOD's nexus, but from internal passthrough ops. |
3684 | */ |
3685 | if (!cmd->se_sess) |
3686 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3687 | |
3688 | if (cmd->data_length < 24) { |
3689 | pr_warn("SPC-PR: Received PR OUT parameter list" |
3690 | " length too small: %u\n", cmd->data_length); |
3691 | return TCM_INVALID_PARAMETER_LIST; |
3692 | } |
3693 | |
3694 | /* |
3695 | * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) |
3696 | */ |
3697 | sa = (cdb[1] & 0x1f); |
3698 | scope = (cdb[2] & 0xf0); |
3699 | type = (cdb[2] & 0x0f); |
3700 | |
3701 | buf = transport_kmap_data_sg(cmd); |
3702 | if (!buf) |
3703 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3704 | |
3705 | /* |
3706 | * From PERSISTENT_RESERVE_OUT parameter list (payload) |
3707 | */ |
3708 | res_key = core_scsi3_extract_reservation_key(&buf[0]); |
3709 | sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); |
3710 | /* |
3711 | * REGISTER_AND_MOVE uses a different SA parameter list containing |
3712 | * SCSI TransportIDs. |
3713 | */ |
3714 | if (sa != PRO_REGISTER_AND_MOVE) { |
3715 | spec_i_pt = (buf[20] & 0x08); |
3716 | all_tg_pt = (buf[20] & 0x04); |
3717 | aptpl = (buf[20] & 0x01); |
3718 | } else { |
3719 | aptpl = (buf[17] & 0x01); |
3720 | unreg = (buf[17] & 0x02); |
3721 | } |
3722 | transport_kunmap_data_sg(cmd); |
3723 | buf = NULL; |
3724 | |
3725 | /* |
3726 | * SPEC_I_PT=1 is only valid for Service action: REGISTER |
3727 | */ |
3728 | if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) |
3729 | return TCM_INVALID_PARAMETER_LIST; |
3730 | |
3731 | /* |
3732 | * From spc4r17 section 6.14: |
3733 | * |
3734 | * If the SPEC_I_PT bit is set to zero, the service action is not |
3735 | * REGISTER AND MOVE, and the parameter list length is not 24, then |
3736 | * the command shall be terminated with CHECK CONDITION status, with |
3737 | * the sense key set to ILLEGAL REQUEST, and the additional sense |
3738 | * code set to PARAMETER LIST LENGTH ERROR. |
3739 | */ |
3740 | if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && |
3741 | (cmd->data_length != 24)) { |
3742 | pr_warn("SPC-PR: Received PR OUT illegal parameter" |
3743 | " list length: %u\n", cmd->data_length); |
3744 | return TCM_INVALID_PARAMETER_LIST; |
3745 | } |
3746 | |
3747 | /* |
3748 | * (core_scsi3_emulate_pro_* function parameters |
3749 | * are defined by spc4r17 Table 174: |
3750 | * PERSISTENT_RESERVE_OUT service actions and valid parameters. |
3751 | */ |
3752 | switch (sa) { |
3753 | case PRO_REGISTER: |
3754 | ret = core_scsi3_emulate_pro_register(cmd, |
3755 | res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); |
3756 | break; |
3757 | case PRO_RESERVE: |
3758 | ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); |
3759 | break; |
3760 | case PRO_RELEASE: |
3761 | ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); |
3762 | break; |
3763 | case PRO_CLEAR: |
3764 | ret = core_scsi3_emulate_pro_clear(cmd, res_key); |
3765 | break; |
3766 | case PRO_PREEMPT: |
3767 | ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, |
3768 | res_key, sa_res_key, 0); |
3769 | break; |
3770 | case PRO_PREEMPT_AND_ABORT: |
3771 | ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, |
3772 | res_key, sa_res_key, 1); |
3773 | break; |
3774 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: |
3775 | ret = core_scsi3_emulate_pro_register(cmd, |
3776 | 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); |
3777 | break; |
3778 | case PRO_REGISTER_AND_MOVE: |
3779 | ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, |
3780 | sa_res_key, aptpl, unreg); |
3781 | break; |
3782 | default: |
3783 | pr_err("Unknown PERSISTENT_RESERVE_OUT service" |
3784 | " action: 0x%02x\n", cdb[1] & 0x1f); |
3785 | return TCM_INVALID_CDB_FIELD; |
3786 | } |
3787 | |
3788 | if (!ret) |
3789 | target_complete_cmd(cmd, GOOD); |
3790 | return ret; |
3791 | } |
3792 | |
3793 | /* |
3794 | * PERSISTENT_RESERVE_IN Service Action READ_KEYS |
3795 | * |
3796 | * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 |
3797 | */ |
3798 | static sense_reason_t |
3799 | core_scsi3_pri_read_keys(struct se_cmd *cmd) |
3800 | { |
3801 | struct se_device *dev = cmd->se_dev; |
3802 | struct t10_pr_registration *pr_reg; |
3803 | unsigned char *buf; |
3804 | u32 add_len = 0, off = 8; |
3805 | |
3806 | if (cmd->data_length < 8) { |
3807 | pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" |
3808 | " too small\n", cmd->data_length); |
3809 | return TCM_INVALID_CDB_FIELD; |
3810 | } |
3811 | |
3812 | buf = transport_kmap_data_sg(cmd); |
3813 | if (!buf) |
3814 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3815 | |
3816 | buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
3817 | buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
3818 | buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
3819 | buf[3] = (dev->t10_pr.pr_generation & 0xff); |
3820 | |
3821 | spin_lock(&dev->t10_pr.registration_lock); |
3822 | list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, |
3823 | pr_reg_list) { |
3824 | /* |
3825 | * Check for overflow of 8byte PRI READ_KEYS payload and |
3826 | * next reservation key list descriptor. |
3827 | */ |
3828 | if ((add_len + 8) > (cmd->data_length - 8)) |
3829 | break; |
3830 | |
3831 | buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
3832 | buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
3833 | buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
3834 | buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
3835 | buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
3836 | buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
3837 | buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
3838 | buf[off++] = (pr_reg->pr_res_key & 0xff); |
3839 | |
3840 | add_len += 8; |
3841 | } |
3842 | spin_unlock(&dev->t10_pr.registration_lock); |
3843 | |
3844 | buf[4] = ((add_len >> 24) & 0xff); |
3845 | buf[5] = ((add_len >> 16) & 0xff); |
3846 | buf[6] = ((add_len >> 8) & 0xff); |
3847 | buf[7] = (add_len & 0xff); |
3848 | |
3849 | transport_kunmap_data_sg(cmd); |
3850 | |
3851 | return 0; |
3852 | } |
3853 | |
3854 | /* |
3855 | * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION |
3856 | * |
3857 | * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 |
3858 | */ |
3859 | static sense_reason_t |
3860 | core_scsi3_pri_read_reservation(struct se_cmd *cmd) |
3861 | { |
3862 | struct se_device *dev = cmd->se_dev; |
3863 | struct t10_pr_registration *pr_reg; |
3864 | unsigned char *buf; |
3865 | u64 pr_res_key; |
3866 | u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ |
3867 | |
3868 | if (cmd->data_length < 8) { |
3869 | pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" |
3870 | " too small\n", cmd->data_length); |
3871 | return TCM_INVALID_CDB_FIELD; |
3872 | } |
3873 | |
3874 | buf = transport_kmap_data_sg(cmd); |
3875 | if (!buf) |
3876 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3877 | |
3878 | buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
3879 | buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
3880 | buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
3881 | buf[3] = (dev->t10_pr.pr_generation & 0xff); |
3882 | |
3883 | spin_lock(&dev->dev_reservation_lock); |
3884 | pr_reg = dev->dev_pr_res_holder; |
3885 | if (pr_reg) { |
3886 | /* |
3887 | * Set the hardcoded Additional Length |
3888 | */ |
3889 | buf[4] = ((add_len >> 24) & 0xff); |
3890 | buf[5] = ((add_len >> 16) & 0xff); |
3891 | buf[6] = ((add_len >> 8) & 0xff); |
3892 | buf[7] = (add_len & 0xff); |
3893 | |
3894 | if (cmd->data_length < 22) |
3895 | goto err; |
3896 | |
3897 | /* |
3898 | * Set the Reservation key. |
3899 | * |
3900 | * From spc4r17, section 5.7.10: |
3901 | * A persistent reservation holder has its reservation key |
3902 | * returned in the parameter data from a PERSISTENT |
3903 | * RESERVE IN command with READ RESERVATION service action as |
3904 | * follows: |
3905 | * a) For a persistent reservation of the type Write Exclusive |
3906 | * - All Registrants or Exclusive Access  All Regitrants, |
3907 | * the reservation key shall be set to zero; or |
3908 | * b) For all other persistent reservation types, the |
3909 | * reservation key shall be set to the registered |
3910 | * reservation key for the I_T nexus that holds the |
3911 | * persistent reservation. |
3912 | */ |
3913 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
3914 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) |
3915 | pr_res_key = 0; |
3916 | else |
3917 | pr_res_key = pr_reg->pr_res_key; |
3918 | |
3919 | buf[8] = ((pr_res_key >> 56) & 0xff); |
3920 | buf[9] = ((pr_res_key >> 48) & 0xff); |
3921 | buf[10] = ((pr_res_key >> 40) & 0xff); |
3922 | buf[11] = ((pr_res_key >> 32) & 0xff); |
3923 | buf[12] = ((pr_res_key >> 24) & 0xff); |
3924 | buf[13] = ((pr_res_key >> 16) & 0xff); |
3925 | buf[14] = ((pr_res_key >> 8) & 0xff); |
3926 | buf[15] = (pr_res_key & 0xff); |
3927 | /* |
3928 | * Set the SCOPE and TYPE |
3929 | */ |
3930 | buf[21] = (pr_reg->pr_res_scope & 0xf0) | |
3931 | (pr_reg->pr_res_type & 0x0f); |
3932 | } |
3933 | |
3934 | err: |
3935 | spin_unlock(&dev->dev_reservation_lock); |
3936 | transport_kunmap_data_sg(cmd); |
3937 | |
3938 | return 0; |
3939 | } |
3940 | |
3941 | /* |
3942 | * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES |
3943 | * |
3944 | * See spc4r17 section 6.13.4 Table 165 |
3945 | */ |
3946 | static sense_reason_t |
3947 | core_scsi3_pri_report_capabilities(struct se_cmd *cmd) |
3948 | { |
3949 | struct se_device *dev = cmd->se_dev; |
3950 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
3951 | unsigned char *buf; |
3952 | u16 add_len = 8; /* Hardcoded to 8. */ |
3953 | |
3954 | if (cmd->data_length < 6) { |
3955 | pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" |
3956 | " %u too small\n", cmd->data_length); |
3957 | return TCM_INVALID_CDB_FIELD; |
3958 | } |
3959 | |
3960 | buf = transport_kmap_data_sg(cmd); |
3961 | if (!buf) |
3962 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
3963 | |
3964 | buf[0] = ((add_len << 8) & 0xff); |
3965 | buf[1] = (add_len & 0xff); |
3966 | buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ |
3967 | buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ |
3968 | buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ |
3969 | buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ |
3970 | /* |
3971 | * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so |
3972 | * set the TMV: Task Mask Valid bit. |
3973 | */ |
3974 | buf[3] |= 0x80; |
3975 | /* |
3976 | * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 |
3977 | */ |
3978 | buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ |
3979 | /* |
3980 | * PTPL_A: Persistence across Target Power Loss Active bit |
3981 | */ |
3982 | if (pr_tmpl->pr_aptpl_active) |
3983 | buf[3] |= 0x01; |
3984 | /* |
3985 | * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 |
3986 | */ |
3987 | buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ |
3988 | buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ |
3989 | buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ |
3990 | buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ |
3991 | buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ |
3992 | buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ |
3993 | |
3994 | transport_kunmap_data_sg(cmd); |
3995 | |
3996 | return 0; |
3997 | } |
3998 | |
3999 | /* |
4000 | * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS |
4001 | * |
4002 | * See spc4r17 section 6.13.5 Table 168 and 169 |
4003 | */ |
4004 | static sense_reason_t |
4005 | core_scsi3_pri_read_full_status(struct se_cmd *cmd) |
4006 | { |
4007 | struct se_device *dev = cmd->se_dev; |
4008 | struct se_node_acl *se_nacl; |
4009 | struct se_portal_group *se_tpg; |
4010 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
4011 | struct t10_reservation *pr_tmpl = &dev->t10_pr; |
4012 | unsigned char *buf; |
4013 | u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; |
4014 | u32 off = 8; /* off into first Full Status descriptor */ |
4015 | int format_code = 0; |
4016 | |
4017 | if (cmd->data_length < 8) { |
4018 | pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" |
4019 | " too small\n", cmd->data_length); |
4020 | return TCM_INVALID_CDB_FIELD; |
4021 | } |
4022 | |
4023 | buf = transport_kmap_data_sg(cmd); |
4024 | if (!buf) |
4025 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
4026 | |
4027 | buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
4028 | buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
4029 | buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
4030 | buf[3] = (dev->t10_pr.pr_generation & 0xff); |
4031 | |
4032 | spin_lock(&pr_tmpl->registration_lock); |
4033 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
4034 | &pr_tmpl->registration_list, pr_reg_list) { |
4035 | |
4036 | se_nacl = pr_reg->pr_reg_nacl; |
4037 | se_tpg = pr_reg->pr_reg_nacl->se_tpg; |
4038 | add_desc_len = 0; |
4039 | |
4040 | atomic_inc(&pr_reg->pr_res_holders); |
4041 | smp_mb__after_atomic_inc(); |
4042 | spin_unlock(&pr_tmpl->registration_lock); |
4043 | /* |
4044 | * Determine expected length of $FABRIC_MOD specific |
4045 | * TransportID full status descriptor.. |
4046 | */ |
4047 | exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( |
4048 | se_tpg, se_nacl, pr_reg, &format_code); |
4049 | |
4050 | if ((exp_desc_len + add_len) > cmd->data_length) { |
4051 | pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" |
4052 | " out of buffer: %d\n", cmd->data_length); |
4053 | spin_lock(&pr_tmpl->registration_lock); |
4054 | atomic_dec(&pr_reg->pr_res_holders); |
4055 | smp_mb__after_atomic_dec(); |
4056 | break; |
4057 | } |
4058 | /* |
4059 | * Set RESERVATION KEY |
4060 | */ |
4061 | buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
4062 | buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
4063 | buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
4064 | buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
4065 | buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
4066 | buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
4067 | buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
4068 | buf[off++] = (pr_reg->pr_res_key & 0xff); |
4069 | off += 4; /* Skip Over Reserved area */ |
4070 | |
4071 | /* |
4072 | * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. |
4073 | */ |
4074 | if (pr_reg->pr_reg_all_tg_pt) |
4075 | buf[off] = 0x02; |
4076 | /* |
4077 | * The struct se_lun pointer will be present for the |
4078 | * reservation holder for PR_HOLDER bit. |
4079 | * |
4080 | * Also, if this registration is the reservation |
4081 | * holder, fill in SCOPE and TYPE in the next byte. |
4082 | */ |
4083 | if (pr_reg->pr_res_holder) { |
4084 | buf[off++] |= 0x01; |
4085 | buf[off++] = (pr_reg->pr_res_scope & 0xf0) | |
4086 | (pr_reg->pr_res_type & 0x0f); |
4087 | } else |
4088 | off += 2; |
4089 | |
4090 | off += 4; /* Skip over reserved area */ |
4091 | /* |
4092 | * From spc4r17 6.3.15: |
4093 | * |
4094 | * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT |
4095 | * IDENTIFIER field contains the relative port identifier (see |
4096 | * 3.1.120) of the target port that is part of the I_T nexus |
4097 | * described by this full status descriptor. If the ALL_TG_PT |
4098 | * bit is set to one, the contents of the RELATIVE TARGET PORT |
4099 | * IDENTIFIER field are not defined by this standard. |
4100 | */ |
4101 | if (!pr_reg->pr_reg_all_tg_pt) { |
4102 | struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; |
4103 | |
4104 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); |
4105 | buf[off++] = (port->sep_rtpi & 0xff); |
4106 | } else |
4107 | off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ |
4108 | |
4109 | /* |
4110 | * Now, have the $FABRIC_MOD fill in the protocol identifier |
4111 | */ |
4112 | desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, |
4113 | se_nacl, pr_reg, &format_code, &buf[off+4]); |
4114 | |
4115 | spin_lock(&pr_tmpl->registration_lock); |
4116 | atomic_dec(&pr_reg->pr_res_holders); |
4117 | smp_mb__after_atomic_dec(); |
4118 | /* |
4119 | * Set the ADDITIONAL DESCRIPTOR LENGTH |
4120 | */ |
4121 | buf[off++] = ((desc_len >> 24) & 0xff); |
4122 | buf[off++] = ((desc_len >> 16) & 0xff); |
4123 | buf[off++] = ((desc_len >> 8) & 0xff); |
4124 | buf[off++] = (desc_len & 0xff); |
4125 | /* |
4126 | * Size of full desctipor header minus TransportID |
4127 | * containing $FABRIC_MOD specific) initiator device/port |
4128 | * WWN information. |
4129 | * |
4130 | * See spc4r17 Section 6.13.5 Table 169 |
4131 | */ |
4132 | add_desc_len = (24 + desc_len); |
4133 | |
4134 | off += desc_len; |
4135 | add_len += add_desc_len; |
4136 | } |
4137 | spin_unlock(&pr_tmpl->registration_lock); |
4138 | /* |
4139 | * Set ADDITIONAL_LENGTH |
4140 | */ |
4141 | buf[4] = ((add_len >> 24) & 0xff); |
4142 | buf[5] = ((add_len >> 16) & 0xff); |
4143 | buf[6] = ((add_len >> 8) & 0xff); |
4144 | buf[7] = (add_len & 0xff); |
4145 | |
4146 | transport_kunmap_data_sg(cmd); |
4147 | |
4148 | return 0; |
4149 | } |
4150 | |
4151 | sense_reason_t |
4152 | target_scsi3_emulate_pr_in(struct se_cmd *cmd) |
4153 | { |
4154 | sense_reason_t ret; |
4155 | |
4156 | /* |
4157 | * Following spc2r20 5.5.1 Reservations overview: |
4158 | * |
4159 | * If a logical unit has been reserved by any RESERVE command and is |
4160 | * still reserved by any initiator, all PERSISTENT RESERVE IN and all |
4161 | * PERSISTENT RESERVE OUT commands shall conflict regardless of |
4162 | * initiator or service action and shall terminate with a RESERVATION |
4163 | * CONFLICT status. |
4164 | */ |
4165 | if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { |
4166 | pr_err("Received PERSISTENT_RESERVE CDB while legacy" |
4167 | " SPC-2 reservation is held, returning" |
4168 | " RESERVATION_CONFLICT\n"); |
4169 | return TCM_RESERVATION_CONFLICT; |
4170 | } |
4171 | |
4172 | switch (cmd->t_task_cdb[1] & 0x1f) { |
4173 | case PRI_READ_KEYS: |
4174 | ret = core_scsi3_pri_read_keys(cmd); |
4175 | break; |
4176 | case PRI_READ_RESERVATION: |
4177 | ret = core_scsi3_pri_read_reservation(cmd); |
4178 | break; |
4179 | case PRI_REPORT_CAPABILITIES: |
4180 | ret = core_scsi3_pri_report_capabilities(cmd); |
4181 | break; |
4182 | case PRI_READ_FULL_STATUS: |
4183 | ret = core_scsi3_pri_read_full_status(cmd); |
4184 | break; |
4185 | default: |
4186 | pr_err("Unknown PERSISTENT_RESERVE_IN service" |
4187 | " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); |
4188 | return TCM_INVALID_CDB_FIELD; |
4189 | } |
4190 | |
4191 | if (!ret) |
4192 | target_complete_cmd(cmd, GOOD); |
4193 | return ret; |
4194 | } |
4195 | |
4196 | sense_reason_t |
4197 | target_check_reservation(struct se_cmd *cmd) |
4198 | { |
4199 | struct se_device *dev = cmd->se_dev; |
4200 | sense_reason_t ret; |
4201 | |
4202 | if (!cmd->se_sess) |
4203 | return 0; |
4204 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) |
4205 | return 0; |
4206 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
4207 | return 0; |
4208 | |
4209 | spin_lock(&dev->dev_reservation_lock); |
4210 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) |
4211 | ret = target_scsi2_reservation_check(cmd); |
4212 | else |
4213 | ret = target_scsi3_pr_reservation_check(cmd); |
4214 | spin_unlock(&dev->dev_reservation_lock); |
4215 | |
4216 | return ret; |
4217 | } |
4218 |
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