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Revert "dsdb: Only parse SAMBA_LDAP_MATCH_RULE_TRANSITIVE_EVAL as a DN"
[Samba.git] / source3 / smbd / oplock.c
blob4d84347924ecf6f04ef30833543c64c208dc5ee7
1 /*
2 Unix SMB/CIFS implementation.
3 oplock processing
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998 - 2001
6 Copyright (C) Volker Lendecke 2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #define DBGC_CLASS DBGC_LOCKING
23 #include "includes.h"
24 #include "smbd/smbd.h"
25 #include "smbd/globals.h"
26 #include "messages.h"
27 #include "../librpc/gen_ndr/open_files.h"
28
29 /*
30 * helper function used by the kernel oplock backends to post the break message
31 */
32 void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
33 {
34 uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
35
36 /* Put the kernel break info into the message. */
37 push_file_id_24((char *)msg, &fsp->file_id);
38 SIVAL(msg,24,fsp->fh->gen_id);
39
40 /* Don't need to be root here as we're only ever
41 sending to ourselves. */
42
43 messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
44 MSG_SMB_KERNEL_BREAK,
45 msg, MSG_SMB_KERNEL_BREAK_SIZE);
46 }
47
48 /****************************************************************************
49 Attempt to set an oplock on a file. Succeeds if kernel oplocks are
50 disabled (just sets flags).
51 ****************************************************************************/
52
53 NTSTATUS set_file_oplock(files_struct *fsp)
54 {
55 struct smbd_server_connection *sconn = fsp->conn->sconn;
56 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
57 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
58
59 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
60 if (use_kernel &&
61 !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
62 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
63 "don't support them\n"));
64 return NT_STATUS_NOT_SUPPORTED;
65 }
66 }
67
68 if ((fsp->oplock_type != NO_OPLOCK) &&
69 use_kernel &&
70 !koplocks->ops->set_oplock(koplocks, fsp, fsp->oplock_type))
71 {
72 return map_nt_error_from_unix(errno);
73 }
74
75 fsp->sent_oplock_break = NO_BREAK_SENT;
76 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
77 sconn->oplocks.level_II_open++;
78 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
79 sconn->oplocks.exclusive_open++;
80 }
81
82 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
83 "tv_sec = %x, tv_usec = %x\n",
84 fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
85 fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
86 (int)fsp->open_time.tv_usec ));
87
88 return NT_STATUS_OK;
89 }
90
91 /****************************************************************************
92 Attempt to release an oplock on a file. Decrements oplock count.
93 ****************************************************************************/
94
95 static void release_file_oplock(files_struct *fsp)
96 {
97 struct smbd_server_connection *sconn = fsp->conn->sconn;
98 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
99
100 if ((fsp->oplock_type != NO_OPLOCK) &&
101 koplocks) {
102 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
103 }
104
105 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
106 sconn->oplocks.level_II_open--;
107 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
108 sconn->oplocks.exclusive_open--;
109 }
110
111 SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
112 SMB_ASSERT(sconn->oplocks.level_II_open>=0);
113
114 fsp->oplock_type = NO_OPLOCK;
115 fsp->sent_oplock_break = NO_BREAK_SENT;
116
117 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
118 delete_write_cache(fsp);
119
120 TALLOC_FREE(fsp->oplock_timeout);
121 }
122
123 /****************************************************************************
124 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
125 ****************************************************************************/
126
127 static void downgrade_file_oplock(files_struct *fsp)
128 {
129 struct smbd_server_connection *sconn = fsp->conn->sconn;
130 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
131
132 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
133 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
134 return;
135 }
136
137 if (koplocks) {
138 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
139 }
140 fsp->oplock_type = LEVEL_II_OPLOCK;
141 sconn->oplocks.exclusive_open--;
142 sconn->oplocks.level_II_open++;
143 fsp->sent_oplock_break = NO_BREAK_SENT;
144
145 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
146 delete_write_cache(fsp);
147
148 TALLOC_FREE(fsp->oplock_timeout);
149 }
150
151 uint32_t map_oplock_to_lease_type(uint16_t op_type)
152 {
153 uint32_t ret;
154
155 switch(op_type) {
156 case BATCH_OPLOCK:
157 case BATCH_OPLOCK|EXCLUSIVE_OPLOCK:
158 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE;
159 break;
160 case EXCLUSIVE_OPLOCK:
161 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE;
162 break;
163 case LEVEL_II_OPLOCK:
164 ret = SMB2_LEASE_READ;
165 break;
166 default:
167 ret = SMB2_LEASE_NONE;
168 break;
169 }
170 return ret;
171 }
172
173 uint32_t get_lease_type(struct share_mode_data *d, struct share_mode_entry *e)
174 {
175 if (e->op_type == LEASE_OPLOCK) {
176 return d->leases[e->lease_idx].current_state;
177 }
178 return map_oplock_to_lease_type(e->op_type);
179 }
180
181 bool update_num_read_oplocks(files_struct *fsp, struct share_mode_lock *lck)
182 {
183 struct share_mode_data *d = lck->data;
184 struct byte_range_lock *br_lck;
185 uint32_t num_read_oplocks = 0;
186 uint32_t i;
187
188 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
189 /*
190 * If we're the only one, we don't need a brlock entry
191 */
192 SMB_ASSERT(d->num_share_modes == 1);
193 SMB_ASSERT(EXCLUSIVE_OPLOCK_TYPE(d->share_modes[0].op_type));
194 return true;
195 }
196
197 for (i=0; i<d->num_share_modes; i++) {
198 struct share_mode_entry *e = &d->share_modes[i];
199 uint32_t e_lease_type = get_lease_type(d, e);
200
201 if (e_lease_type & SMB2_LEASE_READ) {
202 num_read_oplocks += 1;
203 }
204 }
205
206 br_lck = brl_get_locks_readonly(fsp);
207 if (br_lck == NULL) {
208 return false;
209 }
210 if (brl_num_read_oplocks(br_lck) == num_read_oplocks) {
211 return true;
212 }
213
214 br_lck = brl_get_locks(talloc_tos(), fsp);
215 if (br_lck == NULL) {
216 return false;
217 }
218 brl_set_num_read_oplocks(br_lck, num_read_oplocks);
219 TALLOC_FREE(br_lck);
220 return true;
221 }
222
223 /****************************************************************************
224 Remove a file oplock. Copes with level II and exclusive.
225 Locks then unlocks the share mode lock. Client can decide to go directly
226 to none even if a "break-to-level II" was sent.
227 ****************************************************************************/
228
229 bool remove_oplock(files_struct *fsp)
230 {
231 bool ret;
232 struct share_mode_lock *lck;
233
234 DEBUG(10, ("remove_oplock called for %s\n",
235 fsp_str_dbg(fsp)));
236
237 /* Remove the oplock flag from the sharemode. */
238 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
239 if (lck == NULL) {
240 DEBUG(0,("remove_oplock: failed to lock share entry for "
241 "file %s\n", fsp_str_dbg(fsp)));
242 return False;
243 }
244
245 ret = remove_share_oplock(lck, fsp);
246 if (!ret) {
247 DEBUG(0,("remove_oplock: failed to remove share oplock for "
248 "file %s, %s, %s\n",
249 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
250 file_id_string_tos(&fsp->file_id)));
251 }
252 release_file_oplock(fsp);
253
254 ret = update_num_read_oplocks(fsp, lck);
255 if (!ret) {
256 DEBUG(0, ("%s: update_num_read_oplocks failed for "
257 "file %s, %s, %s\n",
258 __func__, fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
259 file_id_string_tos(&fsp->file_id)));
260 }
261
262 TALLOC_FREE(lck);
263 return ret;
264 }
265
266 /*
267 * Deal with a reply when a break-to-level II was sent.
268 */
269 bool downgrade_oplock(files_struct *fsp)
270 {
271 bool ret;
272 struct share_mode_lock *lck;
273
274 DEBUG(10, ("downgrade_oplock called for %s\n",
275 fsp_str_dbg(fsp)));
276
277 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
278 if (lck == NULL) {
279 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
280 "file %s\n", fsp_str_dbg(fsp)));
281 return False;
282 }
283 ret = downgrade_share_oplock(lck, fsp);
284 if (!ret) {
285 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
286 "for file %s, %s, file_id %s\n",
287 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
288 file_id_string_tos(&fsp->file_id)));
289 }
290 downgrade_file_oplock(fsp);
291
292 ret = update_num_read_oplocks(fsp, lck);
293 if (!ret) {
294 DEBUG(0, ("%s: update_num_read_oplocks failed for "
295 "file %s, %s, %s\n",
296 __func__, fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
297 file_id_string_tos(&fsp->file_id)));
298 }
299
300 TALLOC_FREE(lck);
301 return ret;
302 }
303
304 static void lease_timeout_handler(struct tevent_context *ctx,
305 struct tevent_timer *te,
306 struct timeval now,
307 void *private_data)
308 {
309 struct fsp_lease *lease =
310 talloc_get_type_abort(private_data,
311 struct fsp_lease);
312 struct files_struct *fsp;
313 struct share_mode_lock *lck;
314 uint16_t old_epoch = lease->lease.lease_epoch;
315
316 fsp = file_find_one_fsp_from_lease_key(lease->sconn,
317 &lease->lease.lease_key);
318 if (fsp == NULL) {
319 /* race? */
320 TALLOC_FREE(lease->timeout);
321 return;
322 }
323
324 lck = get_existing_share_mode_lock(
325 talloc_tos(), fsp->file_id);
326 if (lck == NULL) {
327 /* race? */
328 TALLOC_FREE(lease->timeout);
329 return;
330 }
331
332 fsp_lease_update(lck, fsp_client_guid(fsp), lease);
333
334 if (lease->lease.lease_epoch != old_epoch) {
335 /*
336 * If the epoch changed we need to wait for
337 * the next timeout to happen.
338 */
339 DEBUG(10, ("lease break timeout race (epoch) for file %s - ignoring\n",
340 fsp_str_dbg(fsp)));
341 TALLOC_FREE(lck);
342 return;
343 }
344
345 if (!(lease->lease.lease_flags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)) {
346 /*
347 * If the epoch changed we need to wait for
348 * the next timeout to happen.
349 */
350 DEBUG(10, ("lease break timeout race (flags) for file %s - ignoring\n",
351 fsp_str_dbg(fsp)));
352 TALLOC_FREE(lck);
353 return;
354 }
355
356 DEBUG(1, ("lease break timed out for file %s -- replying anyway\n",
357 fsp_str_dbg(fsp)));
358 (void)downgrade_lease(lease->sconn->client->connections,
359 1,
360 &fsp->file_id,
361 &lease->lease.lease_key,
362 SMB2_LEASE_NONE);
363
364 TALLOC_FREE(lck);
365 }
366
367 bool fsp_lease_update(struct share_mode_lock *lck,
368 const struct GUID *client_guid,
369 struct fsp_lease *lease)
370 {
371 struct share_mode_data *d = lck->data;
372 int idx;
373 struct share_mode_lease *l = NULL;
374
375 idx = find_share_mode_lease(d, client_guid, &lease->lease.lease_key);
376 if (idx != -1) {
377 l = &d->leases[idx];
378 }
379
380 if (l == NULL) {
381 DEBUG(1, ("%s: Could not find lease entry\n", __func__));
382 TALLOC_FREE(lease->timeout);
383 lease->lease.lease_state = SMB2_LEASE_NONE;
384 lease->lease.lease_epoch += 1;
385 lease->lease.lease_flags = 0;
386 return false;
387 }
388
389 DEBUG(10,("%s: refresh lease state\n", __func__));
390
391 /* Ensure we're in sync with current lease state. */
392 if (lease->lease.lease_epoch != l->epoch) {
393 DEBUG(10,("%s: cancel outdated timeout\n", __func__));
394 TALLOC_FREE(lease->timeout);
395 }
396 lease->lease.lease_epoch = l->epoch;
397 lease->lease.lease_state = l->current_state;
398
399 if (l->breaking) {
400 lease->lease.lease_flags |= SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
401
402 if (lease->timeout == NULL) {
403 struct timeval t = timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0);
404
405 DEBUG(10,("%s: setup timeout handler\n", __func__));
406
407 lease->timeout = tevent_add_timer(lease->sconn->ev_ctx,
408 lease, t,
409 lease_timeout_handler,
410 lease);
411 if (lease->timeout == NULL) {
412 DEBUG(0, ("%s: Could not add lease timeout handler\n",
413 __func__));
414 }
415 }
416 } else {
417 lease->lease.lease_flags &= ~SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
418 TALLOC_FREE(lease->timeout);
419 }
420
421 return true;
422 }
423
424 struct downgrade_lease_additional_state {
425 struct tevent_immediate *im;
426 struct smbXsrv_connection *xconn;
427 uint32_t break_flags;
428 struct smb2_lease_key lease_key;
429 uint32_t break_from;
430 uint32_t break_to;
431 uint16_t new_epoch;
432 };
433
434 static void downgrade_lease_additional_trigger(struct tevent_context *ev,
435 struct tevent_immediate *im,
436 void *private_data)
437 {
438 struct downgrade_lease_additional_state *state =
439 talloc_get_type_abort(private_data,
440 struct downgrade_lease_additional_state);
441 struct smbXsrv_connection *xconn = state->xconn;
442 NTSTATUS status;
443
444 status = smbd_smb2_send_lease_break(xconn,
445 state->new_epoch,
446 state->break_flags,
447 &state->lease_key,
448 state->break_from,
449 state->break_to);
450 TALLOC_FREE(state);
451 if (!NT_STATUS_IS_OK(status)) {
452 smbd_server_connection_terminate(xconn,
453 nt_errstr(status));
454 return;
455 }
456 }
457
458 struct downgrade_lease_fsps_state {
459 struct file_id id;
460 struct share_mode_lock *lck;
461 const struct smb2_lease_key *key;
462 };
463
464 static struct files_struct *downgrade_lease_fsps(struct files_struct *fsp,
465 void *private_data)
466 {
467 struct downgrade_lease_fsps_state *state =
468 (struct downgrade_lease_fsps_state *)private_data;
469
470 if (fsp->oplock_type != LEASE_OPLOCK) {
471 return NULL;
472 }
473 if (!smb2_lease_key_equal(&fsp->lease->lease.lease_key, state->key)) {
474 return NULL;
475 }
476 if (!file_id_equal(&fsp->file_id, &state->id)) {
477 return NULL;
478 }
479
480 fsp_lease_update(state->lck, fsp_client_guid(fsp), fsp->lease);
481
482 return NULL;
483 }
484
485 NTSTATUS downgrade_lease(struct smbXsrv_connection *xconn,
486 uint32_t num_file_ids,
487 const struct file_id *ids,
488 const struct smb2_lease_key *key,
489 uint32_t lease_state)
490 {
491 struct smbd_server_connection *sconn = xconn->client->sconn;
492 struct share_mode_lock *lck;
493 struct share_mode_lease *l = NULL;
494 const struct file_id id = ids[0];
495 uint32_t i;
496 NTSTATUS status;
497
498 DEBUG(10, ("%s: Downgrading %s to %x\n", __func__,
499 file_id_string_tos(&id), (unsigned)lease_state));
500
501 lck = get_existing_share_mode_lock(talloc_tos(), id);
502 if (lck == NULL) {
503 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
504 }
505 status = downgrade_share_lease(sconn, lck, key, lease_state, &l);
506
507 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
508 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
509
510 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
511 struct downgrade_lease_additional_state *state;
512
513 state = talloc_zero(xconn,
514 struct downgrade_lease_additional_state);
515 if (state == NULL) {
516 TALLOC_FREE(lck);
517 return NT_STATUS_NO_MEMORY;
518 }
519
520 state->im = tevent_create_immediate(state);
521 if (state->im == NULL) {
522 TALLOC_FREE(state);
523 TALLOC_FREE(lck);
524 return NT_STATUS_NO_MEMORY;
525 }
526
527 state->xconn = xconn;
528 if (l->current_state & (~SMB2_LEASE_READ)) {
529 state->break_flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
530 }
531 state->lease_key = l->lease_key;
532 state->break_from = l->current_state;
533 state->break_to = l->breaking_to_requested;
534 if (l->lease_version > 1) {
535 state->new_epoch = l->epoch;
536 }
537
538 if (state->break_flags == 0) {
539 /*
540 * This is an async break without
541 * SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED
542 *
543 * we need to store NONE state in the
544 * database.
545 */
546 l->current_state = 0;
547 l->breaking_to_requested = 0;
548 l->breaking_to_required = 0;
549 l->breaking = false;
550
551 lck->data->modified = true;
552 }
553
554 tevent_schedule_immediate(state->im, xconn->ev_ctx,
555 downgrade_lease_additional_trigger,
556 state);
557 }
558
559 {
560 struct downgrade_lease_fsps_state state = {
561 .id = id, .lck = lck, .key = key,
562 };
563
564 files_forall(sconn, downgrade_lease_fsps, &state);
565 }
566
567 TALLOC_FREE(lck);
568 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
569 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
570
571 /*
572 * Dynamic share case. Ensure other opens are copies.
573 * This will only be breaking to NONE.
574 */
575
576 for (i = 1; i < num_file_ids; i++) {
577 lck = get_existing_share_mode_lock(talloc_tos(), ids[i]);
578 if (lck == NULL) {
579 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
580 }
581
582 {
583 struct downgrade_lease_fsps_state state = {
584 .id = ids[i], .lck = lck, .key = key,
585 };
586
587 files_forall(sconn, downgrade_lease_fsps, &state);
588 }
589
590 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
591 file_id_string_tos(&ids[i]), (unsigned)lease_state, nt_errstr(status)));
592
593 TALLOC_FREE(lck);
594 }
595
596 return status;
597 }
598
599 /****************************************************************************
600 Set up an oplock break message.
601 ****************************************************************************/
602
603 #define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
604
605 static void new_break_message_smb1(files_struct *fsp, int cmd,
606 char result[SMB1_BREAK_MESSAGE_LENGTH])
607 {
608 memset(result,'\0',smb_size);
609 srv_set_message(result,8,0,true);
610 SCVAL(result,smb_com,SMBlockingX);
611 SSVAL(result,smb_tid,fsp->conn->cnum);
612 SSVAL(result,smb_pid,0xFFFF);
613 SSVAL(result,smb_uid,0);
614 SSVAL(result,smb_mid,0xFFFF);
615 SCVAL(result,smb_vwv0,0xFF);
616 SSVAL(result,smb_vwv2,fsp->fnum);
617 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
618 SCVAL(result,smb_vwv3+1,cmd);
619 }
620
621 /****************************************************************************
622 Function to do the waiting before sending a local break.
623 ****************************************************************************/
624
625 static void wait_before_sending_break(void)
626 {
627 long wait_time = (long)lp_oplock_break_wait_time();
628
629 if (wait_time) {
630 smb_msleep(wait_time);
631 }
632 }
633
634 /****************************************************************************
635 Ensure that we have a valid oplock.
636 ****************************************************************************/
637
638 static files_struct *initial_break_processing(
639 struct smbd_server_connection *sconn, struct file_id id,
640 unsigned long file_id)
641 {
642 files_struct *fsp = NULL;
643
644 DEBUG(3, ("initial_break_processing: called for %s/%u\n"
645 "Current oplocks_open (exclusive = %d, levelII = %d)\n",
646 file_id_string_tos(&id), (int)file_id,
647 sconn->oplocks.exclusive_open,
648 sconn->oplocks.level_II_open));
649
650 /*
651 * We need to search the file open table for the
652 * entry containing this dev and inode, and ensure
653 * we have an oplock on it.
654 */
655
656 fsp = file_find_dif(sconn, id, file_id);
657
658 if(fsp == NULL) {
659 /* The file could have been closed in the meantime - return success. */
660 DEBUG(3, ("initial_break_processing: cannot find open file "
661 "with file_id %s gen_id = %lu, allowing break to "
662 "succeed.\n", file_id_string_tos(&id), file_id));
663 return NULL;
664 }
665
666 /* Ensure we have an oplock on the file */
667
668 /*
669 * There is a potential race condition in that an oplock could
670 * have been broken due to another udp request, and yet there are
671 * still oplock break messages being sent in the udp message
672 * queue for this file. So return true if we don't have an oplock,
673 * as we may have just freed it.
674 */
675
676 if(fsp->oplock_type == NO_OPLOCK) {
677 DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
678 "gen_id = %lu) has no oplock. Allowing break to "
679 "succeed regardless.\n", fsp_str_dbg(fsp),
680 file_id_string_tos(&id), fsp->fh->gen_id));
681 return NULL;
682 }
683
684 return fsp;
685 }
686
687 static void oplock_timeout_handler(struct tevent_context *ctx,
688 struct tevent_timer *te,
689 struct timeval now,
690 void *private_data)
691 {
692 files_struct *fsp = (files_struct *)private_data;
693
694 SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
695
696 /* Remove the timed event handler. */
697 TALLOC_FREE(fsp->oplock_timeout);
698 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
699 fsp_str_dbg(fsp)));
700 remove_oplock(fsp);
701 }
702
703 /*******************************************************************
704 Add a timeout handler waiting for the client reply.
705 *******************************************************************/
706
707 static void add_oplock_timeout_handler(files_struct *fsp)
708 {
709 struct smbd_server_connection *sconn = fsp->conn->sconn;
710 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
711
712 /*
713 * If kernel oplocks already notifies smbds when an oplock break times
714 * out, just return.
715 */
716 if (koplocks &&
717 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
718 return;
719 }
720
721 if (fsp->oplock_timeout != NULL) {
722 DEBUG(0, ("Logic problem -- have an oplock event hanging "
723 "around\n"));
724 }
725
726 fsp->oplock_timeout =
727 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
728 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
729 oplock_timeout_handler, fsp);
730
731 if (fsp->oplock_timeout == NULL) {
732 DEBUG(0, ("Could not add oplock timeout handler\n"));
733 }
734 }
735
736 static void send_break_message_smb1(files_struct *fsp, int level)
737 {
738 struct smbXsrv_connection *xconn = NULL;
739 char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
740
741 /*
742 * For SMB1 we only have one connection
743 */
744 xconn = fsp->conn->sconn->client->connections;
745
746 new_break_message_smb1(fsp, level, break_msg);
747
748 show_msg(break_msg);
749 if (!srv_send_smb(xconn,
750 break_msg, false, 0,
751 IS_CONN_ENCRYPTED(fsp->conn),
752 NULL)) {
753 exit_server_cleanly("send_break_message_smb1: "
754 "srv_send_smb failed.");
755 }
756 }
757
758 /*******************************************************************
759 This handles the generic oplock break message from another smbd.
760 *******************************************************************/
761
762 static void process_oplock_break_message(struct messaging_context *msg_ctx,
763 void *private_data,
764 uint32_t msg_type,
765 struct server_id src,
766 DATA_BLOB *data)
767 {
768 struct share_mode_entry msg;
769 files_struct *fsp;
770 bool use_kernel;
771 struct smbd_server_connection *sconn =
772 talloc_get_type_abort(private_data,
773 struct smbd_server_connection);
774 struct server_id self = messaging_server_id(sconn->msg_ctx);
775 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
776 uint16_t break_from;
777 uint16_t break_to;
778 bool break_needed = true;
779 struct server_id_buf tmp;
780
781 if (data->data == NULL) {
782 DEBUG(0, ("Got NULL buffer\n"));
783 return;
784 }
785
786 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
787 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
788 return;
789 }
790
791 /* De-linearize incoming message. */
792 message_to_share_mode_entry(&msg, (char *)data->data);
793 break_to = msg.op_type;
794
795 DEBUG(10, ("Got oplock break to %u message from pid %s: %s/%llu\n",
796 (unsigned)break_to, server_id_str_buf(src, &tmp),
797 file_id_string_tos(&msg.id),
798 (unsigned long long)msg.share_file_id));
799
800 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
801
802 if (fsp == NULL) {
803 /* We hit a race here. Break messages are sent, and before we
804 * get to process this message, we have closed the file. */
805 DEBUG(3, ("Did not find fsp\n"));
806 return;
807 }
808
809 break_from = fsp_lease_type(fsp);
810
811 if (fsp->oplock_type != LEASE_OPLOCK) {
812 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
813 /*
814 * Nothing to do anymore
815 */
816 DEBUG(10, ("fsp->sent_oplock_break = %d\n",
817 fsp->sent_oplock_break));
818 return;
819 }
820 }
821
822 if (!(global_client_caps & CAP_LEVEL_II_OPLOCKS)) {
823 DEBUG(10, ("client_caps without level2 oplocks\n"));
824 break_to &= ~SMB2_LEASE_READ;
825 }
826
827 use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
828 if (use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
829 DEBUG(10, ("Kernel oplocks don't allow level2\n"));
830 break_to &= ~SMB2_LEASE_READ;
831 }
832
833 if (!lp_level2_oplocks(SNUM(fsp->conn))) {
834 DEBUG(10, ("no level2 oplocks by config\n"));
835 break_to &= ~SMB2_LEASE_READ;
836 }
837
838 if (fsp->oplock_type == LEASE_OPLOCK) {
839 struct share_mode_lock *lck;
840 int idx;
841
842 lck = get_existing_share_mode_lock(
843 talloc_tos(), fsp->file_id);
844 if (lck == NULL) {
845 /*
846 * We hit a race here. Break messages are sent, and
847 * before we get to process this message, we have closed
848 * the file.
849 */
850 DEBUG(3, ("Did not find share_mode\n"));
851 return;
852 }
853
854 idx = find_share_mode_lease(
855 lck->data,
856 fsp_client_guid(fsp),
857 &fsp->lease->lease.lease_key);
858 if (idx != -1) {
859 struct share_mode_lease *l;
860 l = &lck->data->leases[idx];
861
862 break_from = l->current_state;
863 break_to &= l->current_state;
864
865 if (l->breaking) {
866 break_to &= l->breaking_to_required;
867 if (l->breaking_to_required != break_to) {
868 /*
869 * Note we don't increment the epoch
870 * here, which might be a bug in
871 * Windows too...
872 */
873 l->breaking_to_required = break_to;
874 lck->data->modified = true;
875 }
876 break_needed = false;
877 } else if (l->current_state == break_to) {
878 break_needed = false;
879 } else if (l->current_state == SMB2_LEASE_READ) {
880 l->current_state = SMB2_LEASE_NONE;
881 /* Need to increment the epoch */
882 l->epoch += 1;
883 lck->data->modified = true;
884 } else {
885 l->breaking = true;
886 l->breaking_to_required = break_to;
887 l->breaking_to_requested = break_to;
888 /* Need to increment the epoch */
889 l->epoch += 1;
890 lck->data->modified = true;
891 }
892
893 /* Ensure we're in sync with current lease state. */
894 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
895 }
896
897 TALLOC_FREE(lck);
898 }
899
900 if (!break_needed) {
901 DEBUG(10,("%s: skip break\n", __func__));
902 return;
903 }
904
905 if ((break_from == SMB2_LEASE_NONE) && !break_needed) {
906 DEBUG(3, ("Already downgraded oplock to none on %s: %s\n",
907 file_id_string_tos(&fsp->file_id),
908 fsp_str_dbg(fsp)));
909 return;
910 }
911
912 DEBUG(10, ("break_from=%u, break_to=%u\n",
913 (unsigned)break_from, (unsigned)break_to));
914
915 if ((break_from == break_to) && !break_needed) {
916 DEBUG(3, ("Already downgraded oplock to %u on %s: %s\n",
917 (unsigned)break_to,
918 file_id_string_tos(&fsp->file_id),
919 fsp_str_dbg(fsp)));
920 return;
921 }
922
923 /* Need to wait before sending a break
924 message if we sent ourselves this message. */
925 if (serverid_equal(&self, &src)) {
926 wait_before_sending_break();
927 }
928
929 if (sconn->using_smb2) {
930 send_break_message_smb2(fsp, break_from, break_to);
931 } else {
932 send_break_message_smb1(fsp, (break_to & SMB2_LEASE_READ) ?
933 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
934 }
935
936 if ((break_from == SMB2_LEASE_READ) &&
937 (break_to == SMB2_LEASE_NONE)) {
938 /*
939 * This is an async break without a reply and thus no timeout
940 *
941 * leases are handled above.
942 */
943 if (fsp->oplock_type != LEASE_OPLOCK) {
944 remove_oplock(fsp);
945 }
946 return;
947 }
948 if (fsp->oplock_type == LEASE_OPLOCK) {
949 return;
950 }
951
952 fsp->sent_oplock_break = (break_to & SMB2_LEASE_READ) ?
953 LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
954
955 add_oplock_timeout_handler(fsp);
956 }
957
958 /*******************************************************************
959 This handles the kernel oplock break message.
960 *******************************************************************/
961
962 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
963 void *private_data,
964 uint32_t msg_type,
965 struct server_id src,
966 DATA_BLOB *data)
967 {
968 struct file_id id;
969 unsigned long file_id;
970 files_struct *fsp;
971 struct smbd_server_connection *sconn =
972 talloc_get_type_abort(private_data,
973 struct smbd_server_connection);
974 struct server_id_buf tmp;
975
976 if (data->data == NULL) {
977 DEBUG(0, ("Got NULL buffer\n"));
978 return;
979 }
980
981 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
982 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
983 return;
984 }
985
986 /* Pull the data from the message. */
987 pull_file_id_24((char *)data->data, &id);
988 file_id = (unsigned long)IVAL(data->data, 24);
989
990 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
991 server_id_str_buf(src, &tmp), file_id_string_tos(&id),
992 (unsigned int)file_id));
993
994 fsp = initial_break_processing(sconn, id, file_id);
995
996 if (fsp == NULL) {
997 DEBUG(3, ("Got a kernel oplock break message for a file "
998 "I don't know about\n"));
999 return;
1000 }
1001
1002 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
1003 /* This is ok, kernel oplocks come in completely async */
1004 DEBUG(3, ("Got a kernel oplock request while waiting for a "
1005 "break reply\n"));
1006 return;
1007 }
1008
1009 if (sconn->using_smb2) {
1010 send_break_message_smb2(fsp, 0, OPLOCKLEVEL_NONE);
1011 } else {
1012 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
1013 }
1014
1015 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
1016
1017 add_oplock_timeout_handler(fsp);
1018 }
1019
1020 struct break_to_none_state {
1021 struct smbd_server_connection *sconn;
1022 struct file_id id;
1023 struct smb2_lease_key lease_key;
1024 struct GUID client_guid;
1025 };
1026 static void do_break_to_none(struct tevent_context *ctx,
1027 struct tevent_immediate *im,
1028 void *private_data);
1029
1030 /****************************************************************************
1031 This function is called on any file modification or lock request. If a file
1032 is level 2 oplocked then it must tell all other level 2 holders to break to
1033 none.
1034 ****************************************************************************/
1035
1036 static void contend_level2_oplocks_begin_default(files_struct *fsp,
1037 enum level2_contention_type type)
1038 {
1039 struct smbd_server_connection *sconn = fsp->conn->sconn;
1040 struct tevent_immediate *im;
1041 struct break_to_none_state *state;
1042 struct byte_range_lock *brl;
1043 uint32_t num_read_oplocks = 0;
1044
1045 /*
1046 * If this file is level II oplocked then we need
1047 * to grab the shared memory lock and inform all
1048 * other files with a level II lock that they need
1049 * to flush their read caches. We keep the lock over
1050 * the shared memory area whilst doing this.
1051 */
1052
1053 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
1054 /*
1055 * There can't be any level2 oplocks, we're alone.
1056 */
1057 return;
1058 }
1059
1060 brl = brl_get_locks_readonly(fsp);
1061 if (brl != NULL) {
1062 num_read_oplocks = brl_num_read_oplocks(brl);
1063 }
1064
1065 DEBUG(10, ("num_read_oplocks = %"PRIu32"\n", num_read_oplocks));
1066
1067 if (num_read_oplocks == 0) {
1068 DEBUG(10, ("No read oplocks around\n"));
1069 return;
1070 }
1071
1072 /*
1073 * When we get here we might have a brlock entry locked. Also
1074 * locking the share mode entry would violate the locking
1075 * order. Breaking level2 oplocks to none is asynchronous
1076 * anyway, so we postpone this into an immediate event.
1077 */
1078
1079 state = talloc_zero(sconn, struct break_to_none_state);
1080 if (state == NULL) {
1081 DEBUG(1, ("talloc failed\n"));
1082 return;
1083 }
1084 state->sconn = sconn;
1085 state->id = fsp->file_id;
1086
1087 if (fsp->oplock_type == LEASE_OPLOCK) {
1088 state->client_guid = *fsp_client_guid(fsp);
1089 state->lease_key = fsp->lease->lease.lease_key;
1090 DEBUG(10, ("Breaking through lease key %"PRIu64"/%"PRIu64"\n",
1091 state->lease_key.data[0],
1092 state->lease_key.data[1]));
1093 }
1094
1095 im = tevent_create_immediate(state);
1096 if (im == NULL) {
1097 DEBUG(1, ("tevent_create_immediate failed\n"));
1098 TALLOC_FREE(state);
1099 return;
1100 }
1101 tevent_schedule_immediate(im, sconn->ev_ctx, do_break_to_none, state);
1102 }
1103
1104 static void send_break_to_none(struct messaging_context *msg_ctx,
1105 const struct share_mode_entry *e)
1106 {
1107 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1108
1109 share_mode_entry_to_message(msg, e);
1110 /* Overload entry->op_type */
1111 SSVAL(msg, OP_BREAK_MSG_OP_TYPE_OFFSET, NO_OPLOCK);
1112
1113 messaging_send_buf(msg_ctx, e->pid, MSG_SMB_BREAK_REQUEST,
1114 (uint8_t *)msg, sizeof(msg));
1115 }
1116
1117 static void do_break_to_none(struct tevent_context *ctx,
1118 struct tevent_immediate *im,
1119 void *private_data)
1120 {
1121 struct break_to_none_state *state = talloc_get_type_abort(
1122 private_data, struct break_to_none_state);
1123 uint32_t i;
1124 struct share_mode_lock *lck;
1125 struct share_mode_data *d;
1126
1127 lck = get_existing_share_mode_lock(talloc_tos(), state->id);
1128 if (lck == NULL) {
1129 DEBUG(1, ("%s: failed to lock share mode entry for file %s.\n",
1130 __func__, file_id_string_tos(&state->id)));
1131 goto done;
1132 }
1133 d = lck->data;
1134
1135 /*
1136 * Walk leases and oplocks separately: We have to send one break per
1137 * lease. If we have multiple share_mode_entry having a common lease,
1138 * we would break the lease twice if we don't walk the leases list
1139 * separately.
1140 */
1141
1142 for (i=0; i<d->num_leases; i++) {
1143 struct share_mode_lease *l = &d->leases[i];
1144 struct share_mode_entry *e;
1145 uint32_t j;
1146
1147 if ((l->current_state & SMB2_LEASE_READ) == 0) {
1148 continue;
1149 }
1150 if (smb2_lease_equal(&state->client_guid,
1151 &state->lease_key,
1152 &l->client_guid,
1153 &l->lease_key)) {
1154 DEBUG(10, ("Don't break our own lease\n"));
1155 continue;
1156 }
1157
1158 for (j=0; j<d->num_share_modes; j++) {
1159 e = &d->share_modes[j];
1160
1161 if (!is_valid_share_mode_entry(e)) {
1162 continue;
1163 }
1164 if (e->lease_idx == i) {
1165 break;
1166 }
1167 }
1168 if (j == d->num_share_modes) {
1169 DEBUG(0, ("leases[%"PRIu32"] has no share mode\n",
1170 i));
1171 continue;
1172 }
1173
1174 DEBUG(10, ("Breaking lease# %"PRIu32" with share_entry# "
1175 "%"PRIu32"\n", i, j));
1176
1177 send_break_to_none(state->sconn->msg_ctx, e);
1178 }
1179
1180 for(i = 0; i < d->num_share_modes; i++) {
1181 struct share_mode_entry *e = &d->share_modes[i];
1182
1183 if (!is_valid_share_mode_entry(e)) {
1184 continue;
1185 }
1186 if (e->op_type == LEASE_OPLOCK) {
1187 /*
1188 * Took care of those in the loop above
1189 */
1190 continue;
1191 }
1192
1193 /*
1194 * As there could have been multiple writes waiting at the
1195 * lock_share_entry gate we may not be the first to
1196 * enter. Hence the state of the op_types in the share mode
1197 * entries may be partly NO_OPLOCK and partly LEVEL_II
1198 * oplock. It will do no harm to re-send break messages to
1199 * those smbd's that are still waiting their turn to remove
1200 * their LEVEL_II state, and also no harm to ignore existing
1201 * NO_OPLOCK states. JRA.
1202 */
1203
1204 DEBUG(10, ("%s: share_entry[%i]->op_type == %d\n", __func__,
1205 i, e->op_type ));
1206
1207 if (e->op_type == NO_OPLOCK) {
1208 continue;
1209 }
1210
1211 /* Paranoia .... */
1212 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1213 DEBUG(0,("%s: PANIC. "
1214 "share mode entry %d is an exclusive "
1215 "oplock !\n", __func__, i ));
1216 TALLOC_FREE(lck);
1217 abort();
1218 }
1219
1220 send_break_to_none(state->sconn->msg_ctx, e);
1221 }
1222
1223 /* We let the message receivers handle removing the oplock state
1224 in the share mode lock db. */
1225
1226 TALLOC_FREE(lck);
1227 done:
1228 TALLOC_FREE(state);
1229 return;
1230 }
1231
1232 void smbd_contend_level2_oplocks_begin(files_struct *fsp,
1233 enum level2_contention_type type)
1234 {
1235 struct smbd_server_connection *sconn = fsp->conn->sconn;
1236 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1237
1238 if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
1239 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
1240 return;
1241 }
1242
1243 contend_level2_oplocks_begin_default(fsp, type);
1244 }
1245
1246 void smbd_contend_level2_oplocks_end(files_struct *fsp,
1247 enum level2_contention_type type)
1248 {
1249 struct smbd_server_connection *sconn = fsp->conn->sconn;
1250 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1251
1252 /* Only kernel oplocks implement this so far */
1253 if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
1254 koplocks->ops->contend_level2_oplocks_end(fsp, type);
1255 }
1256 }
1257
1258 /****************************************************************************
1259 Linearize a share mode entry struct to an internal oplock break message.
1260 ****************************************************************************/
1261
1262 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
1263 {
1264 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32_t)e->pid.pid);
1265 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
1266 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
1267 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
1268 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
1269 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
1270 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
1271 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
1272 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1273 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
1274 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
1275 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
1276 SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
1277 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
1278 }
1279
1280 /****************************************************************************
1281 De-linearize an internal oplock break message to a share mode entry struct.
1282 ****************************************************************************/
1283
1284 void message_to_share_mode_entry(struct share_mode_entry *e, const char *msg)
1285 {
1286 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
1287 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
1288 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
1289 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
1290 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
1291 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
1292 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
1293 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
1294 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1295 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
1296 e->uid = (uint32_t)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
1297 e->flags = (uint16_t)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
1298 e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
1299 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
1300 }
1301
1302 /****************************************************************************
1303 Setup oplocks for this process.
1304 ****************************************************************************/
1305
1306 bool init_oplocks(struct smbd_server_connection *sconn)
1307 {
1308 DEBUG(3,("init_oplocks: initializing messages.\n"));
1309
1310 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
1311 process_oplock_break_message);
1312 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
1313 process_kernel_oplock_break);
1314 return true;
1315 }
1316
1317 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1318 {
1319 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1320
1321 /* only initialize once */
1322 if (koplocks == NULL) {
1323 #if HAVE_KERNEL_OPLOCKS_IRIX
1324 koplocks = irix_init_kernel_oplocks(sconn);
1325 #elif HAVE_KERNEL_OPLOCKS_LINUX
1326 koplocks = linux_init_kernel_oplocks(sconn);
1327 #endif
1328 sconn->oplocks.kernel_ops = koplocks;
1329 }
1330 }
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