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s3: libsmb: Do some hardening in the receive processing of cli_shadow_copy_data_recv().
[Samba.git] / source3 / smbd / oplock.c
blobff87d9ea4498327be2cfc921a8bda596b0cfeed3
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 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
100
101 if ((fsp->oplock_type != NO_OPLOCK) &&
102 use_kernel) {
103 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
104 }
105
106 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
107 sconn->oplocks.level_II_open--;
108 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
109 sconn->oplocks.exclusive_open--;
110 }
111
112 SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
113 SMB_ASSERT(sconn->oplocks.level_II_open>=0);
114
115 fsp->oplock_type = NO_OPLOCK;
116 fsp->sent_oplock_break = NO_BREAK_SENT;
117
118 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
119 delete_write_cache(fsp);
120
121 TALLOC_FREE(fsp->oplock_timeout);
122 }
123
124 /****************************************************************************
125 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
126 ****************************************************************************/
127
128 static void downgrade_file_oplock(files_struct *fsp)
129 {
130 struct smbd_server_connection *sconn = fsp->conn->sconn;
131 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
132
133 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
134 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
135 return;
136 }
137
138 if (koplocks) {
139 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
140 }
141 fsp->oplock_type = LEVEL_II_OPLOCK;
142 sconn->oplocks.exclusive_open--;
143 sconn->oplocks.level_II_open++;
144 fsp->sent_oplock_break = NO_BREAK_SENT;
145
146 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
147 delete_write_cache(fsp);
148
149 TALLOC_FREE(fsp->oplock_timeout);
150 }
151
152 uint32_t map_oplock_to_lease_type(uint16_t op_type)
153 {
154 uint32_t ret;
155
156 switch(op_type) {
157 case BATCH_OPLOCK:
158 case BATCH_OPLOCK|EXCLUSIVE_OPLOCK:
159 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE;
160 break;
161 case EXCLUSIVE_OPLOCK:
162 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE;
163 break;
164 case LEVEL_II_OPLOCK:
165 ret = SMB2_LEASE_READ;
166 break;
167 default:
168 ret = SMB2_LEASE_NONE;
169 break;
170 }
171 return ret;
172 }
173
174 uint32_t get_lease_type(struct share_mode_data *d, struct share_mode_entry *e)
175 {
176 if (e->op_type == LEASE_OPLOCK) {
177 return d->leases[e->lease_idx].current_state;
178 }
179 return map_oplock_to_lease_type(e->op_type);
180 }
181
182 bool update_num_read_oplocks(files_struct *fsp, struct share_mode_lock *lck)
183 {
184 struct share_mode_data *d = lck->data;
185 struct byte_range_lock *br_lck;
186 uint32_t num_read_oplocks = 0;
187 uint32_t i;
188
189 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
190 /*
191 * If we're the only one, we don't need a brlock entry
192 */
193 remove_stale_share_mode_entries(d);
194 SMB_ASSERT(d->num_share_modes == 1);
195 SMB_ASSERT(EXCLUSIVE_OPLOCK_TYPE(d->share_modes[0].op_type));
196 return true;
197 }
198
199 for (i=0; i<d->num_share_modes; i++) {
200 struct share_mode_entry *e = &d->share_modes[i];
201 uint32_t e_lease_type = get_lease_type(d, e);
202
203 if (e_lease_type & SMB2_LEASE_READ) {
204 num_read_oplocks += 1;
205 }
206 }
207
208 br_lck = brl_get_locks_readonly(fsp);
209 if (br_lck == NULL) {
210 return false;
211 }
212 if (brl_num_read_oplocks(br_lck) == num_read_oplocks) {
213 return true;
214 }
215
216 br_lck = brl_get_locks(talloc_tos(), fsp);
217 if (br_lck == NULL) {
218 return false;
219 }
220 brl_set_num_read_oplocks(br_lck, num_read_oplocks);
221 TALLOC_FREE(br_lck);
222 return true;
223 }
224
225 /****************************************************************************
226 Remove a file oplock with lock already held. Copes with level II and exclusive.
227 ****************************************************************************/
228
229 bool remove_oplock_under_lock(files_struct *fsp, struct share_mode_lock *lck)
230 {
231 bool ret;
232
233 ret = remove_share_oplock(lck, fsp);
234 if (!ret) {
235 DBG_ERR("failed to remove share oplock for "
236 "file %s, %s, %s\n",
237 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
238 file_id_string_tos(&fsp->file_id));
239 }
240 release_file_oplock(fsp);
241
242 ret = update_num_read_oplocks(fsp, lck);
243 if (!ret) {
244 DBG_ERR("update_num_read_oplocks failed for "
245 "file %s, %s, %s\n",
246 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
247 file_id_string_tos(&fsp->file_id));
248 }
249
250 return ret;
251 }
252
253 /****************************************************************************
254 Remove a file oplock. Copes with level II and exclusive.
255 Locks then unlocks the share mode lock. Client can decide to go directly
256 to none even if a "break-to-level II" was sent.
257 ****************************************************************************/
258
259 bool remove_oplock(files_struct *fsp)
260 {
261 bool ret;
262 struct share_mode_lock *lck;
263
264 DBG_DEBUG("remove_oplock called for %s\n", fsp_str_dbg(fsp));
265
266 /* Remove the oplock flag from the sharemode. */
267 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
268 if (lck == NULL) {
269 DBG_ERR("failed to lock share entry for "
270 "file %s\n", fsp_str_dbg(fsp));
271 return false;
272 }
273
274 ret = remove_oplock_under_lock(fsp, lck);
275
276 TALLOC_FREE(lck);
277 return ret;
278 }
279
280 /*
281 * Deal with a reply when a break-to-level II was sent.
282 */
283 bool downgrade_oplock(files_struct *fsp)
284 {
285 bool ret;
286 struct share_mode_lock *lck;
287
288 DEBUG(10, ("downgrade_oplock called for %s\n",
289 fsp_str_dbg(fsp)));
290
291 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
292 if (lck == NULL) {
293 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
294 "file %s\n", fsp_str_dbg(fsp)));
295 return False;
296 }
297 ret = downgrade_share_oplock(lck, fsp);
298 if (!ret) {
299 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
300 "for file %s, %s, file_id %s\n",
301 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
302 file_id_string_tos(&fsp->file_id)));
303 }
304 downgrade_file_oplock(fsp);
305
306 ret = update_num_read_oplocks(fsp, lck);
307 if (!ret) {
308 DEBUG(0, ("%s: update_num_read_oplocks failed for "
309 "file %s, %s, %s\n",
310 __func__, fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
311 file_id_string_tos(&fsp->file_id)));
312 }
313
314 TALLOC_FREE(lck);
315 return ret;
316 }
317
318 static void lease_timeout_handler(struct tevent_context *ctx,
319 struct tevent_timer *te,
320 struct timeval now,
321 void *private_data)
322 {
323 struct fsp_lease *lease =
324 talloc_get_type_abort(private_data,
325 struct fsp_lease);
326 struct files_struct *fsp;
327 struct share_mode_lock *lck;
328 uint16_t old_epoch = lease->lease.lease_epoch;
329
330 fsp = file_find_one_fsp_from_lease_key(lease->sconn,
331 &lease->lease.lease_key);
332 if (fsp == NULL) {
333 /* race? */
334 TALLOC_FREE(lease->timeout);
335 return;
336 }
337
338 lck = get_existing_share_mode_lock(
339 talloc_tos(), fsp->file_id);
340 if (lck == NULL) {
341 /* race? */
342 TALLOC_FREE(lease->timeout);
343 return;
344 }
345
346 fsp_lease_update(lck, fsp_client_guid(fsp), lease);
347
348 if (lease->lease.lease_epoch != old_epoch) {
349 /*
350 * If the epoch changed we need to wait for
351 * the next timeout to happen.
352 */
353 DEBUG(10, ("lease break timeout race (epoch) for file %s - ignoring\n",
354 fsp_str_dbg(fsp)));
355 TALLOC_FREE(lck);
356 return;
357 }
358
359 if (!(lease->lease.lease_flags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)) {
360 /*
361 * If the epoch changed we need to wait for
362 * the next timeout to happen.
363 */
364 DEBUG(10, ("lease break timeout race (flags) for file %s - ignoring\n",
365 fsp_str_dbg(fsp)));
366 TALLOC_FREE(lck);
367 return;
368 }
369
370 DEBUG(1, ("lease break timed out for file %s -- replying anyway\n",
371 fsp_str_dbg(fsp)));
372 (void)downgrade_lease(lease->sconn->client->connections,
373 1,
374 &fsp->file_id,
375 &lease->lease.lease_key,
376 SMB2_LEASE_NONE);
377
378 TALLOC_FREE(lck);
379 }
380
381 bool fsp_lease_update(struct share_mode_lock *lck,
382 const struct GUID *client_guid,
383 struct fsp_lease *lease)
384 {
385 struct share_mode_data *d = lck->data;
386 int idx;
387 struct share_mode_lease *l = NULL;
388
389 idx = find_share_mode_lease(d, client_guid, &lease->lease.lease_key);
390 if (idx != -1) {
391 l = &d->leases[idx];
392 }
393
394 if (l == NULL) {
395 DEBUG(1, ("%s: Could not find lease entry\n", __func__));
396 TALLOC_FREE(lease->timeout);
397 lease->lease.lease_state = SMB2_LEASE_NONE;
398 lease->lease.lease_epoch += 1;
399 lease->lease.lease_flags = 0;
400 return false;
401 }
402
403 DEBUG(10,("%s: refresh lease state\n", __func__));
404
405 /* Ensure we're in sync with current lease state. */
406 if (lease->lease.lease_epoch != l->epoch) {
407 DEBUG(10,("%s: cancel outdated timeout\n", __func__));
408 TALLOC_FREE(lease->timeout);
409 }
410 lease->lease.lease_epoch = l->epoch;
411 lease->lease.lease_state = l->current_state;
412
413 if (l->breaking) {
414 lease->lease.lease_flags |= SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
415
416 if (lease->timeout == NULL) {
417 struct timeval t = timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0);
418
419 DEBUG(10,("%s: setup timeout handler\n", __func__));
420
421 lease->timeout = tevent_add_timer(lease->sconn->ev_ctx,
422 lease, t,
423 lease_timeout_handler,
424 lease);
425 if (lease->timeout == NULL) {
426 DEBUG(0, ("%s: Could not add lease timeout handler\n",
427 __func__));
428 }
429 }
430 } else {
431 lease->lease.lease_flags &= ~SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
432 TALLOC_FREE(lease->timeout);
433 }
434
435 return true;
436 }
437
438 struct downgrade_lease_additional_state {
439 struct tevent_immediate *im;
440 struct smbXsrv_connection *xconn;
441 uint32_t break_flags;
442 struct smb2_lease_key lease_key;
443 uint32_t break_from;
444 uint32_t break_to;
445 uint16_t new_epoch;
446 };
447
448 static void downgrade_lease_additional_trigger(struct tevent_context *ev,
449 struct tevent_immediate *im,
450 void *private_data)
451 {
452 struct downgrade_lease_additional_state *state =
453 talloc_get_type_abort(private_data,
454 struct downgrade_lease_additional_state);
455 struct smbXsrv_connection *xconn = state->xconn;
456 NTSTATUS status;
457
458 status = smbd_smb2_send_lease_break(xconn,
459 state->new_epoch,
460 state->break_flags,
461 &state->lease_key,
462 state->break_from,
463 state->break_to);
464 TALLOC_FREE(state);
465 if (!NT_STATUS_IS_OK(status)) {
466 smbd_server_connection_terminate(xconn,
467 nt_errstr(status));
468 return;
469 }
470 }
471
472 struct downgrade_lease_fsps_state {
473 struct file_id id;
474 struct share_mode_lock *lck;
475 const struct smb2_lease_key *key;
476 };
477
478 static struct files_struct *downgrade_lease_fsps(struct files_struct *fsp,
479 void *private_data)
480 {
481 struct downgrade_lease_fsps_state *state =
482 (struct downgrade_lease_fsps_state *)private_data;
483
484 if (fsp->oplock_type != LEASE_OPLOCK) {
485 return NULL;
486 }
487 if (!smb2_lease_key_equal(&fsp->lease->lease.lease_key, state->key)) {
488 return NULL;
489 }
490 if (!file_id_equal(&fsp->file_id, &state->id)) {
491 return NULL;
492 }
493
494 fsp_lease_update(state->lck, fsp_client_guid(fsp), fsp->lease);
495
496 return NULL;
497 }
498
499 NTSTATUS downgrade_lease(struct smbXsrv_connection *xconn,
500 uint32_t num_file_ids,
501 const struct file_id *ids,
502 const struct smb2_lease_key *key,
503 uint32_t lease_state)
504 {
505 struct smbd_server_connection *sconn = xconn->client->sconn;
506 struct share_mode_lock *lck;
507 struct share_mode_lease *l = NULL;
508 const struct file_id id = ids[0];
509 uint32_t i;
510 NTSTATUS status;
511
512 DEBUG(10, ("%s: Downgrading %s to %x\n", __func__,
513 file_id_string_tos(&id), (unsigned)lease_state));
514
515 lck = get_existing_share_mode_lock(talloc_tos(), id);
516 if (lck == NULL) {
517 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
518 }
519 status = downgrade_share_lease(sconn, lck, key, lease_state, &l);
520
521 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
522 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
523
524 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
525 struct downgrade_lease_additional_state *state;
526
527 state = talloc_zero(xconn,
528 struct downgrade_lease_additional_state);
529 if (state == NULL) {
530 TALLOC_FREE(lck);
531 return NT_STATUS_NO_MEMORY;
532 }
533
534 state->im = tevent_create_immediate(state);
535 if (state->im == NULL) {
536 TALLOC_FREE(state);
537 TALLOC_FREE(lck);
538 return NT_STATUS_NO_MEMORY;
539 }
540
541 state->xconn = xconn;
542 if (l->current_state & (~SMB2_LEASE_READ)) {
543 state->break_flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
544 }
545 state->lease_key = l->lease_key;
546 state->break_from = l->current_state;
547 state->break_to = l->breaking_to_requested;
548 if (l->lease_version > 1) {
549 state->new_epoch = l->epoch;
550 }
551
552 if (state->break_flags == 0) {
553 /*
554 * This is an async break without
555 * SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED
556 *
557 * we need to store NONE state in the
558 * database.
559 */
560 l->current_state = 0;
561 l->breaking_to_requested = 0;
562 l->breaking_to_required = 0;
563 l->breaking = false;
564
565 lck->data->modified = true;
566 }
567
568 tevent_schedule_immediate(state->im, xconn->ev_ctx,
569 downgrade_lease_additional_trigger,
570 state);
571 }
572
573 {
574 struct downgrade_lease_fsps_state state = {
575 .id = id, .lck = lck, .key = key,
576 };
577
578 files_forall(sconn, downgrade_lease_fsps, &state);
579 }
580
581 TALLOC_FREE(lck);
582 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
583 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
584
585 /*
586 * Dynamic share case. Ensure other opens are copies.
587 * This will only be breaking to NONE.
588 */
589
590 for (i = 1; i < num_file_ids; i++) {
591 lck = get_existing_share_mode_lock(talloc_tos(), ids[i]);
592 if (lck == NULL) {
593 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
594 }
595
596 {
597 struct downgrade_lease_fsps_state state = {
598 .id = ids[i], .lck = lck, .key = key,
599 };
600
601 files_forall(sconn, downgrade_lease_fsps, &state);
602 }
603
604 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
605 file_id_string_tos(&ids[i]), (unsigned)lease_state, nt_errstr(status)));
606
607 TALLOC_FREE(lck);
608 }
609
610 return status;
611 }
612
613 /****************************************************************************
614 Set up an oplock break message.
615 ****************************************************************************/
616
617 #define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
618
619 static void new_break_message_smb1(files_struct *fsp, int cmd,
620 char result[SMB1_BREAK_MESSAGE_LENGTH])
621 {
622 memset(result,'\0',smb_size);
623 srv_set_message(result,8,0,true);
624 SCVAL(result,smb_com,SMBlockingX);
625 SSVAL(result,smb_tid,fsp->conn->cnum);
626 SSVAL(result,smb_pid,0xFFFF);
627 SSVAL(result,smb_uid,0);
628 SSVAL(result,smb_mid,0xFFFF);
629 SCVAL(result,smb_vwv0,0xFF);
630 SSVAL(result,smb_vwv2,fsp->fnum);
631 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
632 SCVAL(result,smb_vwv3+1,cmd);
633 }
634
635 /****************************************************************************
636 Function to do the waiting before sending a local break.
637 ****************************************************************************/
638
639 static void wait_before_sending_break(void)
640 {
641 long wait_time = (long)lp_oplock_break_wait_time();
642
643 if (wait_time) {
644 smb_msleep(wait_time);
645 }
646 }
647
648 /****************************************************************************
649 Ensure that we have a valid oplock.
650 ****************************************************************************/
651
652 static files_struct *initial_break_processing(
653 struct smbd_server_connection *sconn, struct file_id id,
654 unsigned long file_id)
655 {
656 files_struct *fsp = NULL;
657
658 DEBUG(3, ("initial_break_processing: called for %s/%u\n"
659 "Current oplocks_open (exclusive = %d, levelII = %d)\n",
660 file_id_string_tos(&id), (int)file_id,
661 sconn->oplocks.exclusive_open,
662 sconn->oplocks.level_II_open));
663
664 /*
665 * We need to search the file open table for the
666 * entry containing this dev and inode, and ensure
667 * we have an oplock on it.
668 */
669
670 fsp = file_find_dif(sconn, id, file_id);
671
672 if(fsp == NULL) {
673 /* The file could have been closed in the meantime - return success. */
674 DEBUG(3, ("initial_break_processing: cannot find open file "
675 "with file_id %s gen_id = %lu, allowing break to "
676 "succeed.\n", file_id_string_tos(&id), file_id));
677 return NULL;
678 }
679
680 /* Ensure we have an oplock on the file */
681
682 /*
683 * There is a potential race condition in that an oplock could
684 * have been broken due to another udp request, and yet there are
685 * still oplock break messages being sent in the udp message
686 * queue for this file. So return true if we don't have an oplock,
687 * as we may have just freed it.
688 */
689
690 if(fsp->oplock_type == NO_OPLOCK) {
691 DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
692 "gen_id = %lu) has no oplock. Allowing break to "
693 "succeed regardless.\n", fsp_str_dbg(fsp),
694 file_id_string_tos(&id), fsp->fh->gen_id));
695 return NULL;
696 }
697
698 return fsp;
699 }
700
701 static void oplock_timeout_handler(struct tevent_context *ctx,
702 struct tevent_timer *te,
703 struct timeval now,
704 void *private_data)
705 {
706 files_struct *fsp = (files_struct *)private_data;
707
708 SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
709
710 /* Remove the timed event handler. */
711 TALLOC_FREE(fsp->oplock_timeout);
712 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
713 fsp_str_dbg(fsp)));
714 remove_oplock(fsp);
715 }
716
717 /*******************************************************************
718 Add a timeout handler waiting for the client reply.
719 *******************************************************************/
720
721 static void add_oplock_timeout_handler(files_struct *fsp)
722 {
723 struct smbd_server_connection *sconn = fsp->conn->sconn;
724 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
725
726 /*
727 * If kernel oplocks already notifies smbds when an oplock break times
728 * out, just return.
729 */
730 if (koplocks &&
731 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
732 return;
733 }
734
735 if (fsp->oplock_timeout != NULL) {
736 DEBUG(0, ("Logic problem -- have an oplock event hanging "
737 "around\n"));
738 }
739
740 fsp->oplock_timeout =
741 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
742 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
743 oplock_timeout_handler, fsp);
744
745 if (fsp->oplock_timeout == NULL) {
746 DEBUG(0, ("Could not add oplock timeout handler\n"));
747 }
748 }
749
750 static void send_break_message_smb1(files_struct *fsp, int level)
751 {
752 struct smbXsrv_connection *xconn = NULL;
753 char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
754
755 /*
756 * For SMB1 we only have one connection
757 */
758 xconn = fsp->conn->sconn->client->connections;
759
760 new_break_message_smb1(fsp, level, break_msg);
761
762 show_msg(break_msg);
763 if (!srv_send_smb(xconn,
764 break_msg, false, 0,
765 IS_CONN_ENCRYPTED(fsp->conn),
766 NULL)) {
767 exit_server_cleanly("send_break_message_smb1: "
768 "srv_send_smb failed.");
769 }
770 }
771
772 /*******************************************************************
773 This handles the generic oplock break message from another smbd.
774 *******************************************************************/
775
776 static void process_oplock_break_message(struct messaging_context *msg_ctx,
777 void *private_data,
778 uint32_t msg_type,
779 struct server_id src,
780 DATA_BLOB *data)
781 {
782 struct share_mode_entry msg;
783 files_struct *fsp;
784 bool use_kernel;
785 struct smbd_server_connection *sconn =
786 talloc_get_type_abort(private_data,
787 struct smbd_server_connection);
788 struct server_id self = messaging_server_id(sconn->msg_ctx);
789 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
790 uint16_t break_from;
791 uint16_t break_to;
792 bool break_needed = true;
793 struct server_id_buf tmp;
794
795 if (data->data == NULL) {
796 DEBUG(0, ("Got NULL buffer\n"));
797 return;
798 }
799
800 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
801 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
802 return;
803 }
804
805 /* De-linearize incoming message. */
806 message_to_share_mode_entry(&msg, (char *)data->data);
807 break_to = msg.op_type;
808
809 DEBUG(10, ("Got oplock break to %u message from pid %s: %s/%llu\n",
810 (unsigned)break_to, server_id_str_buf(src, &tmp),
811 file_id_string_tos(&msg.id),
812 (unsigned long long)msg.share_file_id));
813
814 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
815
816 if (fsp == NULL) {
817 /* We hit a race here. Break messages are sent, and before we
818 * get to process this message, we have closed the file. */
819 DEBUG(3, ("Did not find fsp\n"));
820 return;
821 }
822
823 break_from = fsp_lease_type(fsp);
824
825 if (fsp->oplock_type != LEASE_OPLOCK) {
826 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
827 /*
828 * Nothing to do anymore
829 */
830 DEBUG(10, ("fsp->sent_oplock_break = %d\n",
831 fsp->sent_oplock_break));
832 return;
833 }
834 }
835
836 if (!(global_client_caps & CAP_LEVEL_II_OPLOCKS)) {
837 DEBUG(10, ("client_caps without level2 oplocks\n"));
838 break_to &= ~SMB2_LEASE_READ;
839 }
840
841 use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
842 if (use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
843 DEBUG(10, ("Kernel oplocks don't allow level2\n"));
844 break_to &= ~SMB2_LEASE_READ;
845 }
846
847 if (!lp_level2_oplocks(SNUM(fsp->conn))) {
848 DEBUG(10, ("no level2 oplocks by config\n"));
849 break_to &= ~SMB2_LEASE_READ;
850 }
851
852 if (fsp->oplock_type == LEASE_OPLOCK) {
853 struct share_mode_lock *lck;
854 int idx;
855
856 lck = get_existing_share_mode_lock(
857 talloc_tos(), fsp->file_id);
858 if (lck == NULL) {
859 /*
860 * We hit a race here. Break messages are sent, and
861 * before we get to process this message, we have closed
862 * the file.
863 */
864 DEBUG(3, ("Did not find share_mode\n"));
865 return;
866 }
867
868 idx = find_share_mode_lease(
869 lck->data,
870 fsp_client_guid(fsp),
871 &fsp->lease->lease.lease_key);
872 if (idx != -1) {
873 struct share_mode_lease *l;
874 l = &lck->data->leases[idx];
875
876 break_from = l->current_state;
877 break_to &= l->current_state;
878
879 if (l->breaking) {
880 break_to &= l->breaking_to_required;
881 if (l->breaking_to_required != break_to) {
882 /*
883 * Note we don't increment the epoch
884 * here, which might be a bug in
885 * Windows too...
886 */
887 l->breaking_to_required = break_to;
888 lck->data->modified = true;
889 }
890 break_needed = false;
891 } else if (l->current_state == break_to) {
892 break_needed = false;
893 } else if (l->current_state == SMB2_LEASE_READ) {
894 l->current_state = SMB2_LEASE_NONE;
895 /* Need to increment the epoch */
896 l->epoch += 1;
897 lck->data->modified = true;
898 } else {
899 l->breaking = true;
900 l->breaking_to_required = break_to;
901 l->breaking_to_requested = break_to;
902 /* Need to increment the epoch */
903 l->epoch += 1;
904 lck->data->modified = true;
905 }
906
907 /* Ensure we're in sync with current lease state. */
908 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
909 }
910
911 TALLOC_FREE(lck);
912 }
913
914 if (!break_needed) {
915 DEBUG(10,("%s: skip break\n", __func__));
916 return;
917 }
918
919 if ((break_from == SMB2_LEASE_NONE) && !break_needed) {
920 DEBUG(3, ("Already downgraded oplock to none on %s: %s\n",
921 file_id_string_tos(&fsp->file_id),
922 fsp_str_dbg(fsp)));
923 return;
924 }
925
926 DEBUG(10, ("break_from=%u, break_to=%u\n",
927 (unsigned)break_from, (unsigned)break_to));
928
929 if ((break_from == break_to) && !break_needed) {
930 DEBUG(3, ("Already downgraded oplock to %u on %s: %s\n",
931 (unsigned)break_to,
932 file_id_string_tos(&fsp->file_id),
933 fsp_str_dbg(fsp)));
934 return;
935 }
936
937 /* Need to wait before sending a break
938 message if we sent ourselves this message. */
939 if (serverid_equal(&self, &src)) {
940 wait_before_sending_break();
941 }
942
943 if (sconn->using_smb2) {
944 send_break_message_smb2(fsp, break_from, break_to);
945 } else {
946 send_break_message_smb1(fsp, (break_to & SMB2_LEASE_READ) ?
947 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
948 }
949
950 if ((break_from == SMB2_LEASE_READ) &&
951 (break_to == SMB2_LEASE_NONE)) {
952 /*
953 * This is an async break without a reply and thus no timeout
954 *
955 * leases are handled above.
956 */
957 if (fsp->oplock_type != LEASE_OPLOCK) {
958 remove_oplock(fsp);
959 }
960 return;
961 }
962 if (fsp->oplock_type == LEASE_OPLOCK) {
963 return;
964 }
965
966 fsp->sent_oplock_break = (break_to & SMB2_LEASE_READ) ?
967 LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
968
969 add_oplock_timeout_handler(fsp);
970 }
971
972 /*******************************************************************
973 This handles the kernel oplock break message.
974 *******************************************************************/
975
976 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
977 void *private_data,
978 uint32_t msg_type,
979 struct server_id src,
980 DATA_BLOB *data)
981 {
982 struct file_id id;
983 unsigned long file_id;
984 files_struct *fsp;
985 struct smbd_server_connection *sconn =
986 talloc_get_type_abort(private_data,
987 struct smbd_server_connection);
988 struct server_id_buf tmp;
989
990 if (data->data == NULL) {
991 DEBUG(0, ("Got NULL buffer\n"));
992 return;
993 }
994
995 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
996 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
997 return;
998 }
999
1000 /* Pull the data from the message. */
1001 pull_file_id_24((char *)data->data, &id);
1002 file_id = (unsigned long)IVAL(data->data, 24);
1003
1004 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
1005 server_id_str_buf(src, &tmp), file_id_string_tos(&id),
1006 (unsigned int)file_id));
1007
1008 fsp = initial_break_processing(sconn, id, file_id);
1009
1010 if (fsp == NULL) {
1011 DEBUG(3, ("Got a kernel oplock break message for a file "
1012 "I don't know about\n"));
1013 return;
1014 }
1015
1016 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
1017 /* This is ok, kernel oplocks come in completely async */
1018 DEBUG(3, ("Got a kernel oplock request while waiting for a "
1019 "break reply\n"));
1020 return;
1021 }
1022
1023 if (sconn->using_smb2) {
1024 send_break_message_smb2(fsp, 0, OPLOCKLEVEL_NONE);
1025 } else {
1026 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
1027 }
1028
1029 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
1030
1031 add_oplock_timeout_handler(fsp);
1032 }
1033
1034 struct break_to_none_state {
1035 struct smbd_server_connection *sconn;
1036 struct file_id id;
1037 struct smb2_lease_key lease_key;
1038 struct GUID client_guid;
1039 };
1040 static void do_break_to_none(struct tevent_context *ctx,
1041 struct tevent_immediate *im,
1042 void *private_data);
1043
1044 /****************************************************************************
1045 This function is called on any file modification or lock request. If a file
1046 is level 2 oplocked then it must tell all other level 2 holders to break to
1047 none.
1048 ****************************************************************************/
1049
1050 static void contend_level2_oplocks_begin_default(files_struct *fsp,
1051 enum level2_contention_type type)
1052 {
1053 struct smbd_server_connection *sconn = fsp->conn->sconn;
1054 struct tevent_immediate *im;
1055 struct break_to_none_state *state;
1056 struct byte_range_lock *brl;
1057 uint32_t num_read_oplocks = 0;
1058
1059 /*
1060 * If this file is level II oplocked then we need
1061 * to grab the shared memory lock and inform all
1062 * other files with a level II lock that they need
1063 * to flush their read caches. We keep the lock over
1064 * the shared memory area whilst doing this.
1065 */
1066
1067 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
1068 /*
1069 * There can't be any level2 oplocks, we're alone.
1070 */
1071 return;
1072 }
1073
1074 brl = brl_get_locks_readonly(fsp);
1075 if (brl != NULL) {
1076 num_read_oplocks = brl_num_read_oplocks(brl);
1077 }
1078
1079 DEBUG(10, ("num_read_oplocks = %"PRIu32"\n", num_read_oplocks));
1080
1081 if (num_read_oplocks == 0) {
1082 DEBUG(10, ("No read oplocks around\n"));
1083 return;
1084 }
1085
1086 /*
1087 * When we get here we might have a brlock entry locked. Also
1088 * locking the share mode entry would violate the locking
1089 * order. Breaking level2 oplocks to none is asynchronous
1090 * anyway, so we postpone this into an immediate event.
1091 */
1092
1093 state = talloc_zero(sconn, struct break_to_none_state);
1094 if (state == NULL) {
1095 DEBUG(1, ("talloc failed\n"));
1096 return;
1097 }
1098 state->sconn = sconn;
1099 state->id = fsp->file_id;
1100
1101 if (fsp->oplock_type == LEASE_OPLOCK) {
1102 state->client_guid = *fsp_client_guid(fsp);
1103 state->lease_key = fsp->lease->lease.lease_key;
1104 DEBUG(10, ("Breaking through lease key %"PRIu64"/%"PRIu64"\n",
1105 state->lease_key.data[0],
1106 state->lease_key.data[1]));
1107 }
1108
1109 im = tevent_create_immediate(state);
1110 if (im == NULL) {
1111 DEBUG(1, ("tevent_create_immediate failed\n"));
1112 TALLOC_FREE(state);
1113 return;
1114 }
1115 tevent_schedule_immediate(im, sconn->ev_ctx, do_break_to_none, state);
1116 }
1117
1118 static void send_break_to_none(struct messaging_context *msg_ctx,
1119 const struct share_mode_entry *e)
1120 {
1121 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1122
1123 share_mode_entry_to_message(msg, e);
1124 /* Overload entry->op_type */
1125 SSVAL(msg, OP_BREAK_MSG_OP_TYPE_OFFSET, NO_OPLOCK);
1126
1127 messaging_send_buf(msg_ctx, e->pid, MSG_SMB_BREAK_REQUEST,
1128 (uint8_t *)msg, sizeof(msg));
1129 }
1130
1131 static void do_break_to_none(struct tevent_context *ctx,
1132 struct tevent_immediate *im,
1133 void *private_data)
1134 {
1135 struct break_to_none_state *state = talloc_get_type_abort(
1136 private_data, struct break_to_none_state);
1137 uint32_t i;
1138 struct share_mode_lock *lck;
1139 struct share_mode_data *d;
1140
1141 lck = get_existing_share_mode_lock(talloc_tos(), state->id);
1142 if (lck == NULL) {
1143 DEBUG(1, ("%s: failed to lock share mode entry for file %s.\n",
1144 __func__, file_id_string_tos(&state->id)));
1145 goto done;
1146 }
1147 d = lck->data;
1148
1149 /*
1150 * Walk leases and oplocks separately: We have to send one break per
1151 * lease. If we have multiple share_mode_entry having a common lease,
1152 * we would break the lease twice if we don't walk the leases list
1153 * separately.
1154 */
1155
1156 for (i=0; i<d->num_leases; i++) {
1157 struct share_mode_lease *l = &d->leases[i];
1158 struct share_mode_entry *e = NULL;
1159 uint32_t j;
1160
1161 if ((l->current_state & SMB2_LEASE_READ) == 0) {
1162 continue;
1163 }
1164 if (smb2_lease_equal(&state->client_guid,
1165 &state->lease_key,
1166 &l->client_guid,
1167 &l->lease_key)) {
1168 DEBUG(10, ("Don't break our own lease\n"));
1169 continue;
1170 }
1171
1172 for (j=0; j<d->num_share_modes; j++) {
1173 e = &d->share_modes[j];
1174
1175 if (!is_valid_share_mode_entry(e)) {
1176 continue;
1177 }
1178 if (e->lease_idx == i) {
1179 break;
1180 }
1181 }
1182 if (j == d->num_share_modes) {
1183 DEBUG(0, ("leases[%"PRIu32"] has no share mode\n",
1184 i));
1185 continue;
1186 }
1187
1188 DEBUG(10, ("Breaking lease# %"PRIu32" with share_entry# "
1189 "%"PRIu32"\n", i, j));
1190
1191 send_break_to_none(state->sconn->msg_ctx, e);
1192 }
1193
1194 for(i = 0; i < d->num_share_modes; i++) {
1195 struct share_mode_entry *e = &d->share_modes[i];
1196
1197 if (!is_valid_share_mode_entry(e)) {
1198 continue;
1199 }
1200 if (e->op_type == LEASE_OPLOCK) {
1201 /*
1202 * Took care of those in the loop above
1203 */
1204 continue;
1205 }
1206
1207 /*
1208 * As there could have been multiple writes waiting at the
1209 * lock_share_entry gate we may not be the first to
1210 * enter. Hence the state of the op_types in the share mode
1211 * entries may be partly NO_OPLOCK and partly LEVEL_II
1212 * oplock. It will do no harm to re-send break messages to
1213 * those smbd's that are still waiting their turn to remove
1214 * their LEVEL_II state, and also no harm to ignore existing
1215 * NO_OPLOCK states. JRA.
1216 */
1217
1218 DEBUG(10, ("%s: share_entry[%i]->op_type == %d\n", __func__,
1219 i, e->op_type ));
1220
1221 if (e->op_type == NO_OPLOCK) {
1222 continue;
1223 }
1224
1225 /* Paranoia .... */
1226 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1227 DEBUG(0,("%s: PANIC. "
1228 "share mode entry %d is an exclusive "
1229 "oplock !\n", __func__, i ));
1230 TALLOC_FREE(lck);
1231 abort();
1232 }
1233
1234 send_break_to_none(state->sconn->msg_ctx, e);
1235 }
1236
1237 /* We let the message receivers handle removing the oplock state
1238 in the share mode lock db. */
1239
1240 TALLOC_FREE(lck);
1241 done:
1242 TALLOC_FREE(state);
1243 return;
1244 }
1245
1246 void smbd_contend_level2_oplocks_begin(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 if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
1253 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
1254 return;
1255 }
1256
1257 contend_level2_oplocks_begin_default(fsp, type);
1258 }
1259
1260 void smbd_contend_level2_oplocks_end(files_struct *fsp,
1261 enum level2_contention_type type)
1262 {
1263 struct smbd_server_connection *sconn = fsp->conn->sconn;
1264 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1265
1266 /* Only kernel oplocks implement this so far */
1267 if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
1268 koplocks->ops->contend_level2_oplocks_end(fsp, type);
1269 }
1270 }
1271
1272 /****************************************************************************
1273 Linearize a share mode entry struct to an internal oplock break message.
1274 ****************************************************************************/
1275
1276 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
1277 {
1278 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32_t)e->pid.pid);
1279 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
1280 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
1281 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
1282 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
1283 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
1284 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
1285 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
1286 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1287 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
1288 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
1289 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
1290 SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
1291 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
1292 }
1293
1294 /****************************************************************************
1295 De-linearize an internal oplock break message to a share mode entry struct.
1296 ****************************************************************************/
1297
1298 void message_to_share_mode_entry(struct share_mode_entry *e, const char *msg)
1299 {
1300 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
1301 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
1302 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
1303 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
1304 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
1305 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
1306 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
1307 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
1308 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1309 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
1310 e->uid = (uint32_t)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
1311 e->flags = (uint16_t)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
1312 e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
1313 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
1314 }
1315
1316 /****************************************************************************
1317 Setup oplocks for this process.
1318 ****************************************************************************/
1319
1320 bool init_oplocks(struct smbd_server_connection *sconn)
1321 {
1322 DEBUG(3,("init_oplocks: initializing messages.\n"));
1323
1324 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
1325 process_oplock_break_message);
1326 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
1327 process_kernel_oplock_break);
1328 return true;
1329 }
1330
1331 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1332 {
1333 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1334
1335 /* only initialize once */
1336 if (koplocks == NULL) {
1337 #if HAVE_KERNEL_OPLOCKS_IRIX
1338 koplocks = irix_init_kernel_oplocks(sconn);
1339 #elif HAVE_KERNEL_OPLOCKS_LINUX
1340 koplocks = linux_init_kernel_oplocks(sconn);
1341 #endif
1342 sconn->oplocks.kernel_ops = koplocks;
1343 }
1344 }
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