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winbindd: queryuser - only get group name if needed
[Samba.git] / source3 / smbd / oplock.c
blob1b2a87b8d8a98ab8e1eafc3189edf9e3f31af94e
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 "lib/util/server_id.h"
25 #include "smbd/smbd.h"
26 #include "smbd/globals.h"
27 #include "messages.h"
28 #include "../librpc/gen_ndr/open_files.h"
29 #include "../librpc/gen_ndr/ndr_open_files.h"
30
31 /*
32 * helper function used by the kernel oplock backends to post the break message
33 */
34 void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
35 {
36 uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
37
38 /* Put the kernel break info into the message. */
39 push_file_id_24((char *)msg, &fsp->file_id);
40 SIVAL(msg,24,fsp->fh->gen_id);
41
42 /* Don't need to be root here as we're only ever
43 sending to ourselves. */
44
45 messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
46 MSG_SMB_KERNEL_BREAK,
47 msg, MSG_SMB_KERNEL_BREAK_SIZE);
48 }
49
50 /****************************************************************************
51 Attempt to set an oplock on a file. Succeeds if kernel oplocks are
52 disabled (just sets flags).
53 ****************************************************************************/
54
55 NTSTATUS set_file_oplock(files_struct *fsp)
56 {
57 struct smbd_server_connection *sconn = fsp->conn->sconn;
58 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
59 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
60
61 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
62 if (use_kernel &&
63 !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
64 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
65 "don't support them\n"));
66 return NT_STATUS_NOT_SUPPORTED;
67 }
68 }
69
70 if ((fsp->oplock_type != NO_OPLOCK) &&
71 use_kernel &&
72 !koplocks->ops->set_oplock(koplocks, fsp, fsp->oplock_type))
73 {
74 return map_nt_error_from_unix(errno);
75 }
76
77 fsp->sent_oplock_break = NO_BREAK_SENT;
78 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
79 sconn->oplocks.level_II_open++;
80 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
81 sconn->oplocks.exclusive_open++;
82 }
83
84 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
85 "tv_sec = %x, tv_usec = %x\n",
86 fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
87 fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
88 (int)fsp->open_time.tv_usec ));
89
90 return NT_STATUS_OK;
91 }
92
93 /****************************************************************************
94 Attempt to release an oplock on a file. Decrements oplock count.
95 ****************************************************************************/
96
97 static void release_file_oplock(files_struct *fsp)
98 {
99 struct smbd_server_connection *sconn = fsp->conn->sconn;
100 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
101 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
102
103 if ((fsp->oplock_type != NO_OPLOCK) &&
104 use_kernel) {
105 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
106 }
107
108 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
109 sconn->oplocks.level_II_open--;
110 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
111 sconn->oplocks.exclusive_open--;
112 }
113
114 SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
115 SMB_ASSERT(sconn->oplocks.level_II_open>=0);
116
117 fsp->oplock_type = NO_OPLOCK;
118 fsp->sent_oplock_break = NO_BREAK_SENT;
119
120 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
121 delete_write_cache(fsp);
122
123 TALLOC_FREE(fsp->oplock_timeout);
124 }
125
126 /****************************************************************************
127 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
128 ****************************************************************************/
129
130 static void downgrade_file_oplock(files_struct *fsp)
131 {
132 struct smbd_server_connection *sconn = fsp->conn->sconn;
133 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
134
135 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
136 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
137 return;
138 }
139
140 if (koplocks) {
141 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
142 }
143 fsp->oplock_type = LEVEL_II_OPLOCK;
144 sconn->oplocks.exclusive_open--;
145 sconn->oplocks.level_II_open++;
146 fsp->sent_oplock_break = NO_BREAK_SENT;
147
148 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
149 delete_write_cache(fsp);
150
151 TALLOC_FREE(fsp->oplock_timeout);
152 }
153
154 uint32_t get_lease_type(const struct share_mode_data *d,
155 const struct share_mode_entry *e)
156 {
157 if (e->op_type == LEASE_OPLOCK) {
158 return d->leases[e->lease_idx].current_state;
159 }
160 return map_oplock_to_lease_type(e->op_type);
161 }
162
163 bool update_num_read_oplocks(files_struct *fsp, struct share_mode_lock *lck)
164 {
165 struct share_mode_data *d = lck->data;
166 struct byte_range_lock *br_lck;
167 uint32_t num_read_oplocks = 0;
168 uint32_t i;
169
170 if (fsp_lease_type_is_exclusive(fsp)) {
171 const struct share_mode_entry *e = NULL;
172 uint32_t e_lease_type = 0;
173
174 /*
175 * If we're fully exclusive, we don't need a brlock entry
176 */
177 remove_stale_share_mode_entries(d);
178
179 e = find_share_mode_entry(lck, fsp);
180 if (e != NULL) {
181 e_lease_type = get_lease_type(d, e);
182 }
183
184 if (!lease_type_is_exclusive(e_lease_type)) {
185 char *timestr = NULL;
186
187 timestr = timeval_string(talloc_tos(),
188 &fsp->open_time,
189 true);
190
191 NDR_PRINT_DEBUG(share_mode_data, d);
192 DBG_ERR("file [%s] file_id [%s] gen_id [%lu] "
193 "open_time[%s] lease_type [0x%x] "
194 "oplock_type [0x%x]\n",
195 fsp_str_dbg(fsp),
196 file_id_string_tos(&fsp->file_id),
197 fsp->fh->gen_id, timestr,
198 e_lease_type, fsp->oplock_type);
199
200 smb_panic("Found non-exclusive lease");
201 }
202
203 return true;
204 }
205
206 for (i=0; i<d->num_share_modes; i++) {
207 struct share_mode_entry *e = &d->share_modes[i];
208 uint32_t e_lease_type = get_lease_type(d, e);
209
210 if (e_lease_type & SMB2_LEASE_READ) {
211 num_read_oplocks += 1;
212 }
213 }
214
215 br_lck = brl_get_locks_readonly(fsp);
216 if (br_lck == NULL) {
217 return false;
218 }
219 if (brl_num_read_oplocks(br_lck) == num_read_oplocks) {
220 return true;
221 }
222
223 br_lck = brl_get_locks(talloc_tos(), fsp);
224 if (br_lck == NULL) {
225 return false;
226 }
227 brl_set_num_read_oplocks(br_lck, num_read_oplocks);
228 TALLOC_FREE(br_lck);
229 return true;
230 }
231
232 /****************************************************************************
233 Remove a file oplock with lock already held. Copes with level II and exclusive.
234 ****************************************************************************/
235
236 bool remove_oplock_under_lock(files_struct *fsp, struct share_mode_lock *lck)
237 {
238 bool ret;
239
240 ret = remove_share_oplock(lck, fsp);
241 if (!ret) {
242 DBG_ERR("failed to remove share oplock for "
243 "file %s, %s, %s\n",
244 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
245 file_id_string_tos(&fsp->file_id));
246 }
247 release_file_oplock(fsp);
248
249 ret = update_num_read_oplocks(fsp, lck);
250 if (!ret) {
251 DBG_ERR("update_num_read_oplocks failed for "
252 "file %s, %s, %s\n",
253 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
254 file_id_string_tos(&fsp->file_id));
255 }
256
257 return ret;
258 }
259
260 /****************************************************************************
261 Remove a file oplock. Copes with level II and exclusive.
262 Locks then unlocks the share mode lock. Client can decide to go directly
263 to none even if a "break-to-level II" was sent.
264 ****************************************************************************/
265
266 bool remove_oplock(files_struct *fsp)
267 {
268 bool ret;
269 struct share_mode_lock *lck;
270
271 DBG_DEBUG("remove_oplock called for %s\n", fsp_str_dbg(fsp));
272
273 /* Remove the oplock flag from the sharemode. */
274 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
275 if (lck == NULL) {
276 DBG_ERR("failed to lock share entry for "
277 "file %s\n", fsp_str_dbg(fsp));
278 return false;
279 }
280
281 ret = remove_oplock_under_lock(fsp, lck);
282
283 TALLOC_FREE(lck);
284 return ret;
285 }
286
287 /*
288 * Deal with a reply when a break-to-level II was sent.
289 */
290 bool downgrade_oplock(files_struct *fsp)
291 {
292 bool ret;
293 struct share_mode_lock *lck;
294
295 DEBUG(10, ("downgrade_oplock called for %s\n",
296 fsp_str_dbg(fsp)));
297
298 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
299 if (lck == NULL) {
300 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
301 "file %s\n", fsp_str_dbg(fsp)));
302 return False;
303 }
304 ret = downgrade_share_oplock(lck, fsp);
305 if (!ret) {
306 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
307 "for file %s, %s, file_id %s\n",
308 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
309 file_id_string_tos(&fsp->file_id)));
310 }
311 downgrade_file_oplock(fsp);
312
313 ret = update_num_read_oplocks(fsp, lck);
314 if (!ret) {
315 DEBUG(0, ("%s: update_num_read_oplocks failed for "
316 "file %s, %s, %s\n",
317 __func__, fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
318 file_id_string_tos(&fsp->file_id)));
319 }
320
321 TALLOC_FREE(lck);
322 return ret;
323 }
324
325 static void lease_timeout_handler(struct tevent_context *ctx,
326 struct tevent_timer *te,
327 struct timeval now,
328 void *private_data)
329 {
330 struct fsp_lease *lease =
331 talloc_get_type_abort(private_data,
332 struct fsp_lease);
333 struct files_struct *fsp;
334 struct share_mode_lock *lck;
335 uint16_t old_epoch = lease->lease.lease_epoch;
336
337 fsp = file_find_one_fsp_from_lease_key(lease->sconn,
338 &lease->lease.lease_key);
339 if (fsp == NULL) {
340 /* race? */
341 TALLOC_FREE(lease->timeout);
342 return;
343 }
344
345 lck = get_existing_share_mode_lock(
346 talloc_tos(), fsp->file_id);
347 if (lck == NULL) {
348 /* race? */
349 TALLOC_FREE(lease->timeout);
350 return;
351 }
352
353 fsp_lease_update(lck, fsp_client_guid(fsp), lease);
354
355 if (lease->lease.lease_epoch != old_epoch) {
356 /*
357 * If the epoch changed we need to wait for
358 * the next timeout to happen.
359 */
360 DEBUG(10, ("lease break timeout race (epoch) for file %s - ignoring\n",
361 fsp_str_dbg(fsp)));
362 TALLOC_FREE(lck);
363 return;
364 }
365
366 if (!(lease->lease.lease_flags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)) {
367 /*
368 * If the epoch changed we need to wait for
369 * the next timeout to happen.
370 */
371 DEBUG(10, ("lease break timeout race (flags) for file %s - ignoring\n",
372 fsp_str_dbg(fsp)));
373 TALLOC_FREE(lck);
374 return;
375 }
376
377 DEBUG(1, ("lease break timed out for file %s -- replying anyway\n",
378 fsp_str_dbg(fsp)));
379 (void)downgrade_lease(lease->sconn->client->connections,
380 1,
381 &fsp->file_id,
382 &lease->lease.lease_key,
383 SMB2_LEASE_NONE);
384
385 TALLOC_FREE(lck);
386 }
387
388 bool fsp_lease_update(struct share_mode_lock *lck,
389 const struct GUID *client_guid,
390 struct fsp_lease *lease)
391 {
392 struct share_mode_data *d = lck->data;
393 int idx;
394 struct share_mode_lease *l = NULL;
395
396 idx = find_share_mode_lease(d, client_guid, &lease->lease.lease_key);
397 if (idx != -1) {
398 l = &d->leases[idx];
399 }
400
401 if (l == NULL) {
402 DEBUG(1, ("%s: Could not find lease entry\n", __func__));
403 TALLOC_FREE(lease->timeout);
404 lease->lease.lease_state = SMB2_LEASE_NONE;
405 lease->lease.lease_epoch += 1;
406 lease->lease.lease_flags = 0;
407 return false;
408 }
409
410 DEBUG(10,("%s: refresh lease state\n", __func__));
411
412 /* Ensure we're in sync with current lease state. */
413 if (lease->lease.lease_epoch != l->epoch) {
414 DEBUG(10,("%s: cancel outdated timeout\n", __func__));
415 TALLOC_FREE(lease->timeout);
416 }
417 lease->lease.lease_epoch = l->epoch;
418 lease->lease.lease_state = l->current_state;
419
420 if (l->breaking) {
421 lease->lease.lease_flags |= SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
422
423 if (lease->timeout == NULL) {
424 struct timeval t = timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0);
425
426 DEBUG(10,("%s: setup timeout handler\n", __func__));
427
428 lease->timeout = tevent_add_timer(lease->sconn->ev_ctx,
429 lease, t,
430 lease_timeout_handler,
431 lease);
432 if (lease->timeout == NULL) {
433 DEBUG(0, ("%s: Could not add lease timeout handler\n",
434 __func__));
435 }
436 }
437 } else {
438 lease->lease.lease_flags &= ~SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
439 TALLOC_FREE(lease->timeout);
440 }
441
442 return true;
443 }
444
445 struct downgrade_lease_additional_state {
446 struct tevent_immediate *im;
447 struct smbXsrv_connection *xconn;
448 uint32_t break_flags;
449 struct smb2_lease_key lease_key;
450 uint32_t break_from;
451 uint32_t break_to;
452 uint16_t new_epoch;
453 };
454
455 static void downgrade_lease_additional_trigger(struct tevent_context *ev,
456 struct tevent_immediate *im,
457 void *private_data)
458 {
459 struct downgrade_lease_additional_state *state =
460 talloc_get_type_abort(private_data,
461 struct downgrade_lease_additional_state);
462 struct smbXsrv_connection *xconn = state->xconn;
463 NTSTATUS status;
464
465 status = smbd_smb2_send_lease_break(xconn,
466 state->new_epoch,
467 state->break_flags,
468 &state->lease_key,
469 state->break_from,
470 state->break_to);
471 TALLOC_FREE(state);
472 if (!NT_STATUS_IS_OK(status)) {
473 smbd_server_connection_terminate(xconn,
474 nt_errstr(status));
475 return;
476 }
477 }
478
479 struct downgrade_lease_fsps_state {
480 struct file_id id;
481 struct share_mode_lock *lck;
482 const struct smb2_lease_key *key;
483 };
484
485 static struct files_struct *downgrade_lease_fsps(struct files_struct *fsp,
486 void *private_data)
487 {
488 struct downgrade_lease_fsps_state *state =
489 (struct downgrade_lease_fsps_state *)private_data;
490
491 if (fsp->oplock_type != LEASE_OPLOCK) {
492 return NULL;
493 }
494 if (!smb2_lease_key_equal(&fsp->lease->lease.lease_key, state->key)) {
495 return NULL;
496 }
497 if (!file_id_equal(&fsp->file_id, &state->id)) {
498 return NULL;
499 }
500
501 fsp_lease_update(state->lck, fsp_client_guid(fsp), fsp->lease);
502
503 return NULL;
504 }
505
506 NTSTATUS downgrade_lease(struct smbXsrv_connection *xconn,
507 uint32_t num_file_ids,
508 const struct file_id *ids,
509 const struct smb2_lease_key *key,
510 uint32_t lease_state)
511 {
512 struct smbd_server_connection *sconn = xconn->client->sconn;
513 struct share_mode_lock *lck;
514 struct share_mode_lease *l = NULL;
515 const struct file_id id = ids[0];
516 uint32_t i;
517 NTSTATUS status;
518
519 DEBUG(10, ("%s: Downgrading %s to %x\n", __func__,
520 file_id_string_tos(&id), (unsigned)lease_state));
521
522 lck = get_existing_share_mode_lock(talloc_tos(), id);
523 if (lck == NULL) {
524 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
525 }
526 status = downgrade_share_lease(sconn, lck, key, lease_state, &l);
527
528 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
529 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
530
531 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
532 struct downgrade_lease_additional_state *state;
533
534 state = talloc_zero(xconn,
535 struct downgrade_lease_additional_state);
536 if (state == NULL) {
537 TALLOC_FREE(lck);
538 return NT_STATUS_NO_MEMORY;
539 }
540
541 state->im = tevent_create_immediate(state);
542 if (state->im == NULL) {
543 TALLOC_FREE(state);
544 TALLOC_FREE(lck);
545 return NT_STATUS_NO_MEMORY;
546 }
547
548 state->xconn = xconn;
549 if (l->current_state & (~SMB2_LEASE_READ)) {
550 state->break_flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
551 }
552 state->lease_key = l->lease_key;
553 state->break_from = l->current_state;
554 state->break_to = l->breaking_to_requested;
555 if (l->lease_version > 1) {
556 state->new_epoch = l->epoch;
557 }
558
559 if (state->break_flags == 0) {
560 /*
561 * This is an async break without
562 * SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED
563 *
564 * we need to store NONE state in the
565 * database.
566 */
567 l->current_state = 0;
568 l->breaking_to_requested = 0;
569 l->breaking_to_required = 0;
570 l->breaking = false;
571
572 lck->data->modified = true;
573 }
574
575 tevent_schedule_immediate(state->im, xconn->ev_ctx,
576 downgrade_lease_additional_trigger,
577 state);
578 }
579
580 {
581 struct downgrade_lease_fsps_state state = {
582 .id = id, .lck = lck, .key = key,
583 };
584
585 files_forall(sconn, downgrade_lease_fsps, &state);
586 }
587
588 TALLOC_FREE(lck);
589 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
590 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
591
592 /*
593 * Dynamic share case. Ensure other opens are copies.
594 * This will only be breaking to NONE.
595 */
596
597 for (i = 1; i < num_file_ids; i++) {
598 lck = get_existing_share_mode_lock(talloc_tos(), ids[i]);
599 if (lck == NULL) {
600 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
601 }
602
603 {
604 struct downgrade_lease_fsps_state state = {
605 .id = ids[i], .lck = lck, .key = key,
606 };
607
608 files_forall(sconn, downgrade_lease_fsps, &state);
609 }
610
611 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
612 file_id_string_tos(&ids[i]), (unsigned)lease_state, nt_errstr(status)));
613
614 TALLOC_FREE(lck);
615 }
616
617 return status;
618 }
619
620 /****************************************************************************
621 Set up an oplock break message.
622 ****************************************************************************/
623
624 #define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
625
626 static void new_break_message_smb1(files_struct *fsp, int cmd,
627 char result[SMB1_BREAK_MESSAGE_LENGTH])
628 {
629 memset(result,'\0',smb_size);
630 srv_set_message(result,8,0,true);
631 SCVAL(result,smb_com,SMBlockingX);
632 SSVAL(result,smb_tid,fsp->conn->cnum);
633 SSVAL(result,smb_pid,0xFFFF);
634 SSVAL(result,smb_uid,0);
635 SSVAL(result,smb_mid,0xFFFF);
636 SCVAL(result,smb_vwv0,0xFF);
637 SSVAL(result,smb_vwv2,fsp->fnum);
638 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
639 SCVAL(result,smb_vwv3+1,cmd);
640 }
641
642 /****************************************************************************
643 Function to do the waiting before sending a local break.
644 ****************************************************************************/
645
646 static void wait_before_sending_break(void)
647 {
648 long wait_time = (long)lp_oplock_break_wait_time();
649
650 if (wait_time) {
651 smb_msleep(wait_time);
652 }
653 }
654
655 /****************************************************************************
656 Ensure that we have a valid oplock.
657 ****************************************************************************/
658
659 static files_struct *initial_break_processing(
660 struct smbd_server_connection *sconn, struct file_id id,
661 unsigned long file_id)
662 {
663 files_struct *fsp = NULL;
664
665 DEBUG(3, ("initial_break_processing: called for %s/%u\n"
666 "Current oplocks_open (exclusive = %d, levelII = %d)\n",
667 file_id_string_tos(&id), (int)file_id,
668 sconn->oplocks.exclusive_open,
669 sconn->oplocks.level_II_open));
670
671 /*
672 * We need to search the file open table for the
673 * entry containing this dev and inode, and ensure
674 * we have an oplock on it.
675 */
676
677 fsp = file_find_dif(sconn, id, file_id);
678
679 if(fsp == NULL) {
680 /* The file could have been closed in the meantime - return success. */
681 DEBUG(3, ("initial_break_processing: cannot find open file "
682 "with file_id %s gen_id = %lu, allowing break to "
683 "succeed.\n", file_id_string_tos(&id), file_id));
684 return NULL;
685 }
686
687 /* Ensure we have an oplock on the file */
688
689 /*
690 * There is a potential race condition in that an oplock could
691 * have been broken due to another udp request, and yet there are
692 * still oplock break messages being sent in the udp message
693 * queue for this file. So return true if we don't have an oplock,
694 * as we may have just freed it.
695 */
696
697 if(fsp->oplock_type == NO_OPLOCK) {
698 DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
699 "gen_id = %lu) has no oplock. Allowing break to "
700 "succeed regardless.\n", fsp_str_dbg(fsp),
701 file_id_string_tos(&id), fsp->fh->gen_id));
702 return NULL;
703 }
704
705 return fsp;
706 }
707
708 static void oplock_timeout_handler(struct tevent_context *ctx,
709 struct tevent_timer *te,
710 struct timeval now,
711 void *private_data)
712 {
713 files_struct *fsp = (files_struct *)private_data;
714
715 SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
716
717 /* Remove the timed event handler. */
718 TALLOC_FREE(fsp->oplock_timeout);
719 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
720 fsp_str_dbg(fsp)));
721 remove_oplock(fsp);
722 }
723
724 /*******************************************************************
725 Add a timeout handler waiting for the client reply.
726 *******************************************************************/
727
728 static void add_oplock_timeout_handler(files_struct *fsp)
729 {
730 struct smbd_server_connection *sconn = fsp->conn->sconn;
731 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
732
733 /*
734 * If kernel oplocks already notifies smbds when an oplock break times
735 * out, just return.
736 */
737 if (koplocks &&
738 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
739 return;
740 }
741
742 if (fsp->oplock_timeout != NULL) {
743 DEBUG(0, ("Logic problem -- have an oplock event hanging "
744 "around\n"));
745 }
746
747 fsp->oplock_timeout =
748 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
749 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
750 oplock_timeout_handler, fsp);
751
752 if (fsp->oplock_timeout == NULL) {
753 DEBUG(0, ("Could not add oplock timeout handler\n"));
754 }
755 }
756
757 static void send_break_message_smb1(files_struct *fsp, int level)
758 {
759 struct smbXsrv_connection *xconn = NULL;
760 char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
761
762 /*
763 * For SMB1 we only have one connection
764 */
765 xconn = fsp->conn->sconn->client->connections;
766
767 new_break_message_smb1(fsp, level, break_msg);
768
769 show_msg(break_msg);
770 if (!srv_send_smb(xconn,
771 break_msg, false, 0,
772 IS_CONN_ENCRYPTED(fsp->conn),
773 NULL)) {
774 exit_server_cleanly("send_break_message_smb1: "
775 "srv_send_smb failed.");
776 }
777 }
778
779 /*******************************************************************
780 This handles the generic oplock break message from another smbd.
781 *******************************************************************/
782
783 static void process_oplock_break_message(struct messaging_context *msg_ctx,
784 void *private_data,
785 uint32_t msg_type,
786 struct server_id src,
787 DATA_BLOB *data)
788 {
789 struct share_mode_entry msg;
790 files_struct *fsp;
791 bool use_kernel;
792 struct smbd_server_connection *sconn =
793 talloc_get_type_abort(private_data,
794 struct smbd_server_connection);
795 struct server_id self = messaging_server_id(sconn->msg_ctx);
796 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
797 uint16_t break_from;
798 uint16_t break_to;
799 bool break_needed = true;
800 struct server_id_buf tmp;
801
802 if (data->data == NULL) {
803 DEBUG(0, ("Got NULL buffer\n"));
804 return;
805 }
806
807 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
808 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
809 return;
810 }
811
812 /* De-linearize incoming message. */
813 message_to_share_mode_entry(&msg, (char *)data->data);
814 break_to = msg.op_type;
815
816 DEBUG(10, ("Got oplock break to %u message from pid %s: %s/%llu\n",
817 (unsigned)break_to, server_id_str_buf(src, &tmp),
818 file_id_string_tos(&msg.id),
819 (unsigned long long)msg.share_file_id));
820
821 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
822
823 if (fsp == NULL) {
824 /* We hit a race here. Break messages are sent, and before we
825 * get to process this message, we have closed the file. */
826 DEBUG(3, ("Did not find fsp\n"));
827 return;
828 }
829
830 break_from = fsp_lease_type(fsp);
831
832 if (fsp->oplock_type != LEASE_OPLOCK) {
833 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
834 /*
835 * Nothing to do anymore
836 */
837 DEBUG(10, ("fsp->sent_oplock_break = %d\n",
838 fsp->sent_oplock_break));
839 return;
840 }
841 }
842
843 if (!(global_client_caps & CAP_LEVEL_II_OPLOCKS)) {
844 DEBUG(10, ("client_caps without level2 oplocks\n"));
845 break_to &= ~SMB2_LEASE_READ;
846 }
847
848 use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
849 if (use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
850 DEBUG(10, ("Kernel oplocks don't allow level2\n"));
851 break_to &= ~SMB2_LEASE_READ;
852 }
853
854 if (!lp_level2_oplocks(SNUM(fsp->conn))) {
855 DEBUG(10, ("no level2 oplocks by config\n"));
856 break_to &= ~SMB2_LEASE_READ;
857 }
858
859 if (fsp->oplock_type == LEASE_OPLOCK) {
860 struct share_mode_lock *lck;
861 int idx;
862
863 lck = get_existing_share_mode_lock(
864 talloc_tos(), fsp->file_id);
865 if (lck == NULL) {
866 /*
867 * We hit a race here. Break messages are sent, and
868 * before we get to process this message, we have closed
869 * the file.
870 */
871 DEBUG(3, ("Did not find share_mode\n"));
872 return;
873 }
874
875 idx = find_share_mode_lease(
876 lck->data,
877 fsp_client_guid(fsp),
878 &fsp->lease->lease.lease_key);
879 if (idx != -1) {
880 struct share_mode_lease *l;
881 l = &lck->data->leases[idx];
882
883 break_from = l->current_state;
884 break_to &= l->current_state;
885
886 if (l->breaking) {
887 break_to &= l->breaking_to_required;
888 if (l->breaking_to_required != break_to) {
889 /*
890 * Note we don't increment the epoch
891 * here, which might be a bug in
892 * Windows too...
893 */
894 l->breaking_to_required = break_to;
895 lck->data->modified = true;
896 }
897 break_needed = false;
898 } else if (l->current_state == break_to) {
899 break_needed = false;
900 } else if (l->current_state == SMB2_LEASE_READ) {
901 l->current_state = SMB2_LEASE_NONE;
902 /* Need to increment the epoch */
903 l->epoch += 1;
904 lck->data->modified = true;
905 } else {
906 l->breaking = true;
907 l->breaking_to_required = break_to;
908 l->breaking_to_requested = break_to;
909 /* Need to increment the epoch */
910 l->epoch += 1;
911 lck->data->modified = true;
912 }
913
914 /* Ensure we're in sync with current lease state. */
915 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
916 }
917
918 TALLOC_FREE(lck);
919 }
920
921 if (!break_needed) {
922 DEBUG(10,("%s: skip break\n", __func__));
923 return;
924 }
925
926 if ((break_from == SMB2_LEASE_NONE) && !break_needed) {
927 DEBUG(3, ("Already downgraded oplock to none on %s: %s\n",
928 file_id_string_tos(&fsp->file_id),
929 fsp_str_dbg(fsp)));
930 return;
931 }
932
933 DEBUG(10, ("break_from=%u, break_to=%u\n",
934 (unsigned)break_from, (unsigned)break_to));
935
936 if ((break_from == break_to) && !break_needed) {
937 DEBUG(3, ("Already downgraded oplock to %u on %s: %s\n",
938 (unsigned)break_to,
939 file_id_string_tos(&fsp->file_id),
940 fsp_str_dbg(fsp)));
941 return;
942 }
943
944 /* Need to wait before sending a break
945 message if we sent ourselves this message. */
946 if (serverid_equal(&self, &src)) {
947 wait_before_sending_break();
948 }
949
950 if (sconn->using_smb2) {
951 send_break_message_smb2(fsp, break_from, break_to);
952 } else {
953 send_break_message_smb1(fsp, (break_to & SMB2_LEASE_READ) ?
954 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
955 }
956
957 if ((break_from == SMB2_LEASE_READ) &&
958 (break_to == SMB2_LEASE_NONE)) {
959 /*
960 * This is an async break without a reply and thus no timeout
961 *
962 * leases are handled above.
963 */
964 if (fsp->oplock_type != LEASE_OPLOCK) {
965 remove_oplock(fsp);
966 }
967 return;
968 }
969 if (fsp->oplock_type == LEASE_OPLOCK) {
970 return;
971 }
972
973 fsp->sent_oplock_break = (break_to & SMB2_LEASE_READ) ?
974 LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
975
976 add_oplock_timeout_handler(fsp);
977 }
978
979 /*******************************************************************
980 This handles the kernel oplock break message.
981 *******************************************************************/
982
983 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
984 void *private_data,
985 uint32_t msg_type,
986 struct server_id src,
987 DATA_BLOB *data)
988 {
989 struct file_id id;
990 unsigned long file_id;
991 files_struct *fsp;
992 struct smbd_server_connection *sconn =
993 talloc_get_type_abort(private_data,
994 struct smbd_server_connection);
995 struct server_id_buf tmp;
996
997 if (data->data == NULL) {
998 DEBUG(0, ("Got NULL buffer\n"));
999 return;
1000 }
1001
1002 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
1003 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
1004 return;
1005 }
1006
1007 /* Pull the data from the message. */
1008 pull_file_id_24((char *)data->data, &id);
1009 file_id = (unsigned long)IVAL(data->data, 24);
1010
1011 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
1012 server_id_str_buf(src, &tmp), file_id_string_tos(&id),
1013 (unsigned int)file_id));
1014
1015 fsp = initial_break_processing(sconn, id, file_id);
1016
1017 if (fsp == NULL) {
1018 DEBUG(3, ("Got a kernel oplock break message for a file "
1019 "I don't know about\n"));
1020 return;
1021 }
1022
1023 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
1024 /* This is ok, kernel oplocks come in completely async */
1025 DEBUG(3, ("Got a kernel oplock request while waiting for a "
1026 "break reply\n"));
1027 return;
1028 }
1029
1030 if (sconn->using_smb2) {
1031 send_break_message_smb2(fsp, 0, OPLOCKLEVEL_NONE);
1032 } else {
1033 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
1034 }
1035
1036 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
1037
1038 add_oplock_timeout_handler(fsp);
1039 }
1040
1041 struct break_to_none_state {
1042 struct smbd_server_connection *sconn;
1043 struct file_id id;
1044 struct smb2_lease_key lease_key;
1045 struct GUID client_guid;
1046 };
1047 static void do_break_to_none(struct tevent_context *ctx,
1048 struct tevent_immediate *im,
1049 void *private_data);
1050
1051 /****************************************************************************
1052 This function is called on any file modification or lock request. If a file
1053 is level 2 oplocked then it must tell all other level 2 holders to break to
1054 none.
1055 ****************************************************************************/
1056
1057 static void contend_level2_oplocks_begin_default(files_struct *fsp,
1058 enum level2_contention_type type)
1059 {
1060 struct smbd_server_connection *sconn = fsp->conn->sconn;
1061 struct tevent_immediate *im;
1062 struct break_to_none_state *state;
1063 struct byte_range_lock *brl;
1064 uint32_t num_read_oplocks = 0;
1065
1066 /*
1067 * If this file is level II oplocked then we need
1068 * to grab the shared memory lock and inform all
1069 * other files with a level II lock that they need
1070 * to flush their read caches. We keep the lock over
1071 * the shared memory area whilst doing this.
1072 */
1073
1074 if (fsp_lease_type_is_exclusive(fsp)) {
1075 /*
1076 * There can't be any level2 oplocks, we're alone.
1077 */
1078 return;
1079 }
1080
1081 brl = brl_get_locks_readonly(fsp);
1082 if (brl != NULL) {
1083 num_read_oplocks = brl_num_read_oplocks(brl);
1084 }
1085
1086 DEBUG(10, ("num_read_oplocks = %"PRIu32"\n", num_read_oplocks));
1087
1088 if (num_read_oplocks == 0) {
1089 DEBUG(10, ("No read oplocks around\n"));
1090 return;
1091 }
1092
1093 /*
1094 * When we get here we might have a brlock entry locked. Also
1095 * locking the share mode entry would violate the locking
1096 * order. Breaking level2 oplocks to none is asynchronous
1097 * anyway, so we postpone this into an immediate event.
1098 */
1099
1100 state = talloc_zero(sconn, struct break_to_none_state);
1101 if (state == NULL) {
1102 DEBUG(1, ("talloc failed\n"));
1103 return;
1104 }
1105 state->sconn = sconn;
1106 state->id = fsp->file_id;
1107
1108 if (fsp->oplock_type == LEASE_OPLOCK) {
1109 state->client_guid = *fsp_client_guid(fsp);
1110 state->lease_key = fsp->lease->lease.lease_key;
1111 DEBUG(10, ("Breaking through lease key %"PRIu64"/%"PRIu64"\n",
1112 state->lease_key.data[0],
1113 state->lease_key.data[1]));
1114 }
1115
1116 im = tevent_create_immediate(state);
1117 if (im == NULL) {
1118 DEBUG(1, ("tevent_create_immediate failed\n"));
1119 TALLOC_FREE(state);
1120 return;
1121 }
1122 tevent_schedule_immediate(im, sconn->ev_ctx, do_break_to_none, state);
1123 }
1124
1125 static void send_break_to_none(struct messaging_context *msg_ctx,
1126 const struct share_mode_entry *e)
1127 {
1128 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1129
1130 share_mode_entry_to_message(msg, e);
1131 /* Overload entry->op_type */
1132 SSVAL(msg, OP_BREAK_MSG_OP_TYPE_OFFSET, NO_OPLOCK);
1133
1134 messaging_send_buf(msg_ctx, e->pid, MSG_SMB_BREAK_REQUEST,
1135 (uint8_t *)msg, sizeof(msg));
1136 }
1137
1138 static void do_break_to_none(struct tevent_context *ctx,
1139 struct tevent_immediate *im,
1140 void *private_data)
1141 {
1142 struct break_to_none_state *state = talloc_get_type_abort(
1143 private_data, struct break_to_none_state);
1144 uint32_t i;
1145 struct share_mode_lock *lck;
1146 struct share_mode_data *d;
1147
1148 lck = get_existing_share_mode_lock(talloc_tos(), state->id);
1149 if (lck == NULL) {
1150 DEBUG(1, ("%s: failed to lock share mode entry for file %s.\n",
1151 __func__, file_id_string_tos(&state->id)));
1152 goto done;
1153 }
1154 d = lck->data;
1155
1156 /*
1157 * Walk leases and oplocks separately: We have to send one break per
1158 * lease. If we have multiple share_mode_entry having a common lease,
1159 * we would break the lease twice if we don't walk the leases list
1160 * separately.
1161 */
1162
1163 for (i=0; i<d->num_leases; i++) {
1164 struct share_mode_lease *l = &d->leases[i];
1165 struct share_mode_entry *e = NULL;
1166 uint32_t j;
1167
1168 if ((l->current_state & SMB2_LEASE_READ) == 0) {
1169 continue;
1170 }
1171 if (smb2_lease_equal(&state->client_guid,
1172 &state->lease_key,
1173 &l->client_guid,
1174 &l->lease_key)) {
1175 DEBUG(10, ("Don't break our own lease\n"));
1176 continue;
1177 }
1178
1179 for (j=0; j<d->num_share_modes; j++) {
1180 e = &d->share_modes[j];
1181
1182 if (!is_valid_share_mode_entry(e)) {
1183 continue;
1184 }
1185 if (e->lease_idx == i) {
1186 break;
1187 }
1188 }
1189 if (j == d->num_share_modes) {
1190 DEBUG(0, ("leases[%"PRIu32"] has no share mode\n",
1191 i));
1192 continue;
1193 }
1194
1195 DEBUG(10, ("Breaking lease# %"PRIu32" with share_entry# "
1196 "%"PRIu32"\n", i, j));
1197
1198 send_break_to_none(state->sconn->msg_ctx, e);
1199 }
1200
1201 for(i = 0; i < d->num_share_modes; i++) {
1202 struct share_mode_entry *e = &d->share_modes[i];
1203
1204 if (!is_valid_share_mode_entry(e)) {
1205 continue;
1206 }
1207 if (e->op_type == LEASE_OPLOCK) {
1208 /*
1209 * Took care of those in the loop above
1210 */
1211 continue;
1212 }
1213
1214 /*
1215 * As there could have been multiple writes waiting at the
1216 * lock_share_entry gate we may not be the first to
1217 * enter. Hence the state of the op_types in the share mode
1218 * entries may be partly NO_OPLOCK and partly LEVEL_II
1219 * oplock. It will do no harm to re-send break messages to
1220 * those smbd's that are still waiting their turn to remove
1221 * their LEVEL_II state, and also no harm to ignore existing
1222 * NO_OPLOCK states. JRA.
1223 */
1224
1225 DEBUG(10, ("%s: share_entry[%i]->op_type == %d\n", __func__,
1226 i, e->op_type ));
1227
1228 if (e->op_type == NO_OPLOCK) {
1229 continue;
1230 }
1231
1232 /* Paranoia .... */
1233 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1234 DEBUG(0,("%s: PANIC. "
1235 "share mode entry %d is an exclusive "
1236 "oplock !\n", __func__, i ));
1237 TALLOC_FREE(lck);
1238 abort();
1239 }
1240
1241 send_break_to_none(state->sconn->msg_ctx, e);
1242 }
1243
1244 /* We let the message receivers handle removing the oplock state
1245 in the share mode lock db. */
1246
1247 TALLOC_FREE(lck);
1248 done:
1249 TALLOC_FREE(state);
1250 return;
1251 }
1252
1253 void smbd_contend_level2_oplocks_begin(files_struct *fsp,
1254 enum level2_contention_type type)
1255 {
1256 struct smbd_server_connection *sconn = fsp->conn->sconn;
1257 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1258
1259 if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
1260 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
1261 return;
1262 }
1263
1264 contend_level2_oplocks_begin_default(fsp, type);
1265 }
1266
1267 void smbd_contend_level2_oplocks_end(files_struct *fsp,
1268 enum level2_contention_type type)
1269 {
1270 struct smbd_server_connection *sconn = fsp->conn->sconn;
1271 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1272
1273 /* Only kernel oplocks implement this so far */
1274 if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
1275 koplocks->ops->contend_level2_oplocks_end(fsp, type);
1276 }
1277 }
1278
1279 /****************************************************************************
1280 Linearize a share mode entry struct to an internal oplock break message.
1281 ****************************************************************************/
1282
1283 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
1284 {
1285 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32_t)e->pid.pid);
1286 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
1287 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
1288 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
1289 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
1290 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
1291 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
1292 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
1293 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1294 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
1295 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
1296 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
1297 SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
1298 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
1299 }
1300
1301 /****************************************************************************
1302 De-linearize an internal oplock break message to a share mode entry struct.
1303 ****************************************************************************/
1304
1305 void message_to_share_mode_entry(struct share_mode_entry *e, const char *msg)
1306 {
1307 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
1308 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
1309 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
1310 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
1311 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
1312 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
1313 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
1314 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
1315 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1316 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
1317 e->uid = (uint32_t)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
1318 e->flags = (uint16_t)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
1319 e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
1320 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
1321 }
1322
1323 /****************************************************************************
1324 Setup oplocks for this process.
1325 ****************************************************************************/
1326
1327 bool init_oplocks(struct smbd_server_connection *sconn)
1328 {
1329 DEBUG(3,("init_oplocks: initializing messages.\n"));
1330
1331 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
1332 process_oplock_break_message);
1333 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
1334 process_kernel_oplock_break);
1335 return true;
1336 }
1337
1338 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1339 {
1340 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1341
1342 /* only initialize once */
1343 if (koplocks == NULL) {
1344 #if HAVE_KERNEL_OPLOCKS_IRIX
1345 koplocks = irix_init_kernel_oplocks(sconn);
1346 #elif HAVE_KERNEL_OPLOCKS_LINUX
1347 koplocks = linux_init_kernel_oplocks(sconn);
1348 #endif
1349 sconn->oplocks.kernel_ops = koplocks;
1350 }
1351 }
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