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ctdb-tests: Avoid segfault by initializing logging
[Samba.git] / source3 / smbd / oplock.c
blobe848b5e0d862cb1ae13418ca8b07d440d77a5726
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)) &&
60 (koplocks != NULL);
61
62 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
63 if (use_kernel &&
64 !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
65 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
66 "don't support them\n"));
67 return NT_STATUS_NOT_SUPPORTED;
68 }
69 }
70
71 if ((fsp->oplock_type != NO_OPLOCK) &&
72 use_kernel &&
73 !koplocks->ops->set_oplock(koplocks, fsp, fsp->oplock_type))
74 {
75 return map_nt_error_from_unix(errno);
76 }
77
78 fsp->sent_oplock_break = NO_BREAK_SENT;
79 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
80 sconn->oplocks.level_II_open++;
81 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
82 sconn->oplocks.exclusive_open++;
83 }
84
85 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
86 "tv_sec = %x, tv_usec = %x\n",
87 fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
88 fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
89 (int)fsp->open_time.tv_usec ));
90
91 return NT_STATUS_OK;
92 }
93
94 /****************************************************************************
95 Attempt to release an oplock on a file. Decrements oplock count.
96 ****************************************************************************/
97
98 static void release_file_oplock(files_struct *fsp)
99 {
100 struct smbd_server_connection *sconn = fsp->conn->sconn;
101 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
102 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
103 (koplocks != NULL);
104
105 if ((fsp->oplock_type != NO_OPLOCK) &&
106 use_kernel) {
107 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
108 }
109
110 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
111 sconn->oplocks.level_II_open--;
112 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
113 sconn->oplocks.exclusive_open--;
114 }
115
116 SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
117 SMB_ASSERT(sconn->oplocks.level_II_open>=0);
118
119 fsp->oplock_type = NO_OPLOCK;
120 fsp->sent_oplock_break = NO_BREAK_SENT;
121
122 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
123 delete_write_cache(fsp);
124
125 TALLOC_FREE(fsp->oplock_timeout);
126 }
127
128 /****************************************************************************
129 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
130 ****************************************************************************/
131
132 static void downgrade_file_oplock(files_struct *fsp)
133 {
134 struct smbd_server_connection *sconn = fsp->conn->sconn;
135 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
136 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
137 (koplocks != NULL);
138
139 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
140 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
141 return;
142 }
143
144 if (use_kernel) {
145 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
146 }
147 fsp->oplock_type = LEVEL_II_OPLOCK;
148 sconn->oplocks.exclusive_open--;
149 sconn->oplocks.level_II_open++;
150 fsp->sent_oplock_break = NO_BREAK_SENT;
151
152 flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
153 delete_write_cache(fsp);
154
155 TALLOC_FREE(fsp->oplock_timeout);
156 }
157
158 uint32_t get_lease_type(const struct share_mode_data *d,
159 const struct share_mode_entry *e)
160 {
161 if (e->op_type == LEASE_OPLOCK) {
162 return d->leases[e->lease_idx].current_state;
163 }
164 return map_oplock_to_lease_type(e->op_type);
165 }
166
167 bool update_num_read_oplocks(files_struct *fsp, struct share_mode_lock *lck)
168 {
169 struct share_mode_data *d = lck->data;
170 struct byte_range_lock *br_lck;
171 uint32_t num_read_oplocks = 0;
172 uint32_t i;
173
174 if (fsp_lease_type_is_exclusive(fsp)) {
175 const struct share_mode_entry *e = NULL;
176 uint32_t e_lease_type = 0;
177
178 /*
179 * If we're fully exclusive, we don't need a brlock entry
180 */
181 remove_stale_share_mode_entries(d);
182
183 e = find_share_mode_entry(lck, fsp);
184 if (e != NULL) {
185 e_lease_type = get_lease_type(d, e);
186 }
187
188 if (!lease_type_is_exclusive(e_lease_type)) {
189 char *timestr = NULL;
190
191 timestr = timeval_string(talloc_tos(),
192 &fsp->open_time,
193 true);
194
195 NDR_PRINT_DEBUG(share_mode_data, d);
196 DBG_ERR("file [%s] file_id [%s] gen_id [%lu] "
197 "open_time[%s] lease_type [0x%x] "
198 "oplock_type [0x%x]\n",
199 fsp_str_dbg(fsp),
200 file_id_string_tos(&fsp->file_id),
201 fsp->fh->gen_id, timestr,
202 e_lease_type, fsp->oplock_type);
203
204 smb_panic("Found non-exclusive lease");
205 }
206
207 return true;
208 }
209
210 for (i=0; i<d->num_share_modes; i++) {
211 struct share_mode_entry *e = &d->share_modes[i];
212 uint32_t e_lease_type = get_lease_type(d, e);
213
214 if (e_lease_type & SMB2_LEASE_READ) {
215 num_read_oplocks += 1;
216 }
217 }
218
219 br_lck = brl_get_locks_readonly(fsp);
220 if (br_lck == NULL) {
221 return false;
222 }
223 if (brl_num_read_oplocks(br_lck) == num_read_oplocks) {
224 return true;
225 }
226
227 br_lck = brl_get_locks(talloc_tos(), fsp);
228 if (br_lck == NULL) {
229 return false;
230 }
231 brl_set_num_read_oplocks(br_lck, num_read_oplocks);
232 TALLOC_FREE(br_lck);
233 return true;
234 }
235
236 /****************************************************************************
237 Remove a file oplock with lock already held. Copes with level II and exclusive.
238 ****************************************************************************/
239
240 bool remove_oplock_under_lock(files_struct *fsp, struct share_mode_lock *lck)
241 {
242 bool ret;
243
244 ret = remove_share_oplock(lck, fsp);
245 if (!ret) {
246 DBG_ERR("failed to remove share oplock for "
247 "file %s, %s, %s\n",
248 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
249 file_id_string_tos(&fsp->file_id));
250 }
251 release_file_oplock(fsp);
252
253 ret = update_num_read_oplocks(fsp, lck);
254 if (!ret) {
255 DBG_ERR("update_num_read_oplocks failed for "
256 "file %s, %s, %s\n",
257 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
258 file_id_string_tos(&fsp->file_id));
259 }
260
261 return ret;
262 }
263
264 /****************************************************************************
265 Remove a file oplock. Copes with level II and exclusive.
266 Locks then unlocks the share mode lock. Client can decide to go directly
267 to none even if a "break-to-level II" was sent.
268 ****************************************************************************/
269
270 bool remove_oplock(files_struct *fsp)
271 {
272 bool ret;
273 struct share_mode_lock *lck;
274
275 DBG_DEBUG("remove_oplock called for %s\n", fsp_str_dbg(fsp));
276
277 /* Remove the oplock flag from the sharemode. */
278 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
279 if (lck == NULL) {
280 DBG_ERR("failed to lock share entry for "
281 "file %s\n", fsp_str_dbg(fsp));
282 return false;
283 }
284
285 ret = remove_oplock_under_lock(fsp, lck);
286
287 TALLOC_FREE(lck);
288 return ret;
289 }
290
291 /*
292 * Deal with a reply when a break-to-level II was sent.
293 */
294 bool downgrade_oplock(files_struct *fsp)
295 {
296 bool ret;
297 struct share_mode_lock *lck;
298
299 DEBUG(10, ("downgrade_oplock called for %s\n",
300 fsp_str_dbg(fsp)));
301
302 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
303 if (lck == NULL) {
304 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
305 "file %s\n", fsp_str_dbg(fsp)));
306 return False;
307 }
308 ret = downgrade_share_oplock(lck, fsp);
309 if (!ret) {
310 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
311 "for file %s, %s, file_id %s\n",
312 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
313 file_id_string_tos(&fsp->file_id)));
314 }
315 downgrade_file_oplock(fsp);
316
317 ret = update_num_read_oplocks(fsp, lck);
318 if (!ret) {
319 DEBUG(0, ("%s: update_num_read_oplocks failed for "
320 "file %s, %s, %s\n",
321 __func__, fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
322 file_id_string_tos(&fsp->file_id)));
323 }
324
325 TALLOC_FREE(lck);
326 return ret;
327 }
328
329 static void lease_timeout_handler(struct tevent_context *ctx,
330 struct tevent_timer *te,
331 struct timeval now,
332 void *private_data)
333 {
334 struct fsp_lease *lease =
335 talloc_get_type_abort(private_data,
336 struct fsp_lease);
337 struct files_struct *fsp;
338 struct share_mode_lock *lck;
339 uint16_t old_epoch = lease->lease.lease_epoch;
340
341 fsp = file_find_one_fsp_from_lease_key(lease->sconn,
342 &lease->lease.lease_key);
343 if (fsp == NULL) {
344 /* race? */
345 TALLOC_FREE(lease->timeout);
346 return;
347 }
348
349 lck = get_existing_share_mode_lock(
350 talloc_tos(), fsp->file_id);
351 if (lck == NULL) {
352 /* race? */
353 TALLOC_FREE(lease->timeout);
354 return;
355 }
356
357 fsp_lease_update(lck, fsp_client_guid(fsp), lease);
358
359 if (lease->lease.lease_epoch != old_epoch) {
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 (epoch) for file %s - ignoring\n",
365 fsp_str_dbg(fsp)));
366 TALLOC_FREE(lck);
367 return;
368 }
369
370 if (!(lease->lease.lease_flags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)) {
371 /*
372 * If the epoch changed we need to wait for
373 * the next timeout to happen.
374 */
375 DEBUG(10, ("lease break timeout race (flags) for file %s - ignoring\n",
376 fsp_str_dbg(fsp)));
377 TALLOC_FREE(lck);
378 return;
379 }
380
381 DEBUG(1, ("lease break timed out for file %s -- replying anyway\n",
382 fsp_str_dbg(fsp)));
383 (void)downgrade_lease(lease->sconn->client->connections,
384 1,
385 &fsp->file_id,
386 &lease->lease.lease_key,
387 SMB2_LEASE_NONE);
388
389 TALLOC_FREE(lck);
390 }
391
392 bool fsp_lease_update(struct share_mode_lock *lck,
393 const struct GUID *client_guid,
394 struct fsp_lease *lease)
395 {
396 struct share_mode_data *d = lck->data;
397 int idx;
398 struct share_mode_lease *l = NULL;
399
400 idx = find_share_mode_lease(d, client_guid, &lease->lease.lease_key);
401 if (idx != -1) {
402 l = &d->leases[idx];
403 }
404
405 if (l == NULL) {
406 DEBUG(1, ("%s: Could not find lease entry\n", __func__));
407 TALLOC_FREE(lease->timeout);
408 lease->lease.lease_state = SMB2_LEASE_NONE;
409 lease->lease.lease_epoch += 1;
410 lease->lease.lease_flags = 0;
411 return false;
412 }
413
414 DEBUG(10,("%s: refresh lease state\n", __func__));
415
416 /* Ensure we're in sync with current lease state. */
417 if (lease->lease.lease_epoch != l->epoch) {
418 DEBUG(10,("%s: cancel outdated timeout\n", __func__));
419 TALLOC_FREE(lease->timeout);
420 }
421 lease->lease.lease_epoch = l->epoch;
422 lease->lease.lease_state = l->current_state;
423
424 if (l->breaking) {
425 lease->lease.lease_flags |= SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
426
427 if (lease->timeout == NULL) {
428 struct timeval t = timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0);
429
430 DEBUG(10,("%s: setup timeout handler\n", __func__));
431
432 lease->timeout = tevent_add_timer(lease->sconn->ev_ctx,
433 lease, t,
434 lease_timeout_handler,
435 lease);
436 if (lease->timeout == NULL) {
437 DEBUG(0, ("%s: Could not add lease timeout handler\n",
438 __func__));
439 }
440 }
441 } else {
442 lease->lease.lease_flags &= ~SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
443 TALLOC_FREE(lease->timeout);
444 }
445
446 return true;
447 }
448
449 struct downgrade_lease_additional_state {
450 struct tevent_immediate *im;
451 struct smbXsrv_connection *xconn;
452 uint32_t break_flags;
453 struct smb2_lease_key lease_key;
454 uint32_t break_from;
455 uint32_t break_to;
456 uint16_t new_epoch;
457 };
458
459 static void downgrade_lease_additional_trigger(struct tevent_context *ev,
460 struct tevent_immediate *im,
461 void *private_data)
462 {
463 struct downgrade_lease_additional_state *state =
464 talloc_get_type_abort(private_data,
465 struct downgrade_lease_additional_state);
466 struct smbXsrv_connection *xconn = state->xconn;
467 NTSTATUS status;
468
469 status = smbd_smb2_send_lease_break(xconn,
470 state->new_epoch,
471 state->break_flags,
472 &state->lease_key,
473 state->break_from,
474 state->break_to);
475 TALLOC_FREE(state);
476 if (!NT_STATUS_IS_OK(status)) {
477 smbd_server_connection_terminate(xconn,
478 nt_errstr(status));
479 return;
480 }
481 }
482
483 struct downgrade_lease_fsps_state {
484 struct file_id id;
485 struct share_mode_lock *lck;
486 const struct smb2_lease_key *key;
487 };
488
489 static struct files_struct *downgrade_lease_fsps(struct files_struct *fsp,
490 void *private_data)
491 {
492 struct downgrade_lease_fsps_state *state =
493 (struct downgrade_lease_fsps_state *)private_data;
494
495 if (fsp->oplock_type != LEASE_OPLOCK) {
496 return NULL;
497 }
498 if (!smb2_lease_key_equal(&fsp->lease->lease.lease_key, state->key)) {
499 return NULL;
500 }
501 if (!file_id_equal(&fsp->file_id, &state->id)) {
502 return NULL;
503 }
504
505 fsp_lease_update(state->lck, fsp_client_guid(fsp), fsp->lease);
506
507 return NULL;
508 }
509
510 NTSTATUS downgrade_lease(struct smbXsrv_connection *xconn,
511 uint32_t num_file_ids,
512 const struct file_id *ids,
513 const struct smb2_lease_key *key,
514 uint32_t lease_state)
515 {
516 struct smbd_server_connection *sconn = xconn->client->sconn;
517 struct share_mode_lock *lck;
518 struct share_mode_lease *l = NULL;
519 const struct file_id id = ids[0];
520 uint32_t i;
521 NTSTATUS status;
522
523 DEBUG(10, ("%s: Downgrading %s to %x\n", __func__,
524 file_id_string_tos(&id), (unsigned)lease_state));
525
526 lck = get_existing_share_mode_lock(talloc_tos(), id);
527 if (lck == NULL) {
528 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
529 }
530 status = downgrade_share_lease(sconn, lck, key, lease_state, &l);
531
532 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
533 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
534
535 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
536 struct downgrade_lease_additional_state *state;
537
538 state = talloc_zero(xconn,
539 struct downgrade_lease_additional_state);
540 if (state == NULL) {
541 TALLOC_FREE(lck);
542 return NT_STATUS_NO_MEMORY;
543 }
544
545 state->im = tevent_create_immediate(state);
546 if (state->im == NULL) {
547 TALLOC_FREE(state);
548 TALLOC_FREE(lck);
549 return NT_STATUS_NO_MEMORY;
550 }
551
552 state->xconn = xconn;
553 if (l->current_state & (~SMB2_LEASE_READ)) {
554 state->break_flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
555 }
556 state->lease_key = l->lease_key;
557 state->break_from = l->current_state;
558 state->break_to = l->breaking_to_requested;
559 if (l->lease_version > 1) {
560 state->new_epoch = l->epoch;
561 }
562
563 if (state->break_flags == 0) {
564 /*
565 * This is an async break without
566 * SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED
567 *
568 * we need to store NONE state in the
569 * database.
570 */
571 l->current_state = 0;
572 l->breaking_to_requested = 0;
573 l->breaking_to_required = 0;
574 l->breaking = false;
575
576 lck->data->modified = true;
577 }
578
579 tevent_schedule_immediate(state->im, xconn->ev_ctx,
580 downgrade_lease_additional_trigger,
581 state);
582 }
583
584 {
585 struct downgrade_lease_fsps_state state = {
586 .id = id, .lck = lck, .key = key,
587 };
588
589 files_forall(sconn, downgrade_lease_fsps, &state);
590 }
591
592 TALLOC_FREE(lck);
593 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
594 file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
595
596 /*
597 * Dynamic share case. Ensure other opens are copies.
598 * This will only be breaking to NONE.
599 */
600
601 for (i = 1; i < num_file_ids; i++) {
602 lck = get_existing_share_mode_lock(talloc_tos(), ids[i]);
603 if (lck == NULL) {
604 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
605 }
606
607 {
608 struct downgrade_lease_fsps_state state = {
609 .id = ids[i], .lck = lck, .key = key,
610 };
611
612 files_forall(sconn, downgrade_lease_fsps, &state);
613 }
614
615 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
616 file_id_string_tos(&ids[i]), (unsigned)lease_state, nt_errstr(status)));
617
618 TALLOC_FREE(lck);
619 }
620
621 return status;
622 }
623
624 /****************************************************************************
625 Set up an oplock break message.
626 ****************************************************************************/
627
628 #define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
629
630 static void new_break_message_smb1(files_struct *fsp, int cmd,
631 char result[SMB1_BREAK_MESSAGE_LENGTH])
632 {
633 memset(result,'\0',smb_size);
634 srv_set_message(result,8,0,true);
635 SCVAL(result,smb_com,SMBlockingX);
636 SSVAL(result,smb_tid,fsp->conn->cnum);
637 SSVAL(result,smb_pid,0xFFFF);
638 SSVAL(result,smb_uid,0);
639 SSVAL(result,smb_mid,0xFFFF);
640 SCVAL(result,smb_vwv0,0xFF);
641 SSVAL(result,smb_vwv2,fsp->fnum);
642 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
643 SCVAL(result,smb_vwv3+1,cmd);
644 }
645
646 /****************************************************************************
647 Function to do the waiting before sending a local break.
648 ****************************************************************************/
649
650 static void wait_before_sending_break(void)
651 {
652 long wait_time = (long)lp_oplock_break_wait_time();
653
654 if (wait_time) {
655 smb_msleep(wait_time);
656 }
657 }
658
659 /****************************************************************************
660 Ensure that we have a valid oplock.
661 ****************************************************************************/
662
663 static files_struct *initial_break_processing(
664 struct smbd_server_connection *sconn, struct file_id id,
665 unsigned long file_id)
666 {
667 files_struct *fsp = NULL;
668
669 DEBUG(3, ("initial_break_processing: called for %s/%u\n"
670 "Current oplocks_open (exclusive = %d, levelII = %d)\n",
671 file_id_string_tos(&id), (int)file_id,
672 sconn->oplocks.exclusive_open,
673 sconn->oplocks.level_II_open));
674
675 /*
676 * We need to search the file open table for the
677 * entry containing this dev and inode, and ensure
678 * we have an oplock on it.
679 */
680
681 fsp = file_find_dif(sconn, id, file_id);
682
683 if(fsp == NULL) {
684 /* The file could have been closed in the meantime - return success. */
685 DEBUG(3, ("initial_break_processing: cannot find open file "
686 "with file_id %s gen_id = %lu, allowing break to "
687 "succeed.\n", file_id_string_tos(&id), file_id));
688 return NULL;
689 }
690
691 /* Ensure we have an oplock on the file */
692
693 /*
694 * There is a potential race condition in that an oplock could
695 * have been broken due to another udp request, and yet there are
696 * still oplock break messages being sent in the udp message
697 * queue for this file. So return true if we don't have an oplock,
698 * as we may have just freed it.
699 */
700
701 if(fsp->oplock_type == NO_OPLOCK) {
702 DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
703 "gen_id = %lu) has no oplock. Allowing break to "
704 "succeed regardless.\n", fsp_str_dbg(fsp),
705 file_id_string_tos(&id), fsp->fh->gen_id));
706 return NULL;
707 }
708
709 return fsp;
710 }
711
712 static void oplock_timeout_handler(struct tevent_context *ctx,
713 struct tevent_timer *te,
714 struct timeval now,
715 void *private_data)
716 {
717 files_struct *fsp = (files_struct *)private_data;
718
719 SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
720
721 /* Remove the timed event handler. */
722 TALLOC_FREE(fsp->oplock_timeout);
723 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
724 fsp_str_dbg(fsp)));
725 remove_oplock(fsp);
726 }
727
728 /*******************************************************************
729 Add a timeout handler waiting for the client reply.
730 *******************************************************************/
731
732 static void add_oplock_timeout_handler(files_struct *fsp)
733 {
734 struct smbd_server_connection *sconn = fsp->conn->sconn;
735 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
736 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
737 (koplocks != NULL);
738
739 /*
740 * If kernel oplocks already notifies smbds when an oplock break times
741 * out, just return.
742 */
743 if (use_kernel &&
744 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
745 return;
746 }
747
748 if (fsp->oplock_timeout != NULL) {
749 DEBUG(0, ("Logic problem -- have an oplock event hanging "
750 "around\n"));
751 }
752
753 fsp->oplock_timeout =
754 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
755 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
756 oplock_timeout_handler, fsp);
757
758 if (fsp->oplock_timeout == NULL) {
759 DEBUG(0, ("Could not add oplock timeout handler\n"));
760 }
761 }
762
763 static void send_break_message_smb1(files_struct *fsp, int level)
764 {
765 struct smbXsrv_connection *xconn = NULL;
766 char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
767
768 /*
769 * For SMB1 we only have one connection
770 */
771 xconn = fsp->conn->sconn->client->connections;
772
773 new_break_message_smb1(fsp, level, break_msg);
774
775 show_msg(break_msg);
776 if (!srv_send_smb(xconn,
777 break_msg, false, 0,
778 IS_CONN_ENCRYPTED(fsp->conn),
779 NULL)) {
780 exit_server_cleanly("send_break_message_smb1: "
781 "srv_send_smb failed.");
782 }
783 }
784
785 /*******************************************************************
786 This handles the generic oplock break message from another smbd.
787 *******************************************************************/
788
789 static void process_oplock_break_message(struct messaging_context *msg_ctx,
790 void *private_data,
791 uint32_t msg_type,
792 struct server_id src,
793 DATA_BLOB *data)
794 {
795 struct share_mode_entry msg;
796 files_struct *fsp;
797 bool use_kernel;
798 struct smbd_server_connection *sconn =
799 talloc_get_type_abort(private_data,
800 struct smbd_server_connection);
801 struct server_id self = messaging_server_id(sconn->msg_ctx);
802 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
803 uint16_t break_from;
804 uint16_t break_to;
805 bool break_needed = true;
806 struct server_id_buf tmp;
807
808 if (data->data == NULL) {
809 DEBUG(0, ("Got NULL buffer\n"));
810 return;
811 }
812
813 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
814 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
815 return;
816 }
817
818 /* De-linearize incoming message. */
819 message_to_share_mode_entry(&msg, (char *)data->data);
820 break_to = msg.op_type;
821
822 DEBUG(10, ("Got oplock break to %u message from pid %s: %s/%llu\n",
823 (unsigned)break_to, server_id_str_buf(src, &tmp),
824 file_id_string_tos(&msg.id),
825 (unsigned long long)msg.share_file_id));
826
827 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
828
829 if (fsp == NULL) {
830 /* We hit a race here. Break messages are sent, and before we
831 * get to process this message, we have closed the file. */
832 DEBUG(3, ("Did not find fsp\n"));
833 return;
834 }
835
836 break_from = fsp_lease_type(fsp);
837
838 if (fsp->oplock_type != LEASE_OPLOCK) {
839 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
840 /*
841 * Nothing to do anymore
842 */
843 DEBUG(10, ("fsp->sent_oplock_break = %d\n",
844 fsp->sent_oplock_break));
845 return;
846 }
847 }
848
849 if (!(global_client_caps & CAP_LEVEL_II_OPLOCKS)) {
850 DEBUG(10, ("client_caps without level2 oplocks\n"));
851 break_to &= ~SMB2_LEASE_READ;
852 }
853
854 use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
855 (koplocks != NULL);
856 if (use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
857 DEBUG(10, ("Kernel oplocks don't allow level2\n"));
858 break_to &= ~SMB2_LEASE_READ;
859 }
860
861 if (!lp_level2_oplocks(SNUM(fsp->conn))) {
862 DEBUG(10, ("no level2 oplocks by config\n"));
863 break_to &= ~SMB2_LEASE_READ;
864 }
865
866 if (fsp->oplock_type == LEASE_OPLOCK) {
867 struct share_mode_lock *lck;
868 int idx;
869
870 lck = get_existing_share_mode_lock(
871 talloc_tos(), fsp->file_id);
872 if (lck == NULL) {
873 /*
874 * We hit a race here. Break messages are sent, and
875 * before we get to process this message, we have closed
876 * the file.
877 */
878 DEBUG(3, ("Did not find share_mode\n"));
879 return;
880 }
881
882 idx = find_share_mode_lease(
883 lck->data,
884 fsp_client_guid(fsp),
885 &fsp->lease->lease.lease_key);
886 if (idx != -1) {
887 struct share_mode_lease *l;
888 l = &lck->data->leases[idx];
889
890 break_from = l->current_state;
891 break_to &= l->current_state;
892
893 if (l->breaking) {
894 break_to &= l->breaking_to_required;
895 if (l->breaking_to_required != break_to) {
896 /*
897 * Note we don't increment the epoch
898 * here, which might be a bug in
899 * Windows too...
900 */
901 l->breaking_to_required = break_to;
902 lck->data->modified = true;
903 }
904 break_needed = false;
905 } else if (l->current_state == break_to) {
906 break_needed = false;
907 } else if (l->current_state == SMB2_LEASE_READ) {
908 l->current_state = SMB2_LEASE_NONE;
909 /* Need to increment the epoch */
910 l->epoch += 1;
911 lck->data->modified = true;
912 } else {
913 l->breaking = true;
914 l->breaking_to_required = break_to;
915 l->breaking_to_requested = break_to;
916 /* Need to increment the epoch */
917 l->epoch += 1;
918 lck->data->modified = true;
919 }
920
921 /* Ensure we're in sync with current lease state. */
922 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
923 }
924
925 TALLOC_FREE(lck);
926 }
927
928 if (!break_needed) {
929 DEBUG(10,("%s: skip break\n", __func__));
930 return;
931 }
932
933 if ((break_from == SMB2_LEASE_NONE) && !break_needed) {
934 DEBUG(3, ("Already downgraded oplock to none on %s: %s\n",
935 file_id_string_tos(&fsp->file_id),
936 fsp_str_dbg(fsp)));
937 return;
938 }
939
940 DEBUG(10, ("break_from=%u, break_to=%u\n",
941 (unsigned)break_from, (unsigned)break_to));
942
943 if ((break_from == break_to) && !break_needed) {
944 DEBUG(3, ("Already downgraded oplock to %u on %s: %s\n",
945 (unsigned)break_to,
946 file_id_string_tos(&fsp->file_id),
947 fsp_str_dbg(fsp)));
948 return;
949 }
950
951 /* Need to wait before sending a break
952 message if we sent ourselves this message. */
953 if (serverid_equal(&self, &src)) {
954 wait_before_sending_break();
955 }
956
957 if (sconn->using_smb2) {
958 send_break_message_smb2(fsp, break_from, break_to);
959 } else {
960 send_break_message_smb1(fsp, (break_to & SMB2_LEASE_READ) ?
961 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
962 }
963
964 if ((break_from == SMB2_LEASE_READ) &&
965 (break_to == SMB2_LEASE_NONE)) {
966 /*
967 * This is an async break without a reply and thus no timeout
968 *
969 * leases are handled above.
970 */
971 if (fsp->oplock_type != LEASE_OPLOCK) {
972 remove_oplock(fsp);
973 }
974 return;
975 }
976 if (fsp->oplock_type == LEASE_OPLOCK) {
977 return;
978 }
979
980 fsp->sent_oplock_break = (break_to & SMB2_LEASE_READ) ?
981 LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
982
983 add_oplock_timeout_handler(fsp);
984 }
985
986 /*******************************************************************
987 This handles the kernel oplock break message.
988 *******************************************************************/
989
990 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
991 void *private_data,
992 uint32_t msg_type,
993 struct server_id src,
994 DATA_BLOB *data)
995 {
996 struct file_id id;
997 unsigned long file_id;
998 files_struct *fsp;
999 struct smbd_server_connection *sconn =
1000 talloc_get_type_abort(private_data,
1001 struct smbd_server_connection);
1002 struct server_id_buf tmp;
1003
1004 if (data->data == NULL) {
1005 DEBUG(0, ("Got NULL buffer\n"));
1006 return;
1007 }
1008
1009 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
1010 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
1011 return;
1012 }
1013
1014 /* Pull the data from the message. */
1015 pull_file_id_24((char *)data->data, &id);
1016 file_id = (unsigned long)IVAL(data->data, 24);
1017
1018 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
1019 server_id_str_buf(src, &tmp), file_id_string_tos(&id),
1020 (unsigned int)file_id));
1021
1022 fsp = initial_break_processing(sconn, id, file_id);
1023
1024 if (fsp == NULL) {
1025 DEBUG(3, ("Got a kernel oplock break message for a file "
1026 "I don't know about\n"));
1027 return;
1028 }
1029
1030 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
1031 /* This is ok, kernel oplocks come in completely async */
1032 DEBUG(3, ("Got a kernel oplock request while waiting for a "
1033 "break reply\n"));
1034 return;
1035 }
1036
1037 if (sconn->using_smb2) {
1038 send_break_message_smb2(fsp, 0, OPLOCKLEVEL_NONE);
1039 } else {
1040 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
1041 }
1042
1043 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
1044
1045 add_oplock_timeout_handler(fsp);
1046 }
1047
1048 struct break_to_none_state {
1049 struct smbd_server_connection *sconn;
1050 struct file_id id;
1051 struct smb2_lease_key lease_key;
1052 struct GUID client_guid;
1053 };
1054 static void do_break_to_none(struct tevent_context *ctx,
1055 struct tevent_immediate *im,
1056 void *private_data);
1057
1058 /****************************************************************************
1059 This function is called on any file modification or lock request. If a file
1060 is level 2 oplocked then it must tell all other level 2 holders to break to
1061 none.
1062 ****************************************************************************/
1063
1064 static void contend_level2_oplocks_begin_default(files_struct *fsp,
1065 enum level2_contention_type type)
1066 {
1067 struct smbd_server_connection *sconn = fsp->conn->sconn;
1068 struct tevent_immediate *im;
1069 struct break_to_none_state *state;
1070 struct byte_range_lock *brl;
1071 uint32_t num_read_oplocks = 0;
1072
1073 /*
1074 * If this file is level II oplocked then we need
1075 * to grab the shared memory lock and inform all
1076 * other files with a level II lock that they need
1077 * to flush their read caches. We keep the lock over
1078 * the shared memory area whilst doing this.
1079 */
1080
1081 if (fsp_lease_type_is_exclusive(fsp)) {
1082 /*
1083 * There can't be any level2 oplocks, we're alone.
1084 */
1085 return;
1086 }
1087
1088 brl = brl_get_locks_readonly(fsp);
1089 if (brl != NULL) {
1090 num_read_oplocks = brl_num_read_oplocks(brl);
1091 }
1092
1093 DEBUG(10, ("num_read_oplocks = %"PRIu32"\n", num_read_oplocks));
1094
1095 if (num_read_oplocks == 0) {
1096 DEBUG(10, ("No read oplocks around\n"));
1097 return;
1098 }
1099
1100 /*
1101 * When we get here we might have a brlock entry locked. Also
1102 * locking the share mode entry would violate the locking
1103 * order. Breaking level2 oplocks to none is asynchronous
1104 * anyway, so we postpone this into an immediate event.
1105 */
1106
1107 state = talloc_zero(sconn, struct break_to_none_state);
1108 if (state == NULL) {
1109 DEBUG(1, ("talloc failed\n"));
1110 return;
1111 }
1112 state->sconn = sconn;
1113 state->id = fsp->file_id;
1114
1115 if (fsp->oplock_type == LEASE_OPLOCK) {
1116 state->client_guid = *fsp_client_guid(fsp);
1117 state->lease_key = fsp->lease->lease.lease_key;
1118 DEBUG(10, ("Breaking through lease key %"PRIu64"/%"PRIu64"\n",
1119 state->lease_key.data[0],
1120 state->lease_key.data[1]));
1121 }
1122
1123 im = tevent_create_immediate(state);
1124 if (im == NULL) {
1125 DEBUG(1, ("tevent_create_immediate failed\n"));
1126 TALLOC_FREE(state);
1127 return;
1128 }
1129 tevent_schedule_immediate(im, sconn->ev_ctx, do_break_to_none, state);
1130 }
1131
1132 static void send_break_to_none(struct messaging_context *msg_ctx,
1133 const struct share_mode_entry *e)
1134 {
1135 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1136
1137 share_mode_entry_to_message(msg, e);
1138 /* Overload entry->op_type */
1139 SSVAL(msg, OP_BREAK_MSG_OP_TYPE_OFFSET, NO_OPLOCK);
1140
1141 messaging_send_buf(msg_ctx, e->pid, MSG_SMB_BREAK_REQUEST,
1142 (uint8_t *)msg, sizeof(msg));
1143 }
1144
1145 static void do_break_to_none(struct tevent_context *ctx,
1146 struct tevent_immediate *im,
1147 void *private_data)
1148 {
1149 struct break_to_none_state *state = talloc_get_type_abort(
1150 private_data, struct break_to_none_state);
1151 uint32_t i;
1152 struct share_mode_lock *lck;
1153 struct share_mode_data *d;
1154
1155 lck = get_existing_share_mode_lock(talloc_tos(), state->id);
1156 if (lck == NULL) {
1157 DEBUG(1, ("%s: failed to lock share mode entry for file %s.\n",
1158 __func__, file_id_string_tos(&state->id)));
1159 goto done;
1160 }
1161 d = lck->data;
1162
1163 /*
1164 * Walk leases and oplocks separately: We have to send one break per
1165 * lease. If we have multiple share_mode_entry having a common lease,
1166 * we would break the lease twice if we don't walk the leases list
1167 * separately.
1168 */
1169
1170 for (i=0; i<d->num_leases; i++) {
1171 struct share_mode_lease *l = &d->leases[i];
1172 struct share_mode_entry *e = NULL;
1173 uint32_t j;
1174
1175 if ((l->current_state & SMB2_LEASE_READ) == 0) {
1176 continue;
1177 }
1178 if (smb2_lease_equal(&state->client_guid,
1179 &state->lease_key,
1180 &l->client_guid,
1181 &l->lease_key)) {
1182 DEBUG(10, ("Don't break our own lease\n"));
1183 continue;
1184 }
1185
1186 for (j=0; j<d->num_share_modes; j++) {
1187 e = &d->share_modes[j];
1188
1189 if (!is_valid_share_mode_entry(e)) {
1190 continue;
1191 }
1192 if (e->lease_idx == i) {
1193 break;
1194 }
1195 }
1196 if (j == d->num_share_modes) {
1197 DEBUG(0, ("leases[%"PRIu32"] has no share mode\n",
1198 i));
1199 continue;
1200 }
1201
1202 DEBUG(10, ("Breaking lease# %"PRIu32" with share_entry# "
1203 "%"PRIu32"\n", i, j));
1204
1205 send_break_to_none(state->sconn->msg_ctx, e);
1206 }
1207
1208 for(i = 0; i < d->num_share_modes; i++) {
1209 struct share_mode_entry *e = &d->share_modes[i];
1210
1211 if (!is_valid_share_mode_entry(e)) {
1212 continue;
1213 }
1214 if (e->op_type == LEASE_OPLOCK) {
1215 /*
1216 * Took care of those in the loop above
1217 */
1218 continue;
1219 }
1220
1221 /*
1222 * As there could have been multiple writes waiting at the
1223 * lock_share_entry gate we may not be the first to
1224 * enter. Hence the state of the op_types in the share mode
1225 * entries may be partly NO_OPLOCK and partly LEVEL_II
1226 * oplock. It will do no harm to re-send break messages to
1227 * those smbd's that are still waiting their turn to remove
1228 * their LEVEL_II state, and also no harm to ignore existing
1229 * NO_OPLOCK states. JRA.
1230 */
1231
1232 DEBUG(10, ("%s: share_entry[%i]->op_type == %d\n", __func__,
1233 i, e->op_type ));
1234
1235 if (e->op_type == NO_OPLOCK) {
1236 continue;
1237 }
1238
1239 /* Paranoia .... */
1240 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1241 DEBUG(0,("%s: PANIC. "
1242 "share mode entry %d is an exclusive "
1243 "oplock !\n", __func__, i ));
1244 TALLOC_FREE(lck);
1245 abort();
1246 }
1247
1248 send_break_to_none(state->sconn->msg_ctx, e);
1249 }
1250
1251 /* We let the message receivers handle removing the oplock state
1252 in the share mode lock db. */
1253
1254 TALLOC_FREE(lck);
1255 done:
1256 TALLOC_FREE(state);
1257 return;
1258 }
1259
1260 void smbd_contend_level2_oplocks_begin(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 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
1266 (koplocks != NULL);
1267
1268 if (use_kernel && koplocks->ops->contend_level2_oplocks_begin) {
1269 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
1270 return;
1271 }
1272
1273 contend_level2_oplocks_begin_default(fsp, type);
1274 }
1275
1276 void smbd_contend_level2_oplocks_end(files_struct *fsp,
1277 enum level2_contention_type type)
1278 {
1279 struct smbd_server_connection *sconn = fsp->conn->sconn;
1280 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1281 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
1282 (koplocks != NULL);
1283
1284 /* Only kernel oplocks implement this so far */
1285 if (use_kernel && koplocks->ops->contend_level2_oplocks_end) {
1286 koplocks->ops->contend_level2_oplocks_end(fsp, type);
1287 }
1288 }
1289
1290 /****************************************************************************
1291 Linearize a share mode entry struct to an internal oplock break message.
1292 ****************************************************************************/
1293
1294 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
1295 {
1296 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32_t)e->pid.pid);
1297 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
1298 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
1299 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
1300 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
1301 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
1302 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
1303 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
1304 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1305 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
1306 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
1307 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
1308 SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
1309 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
1310 }
1311
1312 /****************************************************************************
1313 De-linearize an internal oplock break message to a share mode entry struct.
1314 ****************************************************************************/
1315
1316 void message_to_share_mode_entry(struct share_mode_entry *e, const char *msg)
1317 {
1318 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
1319 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
1320 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
1321 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
1322 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
1323 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
1324 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
1325 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
1326 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
1327 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
1328 e->uid = (uint32_t)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
1329 e->flags = (uint16_t)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
1330 e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
1331 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
1332 }
1333
1334 /****************************************************************************
1335 Setup oplocks for this process.
1336 ****************************************************************************/
1337
1338 bool init_oplocks(struct smbd_server_connection *sconn)
1339 {
1340 DEBUG(3,("init_oplocks: initializing messages.\n"));
1341
1342 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
1343 process_oplock_break_message);
1344 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
1345 process_kernel_oplock_break);
1346 return true;
1347 }
1348
1349 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1350 {
1351 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1352
1353 /* only initialize once */
1354 if (koplocks == NULL) {
1355 #if HAVE_KERNEL_OPLOCKS_IRIX
1356 koplocks = irix_init_kernel_oplocks(sconn);
1357 #elif HAVE_KERNEL_OPLOCKS_LINUX
1358 koplocks = linux_init_kernel_oplocks(sconn);
1359 #endif
1360 sconn->oplocks.kernel_ops = koplocks;
1361 }
1362 }
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