?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dnsp: Parse TXT records
[Samba/gebeck_regimport.git] / source3 / smbd / oplock.c
blobc632e8a0f2dc90732d90ff8636206dbbf61bce15
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/globals.h"
25 #include "librpc/gen_ndr/messaging.h"
26
27 /****************************************************************************
28 Get the number of current exclusive oplocks.
29 ****************************************************************************/
30
31 int32 get_number_of_exclusive_open_oplocks(void)
32 {
33 return exclusive_oplocks_open;
34 }
35
36 /*
37 * helper function used by the kernel oplock backends to post the break message
38 */
39 void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
40 {
41 uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
42
43 /* Put the kernel break info into the message. */
44 push_file_id_24((char *)msg, &fsp->file_id);
45 SIVAL(msg,24,fsp->fh->gen_id);
46
47 /* Don't need to be root here as we're only ever
48 sending to ourselves. */
49
50 messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
51 MSG_SMB_KERNEL_BREAK,
52 msg, MSG_SMB_KERNEL_BREAK_SIZE);
53 }
54
55 /****************************************************************************
56 Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
57 disabled (just sets flags). Returns True if oplock set.
58 ****************************************************************************/
59
60 bool set_file_oplock(files_struct *fsp, int oplock_type)
61 {
62 if ((fsp->oplock_type == LEVEL_II_OPLOCK)
63 && koplocks && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
64 DEBUG(10, ("Refusing level2 oplock, kernel oplocks don't "
65 "support them\n"));
66 return false;
67 }
68 if ((fsp->oplock_type != NO_OPLOCK) &&
69 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
70 koplocks &&
71 !koplocks->ops->set_oplock(koplocks, fsp, oplock_type)) {
72 return False;
73 }
74
75 fsp->oplock_type = oplock_type;
76 fsp->sent_oplock_break = NO_BREAK_SENT;
77 if (oplock_type == LEVEL_II_OPLOCK) {
78 level_II_oplocks_open++;
79 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
80 exclusive_oplocks_open++;
81 }
82
83 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
84 "tv_sec = %x, tv_usec = %x\n",
85 fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
86 fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
87 (int)fsp->open_time.tv_usec ));
88
89 return True;
90 }
91
92 /****************************************************************************
93 Attempt to release an oplock on a file. Decrements oplock count.
94 ****************************************************************************/
95
96 void release_file_oplock(files_struct *fsp)
97 {
98 if ((fsp->oplock_type != NO_OPLOCK) &&
99 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
100 koplocks) {
101 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
102 }
103
104 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
105 level_II_oplocks_open--;
106 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
107 exclusive_oplocks_open--;
108 }
109
110 SMB_ASSERT(exclusive_oplocks_open>=0);
111 SMB_ASSERT(level_II_oplocks_open>=0);
112
113 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
114 /* This doesn't matter for close. */
115 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
116 } else {
117 fsp->oplock_type = NO_OPLOCK;
118 }
119 fsp->sent_oplock_break = NO_BREAK_SENT;
120
121 flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
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 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
133 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
134 return;
135 }
136
137 if (koplocks) {
138 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
139 }
140 fsp->oplock_type = LEVEL_II_OPLOCK;
141 exclusive_oplocks_open--;
142 level_II_oplocks_open++;
143 fsp->sent_oplock_break = NO_BREAK_SENT;
144 }
145
146 /****************************************************************************
147 Remove a file oplock. Copes with level II and exclusive.
148 Locks then unlocks the share mode lock. Client can decide to go directly
149 to none even if a "break-to-level II" was sent.
150 ****************************************************************************/
151
152 bool remove_oplock(files_struct *fsp)
153 {
154 bool ret;
155 struct share_mode_lock *lck;
156
157 /* Remove the oplock flag from the sharemode. */
158 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
159 NULL);
160 if (lck == NULL) {
161 DEBUG(0,("remove_oplock: failed to lock share entry for "
162 "file %s\n", fsp_str_dbg(fsp)));
163 return False;
164 }
165 ret = remove_share_oplock(lck, fsp);
166 if (!ret) {
167 DEBUG(0,("remove_oplock: failed to remove share oplock for "
168 "file %s fnum %d, %s\n",
169 fsp_str_dbg(fsp), fsp->fnum,
170 file_id_string_tos(&fsp->file_id)));
171 }
172 release_file_oplock(fsp);
173 TALLOC_FREE(lck);
174 return ret;
175 }
176
177 /*
178 * Deal with a reply when a break-to-level II was sent.
179 */
180 bool downgrade_oplock(files_struct *fsp)
181 {
182 bool ret;
183 struct share_mode_lock *lck;
184
185 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
186 NULL);
187 if (lck == NULL) {
188 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
189 "file %s\n", fsp_str_dbg(fsp)));
190 return False;
191 }
192 ret = downgrade_share_oplock(lck, fsp);
193 if (!ret) {
194 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
195 "for file %s fnum %d, file_id %s\n",
196 fsp_str_dbg(fsp), fsp->fnum,
197 file_id_string_tos(&fsp->file_id)));
198 }
199
200 downgrade_file_oplock(fsp);
201 TALLOC_FREE(lck);
202 return ret;
203 }
204
205 /*
206 * Some kernel oplock implementations handle the notification themselves.
207 */
208 bool should_notify_deferred_opens()
209 {
210 return !(koplocks &&
211 (koplocks->flags & KOPLOCKS_DEFERRED_OPEN_NOTIFICATION));
212 }
213
214 /****************************************************************************
215 Set up an oplock break message.
216 ****************************************************************************/
217
218 static char *new_break_message_smb1(TALLOC_CTX *mem_ctx,
219 files_struct *fsp, int cmd)
220 {
221 char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
222
223 if (result == NULL) {
224 DEBUG(0, ("talloc failed\n"));
225 return NULL;
226 }
227
228 memset(result,'\0',smb_size);
229 srv_set_message(result,8,0,true);
230 SCVAL(result,smb_com,SMBlockingX);
231 SSVAL(result,smb_tid,fsp->conn->cnum);
232 SSVAL(result,smb_pid,0xFFFF);
233 SSVAL(result,smb_uid,0);
234 SSVAL(result,smb_mid,0xFFFF);
235 SCVAL(result,smb_vwv0,0xFF);
236 SSVAL(result,smb_vwv2,fsp->fnum);
237 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
238 SCVAL(result,smb_vwv3+1,cmd);
239 return result;
240 }
241
242 /****************************************************************************
243 Function to do the waiting before sending a local break.
244 ****************************************************************************/
245
246 static void wait_before_sending_break(void)
247 {
248 long wait_time = (long)lp_oplock_break_wait_time();
249
250 if (wait_time) {
251 smb_msleep(wait_time);
252 }
253 }
254
255 /****************************************************************************
256 Ensure that we have a valid oplock.
257 ****************************************************************************/
258
259 static files_struct *initial_break_processing(
260 struct smbd_server_connection *sconn, struct file_id id,
261 unsigned long file_id)
262 {
263 files_struct *fsp = NULL;
264
265 if( DEBUGLVL( 3 ) ) {
266 dbgtext( "initial_break_processing: called for %s/%u\n",
267 file_id_string_tos(&id), (int)file_id);
268 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
269 exclusive_oplocks_open, level_II_oplocks_open );
270 }
271
272 /*
273 * We need to search the file open table for the
274 * entry containing this dev and inode, and ensure
275 * we have an oplock on it.
276 */
277
278 fsp = file_find_dif(sconn, id, file_id);
279
280 if(fsp == NULL) {
281 /* The file could have been closed in the meantime - return success. */
282 if( DEBUGLVL( 3 ) ) {
283 dbgtext( "initial_break_processing: cannot find open file with " );
284 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
285 dbgtext( "allowing break to succeed.\n" );
286 }
287 return NULL;
288 }
289
290 /* Ensure we have an oplock on the file */
291
292 /*
293 * There is a potential race condition in that an oplock could
294 * have been broken due to another udp request, and yet there are
295 * still oplock break messages being sent in the udp message
296 * queue for this file. So return true if we don't have an oplock,
297 * as we may have just freed it.
298 */
299
300 if(fsp->oplock_type == NO_OPLOCK) {
301 if( DEBUGLVL( 3 ) ) {
302 dbgtext( "initial_break_processing: file %s ",
303 fsp_str_dbg(fsp));
304 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
305 file_id_string_tos(&id), fsp->fh->gen_id );
306 dbgtext( "Allowing break to succeed regardless.\n" );
307 }
308 return NULL;
309 }
310
311 return fsp;
312 }
313
314 static void oplock_timeout_handler(struct event_context *ctx,
315 struct timed_event *te,
316 struct timeval now,
317 void *private_data)
318 {
319 files_struct *fsp = (files_struct *)private_data;
320
321 /* Remove the timed event handler. */
322 TALLOC_FREE(fsp->oplock_timeout);
323 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
324 fsp_str_dbg(fsp)));
325 remove_oplock(fsp);
326 reply_to_oplock_break_requests(fsp);
327 }
328
329 /*******************************************************************
330 Add a timeout handler waiting for the client reply.
331 *******************************************************************/
332
333 static void add_oplock_timeout_handler(files_struct *fsp)
334 {
335 /*
336 * If kernel oplocks already notifies smbds when an oplock break times
337 * out, just return.
338 */
339 if (koplocks &&
340 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
341 return;
342 }
343
344 if (fsp->oplock_timeout != NULL) {
345 DEBUG(0, ("Logic problem -- have an oplock event hanging "
346 "around\n"));
347 }
348
349 fsp->oplock_timeout =
350 event_add_timed(smbd_event_context(), fsp,
351 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
352 oplock_timeout_handler, fsp);
353
354 if (fsp->oplock_timeout == NULL) {
355 DEBUG(0, ("Could not add oplock timeout handler\n"));
356 }
357 }
358
359 static void send_break_message_smb1(files_struct *fsp, int level)
360 {
361 char *break_msg = new_break_message_smb1(talloc_tos(),
362 fsp,
363 level);
364 if (break_msg == NULL) {
365 exit_server("Could not talloc break_msg\n");
366 }
367
368 show_msg(break_msg);
369 if (!srv_send_smb(fsp->conn->sconn,
370 break_msg, false, 0,
371 IS_CONN_ENCRYPTED(fsp->conn),
372 NULL)) {
373 exit_server_cleanly("send_break_message_smb1: "
374 "srv_send_smb failed.");
375 }
376
377 TALLOC_FREE(break_msg);
378 }
379
380 void break_level2_to_none_async(files_struct *fsp)
381 {
382 struct smbd_server_connection *sconn = fsp->conn->sconn;
383
384 if (fsp->oplock_type == NO_OPLOCK) {
385 /* We already got a "break to none" message and we've handled
386 * it. just ignore. */
387 DEBUG(3, ("process_oplock_async_level2_break_message: already "
388 "broken to none, ignoring.\n"));
389 return;
390 }
391
392 if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
393 /* Don't tell the client, just downgrade. */
394 DEBUG(3, ("process_oplock_async_level2_break_message: "
395 "downgrading fake level 2 oplock.\n"));
396 remove_oplock(fsp);
397 return;
398 }
399
400 /* Ensure we're really at level2 state. */
401 SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
402
403 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
404 "to none message for fid %d, file %s\n", fsp->fnum,
405 fsp_str_dbg(fsp)));
406
407 /* Now send a break to none message to our client. */
408 if (sconn->using_smb2) {
409 send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
410 } else {
411 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
412 }
413
414 /* Async level2 request, don't send a reply, just remove the oplock. */
415 remove_oplock(fsp);
416 }
417
418 /*******************************************************************
419 This handles the case of a write triggering a break to none
420 message on a level2 oplock.
421 When we get this message we may be in any of three states :
422 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
423 the client for LEVEL2.
424 *******************************************************************/
425
426 void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
427 void *private_data,
428 uint32_t msg_type,
429 struct server_id src,
430 DATA_BLOB *data)
431 {
432 struct smbd_server_connection *sconn;
433 struct share_mode_entry msg;
434 files_struct *fsp;
435
436 if (data->data == NULL) {
437 DEBUG(0, ("Got NULL buffer\n"));
438 return;
439 }
440
441 sconn = msg_ctx_to_sconn(msg_ctx);
442 if (sconn == NULL) {
443 DEBUG(1, ("could not find sconn\n"));
444 return;
445 }
446
447 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
448 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
449 return;
450 }
451
452 /* De-linearize incoming message. */
453 message_to_share_mode_entry(&msg, (char *)data->data);
454
455 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
456 "%s/%lu\n", procid_str(talloc_tos(), &src),
457 file_id_string_tos(&msg.id), msg.share_file_id));
458
459 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
460
461 if (fsp == NULL) {
462 /* We hit a race here. Break messages are sent, and before we
463 * get to process this message, we have closed the file.
464 * No need to reply as this is an async message. */
465 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
466 return;
467 }
468
469 break_level2_to_none_async(fsp);
470 }
471
472 /*******************************************************************
473 This handles the generic oplock break message from another smbd.
474 *******************************************************************/
475
476 static void process_oplock_break_message(struct messaging_context *msg_ctx,
477 void *private_data,
478 uint32_t msg_type,
479 struct server_id src,
480 DATA_BLOB *data)
481 {
482 struct smbd_server_connection *sconn;
483 struct share_mode_entry msg;
484 files_struct *fsp;
485 bool break_to_level2 = False;
486
487 if (data->data == NULL) {
488 DEBUG(0, ("Got NULL buffer\n"));
489 return;
490 }
491
492 sconn = msg_ctx_to_sconn(msg_ctx);
493 if (sconn == NULL) {
494 DEBUG(1, ("could not find sconn\n"));
495 return;
496 }
497
498 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
499 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
500 return;
501 }
502
503 /* De-linearize incoming message. */
504 message_to_share_mode_entry(&msg, (char *)data->data);
505
506 DEBUG(10, ("Got oplock break message from pid %s: %s/%lu\n",
507 procid_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
508 msg.share_file_id));
509
510 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
511
512 if (fsp == NULL) {
513 /* We hit a race here. Break messages are sent, and before we
514 * get to process this message, we have closed the file. Reply
515 * with 'ok, oplock broken' */
516 DEBUG(3, ("Did not find fsp\n"));
517
518 /* We just send the same message back. */
519 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
520 (uint8 *)data->data,
521 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
522 return;
523 }
524
525 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
526 /* Remember we have to inform the requesting PID when the
527 * client replies */
528 msg.pid = src;
529 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
530 &fsp->pending_break_messages,
531 &fsp->num_pending_break_messages);
532 return;
533 }
534
535 if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
536 !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
537 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
538 file_id_string_tos(&fsp->file_id),
539 fsp_str_dbg(fsp)));
540 /* We just send the same message back. */
541 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
542 (uint8 *)data->data,
543 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
544 return;
545 }
546
547 if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
548 !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
549 !(koplocks && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) &&
550 lp_level2_oplocks(SNUM(fsp->conn))) {
551 break_to_level2 = True;
552 }
553
554 /* Need to wait before sending a break
555 message if we sent ourselves this message. */
556 if (procid_is_me(&src)) {
557 wait_before_sending_break();
558 }
559
560 if (sconn->using_smb2) {
561 send_break_message_smb2(fsp, break_to_level2 ?
562 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
563 } else {
564 send_break_message_smb1(fsp, break_to_level2 ?
565 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
566 }
567
568 fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
569
570 msg.pid = src;
571 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
572 &fsp->pending_break_messages,
573 &fsp->num_pending_break_messages);
574
575 add_oplock_timeout_handler(fsp);
576 }
577
578 /*******************************************************************
579 This handles the kernel oplock break message.
580 *******************************************************************/
581
582 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
583 void *private_data,
584 uint32_t msg_type,
585 struct server_id src,
586 DATA_BLOB *data)
587 {
588 struct smbd_server_connection *sconn;
589 struct file_id id;
590 unsigned long file_id;
591 files_struct *fsp;
592
593 if (data->data == NULL) {
594 DEBUG(0, ("Got NULL buffer\n"));
595 return;
596 }
597
598 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
599 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
600 return;
601 }
602
603 sconn = msg_ctx_to_sconn(msg_ctx);
604 if (sconn == NULL) {
605 DEBUG(1, ("could not find sconn\n"));
606 return;
607 }
608
609 /* Pull the data from the message. */
610 pull_file_id_24((char *)data->data, &id);
611 file_id = (unsigned long)IVAL(data->data, 24);
612
613 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
614 procid_str(talloc_tos(), &src), file_id_string_tos(&id),
615 (unsigned int)file_id));
616
617 fsp = initial_break_processing(sconn, id, file_id);
618
619 if (fsp == NULL) {
620 DEBUG(3, ("Got a kernel oplock break message for a file "
621 "I don't know about\n"));
622 return;
623 }
624
625 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
626 /* This is ok, kernel oplocks come in completely async */
627 DEBUG(3, ("Got a kernel oplock request while waiting for a "
628 "break reply\n"));
629 return;
630 }
631
632 if (sconn->using_smb2) {
633 send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
634 } else {
635 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
636 }
637
638 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
639
640 add_oplock_timeout_handler(fsp);
641 }
642
643 void reply_to_oplock_break_requests(files_struct *fsp)
644 {
645 int i;
646
647 /*
648 * If kernel oplocks already notifies smbds when oplocks are
649 * broken/removed, just return.
650 */
651 if (koplocks &&
652 (koplocks->flags & KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION)) {
653 return;
654 }
655
656 for (i=0; i<fsp->num_pending_break_messages; i++) {
657 struct share_mode_entry *e = &fsp->pending_break_messages[i];
658 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
659
660 share_mode_entry_to_message(msg, e);
661
662 messaging_send_buf(fsp->conn->sconn->msg_ctx, e->pid,
663 MSG_SMB_BREAK_RESPONSE,
664 (uint8 *)msg,
665 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
666 }
667
668 SAFE_FREE(fsp->pending_break_messages);
669 fsp->num_pending_break_messages = 0;
670 if (fsp->oplock_timeout != NULL) {
671 /* Remove the timed event handler. */
672 TALLOC_FREE(fsp->oplock_timeout);
673 fsp->oplock_timeout = NULL;
674 }
675 return;
676 }
677
678 static void process_oplock_break_response(struct messaging_context *msg_ctx,
679 void *private_data,
680 uint32_t msg_type,
681 struct server_id src,
682 DATA_BLOB *data)
683 {
684 struct share_mode_entry msg;
685
686 if (data->data == NULL) {
687 DEBUG(0, ("Got NULL buffer\n"));
688 return;
689 }
690
691 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
692 DEBUG(0, ("Got invalid msg len %u\n",
693 (unsigned int)data->length));
694 return;
695 }
696
697 /* De-linearize incoming message. */
698 message_to_share_mode_entry(&msg, (char *)data->data);
699
700 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %llu\n",
701 procid_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
702 msg.share_file_id, (unsigned long long)msg.op_mid));
703
704 schedule_deferred_open_message_smb(msg.op_mid);
705 }
706
707 static void process_open_retry_message(struct messaging_context *msg_ctx,
708 void *private_data,
709 uint32_t msg_type,
710 struct server_id src,
711 DATA_BLOB *data)
712 {
713 struct share_mode_entry msg;
714
715 if (data->data == NULL) {
716 DEBUG(0, ("Got NULL buffer\n"));
717 return;
718 }
719
720 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
721 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
722 return;
723 }
724
725 /* De-linearize incoming message. */
726 message_to_share_mode_entry(&msg, (char *)data->data);
727
728 DEBUG(10, ("Got open retry msg from pid %s: %s mid %llu\n",
729 procid_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
730 (unsigned long long)msg.op_mid));
731
732 schedule_deferred_open_message_smb(msg.op_mid);
733 }
734
735 /****************************************************************************
736 This function is called on any file modification or lock request. If a file
737 is level 2 oplocked then it must tell all other level 2 holders to break to
738 none.
739 ****************************************************************************/
740
741 static void contend_level2_oplocks_begin_default(files_struct *fsp,
742 enum level2_contention_type type)
743 {
744 int i;
745 struct share_mode_lock *lck;
746
747 /*
748 * If this file is level II oplocked then we need
749 * to grab the shared memory lock and inform all
750 * other files with a level II lock that they need
751 * to flush their read caches. We keep the lock over
752 * the shared memory area whilst doing this.
753 */
754
755 if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
756 return;
757
758 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
759 NULL);
760 if (lck == NULL) {
761 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
762 "share mode entry for file %s.\n", fsp_str_dbg(fsp)));
763 return;
764 }
765
766 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
767 lck->num_share_modes ));
768
769 for(i = 0; i < lck->num_share_modes; i++) {
770 struct share_mode_entry *share_entry = &lck->share_modes[i];
771 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
772
773 if (!is_valid_share_mode_entry(share_entry)) {
774 continue;
775 }
776
777 /*
778 * As there could have been multiple writes waiting at the
779 * lock_share_entry gate we may not be the first to
780 * enter. Hence the state of the op_types in the share mode
781 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
782 * oplock. It will do no harm to re-send break messages to
783 * those smbd's that are still waiting their turn to remove
784 * their LEVEL_II state, and also no harm to ignore existing
785 * NO_OPLOCK states. JRA.
786 */
787
788 DEBUG(10,("release_level_2_oplocks_on_change: "
789 "share_entry[%i]->op_type == %d\n",
790 i, share_entry->op_type ));
791
792 if (share_entry->op_type == NO_OPLOCK) {
793 continue;
794 }
795
796 /* Paranoia .... */
797 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
798 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
799 "share mode entry %d is an exlusive "
800 "oplock !\n", i ));
801 TALLOC_FREE(lck);
802 abort();
803 }
804
805 share_mode_entry_to_message(msg, share_entry);
806
807 /*
808 * Deal with a race condition when breaking level2
809 * oplocks. Don't send all the messages and release
810 * the lock, this allows someone else to come in and
811 * get a level2 lock before any of the messages are
812 * processed, and thus miss getting a break message.
813 * Ensure at least one entry (the one we're breaking)
814 * is processed immediately under the lock and becomes
815 * set as NO_OPLOCK to stop any waiter getting a level2.
816 * Bugid #5980.
817 */
818
819 if (procid_is_me(&share_entry->pid)) {
820 wait_before_sending_break();
821 break_level2_to_none_async(fsp);
822 } else {
823 messaging_send_buf(fsp->conn->sconn->msg_ctx,
824 share_entry->pid,
825 MSG_SMB_ASYNC_LEVEL2_BREAK,
826 (uint8 *)msg,
827 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
828 }
829 }
830
831 /* We let the message receivers handle removing the oplock state
832 in the share mode lock db. */
833
834 TALLOC_FREE(lck);
835 }
836
837 void contend_level2_oplocks_begin(files_struct *fsp,
838 enum level2_contention_type type)
839 {
840 if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
841 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
842 return;
843 }
844
845 contend_level2_oplocks_begin_default(fsp, type);
846 }
847
848 void contend_level2_oplocks_end(files_struct *fsp,
849 enum level2_contention_type type)
850 {
851 /* Only kernel oplocks implement this so far */
852 if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
853 koplocks->ops->contend_level2_oplocks_end(fsp, type);
854 }
855 }
856
857 /****************************************************************************
858 Linearize a share mode entry struct to an internal oplock break message.
859 ****************************************************************************/
860
861 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
862 {
863 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32)e->pid.pid);
864 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
865 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
866 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
867 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
868 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
869 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
870 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
871 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
872 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
873 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
874 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
875 #ifdef CLUSTER_SUPPORT
876 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
877 #endif
878 }
879
880 /****************************************************************************
881 De-linearize an internal oplock break message to a share mode entry struct.
882 ****************************************************************************/
883
884 void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
885 {
886 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
887 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
888 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
889 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
890 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
891 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
892 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
893 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
894 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
895 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
896 e->uid = (uint32)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
897 e->flags = (uint16)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
898 #ifdef CLUSTER_SUPPORT
899 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
900 #endif
901 }
902
903 /****************************************************************************
904 Setup oplocks for this process.
905 ****************************************************************************/
906
907 bool init_oplocks(struct messaging_context *msg_ctx)
908 {
909 DEBUG(3,("init_oplocks: initializing messages.\n"));
910
911 messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_REQUEST,
912 process_oplock_break_message);
913 messaging_register(msg_ctx, NULL, MSG_SMB_ASYNC_LEVEL2_BREAK,
914 process_oplock_async_level2_break_message);
915 messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_RESPONSE,
916 process_oplock_break_response);
917 messaging_register(msg_ctx, NULL, MSG_SMB_KERNEL_BREAK,
918 process_kernel_oplock_break);
919 messaging_register(msg_ctx, NULL, MSG_SMB_OPEN_RETRY,
920 process_open_retry_message);
921
922 if (lp_kernel_oplocks()) {
923 #if HAVE_KERNEL_OPLOCKS_IRIX
924 koplocks = irix_init_kernel_oplocks(talloc_autofree_context());
925 #elif HAVE_KERNEL_OPLOCKS_LINUX
926 koplocks = linux_init_kernel_oplocks(talloc_autofree_context());
927 #elif HAVE_ONEFS
928 koplocks = onefs_init_kernel_oplocks(talloc_autofree_context());
929 #endif
930 }
931
932 return True;
933 }
reg import