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s3: fix comment header description for smbd_shim
[Samba/gebeck_regimport.git] / source3 / smbd / oplock.c
blob406ffd1e3d4666140cd47476978aa901835d55f2
1 /*
2 Unix SMB/CIFS implementation.
3 oplock processing
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998 - 2001
6 Copyright (C) Volker Lendecke 2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #define DBGC_CLASS DBGC_LOCKING
23 #include "includes.h"
24 #include "smbd/smbd.h"
25 #include "smbd/globals.h"
26 #include "messages.h"
27 #include "../librpc/gen_ndr/open_files.h"
28
29 /*
30 * helper function used by the kernel oplock backends to post the break message
31 */
32 void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
33 {
34 uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
35
36 /* Put the kernel break info into the message. */
37 push_file_id_24((char *)msg, &fsp->file_id);
38 SIVAL(msg,24,fsp->fh->gen_id);
39
40 /* Don't need to be root here as we're only ever
41 sending to ourselves. */
42
43 messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
44 MSG_SMB_KERNEL_BREAK,
45 msg, MSG_SMB_KERNEL_BREAK_SIZE);
46 }
47
48 /****************************************************************************
49 Attempt to set an oplock on a file. Succeeds if kernel oplocks are
50 disabled (just sets flags) and no byte-range locks in the file. Returns True
51 if oplock set.
52 ****************************************************************************/
53
54 NTSTATUS set_file_oplock(files_struct *fsp, int oplock_type)
55 {
56 struct smbd_server_connection *sconn = fsp->conn->sconn;
57 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
58 bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
59
60 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
61 if (use_kernel &&
62 !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
63 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
64 "don't support them\n"));
65 return NT_STATUS_NOT_SUPPORTED;
66 }
67 }
68
69 if ((fsp->oplock_type != NO_OPLOCK) &&
70 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
71 use_kernel &&
72 !koplocks->ops->set_oplock(koplocks, fsp, oplock_type))
73 {
74 return map_nt_error_from_unix(errno);
75 }
76
77 fsp->oplock_type = oplock_type;
78 fsp->sent_oplock_break = NO_BREAK_SENT;
79 if (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 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
103 if ((fsp->oplock_type != NO_OPLOCK) &&
104 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
105 koplocks) {
106 koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
107 }
108
109 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
110 sconn->oplocks.level_II_open--;
111 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
112 sconn->oplocks.exclusive_open--;
113 }
114
115 SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
116 SMB_ASSERT(sconn->oplocks.level_II_open>=0);
117
118 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
119 /* This doesn't matter for close. */
120 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
121 } else {
122 fsp->oplock_type = NO_OPLOCK;
123 }
124 fsp->sent_oplock_break = NO_BREAK_SENT;
125
126 flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
127 delete_write_cache(fsp);
128
129 TALLOC_FREE(fsp->oplock_timeout);
130 }
131
132 /****************************************************************************
133 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
134 ****************************************************************************/
135
136 static void downgrade_file_oplock(files_struct *fsp)
137 {
138 struct smbd_server_connection *sconn = fsp->conn->sconn;
139 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
140
141 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
142 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
143 return;
144 }
145
146 if (koplocks) {
147 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
148 }
149 fsp->oplock_type = LEVEL_II_OPLOCK;
150 sconn->oplocks.exclusive_open--;
151 sconn->oplocks.level_II_open++;
152 fsp->sent_oplock_break = NO_BREAK_SENT;
153 }
154
155 /****************************************************************************
156 Remove a file oplock. Copes with level II and exclusive.
157 Locks then unlocks the share mode lock. Client can decide to go directly
158 to none even if a "break-to-level II" was sent.
159 ****************************************************************************/
160
161 bool remove_oplock(files_struct *fsp)
162 {
163 bool ret;
164 struct share_mode_lock *lck;
165
166 /* Remove the oplock flag from the sharemode. */
167 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
168 if (lck == NULL) {
169 DEBUG(0,("remove_oplock: failed to lock share entry for "
170 "file %s\n", fsp_str_dbg(fsp)));
171 return False;
172 }
173 ret = remove_share_oplock(lck, fsp);
174 if (!ret) {
175 DEBUG(0,("remove_oplock: failed to remove share oplock for "
176 "file %s, %s, %s\n",
177 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
178 file_id_string_tos(&fsp->file_id)));
179 }
180 release_file_oplock(fsp);
181 TALLOC_FREE(lck);
182 return ret;
183 }
184
185 /*
186 * Deal with a reply when a break-to-level II was sent.
187 */
188 bool downgrade_oplock(files_struct *fsp)
189 {
190 bool ret;
191 struct share_mode_lock *lck;
192
193 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
194 if (lck == NULL) {
195 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
196 "file %s\n", fsp_str_dbg(fsp)));
197 return False;
198 }
199 ret = downgrade_share_oplock(lck, fsp);
200 if (!ret) {
201 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
202 "for file %s, %s, file_id %s\n",
203 fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
204 file_id_string_tos(&fsp->file_id)));
205 }
206
207 downgrade_file_oplock(fsp);
208 TALLOC_FREE(lck);
209 return ret;
210 }
211
212 /*
213 * Some kernel oplock implementations handle the notification themselves.
214 */
215 bool should_notify_deferred_opens(struct smbd_server_connection *sconn)
216 {
217 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
218 return !(koplocks &&
219 (koplocks->flags & KOPLOCKS_DEFERRED_OPEN_NOTIFICATION));
220 }
221
222 /****************************************************************************
223 Set up an oplock break message.
224 ****************************************************************************/
225
226 static char *new_break_message_smb1(TALLOC_CTX *mem_ctx,
227 files_struct *fsp, int cmd)
228 {
229 char *result = talloc_array(mem_ctx, char, smb_size + 8*2 + 0);
230
231 if (result == NULL) {
232 DEBUG(0, ("talloc failed\n"));
233 return NULL;
234 }
235
236 memset(result,'\0',smb_size);
237 srv_set_message(result,8,0,true);
238 SCVAL(result,smb_com,SMBlockingX);
239 SSVAL(result,smb_tid,fsp->conn->cnum);
240 SSVAL(result,smb_pid,0xFFFF);
241 SSVAL(result,smb_uid,0);
242 SSVAL(result,smb_mid,0xFFFF);
243 SCVAL(result,smb_vwv0,0xFF);
244 SSVAL(result,smb_vwv2,fsp->fnum);
245 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
246 SCVAL(result,smb_vwv3+1,cmd);
247 return result;
248 }
249
250 /****************************************************************************
251 Function to do the waiting before sending a local break.
252 ****************************************************************************/
253
254 static void wait_before_sending_break(void)
255 {
256 long wait_time = (long)lp_oplock_break_wait_time();
257
258 if (wait_time) {
259 smb_msleep(wait_time);
260 }
261 }
262
263 /****************************************************************************
264 Ensure that we have a valid oplock.
265 ****************************************************************************/
266
267 static files_struct *initial_break_processing(
268 struct smbd_server_connection *sconn, struct file_id id,
269 unsigned long file_id)
270 {
271 files_struct *fsp = NULL;
272
273 if( DEBUGLVL( 3 ) ) {
274 dbgtext( "initial_break_processing: called for %s/%u\n",
275 file_id_string_tos(&id), (int)file_id);
276 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
277 sconn->oplocks.exclusive_open,
278 sconn->oplocks.level_II_open);
279 }
280
281 /*
282 * We need to search the file open table for the
283 * entry containing this dev and inode, and ensure
284 * we have an oplock on it.
285 */
286
287 fsp = file_find_dif(sconn, id, file_id);
288
289 if(fsp == NULL) {
290 /* The file could have been closed in the meantime - return success. */
291 if( DEBUGLVL( 3 ) ) {
292 dbgtext( "initial_break_processing: cannot find open file with " );
293 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
294 dbgtext( "allowing break to succeed.\n" );
295 }
296 return NULL;
297 }
298
299 /* Ensure we have an oplock on the file */
300
301 /*
302 * There is a potential race condition in that an oplock could
303 * have been broken due to another udp request, and yet there are
304 * still oplock break messages being sent in the udp message
305 * queue for this file. So return true if we don't have an oplock,
306 * as we may have just freed it.
307 */
308
309 if(fsp->oplock_type == NO_OPLOCK) {
310 if( DEBUGLVL( 3 ) ) {
311 dbgtext( "initial_break_processing: file %s ",
312 fsp_str_dbg(fsp));
313 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
314 file_id_string_tos(&id), fsp->fh->gen_id );
315 dbgtext( "Allowing break to succeed regardless.\n" );
316 }
317 return NULL;
318 }
319
320 return fsp;
321 }
322
323 static void oplock_timeout_handler(struct event_context *ctx,
324 struct timed_event *te,
325 struct timeval now,
326 void *private_data)
327 {
328 files_struct *fsp = (files_struct *)private_data;
329
330 /* Remove the timed event handler. */
331 TALLOC_FREE(fsp->oplock_timeout);
332 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
333 fsp_str_dbg(fsp)));
334 remove_oplock(fsp);
335 reply_to_oplock_break_requests(fsp);
336 }
337
338 /*******************************************************************
339 Add a timeout handler waiting for the client reply.
340 *******************************************************************/
341
342 static void add_oplock_timeout_handler(files_struct *fsp)
343 {
344 struct smbd_server_connection *sconn = fsp->conn->sconn;
345 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
346
347 /*
348 * If kernel oplocks already notifies smbds when an oplock break times
349 * out, just return.
350 */
351 if (koplocks &&
352 (koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
353 return;
354 }
355
356 if (fsp->oplock_timeout != NULL) {
357 DEBUG(0, ("Logic problem -- have an oplock event hanging "
358 "around\n"));
359 }
360
361 fsp->oplock_timeout =
362 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
363 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
364 oplock_timeout_handler, fsp);
365
366 if (fsp->oplock_timeout == NULL) {
367 DEBUG(0, ("Could not add oplock timeout handler\n"));
368 }
369 }
370
371 static void send_break_message_smb1(files_struct *fsp, int level)
372 {
373 char *break_msg = new_break_message_smb1(talloc_tos(),
374 fsp,
375 level);
376 if (break_msg == NULL) {
377 exit_server("Could not talloc break_msg\n");
378 }
379
380 show_msg(break_msg);
381 if (!srv_send_smb(fsp->conn->sconn,
382 break_msg, false, 0,
383 IS_CONN_ENCRYPTED(fsp->conn),
384 NULL)) {
385 exit_server_cleanly("send_break_message_smb1: "
386 "srv_send_smb failed.");
387 }
388
389 TALLOC_FREE(break_msg);
390 }
391
392 void break_level2_to_none_async(files_struct *fsp)
393 {
394 struct smbd_server_connection *sconn = fsp->conn->sconn;
395
396 if (fsp->oplock_type == NO_OPLOCK) {
397 /* We already got a "break to none" message and we've handled
398 * it. just ignore. */
399 DEBUG(3, ("process_oplock_async_level2_break_message: already "
400 "broken to none, ignoring.\n"));
401 return;
402 }
403
404 if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
405 /* Don't tell the client, just downgrade. */
406 DEBUG(3, ("process_oplock_async_level2_break_message: "
407 "downgrading fake level 2 oplock.\n"));
408 remove_oplock(fsp);
409 return;
410 }
411
412 /* Ensure we're really at level2 state. */
413 SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
414
415 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
416 "to none message for %s, file %s\n", fsp_fnum_dbg(fsp),
417 fsp_str_dbg(fsp)));
418
419 /* Now send a break to none message to our client. */
420 if (sconn->using_smb2) {
421 send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
422 } else {
423 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
424 }
425
426 /* Async level2 request, don't send a reply, just remove the oplock. */
427 remove_oplock(fsp);
428 }
429
430 /*******************************************************************
431 This handles the case of a write triggering a break to none
432 message on a level2 oplock.
433 When we get this message we may be in any of three states :
434 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
435 the client for LEVEL2.
436 *******************************************************************/
437
438 static void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
439 void *private_data,
440 uint32_t msg_type,
441 struct server_id src,
442 DATA_BLOB *data)
443 {
444 struct share_mode_entry msg;
445 files_struct *fsp;
446 struct smbd_server_connection *sconn =
447 talloc_get_type_abort(private_data,
448 struct smbd_server_connection);
449
450 if (data->data == NULL) {
451 DEBUG(0, ("Got NULL buffer\n"));
452 return;
453 }
454
455 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
456 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
457 return;
458 }
459
460 /* De-linearize incoming message. */
461 message_to_share_mode_entry(&msg, (char *)data->data);
462
463 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
464 "%s/%llu\n", server_id_str(talloc_tos(), &src),
465 file_id_string_tos(&msg.id),
466 (unsigned long long)msg.share_file_id));
467
468 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
469
470 if (fsp == NULL) {
471 /* We hit a race here. Break messages are sent, and before we
472 * get to process this message, we have closed the file.
473 * No need to reply as this is an async message. */
474 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
475 return;
476 }
477
478 break_level2_to_none_async(fsp);
479 }
480
481 /*******************************************************************
482 This handles the generic oplock break message from another smbd.
483 *******************************************************************/
484
485 static void process_oplock_break_message(struct messaging_context *msg_ctx,
486 void *private_data,
487 uint32_t msg_type,
488 struct server_id src,
489 DATA_BLOB *data)
490 {
491 struct share_mode_entry msg;
492 files_struct *fsp;
493 bool break_to_level2 = False;
494 bool use_kernel;
495 struct smbd_server_connection *sconn =
496 talloc_get_type_abort(private_data,
497 struct smbd_server_connection);
498 struct server_id self = messaging_server_id(sconn->msg_ctx);
499 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
500
501 if (data->data == NULL) {
502 DEBUG(0, ("Got NULL buffer\n"));
503 return;
504 }
505
506 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
507 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
508 return;
509 }
510
511 /* De-linearize incoming message. */
512 message_to_share_mode_entry(&msg, (char *)data->data);
513
514 DEBUG(10, ("Got oplock break message from pid %s: %s/%llu\n",
515 server_id_str(talloc_tos(), &src),
516 file_id_string_tos(&msg.id),
517 (unsigned long long)msg.share_file_id));
518
519 fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
520
521 if (fsp == NULL) {
522 /* We hit a race here. Break messages are sent, and before we
523 * get to process this message, we have closed the file. Reply
524 * with 'ok, oplock broken' */
525 DEBUG(3, ("Did not find fsp\n"));
526
527 /* We just send the same message back. */
528 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
529 (uint8 *)data->data,
530 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
531 return;
532 }
533
534 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
535 /* Remember we have to inform the requesting PID when the
536 * client replies */
537 msg.pid = src;
538 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
539 &fsp->pending_break_messages,
540 &fsp->num_pending_break_messages);
541 return;
542 }
543
544 if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
545 !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
546 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
547 file_id_string_tos(&fsp->file_id),
548 fsp_str_dbg(fsp)));
549 /* We just send the same message back. */
550 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
551 (uint8 *)data->data,
552 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
553 return;
554 }
555
556 use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
557
558 if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
559 !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
560 !(use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) &&
561 lp_level2_oplocks(SNUM(fsp->conn))) {
562 break_to_level2 = True;
563 }
564
565 /* Need to wait before sending a break
566 message if we sent ourselves this message. */
567 if (serverid_equal(&self, &src)) {
568 wait_before_sending_break();
569 }
570
571 if (sconn->using_smb2) {
572 send_break_message_smb2(fsp, break_to_level2 ?
573 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
574 } else {
575 send_break_message_smb1(fsp, break_to_level2 ?
576 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
577 }
578
579 fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
580
581 msg.pid = src;
582 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
583 &fsp->pending_break_messages,
584 &fsp->num_pending_break_messages);
585
586 add_oplock_timeout_handler(fsp);
587 }
588
589 /*******************************************************************
590 This handles the kernel oplock break message.
591 *******************************************************************/
592
593 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
594 void *private_data,
595 uint32_t msg_type,
596 struct server_id src,
597 DATA_BLOB *data)
598 {
599 struct file_id id;
600 unsigned long file_id;
601 files_struct *fsp;
602 struct smbd_server_connection *sconn =
603 talloc_get_type_abort(private_data,
604 struct smbd_server_connection);
605
606 if (data->data == NULL) {
607 DEBUG(0, ("Got NULL buffer\n"));
608 return;
609 }
610
611 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
612 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
613 return;
614 }
615
616 /* Pull the data from the message. */
617 pull_file_id_24((char *)data->data, &id);
618 file_id = (unsigned long)IVAL(data->data, 24);
619
620 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
621 server_id_str(talloc_tos(), &src), file_id_string_tos(&id),
622 (unsigned int)file_id));
623
624 fsp = initial_break_processing(sconn, id, file_id);
625
626 if (fsp == NULL) {
627 DEBUG(3, ("Got a kernel oplock break message for a file "
628 "I don't know about\n"));
629 return;
630 }
631
632 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
633 /* This is ok, kernel oplocks come in completely async */
634 DEBUG(3, ("Got a kernel oplock request while waiting for a "
635 "break reply\n"));
636 return;
637 }
638
639 if (sconn->using_smb2) {
640 send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
641 } else {
642 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
643 }
644
645 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
646
647 add_oplock_timeout_handler(fsp);
648 }
649
650 void reply_to_oplock_break_requests(files_struct *fsp)
651 {
652 struct smbd_server_connection *sconn = fsp->conn->sconn;
653 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
654 int i;
655
656 /*
657 * If kernel oplocks already notifies smbds when oplocks are
658 * broken/removed, just return.
659 */
660 if (koplocks &&
661 (koplocks->flags & KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION)) {
662 return;
663 }
664
665 for (i=0; i<fsp->num_pending_break_messages; i++) {
666 struct share_mode_entry *e = &fsp->pending_break_messages[i];
667 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
668
669 share_mode_entry_to_message(msg, e);
670
671 messaging_send_buf(fsp->conn->sconn->msg_ctx, e->pid,
672 MSG_SMB_BREAK_RESPONSE,
673 (uint8 *)msg,
674 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
675 }
676
677 SAFE_FREE(fsp->pending_break_messages);
678 fsp->num_pending_break_messages = 0;
679 TALLOC_FREE(fsp->oplock_timeout);
680 return;
681 }
682
683 static void process_oplock_break_response(struct messaging_context *msg_ctx,
684 void *private_data,
685 uint32_t msg_type,
686 struct server_id src,
687 DATA_BLOB *data)
688 {
689 struct share_mode_entry msg;
690 struct smbd_server_connection *sconn =
691 talloc_get_type_abort(private_data,
692 struct smbd_server_connection);
693
694 if (data->data == NULL) {
695 DEBUG(0, ("Got NULL buffer\n"));
696 return;
697 }
698
699 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
700 DEBUG(0, ("Got invalid msg len %u\n",
701 (unsigned int)data->length));
702 return;
703 }
704
705 /* De-linearize incoming message. */
706 message_to_share_mode_entry(&msg, (char *)data->data);
707
708 DEBUG(10, ("Got oplock break response from pid %s: %s/%llu mid %llu\n",
709 server_id_str(talloc_tos(), &src),
710 file_id_string_tos(&msg.id),
711 (unsigned long long)msg.share_file_id,
712 (unsigned long long)msg.op_mid));
713
714 schedule_deferred_open_message_smb(sconn, msg.op_mid);
715 }
716
717 static void process_open_retry_message(struct messaging_context *msg_ctx,
718 void *private_data,
719 uint32_t msg_type,
720 struct server_id src,
721 DATA_BLOB *data)
722 {
723 struct share_mode_entry msg;
724 struct smbd_server_connection *sconn =
725 talloc_get_type_abort(private_data,
726 struct smbd_server_connection);
727
728 if (data->data == NULL) {
729 DEBUG(0, ("Got NULL buffer\n"));
730 return;
731 }
732
733 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
734 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
735 return;
736 }
737
738 /* De-linearize incoming message. */
739 message_to_share_mode_entry(&msg, (char *)data->data);
740
741 DEBUG(10, ("Got open retry msg from pid %s: %s mid %llu\n",
742 server_id_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
743 (unsigned long long)msg.op_mid));
744
745 schedule_deferred_open_message_smb(sconn, msg.op_mid);
746 }
747
748 struct break_to_none_state {
749 struct smbd_server_connection *sconn;
750 struct file_id id;
751 };
752 static void do_break_to_none(struct tevent_req *req);
753
754 /****************************************************************************
755 This function is called on any file modification or lock request. If a file
756 is level 2 oplocked then it must tell all other level 2 holders to break to
757 none.
758 ****************************************************************************/
759
760 static void contend_level2_oplocks_begin_default(files_struct *fsp,
761 enum level2_contention_type type)
762 {
763 struct smbd_server_connection *sconn = fsp->conn->sconn;
764 struct tevent_req *req;
765 struct break_to_none_state *state;
766
767 /*
768 * If this file is level II oplocked then we need
769 * to grab the shared memory lock and inform all
770 * other files with a level II lock that they need
771 * to flush their read caches. We keep the lock over
772 * the shared memory area whilst doing this.
773 */
774
775 if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
776 return;
777
778 /*
779 * When we get here we might have a brlock entry locked. Also
780 * locking the share mode entry would violate the locking
781 * order. Breaking level2 oplocks to none is asynchronous
782 * anyway, so we postpone this into an immediate timed event.
783 */
784
785 state = talloc(sconn, struct break_to_none_state);
786 if (state == NULL) {
787 DEBUG(1, ("talloc failed\n"));
788 return;
789 }
790 state->sconn = sconn;
791 state->id = fsp->file_id;
792
793 req = tevent_wakeup_send(state, sconn->ev_ctx, timeval_set(0, 0));
794 if (req == NULL) {
795 DEBUG(1, ("tevent_wakeup_send failed\n"));
796 TALLOC_FREE(state);
797 return;
798 }
799 tevent_req_set_callback(req, do_break_to_none, state);
800 return;
801 }
802
803 static void do_break_to_none(struct tevent_req *req)
804 {
805 struct break_to_none_state *state = tevent_req_callback_data(
806 req, struct break_to_none_state);
807 struct server_id self = messaging_server_id(state->sconn->msg_ctx);
808 bool ret;
809 int i;
810 struct share_mode_lock *lck;
811
812 ret = tevent_wakeup_recv(req);
813 TALLOC_FREE(req);
814 if (!ret) {
815 DEBUG(1, ("tevent_wakeup_recv failed\n"));
816 goto done;
817 }
818 lck = get_existing_share_mode_lock(talloc_tos(), state->id);
819 if (lck == NULL) {
820 DEBUG(1, ("release_level_2_oplocks_on_change: failed to lock "
821 "share mode entry for file %s.\n",
822 file_id_string_tos(&state->id)));
823 goto done;
824 }
825
826 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
827 lck->data->num_share_modes ));
828
829 for(i = 0; i < lck->data->num_share_modes; i++) {
830 struct share_mode_entry *share_entry = &lck->data->share_modes[i];
831 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
832
833 if (!is_valid_share_mode_entry(share_entry)) {
834 continue;
835 }
836
837 /*
838 * As there could have been multiple writes waiting at the
839 * lock_share_entry gate we may not be the first to
840 * enter. Hence the state of the op_types in the share mode
841 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
842 * oplock. It will do no harm to re-send break messages to
843 * those smbd's that are still waiting their turn to remove
844 * their LEVEL_II state, and also no harm to ignore existing
845 * NO_OPLOCK states. JRA.
846 */
847
848 DEBUG(10,("release_level_2_oplocks_on_change: "
849 "share_entry[%i]->op_type == %d\n",
850 i, share_entry->op_type ));
851
852 if (share_entry->op_type == NO_OPLOCK) {
853 continue;
854 }
855
856 /* Paranoia .... */
857 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
858 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
859 "share mode entry %d is an exlusive "
860 "oplock !\n", i ));
861 TALLOC_FREE(lck);
862 abort();
863 }
864
865 share_mode_entry_to_message(msg, share_entry);
866
867 /*
868 * Deal with a race condition when breaking level2
869 * oplocks. Don't send all the messages and release
870 * the lock, this allows someone else to come in and
871 * get a level2 lock before any of the messages are
872 * processed, and thus miss getting a break message.
873 * Ensure at least one entry (the one we're breaking)
874 * is processed immediately under the lock and becomes
875 * set as NO_OPLOCK to stop any waiter getting a level2.
876 * Bugid #5980.
877 */
878
879 if (serverid_equal(&self, &share_entry->pid)) {
880 struct files_struct *cur_fsp =
881 initial_break_processing(state->sconn,
882 share_entry->id,
883 share_entry->share_file_id);
884 wait_before_sending_break();
885 if (cur_fsp != NULL) {
886 break_level2_to_none_async(cur_fsp);
887 } else {
888 DEBUG(3, ("release_level_2_oplocks_on_change: "
889 "Did not find fsp, ignoring\n"));
890 }
891 } else {
892 messaging_send_buf(state->sconn->msg_ctx,
893 share_entry->pid,
894 MSG_SMB_ASYNC_LEVEL2_BREAK,
895 (uint8 *)msg,
896 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
897 }
898 }
899
900 /* We let the message receivers handle removing the oplock state
901 in the share mode lock db. */
902
903 TALLOC_FREE(lck);
904 done:
905 TALLOC_FREE(state);
906 return;
907 }
908
909 void smbd_contend_level2_oplocks_begin(files_struct *fsp,
910 enum level2_contention_type type)
911 {
912 struct smbd_server_connection *sconn = fsp->conn->sconn;
913 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
914
915 if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
916 koplocks->ops->contend_level2_oplocks_begin(fsp, type);
917 return;
918 }
919
920 contend_level2_oplocks_begin_default(fsp, type);
921 }
922
923 void smbd_contend_level2_oplocks_end(files_struct *fsp,
924 enum level2_contention_type type)
925 {
926 struct smbd_server_connection *sconn = fsp->conn->sconn;
927 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
928
929 /* Only kernel oplocks implement this so far */
930 if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
931 koplocks->ops->contend_level2_oplocks_end(fsp, type);
932 }
933 }
934
935 /****************************************************************************
936 Linearize a share mode entry struct to an internal oplock break message.
937 ****************************************************************************/
938
939 void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
940 {
941 SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32)e->pid.pid);
942 SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
943 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
944 SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
945 SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
946 SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
947 SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
948 SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
949 push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
950 SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
951 SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
952 SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
953 SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
954 SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
955 }
956
957 /****************************************************************************
958 De-linearize an internal oplock break message to a share mode entry struct.
959 ****************************************************************************/
960
961 void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
962 {
963 e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
964 e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
965 e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
966 e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
967 e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
968 e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
969 e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
970 e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
971 pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
972 e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
973 e->uid = (uint32)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
974 e->flags = (uint16)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
975 e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
976 e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
977 }
978
979 /****************************************************************************
980 Setup oplocks for this process.
981 ****************************************************************************/
982
983 bool init_oplocks(struct smbd_server_connection *sconn)
984 {
985 DEBUG(3,("init_oplocks: initializing messages.\n"));
986
987 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
988 process_oplock_break_message);
989 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_ASYNC_LEVEL2_BREAK,
990 process_oplock_async_level2_break_message);
991 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_RESPONSE,
992 process_oplock_break_response);
993 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
994 process_kernel_oplock_break);
995 messaging_register(sconn->msg_ctx, sconn, MSG_SMB_OPEN_RETRY,
996 process_open_retry_message);
997
998 return true;
999 }
1000
1001 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1002 {
1003 struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1004
1005 /* only initialize once */
1006 if (koplocks == NULL) {
1007 #if HAVE_KERNEL_OPLOCKS_IRIX
1008 koplocks = irix_init_kernel_oplocks(sconn);
1009 #elif HAVE_KERNEL_OPLOCKS_LINUX
1010 koplocks = linux_init_kernel_oplocks(sconn);
1011 #endif
1012 sconn->oplocks.kernel_ops = koplocks;
1013 }
1014 }
reg import