source: branches/samba-3.3.x/source/smbd/oplock.c

Last change on this file was 578, checked in by Herwig Bauernfeind, 14 years ago

Update Samba 3.3 to 3.3.15 (security update)
File size: 28.2 KB
RevLine 
[224]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
25/* Current number of oplocks we have outstanding. */
26static int32 exclusive_oplocks_open = 0;
27static int32 level_II_oplocks_open = 0;
28bool global_client_failed_oplock_break = False;
29
30extern uint32 global_client_caps;
31
32static struct kernel_oplocks *koplocks;
33
34/****************************************************************************
35 Get the number of current exclusive oplocks.
36****************************************************************************/
37
38int32 get_number_of_exclusive_open_oplocks(void)
39{
40 return exclusive_oplocks_open;
41}
42
43/****************************************************************************
44 Return True if an oplock message is pending.
45****************************************************************************/
46
47bool oplock_message_waiting(fd_set *fds)
48{
49 if (koplocks && koplocks->msg_waiting(fds)) {
50 return True;
51 }
52
53 return False;
54}
55
56/****************************************************************************
57 Find out if there are any kernel oplock messages waiting and process them
58 if so. pfds is the fd_set from the main select loop (which contains any
59 kernel oplock fd if that's what the system uses (IRIX). If may be NULL if
60 we're calling this in a shutting down state.
61****************************************************************************/
62
63void process_kernel_oplocks(struct messaging_context *msg_ctx, fd_set *pfds)
64{
65 /*
66 * We need to check for kernel oplocks before going into the select
67 * here, as the EINTR generated by the linux kernel oplock may have
68 * already been eaten. JRA.
69 */
70
71 if (!koplocks) {
72 return;
73 }
74
75 while (koplocks->msg_waiting(pfds)) {
76 files_struct *fsp;
77 char msg[MSG_SMB_KERNEL_BREAK_SIZE];
78
79 fsp = koplocks->receive_message(pfds);
80
81 if (fsp == NULL) {
82 DEBUG(3, ("Kernel oplock message announced, but none "
83 "received\n"));
84 return;
85 }
86
87 /* Put the kernel break info into the message. */
88 push_file_id_16(msg, &fsp->file_id);
89 SIVAL(msg,16,fsp->fh->gen_id);
90
91 /* Don't need to be root here as we're only ever
92 sending to ourselves. */
93
94 messaging_send_buf(msg_ctx, procid_self(),
95 MSG_SMB_KERNEL_BREAK,
96 (uint8 *)&msg, MSG_SMB_KERNEL_BREAK_SIZE);
97 }
98}
99
100/****************************************************************************
101 Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
102 disabled (just sets flags). Returns True if oplock set.
103****************************************************************************/
104
105bool set_file_oplock(files_struct *fsp, int oplock_type)
106{
107 if ((fsp->oplock_type != NO_OPLOCK) &&
108 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
109 koplocks &&
110 !koplocks->set_oplock(fsp, oplock_type)) {
111 return False;
112 }
113
114 fsp->oplock_type = oplock_type;
115 fsp->sent_oplock_break = NO_BREAK_SENT;
116 if (oplock_type == LEVEL_II_OPLOCK) {
117 level_II_oplocks_open++;
118 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
119 exclusive_oplocks_open++;
120 }
121
122 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
123 "tv_sec = %x, tv_usec = %x\n",
124 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
125 fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
126 (int)fsp->open_time.tv_usec ));
127
128 return True;
129}
130
131/****************************************************************************
132 Attempt to release an oplock on a file. Decrements oplock count.
133****************************************************************************/
134
135void release_file_oplock(files_struct *fsp)
136{
137 if ((fsp->oplock_type != NO_OPLOCK) &&
138 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
139 koplocks) {
140 koplocks->release_oplock(fsp);
141 }
142
143 if (fsp->oplock_type == LEVEL_II_OPLOCK) {
144 level_II_oplocks_open--;
145 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
146 exclusive_oplocks_open--;
147 }
148
149 SMB_ASSERT(exclusive_oplocks_open>=0);
150 SMB_ASSERT(level_II_oplocks_open>=0);
151
152 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
153 /* This doesn't matter for close. */
154 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
155 } else {
156 fsp->oplock_type = NO_OPLOCK;
157 }
158 fsp->sent_oplock_break = NO_BREAK_SENT;
159
160 flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
161
162 TALLOC_FREE(fsp->oplock_timeout);
163}
164
165/****************************************************************************
166 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
167****************************************************************************/
168
169static void downgrade_file_oplock(files_struct *fsp)
170{
171 if (koplocks) {
172 koplocks->release_oplock(fsp);
173 }
174 fsp->oplock_type = LEVEL_II_OPLOCK;
175 exclusive_oplocks_open--;
176 level_II_oplocks_open++;
177 fsp->sent_oplock_break = NO_BREAK_SENT;
178}
179
180/****************************************************************************
181 Remove a file oplock. Copes with level II and exclusive.
182 Locks then unlocks the share mode lock. Client can decide to go directly
183 to none even if a "break-to-level II" was sent.
184****************************************************************************/
185
186bool remove_oplock(files_struct *fsp)
187{
188 bool ret;
189 struct share_mode_lock *lck;
190
191 /* Remove the oplock flag from the sharemode. */
192 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
193 NULL);
194 if (lck == NULL) {
195 DEBUG(0,("remove_oplock: failed to lock share entry for "
196 "file %s\n", fsp->fsp_name ));
197 return False;
198 }
199 ret = remove_share_oplock(lck, fsp);
200 if (!ret) {
201 DEBUG(0,("remove_oplock: failed to remove share oplock for "
202 "file %s fnum %d, %s\n",
203 fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
204 }
205 release_file_oplock(fsp);
206 TALLOC_FREE(lck);
207 return ret;
208}
209
210/*
211 * Deal with a reply when a break-to-level II was sent.
212 */
213bool downgrade_oplock(files_struct *fsp)
214{
215 bool ret;
216 struct share_mode_lock *lck;
217
218 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
219 NULL);
220 if (lck == NULL) {
221 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
222 "file %s\n", fsp->fsp_name ));
223 return False;
224 }
225 ret = downgrade_share_oplock(lck, fsp);
226 if (!ret) {
227 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
228 "for file %s fnum %d, file_id %s\n",
229 fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
230 }
231
232 downgrade_file_oplock(fsp);
233 TALLOC_FREE(lck);
234 return ret;
235}
236
237/****************************************************************************
238 Return the fd (if any) used for receiving oplock notifications.
239****************************************************************************/
240
241int oplock_notify_fd(void)
242{
243 if (koplocks) {
[578]244 int fd = koplocks->notification_fd;
245 if (fd < 0 || fd >= FD_SETSIZE) {
246 return -1;
247 }
[224]248 }
249
250 return -1;
251}
252
253/****************************************************************************
254 Set up an oplock break message.
255****************************************************************************/
256
257static char *new_break_smb_message(TALLOC_CTX *mem_ctx,
258 files_struct *fsp, uint8 cmd)
259{
260 char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
261
262 if (result == NULL) {
263 DEBUG(0, ("talloc failed\n"));
264 return NULL;
265 }
266
267 memset(result,'\0',smb_size);
268 srv_set_message(result,8,0,true);
269 SCVAL(result,smb_com,SMBlockingX);
270 SSVAL(result,smb_tid,fsp->conn->cnum);
271 SSVAL(result,smb_pid,0xFFFF);
272 SSVAL(result,smb_uid,0);
273 SSVAL(result,smb_mid,0xFFFF);
274 SCVAL(result,smb_vwv0,0xFF);
275 SSVAL(result,smb_vwv2,fsp->fnum);
276 SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
277 SCVAL(result,smb_vwv3+1,cmd);
278 return result;
279}
280
281/****************************************************************************
282 Function to do the waiting before sending a local break.
283****************************************************************************/
284
285static void wait_before_sending_break(void)
286{
287 long wait_time = (long)lp_oplock_break_wait_time();
288
289 if (wait_time) {
290 smb_msleep(wait_time);
291 }
292}
293
294/****************************************************************************
295 Ensure that we have a valid oplock.
296****************************************************************************/
297
298static files_struct *initial_break_processing(struct file_id id, unsigned long file_id)
299{
300 files_struct *fsp = NULL;
301
302 if( DEBUGLVL( 3 ) ) {
303 dbgtext( "initial_break_processing: called for %s/%u\n",
304 file_id_string_tos(&id), (int)file_id);
305 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
306 exclusive_oplocks_open, level_II_oplocks_open );
307 }
308
309 /*
310 * We need to search the file open table for the
311 * entry containing this dev and inode, and ensure
312 * we have an oplock on it.
313 */
314
315 fsp = file_find_dif(id, file_id);
316
317 if(fsp == NULL) {
318 /* The file could have been closed in the meantime - return success. */
319 if( DEBUGLVL( 3 ) ) {
320 dbgtext( "initial_break_processing: cannot find open file with " );
321 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
322 dbgtext( "allowing break to succeed.\n" );
323 }
324 return NULL;
325 }
326
327 /* Ensure we have an oplock on the file */
328
329 /*
330 * There is a potential race condition in that an oplock could
331 * have been broken due to another udp request, and yet there are
332 * still oplock break messages being sent in the udp message
333 * queue for this file. So return true if we don't have an oplock,
334 * as we may have just freed it.
335 */
336
337 if(fsp->oplock_type == NO_OPLOCK) {
338 if( DEBUGLVL( 3 ) ) {
339 dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
340 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
341 file_id_string_tos(&id), fsp->fh->gen_id );
342 dbgtext( "Allowing break to succeed regardless.\n" );
343 }
344 return NULL;
345 }
346
347 return fsp;
348}
349
350static void oplock_timeout_handler(struct event_context *ctx,
351 struct timed_event *te,
352 struct timeval now,
353 void *private_data)
354{
355 files_struct *fsp = (files_struct *)private_data;
356
357 /* Remove the timed event handler. */
358 TALLOC_FREE(fsp->oplock_timeout);
359 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp->fsp_name));
360 global_client_failed_oplock_break = True;
361 remove_oplock(fsp);
362 reply_to_oplock_break_requests(fsp);
363}
364
365/*******************************************************************
366 Add a timeout handler waiting for the client reply.
367*******************************************************************/
368
369static void add_oplock_timeout_handler(files_struct *fsp)
370{
371 if (fsp->oplock_timeout != NULL) {
372 DEBUG(0, ("Logic problem -- have an oplock event hanging "
373 "around\n"));
374 }
375
376 fsp->oplock_timeout =
377 event_add_timed(smbd_event_context(), NULL,
378 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
379 oplock_timeout_handler, fsp);
380
381 if (fsp->oplock_timeout == NULL) {
382 DEBUG(0, ("Could not add oplock timeout handler\n"));
383 }
384}
385
386/*******************************************************************
387 This handles the case of a write triggering a break to none
388 message on a level2 oplock.
389 When we get this message we may be in any of three states :
390 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
391 the client for LEVEL2.
392*******************************************************************/
393
394static void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
395 void *private_data,
396 uint32_t msg_type,
397 struct server_id src,
398 DATA_BLOB *data)
399{
400 struct share_mode_entry msg;
401 files_struct *fsp;
402 char *break_msg;
403 bool sign_state;
404
405 if (data->data == NULL) {
406 DEBUG(0, ("Got NULL buffer\n"));
407 return;
408 }
409
410 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
411 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
412 return;
413 }
414
415 /* De-linearize incoming message. */
416 message_to_share_mode_entry(&msg, (char *)data->data);
417
418 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
419 "%s/%lu\n", procid_str(debug_ctx(), &src),
420 file_id_string_tos(&msg.id), msg.share_file_id));
421
422 fsp = initial_break_processing(msg.id, msg.share_file_id);
423
424 if (fsp == NULL) {
425 /* We hit a race here. Break messages are sent, and before we
426 * get to process this message, we have closed the file.
427 * No need to reply as this is an async message. */
428 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
429 return;
430 }
431
432 if (fsp->oplock_type == NO_OPLOCK) {
433 /* We already got a "break to none" message and we've handled it.
434 * just ignore. */
435 DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
436 return;
437 }
438
439 if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
440 /* Don't tell the client, just downgrade. */
441 DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
442 remove_oplock(fsp);
443 return;
444 }
445
446 /* Ensure we're really at level2 state. */
447 SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
448
449 DEBUG(10,("process_oplock_async_level2_break_message: sending break to "
450 "none message for fid %d, file %s\n",
451 fsp->fnum,
452 fsp->fsp_name));
453
454 /* Now send a break to none message to our client. */
455
456 break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
457 if (break_msg == NULL) {
458 exit_server("Could not talloc break_msg\n");
459 }
460
461 /* Need to wait before sending a break message if we sent ourselves this message. */
462 if (procid_is_me(&src)) {
463 wait_before_sending_break();
464 }
465
466 /* Save the server smb signing state. */
467 sign_state = srv_oplock_set_signing(False);
468
469 show_msg(break_msg);
470 if (!srv_send_smb(smbd_server_fd(),
471 break_msg,
472 IS_CONN_ENCRYPTED(fsp->conn))) {
473 exit_server_cleanly("oplock_break: srv_send_smb failed.");
474 }
475
476 /* Restore the sign state to what it was. */
477 srv_oplock_set_signing(sign_state);
478
479 TALLOC_FREE(break_msg);
480
481 /* Async level2 request, don't send a reply, just remove the oplock. */
482 remove_oplock(fsp);
483}
484
485/*******************************************************************
486 This handles the generic oplock break message from another smbd.
487*******************************************************************/
488
489static void process_oplock_break_message(struct messaging_context *msg_ctx,
490 void *private_data,
491 uint32_t msg_type,
492 struct server_id src,
493 DATA_BLOB *data)
494{
495 struct share_mode_entry msg;
496 files_struct *fsp;
497 char *break_msg;
498 bool break_to_level2 = False;
499 bool sign_state;
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/%lu\n",
515 procid_str(debug_ctx(), &src), file_id_string_tos(&msg.id),
516 msg.share_file_id));
517
518 fsp = initial_break_processing(msg.id, msg.share_file_id);
519
520 if (fsp == NULL) {
521 /* a We hit race here. Break messages are sent, and before we
522 * get to process this message, we have closed the file. Reply
523 * with 'ok, oplock broken' */
524 DEBUG(3, ("Did not find fsp\n"));
525
526 /* We just send the same message back. */
527 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
528 (uint8 *)data->data,
529 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
530 return;
531 }
532
533 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
534 /* Remember we have to inform the requesting PID when the
535 * client replies */
536 msg.pid = src;
537 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
538 &fsp->pending_break_messages,
539 &fsp->num_pending_break_messages);
540 return;
541 }
542
543 if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
544 !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
545 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
546 file_id_string_tos(&fsp->file_id),
547 fsp->fsp_name));
548 /* We just send the same message back. */
549 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
550 (uint8 *)data->data,
551 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
552 return;
553 }
554
555 if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
556 !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
557 !koplocks && /* NOTE: we force levelII off for kernel oplocks -
558 * this will change when it is supported */
559 lp_level2_oplocks(SNUM(fsp->conn))) {
560 break_to_level2 = True;
561 }
562
563 break_msg = new_break_smb_message(NULL, fsp, break_to_level2 ?
564 OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
565 if (break_msg == NULL) {
566 exit_server("Could not talloc break_msg\n");
567 }
568
569 /* Need to wait before sending a break message if we sent ourselves this message. */
570 if (procid_is_me(&src)) {
571 wait_before_sending_break();
572 }
573
574 /* Save the server smb signing state. */
575 sign_state = srv_oplock_set_signing(False);
576
577 show_msg(break_msg);
578 if (!srv_send_smb(smbd_server_fd(),
579 break_msg,
580 IS_CONN_ENCRYPTED(fsp->conn))) {
581 exit_server_cleanly("oplock_break: srv_send_smb failed.");
582 }
583
584 /* Restore the sign state to what it was. */
585 srv_oplock_set_signing(sign_state);
586
587 TALLOC_FREE(break_msg);
588
589 fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
590
591 msg.pid = src;
592 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
593 &fsp->pending_break_messages,
594 &fsp->num_pending_break_messages);
595
596 add_oplock_timeout_handler(fsp);
597}
598
599/*******************************************************************
600 This handles the kernel oplock break message.
601*******************************************************************/
602
603static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
604 void *private_data,
605 uint32_t msg_type,
606 struct server_id src,
607 DATA_BLOB *data)
608{
609 struct file_id id;
610 unsigned long file_id;
611 files_struct *fsp;
612 char *break_msg;
613 bool sign_state;
614
615 if (data->data == NULL) {
616 DEBUG(0, ("Got NULL buffer\n"));
617 return;
618 }
619
620 if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
621 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
622 return;
623 }
624
625 /* Pull the data from the message. */
626 pull_file_id_16((char *)data->data, &id);
627 file_id = (unsigned long)IVAL(data->data, 16);
628
629 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
630 procid_str(debug_ctx(), &src), file_id_string_tos(&id),
631 (unsigned int)file_id));
632
633 fsp = initial_break_processing(id, file_id);
634
635 if (fsp == NULL) {
636 DEBUG(3, ("Got a kernel oplock break message for a file "
637 "I don't know about\n"));
638 return;
639 }
640
641 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
642 /* This is ok, kernel oplocks come in completely async */
643 DEBUG(3, ("Got a kernel oplock request while waiting for a "
644 "break reply\n"));
645 return;
646 }
647
648 break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
649 if (break_msg == NULL) {
650 exit_server("Could not talloc break_msg\n");
651 }
652
653 /* Save the server smb signing state. */
654 sign_state = srv_oplock_set_signing(False);
655
656 show_msg(break_msg);
657 if (!srv_send_smb(smbd_server_fd(),
658 break_msg,
659 IS_CONN_ENCRYPTED(fsp->conn))) {
660 exit_server_cleanly("oplock_break: srv_send_smb failed.");
661 }
662
663 /* Restore the sign state to what it was. */
664 srv_oplock_set_signing(sign_state);
665
666 TALLOC_FREE(break_msg);
667
668 fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
669
670 add_oplock_timeout_handler(fsp);
671}
672
673void reply_to_oplock_break_requests(files_struct *fsp)
674{
675 int i;
676
677 for (i=0; i<fsp->num_pending_break_messages; i++) {
678 struct share_mode_entry *e = &fsp->pending_break_messages[i];
679 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
680
681 share_mode_entry_to_message(msg, e);
682
683 messaging_send_buf(smbd_messaging_context(), e->pid,
684 MSG_SMB_BREAK_RESPONSE,
685 (uint8 *)msg,
686 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
687 }
688
689 SAFE_FREE(fsp->pending_break_messages);
690 fsp->num_pending_break_messages = 0;
691 if (fsp->oplock_timeout != NULL) {
692 /* Remove the timed event handler. */
693 TALLOC_FREE(fsp->oplock_timeout);
694 fsp->oplock_timeout = NULL;
695 }
696 return;
697}
698
699static void process_oplock_break_response(struct messaging_context *msg_ctx,
700 void *private_data,
701 uint32_t msg_type,
702 struct server_id src,
703 DATA_BLOB *data)
704{
705 struct share_mode_entry msg;
706
707 if (data->data == NULL) {
708 DEBUG(0, ("Got NULL buffer\n"));
709 return;
710 }
711
712 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
713 DEBUG(0, ("Got invalid msg len %u\n",
714 (unsigned int)data->length));
715 return;
716 }
717
718 /* De-linearize incoming message. */
719 message_to_share_mode_entry(&msg, (char *)data->data);
720
721 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %u\n",
722 procid_str(debug_ctx(), &src), file_id_string_tos(&msg.id),
723 msg.share_file_id, (unsigned int)msg.op_mid));
724
725 /* Here's the hack from open.c, store the mid in the 'port' field */
726 schedule_deferred_open_smb_message(msg.op_mid);
727}
728
729static void process_open_retry_message(struct messaging_context *msg_ctx,
730 void *private_data,
731 uint32_t msg_type,
732 struct server_id src,
733 DATA_BLOB *data)
734{
735 struct share_mode_entry msg;
736
737 if (data->data == NULL) {
738 DEBUG(0, ("Got NULL buffer\n"));
739 return;
740 }
741
742 if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
743 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
744 return;
745 }
746
747 /* De-linearize incoming message. */
748 message_to_share_mode_entry(&msg, (char *)data->data);
749
750 DEBUG(10, ("Got open retry msg from pid %s: %s mid %u\n",
751 procid_str(debug_ctx(), &src), file_id_string_tos(&msg.id),
752 (unsigned int)msg.op_mid));
753
754 schedule_deferred_open_smb_message(msg.op_mid);
755}
756
757/****************************************************************************
758 This function is called on any file modification or lock request. If a file
759 is level 2 oplocked then it must tell all other level 2 holders to break to
760 none.
761****************************************************************************/
762
763void release_level_2_oplocks_on_change(files_struct *fsp)
764{
765 int i;
766 struct share_mode_lock *lck;
767
768 /*
769 * If this file is level II oplocked then we need
770 * to grab the shared memory lock and inform all
771 * other files with a level II lock that they need
772 * to flush their read caches. We keep the lock over
773 * the shared memory area whilst doing this.
774 */
775
776 if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
777 return;
778
779 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
780 NULL);
781 if (lck == NULL) {
782 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
783 "share mode entry for file %s.\n", fsp->fsp_name ));
784 return;
785 }
786
787 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
788 lck->num_share_modes ));
789
790 for(i = 0; i < lck->num_share_modes; i++) {
791 struct share_mode_entry *share_entry = &lck->share_modes[i];
792 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
793
794 if (!is_valid_share_mode_entry(share_entry)) {
795 continue;
796 }
797
798 /*
799 * As there could have been multiple writes waiting at the
800 * lock_share_entry gate we may not be the first to
801 * enter. Hence the state of the op_types in the share mode
802 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
803 * oplock. It will do no harm to re-send break messages to
804 * those smbd's that are still waiting their turn to remove
805 * their LEVEL_II state, and also no harm to ignore existing
806 * NO_OPLOCK states. JRA.
807 */
808
809 DEBUG(10,("release_level_2_oplocks_on_change: "
810 "share_entry[%i]->op_type == %d\n",
811 i, share_entry->op_type ));
812
813 if (share_entry->op_type == NO_OPLOCK) {
814 continue;
815 }
816
817 /* Paranoia .... */
818 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
819 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
820 "share mode entry %d is an exlusive "
821 "oplock !\n", i ));
822 TALLOC_FREE(lck);
823 abort();
824 }
825
826 share_mode_entry_to_message(msg, share_entry);
827
828 /*
829 * Deal with a race condition when breaking level2
830 * oplocks. Don't send all the messages and release
831 * the lock, this allows someone else to come in and
832 * get a level2 lock before any of the messages are
833 * processed, and thus miss getting a break message.
834 * Ensure at least one entry (the one we're breaking)
835 * is processed immediately under the lock and becomes
836 * set as NO_OPLOCK to stop any waiter getting a level2.
837 * Bugid #5979.
838 */
839
840 if (procid_is_me(&share_entry->pid)) {
841 DATA_BLOB blob = data_blob_const(msg,
842 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
843 process_oplock_async_level2_break_message(smbd_messaging_context(),
844 NULL,
845 MSG_SMB_ASYNC_LEVEL2_BREAK,
846 share_entry->pid,
847 &blob);
848 } else {
849 messaging_send_buf(smbd_messaging_context(),
850 share_entry->pid,
851 MSG_SMB_ASYNC_LEVEL2_BREAK,
852 (uint8 *)msg,
853 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
854 }
855 }
856
857 /* We let the message receivers handle removing the oplock state
858 in the share mode lock db. */
859
860 TALLOC_FREE(lck);
861}
862
863/****************************************************************************
864 Linearize a share mode entry struct to an internal oplock break message.
865****************************************************************************/
866
867void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
868{
869 SIVAL(msg,0,(uint32)e->pid.pid);
870 SSVAL(msg,4,e->op_mid);
871 SSVAL(msg,6,e->op_type);
872 SIVAL(msg,8,e->access_mask);
873 SIVAL(msg,12,e->share_access);
874 SIVAL(msg,16,e->private_options);
875 SIVAL(msg,20,(uint32)e->time.tv_sec);
876 SIVAL(msg,24,(uint32)e->time.tv_usec);
877 push_file_id_16(msg+28, &e->id);
878 SIVAL(msg,44,e->share_file_id);
879 SIVAL(msg,48,e->uid);
880 SSVAL(msg,52,e->flags);
881#ifdef CLUSTER_SUPPORT
882 SIVAL(msg,54,e->pid.vnn);
883#endif
884}
885
886/****************************************************************************
887 De-linearize an internal oplock break message to a share mode entry struct.
888****************************************************************************/
889
890void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
891{
892 e->pid.pid = (pid_t)IVAL(msg,0);
893 e->op_mid = SVAL(msg,4);
894 e->op_type = SVAL(msg,6);
895 e->access_mask = IVAL(msg,8);
896 e->share_access = IVAL(msg,12);
897 e->private_options = IVAL(msg,16);
898 e->time.tv_sec = (time_t)IVAL(msg,20);
899 e->time.tv_usec = (int)IVAL(msg,24);
900 pull_file_id_16(msg+28, &e->id);
901 e->share_file_id = (unsigned long)IVAL(msg,44);
902 e->uid = (uint32)IVAL(msg,48);
903 e->flags = (uint16)SVAL(msg,52);
904#ifdef CLUSTER_SUPPORT
905 e->pid.vnn = IVAL(msg,54);
906#endif
907}
908
909/****************************************************************************
910 Setup oplocks for this process.
911****************************************************************************/
912
913bool init_oplocks(struct messaging_context *msg_ctx)
914{
915 DEBUG(3,("init_oplocks: initializing messages.\n"));
916
917 messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_REQUEST,
918 process_oplock_break_message);
919 messaging_register(msg_ctx, NULL, MSG_SMB_ASYNC_LEVEL2_BREAK,
920 process_oplock_async_level2_break_message);
921 messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_RESPONSE,
922 process_oplock_break_response);
923 messaging_register(msg_ctx, NULL, MSG_SMB_KERNEL_BREAK,
924 process_kernel_oplock_break);
925 messaging_register(msg_ctx, NULL, MSG_SMB_OPEN_RETRY,
926 process_open_retry_message);
927
928 if (lp_kernel_oplocks()) {
929#if HAVE_KERNEL_OPLOCKS_IRIX
930 koplocks = irix_init_kernel_oplocks();
931#elif HAVE_KERNEL_OPLOCKS_LINUX
932 koplocks = linux_init_kernel_oplocks();
933#endif
934 }
935
936 return True;
937}
Note: See TracBrowser for help on using the repository browser.