source: vendor/3.5.0/source3/smbd/blocking.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 23.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Blocking Locking functions
4 Copyright (C) Jeremy Allison 1998-2003
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21#include "smbd/globals.h"
22
23#undef DBGC_CLASS
24#define DBGC_CLASS DBGC_LOCKING
25
26/****************************************************************************
27 Determine if this is a secondary element of a chained SMB.
28 **************************************************************************/
29
30static void received_unlock_msg(struct messaging_context *msg,
31 void *private_data,
32 uint32_t msg_type,
33 struct server_id server_id,
34 DATA_BLOB *data);
35
36static void brl_timeout_fn(struct event_context *event_ctx,
37 struct timed_event *te,
38 struct timeval now,
39 void *private_data)
40{
41 SMB_ASSERT(brl_timeout == te);
42 TALLOC_FREE(brl_timeout);
43
44 change_to_root_user(); /* TODO: Possibly run all timed events as
45 * root */
46
47 process_blocking_lock_queue();
48}
49
50/****************************************************************************
51 We need a version of timeval_min that treats zero timval as infinite.
52****************************************************************************/
53
54static struct timeval timeval_brl_min(const struct timeval *tv1,
55 const struct timeval *tv2)
56{
57 if (timeval_is_zero(tv1)) {
58 return *tv2;
59 }
60 if (timeval_is_zero(tv2)) {
61 return *tv1;
62 }
63 return timeval_min(tv1, tv2);
64}
65
66/****************************************************************************
67 After a change to blocking_lock_queue, recalculate the timed_event for the
68 next processing.
69****************************************************************************/
70
71static bool recalc_brl_timeout(void)
72{
73 struct blocking_lock_record *blr;
74 struct timeval next_timeout;
75
76 TALLOC_FREE(brl_timeout);
77
78 next_timeout = timeval_zero();
79
80 for (blr = blocking_lock_queue; blr; blr = blr->next) {
81 if (timeval_is_zero(&blr->expire_time)) {
82 /*
83 * If we're blocked on pid 0xFFFFFFFF this is
84 * a POSIX lock, so calculate a timeout of
85 * 10 seconds into the future.
86 */
87 if (blr->blocking_pid == 0xFFFFFFFF) {
88 struct timeval psx_to = timeval_current_ofs(10, 0);
89 next_timeout = timeval_brl_min(&next_timeout, &psx_to);
90 }
91
92 continue;
93 }
94
95 next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
96 }
97
98 if (timeval_is_zero(&next_timeout)) {
99 DEBUG(10, ("Next timeout = Infinite.\n"));
100 return True;
101 }
102
103 if (DEBUGLVL(10)) {
104 struct timeval cur, from_now;
105
106 cur = timeval_current();
107 from_now = timeval_until(&cur, &next_timeout);
108 DEBUG(10, ("Next timeout = %d.%d seconds from now.\n",
109 (int)from_now.tv_sec, (int)from_now.tv_usec));
110 }
111
112 if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL,
113 next_timeout,
114 brl_timeout_fn, NULL))) {
115 return False;
116 }
117
118 return True;
119}
120
121
122/****************************************************************************
123 Function to push a blocking lock request onto the lock queue.
124****************************************************************************/
125
126bool push_blocking_lock_request( struct byte_range_lock *br_lck,
127 struct smb_request *req,
128 files_struct *fsp,
129 int lock_timeout,
130 int lock_num,
131 uint32_t lock_pid,
132 enum brl_type lock_type,
133 enum brl_flavour lock_flav,
134 uint64_t offset,
135 uint64_t count,
136 uint32_t blocking_pid)
137{
138 struct blocking_lock_record *blr;
139 NTSTATUS status;
140
141 if(req_is_in_chain(req)) {
142 DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
143 return False;
144 }
145
146 /*
147 * Now queue an entry on the blocking lock queue. We setup
148 * the expiration time here.
149 */
150
151 blr = talloc(NULL, struct blocking_lock_record);
152 if (blr == NULL) {
153 DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
154 return False;
155 }
156
157 blr->next = NULL;
158 blr->prev = NULL;
159
160 blr->fsp = fsp;
161 if (lock_timeout == -1) {
162 blr->expire_time.tv_sec = 0;
163 blr->expire_time.tv_usec = 0; /* Never expire. */
164 } else {
165 blr->expire_time = timeval_current_ofs(lock_timeout/1000,
166 (lock_timeout % 1000) * 1000);
167 }
168 blr->lock_num = lock_num;
169 blr->lock_pid = lock_pid;
170 blr->blocking_pid = blocking_pid;
171 blr->lock_flav = lock_flav;
172 blr->lock_type = lock_type;
173 blr->offset = offset;
174 blr->count = count;
175
176 /* Specific brl_lock() implementations can fill this in. */
177 blr->blr_private = NULL;
178
179 /* Add a pending lock record for this. */
180 status = brl_lock(smbd_messaging_context(),
181 br_lck,
182 lock_pid,
183 procid_self(),
184 offset,
185 count,
186 lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
187 blr->lock_flav,
188 True,
189 NULL,
190 blr);
191
192 if (!NT_STATUS_IS_OK(status)) {
193 DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
194 TALLOC_FREE(blr);
195 return False;
196 }
197
198 SMB_PERFCOUNT_DEFER_OP(&req->pcd, &req->pcd);
199 blr->req = talloc_move(blr, &req);
200
201 DLIST_ADD_END(blocking_lock_queue, blr, struct blocking_lock_record *);
202 recalc_brl_timeout();
203
204 /* Ensure we'll receive messages when this is unlocked. */
205 if (!blocking_lock_unlock_state) {
206 messaging_register(smbd_messaging_context(), NULL,
207 MSG_SMB_UNLOCK, received_unlock_msg);
208 blocking_lock_unlock_state = true;
209 }
210
211 DEBUG(3,("push_blocking_lock_request: lock request blocked with "
212 "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
213 (unsigned int)blr->expire_time.tv_sec,
214 (unsigned int)blr->expire_time.tv_usec, lock_timeout,
215 blr->fsp->fnum, fsp_str_dbg(blr->fsp)));
216
217 return True;
218}
219
220/****************************************************************************
221 Return a lockingX success SMB.
222*****************************************************************************/
223
224static void reply_lockingX_success(struct blocking_lock_record *blr)
225{
226 reply_outbuf(blr->req, 2, 0);
227
228 /*
229 * As this message is a lockingX call we must handle
230 * any following chained message correctly.
231 * This is normally handled in construct_reply(),
232 * but as that calls switch_message, we can't use
233 * that here and must set up the chain info manually.
234 */
235
236 chain_reply(blr->req);
237 TALLOC_FREE(blr->req->outbuf);
238}
239
240/****************************************************************************
241 Return a generic lock fail error blocking call.
242*****************************************************************************/
243
244static void generic_blocking_lock_error(struct blocking_lock_record *blr, NTSTATUS status)
245{
246 /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
247 FILE_LOCK_CONFLICT! (tridge) */
248 if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
249 status = NT_STATUS_FILE_LOCK_CONFLICT;
250 }
251
252 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
253 /* Store the last lock error. */
254 files_struct *fsp = blr->fsp;
255
256 if (fsp) {
257 fsp->last_lock_failure.context.smbpid = blr->lock_pid;
258 fsp->last_lock_failure.context.tid = fsp->conn->cnum;
259 fsp->last_lock_failure.context.pid = procid_self();
260 fsp->last_lock_failure.start = blr->offset;
261 fsp->last_lock_failure.size = blr->count;
262 fsp->last_lock_failure.fnum = fsp->fnum;
263 fsp->last_lock_failure.lock_type = READ_LOCK; /* Don't care. */
264 fsp->last_lock_failure.lock_flav = blr->lock_flav;
265 }
266 }
267
268 reply_nterror(blr->req, status);
269 if (!srv_send_smb(smbd_server_fd(), (char *)blr->req->outbuf,
270 true, blr->req->seqnum+1,
271 blr->req->encrypted, NULL)) {
272 exit_server_cleanly("generic_blocking_lock_error: srv_send_smb failed.");
273 }
274 TALLOC_FREE(blr->req->outbuf);
275}
276
277/****************************************************************************
278 Return a lock fail error for a lockingX call. Undo all the locks we have
279 obtained first.
280*****************************************************************************/
281
282static void reply_lockingX_error(struct blocking_lock_record *blr, NTSTATUS status)
283{
284 files_struct *fsp = blr->fsp;
285 uint16 num_ulocks = SVAL(blr->req->vwv+6, 0);
286 uint64_t count = (uint64_t)0, offset = (uint64_t) 0;
287 uint32 lock_pid;
288 unsigned char locktype = CVAL(blr->req->vwv+3, 0);
289 bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
290 uint8_t *data;
291 int i;
292
293 data = (uint8_t *)blr->req->buf
294 + ((large_file_format ? 20 : 10)*num_ulocks);
295
296 /*
297 * Data now points at the beginning of the list
298 * of smb_lkrng structs.
299 */
300
301 /*
302 * Ensure we don't do a remove on the lock that just failed,
303 * as under POSIX rules, if we have a lock already there, we
304 * will delete it (and we shouldn't) .....
305 */
306
307 for(i = blr->lock_num - 1; i >= 0; i--) {
308 bool err;
309
310 lock_pid = get_lock_pid( data, i, large_file_format);
311 count = get_lock_count( data, i, large_file_format);
312 offset = get_lock_offset( data, i, large_file_format, &err);
313
314 /*
315 * We know err cannot be set as if it was the lock
316 * request would never have been queued. JRA.
317 */
318
319 do_unlock(smbd_messaging_context(),
320 fsp,
321 lock_pid,
322 count,
323 offset,
324 WINDOWS_LOCK);
325 }
326
327 generic_blocking_lock_error(blr, status);
328}
329
330/****************************************************************************
331 Return a lock fail error.
332*****************************************************************************/
333
334static void blocking_lock_reply_error(struct blocking_lock_record *blr, NTSTATUS status)
335{
336 DEBUG(10, ("Replying with error=%s. BLR = %p\n", nt_errstr(status), blr));
337
338 switch(blr->req->cmd) {
339 case SMBlockingX:
340 reply_lockingX_error(blr, status);
341 break;
342 case SMBtrans2:
343 case SMBtranss2:
344 reply_nterror(blr->req, status);
345
346 /*
347 * construct_reply_common has done us the favor to pre-fill
348 * the command field with SMBtranss2 which is wrong :-)
349 */
350 SCVAL(blr->req->outbuf,smb_com,SMBtrans2);
351
352 if (!srv_send_smb(smbd_server_fd(),
353 (char *)blr->req->outbuf,
354 true, blr->req->seqnum+1,
355 IS_CONN_ENCRYPTED(blr->fsp->conn),
356 NULL)) {
357 exit_server_cleanly("blocking_lock_reply_error: "
358 "srv_send_smb failed.");
359 }
360 TALLOC_FREE(blr->req->outbuf);
361 break;
362 default:
363 DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
364 exit_server("PANIC - unknown type on blocking lock queue");
365 }
366}
367
368/****************************************************************************
369 Attempt to finish off getting all pending blocking locks for a lockingX call.
370 Returns True if we want to be removed from the list.
371*****************************************************************************/
372
373static bool process_lockingX(struct blocking_lock_record *blr)
374{
375 unsigned char locktype = CVAL(blr->req->vwv+3, 0);
376 files_struct *fsp = blr->fsp;
377 uint16 num_ulocks = SVAL(blr->req->vwv+6, 0);
378 uint16 num_locks = SVAL(blr->req->vwv+7, 0);
379 uint64_t count = (uint64_t)0, offset = (uint64_t)0;
380 uint32 lock_pid;
381 bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
382 uint8_t *data;
383 NTSTATUS status = NT_STATUS_OK;
384
385 data = (uint8_t *)blr->req->buf
386 + ((large_file_format ? 20 : 10)*num_ulocks);
387
388 /*
389 * Data now points at the beginning of the list
390 * of smb_lkrng structs.
391 */
392
393 for(; blr->lock_num < num_locks; blr->lock_num++) {
394 struct byte_range_lock *br_lck = NULL;
395 bool err;
396
397 lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
398 count = get_lock_count( data, blr->lock_num, large_file_format);
399 offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
400
401 /*
402 * We know err cannot be set as if it was the lock
403 * request would never have been queued. JRA.
404 */
405 errno = 0;
406 br_lck = do_lock(smbd_messaging_context(),
407 fsp,
408 lock_pid,
409 count,
410 offset,
411 ((locktype & LOCKING_ANDX_SHARED_LOCK) ?
412 READ_LOCK : WRITE_LOCK),
413 WINDOWS_LOCK,
414 True,
415 &status,
416 &blr->blocking_pid,
417 blr);
418
419 TALLOC_FREE(br_lck);
420
421 if (NT_STATUS_IS_ERR(status)) {
422 break;
423 }
424 }
425
426 if(blr->lock_num == num_locks) {
427 /*
428 * Success - we got all the locks.
429 */
430
431 DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d "
432 "num_locks=%d\n", fsp_str_dbg(fsp), fsp->fnum,
433 (unsigned int)locktype, num_locks));
434
435 reply_lockingX_success(blr);
436 return True;
437 }
438
439 if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
440 !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
441 /*
442 * We have other than a "can't get lock"
443 * error. Free any locks we had and return an error.
444 * Return True so we get dequeued.
445 */
446 blocking_lock_reply_error(blr, status);
447 return True;
448 }
449
450 /*
451 * Still can't get all the locks - keep waiting.
452 */
453
454 DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
455Waiting....\n",
456 blr->lock_num, num_locks, fsp_str_dbg(fsp), fsp->fnum));
457
458 return False;
459}
460
461/****************************************************************************
462 Attempt to get the posix lock request from a SMBtrans2 call.
463 Returns True if we want to be removed from the list.
464*****************************************************************************/
465
466static bool process_trans2(struct blocking_lock_record *blr)
467{
468 char params[2];
469 NTSTATUS status;
470 struct byte_range_lock *br_lck = do_lock(smbd_messaging_context(),
471 blr->fsp,
472 blr->lock_pid,
473 blr->count,
474 blr->offset,
475 blr->lock_type,
476 blr->lock_flav,
477 True,
478 &status,
479 &blr->blocking_pid,
480 blr);
481 TALLOC_FREE(br_lck);
482
483 if (!NT_STATUS_IS_OK(status)) {
484 if (ERROR_WAS_LOCK_DENIED(status)) {
485 /* Still can't get the lock, just keep waiting. */
486 return False;
487 }
488 /*
489 * We have other than a "can't get lock"
490 * error. Send an error and return True so we get dequeued.
491 */
492 blocking_lock_reply_error(blr, status);
493 return True;
494 }
495
496 /* We finally got the lock, return success. */
497
498 SSVAL(params,0,0);
499 /* Fake up max_data_bytes here - we know it fits. */
500 send_trans2_replies(blr->fsp->conn, blr->req, params, 2, NULL, 0, 0xffff);
501 return True;
502}
503
504
505/****************************************************************************
506 Process a blocking lock SMB.
507 Returns True if we want to be removed from the list.
508*****************************************************************************/
509
510static bool blocking_lock_record_process(struct blocking_lock_record *blr)
511{
512 switch(blr->req->cmd) {
513 case SMBlockingX:
514 return process_lockingX(blr);
515 case SMBtrans2:
516 case SMBtranss2:
517 return process_trans2(blr);
518 default:
519 DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
520 exit_server("PANIC - unknown type on blocking lock queue");
521 }
522 return False; /* Keep compiler happy. */
523}
524
525/****************************************************************************
526 Cancel entries by fnum from the blocking lock pending queue.
527*****************************************************************************/
528
529void cancel_pending_lock_requests_by_fid(files_struct *fsp, struct byte_range_lock *br_lck)
530{
531 struct blocking_lock_record *blr, *blr_cancelled, *next = NULL;
532
533 for(blr = blocking_lock_queue; blr; blr = next) {
534 unsigned char locktype = 0;
535
536 next = blr->next;
537 if (blr->fsp->fnum != fsp->fnum) {
538 continue;
539 }
540
541 if (blr->req->cmd == SMBlockingX) {
542 locktype = CVAL(blr->req->vwv+3, 0);
543 }
544
545 DEBUG(10, ("remove_pending_lock_requests_by_fid - removing "
546 "request type %d for file %s fnum = %d\n",
547 blr->req->cmd, fsp_str_dbg(fsp), fsp->fnum));
548
549 blr_cancelled = blocking_lock_cancel(fsp,
550 blr->lock_pid,
551 blr->offset,
552 blr->count,
553 blr->lock_flav,
554 locktype,
555 NT_STATUS_RANGE_NOT_LOCKED);
556
557 SMB_ASSERT(blr_cancelled == blr);
558
559 brl_lock_cancel(br_lck,
560 blr->lock_pid,
561 procid_self(),
562 blr->offset,
563 blr->count,
564 blr->lock_flav,
565 blr);
566
567 /* We're closing the file fsp here, so ensure
568 * we don't have a dangling pointer. */
569 blr->fsp = NULL;
570 }
571}
572
573/****************************************************************************
574 Delete entries by mid from the blocking lock pending queue. Always send reply.
575*****************************************************************************/
576
577void remove_pending_lock_requests_by_mid(int mid)
578{
579 struct blocking_lock_record *blr, *next = NULL;
580
581 for(blr = blocking_lock_queue; blr; blr = next) {
582 files_struct *fsp;
583 struct byte_range_lock *br_lck;
584
585 next = blr->next;
586
587 if (blr->req->mid != mid) {
588 continue;
589 }
590
591 fsp = blr->fsp;
592 br_lck = brl_get_locks(talloc_tos(), fsp);
593
594 if (br_lck) {
595 DEBUG(10, ("remove_pending_lock_requests_by_mid - "
596 "removing request type %d for file %s fnum "
597 "= %d\n", blr->req->cmd, fsp_str_dbg(fsp),
598 fsp->fnum ));
599
600 brl_lock_cancel(br_lck,
601 blr->lock_pid,
602 procid_self(),
603 blr->offset,
604 blr->count,
605 blr->lock_flav,
606 blr);
607 TALLOC_FREE(br_lck);
608 }
609
610 blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
611 DLIST_REMOVE(blocking_lock_queue, blr);
612 TALLOC_FREE(blr);
613 }
614}
615
616/****************************************************************************
617 Is this mid a blocking lock request on the queue ?
618*****************************************************************************/
619
620bool blocking_lock_was_deferred(int mid)
621{
622 struct blocking_lock_record *blr, *next = NULL;
623
624 for(blr = blocking_lock_queue; blr; blr = next) {
625 next = blr->next;
626 if(blr->req->mid == mid) {
627 return True;
628 }
629 }
630 return False;
631}
632
633/****************************************************************************
634 Set a flag as an unlock request affects one of our pending locks.
635*****************************************************************************/
636
637static void received_unlock_msg(struct messaging_context *msg,
638 void *private_data,
639 uint32_t msg_type,
640 struct server_id server_id,
641 DATA_BLOB *data)
642{
643 DEBUG(10,("received_unlock_msg\n"));
644 process_blocking_lock_queue();
645}
646
647/****************************************************************************
648 Process the blocking lock queue. Note that this is only called as root.
649*****************************************************************************/
650
651void process_blocking_lock_queue(void)
652{
653 struct timeval tv_curr = timeval_current();
654 struct blocking_lock_record *blr, *next = NULL;
655
656 /*
657 * Go through the queue and see if we can get any of the locks.
658 */
659
660 for (blr = blocking_lock_queue; blr; blr = next) {
661
662 next = blr->next;
663
664 /*
665 * Go through the remaining locks and try and obtain them.
666 * The call returns True if all locks were obtained successfully
667 * and False if we still need to wait.
668 */
669
670 DEBUG(10, ("Processing BLR = %p\n", blr));
671
672 /* We use set_current_service so connections with
673 * pending locks are not marked as idle.
674 */
675
676 set_current_service(blr->fsp->conn,
677 SVAL(blr->req->inbuf,smb_flg),
678 false);
679
680 if(blocking_lock_record_process(blr)) {
681 struct byte_range_lock *br_lck = brl_get_locks(
682 talloc_tos(), blr->fsp);
683
684 DEBUG(10, ("BLR_process returned true: cancelling and "
685 "removing lock. BLR = %p\n", blr));
686
687 if (br_lck) {
688 brl_lock_cancel(br_lck,
689 blr->lock_pid,
690 procid_self(),
691 blr->offset,
692 blr->count,
693 blr->lock_flav,
694 blr);
695 TALLOC_FREE(br_lck);
696 }
697
698 DLIST_REMOVE(blocking_lock_queue, blr);
699 TALLOC_FREE(blr);
700 continue;
701 }
702
703 /*
704 * We couldn't get the locks for this record on the list.
705 * If the time has expired, return a lock error.
706 */
707
708 if (!timeval_is_zero(&blr->expire_time) && timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
709 struct byte_range_lock *br_lck = brl_get_locks(
710 talloc_tos(), blr->fsp);
711
712 DEBUG(10, ("Lock timed out! BLR = %p\n", blr));
713
714 /*
715 * Lock expired - throw away all previously
716 * obtained locks and return lock error.
717 */
718
719 if (br_lck) {
720 DEBUG(5,("process_blocking_lock_queue: "
721 "pending lock fnum = %d for file %s "
722 "timed out.\n", blr->fsp->fnum,
723 fsp_str_dbg(blr->fsp)));
724
725 brl_lock_cancel(br_lck,
726 blr->lock_pid,
727 procid_self(),
728 blr->offset,
729 blr->count,
730 blr->lock_flav,
731 blr);
732 TALLOC_FREE(br_lck);
733 }
734
735 blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
736 DLIST_REMOVE(blocking_lock_queue, blr);
737 TALLOC_FREE(blr);
738 }
739 }
740
741 recalc_brl_timeout();
742}
743
744/****************************************************************************
745 Handle a cancel message. Lock already moved onto the cancel queue.
746*****************************************************************************/
747
748#define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(struct blocking_lock_record *) + sizeof(NTSTATUS))
749
750static void process_blocking_lock_cancel_message(struct messaging_context *ctx,
751 void *private_data,
752 uint32_t msg_type,
753 struct server_id server_id,
754 DATA_BLOB *data)
755{
756 NTSTATUS err;
757 const char *msg = (const char *)data->data;
758 struct blocking_lock_record *blr;
759
760 if (data->data == NULL) {
761 smb_panic("process_blocking_lock_cancel_message: null msg");
762 }
763
764 if (data->length != MSG_BLOCKING_LOCK_CANCEL_SIZE) {
765 DEBUG(0, ("process_blocking_lock_cancel_message: "
766 "Got invalid msg len %d\n", (int)data->length));
767 smb_panic("process_blocking_lock_cancel_message: bad msg");
768 }
769
770 memcpy(&blr, msg, sizeof(blr));
771 memcpy(&err, &msg[sizeof(blr)], sizeof(NTSTATUS));
772
773 DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
774 nt_errstr(err) ));
775
776 blocking_lock_reply_error(blr, err);
777 DLIST_REMOVE(blocking_lock_cancelled_queue, blr);
778 TALLOC_FREE(blr);
779}
780
781/****************************************************************************
782 Send ourselves a blocking lock cancelled message. Handled asynchronously above.
783 Returns the blocking_lock_record that is being cancelled.
784*****************************************************************************/
785
786struct blocking_lock_record *blocking_lock_cancel(files_struct *fsp,
787 uint32 lock_pid,
788 uint64_t offset,
789 uint64_t count,
790 enum brl_flavour lock_flav,
791 unsigned char locktype,
792 NTSTATUS err)
793{
794 char msg[MSG_BLOCKING_LOCK_CANCEL_SIZE];
795 struct blocking_lock_record *blr;
796
797 if (!blocking_lock_cancel_state) {
798 /* Register our message. */
799 messaging_register(smbd_messaging_context(), NULL,
800 MSG_SMB_BLOCKING_LOCK_CANCEL,
801 process_blocking_lock_cancel_message);
802
803 blocking_lock_cancel_state = True;
804 }
805
806 for (blr = blocking_lock_queue; blr; blr = blr->next) {
807 if (fsp == blr->fsp &&
808 lock_pid == blr->lock_pid &&
809 offset == blr->offset &&
810 count == blr->count &&
811 lock_flav == blr->lock_flav) {
812 break;
813 }
814 }
815
816 if (!blr) {
817 return NULL;
818 }
819
820 /* Check the flags are right. */
821 if (blr->req->cmd == SMBlockingX &&
822 (locktype & LOCKING_ANDX_LARGE_FILES) !=
823 (CVAL(blr->req->vwv+3, 0) & LOCKING_ANDX_LARGE_FILES)) {
824 return NULL;
825 }
826
827 /* Move to cancelled queue. */
828 DLIST_REMOVE(blocking_lock_queue, blr);
829 DLIST_ADD(blocking_lock_cancelled_queue, blr);
830
831 /* Create the message. */
832 memcpy(msg, &blr, sizeof(blr));
833 memcpy(&msg[sizeof(blr)], &err, sizeof(NTSTATUS));
834
835 messaging_send_buf(smbd_messaging_context(), procid_self(),
836 MSG_SMB_BLOCKING_LOCK_CANCEL,
837 (uint8 *)&msg, sizeof(msg));
838
839 return blr;
840}
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