source: branches/samba-3.2.x/source/smbd/blocking.c@ 770

Last change on this file since 770 was 133, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.0pre3
File size: 25.9 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#undef DBGC_CLASS
22#define DBGC_CLASS DBGC_LOCKING
23
24/****************************************************************************
25 This is the structure to queue to implement blocking locks.
26 notify. It consists of the requesting SMB and the expiry time.
27*****************************************************************************/
28
29typedef struct _blocking_lock_record {
30 struct _blocking_lock_record *next;
31 struct _blocking_lock_record *prev;
32 int com_type;
33 files_struct *fsp;
34 struct timeval expire_time;
35 int lock_num;
36 SMB_BIG_UINT offset;
37 SMB_BIG_UINT count;
38 uint32 lock_pid;
39 uint32 blocking_pid; /* PID that blocks us. */
40 enum brl_flavour lock_flav;
41 enum brl_type lock_type;
42 char *inbuf;
43 int length;
44 bool encrypted;
45} blocking_lock_record;
46
47/* dlink list we store pending lock records on. */
48static blocking_lock_record *blocking_lock_queue;
49
50/* dlink list we move cancelled lock records onto. */
51static blocking_lock_record *blocking_lock_cancelled_queue;
52
53/* The event that makes us process our blocking lock queue */
54static struct timed_event *brl_timeout;
55
56/****************************************************************************
57 Destructor for the above structure.
58****************************************************************************/
59
60static void free_blocking_lock_record(blocking_lock_record *blr)
61{
62 SAFE_FREE(blr->inbuf);
63 SAFE_FREE(blr);
64}
65
66/****************************************************************************
67 Determine if this is a secondary element of a chained SMB.
68 **************************************************************************/
69
70static bool in_chained_smb(void)
71{
72 return (chain_size != 0);
73}
74
75static void received_unlock_msg(struct messaging_context *msg,
76 void *private_data,
77 uint32_t msg_type,
78 struct server_id server_id,
79 DATA_BLOB *data);
80static void process_blocking_lock_queue(void);
81
82static void brl_timeout_fn(struct event_context *event_ctx,
83 struct timed_event *te,
84 const struct timeval *now,
85 void *private_data)
86{
87 SMB_ASSERT(brl_timeout == te);
88 TALLOC_FREE(brl_timeout);
89
90 change_to_root_user(); /* TODO: Possibly run all timed events as
91 * root */
92
93 process_blocking_lock_queue();
94}
95
96/****************************************************************************
97 After a change to blocking_lock_queue, recalculate the timed_event for the
98 next processing.
99****************************************************************************/
100
101static bool recalc_brl_timeout(void)
102{
103 blocking_lock_record *brl;
104 struct timeval next_timeout;
105
106 TALLOC_FREE(brl_timeout);
107
108 next_timeout = timeval_zero();
109
110 for (brl = blocking_lock_queue; brl; brl = brl->next) {
111 if (timeval_is_zero(&brl->expire_time)) {
112 /*
113 * If we're blocked on pid 0xFFFFFFFF this is
114 * a POSIX lock, so calculate a timeout of
115 * 10 seconds into the future.
116 */
117 if (brl->blocking_pid == 0xFFFFFFFF) {
118 struct timeval psx_to = timeval_current_ofs(10, 0);
119 next_timeout = timeval_min(&next_timeout, &psx_to);
120 }
121
122 continue;
123 }
124
125 if (timeval_is_zero(&next_timeout)) {
126 next_timeout = brl->expire_time;
127 }
128 else {
129 next_timeout = timeval_min(&next_timeout,
130 &brl->expire_time);
131 }
132 }
133
134 if (timeval_is_zero(&next_timeout)) {
135 return True;
136 }
137
138 if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL,
139 next_timeout, "brl_timeout",
140 brl_timeout_fn, NULL))) {
141 return False;
142 }
143
144 return True;
145}
146
147
148/****************************************************************************
149 Function to push a blocking lock request onto the lock queue.
150****************************************************************************/
151
152bool push_blocking_lock_request( struct byte_range_lock *br_lck,
153 const struct smb_request *req,
154 files_struct *fsp,
155 int lock_timeout,
156 int lock_num,
157 uint32 lock_pid,
158 enum brl_type lock_type,
159 enum brl_flavour lock_flav,
160 SMB_BIG_UINT offset,
161 SMB_BIG_UINT count,
162 uint32 blocking_pid)
163{
164 static bool set_lock_msg;
165 size_t length = smb_len(req->inbuf)+4;
166 blocking_lock_record *blr;
167 NTSTATUS status;
168
169 if(in_chained_smb() ) {
170 DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
171 return False;
172 }
173
174 /*
175 * Now queue an entry on the blocking lock queue. We setup
176 * the expiration time here.
177 */
178
179 if((blr = SMB_MALLOC_P(blocking_lock_record)) == NULL) {
180 DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
181 return False;
182 }
183
184 blr->next = NULL;
185 blr->prev = NULL;
186
187 if((blr->inbuf = (char *)SMB_MALLOC(length)) == NULL) {
188 DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
189 SAFE_FREE(blr);
190 return False;
191 }
192
193 blr->com_type = CVAL(req->inbuf,smb_com);
194 blr->fsp = fsp;
195 if (lock_timeout == -1) {
196 blr->expire_time.tv_sec = 0;
197 blr->expire_time.tv_usec = 0; /* Never expire. */
198 } else {
199 blr->expire_time = timeval_current_ofs(lock_timeout/1000,
200 (lock_timeout % 1000) * 1000);
201 }
202 blr->lock_num = lock_num;
203 blr->lock_pid = lock_pid;
204 blr->blocking_pid = blocking_pid;
205 blr->lock_flav = lock_flav;
206 blr->lock_type = lock_type;
207 blr->offset = offset;
208 blr->count = count;
209 memcpy(blr->inbuf, req->inbuf, length);
210 blr->length = length;
211 blr->encrypted = req->encrypted;
212
213 /* Add a pending lock record for this. */
214 status = brl_lock(smbd_messaging_context(), br_lck,
215 lock_pid,
216 procid_self(),
217 offset,
218 count,
219 lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
220 blr->lock_flav,
221 lock_timeout ? True : False, /* blocking_lock. */
222 NULL);
223
224 if (!NT_STATUS_IS_OK(status)) {
225 DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
226 DLIST_REMOVE(blocking_lock_queue, blr);
227 free_blocking_lock_record(blr);
228 return False;
229 }
230
231 DLIST_ADD_END(blocking_lock_queue, blr, blocking_lock_record *);
232 recalc_brl_timeout();
233
234 /* Ensure we'll receive messages when this is unlocked. */
235 if (!set_lock_msg) {
236 messaging_register(smbd_messaging_context(), NULL,
237 MSG_SMB_UNLOCK, received_unlock_msg);
238 set_lock_msg = True;
239 }
240
241 DEBUG(3,("push_blocking_lock_request: lock request length=%u blocked with "
242 "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
243 (unsigned int)length, (unsigned int)blr->expire_time.tv_sec,
244 (unsigned int)blr->expire_time.tv_usec, lock_timeout,
245 blr->fsp->fnum, blr->fsp->fsp_name ));
246
247 /* Push the MID of this packet on the signing queue. */
248 srv_defer_sign_response(SVAL(req->inbuf,smb_mid));
249
250 return True;
251}
252
253/****************************************************************************
254 Return a lockingX success SMB.
255*****************************************************************************/
256
257static void reply_lockingX_success(blocking_lock_record *blr)
258{
259 struct smb_request *req;
260
261 if (!(req = talloc(talloc_tos(), struct smb_request))) {
262 smb_panic("Could not allocate smb_request");
263 }
264
265 init_smb_request(req, (uint8 *)blr->inbuf, 0, blr->encrypted);
266 reply_outbuf(req, 2, 0);
267
268 /*
269 * As this message is a lockingX call we must handle
270 * any following chained message correctly.
271 * This is normally handled in construct_reply(),
272 * but as that calls switch_message, we can't use
273 * that here and must set up the chain info manually.
274 */
275
276 chain_reply(req);
277
278 if (!srv_send_smb(smbd_server_fd(),
279 (char *)req->outbuf,
280 IS_CONN_ENCRYPTED(blr->fsp->conn))) {
281 exit_server_cleanly("send_blocking_reply: srv_send_smb failed.");
282 }
283}
284
285/****************************************************************************
286 Return a generic lock fail error blocking call.
287*****************************************************************************/
288
289static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
290{
291 char outbuf[smb_size];
292 char *inbuf = blr->inbuf;
293
294 construct_reply_common(inbuf, outbuf);
295
296 /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
297 FILE_LOCK_CONFLICT! (tridge) */
298 if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
299 status = NT_STATUS_FILE_LOCK_CONFLICT;
300 }
301
302 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
303 /* Store the last lock error. */
304 files_struct *fsp = blr->fsp;
305
306 if (fsp) {
307 fsp->last_lock_failure.context.smbpid = blr->lock_pid;
308 fsp->last_lock_failure.context.tid = fsp->conn->cnum;
309 fsp->last_lock_failure.context.pid = procid_self();
310 fsp->last_lock_failure.start = blr->offset;
311 fsp->last_lock_failure.size = blr->count;
312 fsp->last_lock_failure.fnum = fsp->fnum;
313 fsp->last_lock_failure.lock_type = READ_LOCK; /* Don't care. */
314 fsp->last_lock_failure.lock_flav = blr->lock_flav;
315 }
316 }
317
318 ERROR_NT(status);
319 if (!srv_send_smb(smbd_server_fd(),outbuf, blr->encrypted)) {
320 exit_server_cleanly("generic_blocking_lock_error: srv_send_smb failed.");
321 }
322}
323
324/****************************************************************************
325 Return a lock fail error for a lockingX call. Undo all the locks we have
326 obtained first.
327*****************************************************************************/
328
329static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
330{
331 char *inbuf = blr->inbuf;
332 files_struct *fsp = blr->fsp;
333 uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
334 SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
335 uint32 lock_pid;
336 unsigned char locktype = CVAL(inbuf,smb_vwv3);
337 bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
338 char *data;
339 int i;
340
341 data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
342
343 /*
344 * Data now points at the beginning of the list
345 * of smb_lkrng structs.
346 */
347
348 /*
349 * Ensure we don't do a remove on the lock that just failed,
350 * as under POSIX rules, if we have a lock already there, we
351 * will delete it (and we shouldn't) .....
352 */
353
354 for(i = blr->lock_num - 1; i >= 0; i--) {
355 bool err;
356
357 lock_pid = get_lock_pid( data, i, large_file_format);
358 count = get_lock_count( data, i, large_file_format);
359 offset = get_lock_offset( data, i, large_file_format, &err);
360
361 /*
362 * We know err cannot be set as if it was the lock
363 * request would never have been queued. JRA.
364 */
365
366 do_unlock(smbd_messaging_context(),
367 fsp,
368 lock_pid,
369 count,
370 offset,
371 WINDOWS_LOCK);
372 }
373
374 generic_blocking_lock_error(blr, status);
375}
376
377/****************************************************************************
378 Return a lock fail error.
379*****************************************************************************/
380
381static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
382{
383 switch(blr->com_type) {
384 case SMBlockingX:
385 reply_lockingX_error(blr, status);
386 break;
387 case SMBtrans2:
388 case SMBtranss2:
389 {
390 char outbuf[smb_size];
391 char *inbuf = blr->inbuf;
392 construct_reply_common(inbuf, outbuf);
393 /* construct_reply_common has done us the favor to pre-fill the
394 * command field with SMBtranss2 which is wrong :-)
395 */
396 SCVAL(outbuf,smb_com,SMBtrans2);
397 ERROR_NT(status);
398 if (!srv_send_smb(smbd_server_fd(),
399 outbuf,
400 IS_CONN_ENCRYPTED(blr->fsp->conn))) {
401 exit_server_cleanly("blocking_lock_reply_error: srv_send_smb failed.");
402 }
403 break;
404 }
405 default:
406 DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
407 exit_server("PANIC - unknown type on blocking lock queue");
408 }
409}
410
411/****************************************************************************
412 Attempt to finish off getting all pending blocking locks for a lockingX call.
413 Returns True if we want to be removed from the list.
414*****************************************************************************/
415
416static bool process_lockingX(blocking_lock_record *blr)
417{
418 char *inbuf = blr->inbuf;
419 unsigned char locktype = CVAL(inbuf,smb_vwv3);
420 files_struct *fsp = blr->fsp;
421 uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
422 uint16 num_locks = SVAL(inbuf,smb_vwv7);
423 SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
424 uint32 lock_pid;
425 bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
426 char *data;
427 NTSTATUS status = NT_STATUS_OK;
428
429 data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
430
431 /*
432 * Data now points at the beginning of the list
433 * of smb_lkrng structs.
434 */
435
436 for(; blr->lock_num < num_locks; blr->lock_num++) {
437 struct byte_range_lock *br_lck = NULL;
438 bool err;
439
440 lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
441 count = get_lock_count( data, blr->lock_num, large_file_format);
442 offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
443
444 /*
445 * We know err cannot be set as if it was the lock
446 * request would never have been queued. JRA.
447 */
448 errno = 0;
449 br_lck = do_lock(smbd_messaging_context(),
450 fsp,
451 lock_pid,
452 count,
453 offset,
454 ((locktype & LOCKING_ANDX_SHARED_LOCK) ?
455 READ_LOCK : WRITE_LOCK),
456 WINDOWS_LOCK,
457 True,
458 &status,
459 &blr->blocking_pid);
460
461 TALLOC_FREE(br_lck);
462
463 if (NT_STATUS_IS_ERR(status)) {
464 break;
465 }
466 }
467
468 if(blr->lock_num == num_locks) {
469 /*
470 * Success - we got all the locks.
471 */
472
473 DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
474 fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
475
476 reply_lockingX_success(blr);
477 return True;
478 } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
479 !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
480 /*
481 * We have other than a "can't get lock"
482 * error. Free any locks we had and return an error.
483 * Return True so we get dequeued.
484 */
485
486 blocking_lock_reply_error(blr, status);
487 return True;
488 }
489
490 /*
491 * Still can't get all the locks - keep waiting.
492 */
493
494 DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
495Waiting....\n",
496 blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
497
498 return False;
499}
500
501/****************************************************************************
502 Attempt to get the posix lock request from a SMBtrans2 call.
503 Returns True if we want to be removed from the list.
504*****************************************************************************/
505
506static bool process_trans2(blocking_lock_record *blr)
507{
508 struct smb_request *req;
509 char params[2];
510 NTSTATUS status;
511 struct byte_range_lock *br_lck = do_lock(smbd_messaging_context(),
512 blr->fsp,
513 blr->lock_pid,
514 blr->count,
515 blr->offset,
516 blr->lock_type,
517 blr->lock_flav,
518 True,
519 &status,
520 &blr->blocking_pid);
521 TALLOC_FREE(br_lck);
522
523 if (!NT_STATUS_IS_OK(status)) {
524 if (ERROR_WAS_LOCK_DENIED(status)) {
525 /* Still can't get the lock, just keep waiting. */
526 return False;
527 }
528 /*
529 * We have other than a "can't get lock"
530 * error. Send an error and return True so we get dequeued.
531 */
532 blocking_lock_reply_error(blr, status);
533 return True;
534 }
535
536 /* We finally got the lock, return success. */
537
538 if (!(req = talloc(talloc_tos(), struct smb_request))) {
539 blocking_lock_reply_error(blr, NT_STATUS_NO_MEMORY);
540 return True;
541 }
542
543 init_smb_request(req, (uint8 *)blr->inbuf, 0, blr->encrypted);
544
545 SCVAL(req->inbuf, smb_com, SMBtrans2);
546 SSVAL(params,0,0);
547 /* Fake up max_data_bytes here - we know it fits. */
548 send_trans2_replies(blr->fsp->conn, req, params, 2, NULL, 0, 0xffff);
549 return True;
550}
551
552
553/****************************************************************************
554 Process a blocking lock SMB.
555 Returns True if we want to be removed from the list.
556*****************************************************************************/
557
558static bool blocking_lock_record_process(blocking_lock_record *blr)
559{
560 switch(blr->com_type) {
561 case SMBlockingX:
562 return process_lockingX(blr);
563 case SMBtrans2:
564 case SMBtranss2:
565 return process_trans2(blr);
566 default:
567 DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
568 exit_server("PANIC - unknown type on blocking lock queue");
569 }
570 return False; /* Keep compiler happy. */
571}
572
573/****************************************************************************
574 Cancel entries by fnum from the blocking lock pending queue.
575*****************************************************************************/
576
577void cancel_pending_lock_requests_by_fid(files_struct *fsp, struct byte_range_lock *br_lck)
578{
579 blocking_lock_record *blr, *next = NULL;
580
581 for(blr = blocking_lock_queue; blr; blr = next) {
582 next = blr->next;
583 if(blr->fsp->fnum == fsp->fnum) {
584 unsigned char locktype = 0;
585
586 if (blr->com_type == SMBlockingX) {
587 locktype = CVAL(blr->inbuf,smb_vwv3);
588 }
589
590 if (br_lck) {
591 DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
592file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
593
594 brl_lock_cancel(br_lck,
595 blr->lock_pid,
596 procid_self(),
597 blr->offset,
598 blr->count,
599 blr->lock_flav);
600
601 blocking_lock_cancel(fsp,
602 blr->lock_pid,
603 blr->offset,
604 blr->count,
605 blr->lock_flav,
606 locktype,
607 NT_STATUS_RANGE_NOT_LOCKED);
608 }
609 /* We're closing the file fsp here, so ensure
610 * we don't have a dangling pointer. */
611 blr->fsp = NULL;
612 }
613 }
614}
615
616/****************************************************************************
617 Delete entries by mid from the blocking lock pending queue. Always send reply.
618*****************************************************************************/
619
620void remove_pending_lock_requests_by_mid(int mid)
621{
622 blocking_lock_record *blr, *next = NULL;
623
624 for(blr = blocking_lock_queue; blr; blr = next) {
625 next = blr->next;
626 if(SVAL(blr->inbuf,smb_mid) == mid) {
627 files_struct *fsp = blr->fsp;
628 struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
629
630 if (br_lck) {
631 DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
632file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
633
634 brl_lock_cancel(br_lck,
635 blr->lock_pid,
636 procid_self(),
637 blr->offset,
638 blr->count,
639 blr->lock_flav);
640 TALLOC_FREE(br_lck);
641 }
642
643 blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
644 DLIST_REMOVE(blocking_lock_queue, blr);
645 free_blocking_lock_record(blr);
646 }
647 }
648}
649
650/****************************************************************************
651 Is this mid a blocking lock request on the queue ?
652*****************************************************************************/
653
654bool blocking_lock_was_deferred(int mid)
655{
656 blocking_lock_record *blr, *next = NULL;
657
658 for(blr = blocking_lock_queue; blr; blr = next) {
659 next = blr->next;
660 if(SVAL(blr->inbuf,smb_mid) == mid) {
661 return True;
662 }
663 }
664 return False;
665}
666
667/****************************************************************************
668 Set a flag as an unlock request affects one of our pending locks.
669*****************************************************************************/
670
671static void received_unlock_msg(struct messaging_context *msg,
672 void *private_data,
673 uint32_t msg_type,
674 struct server_id server_id,
675 DATA_BLOB *data)
676{
677 DEBUG(10,("received_unlock_msg\n"));
678 process_blocking_lock_queue();
679}
680
681/****************************************************************************
682 Process the blocking lock queue. Note that this is only called as root.
683*****************************************************************************/
684
685static void process_blocking_lock_queue(void)
686{
687 struct timeval tv_curr = timeval_current();
688 blocking_lock_record *blr, *next = NULL;
689 bool recalc_timeout = False;
690
691 /*
692 * Go through the queue and see if we can get any of the locks.
693 */
694
695 for (blr = blocking_lock_queue; blr; blr = next) {
696 connection_struct *conn = NULL;
697 uint16 vuid;
698 files_struct *fsp = NULL;
699
700 next = blr->next;
701
702 /*
703 * Ensure we don't have any old chain_fsp values
704 * sitting around....
705 */
706 chain_size = 0;
707 file_chain_reset();
708 fsp = blr->fsp;
709
710 conn = conn_find(SVAL(blr->inbuf,smb_tid));
711 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
712 SVAL(blr->inbuf,smb_uid);
713
714 DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
715 fsp->fnum, fsp->fsp_name ));
716
717 if(!change_to_user(conn,vuid)) {
718 struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
719
720 /*
721 * Remove the entry and return an error to the client.
722 */
723
724 if (br_lck) {
725 brl_lock_cancel(br_lck,
726 blr->lock_pid,
727 procid_self(),
728 blr->offset,
729 blr->count,
730 blr->lock_flav);
731 TALLOC_FREE(br_lck);
732 }
733
734 DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
735 vuid ));
736 blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
737 DLIST_REMOVE(blocking_lock_queue, blr);
738 free_blocking_lock_record(blr);
739 recalc_timeout = True;
740 continue;
741 }
742
743 if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
744 struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
745
746 /*
747 * Remove the entry and return an error to the client.
748 */
749
750 if (br_lck) {
751 brl_lock_cancel(br_lck,
752 blr->lock_pid,
753 procid_self(),
754 blr->offset,
755 blr->count,
756 blr->lock_flav);
757 TALLOC_FREE(br_lck);
758 }
759
760 DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
761 blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
762 DLIST_REMOVE(blocking_lock_queue, blr);
763 free_blocking_lock_record(blr);
764 recalc_timeout = True;
765 change_to_root_user();
766 continue;
767 }
768
769 /*
770 * Go through the remaining locks and try and obtain them.
771 * The call returns True if all locks were obtained successfully
772 * and False if we still need to wait.
773 */
774
775 if(blocking_lock_record_process(blr)) {
776 struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
777
778 if (br_lck) {
779 brl_lock_cancel(br_lck,
780 blr->lock_pid,
781 procid_self(),
782 blr->offset,
783 blr->count,
784 blr->lock_flav);
785 TALLOC_FREE(br_lck);
786 }
787
788 DLIST_REMOVE(blocking_lock_queue, blr);
789 free_blocking_lock_record(blr);
790 recalc_timeout = True;
791 change_to_root_user();
792 continue;
793 }
794
795 change_to_root_user();
796
797 /*
798 * We couldn't get the locks for this record on the list.
799 * If the time has expired, return a lock error.
800 */
801
802 if (!timeval_is_zero(&blr->expire_time) && timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
803 struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
804
805 /*
806 * Lock expired - throw away all previously
807 * obtained locks and return lock error.
808 */
809
810 if (br_lck) {
811 DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
812 fsp->fnum, fsp->fsp_name ));
813
814 brl_lock_cancel(br_lck,
815 blr->lock_pid,
816 procid_self(),
817 blr->offset,
818 blr->count,
819 blr->lock_flav);
820 TALLOC_FREE(br_lck);
821 }
822
823 blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
824 DLIST_REMOVE(blocking_lock_queue, blr);
825 free_blocking_lock_record(blr);
826 recalc_timeout = True;
827 }
828 }
829
830 if (recalc_timeout) {
831 recalc_brl_timeout();
832 }
833}
834
835/****************************************************************************
836 Handle a cancel message. Lock already moved onto the cancel queue.
837*****************************************************************************/
838
839#define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(blocking_lock_record *) + sizeof(NTSTATUS))
840
841static void process_blocking_lock_cancel_message(struct messaging_context *ctx,
842 void *private_data,
843 uint32_t msg_type,
844 struct server_id server_id,
845 DATA_BLOB *data)
846{
847 NTSTATUS err;
848 const char *msg = (const char *)data->data;
849 blocking_lock_record *blr;
850
851 if (data->data == NULL) {
852 smb_panic("process_blocking_lock_cancel_message: null msg");
853 }
854
855 if (data->length != MSG_BLOCKING_LOCK_CANCEL_SIZE) {
856 DEBUG(0, ("process_blocking_lock_cancel_message: "
857 "Got invalid msg len %d\n", (int)data->length));
858 smb_panic("process_blocking_lock_cancel_message: bad msg");
859 }
860
861 memcpy(&blr, msg, sizeof(blr));
862 memcpy(&err, &msg[sizeof(blr)], sizeof(NTSTATUS));
863
864 DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
865 nt_errstr(err) ));
866
867 blocking_lock_reply_error(blr, err);
868 DLIST_REMOVE(blocking_lock_cancelled_queue, blr);
869 free_blocking_lock_record(blr);
870}
871
872/****************************************************************************
873 Send ourselves a blocking lock cancelled message. Handled asynchronously above.
874*****************************************************************************/
875
876bool blocking_lock_cancel(files_struct *fsp,
877 uint32 lock_pid,
878 SMB_BIG_UINT offset,
879 SMB_BIG_UINT count,
880 enum brl_flavour lock_flav,
881 unsigned char locktype,
882 NTSTATUS err)
883{
884 static bool initialized;
885 char msg[MSG_BLOCKING_LOCK_CANCEL_SIZE];
886 blocking_lock_record *blr;
887
888 if (!initialized) {
889 /* Register our message. */
890 messaging_register(smbd_messaging_context(), NULL,
891 MSG_SMB_BLOCKING_LOCK_CANCEL,
892 process_blocking_lock_cancel_message);
893
894 initialized = True;
895 }
896
897 for (blr = blocking_lock_queue; blr; blr = blr->next) {
898 if (fsp == blr->fsp &&
899 lock_pid == blr->lock_pid &&
900 offset == blr->offset &&
901 count == blr->count &&
902 lock_flav == blr->lock_flav) {
903 break;
904 }
905 }
906
907 if (!blr) {
908 return False;
909 }
910
911 /* Check the flags are right. */
912 if (blr->com_type == SMBlockingX &&
913 (locktype & LOCKING_ANDX_LARGE_FILES) !=
914 (CVAL(blr->inbuf,smb_vwv3) & LOCKING_ANDX_LARGE_FILES)) {
915 return False;
916 }
917
918 /* Move to cancelled queue. */
919 DLIST_REMOVE(blocking_lock_queue, blr);
920 DLIST_ADD(blocking_lock_cancelled_queue, blr);
921
922 /* Create the message. */
923 memcpy(msg, &blr, sizeof(blr));
924 memcpy(&msg[sizeof(blr)], &err, sizeof(NTSTATUS));
925
926 messaging_send_buf(smbd_messaging_context(), procid_self(),
927 MSG_SMB_BLOCKING_LOCK_CANCEL,
928 (uint8 *)&msg, sizeof(msg));
929
930 return True;
931}
Note: See TracBrowser for help on using the repository browser.