2 Unix SMB/CIFS implementation.
3 Blocking Locking functions
4 Copyright (C) Jeremy Allison 1998-2003
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.
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.
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/>.
22 #define DBGC_CLASS DBGC_LOCKING
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 *****************************************************************************/
29 typedef struct _blocking_lock_record
{
30 struct _blocking_lock_record
*next
;
31 struct _blocking_lock_record
*prev
;
34 struct timeval expire_time
;
39 uint32 blocking_pid
; /* PID that blocks us. */
40 enum brl_flavour lock_flav
;
41 enum brl_type lock_type
;
45 } blocking_lock_record
;
47 /* dlink list we store pending lock records on. */
48 static blocking_lock_record
*blocking_lock_queue
;
50 /* dlink list we move cancelled lock records onto. */
51 static blocking_lock_record
*blocking_lock_cancelled_queue
;
53 /* The event that makes us process our blocking lock queue */
54 static struct timed_event
*brl_timeout
;
56 /****************************************************************************
57 Destructor for the above structure.
58 ****************************************************************************/
60 static void free_blocking_lock_record(blocking_lock_record
*blr
)
62 SAFE_FREE(blr
->inbuf
);
66 /****************************************************************************
67 Determine if this is a secondary element of a chained SMB.
68 **************************************************************************/
70 static bool in_chained_smb(void)
72 return (chain_size
!= 0);
75 static void received_unlock_msg(struct messaging_context
*msg
,
78 struct server_id server_id
,
80 static void process_blocking_lock_queue(void);
82 static void brl_timeout_fn(struct event_context
*event_ctx
,
83 struct timed_event
*te
,
87 SMB_ASSERT(brl_timeout
== te
);
88 TALLOC_FREE(brl_timeout
);
90 change_to_root_user(); /* TODO: Possibly run all timed events as
93 process_blocking_lock_queue();
96 /****************************************************************************
97 We need a version of timeval_min that treats zero timval as infinite.
98 ****************************************************************************/
100 static struct timeval
timeval_brl_min(const struct timeval
*tv1
,
101 const struct timeval
*tv2
)
103 if (timeval_is_zero(tv1
)) {
106 if (timeval_is_zero(tv2
)) {
109 return timeval_min(tv1
, tv2
);
112 /****************************************************************************
113 After a change to blocking_lock_queue, recalculate the timed_event for the
115 ****************************************************************************/
117 static bool recalc_brl_timeout(void)
119 blocking_lock_record
*brl
;
120 struct timeval next_timeout
;
122 TALLOC_FREE(brl_timeout
);
124 next_timeout
= timeval_zero();
126 for (brl
= blocking_lock_queue
; brl
; brl
= brl
->next
) {
127 if (timeval_is_zero(&brl
->expire_time
)) {
129 * If we're blocked on pid 0xFFFFFFFF this is
130 * a POSIX lock, so calculate a timeout of
131 * 10 seconds into the future.
133 if (brl
->blocking_pid
== 0xFFFFFFFF) {
134 struct timeval psx_to
= timeval_current_ofs(10, 0);
135 next_timeout
= timeval_brl_min(&next_timeout
, &psx_to
);
141 next_timeout
= timeval_brl_min(&next_timeout
, &brl
->expire_time
);
144 if (timeval_is_zero(&next_timeout
)) {
148 if (!(brl_timeout
= event_add_timed(smbd_event_context(), NULL
,
150 brl_timeout_fn
, NULL
))) {
158 /****************************************************************************
159 Function to push a blocking lock request onto the lock queue.
160 ****************************************************************************/
162 bool push_blocking_lock_request( struct byte_range_lock
*br_lck
,
163 const struct smb_request
*req
,
168 enum brl_type lock_type
,
169 enum brl_flavour lock_flav
,
174 static bool set_lock_msg
;
175 size_t length
= smb_len(req
->inbuf
)+4;
176 blocking_lock_record
*blr
;
179 if(in_chained_smb() ) {
180 DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
185 * Now queue an entry on the blocking lock queue. We setup
186 * the expiration time here.
189 if((blr
= SMB_MALLOC_P(blocking_lock_record
)) == NULL
) {
190 DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
197 if((blr
->inbuf
= (char *)SMB_MALLOC(length
)) == NULL
) {
198 DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
203 blr
->com_type
= CVAL(req
->inbuf
,smb_com
);
205 if (lock_timeout
== -1) {
206 blr
->expire_time
.tv_sec
= 0;
207 blr
->expire_time
.tv_usec
= 0; /* Never expire. */
209 blr
->expire_time
= timeval_current_ofs(lock_timeout
/1000,
210 (lock_timeout
% 1000) * 1000);
212 blr
->lock_num
= lock_num
;
213 blr
->lock_pid
= lock_pid
;
214 blr
->blocking_pid
= blocking_pid
;
215 blr
->lock_flav
= lock_flav
;
216 blr
->lock_type
= lock_type
;
217 blr
->offset
= offset
;
219 memcpy(blr
->inbuf
, req
->inbuf
, length
);
220 blr
->length
= length
;
221 blr
->encrypted
= req
->encrypted
;
223 /* Add a pending lock record for this. */
224 status
= brl_lock(smbd_messaging_context(), br_lck
,
229 lock_type
== READ_LOCK
? PENDING_READ_LOCK
: PENDING_WRITE_LOCK
,
231 lock_timeout
? True
: False
, /* blocking_lock. */
234 if (!NT_STATUS_IS_OK(status
)) {
235 DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
236 DLIST_REMOVE(blocking_lock_queue
, blr
);
237 free_blocking_lock_record(blr
);
241 DLIST_ADD_END(blocking_lock_queue
, blr
, blocking_lock_record
*);
242 recalc_brl_timeout();
244 /* Ensure we'll receive messages when this is unlocked. */
246 messaging_register(smbd_messaging_context(), NULL
,
247 MSG_SMB_UNLOCK
, received_unlock_msg
);
251 DEBUG(3,("push_blocking_lock_request: lock request length=%u blocked with "
252 "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
253 (unsigned int)length
, (unsigned int)blr
->expire_time
.tv_sec
,
254 (unsigned int)blr
->expire_time
.tv_usec
, lock_timeout
,
255 blr
->fsp
->fnum
, blr
->fsp
->fsp_name
));
257 /* Push the MID of this packet on the signing queue. */
258 srv_defer_sign_response(SVAL(req
->inbuf
,smb_mid
));
263 /****************************************************************************
264 Return a lockingX success SMB.
265 *****************************************************************************/
267 static void reply_lockingX_success(blocking_lock_record
*blr
)
269 struct smb_request
*req
;
271 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
272 smb_panic("Could not allocate smb_request");
275 init_smb_request(req
, (uint8
*)blr
->inbuf
, 0, blr
->encrypted
);
276 reply_outbuf(req
, 2, 0);
279 * As this message is a lockingX call we must handle
280 * any following chained message correctly.
281 * This is normally handled in construct_reply(),
282 * but as that calls switch_message, we can't use
283 * that here and must set up the chain info manually.
288 if (!srv_send_smb(smbd_server_fd(),
290 IS_CONN_ENCRYPTED(blr
->fsp
->conn
))) {
291 exit_server_cleanly("send_blocking_reply: srv_send_smb failed.");
295 /****************************************************************************
296 Return a generic lock fail error blocking call.
297 *****************************************************************************/
299 static void generic_blocking_lock_error(blocking_lock_record
*blr
, NTSTATUS status
)
301 char outbuf
[smb_size
];
302 char *inbuf
= blr
->inbuf
;
304 construct_reply_common(inbuf
, outbuf
);
306 /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
307 FILE_LOCK_CONFLICT! (tridge) */
308 if (NT_STATUS_EQUAL(status
, NT_STATUS_LOCK_NOT_GRANTED
)) {
309 status
= NT_STATUS_FILE_LOCK_CONFLICT
;
312 if (NT_STATUS_EQUAL(status
, NT_STATUS_FILE_LOCK_CONFLICT
)) {
313 /* Store the last lock error. */
314 files_struct
*fsp
= blr
->fsp
;
317 fsp
->last_lock_failure
.context
.smbpid
= blr
->lock_pid
;
318 fsp
->last_lock_failure
.context
.tid
= fsp
->conn
->cnum
;
319 fsp
->last_lock_failure
.context
.pid
= procid_self();
320 fsp
->last_lock_failure
.start
= blr
->offset
;
321 fsp
->last_lock_failure
.size
= blr
->count
;
322 fsp
->last_lock_failure
.fnum
= fsp
->fnum
;
323 fsp
->last_lock_failure
.lock_type
= READ_LOCK
; /* Don't care. */
324 fsp
->last_lock_failure
.lock_flav
= blr
->lock_flav
;
329 if (!srv_send_smb(smbd_server_fd(),outbuf
, blr
->encrypted
)) {
330 exit_server_cleanly("generic_blocking_lock_error: srv_send_smb failed.");
334 /****************************************************************************
335 Return a lock fail error for a lockingX call. Undo all the locks we have
337 *****************************************************************************/
339 static void reply_lockingX_error(blocking_lock_record
*blr
, NTSTATUS status
)
341 char *inbuf
= blr
->inbuf
;
342 files_struct
*fsp
= blr
->fsp
;
343 uint16 num_ulocks
= SVAL(inbuf
,smb_vwv6
);
344 SMB_BIG_UINT count
= (SMB_BIG_UINT
)0, offset
= (SMB_BIG_UINT
) 0;
346 unsigned char locktype
= CVAL(inbuf
,smb_vwv3
);
347 bool large_file_format
= (locktype
& LOCKING_ANDX_LARGE_FILES
);
351 data
= smb_buf(inbuf
) + ((large_file_format
? 20 : 10)*num_ulocks
);
354 * Data now points at the beginning of the list
355 * of smb_lkrng structs.
359 * Ensure we don't do a remove on the lock that just failed,
360 * as under POSIX rules, if we have a lock already there, we
361 * will delete it (and we shouldn't) .....
364 for(i
= blr
->lock_num
- 1; i
>= 0; i
--) {
367 lock_pid
= get_lock_pid( data
, i
, large_file_format
);
368 count
= get_lock_count( data
, i
, large_file_format
);
369 offset
= get_lock_offset( data
, i
, large_file_format
, &err
);
372 * We know err cannot be set as if it was the lock
373 * request would never have been queued. JRA.
376 do_unlock(smbd_messaging_context(),
384 generic_blocking_lock_error(blr
, status
);
387 /****************************************************************************
388 Return a lock fail error.
389 *****************************************************************************/
391 static void blocking_lock_reply_error(blocking_lock_record
*blr
, NTSTATUS status
)
393 switch(blr
->com_type
) {
395 reply_lockingX_error(blr
, status
);
400 char outbuf
[smb_size
];
401 char *inbuf
= blr
->inbuf
;
402 construct_reply_common(inbuf
, outbuf
);
403 /* construct_reply_common has done us the favor to pre-fill the
404 * command field with SMBtranss2 which is wrong :-)
406 SCVAL(outbuf
,smb_com
,SMBtrans2
);
408 if (!srv_send_smb(smbd_server_fd(),
410 IS_CONN_ENCRYPTED(blr
->fsp
->conn
))) {
411 exit_server_cleanly("blocking_lock_reply_error: srv_send_smb failed.");
416 DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
417 exit_server("PANIC - unknown type on blocking lock queue");
421 /****************************************************************************
422 Attempt to finish off getting all pending blocking locks for a lockingX call.
423 Returns True if we want to be removed from the list.
424 *****************************************************************************/
426 static bool process_lockingX(blocking_lock_record
*blr
)
428 char *inbuf
= blr
->inbuf
;
429 unsigned char locktype
= CVAL(inbuf
,smb_vwv3
);
430 files_struct
*fsp
= blr
->fsp
;
431 uint16 num_ulocks
= SVAL(inbuf
,smb_vwv6
);
432 uint16 num_locks
= SVAL(inbuf
,smb_vwv7
);
433 SMB_BIG_UINT count
= (SMB_BIG_UINT
)0, offset
= (SMB_BIG_UINT
)0;
435 bool large_file_format
= (locktype
& LOCKING_ANDX_LARGE_FILES
);
437 NTSTATUS status
= NT_STATUS_OK
;
439 data
= smb_buf(inbuf
) + ((large_file_format
? 20 : 10)*num_ulocks
);
442 * Data now points at the beginning of the list
443 * of smb_lkrng structs.
446 for(; blr
->lock_num
< num_locks
; blr
->lock_num
++) {
447 struct byte_range_lock
*br_lck
= NULL
;
450 lock_pid
= get_lock_pid( data
, blr
->lock_num
, large_file_format
);
451 count
= get_lock_count( data
, blr
->lock_num
, large_file_format
);
452 offset
= get_lock_offset( data
, blr
->lock_num
, large_file_format
, &err
);
455 * We know err cannot be set as if it was the lock
456 * request would never have been queued. JRA.
459 br_lck
= do_lock(smbd_messaging_context(),
464 ((locktype
& LOCKING_ANDX_SHARED_LOCK
) ?
465 READ_LOCK
: WRITE_LOCK
),
473 if (NT_STATUS_IS_ERR(status
)) {
478 if(blr
->lock_num
== num_locks
) {
480 * Success - we got all the locks.
483 DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
484 fsp
->fsp_name
, fsp
->fnum
, (unsigned int)locktype
, num_locks
) );
486 reply_lockingX_success(blr
);
488 } else if (!NT_STATUS_EQUAL(status
,NT_STATUS_LOCK_NOT_GRANTED
) &&
489 !NT_STATUS_EQUAL(status
,NT_STATUS_FILE_LOCK_CONFLICT
)) {
491 * We have other than a "can't get lock"
492 * error. Free any locks we had and return an error.
493 * Return True so we get dequeued.
496 blocking_lock_reply_error(blr
, status
);
501 * Still can't get all the locks - keep waiting.
504 DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
506 blr
->lock_num
, num_locks
, fsp
->fsp_name
, fsp
->fnum
));
511 /****************************************************************************
512 Attempt to get the posix lock request from a SMBtrans2 call.
513 Returns True if we want to be removed from the list.
514 *****************************************************************************/
516 static bool process_trans2(blocking_lock_record
*blr
)
518 struct smb_request
*req
;
521 struct byte_range_lock
*br_lck
= do_lock(smbd_messaging_context(),
533 if (!NT_STATUS_IS_OK(status
)) {
534 if (ERROR_WAS_LOCK_DENIED(status
)) {
535 /* Still can't get the lock, just keep waiting. */
539 * We have other than a "can't get lock"
540 * error. Send an error and return True so we get dequeued.
542 blocking_lock_reply_error(blr
, status
);
546 /* We finally got the lock, return success. */
548 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
549 blocking_lock_reply_error(blr
, NT_STATUS_NO_MEMORY
);
553 init_smb_request(req
, (uint8
*)blr
->inbuf
, 0, blr
->encrypted
);
555 SCVAL(req
->inbuf
, smb_com
, SMBtrans2
);
557 /* Fake up max_data_bytes here - we know it fits. */
558 send_trans2_replies(blr
->fsp
->conn
, req
, params
, 2, NULL
, 0, 0xffff);
563 /****************************************************************************
564 Process a blocking lock SMB.
565 Returns True if we want to be removed from the list.
566 *****************************************************************************/
568 static bool blocking_lock_record_process(blocking_lock_record
*blr
)
570 switch(blr
->com_type
) {
572 return process_lockingX(blr
);
575 return process_trans2(blr
);
577 DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
578 exit_server("PANIC - unknown type on blocking lock queue");
580 return False
; /* Keep compiler happy. */
583 /****************************************************************************
584 Cancel entries by fnum from the blocking lock pending queue.
585 *****************************************************************************/
587 void cancel_pending_lock_requests_by_fid(files_struct
*fsp
, struct byte_range_lock
*br_lck
)
589 blocking_lock_record
*blr
, *next
= NULL
;
591 for(blr
= blocking_lock_queue
; blr
; blr
= next
) {
593 if(blr
->fsp
->fnum
== fsp
->fnum
) {
594 unsigned char locktype
= 0;
596 if (blr
->com_type
== SMBlockingX
) {
597 locktype
= CVAL(blr
->inbuf
,smb_vwv3
);
601 DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
602 file %s fnum = %d\n", blr
->com_type
, fsp
->fsp_name
, fsp
->fnum
));
604 brl_lock_cancel(br_lck
,
611 blocking_lock_cancel(fsp
,
617 NT_STATUS_RANGE_NOT_LOCKED
);
619 /* We're closing the file fsp here, so ensure
620 * we don't have a dangling pointer. */
626 /****************************************************************************
627 Delete entries by mid from the blocking lock pending queue. Always send reply.
628 *****************************************************************************/
630 void remove_pending_lock_requests_by_mid(int mid
)
632 blocking_lock_record
*blr
, *next
= NULL
;
634 for(blr
= blocking_lock_queue
; blr
; blr
= next
) {
636 if(SVAL(blr
->inbuf
,smb_mid
) == mid
) {
637 files_struct
*fsp
= blr
->fsp
;
638 struct byte_range_lock
*br_lck
= brl_get_locks(talloc_tos(), fsp
);
641 DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
642 file %s fnum = %d\n", blr
->com_type
, fsp
->fsp_name
, fsp
->fnum
));
644 brl_lock_cancel(br_lck
,
653 blocking_lock_reply_error(blr
,NT_STATUS_FILE_LOCK_CONFLICT
);
654 DLIST_REMOVE(blocking_lock_queue
, blr
);
655 free_blocking_lock_record(blr
);
660 /****************************************************************************
661 Is this mid a blocking lock request on the queue ?
662 *****************************************************************************/
664 bool blocking_lock_was_deferred(int mid
)
666 blocking_lock_record
*blr
, *next
= NULL
;
668 for(blr
= blocking_lock_queue
; blr
; blr
= next
) {
670 if(SVAL(blr
->inbuf
,smb_mid
) == mid
) {
677 /****************************************************************************
678 Set a flag as an unlock request affects one of our pending locks.
679 *****************************************************************************/
681 static void received_unlock_msg(struct messaging_context
*msg
,
684 struct server_id server_id
,
687 DEBUG(10,("received_unlock_msg\n"));
688 process_blocking_lock_queue();
691 /****************************************************************************
692 Process the blocking lock queue. Note that this is only called as root.
693 *****************************************************************************/
695 static void process_blocking_lock_queue(void)
697 struct timeval tv_curr
= timeval_current();
698 blocking_lock_record
*blr
, *next
= NULL
;
701 * Go through the queue and see if we can get any of the locks.
704 for (blr
= blocking_lock_queue
; blr
; blr
= next
) {
705 connection_struct
*conn
= NULL
;
707 files_struct
*fsp
= NULL
;
712 * Ensure we don't have any old chain_fsp values
719 conn
= conn_find(SVAL(blr
->inbuf
,smb_tid
));
720 vuid
= (lp_security() == SEC_SHARE
) ? UID_FIELD_INVALID
:
721 SVAL(blr
->inbuf
,smb_uid
);
723 DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
724 fsp
->fnum
, fsp
->fsp_name
));
726 if(!change_to_user(conn
,vuid
)) {
727 struct byte_range_lock
*br_lck
= brl_get_locks(talloc_tos(), fsp
);
730 * Remove the entry and return an error to the client.
734 brl_lock_cancel(br_lck
,
743 DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
745 blocking_lock_reply_error(blr
,NT_STATUS_ACCESS_DENIED
);
746 DLIST_REMOVE(blocking_lock_queue
, blr
);
747 free_blocking_lock_record(blr
);
751 if(!set_current_service(conn
,SVAL(blr
->inbuf
,smb_flg
),True
)) {
752 struct byte_range_lock
*br_lck
= brl_get_locks(talloc_tos(), fsp
);
755 * Remove the entry and return an error to the client.
759 brl_lock_cancel(br_lck
,
768 DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno
) ));
769 blocking_lock_reply_error(blr
,NT_STATUS_ACCESS_DENIED
);
770 DLIST_REMOVE(blocking_lock_queue
, blr
);
771 free_blocking_lock_record(blr
);
772 change_to_root_user();
777 * Go through the remaining locks and try and obtain them.
778 * The call returns True if all locks were obtained successfully
779 * and False if we still need to wait.
782 if(blocking_lock_record_process(blr
)) {
783 struct byte_range_lock
*br_lck
= brl_get_locks(talloc_tos(), fsp
);
786 brl_lock_cancel(br_lck
,
795 DLIST_REMOVE(blocking_lock_queue
, blr
);
796 free_blocking_lock_record(blr
);
797 change_to_root_user();
801 change_to_root_user();
804 * We couldn't get the locks for this record on the list.
805 * If the time has expired, return a lock error.
808 if (!timeval_is_zero(&blr
->expire_time
) && timeval_compare(&blr
->expire_time
, &tv_curr
) <= 0) {
809 struct byte_range_lock
*br_lck
= brl_get_locks(talloc_tos(), fsp
);
812 * Lock expired - throw away all previously
813 * obtained locks and return lock error.
817 DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
818 fsp
->fnum
, fsp
->fsp_name
));
820 brl_lock_cancel(br_lck
,
829 blocking_lock_reply_error(blr
,NT_STATUS_FILE_LOCK_CONFLICT
);
830 DLIST_REMOVE(blocking_lock_queue
, blr
);
831 free_blocking_lock_record(blr
);
835 recalc_brl_timeout();
838 /****************************************************************************
839 Handle a cancel message. Lock already moved onto the cancel queue.
840 *****************************************************************************/
842 #define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(blocking_lock_record *) + sizeof(NTSTATUS))
844 static void process_blocking_lock_cancel_message(struct messaging_context
*ctx
,
847 struct server_id server_id
,
851 const char *msg
= (const char *)data
->data
;
852 blocking_lock_record
*blr
;
854 if (data
->data
== NULL
) {
855 smb_panic("process_blocking_lock_cancel_message: null msg");
858 if (data
->length
!= MSG_BLOCKING_LOCK_CANCEL_SIZE
) {
859 DEBUG(0, ("process_blocking_lock_cancel_message: "
860 "Got invalid msg len %d\n", (int)data
->length
));
861 smb_panic("process_blocking_lock_cancel_message: bad msg");
864 memcpy(&blr
, msg
, sizeof(blr
));
865 memcpy(&err
, &msg
[sizeof(blr
)], sizeof(NTSTATUS
));
867 DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
870 blocking_lock_reply_error(blr
, err
);
871 DLIST_REMOVE(blocking_lock_cancelled_queue
, blr
);
872 free_blocking_lock_record(blr
);
875 /****************************************************************************
876 Send ourselves a blocking lock cancelled message. Handled asynchronously above.
877 *****************************************************************************/
879 bool blocking_lock_cancel(files_struct
*fsp
,
883 enum brl_flavour lock_flav
,
884 unsigned char locktype
,
887 static bool initialized
;
888 char msg
[MSG_BLOCKING_LOCK_CANCEL_SIZE
];
889 blocking_lock_record
*blr
;
892 /* Register our message. */
893 messaging_register(smbd_messaging_context(), NULL
,
894 MSG_SMB_BLOCKING_LOCK_CANCEL
,
895 process_blocking_lock_cancel_message
);
900 for (blr
= blocking_lock_queue
; blr
; blr
= blr
->next
) {
901 if (fsp
== blr
->fsp
&&
902 lock_pid
== blr
->lock_pid
&&
903 offset
== blr
->offset
&&
904 count
== blr
->count
&&
905 lock_flav
== blr
->lock_flav
) {
914 /* Check the flags are right. */
915 if (blr
->com_type
== SMBlockingX
&&
916 (locktype
& LOCKING_ANDX_LARGE_FILES
) !=
917 (CVAL(blr
->inbuf
,smb_vwv3
) & LOCKING_ANDX_LARGE_FILES
)) {
921 /* Move to cancelled queue. */
922 DLIST_REMOVE(blocking_lock_queue
, blr
);
923 DLIST_ADD(blocking_lock_cancelled_queue
, blr
);
925 /* Create the message. */
926 memcpy(msg
, &blr
, sizeof(blr
));
927 memcpy(&msg
[sizeof(blr
)], &err
, sizeof(NTSTATUS
));
929 messaging_send_buf(smbd_messaging_context(), procid_self(),
930 MSG_SMB_BLOCKING_LOCK_CANCEL
,
931 (uint8
*)&msg
, sizeof(msg
));