2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998 - 2001
6 Copyright (C) Volker Lendecke 2005
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.
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.
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/>.
22 #define DBGC_CLASS DBGC_LOCKING
25 /* Current number of oplocks we have outstanding. */
26 static int32 exclusive_oplocks_open
= 0;
27 static int32 level_II_oplocks_open
= 0;
28 bool global_client_failed_oplock_break
= False
;
30 extern uint32 global_client_caps
;
32 static struct kernel_oplocks
*koplocks
;
34 /****************************************************************************
35 Get the number of current exclusive oplocks.
36 ****************************************************************************/
38 int32
get_number_of_exclusive_open_oplocks(void)
40 return exclusive_oplocks_open
;
43 /****************************************************************************
44 Return True if an oplock message is pending.
45 ****************************************************************************/
47 bool oplock_message_waiting(fd_set
*fds
)
49 if (koplocks
&& koplocks
->msg_waiting(fds
)) {
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 ****************************************************************************/
63 void process_kernel_oplocks(struct messaging_context
*msg_ctx
, fd_set
*pfds
)
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.
75 while (koplocks
->msg_waiting(pfds
)) {
77 char msg
[MSG_SMB_KERNEL_BREAK_SIZE
];
79 fsp
= koplocks
->receive_message(pfds
);
82 DEBUG(3, ("Kernel oplock message announced, but none "
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
);
91 /* Don't need to be root here as we're only ever
92 sending to ourselves. */
94 messaging_send_buf(msg_ctx
, procid_self(),
96 (uint8
*)&msg
, MSG_SMB_KERNEL_BREAK_SIZE
);
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 ****************************************************************************/
105 bool set_file_oplock(files_struct
*fsp
, int oplock_type
)
107 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
108 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
110 !koplocks
->set_oplock(fsp
, oplock_type
)) {
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
++;
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
));
131 /****************************************************************************
132 Attempt to release an oplock on a file. Decrements oplock count.
133 ****************************************************************************/
135 void release_file_oplock(files_struct
*fsp
)
137 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
138 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
140 koplocks
->release_oplock(fsp
);
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
--;
149 SMB_ASSERT(exclusive_oplocks_open
>=0);
150 SMB_ASSERT(level_II_oplocks_open
>=0);
152 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
153 /* This doesn't matter for close. */
154 fsp
->oplock_type
= FAKE_LEVEL_II_OPLOCK
;
156 fsp
->oplock_type
= NO_OPLOCK
;
158 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
160 flush_write_cache(fsp
, OPLOCK_RELEASE_FLUSH
);
162 TALLOC_FREE(fsp
->oplock_timeout
);
165 /****************************************************************************
166 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
167 ****************************************************************************/
169 static void downgrade_file_oplock(files_struct
*fsp
)
172 koplocks
->release_oplock(fsp
);
174 fsp
->oplock_type
= LEVEL_II_OPLOCK
;
175 exclusive_oplocks_open
--;
176 level_II_oplocks_open
++;
177 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
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 ****************************************************************************/
186 bool remove_oplock(files_struct
*fsp
)
189 struct share_mode_lock
*lck
;
191 /* Remove the oplock flag from the sharemode. */
192 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
195 DEBUG(0,("remove_oplock: failed to lock share entry for "
196 "file %s\n", fsp
->fsp_name
));
199 ret
= remove_share_oplock(lck
, fsp
);
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
)));
205 release_file_oplock(fsp
);
211 * Deal with a reply when a break-to-level II was sent.
213 bool downgrade_oplock(files_struct
*fsp
)
216 struct share_mode_lock
*lck
;
218 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
221 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
222 "file %s\n", fsp
->fsp_name
));
225 ret
= downgrade_share_oplock(lck
, fsp
);
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
)));
232 downgrade_file_oplock(fsp
);
237 /****************************************************************************
238 Return the fd (if any) used for receiving oplock notifications.
239 ****************************************************************************/
241 int oplock_notify_fd(void)
244 return koplocks
->notification_fd
;
250 /****************************************************************************
251 Set up an oplock break message.
252 ****************************************************************************/
254 static char *new_break_smb_message(TALLOC_CTX
*mem_ctx
,
255 files_struct
*fsp
, uint8 cmd
)
257 char *result
= TALLOC_ARRAY(mem_ctx
, char, smb_size
+ 8*2 + 0);
259 if (result
== NULL
) {
260 DEBUG(0, ("talloc failed\n"));
264 memset(result
,'\0',smb_size
);
265 srv_set_message(result
,8,0,true);
266 SCVAL(result
,smb_com
,SMBlockingX
);
267 SSVAL(result
,smb_tid
,fsp
->conn
->cnum
);
268 SSVAL(result
,smb_pid
,0xFFFF);
269 SSVAL(result
,smb_uid
,0);
270 SSVAL(result
,smb_mid
,0xFFFF);
271 SCVAL(result
,smb_vwv0
,0xFF);
272 SSVAL(result
,smb_vwv2
,fsp
->fnum
);
273 SCVAL(result
,smb_vwv3
,LOCKING_ANDX_OPLOCK_RELEASE
);
274 SCVAL(result
,smb_vwv3
+1,cmd
);
278 /****************************************************************************
279 Function to do the waiting before sending a local break.
280 ****************************************************************************/
282 static void wait_before_sending_break(void)
284 long wait_time
= (long)lp_oplock_break_wait_time();
287 smb_msleep(wait_time
);
291 /****************************************************************************
292 Ensure that we have a valid oplock.
293 ****************************************************************************/
295 static files_struct
*initial_break_processing(struct file_id id
, unsigned long file_id
)
297 files_struct
*fsp
= NULL
;
299 if( DEBUGLVL( 3 ) ) {
300 dbgtext( "initial_break_processing: called for %s/%u\n",
301 file_id_string_tos(&id
), (int)file_id
);
302 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
303 exclusive_oplocks_open
, level_II_oplocks_open
);
307 * We need to search the file open table for the
308 * entry containing this dev and inode, and ensure
309 * we have an oplock on it.
312 fsp
= file_find_dif(id
, file_id
);
315 /* The file could have been closed in the meantime - return success. */
316 if( DEBUGLVL( 3 ) ) {
317 dbgtext( "initial_break_processing: cannot find open file with " );
318 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id
), file_id
);
319 dbgtext( "allowing break to succeed.\n" );
324 /* Ensure we have an oplock on the file */
327 * There is a potential race condition in that an oplock could
328 * have been broken due to another udp request, and yet there are
329 * still oplock break messages being sent in the udp message
330 * queue for this file. So return true if we don't have an oplock,
331 * as we may have just freed it.
334 if(fsp
->oplock_type
== NO_OPLOCK
) {
335 if( DEBUGLVL( 3 ) ) {
336 dbgtext( "initial_break_processing: file %s ", fsp
->fsp_name
);
337 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
338 file_id_string_tos(&id
), fsp
->fh
->gen_id
);
339 dbgtext( "Allowing break to succeed regardless.\n" );
347 static void oplock_timeout_handler(struct event_context
*ctx
,
348 struct timed_event
*te
,
352 files_struct
*fsp
= (files_struct
*)private_data
;
354 /* Remove the timed event handler. */
355 TALLOC_FREE(fsp
->oplock_timeout
);
356 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp
->fsp_name
));
357 global_client_failed_oplock_break
= True
;
359 reply_to_oplock_break_requests(fsp
);
362 /*******************************************************************
363 Add a timeout handler waiting for the client reply.
364 *******************************************************************/
366 static void add_oplock_timeout_handler(files_struct
*fsp
)
368 if (fsp
->oplock_timeout
!= NULL
) {
369 DEBUG(0, ("Logic problem -- have an oplock event hanging "
373 fsp
->oplock_timeout
=
374 event_add_timed(smbd_event_context(), NULL
,
375 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT
, 0),
376 oplock_timeout_handler
, fsp
);
378 if (fsp
->oplock_timeout
== NULL
) {
379 DEBUG(0, ("Could not add oplock timeout handler\n"));
383 /*******************************************************************
384 This handles the case of a write triggering a break to none
385 message on a level2 oplock.
386 When we get this message we may be in any of three states :
387 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
388 the client for LEVEL2.
389 *******************************************************************/
391 static void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
394 struct server_id src
,
397 struct share_mode_entry msg
;
402 if (data
->data
== NULL
) {
403 DEBUG(0, ("Got NULL buffer\n"));
407 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
408 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
412 /* De-linearize incoming message. */
413 message_to_share_mode_entry(&msg
, (char *)data
->data
);
415 DEBUG(10, ("Got oplock async level 2 break message from pid %d: %s/%lu\n",
416 (int)procid_to_pid(&src
), file_id_string_tos(&msg
.id
), msg
.share_file_id
));
418 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
421 /* We hit a race here. Break messages are sent, and before we
422 * get to process this message, we have closed the file.
423 * No need to reply as this is an async message. */
424 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
428 if (fsp
->oplock_type
== NO_OPLOCK
) {
429 /* We already got a "break to none" message and we've handled it.
431 DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
435 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
436 /* Don't tell the client, just downgrade. */
437 DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
442 /* Ensure we're really at level2 state. */
443 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
445 DEBUG(10,("process_oplock_async_level2_break_message: sending break to "
446 "none message for fid %d, file %s\n",
450 /* Now send a break to none message to our client. */
452 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
453 if (break_msg
== NULL
) {
454 exit_server("Could not talloc break_msg\n");
457 /* Need to wait before sending a break message if we sent ourselves this message. */
458 if (procid_to_pid(&src
) == sys_getpid()) {
459 wait_before_sending_break();
462 /* Save the server smb signing state. */
463 sign_state
= srv_oplock_set_signing(False
);
466 if (!srv_send_smb(smbd_server_fd(),
468 IS_CONN_ENCRYPTED(fsp
->conn
))) {
469 exit_server_cleanly("oplock_break: srv_send_smb failed.");
472 /* Restore the sign state to what it was. */
473 srv_oplock_set_signing(sign_state
);
475 TALLOC_FREE(break_msg
);
477 /* Async level2 request, don't send a reply, just remove the oplock. */
481 /*******************************************************************
482 This handles the generic oplock break message from another smbd.
483 *******************************************************************/
485 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
488 struct server_id src
,
491 struct share_mode_entry msg
;
494 bool break_to_level2
= False
;
497 if (data
->data
== NULL
) {
498 DEBUG(0, ("Got NULL buffer\n"));
502 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
503 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
507 /* De-linearize incoming message. */
508 message_to_share_mode_entry(&msg
, (char *)data
->data
);
510 DEBUG(10, ("Got oplock break message from pid %d: %s/%lu\n",
511 (int)procid_to_pid(&src
), file_id_string_tos(&msg
.id
), msg
.share_file_id
));
513 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
516 /* a We hit race here. Break messages are sent, and before we
517 * get to process this message, we have closed the file. Reply
518 * with 'ok, oplock broken' */
519 DEBUG(3, ("Did not find fsp\n"));
521 /* We just send the same message back. */
522 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
524 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
528 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
529 /* Remember we have to inform the requesting PID when the
532 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
533 &fsp
->pending_break_messages
,
534 &fsp
->num_pending_break_messages
);
538 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
539 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
540 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
541 file_id_string_tos(&fsp
->file_id
),
543 /* We just send the same message back. */
544 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
546 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
550 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
551 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
552 !koplocks
&& /* NOTE: we force levelII off for kernel oplocks -
553 * this will change when it is supported */
554 lp_level2_oplocks(SNUM(fsp
->conn
))) {
555 break_to_level2
= True
;
558 break_msg
= new_break_smb_message(NULL
, fsp
, break_to_level2
?
559 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
560 if (break_msg
== NULL
) {
561 exit_server("Could not talloc break_msg\n");
564 /* Need to wait before sending a break message if we sent ourselves this message. */
565 if (procid_to_pid(&src
) == sys_getpid()) {
566 wait_before_sending_break();
569 /* Save the server smb signing state. */
570 sign_state
= srv_oplock_set_signing(False
);
573 if (!srv_send_smb(smbd_server_fd(),
575 IS_CONN_ENCRYPTED(fsp
->conn
))) {
576 exit_server_cleanly("oplock_break: srv_send_smb failed.");
579 /* Restore the sign state to what it was. */
580 srv_oplock_set_signing(sign_state
);
582 TALLOC_FREE(break_msg
);
584 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
587 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
588 &fsp
->pending_break_messages
,
589 &fsp
->num_pending_break_messages
);
591 add_oplock_timeout_handler(fsp
);
594 /*******************************************************************
595 This handles the kernel oplock break message.
596 *******************************************************************/
598 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
601 struct server_id src
,
605 unsigned long file_id
;
610 if (data
->data
== NULL
) {
611 DEBUG(0, ("Got NULL buffer\n"));
615 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
616 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
620 /* Pull the data from the message. */
621 pull_file_id_16((char *)data
->data
, &id
);
622 file_id
= (unsigned long)IVAL(data
->data
, 16);
624 DEBUG(10, ("Got kernel oplock break message from pid %d: %s/%u\n",
625 (int)procid_to_pid(&src
), file_id_string_tos(&id
),
626 (unsigned int)file_id
));
628 fsp
= initial_break_processing(id
, file_id
);
631 DEBUG(3, ("Got a kernel oplock break message for a file "
632 "I don't know about\n"));
636 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
637 /* This is ok, kernel oplocks come in completely async */
638 DEBUG(3, ("Got a kernel oplock request while waiting for a "
643 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
644 if (break_msg
== NULL
) {
645 exit_server("Could not talloc break_msg\n");
648 /* Save the server smb signing state. */
649 sign_state
= srv_oplock_set_signing(False
);
652 if (!srv_send_smb(smbd_server_fd(),
654 IS_CONN_ENCRYPTED(fsp
->conn
))) {
655 exit_server_cleanly("oplock_break: srv_send_smb failed.");
658 /* Restore the sign state to what it was. */
659 srv_oplock_set_signing(sign_state
);
661 TALLOC_FREE(break_msg
);
663 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
665 add_oplock_timeout_handler(fsp
);
668 void reply_to_oplock_break_requests(files_struct
*fsp
)
672 for (i
=0; i
<fsp
->num_pending_break_messages
; i
++) {
673 struct share_mode_entry
*e
= &fsp
->pending_break_messages
[i
];
674 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
676 share_mode_entry_to_message(msg
, e
);
678 messaging_send_buf(smbd_messaging_context(), e
->pid
,
679 MSG_SMB_BREAK_RESPONSE
,
681 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
684 SAFE_FREE(fsp
->pending_break_messages
);
685 fsp
->num_pending_break_messages
= 0;
686 if (fsp
->oplock_timeout
!= NULL
) {
687 /* Remove the timed event handler. */
688 TALLOC_FREE(fsp
->oplock_timeout
);
689 fsp
->oplock_timeout
= NULL
;
694 static void process_oplock_break_response(struct messaging_context
*msg_ctx
,
697 struct server_id src
,
700 struct share_mode_entry msg
;
702 if (data
->data
== NULL
) {
703 DEBUG(0, ("Got NULL buffer\n"));
707 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
708 DEBUG(0, ("Got invalid msg len %u\n",
709 (unsigned int)data
->length
));
713 /* De-linearize incoming message. */
714 message_to_share_mode_entry(&msg
, (char *)data
->data
);
716 DEBUG(10, ("Got oplock break response from pid %d: %s/%lu mid %u\n",
717 (int)procid_to_pid(&src
), file_id_string_tos(&msg
.id
), msg
.share_file_id
,
718 (unsigned int)msg
.op_mid
));
720 /* Here's the hack from open.c, store the mid in the 'port' field */
721 schedule_deferred_open_smb_message(msg
.op_mid
);
724 static void process_open_retry_message(struct messaging_context
*msg_ctx
,
727 struct server_id src
,
730 struct share_mode_entry msg
;
732 if (data
->data
== NULL
) {
733 DEBUG(0, ("Got NULL buffer\n"));
737 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
738 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
742 /* De-linearize incoming message. */
743 message_to_share_mode_entry(&msg
, (char *)data
->data
);
745 DEBUG(10, ("Got open retry msg from pid %d: %s mid %u\n",
746 (int)procid_to_pid(&src
), file_id_string_tos(&msg
.id
),
747 (unsigned int)msg
.op_mid
));
749 schedule_deferred_open_smb_message(msg
.op_mid
);
752 /****************************************************************************
753 This function is called on any file modification or lock request. If a file
754 is level 2 oplocked then it must tell all other level 2 holders to break to
756 ****************************************************************************/
758 void release_level_2_oplocks_on_change(files_struct
*fsp
)
761 struct share_mode_lock
*lck
;
764 * If this file is level II oplocked then we need
765 * to grab the shared memory lock and inform all
766 * other files with a level II lock that they need
767 * to flush their read caches. We keep the lock over
768 * the shared memory area whilst doing this.
771 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
774 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
777 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
778 "share mode entry for file %s.\n", fsp
->fsp_name
));
782 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
783 lck
->num_share_modes
));
785 for(i
= 0; i
< lck
->num_share_modes
; i
++) {
786 struct share_mode_entry
*share_entry
= &lck
->share_modes
[i
];
787 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
789 if (!is_valid_share_mode_entry(share_entry
)) {
794 * As there could have been multiple writes waiting at the
795 * lock_share_entry gate we may not be the first to
796 * enter. Hence the state of the op_types in the share mode
797 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
798 * oplock. It will do no harm to re-send break messages to
799 * those smbd's that are still waiting their turn to remove
800 * their LEVEL_II state, and also no harm to ignore existing
801 * NO_OPLOCK states. JRA.
804 DEBUG(10,("release_level_2_oplocks_on_change: "
805 "share_entry[%i]->op_type == %d\n",
806 i
, share_entry
->op_type
));
808 if (share_entry
->op_type
== NO_OPLOCK
) {
813 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
814 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
815 "share mode entry %d is an exlusive "
821 share_mode_entry_to_message(msg
, share_entry
);
824 * Deal with a race condition when breaking level2
825 * oplocks. Don't send all the messages and release
826 * the lock, this allows someone else to come in and
827 * get a level2 lock before any of the messages are
828 * processed, and thus miss getting a break message.
829 * Ensure at least one entry (the one we're breaking)
830 * is processed immediately under the lock and becomes
831 * set as NO_OPLOCK to stop any waiter getting a level2.
835 if (procid_is_me(&share_entry
->pid
)) {
836 DATA_BLOB blob
= data_blob_const(msg
,
837 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
838 process_oplock_async_level2_break_message(smbd_messaging_context(),
840 MSG_SMB_ASYNC_LEVEL2_BREAK
,
844 messaging_send_buf(smbd_messaging_context(),
846 MSG_SMB_ASYNC_LEVEL2_BREAK
,
848 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
852 /* We let the message receivers handle removing the oplock state
853 in the share mode lock db. */
858 /****************************************************************************
859 Linearize a share mode entry struct to an internal oplock break message.
860 ****************************************************************************/
862 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
864 SIVAL(msg
,0,(uint32
)e
->pid
.pid
);
865 SSVAL(msg
,4,e
->op_mid
);
866 SSVAL(msg
,6,e
->op_type
);
867 SIVAL(msg
,8,e
->access_mask
);
868 SIVAL(msg
,12,e
->share_access
);
869 SIVAL(msg
,16,e
->private_options
);
870 SIVAL(msg
,20,(uint32
)e
->time
.tv_sec
);
871 SIVAL(msg
,24,(uint32
)e
->time
.tv_usec
);
872 push_file_id_16(msg
+28, &e
->id
);
873 SIVAL(msg
,44,e
->share_file_id
);
874 SIVAL(msg
,48,e
->uid
);
875 SSVAL(msg
,52,e
->flags
);
876 #ifdef CLUSTER_SUPPORT
877 SIVAL(msg
,54,e
->pid
.vnn
);
881 /****************************************************************************
882 De-linearize an internal oplock break message to a share mode entry struct.
883 ****************************************************************************/
885 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
887 e
->pid
.pid
= (pid_t
)IVAL(msg
,0);
888 e
->op_mid
= SVAL(msg
,4);
889 e
->op_type
= SVAL(msg
,6);
890 e
->access_mask
= IVAL(msg
,8);
891 e
->share_access
= IVAL(msg
,12);
892 e
->private_options
= IVAL(msg
,16);
893 e
->time
.tv_sec
= (time_t)IVAL(msg
,20);
894 e
->time
.tv_usec
= (int)IVAL(msg
,24);
895 pull_file_id_16(msg
+28, &e
->id
);
896 e
->share_file_id
= (unsigned long)IVAL(msg
,44);
897 e
->uid
= (uint32
)IVAL(msg
,48);
898 e
->flags
= (uint16
)SVAL(msg
,52);
899 #ifdef CLUSTER_SUPPORT
900 e
->pid
.vnn
= IVAL(msg
,54);
904 /****************************************************************************
905 Setup oplocks for this process.
906 ****************************************************************************/
908 bool init_oplocks(struct messaging_context
*msg_ctx
)
910 DEBUG(3,("init_oplocks: initializing messages.\n"));
912 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_REQUEST
,
913 process_oplock_break_message
);
914 messaging_register(msg_ctx
, NULL
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
915 process_oplock_async_level2_break_message
);
916 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_RESPONSE
,
917 process_oplock_break_response
);
918 messaging_register(msg_ctx
, NULL
, MSG_SMB_KERNEL_BREAK
,
919 process_kernel_oplock_break
);
920 messaging_register(msg_ctx
, NULL
, MSG_SMB_OPEN_RETRY
,
921 process_open_retry_message
);
923 if (lp_kernel_oplocks()) {
924 #if HAVE_KERNEL_OPLOCKS_IRIX
925 koplocks
= irix_init_kernel_oplocks();
926 #elif HAVE_KERNEL_OPLOCKS_LINUX
927 koplocks
= linux_init_kernel_oplocks();