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
24 #include "smbd/globals.h"
26 /****************************************************************************
27 Get the number of current exclusive oplocks.
28 ****************************************************************************/
30 int32
get_number_of_exclusive_open_oplocks(void)
32 return exclusive_oplocks_open
;
36 * helper function used by the kernel oplock backends to post the break message
38 void break_kernel_oplock(struct messaging_context
*msg_ctx
, files_struct
*fsp
)
40 uint8_t msg
[MSG_SMB_KERNEL_BREAK_SIZE
];
42 /* Put the kernel break info into the message. */
43 push_file_id_24((char *)msg
, &fsp
->file_id
);
44 SIVAL(msg
,24,fsp
->fh
->gen_id
);
46 /* Don't need to be root here as we're only ever
47 sending to ourselves. */
49 messaging_send_buf(msg_ctx
, procid_self(),
51 msg
, MSG_SMB_KERNEL_BREAK_SIZE
);
54 /****************************************************************************
55 Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
56 disabled (just sets flags). Returns True if oplock set.
57 ****************************************************************************/
59 bool set_file_oplock(files_struct
*fsp
, int oplock_type
)
61 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
62 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
64 !koplocks
->ops
->set_oplock(koplocks
, fsp
, oplock_type
)) {
68 fsp
->oplock_type
= oplock_type
;
69 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
70 if (oplock_type
== LEVEL_II_OPLOCK
) {
71 level_II_oplocks_open
++;
72 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
73 exclusive_oplocks_open
++;
76 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
77 "tv_sec = %x, tv_usec = %x\n",
78 fsp
->fsp_name
, file_id_string_tos(&fsp
->file_id
),
79 fsp
->fh
->gen_id
, (int)fsp
->open_time
.tv_sec
,
80 (int)fsp
->open_time
.tv_usec
));
85 /****************************************************************************
86 Attempt to release an oplock on a file. Decrements oplock count.
87 ****************************************************************************/
89 void release_file_oplock(files_struct
*fsp
)
91 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
92 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
94 koplocks
->ops
->release_oplock(koplocks
, fsp
, NO_OPLOCK
);
97 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
98 level_II_oplocks_open
--;
99 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
100 exclusive_oplocks_open
--;
103 SMB_ASSERT(exclusive_oplocks_open
>=0);
104 SMB_ASSERT(level_II_oplocks_open
>=0);
106 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
107 /* This doesn't matter for close. */
108 fsp
->oplock_type
= FAKE_LEVEL_II_OPLOCK
;
110 fsp
->oplock_type
= NO_OPLOCK
;
112 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
114 flush_write_cache(fsp
, OPLOCK_RELEASE_FLUSH
);
116 TALLOC_FREE(fsp
->oplock_timeout
);
119 /****************************************************************************
120 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
121 ****************************************************************************/
123 static void downgrade_file_oplock(files_struct
*fsp
)
125 if (!EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
126 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
131 koplocks
->ops
->release_oplock(koplocks
, fsp
, LEVEL_II_OPLOCK
);
133 fsp
->oplock_type
= LEVEL_II_OPLOCK
;
134 exclusive_oplocks_open
--;
135 level_II_oplocks_open
++;
136 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
139 /****************************************************************************
140 Remove a file oplock. Copes with level II and exclusive.
141 Locks then unlocks the share mode lock. Client can decide to go directly
142 to none even if a "break-to-level II" was sent.
143 ****************************************************************************/
145 bool remove_oplock(files_struct
*fsp
)
148 struct share_mode_lock
*lck
;
150 /* Remove the oplock flag from the sharemode. */
151 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
154 DEBUG(0,("remove_oplock: failed to lock share entry for "
155 "file %s\n", fsp
->fsp_name
));
158 ret
= remove_share_oplock(lck
, fsp
);
160 DEBUG(0,("remove_oplock: failed to remove share oplock for "
161 "file %s fnum %d, %s\n",
162 fsp
->fsp_name
, fsp
->fnum
, file_id_string_tos(&fsp
->file_id
)));
164 release_file_oplock(fsp
);
170 * Deal with a reply when a break-to-level II was sent.
172 bool downgrade_oplock(files_struct
*fsp
)
175 struct share_mode_lock
*lck
;
177 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
180 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
181 "file %s\n", fsp
->fsp_name
));
184 ret
= downgrade_share_oplock(lck
, fsp
);
186 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
187 "for file %s fnum %d, file_id %s\n",
188 fsp
->fsp_name
, fsp
->fnum
, file_id_string_tos(&fsp
->file_id
)));
191 downgrade_file_oplock(fsp
);
197 * Some kernel oplock implementations handle the notification themselves.
199 bool should_notify_deferred_opens()
202 (koplocks
->flags
& KOPLOCKS_DEFERRED_OPEN_NOTIFICATION
));
205 /****************************************************************************
206 Set up an oplock break message.
207 ****************************************************************************/
209 static char *new_break_smb_message(TALLOC_CTX
*mem_ctx
,
210 files_struct
*fsp
, uint8 cmd
)
212 char *result
= TALLOC_ARRAY(mem_ctx
, char, smb_size
+ 8*2 + 0);
214 if (result
== NULL
) {
215 DEBUG(0, ("talloc failed\n"));
219 memset(result
,'\0',smb_size
);
220 srv_set_message(result
,8,0,true);
221 SCVAL(result
,smb_com
,SMBlockingX
);
222 SSVAL(result
,smb_tid
,fsp
->conn
->cnum
);
223 SSVAL(result
,smb_pid
,0xFFFF);
224 SSVAL(result
,smb_uid
,0);
225 SSVAL(result
,smb_mid
,0xFFFF);
226 SCVAL(result
,smb_vwv0
,0xFF);
227 SSVAL(result
,smb_vwv2
,fsp
->fnum
);
228 SCVAL(result
,smb_vwv3
,LOCKING_ANDX_OPLOCK_RELEASE
);
229 SCVAL(result
,smb_vwv3
+1,cmd
);
233 /****************************************************************************
234 Function to do the waiting before sending a local break.
235 ****************************************************************************/
237 static void wait_before_sending_break(void)
239 long wait_time
= (long)lp_oplock_break_wait_time();
242 smb_msleep(wait_time
);
246 /****************************************************************************
247 Ensure that we have a valid oplock.
248 ****************************************************************************/
250 static files_struct
*initial_break_processing(struct file_id id
, unsigned long file_id
)
252 files_struct
*fsp
= NULL
;
254 if( DEBUGLVL( 3 ) ) {
255 dbgtext( "initial_break_processing: called for %s/%u\n",
256 file_id_string_tos(&id
), (int)file_id
);
257 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
258 exclusive_oplocks_open
, level_II_oplocks_open
);
262 * We need to search the file open table for the
263 * entry containing this dev and inode, and ensure
264 * we have an oplock on it.
267 fsp
= file_find_dif(id
, file_id
);
270 /* The file could have been closed in the meantime - return success. */
271 if( DEBUGLVL( 3 ) ) {
272 dbgtext( "initial_break_processing: cannot find open file with " );
273 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id
), file_id
);
274 dbgtext( "allowing break to succeed.\n" );
279 /* Ensure we have an oplock on the file */
282 * There is a potential race condition in that an oplock could
283 * have been broken due to another udp request, and yet there are
284 * still oplock break messages being sent in the udp message
285 * queue for this file. So return true if we don't have an oplock,
286 * as we may have just freed it.
289 if(fsp
->oplock_type
== NO_OPLOCK
) {
290 if( DEBUGLVL( 3 ) ) {
291 dbgtext( "initial_break_processing: file %s ", fsp
->fsp_name
);
292 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
293 file_id_string_tos(&id
), fsp
->fh
->gen_id
);
294 dbgtext( "Allowing break to succeed regardless.\n" );
302 static void oplock_timeout_handler(struct event_context
*ctx
,
303 struct timed_event
*te
,
307 files_struct
*fsp
= (files_struct
*)private_data
;
309 /* Remove the timed event handler. */
310 TALLOC_FREE(fsp
->oplock_timeout
);
311 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp
->fsp_name
));
312 global_client_failed_oplock_break
= True
;
314 reply_to_oplock_break_requests(fsp
);
317 /*******************************************************************
318 Add a timeout handler waiting for the client reply.
319 *******************************************************************/
321 static void add_oplock_timeout_handler(files_struct
*fsp
)
324 * If kernel oplocks already notifies smbds when an oplock break times
328 (koplocks
->flags
& KOPLOCKS_TIMEOUT_NOTIFICATION
)) {
332 if (fsp
->oplock_timeout
!= NULL
) {
333 DEBUG(0, ("Logic problem -- have an oplock event hanging "
337 fsp
->oplock_timeout
=
338 event_add_timed(smbd_event_context(), NULL
,
339 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT
, 0),
340 oplock_timeout_handler
, fsp
);
342 if (fsp
->oplock_timeout
== NULL
) {
343 DEBUG(0, ("Could not add oplock timeout handler\n"));
347 /*******************************************************************
348 This handles the case of a write triggering a break to none
349 message on a level2 oplock.
350 When we get this message we may be in any of three states :
351 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
352 the client for LEVEL2.
353 *******************************************************************/
355 void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
358 struct server_id src
,
361 struct share_mode_entry msg
;
365 if (data
->data
== NULL
) {
366 DEBUG(0, ("Got NULL buffer\n"));
370 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
371 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
375 /* De-linearize incoming message. */
376 message_to_share_mode_entry(&msg
, (char *)data
->data
);
378 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
379 "%s/%lu\n", procid_str(debug_ctx(), &src
),
380 file_id_string_tos(&msg
.id
), msg
.share_file_id
));
382 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
385 /* We hit a race here. Break messages are sent, and before we
386 * get to process this message, we have closed the file.
387 * No need to reply as this is an async message. */
388 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
392 if (fsp
->oplock_type
== NO_OPLOCK
) {
393 /* We already got a "break to none" message and we've handled it.
395 DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
399 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
400 /* Don't tell the client, just downgrade. */
401 DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
406 /* Ensure we're really at level2 state. */
407 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
409 DEBUG(10,("process_oplock_async_level2_break_message: sending break to "
410 "none message for fid %d, file %s\n",
414 /* Now send a break to none message to our client. */
416 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
417 if (break_msg
== NULL
) {
418 exit_server("Could not talloc break_msg\n");
421 /* Need to wait before sending a break message if we sent ourselves this message. */
422 if (procid_is_me(&src
)) {
423 wait_before_sending_break();
427 if (!srv_send_smb(smbd_server_fd(),
429 IS_CONN_ENCRYPTED(fsp
->conn
),
431 exit_server_cleanly("oplock_break: srv_send_smb failed.");
434 TALLOC_FREE(break_msg
);
436 /* Async level2 request, don't send a reply, just remove the oplock. */
440 /*******************************************************************
441 This handles the generic oplock break message from another smbd.
442 *******************************************************************/
444 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
447 struct server_id src
,
450 struct share_mode_entry msg
;
453 bool break_to_level2
= False
;
455 if (data
->data
== NULL
) {
456 DEBUG(0, ("Got NULL buffer\n"));
460 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
461 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
465 /* De-linearize incoming message. */
466 message_to_share_mode_entry(&msg
, (char *)data
->data
);
468 DEBUG(10, ("Got oplock break message from pid %s: %s/%lu\n",
469 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
472 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
475 /* a We hit race here. Break messages are sent, and before we
476 * get to process this message, we have closed the file. Reply
477 * with 'ok, oplock broken' */
478 DEBUG(3, ("Did not find fsp\n"));
480 /* We just send the same message back. */
481 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
483 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
487 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
488 /* Remember we have to inform the requesting PID when the
491 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
492 &fsp
->pending_break_messages
,
493 &fsp
->num_pending_break_messages
);
497 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
498 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
499 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
500 file_id_string_tos(&fsp
->file_id
),
502 /* We just send the same message back. */
503 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
505 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
509 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
510 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
511 !(koplocks
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) &&
512 lp_level2_oplocks(SNUM(fsp
->conn
))) {
513 break_to_level2
= True
;
516 break_msg
= new_break_smb_message(NULL
, fsp
, break_to_level2
?
517 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
518 if (break_msg
== NULL
) {
519 exit_server("Could not talloc break_msg\n");
522 /* Need to wait before sending a break message if we sent ourselves this message. */
523 if (procid_is_me(&src
)) {
524 wait_before_sending_break();
528 if (!srv_send_smb(smbd_server_fd(),
530 IS_CONN_ENCRYPTED(fsp
->conn
),
532 exit_server_cleanly("oplock_break: srv_send_smb failed.");
535 TALLOC_FREE(break_msg
);
537 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
540 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
541 &fsp
->pending_break_messages
,
542 &fsp
->num_pending_break_messages
);
544 add_oplock_timeout_handler(fsp
);
547 /*******************************************************************
548 This handles the kernel oplock break message.
549 *******************************************************************/
551 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
554 struct server_id src
,
558 unsigned long file_id
;
562 if (data
->data
== NULL
) {
563 DEBUG(0, ("Got NULL buffer\n"));
567 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
568 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
572 /* Pull the data from the message. */
573 pull_file_id_24((char *)data
->data
, &id
);
574 file_id
= (unsigned long)IVAL(data
->data
, 24);
576 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
577 procid_str(debug_ctx(), &src
), file_id_string_tos(&id
),
578 (unsigned int)file_id
));
580 fsp
= initial_break_processing(id
, file_id
);
583 DEBUG(3, ("Got a kernel oplock break message for a file "
584 "I don't know about\n"));
588 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
589 /* This is ok, kernel oplocks come in completely async */
590 DEBUG(3, ("Got a kernel oplock request while waiting for a "
595 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
596 if (break_msg
== NULL
) {
597 exit_server("Could not talloc break_msg\n");
601 if (!srv_send_smb(smbd_server_fd(),
603 IS_CONN_ENCRYPTED(fsp
->conn
),
605 exit_server_cleanly("oplock_break: srv_send_smb failed.");
608 TALLOC_FREE(break_msg
);
610 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
612 add_oplock_timeout_handler(fsp
);
615 void reply_to_oplock_break_requests(files_struct
*fsp
)
620 * If kernel oplocks already notifies smbds when oplocks are
621 * broken/removed, just return.
624 (koplocks
->flags
& KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION
)) {
628 for (i
=0; i
<fsp
->num_pending_break_messages
; i
++) {
629 struct share_mode_entry
*e
= &fsp
->pending_break_messages
[i
];
630 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
632 share_mode_entry_to_message(msg
, e
);
634 messaging_send_buf(smbd_messaging_context(), e
->pid
,
635 MSG_SMB_BREAK_RESPONSE
,
637 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
640 SAFE_FREE(fsp
->pending_break_messages
);
641 fsp
->num_pending_break_messages
= 0;
642 if (fsp
->oplock_timeout
!= NULL
) {
643 /* Remove the timed event handler. */
644 TALLOC_FREE(fsp
->oplock_timeout
);
645 fsp
->oplock_timeout
= NULL
;
650 static void process_oplock_break_response(struct messaging_context
*msg_ctx
,
653 struct server_id src
,
656 struct share_mode_entry msg
;
658 if (data
->data
== NULL
) {
659 DEBUG(0, ("Got NULL buffer\n"));
663 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
664 DEBUG(0, ("Got invalid msg len %u\n",
665 (unsigned int)data
->length
));
669 /* De-linearize incoming message. */
670 message_to_share_mode_entry(&msg
, (char *)data
->data
);
672 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %u\n",
673 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
674 msg
.share_file_id
, (unsigned int)msg
.op_mid
));
676 /* Here's the hack from open.c, store the mid in the 'port' field */
677 schedule_deferred_open_smb_message(msg
.op_mid
);
680 static void process_open_retry_message(struct messaging_context
*msg_ctx
,
683 struct server_id src
,
686 struct share_mode_entry msg
;
688 if (data
->data
== NULL
) {
689 DEBUG(0, ("Got NULL buffer\n"));
693 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
694 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
698 /* De-linearize incoming message. */
699 message_to_share_mode_entry(&msg
, (char *)data
->data
);
701 DEBUG(10, ("Got open retry msg from pid %s: %s mid %u\n",
702 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
703 (unsigned int)msg
.op_mid
));
705 schedule_deferred_open_smb_message(msg
.op_mid
);
708 /****************************************************************************
709 This function is called on any file modification or lock request. If a file
710 is level 2 oplocked then it must tell all other level 2 holders to break to
712 ****************************************************************************/
714 static void contend_level2_oplocks_begin_default(files_struct
*fsp
,
715 enum level2_contention_type type
)
718 struct share_mode_lock
*lck
;
721 * If this file is level II oplocked then we need
722 * to grab the shared memory lock and inform all
723 * other files with a level II lock that they need
724 * to flush their read caches. We keep the lock over
725 * the shared memory area whilst doing this.
728 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
731 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
734 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
735 "share mode entry for file %s.\n", fsp
->fsp_name
));
739 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
740 lck
->num_share_modes
));
742 for(i
= 0; i
< lck
->num_share_modes
; i
++) {
743 struct share_mode_entry
*share_entry
= &lck
->share_modes
[i
];
744 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
746 if (!is_valid_share_mode_entry(share_entry
)) {
751 * As there could have been multiple writes waiting at the
752 * lock_share_entry gate we may not be the first to
753 * enter. Hence the state of the op_types in the share mode
754 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
755 * oplock. It will do no harm to re-send break messages to
756 * those smbd's that are still waiting their turn to remove
757 * their LEVEL_II state, and also no harm to ignore existing
758 * NO_OPLOCK states. JRA.
761 DEBUG(10,("release_level_2_oplocks_on_change: "
762 "share_entry[%i]->op_type == %d\n",
763 i
, share_entry
->op_type
));
765 if (share_entry
->op_type
== NO_OPLOCK
) {
770 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
771 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
772 "share mode entry %d is an exlusive "
778 share_mode_entry_to_message(msg
, share_entry
);
781 * Deal with a race condition when breaking level2
782 * oplocks. Don't send all the messages and release
783 * the lock, this allows someone else to come in and
784 * get a level2 lock before any of the messages are
785 * processed, and thus miss getting a break message.
786 * Ensure at least one entry (the one we're breaking)
787 * is processed immediately under the lock and becomes
788 * set as NO_OPLOCK to stop any waiter getting a level2.
792 if (procid_is_me(&share_entry
->pid
)) {
793 DATA_BLOB blob
= data_blob_const(msg
,
794 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
795 process_oplock_async_level2_break_message(smbd_messaging_context(),
797 MSG_SMB_ASYNC_LEVEL2_BREAK
,
801 messaging_send_buf(smbd_messaging_context(),
803 MSG_SMB_ASYNC_LEVEL2_BREAK
,
805 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
809 /* We let the message receivers handle removing the oplock state
810 in the share mode lock db. */
815 void contend_level2_oplocks_begin(files_struct
*fsp
,
816 enum level2_contention_type type
)
818 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_begin
) {
819 koplocks
->ops
->contend_level2_oplocks_begin(fsp
, type
);
823 contend_level2_oplocks_begin_default(fsp
, type
);
826 void contend_level2_oplocks_end(files_struct
*fsp
,
827 enum level2_contention_type type
)
829 /* Only kernel oplocks implement this so far */
830 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_end
) {
831 koplocks
->ops
->contend_level2_oplocks_end(fsp
, type
);
835 /****************************************************************************
836 Linearize a share mode entry struct to an internal oplock break message.
837 ****************************************************************************/
839 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
841 SIVAL(msg
,0,(uint32
)e
->pid
.pid
);
842 SSVAL(msg
,4,e
->op_mid
);
843 SSVAL(msg
,6,e
->op_type
);
844 SIVAL(msg
,8,e
->access_mask
);
845 SIVAL(msg
,12,e
->share_access
);
846 SIVAL(msg
,16,e
->private_options
);
847 SIVAL(msg
,20,(uint32
)e
->time
.tv_sec
);
848 SIVAL(msg
,24,(uint32
)e
->time
.tv_usec
);
849 push_file_id_24(msg
+28, &e
->id
);
850 SIVAL(msg
,52,e
->share_file_id
);
851 SIVAL(msg
,56,e
->uid
);
852 SSVAL(msg
,60,e
->flags
);
853 #ifdef CLUSTER_SUPPORT
854 SIVAL(msg
,62,e
->pid
.vnn
);
858 /****************************************************************************
859 De-linearize an internal oplock break message to a share mode entry struct.
860 ****************************************************************************/
862 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
864 e
->pid
.pid
= (pid_t
)IVAL(msg
,0);
865 e
->op_mid
= SVAL(msg
,4);
866 e
->op_type
= SVAL(msg
,6);
867 e
->access_mask
= IVAL(msg
,8);
868 e
->share_access
= IVAL(msg
,12);
869 e
->private_options
= IVAL(msg
,16);
870 e
->time
.tv_sec
= (time_t)IVAL(msg
,20);
871 e
->time
.tv_usec
= (int)IVAL(msg
,24);
872 pull_file_id_24(msg
+28, &e
->id
);
873 e
->share_file_id
= (unsigned long)IVAL(msg
,52);
874 e
->uid
= (uint32
)IVAL(msg
,56);
875 e
->flags
= (uint16
)SVAL(msg
,60);
876 #ifdef CLUSTER_SUPPORT
877 e
->pid
.vnn
= IVAL(msg
,62);
881 /****************************************************************************
882 Setup oplocks for this process.
883 ****************************************************************************/
885 bool init_oplocks(struct messaging_context
*msg_ctx
)
887 DEBUG(3,("init_oplocks: initializing messages.\n"));
889 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_REQUEST
,
890 process_oplock_break_message
);
891 messaging_register(msg_ctx
, NULL
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
892 process_oplock_async_level2_break_message
);
893 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_RESPONSE
,
894 process_oplock_break_response
);
895 messaging_register(msg_ctx
, NULL
, MSG_SMB_KERNEL_BREAK
,
896 process_kernel_oplock_break
);
897 messaging_register(msg_ctx
, NULL
, MSG_SMB_OPEN_RETRY
,
898 process_open_retry_message
);
900 if (lp_kernel_oplocks()) {
901 #if HAVE_KERNEL_OPLOCKS_IRIX
902 koplocks
= irix_init_kernel_oplocks(talloc_autofree_context());
903 #elif HAVE_KERNEL_OPLOCKS_LINUX
904 koplocks
= linux_init_kernel_oplocks(talloc_autofree_context());
906 koplocks
= onefs_init_kernel_oplocks(talloc_autofree_context());