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
== LEVEL_II_OPLOCK
)
62 && koplocks
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) {
63 DEBUG(10, ("Refusing level2 oplock, kernel oplocks don't "
67 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
68 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
70 !koplocks
->ops
->set_oplock(koplocks
, fsp
, oplock_type
)) {
74 fsp
->oplock_type
= oplock_type
;
75 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
76 if (oplock_type
== LEVEL_II_OPLOCK
) {
77 level_II_oplocks_open
++;
78 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
79 exclusive_oplocks_open
++;
82 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
83 "tv_sec = %x, tv_usec = %x\n",
84 fsp
->fsp_name
, file_id_string_tos(&fsp
->file_id
),
85 fsp
->fh
->gen_id
, (int)fsp
->open_time
.tv_sec
,
86 (int)fsp
->open_time
.tv_usec
));
91 /****************************************************************************
92 Attempt to release an oplock on a file. Decrements oplock count.
93 ****************************************************************************/
95 void release_file_oplock(files_struct
*fsp
)
97 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
98 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
100 koplocks
->ops
->release_oplock(koplocks
, fsp
, NO_OPLOCK
);
103 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
104 level_II_oplocks_open
--;
105 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
106 exclusive_oplocks_open
--;
109 SMB_ASSERT(exclusive_oplocks_open
>=0);
110 SMB_ASSERT(level_II_oplocks_open
>=0);
112 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
113 /* This doesn't matter for close. */
114 fsp
->oplock_type
= FAKE_LEVEL_II_OPLOCK
;
116 fsp
->oplock_type
= NO_OPLOCK
;
118 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
120 flush_write_cache(fsp
, OPLOCK_RELEASE_FLUSH
);
122 TALLOC_FREE(fsp
->oplock_timeout
);
125 /****************************************************************************
126 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
127 ****************************************************************************/
129 static void downgrade_file_oplock(files_struct
*fsp
)
131 if (!EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
132 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
137 koplocks
->ops
->release_oplock(koplocks
, fsp
, LEVEL_II_OPLOCK
);
139 fsp
->oplock_type
= LEVEL_II_OPLOCK
;
140 exclusive_oplocks_open
--;
141 level_II_oplocks_open
++;
142 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
145 /****************************************************************************
146 Remove a file oplock. Copes with level II and exclusive.
147 Locks then unlocks the share mode lock. Client can decide to go directly
148 to none even if a "break-to-level II" was sent.
149 ****************************************************************************/
151 bool remove_oplock(files_struct
*fsp
)
154 struct share_mode_lock
*lck
;
156 /* Remove the oplock flag from the sharemode. */
157 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
160 DEBUG(0,("remove_oplock: failed to lock share entry for "
161 "file %s\n", fsp
->fsp_name
));
164 ret
= remove_share_oplock(lck
, fsp
);
166 DEBUG(0,("remove_oplock: failed to remove share oplock for "
167 "file %s fnum %d, %s\n",
168 fsp
->fsp_name
, fsp
->fnum
, file_id_string_tos(&fsp
->file_id
)));
170 release_file_oplock(fsp
);
176 * Deal with a reply when a break-to-level II was sent.
178 bool downgrade_oplock(files_struct
*fsp
)
181 struct share_mode_lock
*lck
;
183 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
186 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
187 "file %s\n", fsp
->fsp_name
));
190 ret
= downgrade_share_oplock(lck
, fsp
);
192 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
193 "for file %s fnum %d, file_id %s\n",
194 fsp
->fsp_name
, fsp
->fnum
, file_id_string_tos(&fsp
->file_id
)));
197 downgrade_file_oplock(fsp
);
203 * Some kernel oplock implementations handle the notification themselves.
205 bool should_notify_deferred_opens()
208 (koplocks
->flags
& KOPLOCKS_DEFERRED_OPEN_NOTIFICATION
));
211 /****************************************************************************
212 Set up an oplock break message.
213 ****************************************************************************/
215 static char *new_break_smb_message(TALLOC_CTX
*mem_ctx
,
216 files_struct
*fsp
, uint8 cmd
)
218 char *result
= TALLOC_ARRAY(mem_ctx
, char, smb_size
+ 8*2 + 0);
220 if (result
== NULL
) {
221 DEBUG(0, ("talloc failed\n"));
225 memset(result
,'\0',smb_size
);
226 srv_set_message(result
,8,0,true);
227 SCVAL(result
,smb_com
,SMBlockingX
);
228 SSVAL(result
,smb_tid
,fsp
->conn
->cnum
);
229 SSVAL(result
,smb_pid
,0xFFFF);
230 SSVAL(result
,smb_uid
,0);
231 SSVAL(result
,smb_mid
,0xFFFF);
232 SCVAL(result
,smb_vwv0
,0xFF);
233 SSVAL(result
,smb_vwv2
,fsp
->fnum
);
234 SCVAL(result
,smb_vwv3
,LOCKING_ANDX_OPLOCK_RELEASE
);
235 SCVAL(result
,smb_vwv3
+1,cmd
);
239 /****************************************************************************
240 Function to do the waiting before sending a local break.
241 ****************************************************************************/
243 static void wait_before_sending_break(void)
245 long wait_time
= (long)lp_oplock_break_wait_time();
248 smb_msleep(wait_time
);
252 /****************************************************************************
253 Ensure that we have a valid oplock.
254 ****************************************************************************/
256 static files_struct
*initial_break_processing(struct file_id id
, unsigned long file_id
)
258 files_struct
*fsp
= NULL
;
260 if( DEBUGLVL( 3 ) ) {
261 dbgtext( "initial_break_processing: called for %s/%u\n",
262 file_id_string_tos(&id
), (int)file_id
);
263 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
264 exclusive_oplocks_open
, level_II_oplocks_open
);
268 * We need to search the file open table for the
269 * entry containing this dev and inode, and ensure
270 * we have an oplock on it.
273 fsp
= file_find_dif(id
, file_id
);
276 /* The file could have been closed in the meantime - return success. */
277 if( DEBUGLVL( 3 ) ) {
278 dbgtext( "initial_break_processing: cannot find open file with " );
279 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id
), file_id
);
280 dbgtext( "allowing break to succeed.\n" );
285 /* Ensure we have an oplock on the file */
288 * There is a potential race condition in that an oplock could
289 * have been broken due to another udp request, and yet there are
290 * still oplock break messages being sent in the udp message
291 * queue for this file. So return true if we don't have an oplock,
292 * as we may have just freed it.
295 if(fsp
->oplock_type
== NO_OPLOCK
) {
296 if( DEBUGLVL( 3 ) ) {
297 dbgtext( "initial_break_processing: file %s ", fsp
->fsp_name
);
298 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
299 file_id_string_tos(&id
), fsp
->fh
->gen_id
);
300 dbgtext( "Allowing break to succeed regardless.\n" );
308 static void oplock_timeout_handler(struct event_context
*ctx
,
309 struct timed_event
*te
,
313 files_struct
*fsp
= (files_struct
*)private_data
;
315 /* Remove the timed event handler. */
316 TALLOC_FREE(fsp
->oplock_timeout
);
317 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp
->fsp_name
));
318 global_client_failed_oplock_break
= True
;
320 reply_to_oplock_break_requests(fsp
);
323 /*******************************************************************
324 Add a timeout handler waiting for the client reply.
325 *******************************************************************/
327 static void add_oplock_timeout_handler(files_struct
*fsp
)
330 * If kernel oplocks already notifies smbds when an oplock break times
334 (koplocks
->flags
& KOPLOCKS_TIMEOUT_NOTIFICATION
)) {
338 if (fsp
->oplock_timeout
!= NULL
) {
339 DEBUG(0, ("Logic problem -- have an oplock event hanging "
343 fsp
->oplock_timeout
=
344 event_add_timed(smbd_event_context(), NULL
,
345 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT
, 0),
346 oplock_timeout_handler
, fsp
);
348 if (fsp
->oplock_timeout
== NULL
) {
349 DEBUG(0, ("Could not add oplock timeout handler\n"));
353 void break_level2_to_none_async(files_struct
*fsp
)
357 if (fsp
->oplock_type
== NO_OPLOCK
) {
358 /* We already got a "break to none" message and we've handled
359 * it. just ignore. */
360 DEBUG(3, ("process_oplock_async_level2_break_message: already "
361 "broken to none, ignoring.\n"));
365 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
366 /* Don't tell the client, just downgrade. */
367 DEBUG(3, ("process_oplock_async_level2_break_message: "
368 "downgrading fake level 2 oplock.\n"));
373 /* Ensure we're really at level2 state. */
374 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
376 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
377 "to none message for fid %d, file %s\n", fsp
->fnum
,
380 /* Now send a break to none message to our client. */
381 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
382 if (break_msg
== NULL
) {
383 exit_server("Could not talloc break_msg\n");
387 if (!srv_send_smb(smbd_server_fd(),
389 IS_CONN_ENCRYPTED(fsp
->conn
),
391 exit_server_cleanly("oplock_break: srv_send_smb failed.");
394 TALLOC_FREE(break_msg
);
396 /* Async level2 request, don't send a reply, just remove the oplock. */
401 /*******************************************************************
402 This handles the case of a write triggering a break to none
403 message on a level2 oplock.
404 When we get this message we may be in any of three states :
405 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
406 the client for LEVEL2.
407 *******************************************************************/
409 void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
412 struct server_id src
,
415 struct share_mode_entry msg
;
418 if (data
->data
== NULL
) {
419 DEBUG(0, ("Got NULL buffer\n"));
423 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
424 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
428 /* De-linearize incoming message. */
429 message_to_share_mode_entry(&msg
, (char *)data
->data
);
431 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
432 "%s/%lu\n", procid_str(debug_ctx(), &src
),
433 file_id_string_tos(&msg
.id
), msg
.share_file_id
));
435 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
438 /* We hit a race here. Break messages are sent, and before we
439 * get to process this message, we have closed the file.
440 * No need to reply as this is an async message. */
441 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
445 break_level2_to_none_async(fsp
);
448 /*******************************************************************
449 This handles the generic oplock break message from another smbd.
450 *******************************************************************/
452 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
455 struct server_id src
,
458 struct share_mode_entry msg
;
461 bool break_to_level2
= False
;
463 if (data
->data
== NULL
) {
464 DEBUG(0, ("Got NULL buffer\n"));
468 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
469 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
473 /* De-linearize incoming message. */
474 message_to_share_mode_entry(&msg
, (char *)data
->data
);
476 DEBUG(10, ("Got oplock break message from pid %s: %s/%lu\n",
477 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
480 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
483 /* a We hit race here. Break messages are sent, and before we
484 * get to process this message, we have closed the file. Reply
485 * with 'ok, oplock broken' */
486 DEBUG(3, ("Did not find fsp\n"));
488 /* We just send the same message back. */
489 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
491 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
495 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
496 /* Remember we have to inform the requesting PID when the
499 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
500 &fsp
->pending_break_messages
,
501 &fsp
->num_pending_break_messages
);
505 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
506 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
507 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
508 file_id_string_tos(&fsp
->file_id
),
510 /* We just send the same message back. */
511 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
513 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
517 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
518 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
519 !(koplocks
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) &&
520 lp_level2_oplocks(SNUM(fsp
->conn
))) {
521 break_to_level2
= True
;
524 break_msg
= new_break_smb_message(NULL
, fsp
, break_to_level2
?
525 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
526 if (break_msg
== NULL
) {
527 exit_server("Could not talloc break_msg\n");
530 /* Need to wait before sending a break message if we sent ourselves this message. */
531 if (procid_is_me(&src
)) {
532 wait_before_sending_break();
536 if (!srv_send_smb(smbd_server_fd(),
538 IS_CONN_ENCRYPTED(fsp
->conn
),
540 exit_server_cleanly("oplock_break: srv_send_smb failed.");
543 TALLOC_FREE(break_msg
);
545 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
548 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
549 &fsp
->pending_break_messages
,
550 &fsp
->num_pending_break_messages
);
552 add_oplock_timeout_handler(fsp
);
555 /*******************************************************************
556 This handles the kernel oplock break message.
557 *******************************************************************/
559 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
562 struct server_id src
,
566 unsigned long file_id
;
570 if (data
->data
== NULL
) {
571 DEBUG(0, ("Got NULL buffer\n"));
575 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
576 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
580 /* Pull the data from the message. */
581 pull_file_id_24((char *)data
->data
, &id
);
582 file_id
= (unsigned long)IVAL(data
->data
, 24);
584 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
585 procid_str(debug_ctx(), &src
), file_id_string_tos(&id
),
586 (unsigned int)file_id
));
588 fsp
= initial_break_processing(id
, file_id
);
591 DEBUG(3, ("Got a kernel oplock break message for a file "
592 "I don't know about\n"));
596 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
597 /* This is ok, kernel oplocks come in completely async */
598 DEBUG(3, ("Got a kernel oplock request while waiting for a "
603 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
604 if (break_msg
== NULL
) {
605 exit_server("Could not talloc break_msg\n");
609 if (!srv_send_smb(smbd_server_fd(),
611 IS_CONN_ENCRYPTED(fsp
->conn
),
613 exit_server_cleanly("oplock_break: srv_send_smb failed.");
616 TALLOC_FREE(break_msg
);
618 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
620 add_oplock_timeout_handler(fsp
);
623 void reply_to_oplock_break_requests(files_struct
*fsp
)
628 * If kernel oplocks already notifies smbds when oplocks are
629 * broken/removed, just return.
632 (koplocks
->flags
& KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION
)) {
636 for (i
=0; i
<fsp
->num_pending_break_messages
; i
++) {
637 struct share_mode_entry
*e
= &fsp
->pending_break_messages
[i
];
638 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
640 share_mode_entry_to_message(msg
, e
);
642 messaging_send_buf(smbd_messaging_context(), e
->pid
,
643 MSG_SMB_BREAK_RESPONSE
,
645 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
648 SAFE_FREE(fsp
->pending_break_messages
);
649 fsp
->num_pending_break_messages
= 0;
650 if (fsp
->oplock_timeout
!= NULL
) {
651 /* Remove the timed event handler. */
652 TALLOC_FREE(fsp
->oplock_timeout
);
653 fsp
->oplock_timeout
= NULL
;
658 static void process_oplock_break_response(struct messaging_context
*msg_ctx
,
661 struct server_id src
,
664 struct share_mode_entry msg
;
666 if (data
->data
== NULL
) {
667 DEBUG(0, ("Got NULL buffer\n"));
671 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
672 DEBUG(0, ("Got invalid msg len %u\n",
673 (unsigned int)data
->length
));
677 /* De-linearize incoming message. */
678 message_to_share_mode_entry(&msg
, (char *)data
->data
);
680 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %u\n",
681 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
682 msg
.share_file_id
, (unsigned int)msg
.op_mid
));
684 /* Here's the hack from open.c, store the mid in the 'port' field */
685 schedule_deferred_open_smb_message(msg
.op_mid
);
688 static void process_open_retry_message(struct messaging_context
*msg_ctx
,
691 struct server_id src
,
694 struct share_mode_entry msg
;
696 if (data
->data
== NULL
) {
697 DEBUG(0, ("Got NULL buffer\n"));
701 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
702 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
706 /* De-linearize incoming message. */
707 message_to_share_mode_entry(&msg
, (char *)data
->data
);
709 DEBUG(10, ("Got open retry msg from pid %s: %s mid %u\n",
710 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
711 (unsigned int)msg
.op_mid
));
713 schedule_deferred_open_smb_message(msg
.op_mid
);
716 /****************************************************************************
717 This function is called on any file modification or lock request. If a file
718 is level 2 oplocked then it must tell all other level 2 holders to break to
720 ****************************************************************************/
722 static void contend_level2_oplocks_begin_default(files_struct
*fsp
,
723 enum level2_contention_type type
)
726 struct share_mode_lock
*lck
;
729 * If this file is level II oplocked then we need
730 * to grab the shared memory lock and inform all
731 * other files with a level II lock that they need
732 * to flush their read caches. We keep the lock over
733 * the shared memory area whilst doing this.
736 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
739 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
742 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
743 "share mode entry for file %s.\n", fsp
->fsp_name
));
747 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
748 lck
->num_share_modes
));
750 for(i
= 0; i
< lck
->num_share_modes
; i
++) {
751 struct share_mode_entry
*share_entry
= &lck
->share_modes
[i
];
752 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
754 if (!is_valid_share_mode_entry(share_entry
)) {
759 * As there could have been multiple writes waiting at the
760 * lock_share_entry gate we may not be the first to
761 * enter. Hence the state of the op_types in the share mode
762 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
763 * oplock. It will do no harm to re-send break messages to
764 * those smbd's that are still waiting their turn to remove
765 * their LEVEL_II state, and also no harm to ignore existing
766 * NO_OPLOCK states. JRA.
769 DEBUG(10,("release_level_2_oplocks_on_change: "
770 "share_entry[%i]->op_type == %d\n",
771 i
, share_entry
->op_type
));
773 if (share_entry
->op_type
== NO_OPLOCK
) {
778 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
779 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
780 "share mode entry %d is an exlusive "
786 share_mode_entry_to_message(msg
, share_entry
);
789 * Deal with a race condition when breaking level2
790 * oplocks. Don't send all the messages and release
791 * the lock, this allows someone else to come in and
792 * get a level2 lock before any of the messages are
793 * processed, and thus miss getting a break message.
794 * Ensure at least one entry (the one we're breaking)
795 * is processed immediately under the lock and becomes
796 * set as NO_OPLOCK to stop any waiter getting a level2.
800 if (procid_is_me(&share_entry
->pid
)) {
801 wait_before_sending_break();
802 break_level2_to_none_async(fsp
);
804 messaging_send_buf(smbd_messaging_context(),
806 MSG_SMB_ASYNC_LEVEL2_BREAK
,
808 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
812 /* We let the message receivers handle removing the oplock state
813 in the share mode lock db. */
818 void contend_level2_oplocks_begin(files_struct
*fsp
,
819 enum level2_contention_type type
)
821 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_begin
) {
822 koplocks
->ops
->contend_level2_oplocks_begin(fsp
, type
);
826 contend_level2_oplocks_begin_default(fsp
, type
);
829 void contend_level2_oplocks_end(files_struct
*fsp
,
830 enum level2_contention_type type
)
832 /* Only kernel oplocks implement this so far */
833 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_end
) {
834 koplocks
->ops
->contend_level2_oplocks_end(fsp
, type
);
838 /****************************************************************************
839 Linearize a share mode entry struct to an internal oplock break message.
840 ****************************************************************************/
842 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
844 SIVAL(msg
,0,(uint32
)e
->pid
.pid
);
845 SSVAL(msg
,4,e
->op_mid
);
846 SSVAL(msg
,6,e
->op_type
);
847 SIVAL(msg
,8,e
->access_mask
);
848 SIVAL(msg
,12,e
->share_access
);
849 SIVAL(msg
,16,e
->private_options
);
850 SIVAL(msg
,20,(uint32
)e
->time
.tv_sec
);
851 SIVAL(msg
,24,(uint32
)e
->time
.tv_usec
);
852 push_file_id_24(msg
+28, &e
->id
);
853 SIVAL(msg
,52,e
->share_file_id
);
854 SIVAL(msg
,56,e
->uid
);
855 SSVAL(msg
,60,e
->flags
);
856 #ifdef CLUSTER_SUPPORT
857 SIVAL(msg
,62,e
->pid
.vnn
);
861 /****************************************************************************
862 De-linearize an internal oplock break message to a share mode entry struct.
863 ****************************************************************************/
865 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
867 e
->pid
.pid
= (pid_t
)IVAL(msg
,0);
868 e
->op_mid
= SVAL(msg
,4);
869 e
->op_type
= SVAL(msg
,6);
870 e
->access_mask
= IVAL(msg
,8);
871 e
->share_access
= IVAL(msg
,12);
872 e
->private_options
= IVAL(msg
,16);
873 e
->time
.tv_sec
= (time_t)IVAL(msg
,20);
874 e
->time
.tv_usec
= (int)IVAL(msg
,24);
875 pull_file_id_24(msg
+28, &e
->id
);
876 e
->share_file_id
= (unsigned long)IVAL(msg
,52);
877 e
->uid
= (uint32
)IVAL(msg
,56);
878 e
->flags
= (uint16
)SVAL(msg
,60);
879 #ifdef CLUSTER_SUPPORT
880 e
->pid
.vnn
= IVAL(msg
,62);
884 /****************************************************************************
885 Setup oplocks for this process.
886 ****************************************************************************/
888 bool init_oplocks(struct messaging_context
*msg_ctx
)
890 DEBUG(3,("init_oplocks: initializing messages.\n"));
892 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_REQUEST
,
893 process_oplock_break_message
);
894 messaging_register(msg_ctx
, NULL
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
895 process_oplock_async_level2_break_message
);
896 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_RESPONSE
,
897 process_oplock_break_response
);
898 messaging_register(msg_ctx
, NULL
, MSG_SMB_KERNEL_BREAK
,
899 process_kernel_oplock_break
);
900 messaging_register(msg_ctx
, NULL
, MSG_SMB_OPEN_RETRY
,
901 process_open_retry_message
);
903 if (lp_kernel_oplocks()) {
904 #if HAVE_KERNEL_OPLOCKS_IRIX
905 koplocks
= irix_init_kernel_oplocks(talloc_autofree_context());
906 #elif HAVE_KERNEL_OPLOCKS_LINUX
907 koplocks
= linux_init_kernel_oplocks(talloc_autofree_context());
909 koplocks
= onefs_init_kernel_oplocks(talloc_autofree_context());