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
)
358 if (fsp
->oplock_type
== NO_OPLOCK
) {
359 /* We already got a "break to none" message and we've handled
360 * it. just ignore. */
361 DEBUG(3, ("process_oplock_async_level2_break_message: already "
362 "broken to none, ignoring.\n"));
366 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
367 /* Don't tell the client, just downgrade. */
368 DEBUG(3, ("process_oplock_async_level2_break_message: "
369 "downgrading fake level 2 oplock.\n"));
374 /* Ensure we're really at level2 state. */
375 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
377 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
378 "to none message for fid %d, file %s\n", fsp
->fnum
,
381 /* Now send a break to none message to our client. */
382 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
383 if (break_msg
== NULL
) {
384 exit_server("Could not talloc break_msg\n");
387 /* Save the server smb signing state. */
388 sign_state
= srv_oplock_set_signing(False
);
391 if (!srv_send_smb(smbd_server_fd(),
393 IS_CONN_ENCRYPTED(fsp
->conn
),
395 exit_server_cleanly("oplock_break: srv_send_smb failed.");
398 /* Restore the sign state to what it was. */
399 srv_oplock_set_signing(sign_state
);
401 TALLOC_FREE(break_msg
);
403 /* Async level2 request, don't send a reply, just remove the oplock. */
408 /*******************************************************************
409 This handles the case of a write triggering a break to none
410 message on a level2 oplock.
411 When we get this message we may be in any of three states :
412 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
413 the client for LEVEL2.
414 *******************************************************************/
416 void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
419 struct server_id src
,
422 struct share_mode_entry msg
;
425 if (data
->data
== NULL
) {
426 DEBUG(0, ("Got NULL buffer\n"));
430 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
431 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
435 /* De-linearize incoming message. */
436 message_to_share_mode_entry(&msg
, (char *)data
->data
);
438 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
439 "%s/%lu\n", procid_str(debug_ctx(), &src
),
440 file_id_string_tos(&msg
.id
), msg
.share_file_id
));
442 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
445 /* We hit a race here. Break messages are sent, and before we
446 * get to process this message, we have closed the file.
447 * No need to reply as this is an async message. */
448 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
452 break_level2_to_none_async(fsp
);
455 /*******************************************************************
456 This handles the generic oplock break message from another smbd.
457 *******************************************************************/
459 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
462 struct server_id src
,
465 struct share_mode_entry msg
;
468 bool break_to_level2
= False
;
471 if (data
->data
== NULL
) {
472 DEBUG(0, ("Got NULL buffer\n"));
476 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
477 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
481 /* De-linearize incoming message. */
482 message_to_share_mode_entry(&msg
, (char *)data
->data
);
484 DEBUG(10, ("Got oplock break message from pid %s: %s/%lu\n",
485 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
488 fsp
= initial_break_processing(msg
.id
, msg
.share_file_id
);
491 /* a We hit race here. Break messages are sent, and before we
492 * get to process this message, we have closed the file. Reply
493 * with 'ok, oplock broken' */
494 DEBUG(3, ("Did not find fsp\n"));
496 /* We just send the same message back. */
497 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
499 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
503 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
504 /* Remember we have to inform the requesting PID when the
507 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
508 &fsp
->pending_break_messages
,
509 &fsp
->num_pending_break_messages
);
513 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
514 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
515 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
516 file_id_string_tos(&fsp
->file_id
),
518 /* We just send the same message back. */
519 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
521 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
525 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
526 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
527 !(koplocks
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) &&
528 lp_level2_oplocks(SNUM(fsp
->conn
))) {
529 break_to_level2
= True
;
532 break_msg
= new_break_smb_message(NULL
, fsp
, break_to_level2
?
533 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
534 if (break_msg
== NULL
) {
535 exit_server("Could not talloc break_msg\n");
538 /* Need to wait before sending a break message if we sent ourselves this message. */
539 if (procid_is_me(&src
)) {
540 wait_before_sending_break();
543 /* Save the server smb signing state. */
544 sign_state
= srv_oplock_set_signing(False
);
547 if (!srv_send_smb(smbd_server_fd(),
549 IS_CONN_ENCRYPTED(fsp
->conn
),
551 exit_server_cleanly("oplock_break: srv_send_smb failed.");
554 /* Restore the sign state to what it was. */
555 srv_oplock_set_signing(sign_state
);
557 TALLOC_FREE(break_msg
);
559 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
562 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
563 &fsp
->pending_break_messages
,
564 &fsp
->num_pending_break_messages
);
566 add_oplock_timeout_handler(fsp
);
569 /*******************************************************************
570 This handles the kernel oplock break message.
571 *******************************************************************/
573 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
576 struct server_id src
,
580 unsigned long file_id
;
585 if (data
->data
== NULL
) {
586 DEBUG(0, ("Got NULL buffer\n"));
590 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
591 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
595 /* Pull the data from the message. */
596 pull_file_id_24((char *)data
->data
, &id
);
597 file_id
= (unsigned long)IVAL(data
->data
, 24);
599 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
600 procid_str(debug_ctx(), &src
), file_id_string_tos(&id
),
601 (unsigned int)file_id
));
603 fsp
= initial_break_processing(id
, file_id
);
606 DEBUG(3, ("Got a kernel oplock break message for a file "
607 "I don't know about\n"));
611 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
612 /* This is ok, kernel oplocks come in completely async */
613 DEBUG(3, ("Got a kernel oplock request while waiting for a "
618 break_msg
= new_break_smb_message(NULL
, fsp
, OPLOCKLEVEL_NONE
);
619 if (break_msg
== NULL
) {
620 exit_server("Could not talloc break_msg\n");
623 /* Save the server smb signing state. */
624 sign_state
= srv_oplock_set_signing(False
);
627 if (!srv_send_smb(smbd_server_fd(),
629 IS_CONN_ENCRYPTED(fsp
->conn
),
631 exit_server_cleanly("oplock_break: srv_send_smb failed.");
634 /* Restore the sign state to what it was. */
635 srv_oplock_set_signing(sign_state
);
637 TALLOC_FREE(break_msg
);
639 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
641 add_oplock_timeout_handler(fsp
);
644 void reply_to_oplock_break_requests(files_struct
*fsp
)
649 * If kernel oplocks already notifies smbds when oplocks are
650 * broken/removed, just return.
653 (koplocks
->flags
& KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION
)) {
657 for (i
=0; i
<fsp
->num_pending_break_messages
; i
++) {
658 struct share_mode_entry
*e
= &fsp
->pending_break_messages
[i
];
659 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
661 share_mode_entry_to_message(msg
, e
);
663 messaging_send_buf(smbd_messaging_context(), e
->pid
,
664 MSG_SMB_BREAK_RESPONSE
,
666 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
669 SAFE_FREE(fsp
->pending_break_messages
);
670 fsp
->num_pending_break_messages
= 0;
671 if (fsp
->oplock_timeout
!= NULL
) {
672 /* Remove the timed event handler. */
673 TALLOC_FREE(fsp
->oplock_timeout
);
674 fsp
->oplock_timeout
= NULL
;
679 static void process_oplock_break_response(struct messaging_context
*msg_ctx
,
682 struct server_id src
,
685 struct share_mode_entry msg
;
687 if (data
->data
== NULL
) {
688 DEBUG(0, ("Got NULL buffer\n"));
692 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
693 DEBUG(0, ("Got invalid msg len %u\n",
694 (unsigned int)data
->length
));
698 /* De-linearize incoming message. */
699 message_to_share_mode_entry(&msg
, (char *)data
->data
);
701 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %u\n",
702 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
703 msg
.share_file_id
, (unsigned int)msg
.op_mid
));
705 /* Here's the hack from open.c, store the mid in the 'port' field */
706 schedule_deferred_open_smb_message(msg
.op_mid
);
709 static void process_open_retry_message(struct messaging_context
*msg_ctx
,
712 struct server_id src
,
715 struct share_mode_entry msg
;
717 if (data
->data
== NULL
) {
718 DEBUG(0, ("Got NULL buffer\n"));
722 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
723 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
727 /* De-linearize incoming message. */
728 message_to_share_mode_entry(&msg
, (char *)data
->data
);
730 DEBUG(10, ("Got open retry msg from pid %s: %s mid %u\n",
731 procid_str(debug_ctx(), &src
), file_id_string_tos(&msg
.id
),
732 (unsigned int)msg
.op_mid
));
734 schedule_deferred_open_smb_message(msg
.op_mid
);
737 /****************************************************************************
738 This function is called on any file modification or lock request. If a file
739 is level 2 oplocked then it must tell all other level 2 holders to break to
741 ****************************************************************************/
743 static void contend_level2_oplocks_begin_default(files_struct
*fsp
,
744 enum level2_contention_type type
)
747 struct share_mode_lock
*lck
;
750 * If this file is level II oplocked then we need
751 * to grab the shared memory lock and inform all
752 * other files with a level II lock that they need
753 * to flush their read caches. We keep the lock over
754 * the shared memory area whilst doing this.
757 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
760 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
763 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
764 "share mode entry for file %s.\n", fsp
->fsp_name
));
768 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
769 lck
->num_share_modes
));
771 for(i
= 0; i
< lck
->num_share_modes
; i
++) {
772 struct share_mode_entry
*share_entry
= &lck
->share_modes
[i
];
773 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
775 if (!is_valid_share_mode_entry(share_entry
)) {
780 * As there could have been multiple writes waiting at the
781 * lock_share_entry gate we may not be the first to
782 * enter. Hence the state of the op_types in the share mode
783 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
784 * oplock. It will do no harm to re-send break messages to
785 * those smbd's that are still waiting their turn to remove
786 * their LEVEL_II state, and also no harm to ignore existing
787 * NO_OPLOCK states. JRA.
790 DEBUG(10,("release_level_2_oplocks_on_change: "
791 "share_entry[%i]->op_type == %d\n",
792 i
, share_entry
->op_type
));
794 if (share_entry
->op_type
== NO_OPLOCK
) {
799 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
800 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
801 "share mode entry %d is an exlusive "
807 share_mode_entry_to_message(msg
, share_entry
);
810 * Deal with a race condition when breaking level2
811 * oplocks. Don't send all the messages and release
812 * the lock, this allows someone else to come in and
813 * get a level2 lock before any of the messages are
814 * processed, and thus miss getting a break message.
815 * Ensure at least one entry (the one we're breaking)
816 * is processed immediately under the lock and becomes
817 * set as NO_OPLOCK to stop any waiter getting a level2.
821 if (procid_is_me(&share_entry
->pid
)) {
822 wait_before_sending_break();
823 break_level2_to_none_async(fsp
);
825 messaging_send_buf(smbd_messaging_context(),
827 MSG_SMB_ASYNC_LEVEL2_BREAK
,
829 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
833 /* We let the message receivers handle removing the oplock state
834 in the share mode lock db. */
839 void contend_level2_oplocks_begin(files_struct
*fsp
,
840 enum level2_contention_type type
)
842 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_begin
) {
843 koplocks
->ops
->contend_level2_oplocks_begin(fsp
, type
);
847 contend_level2_oplocks_begin_default(fsp
, type
);
850 void contend_level2_oplocks_end(files_struct
*fsp
,
851 enum level2_contention_type type
)
853 /* Only kernel oplocks implement this so far */
854 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_end
) {
855 koplocks
->ops
->contend_level2_oplocks_end(fsp
, type
);
859 /****************************************************************************
860 Linearize a share mode entry struct to an internal oplock break message.
861 ****************************************************************************/
863 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
865 SIVAL(msg
,0,(uint32
)e
->pid
.pid
);
866 SSVAL(msg
,4,e
->op_mid
);
867 SSVAL(msg
,6,e
->op_type
);
868 SIVAL(msg
,8,e
->access_mask
);
869 SIVAL(msg
,12,e
->share_access
);
870 SIVAL(msg
,16,e
->private_options
);
871 SIVAL(msg
,20,(uint32
)e
->time
.tv_sec
);
872 SIVAL(msg
,24,(uint32
)e
->time
.tv_usec
);
873 push_file_id_24(msg
+28, &e
->id
);
874 SIVAL(msg
,52,e
->share_file_id
);
875 SIVAL(msg
,56,e
->uid
);
876 SSVAL(msg
,60,e
->flags
);
877 #ifdef CLUSTER_SUPPORT
878 SIVAL(msg
,62,e
->pid
.vnn
);
882 /****************************************************************************
883 De-linearize an internal oplock break message to a share mode entry struct.
884 ****************************************************************************/
886 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
888 e
->pid
.pid
= (pid_t
)IVAL(msg
,0);
889 e
->op_mid
= SVAL(msg
,4);
890 e
->op_type
= SVAL(msg
,6);
891 e
->access_mask
= IVAL(msg
,8);
892 e
->share_access
= IVAL(msg
,12);
893 e
->private_options
= IVAL(msg
,16);
894 e
->time
.tv_sec
= (time_t)IVAL(msg
,20);
895 e
->time
.tv_usec
= (int)IVAL(msg
,24);
896 pull_file_id_24(msg
+28, &e
->id
);
897 e
->share_file_id
= (unsigned long)IVAL(msg
,52);
898 e
->uid
= (uint32
)IVAL(msg
,56);
899 e
->flags
= (uint16
)SVAL(msg
,60);
900 #ifdef CLUSTER_SUPPORT
901 e
->pid
.vnn
= IVAL(msg
,62);
905 /****************************************************************************
906 Setup oplocks for this process.
907 ****************************************************************************/
909 bool init_oplocks(struct messaging_context
*msg_ctx
)
911 DEBUG(3,("init_oplocks: initializing messages.\n"));
913 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_REQUEST
,
914 process_oplock_break_message
);
915 messaging_register(msg_ctx
, NULL
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
916 process_oplock_async_level2_break_message
);
917 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_RESPONSE
,
918 process_oplock_break_response
);
919 messaging_register(msg_ctx
, NULL
, MSG_SMB_KERNEL_BREAK
,
920 process_kernel_oplock_break
);
921 messaging_register(msg_ctx
, NULL
, MSG_SMB_OPEN_RETRY
,
922 process_open_retry_message
);
924 if (lp_kernel_oplocks()) {
925 #if HAVE_KERNEL_OPLOCKS_IRIX
926 koplocks
= irix_init_kernel_oplocks(talloc_autofree_context());
927 #elif HAVE_KERNEL_OPLOCKS_LINUX
928 koplocks
= linux_init_kernel_oplocks(talloc_autofree_context());
930 koplocks
= onefs_init_kernel_oplocks(talloc_autofree_context());