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/smbd.h"
25 #include "smbd/globals.h"
27 #include "../librpc/gen_ndr/open_files.h"
30 * helper function used by the kernel oplock backends to post the break message
32 void break_kernel_oplock(struct messaging_context
*msg_ctx
, files_struct
*fsp
)
34 uint8_t msg
[MSG_SMB_KERNEL_BREAK_SIZE
];
36 /* Put the kernel break info into the message. */
37 push_file_id_24((char *)msg
, &fsp
->file_id
);
38 SIVAL(msg
,24,fsp
->fh
->gen_id
);
40 /* Don't need to be root here as we're only ever
41 sending to ourselves. */
43 messaging_send_buf(msg_ctx
, messaging_server_id(msg_ctx
),
45 msg
, MSG_SMB_KERNEL_BREAK_SIZE
);
48 /****************************************************************************
49 Attempt to set an oplock on a file. Succeeds if kernel oplocks are
50 disabled (just sets flags) and no byte-range locks in the file. Returns True
52 ****************************************************************************/
54 NTSTATUS
set_file_oplock(files_struct
*fsp
, int oplock_type
)
56 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
57 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
58 bool use_kernel
= lp_kernel_oplocks(SNUM(fsp
->conn
)) && koplocks
;
60 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
62 !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) {
63 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
64 "don't support them\n"));
65 return NT_STATUS_NOT_SUPPORTED
;
69 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
70 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
72 !koplocks
->ops
->set_oplock(koplocks
, fsp
, oplock_type
))
74 return map_nt_error_from_unix(errno
);
77 fsp
->oplock_type
= oplock_type
;
78 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
79 if (oplock_type
== LEVEL_II_OPLOCK
) {
80 sconn
->oplocks
.level_II_open
++;
81 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
82 sconn
->oplocks
.exclusive_open
++;
85 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
86 "tv_sec = %x, tv_usec = %x\n",
87 fsp_str_dbg(fsp
), file_id_string_tos(&fsp
->file_id
),
88 fsp
->fh
->gen_id
, (int)fsp
->open_time
.tv_sec
,
89 (int)fsp
->open_time
.tv_usec
));
94 /****************************************************************************
95 Attempt to release an oplock on a file. Decrements oplock count.
96 ****************************************************************************/
98 void release_file_oplock(files_struct
*fsp
)
100 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
101 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
103 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
104 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
106 koplocks
->ops
->release_oplock(koplocks
, fsp
, NO_OPLOCK
);
109 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
110 sconn
->oplocks
.level_II_open
--;
111 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
112 sconn
->oplocks
.exclusive_open
--;
115 SMB_ASSERT(sconn
->oplocks
.exclusive_open
>=0);
116 SMB_ASSERT(sconn
->oplocks
.level_II_open
>=0);
118 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
119 /* This doesn't matter for close. */
120 fsp
->oplock_type
= FAKE_LEVEL_II_OPLOCK
;
122 fsp
->oplock_type
= NO_OPLOCK
;
124 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
126 flush_write_cache(fsp
, OPLOCK_RELEASE_FLUSH
);
127 delete_write_cache(fsp
);
129 TALLOC_FREE(fsp
->oplock_timeout
);
132 /****************************************************************************
133 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
134 ****************************************************************************/
136 static void downgrade_file_oplock(files_struct
*fsp
)
138 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
139 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
141 if (!EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
142 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
147 koplocks
->ops
->release_oplock(koplocks
, fsp
, LEVEL_II_OPLOCK
);
149 fsp
->oplock_type
= LEVEL_II_OPLOCK
;
150 sconn
->oplocks
.exclusive_open
--;
151 sconn
->oplocks
.level_II_open
++;
152 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
154 TALLOC_FREE(fsp
->oplock_timeout
);
157 /****************************************************************************
158 Remove a file oplock. Copes with level II and exclusive.
159 Locks then unlocks the share mode lock. Client can decide to go directly
160 to none even if a "break-to-level II" was sent.
161 ****************************************************************************/
163 bool remove_oplock(files_struct
*fsp
)
166 struct share_mode_lock
*lck
;
168 /* Remove the oplock flag from the sharemode. */
169 lck
= get_existing_share_mode_lock(talloc_tos(), fsp
->file_id
);
171 DEBUG(0,("remove_oplock: failed to lock share entry for "
172 "file %s\n", fsp_str_dbg(fsp
)));
175 ret
= remove_share_oplock(lck
, fsp
);
177 DEBUG(0,("remove_oplock: failed to remove share oplock for "
179 fsp_str_dbg(fsp
), fsp_fnum_dbg(fsp
),
180 file_id_string_tos(&fsp
->file_id
)));
182 release_file_oplock(fsp
);
188 * Deal with a reply when a break-to-level II was sent.
190 bool downgrade_oplock(files_struct
*fsp
)
193 struct share_mode_lock
*lck
;
195 lck
= get_existing_share_mode_lock(talloc_tos(), fsp
->file_id
);
197 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
198 "file %s\n", fsp_str_dbg(fsp
)));
201 ret
= downgrade_share_oplock(lck
, fsp
);
203 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
204 "for file %s, %s, file_id %s\n",
205 fsp_str_dbg(fsp
), fsp_fnum_dbg(fsp
),
206 file_id_string_tos(&fsp
->file_id
)));
209 downgrade_file_oplock(fsp
);
215 * Some kernel oplock implementations handle the notification themselves.
217 bool should_notify_deferred_opens(struct smbd_server_connection
*sconn
)
219 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
221 (koplocks
->flags
& KOPLOCKS_DEFERRED_OPEN_NOTIFICATION
));
224 /****************************************************************************
225 Set up an oplock break message.
226 ****************************************************************************/
228 static char *new_break_message_smb1(TALLOC_CTX
*mem_ctx
,
229 files_struct
*fsp
, int cmd
)
231 char *result
= talloc_array(mem_ctx
, char, smb_size
+ 8*2 + 0);
233 if (result
== NULL
) {
234 DEBUG(0, ("talloc failed\n"));
238 memset(result
,'\0',smb_size
);
239 srv_set_message(result
,8,0,true);
240 SCVAL(result
,smb_com
,SMBlockingX
);
241 SSVAL(result
,smb_tid
,fsp
->conn
->cnum
);
242 SSVAL(result
,smb_pid
,0xFFFF);
243 SSVAL(result
,smb_uid
,0);
244 SSVAL(result
,smb_mid
,0xFFFF);
245 SCVAL(result
,smb_vwv0
,0xFF);
246 SSVAL(result
,smb_vwv2
,fsp
->fnum
);
247 SCVAL(result
,smb_vwv3
,LOCKING_ANDX_OPLOCK_RELEASE
);
248 SCVAL(result
,smb_vwv3
+1,cmd
);
252 /****************************************************************************
253 Function to do the waiting before sending a local break.
254 ****************************************************************************/
256 static void wait_before_sending_break(void)
258 long wait_time
= (long)lp_oplock_break_wait_time();
261 smb_msleep(wait_time
);
265 /****************************************************************************
266 Ensure that we have a valid oplock.
267 ****************************************************************************/
269 static files_struct
*initial_break_processing(
270 struct smbd_server_connection
*sconn
, struct file_id id
,
271 unsigned long file_id
)
273 files_struct
*fsp
= NULL
;
275 if( DEBUGLVL( 3 ) ) {
276 dbgtext( "initial_break_processing: called for %s/%u\n",
277 file_id_string_tos(&id
), (int)file_id
);
278 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
279 sconn
->oplocks
.exclusive_open
,
280 sconn
->oplocks
.level_II_open
);
284 * We need to search the file open table for the
285 * entry containing this dev and inode, and ensure
286 * we have an oplock on it.
289 fsp
= file_find_dif(sconn
, id
, file_id
);
292 /* The file could have been closed in the meantime - return success. */
293 if( DEBUGLVL( 3 ) ) {
294 dbgtext( "initial_break_processing: cannot find open file with " );
295 dbgtext( "file_id %s gen_id = %lu, ", file_id_string_tos(&id
), file_id
);
296 dbgtext( "allowing break to succeed.\n" );
301 /* Ensure we have an oplock on the file */
304 * There is a potential race condition in that an oplock could
305 * have been broken due to another udp request, and yet there are
306 * still oplock break messages being sent in the udp message
307 * queue for this file. So return true if we don't have an oplock,
308 * as we may have just freed it.
311 if(fsp
->oplock_type
== NO_OPLOCK
) {
312 if( DEBUGLVL( 3 ) ) {
313 dbgtext( "initial_break_processing: file %s ",
315 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
316 file_id_string_tos(&id
), fsp
->fh
->gen_id
);
317 dbgtext( "Allowing break to succeed regardless.\n" );
325 static void oplock_timeout_handler(struct tevent_context
*ctx
,
326 struct tevent_timer
*te
,
330 files_struct
*fsp
= (files_struct
*)private_data
;
332 /* Remove the timed event handler. */
333 TALLOC_FREE(fsp
->oplock_timeout
);
334 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
339 /*******************************************************************
340 Add a timeout handler waiting for the client reply.
341 *******************************************************************/
343 static void add_oplock_timeout_handler(files_struct
*fsp
)
345 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
346 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
349 * If kernel oplocks already notifies smbds when an oplock break times
353 (koplocks
->flags
& KOPLOCKS_TIMEOUT_NOTIFICATION
)) {
357 if (fsp
->oplock_timeout
!= NULL
) {
358 DEBUG(0, ("Logic problem -- have an oplock event hanging "
362 fsp
->oplock_timeout
=
363 tevent_add_timer(fsp
->conn
->sconn
->ev_ctx
, fsp
,
364 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT
, 0),
365 oplock_timeout_handler
, fsp
);
367 if (fsp
->oplock_timeout
== NULL
) {
368 DEBUG(0, ("Could not add oplock timeout handler\n"));
372 static void send_break_message_smb1(files_struct
*fsp
, int level
)
374 char *break_msg
= new_break_message_smb1(talloc_tos(),
377 if (break_msg
== NULL
) {
378 exit_server("Could not talloc break_msg\n");
382 if (!srv_send_smb(fsp
->conn
->sconn
,
384 IS_CONN_ENCRYPTED(fsp
->conn
),
386 exit_server_cleanly("send_break_message_smb1: "
387 "srv_send_smb failed.");
390 TALLOC_FREE(break_msg
);
393 void break_level2_to_none_async(files_struct
*fsp
)
395 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
397 if (fsp
->oplock_type
== NO_OPLOCK
) {
398 /* We already got a "break to none" message and we've handled
399 * it. just ignore. */
400 DEBUG(3, ("process_oplock_async_level2_break_message: already "
401 "broken to none, ignoring.\n"));
405 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
406 /* Don't tell the client, just downgrade. */
407 DEBUG(3, ("process_oplock_async_level2_break_message: "
408 "downgrading fake level 2 oplock.\n"));
413 /* Ensure we're really at level2 state. */
414 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
416 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
417 "to none message for %s, file %s\n", fsp_fnum_dbg(fsp
),
420 /* Now send a break to none message to our client. */
421 if (sconn
->using_smb2
) {
422 send_break_message_smb2(fsp
, OPLOCKLEVEL_NONE
);
424 send_break_message_smb1(fsp
, OPLOCKLEVEL_NONE
);
427 /* Async level2 request, don't send a reply, just remove the oplock. */
431 /*******************************************************************
432 This handles the case of a write triggering a break to none
433 message on a level2 oplock.
434 When we get this message we may be in any of three states :
435 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
436 the client for LEVEL2.
437 *******************************************************************/
439 static void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
442 struct server_id src
,
445 struct share_mode_entry msg
;
447 struct smbd_server_connection
*sconn
=
448 talloc_get_type_abort(private_data
,
449 struct smbd_server_connection
);
451 if (data
->data
== NULL
) {
452 DEBUG(0, ("Got NULL buffer\n"));
456 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
457 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
461 /* De-linearize incoming message. */
462 message_to_share_mode_entry(&msg
, (char *)data
->data
);
464 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
465 "%s/%llu\n", server_id_str(talloc_tos(), &src
),
466 file_id_string_tos(&msg
.id
),
467 (unsigned long long)msg
.share_file_id
));
469 fsp
= initial_break_processing(sconn
, msg
.id
, msg
.share_file_id
);
472 /* We hit a race here. Break messages are sent, and before we
473 * get to process this message, we have closed the file.
474 * No need to reply as this is an async message. */
475 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
479 break_level2_to_none_async(fsp
);
482 /*******************************************************************
483 This handles the generic oplock break message from another smbd.
484 *******************************************************************/
486 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
489 struct server_id src
,
492 struct share_mode_entry msg
;
494 bool break_to_level2
= False
;
496 struct smbd_server_connection
*sconn
=
497 talloc_get_type_abort(private_data
,
498 struct smbd_server_connection
);
499 struct server_id self
= messaging_server_id(sconn
->msg_ctx
);
500 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
502 if (data
->data
== NULL
) {
503 DEBUG(0, ("Got NULL buffer\n"));
507 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
508 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
512 /* De-linearize incoming message. */
513 message_to_share_mode_entry(&msg
, (char *)data
->data
);
515 DEBUG(10, ("Got oplock break message from pid %s: %s/%llu\n",
516 server_id_str(talloc_tos(), &src
),
517 file_id_string_tos(&msg
.id
),
518 (unsigned long long)msg
.share_file_id
));
520 fsp
= initial_break_processing(sconn
, msg
.id
, msg
.share_file_id
);
523 /* We hit a race here. Break messages are sent, and before we
524 * get to process this message, we have closed the file. */
525 DEBUG(3, ("Did not find fsp\n"));
529 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
531 * Nothing to do anymore
536 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
537 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
538 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
539 file_id_string_tos(&fsp
->file_id
),
544 use_kernel
= lp_kernel_oplocks(SNUM(fsp
->conn
)) && koplocks
;
546 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
547 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
548 !(use_kernel
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) &&
549 lp_level2_oplocks(SNUM(fsp
->conn
))) {
550 break_to_level2
= True
;
553 /* Need to wait before sending a break
554 message if we sent ourselves this message. */
555 if (serverid_equal(&self
, &src
)) {
556 wait_before_sending_break();
559 if (sconn
->using_smb2
) {
560 send_break_message_smb2(fsp
, break_to_level2
?
561 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
563 send_break_message_smb1(fsp
, break_to_level2
?
564 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
567 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
569 add_oplock_timeout_handler(fsp
);
572 /*******************************************************************
573 This handles the kernel oplock break message.
574 *******************************************************************/
576 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
579 struct server_id src
,
583 unsigned long file_id
;
585 struct smbd_server_connection
*sconn
=
586 talloc_get_type_abort(private_data
,
587 struct smbd_server_connection
);
589 if (data
->data
== NULL
) {
590 DEBUG(0, ("Got NULL buffer\n"));
594 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
595 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
599 /* Pull the data from the message. */
600 pull_file_id_24((char *)data
->data
, &id
);
601 file_id
= (unsigned long)IVAL(data
->data
, 24);
603 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
604 server_id_str(talloc_tos(), &src
), file_id_string_tos(&id
),
605 (unsigned int)file_id
));
607 fsp
= initial_break_processing(sconn
, id
, file_id
);
610 DEBUG(3, ("Got a kernel oplock break message for a file "
611 "I don't know about\n"));
615 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
616 /* This is ok, kernel oplocks come in completely async */
617 DEBUG(3, ("Got a kernel oplock request while waiting for a "
622 if (sconn
->using_smb2
) {
623 send_break_message_smb2(fsp
, OPLOCKLEVEL_NONE
);
625 send_break_message_smb1(fsp
, OPLOCKLEVEL_NONE
);
628 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
630 add_oplock_timeout_handler(fsp
);
633 struct break_to_none_state
{
634 struct smbd_server_connection
*sconn
;
637 static void do_break_to_none(struct tevent_req
*req
);
639 /****************************************************************************
640 This function is called on any file modification or lock request. If a file
641 is level 2 oplocked then it must tell all other level 2 holders to break to
643 ****************************************************************************/
645 static void contend_level2_oplocks_begin_default(files_struct
*fsp
,
646 enum level2_contention_type type
)
648 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
649 struct tevent_req
*req
;
650 struct break_to_none_state
*state
;
653 * If this file is level II oplocked then we need
654 * to grab the shared memory lock and inform all
655 * other files with a level II lock that they need
656 * to flush their read caches. We keep the lock over
657 * the shared memory area whilst doing this.
660 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
664 * When we get here we might have a brlock entry locked. Also
665 * locking the share mode entry would violate the locking
666 * order. Breaking level2 oplocks to none is asynchronous
667 * anyway, so we postpone this into an immediate timed event.
670 state
= talloc(sconn
, struct break_to_none_state
);
672 DEBUG(1, ("talloc failed\n"));
675 state
->sconn
= sconn
;
676 state
->id
= fsp
->file_id
;
678 req
= tevent_wakeup_send(state
, sconn
->ev_ctx
, timeval_set(0, 0));
680 DEBUG(1, ("tevent_wakeup_send failed\n"));
684 tevent_req_set_callback(req
, do_break_to_none
, state
);
688 static void do_break_to_none(struct tevent_req
*req
)
690 struct break_to_none_state
*state
= tevent_req_callback_data(
691 req
, struct break_to_none_state
);
692 struct server_id self
= messaging_server_id(state
->sconn
->msg_ctx
);
695 struct share_mode_lock
*lck
;
697 ret
= tevent_wakeup_recv(req
);
700 DEBUG(1, ("tevent_wakeup_recv failed\n"));
703 lck
= get_existing_share_mode_lock(talloc_tos(), state
->id
);
705 DEBUG(1, ("release_level_2_oplocks_on_change: failed to lock "
706 "share mode entry for file %s.\n",
707 file_id_string_tos(&state
->id
)));
711 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
712 lck
->data
->num_share_modes
));
714 for(i
= 0; i
< lck
->data
->num_share_modes
; i
++) {
715 struct share_mode_entry
*share_entry
= &lck
->data
->share_modes
[i
];
716 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
718 if (!is_valid_share_mode_entry(share_entry
)) {
723 * As there could have been multiple writes waiting at the
724 * lock_share_entry gate we may not be the first to
725 * enter. Hence the state of the op_types in the share mode
726 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
727 * oplock. It will do no harm to re-send break messages to
728 * those smbd's that are still waiting their turn to remove
729 * their LEVEL_II state, and also no harm to ignore existing
730 * NO_OPLOCK states. JRA.
733 DEBUG(10,("release_level_2_oplocks_on_change: "
734 "share_entry[%i]->op_type == %d\n",
735 i
, share_entry
->op_type
));
737 if (share_entry
->op_type
== NO_OPLOCK
) {
742 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
743 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
744 "share mode entry %d is an exlusive "
750 share_mode_entry_to_message(msg
, share_entry
);
753 * Deal with a race condition when breaking level2
754 * oplocks. Don't send all the messages and release
755 * the lock, this allows someone else to come in and
756 * get a level2 lock before any of the messages are
757 * processed, and thus miss getting a break message.
758 * Ensure at least one entry (the one we're breaking)
759 * is processed immediately under the lock and becomes
760 * set as NO_OPLOCK to stop any waiter getting a level2.
764 if (serverid_equal(&self
, &share_entry
->pid
)) {
765 struct files_struct
*cur_fsp
=
766 initial_break_processing(state
->sconn
,
768 share_entry
->share_file_id
);
769 wait_before_sending_break();
770 if (cur_fsp
!= NULL
) {
771 break_level2_to_none_async(cur_fsp
);
773 DEBUG(3, ("release_level_2_oplocks_on_change: "
774 "Did not find fsp, ignoring\n"));
777 messaging_send_buf(state
->sconn
->msg_ctx
,
779 MSG_SMB_ASYNC_LEVEL2_BREAK
,
781 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
785 /* We let the message receivers handle removing the oplock state
786 in the share mode lock db. */
794 void smbd_contend_level2_oplocks_begin(files_struct
*fsp
,
795 enum level2_contention_type type
)
797 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
798 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
800 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_begin
) {
801 koplocks
->ops
->contend_level2_oplocks_begin(fsp
, type
);
805 contend_level2_oplocks_begin_default(fsp
, type
);
808 void smbd_contend_level2_oplocks_end(files_struct
*fsp
,
809 enum level2_contention_type type
)
811 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
812 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
814 /* Only kernel oplocks implement this so far */
815 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_end
) {
816 koplocks
->ops
->contend_level2_oplocks_end(fsp
, type
);
820 /****************************************************************************
821 Linearize a share mode entry struct to an internal oplock break message.
822 ****************************************************************************/
824 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
826 SIVAL(msg
,OP_BREAK_MSG_PID_OFFSET
,(uint32
)e
->pid
.pid
);
827 SBVAL(msg
,OP_BREAK_MSG_MID_OFFSET
,e
->op_mid
);
828 SSVAL(msg
,OP_BREAK_MSG_OP_TYPE_OFFSET
,e
->op_type
);
829 SIVAL(msg
,OP_BREAK_MSG_ACCESS_MASK_OFFSET
,e
->access_mask
);
830 SIVAL(msg
,OP_BREAK_MSG_SHARE_ACCESS_OFFSET
,e
->share_access
);
831 SIVAL(msg
,OP_BREAK_MSG_PRIV_OFFSET
,e
->private_options
);
832 SIVAL(msg
,OP_BREAK_MSG_TIME_SEC_OFFSET
,(uint32_t)e
->time
.tv_sec
);
833 SIVAL(msg
,OP_BREAK_MSG_TIME_USEC_OFFSET
,(uint32_t)e
->time
.tv_usec
);
834 push_file_id_24(msg
+OP_BREAK_MSG_DEV_OFFSET
, &e
->id
);
835 SIVAL(msg
,OP_BREAK_MSG_FILE_ID_OFFSET
,e
->share_file_id
);
836 SIVAL(msg
,OP_BREAK_MSG_UID_OFFSET
,e
->uid
);
837 SSVAL(msg
,OP_BREAK_MSG_FLAGS_OFFSET
,e
->flags
);
838 SIVAL(msg
,OP_BREAK_MSG_NAME_HASH_OFFSET
,e
->name_hash
);
839 SIVAL(msg
,OP_BREAK_MSG_VNN_OFFSET
,e
->pid
.vnn
);
842 /****************************************************************************
843 De-linearize an internal oplock break message to a share mode entry struct.
844 ****************************************************************************/
846 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
848 e
->pid
.pid
= (pid_t
)IVAL(msg
,OP_BREAK_MSG_PID_OFFSET
);
849 e
->op_mid
= BVAL(msg
,OP_BREAK_MSG_MID_OFFSET
);
850 e
->op_type
= SVAL(msg
,OP_BREAK_MSG_OP_TYPE_OFFSET
);
851 e
->access_mask
= IVAL(msg
,OP_BREAK_MSG_ACCESS_MASK_OFFSET
);
852 e
->share_access
= IVAL(msg
,OP_BREAK_MSG_SHARE_ACCESS_OFFSET
);
853 e
->private_options
= IVAL(msg
,OP_BREAK_MSG_PRIV_OFFSET
);
854 e
->time
.tv_sec
= (time_t)IVAL(msg
,OP_BREAK_MSG_TIME_SEC_OFFSET
);
855 e
->time
.tv_usec
= (int)IVAL(msg
,OP_BREAK_MSG_TIME_USEC_OFFSET
);
856 pull_file_id_24(msg
+OP_BREAK_MSG_DEV_OFFSET
, &e
->id
);
857 e
->share_file_id
= (unsigned long)IVAL(msg
,OP_BREAK_MSG_FILE_ID_OFFSET
);
858 e
->uid
= (uint32
)IVAL(msg
,OP_BREAK_MSG_UID_OFFSET
);
859 e
->flags
= (uint16
)SVAL(msg
,OP_BREAK_MSG_FLAGS_OFFSET
);
860 e
->name_hash
= IVAL(msg
,OP_BREAK_MSG_NAME_HASH_OFFSET
);
861 e
->pid
.vnn
= IVAL(msg
,OP_BREAK_MSG_VNN_OFFSET
);
864 /****************************************************************************
865 Setup oplocks for this process.
866 ****************************************************************************/
868 bool init_oplocks(struct smbd_server_connection
*sconn
)
870 DEBUG(3,("init_oplocks: initializing messages.\n"));
872 messaging_register(sconn
->msg_ctx
, sconn
, MSG_SMB_BREAK_REQUEST
,
873 process_oplock_break_message
);
874 messaging_register(sconn
->msg_ctx
, sconn
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
875 process_oplock_async_level2_break_message
);
876 messaging_register(sconn
->msg_ctx
, sconn
, MSG_SMB_KERNEL_BREAK
,
877 process_kernel_oplock_break
);
881 void init_kernel_oplocks(struct smbd_server_connection
*sconn
)
883 struct kernel_oplocks
*koplocks
= sconn
->oplocks
.kernel_ops
;
885 /* only initialize once */
886 if (koplocks
== NULL
) {
887 #if HAVE_KERNEL_OPLOCKS_IRIX
888 koplocks
= irix_init_kernel_oplocks(sconn
);
889 #elif HAVE_KERNEL_OPLOCKS_LINUX
890 koplocks
= linux_init_kernel_oplocks(sconn
);
892 sconn
->oplocks
.kernel_ops
= koplocks
;