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"
25 #include "librpc/gen_ndr/messaging.h"
27 /****************************************************************************
28 Get the number of current exclusive oplocks.
29 ****************************************************************************/
31 int32
get_number_of_exclusive_open_oplocks(void)
33 return exclusive_oplocks_open
;
37 * helper function used by the kernel oplock backends to post the break message
39 void break_kernel_oplock(struct messaging_context
*msg_ctx
, files_struct
*fsp
)
41 uint8_t msg
[MSG_SMB_KERNEL_BREAK_SIZE
];
43 /* Put the kernel break info into the message. */
44 push_file_id_24((char *)msg
, &fsp
->file_id
);
45 SIVAL(msg
,24,fsp
->fh
->gen_id
);
47 /* Don't need to be root here as we're only ever
48 sending to ourselves. */
50 messaging_send_buf(msg_ctx
, messaging_server_id(msg_ctx
),
52 msg
, MSG_SMB_KERNEL_BREAK_SIZE
);
55 /****************************************************************************
56 Attempt to set an oplock on a file. Succeeds if kernel oplocks are
57 disabled (just sets flags) and no byte-range locks in the file. Returns True
59 ****************************************************************************/
61 bool set_file_oplock(files_struct
*fsp
, int oplock_type
)
63 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
65 !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) {
66 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
67 "don't support them\n"));
72 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
73 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
75 !koplocks
->ops
->set_oplock(koplocks
, fsp
, oplock_type
)) {
79 fsp
->oplock_type
= oplock_type
;
80 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
81 if (oplock_type
== LEVEL_II_OPLOCK
) {
82 level_II_oplocks_open
++;
83 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
84 exclusive_oplocks_open
++;
87 DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
88 "tv_sec = %x, tv_usec = %x\n",
89 fsp_str_dbg(fsp
), file_id_string_tos(&fsp
->file_id
),
90 fsp
->fh
->gen_id
, (int)fsp
->open_time
.tv_sec
,
91 (int)fsp
->open_time
.tv_usec
));
96 /****************************************************************************
97 Attempt to release an oplock on a file. Decrements oplock count.
98 ****************************************************************************/
100 void release_file_oplock(files_struct
*fsp
)
102 if ((fsp
->oplock_type
!= NO_OPLOCK
) &&
103 (fsp
->oplock_type
!= FAKE_LEVEL_II_OPLOCK
) &&
105 koplocks
->ops
->release_oplock(koplocks
, fsp
, NO_OPLOCK
);
108 if (fsp
->oplock_type
== LEVEL_II_OPLOCK
) {
109 level_II_oplocks_open
--;
110 } else if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
111 exclusive_oplocks_open
--;
114 SMB_ASSERT(exclusive_oplocks_open
>=0);
115 SMB_ASSERT(level_II_oplocks_open
>=0);
117 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
118 /* This doesn't matter for close. */
119 fsp
->oplock_type
= FAKE_LEVEL_II_OPLOCK
;
121 fsp
->oplock_type
= NO_OPLOCK
;
123 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
125 flush_write_cache(fsp
, OPLOCK_RELEASE_FLUSH
);
126 delete_write_cache(fsp
);
128 TALLOC_FREE(fsp
->oplock_timeout
);
131 /****************************************************************************
132 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
133 ****************************************************************************/
135 static void downgrade_file_oplock(files_struct
*fsp
)
137 if (!EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
138 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
143 koplocks
->ops
->release_oplock(koplocks
, fsp
, LEVEL_II_OPLOCK
);
145 fsp
->oplock_type
= LEVEL_II_OPLOCK
;
146 exclusive_oplocks_open
--;
147 level_II_oplocks_open
++;
148 fsp
->sent_oplock_break
= NO_BREAK_SENT
;
151 /****************************************************************************
152 Remove a file oplock. Copes with level II and exclusive.
153 Locks then unlocks the share mode lock. Client can decide to go directly
154 to none even if a "break-to-level II" was sent.
155 ****************************************************************************/
157 bool remove_oplock(files_struct
*fsp
)
160 struct share_mode_lock
*lck
;
162 /* Remove the oplock flag from the sharemode. */
163 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
166 DEBUG(0,("remove_oplock: failed to lock share entry for "
167 "file %s\n", fsp_str_dbg(fsp
)));
170 ret
= remove_share_oplock(lck
, fsp
);
172 DEBUG(0,("remove_oplock: failed to remove share oplock for "
173 "file %s fnum %d, %s\n",
174 fsp_str_dbg(fsp
), fsp
->fnum
,
175 file_id_string_tos(&fsp
->file_id
)));
177 release_file_oplock(fsp
);
183 * Deal with a reply when a break-to-level II was sent.
185 bool downgrade_oplock(files_struct
*fsp
)
188 struct share_mode_lock
*lck
;
190 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
193 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
194 "file %s\n", fsp_str_dbg(fsp
)));
197 ret
= downgrade_share_oplock(lck
, fsp
);
199 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
200 "for file %s fnum %d, file_id %s\n",
201 fsp_str_dbg(fsp
), fsp
->fnum
,
202 file_id_string_tos(&fsp
->file_id
)));
205 downgrade_file_oplock(fsp
);
211 * Some kernel oplock implementations handle the notification themselves.
213 bool should_notify_deferred_opens()
216 (koplocks
->flags
& KOPLOCKS_DEFERRED_OPEN_NOTIFICATION
));
219 /****************************************************************************
220 Set up an oplock break message.
221 ****************************************************************************/
223 static char *new_break_message_smb1(TALLOC_CTX
*mem_ctx
,
224 files_struct
*fsp
, int cmd
)
226 char *result
= TALLOC_ARRAY(mem_ctx
, char, smb_size
+ 8*2 + 0);
228 if (result
== NULL
) {
229 DEBUG(0, ("talloc failed\n"));
233 memset(result
,'\0',smb_size
);
234 srv_set_message(result
,8,0,true);
235 SCVAL(result
,smb_com
,SMBlockingX
);
236 SSVAL(result
,smb_tid
,fsp
->conn
->cnum
);
237 SSVAL(result
,smb_pid
,0xFFFF);
238 SSVAL(result
,smb_uid
,0);
239 SSVAL(result
,smb_mid
,0xFFFF);
240 SCVAL(result
,smb_vwv0
,0xFF);
241 SSVAL(result
,smb_vwv2
,fsp
->fnum
);
242 SCVAL(result
,smb_vwv3
,LOCKING_ANDX_OPLOCK_RELEASE
);
243 SCVAL(result
,smb_vwv3
+1,cmd
);
247 /****************************************************************************
248 Function to do the waiting before sending a local break.
249 ****************************************************************************/
251 static void wait_before_sending_break(void)
253 long wait_time
= (long)lp_oplock_break_wait_time();
256 smb_msleep(wait_time
);
260 /****************************************************************************
261 Ensure that we have a valid oplock.
262 ****************************************************************************/
264 static files_struct
*initial_break_processing(
265 struct smbd_server_connection
*sconn
, struct file_id id
,
266 unsigned long file_id
)
268 files_struct
*fsp
= NULL
;
270 if( DEBUGLVL( 3 ) ) {
271 dbgtext( "initial_break_processing: called for %s/%u\n",
272 file_id_string_tos(&id
), (int)file_id
);
273 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
274 exclusive_oplocks_open
, level_II_oplocks_open
);
278 * We need to search the file open table for the
279 * entry containing this dev and inode, and ensure
280 * we have an oplock on it.
283 fsp
= file_find_dif(sconn
, id
, file_id
);
286 /* The file could have been closed in the meantime - return success. */
287 if( DEBUGLVL( 3 ) ) {
288 dbgtext( "initial_break_processing: cannot find open file with " );
289 dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id
), file_id
);
290 dbgtext( "allowing break to succeed.\n" );
295 /* Ensure we have an oplock on the file */
298 * There is a potential race condition in that an oplock could
299 * have been broken due to another udp request, and yet there are
300 * still oplock break messages being sent in the udp message
301 * queue for this file. So return true if we don't have an oplock,
302 * as we may have just freed it.
305 if(fsp
->oplock_type
== NO_OPLOCK
) {
306 if( DEBUGLVL( 3 ) ) {
307 dbgtext( "initial_break_processing: file %s ",
309 dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
310 file_id_string_tos(&id
), fsp
->fh
->gen_id
);
311 dbgtext( "Allowing break to succeed regardless.\n" );
319 static void oplock_timeout_handler(struct event_context
*ctx
,
320 struct timed_event
*te
,
324 files_struct
*fsp
= (files_struct
*)private_data
;
326 /* Remove the timed event handler. */
327 TALLOC_FREE(fsp
->oplock_timeout
);
328 DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
331 reply_to_oplock_break_requests(fsp
);
334 /*******************************************************************
335 Add a timeout handler waiting for the client reply.
336 *******************************************************************/
338 static void add_oplock_timeout_handler(files_struct
*fsp
)
341 * If kernel oplocks already notifies smbds when an oplock break times
345 (koplocks
->flags
& KOPLOCKS_TIMEOUT_NOTIFICATION
)) {
349 if (fsp
->oplock_timeout
!= NULL
) {
350 DEBUG(0, ("Logic problem -- have an oplock event hanging "
354 fsp
->oplock_timeout
=
355 event_add_timed(smbd_event_context(), fsp
,
356 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT
, 0),
357 oplock_timeout_handler
, fsp
);
359 if (fsp
->oplock_timeout
== NULL
) {
360 DEBUG(0, ("Could not add oplock timeout handler\n"));
364 static void send_break_message_smb1(files_struct
*fsp
, int level
)
366 char *break_msg
= new_break_message_smb1(talloc_tos(),
369 if (break_msg
== NULL
) {
370 exit_server("Could not talloc break_msg\n");
374 if (!srv_send_smb(fsp
->conn
->sconn
,
376 IS_CONN_ENCRYPTED(fsp
->conn
),
378 exit_server_cleanly("send_break_message_smb1: "
379 "srv_send_smb failed.");
382 TALLOC_FREE(break_msg
);
385 void break_level2_to_none_async(files_struct
*fsp
)
387 struct smbd_server_connection
*sconn
= fsp
->conn
->sconn
;
389 if (fsp
->oplock_type
== NO_OPLOCK
) {
390 /* We already got a "break to none" message and we've handled
391 * it. just ignore. */
392 DEBUG(3, ("process_oplock_async_level2_break_message: already "
393 "broken to none, ignoring.\n"));
397 if (fsp
->oplock_type
== FAKE_LEVEL_II_OPLOCK
) {
398 /* Don't tell the client, just downgrade. */
399 DEBUG(3, ("process_oplock_async_level2_break_message: "
400 "downgrading fake level 2 oplock.\n"));
405 /* Ensure we're really at level2 state. */
406 SMB_ASSERT(fsp
->oplock_type
== LEVEL_II_OPLOCK
);
408 DEBUG(10,("process_oplock_async_level2_break_message: sending break "
409 "to none message for fid %d, file %s\n", fsp
->fnum
,
412 /* Now send a break to none message to our client. */
413 if (sconn
->using_smb2
) {
414 send_break_message_smb2(fsp
, OPLOCKLEVEL_NONE
);
416 send_break_message_smb1(fsp
, OPLOCKLEVEL_NONE
);
419 /* Async level2 request, don't send a reply, just remove the oplock. */
423 /*******************************************************************
424 This handles the case of a write triggering a break to none
425 message on a level2 oplock.
426 When we get this message we may be in any of three states :
427 NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
428 the client for LEVEL2.
429 *******************************************************************/
431 void process_oplock_async_level2_break_message(struct messaging_context
*msg_ctx
,
434 struct server_id src
,
437 struct smbd_server_connection
*sconn
;
438 struct share_mode_entry msg
;
441 if (data
->data
== NULL
) {
442 DEBUG(0, ("Got NULL buffer\n"));
446 sconn
= msg_ctx_to_sconn(msg_ctx
);
448 DEBUG(1, ("could not find sconn\n"));
452 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
453 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
457 /* De-linearize incoming message. */
458 message_to_share_mode_entry(&msg
, (char *)data
->data
);
460 DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
461 "%s/%lu\n", procid_str(talloc_tos(), &src
),
462 file_id_string_tos(&msg
.id
), msg
.share_file_id
));
464 fsp
= initial_break_processing(sconn
, msg
.id
, msg
.share_file_id
);
467 /* We hit a race here. Break messages are sent, and before we
468 * get to process this message, we have closed the file.
469 * No need to reply as this is an async message. */
470 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
474 break_level2_to_none_async(fsp
);
477 /*******************************************************************
478 This handles the generic oplock break message from another smbd.
479 *******************************************************************/
481 static void process_oplock_break_message(struct messaging_context
*msg_ctx
,
484 struct server_id src
,
487 struct smbd_server_connection
*sconn
;
488 struct share_mode_entry msg
;
490 bool break_to_level2
= False
;
492 if (data
->data
== NULL
) {
493 DEBUG(0, ("Got NULL buffer\n"));
497 sconn
= msg_ctx_to_sconn(msg_ctx
);
499 DEBUG(1, ("could not find sconn\n"));
503 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
504 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
508 /* De-linearize incoming message. */
509 message_to_share_mode_entry(&msg
, (char *)data
->data
);
511 DEBUG(10, ("Got oplock break message from pid %s: %s/%lu\n",
512 procid_str(talloc_tos(), &src
), file_id_string_tos(&msg
.id
),
515 fsp
= initial_break_processing(sconn
, msg
.id
, msg
.share_file_id
);
518 /* We hit a race here. Break messages are sent, and before we
519 * get to process this message, we have closed the file. Reply
520 * with 'ok, oplock broken' */
521 DEBUG(3, ("Did not find fsp\n"));
523 /* We just send the same message back. */
524 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
526 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
530 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
531 /* Remember we have to inform the requesting PID when the
534 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
535 &fsp
->pending_break_messages
,
536 &fsp
->num_pending_break_messages
);
540 if (EXCLUSIVE_OPLOCK_TYPE(msg
.op_type
) &&
541 !EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
)) {
542 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
543 file_id_string_tos(&fsp
->file_id
),
545 /* We just send the same message back. */
546 messaging_send_buf(msg_ctx
, src
, MSG_SMB_BREAK_RESPONSE
,
548 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
552 if ((global_client_caps
& CAP_LEVEL_II_OPLOCKS
) &&
553 !(msg
.op_type
& FORCE_OPLOCK_BREAK_TO_NONE
) &&
554 !(koplocks
&& !(koplocks
->flags
& KOPLOCKS_LEVEL2_SUPPORTED
)) &&
555 lp_level2_oplocks(SNUM(fsp
->conn
))) {
556 break_to_level2
= True
;
559 /* Need to wait before sending a break
560 message if we sent ourselves this message. */
561 if (procid_is_me(&src
)) {
562 wait_before_sending_break();
565 if (sconn
->using_smb2
) {
566 send_break_message_smb2(fsp
, break_to_level2
?
567 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
569 send_break_message_smb1(fsp
, break_to_level2
?
570 OPLOCKLEVEL_II
: OPLOCKLEVEL_NONE
);
573 fsp
->sent_oplock_break
= break_to_level2
? LEVEL_II_BREAK_SENT
:BREAK_TO_NONE_SENT
;
576 ADD_TO_ARRAY(NULL
, struct share_mode_entry
, msg
,
577 &fsp
->pending_break_messages
,
578 &fsp
->num_pending_break_messages
);
580 add_oplock_timeout_handler(fsp
);
583 /*******************************************************************
584 This handles the kernel oplock break message.
585 *******************************************************************/
587 static void process_kernel_oplock_break(struct messaging_context
*msg_ctx
,
590 struct server_id src
,
593 struct smbd_server_connection
*sconn
;
595 unsigned long file_id
;
598 if (data
->data
== NULL
) {
599 DEBUG(0, ("Got NULL buffer\n"));
603 if (data
->length
!= MSG_SMB_KERNEL_BREAK_SIZE
) {
604 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
608 sconn
= msg_ctx_to_sconn(msg_ctx
);
610 DEBUG(1, ("could not find sconn\n"));
614 /* Pull the data from the message. */
615 pull_file_id_24((char *)data
->data
, &id
);
616 file_id
= (unsigned long)IVAL(data
->data
, 24);
618 DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
619 procid_str(talloc_tos(), &src
), file_id_string_tos(&id
),
620 (unsigned int)file_id
));
622 fsp
= initial_break_processing(sconn
, id
, file_id
);
625 DEBUG(3, ("Got a kernel oplock break message for a file "
626 "I don't know about\n"));
630 if (fsp
->sent_oplock_break
!= NO_BREAK_SENT
) {
631 /* This is ok, kernel oplocks come in completely async */
632 DEBUG(3, ("Got a kernel oplock request while waiting for a "
637 if (sconn
->using_smb2
) {
638 send_break_message_smb2(fsp
, OPLOCKLEVEL_NONE
);
640 send_break_message_smb1(fsp
, OPLOCKLEVEL_NONE
);
643 fsp
->sent_oplock_break
= BREAK_TO_NONE_SENT
;
645 add_oplock_timeout_handler(fsp
);
648 void reply_to_oplock_break_requests(files_struct
*fsp
)
653 * If kernel oplocks already notifies smbds when oplocks are
654 * broken/removed, just return.
657 (koplocks
->flags
& KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION
)) {
661 for (i
=0; i
<fsp
->num_pending_break_messages
; i
++) {
662 struct share_mode_entry
*e
= &fsp
->pending_break_messages
[i
];
663 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
665 share_mode_entry_to_message(msg
, e
);
667 messaging_send_buf(fsp
->conn
->sconn
->msg_ctx
, e
->pid
,
668 MSG_SMB_BREAK_RESPONSE
,
670 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
673 SAFE_FREE(fsp
->pending_break_messages
);
674 fsp
->num_pending_break_messages
= 0;
675 if (fsp
->oplock_timeout
!= NULL
) {
676 /* Remove the timed event handler. */
677 TALLOC_FREE(fsp
->oplock_timeout
);
678 fsp
->oplock_timeout
= NULL
;
683 static void process_oplock_break_response(struct messaging_context
*msg_ctx
,
686 struct server_id src
,
689 struct share_mode_entry msg
;
691 if (data
->data
== NULL
) {
692 DEBUG(0, ("Got NULL buffer\n"));
696 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
697 DEBUG(0, ("Got invalid msg len %u\n",
698 (unsigned int)data
->length
));
702 /* De-linearize incoming message. */
703 message_to_share_mode_entry(&msg
, (char *)data
->data
);
705 DEBUG(10, ("Got oplock break response from pid %s: %s/%lu mid %llu\n",
706 procid_str(talloc_tos(), &src
), file_id_string_tos(&msg
.id
),
707 msg
.share_file_id
, (unsigned long long)msg
.op_mid
));
709 schedule_deferred_open_message_smb(msg
.op_mid
);
712 static void process_open_retry_message(struct messaging_context
*msg_ctx
,
715 struct server_id src
,
718 struct share_mode_entry msg
;
720 if (data
->data
== NULL
) {
721 DEBUG(0, ("Got NULL buffer\n"));
725 if (data
->length
!= MSG_SMB_SHARE_MODE_ENTRY_SIZE
) {
726 DEBUG(0, ("Got invalid msg len %d\n", (int)data
->length
));
730 /* De-linearize incoming message. */
731 message_to_share_mode_entry(&msg
, (char *)data
->data
);
733 DEBUG(10, ("Got open retry msg from pid %s: %s mid %llu\n",
734 procid_str(talloc_tos(), &src
), file_id_string_tos(&msg
.id
),
735 (unsigned long long)msg
.op_mid
));
737 schedule_deferred_open_message_smb(msg
.op_mid
);
740 /****************************************************************************
741 This function is called on any file modification or lock request. If a file
742 is level 2 oplocked then it must tell all other level 2 holders to break to
744 ****************************************************************************/
746 static void contend_level2_oplocks_begin_default(files_struct
*fsp
,
747 enum level2_contention_type type
)
750 struct share_mode_lock
*lck
;
753 * If this file is level II oplocked then we need
754 * to grab the shared memory lock and inform all
755 * other files with a level II lock that they need
756 * to flush their read caches. We keep the lock over
757 * the shared memory area whilst doing this.
760 if (!LEVEL_II_OPLOCK_TYPE(fsp
->oplock_type
))
763 lck
= get_share_mode_lock(talloc_tos(), fsp
->file_id
, NULL
, NULL
,
766 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
767 "share mode entry for file %s.\n", fsp_str_dbg(fsp
)));
771 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
772 lck
->num_share_modes
));
774 for(i
= 0; i
< lck
->num_share_modes
; i
++) {
775 struct share_mode_entry
*share_entry
= &lck
->share_modes
[i
];
776 char msg
[MSG_SMB_SHARE_MODE_ENTRY_SIZE
];
778 if (!is_valid_share_mode_entry(share_entry
)) {
783 * As there could have been multiple writes waiting at the
784 * lock_share_entry gate we may not be the first to
785 * enter. Hence the state of the op_types in the share mode
786 * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
787 * oplock. It will do no harm to re-send break messages to
788 * those smbd's that are still waiting their turn to remove
789 * their LEVEL_II state, and also no harm to ignore existing
790 * NO_OPLOCK states. JRA.
793 DEBUG(10,("release_level_2_oplocks_on_change: "
794 "share_entry[%i]->op_type == %d\n",
795 i
, share_entry
->op_type
));
797 if (share_entry
->op_type
== NO_OPLOCK
) {
802 if (EXCLUSIVE_OPLOCK_TYPE(share_entry
->op_type
)) {
803 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
804 "share mode entry %d is an exlusive "
810 share_mode_entry_to_message(msg
, share_entry
);
813 * Deal with a race condition when breaking level2
814 * oplocks. Don't send all the messages and release
815 * the lock, this allows someone else to come in and
816 * get a level2 lock before any of the messages are
817 * processed, and thus miss getting a break message.
818 * Ensure at least one entry (the one we're breaking)
819 * is processed immediately under the lock and becomes
820 * set as NO_OPLOCK to stop any waiter getting a level2.
824 if (procid_is_me(&share_entry
->pid
)) {
825 struct files_struct
*cur_fsp
=
826 initial_break_processing(fsp
->conn
->sconn
,
828 share_entry
->share_file_id
);
829 wait_before_sending_break();
830 if (cur_fsp
!= NULL
) {
831 break_level2_to_none_async(cur_fsp
);
833 DEBUG(3, ("release_level_2_oplocks_on_change: "
834 "Did not find fsp, ignoring\n"));
837 messaging_send_buf(fsp
->conn
->sconn
->msg_ctx
,
839 MSG_SMB_ASYNC_LEVEL2_BREAK
,
841 MSG_SMB_SHARE_MODE_ENTRY_SIZE
);
845 /* We let the message receivers handle removing the oplock state
846 in the share mode lock db. */
851 void contend_level2_oplocks_begin(files_struct
*fsp
,
852 enum level2_contention_type type
)
854 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_begin
) {
855 koplocks
->ops
->contend_level2_oplocks_begin(fsp
, type
);
859 contend_level2_oplocks_begin_default(fsp
, type
);
862 void contend_level2_oplocks_end(files_struct
*fsp
,
863 enum level2_contention_type type
)
865 /* Only kernel oplocks implement this so far */
866 if (koplocks
&& koplocks
->ops
->contend_level2_oplocks_end
) {
867 koplocks
->ops
->contend_level2_oplocks_end(fsp
, type
);
871 /****************************************************************************
872 Linearize a share mode entry struct to an internal oplock break message.
873 ****************************************************************************/
875 void share_mode_entry_to_message(char *msg
, const struct share_mode_entry
*e
)
877 SIVAL(msg
,OP_BREAK_MSG_PID_OFFSET
,(uint32
)e
->pid
.pid
);
878 SBVAL(msg
,OP_BREAK_MSG_MID_OFFSET
,e
->op_mid
);
879 SSVAL(msg
,OP_BREAK_MSG_OP_TYPE_OFFSET
,e
->op_type
);
880 SIVAL(msg
,OP_BREAK_MSG_ACCESS_MASK_OFFSET
,e
->access_mask
);
881 SIVAL(msg
,OP_BREAK_MSG_SHARE_ACCESS_OFFSET
,e
->share_access
);
882 SIVAL(msg
,OP_BREAK_MSG_PRIV_OFFSET
,e
->private_options
);
883 SIVAL(msg
,OP_BREAK_MSG_TIME_SEC_OFFSET
,(uint32_t)e
->time
.tv_sec
);
884 SIVAL(msg
,OP_BREAK_MSG_TIME_USEC_OFFSET
,(uint32_t)e
->time
.tv_usec
);
885 push_file_id_24(msg
+OP_BREAK_MSG_DEV_OFFSET
, &e
->id
);
886 SIVAL(msg
,OP_BREAK_MSG_FILE_ID_OFFSET
,e
->share_file_id
);
887 SIVAL(msg
,OP_BREAK_MSG_UID_OFFSET
,e
->uid
);
888 SSVAL(msg
,OP_BREAK_MSG_FLAGS_OFFSET
,e
->flags
);
889 SIVAL(msg
,OP_BREAK_MSG_NAME_HASH_OFFSET
,e
->name_hash
);
890 #ifdef CLUSTER_SUPPORT
891 SIVAL(msg
,OP_BREAK_MSG_VNN_OFFSET
,e
->pid
.vnn
);
895 /****************************************************************************
896 De-linearize an internal oplock break message to a share mode entry struct.
897 ****************************************************************************/
899 void message_to_share_mode_entry(struct share_mode_entry
*e
, char *msg
)
901 e
->pid
.pid
= (pid_t
)IVAL(msg
,OP_BREAK_MSG_PID_OFFSET
);
902 e
->op_mid
= BVAL(msg
,OP_BREAK_MSG_MID_OFFSET
);
903 e
->op_type
= SVAL(msg
,OP_BREAK_MSG_OP_TYPE_OFFSET
);
904 e
->access_mask
= IVAL(msg
,OP_BREAK_MSG_ACCESS_MASK_OFFSET
);
905 e
->share_access
= IVAL(msg
,OP_BREAK_MSG_SHARE_ACCESS_OFFSET
);
906 e
->private_options
= IVAL(msg
,OP_BREAK_MSG_PRIV_OFFSET
);
907 e
->time
.tv_sec
= (time_t)IVAL(msg
,OP_BREAK_MSG_TIME_SEC_OFFSET
);
908 e
->time
.tv_usec
= (int)IVAL(msg
,OP_BREAK_MSG_TIME_USEC_OFFSET
);
909 pull_file_id_24(msg
+OP_BREAK_MSG_DEV_OFFSET
, &e
->id
);
910 e
->share_file_id
= (unsigned long)IVAL(msg
,OP_BREAK_MSG_FILE_ID_OFFSET
);
911 e
->uid
= (uint32
)IVAL(msg
,OP_BREAK_MSG_UID_OFFSET
);
912 e
->flags
= (uint16
)SVAL(msg
,OP_BREAK_MSG_FLAGS_OFFSET
);
913 e
->name_hash
= IVAL(msg
,OP_BREAK_MSG_NAME_HASH_OFFSET
);
914 #ifdef CLUSTER_SUPPORT
915 e
->pid
.vnn
= IVAL(msg
,OP_BREAK_MSG_VNN_OFFSET
);
919 /****************************************************************************
920 Setup oplocks for this process.
921 ****************************************************************************/
923 bool init_oplocks(struct messaging_context
*msg_ctx
)
925 DEBUG(3,("init_oplocks: initializing messages.\n"));
927 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_REQUEST
,
928 process_oplock_break_message
);
929 messaging_register(msg_ctx
, NULL
, MSG_SMB_ASYNC_LEVEL2_BREAK
,
930 process_oplock_async_level2_break_message
);
931 messaging_register(msg_ctx
, NULL
, MSG_SMB_BREAK_RESPONSE
,
932 process_oplock_break_response
);
933 messaging_register(msg_ctx
, NULL
, MSG_SMB_KERNEL_BREAK
,
934 process_kernel_oplock_break
);
935 messaging_register(msg_ctx
, NULL
, MSG_SMB_OPEN_RETRY
,
936 process_open_retry_message
);
938 if (lp_kernel_oplocks()) {
939 #if HAVE_KERNEL_OPLOCKS_IRIX
940 koplocks
= irix_init_kernel_oplocks(NULL
);
941 #elif HAVE_KERNEL_OPLOCKS_LINUX
942 koplocks
= linux_init_kernel_oplocks(NULL
);
944 #error Isilon, please check if the NULL context is okay here. Thanks!
945 koplocks
= onefs_init_kernel_oplocks(NULL
);