summaryrefslogtreecommitdiff
path: root/source3/smbd/oplock.c
blob: d9df308a352671353fe384d5253e934372134b82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   oplock processing
   Copyright (C) Andrew Tridgell 1992-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;

/* Oplock ipc UDP socket. */
int oplock_sock = -1;
uint16 oplock_port = 0;

/* Current number of oplocks we have outstanding. */
int32 global_oplocks_open = 0;
BOOL global_oplock_break = False;


extern int smb_read_error;


/****************************************************************************
  open the oplock IPC socket communication
****************************************************************************/
BOOL open_oplock_ipc(void)
{
  struct sockaddr_in sock_name;
  int len = sizeof(sock_name);

  DEBUG(3,("open_oplock_ipc: opening loopback UDP socket.\n"));

  /* Open a lookback UDP socket on a random port. */
  oplock_sock = open_socket_in(SOCK_DGRAM, 0, 0, htonl(INADDR_LOOPBACK));
  if (oplock_sock == -1)
  {
    DEBUG(0,("open_oplock_ipc: Failed to get local UDP socket for \
address %x. Error was %s\n", htonl(INADDR_LOOPBACK), strerror(errno)));
    oplock_port = 0;
    return(False);
  }

  /* Find out the transient UDP port we have been allocated. */
  if(getsockname(oplock_sock, (struct sockaddr *)&sock_name, &len)<0)
  {
    DEBUG(0,("open_oplock_ipc: Failed to get local UDP port. Error was %s\n",
            strerror(errno)));
    close(oplock_sock);
    oplock_sock = -1;
    oplock_port = 0;
    return False;
  }
  oplock_port = ntohs(sock_name.sin_port);

  DEBUG(3,("open_oplock ipc: pid = %d, oplock_port = %u\n", 
            (int)getpid(), oplock_port));

  return True;
}

/****************************************************************************
  process an oplock break message.
****************************************************************************/
BOOL process_local_message(int sock, char *buffer, int buf_size)
{
  int32 msg_len;
  uint16 from_port;
  char *msg_start;

  msg_len = IVAL(buffer,UDP_CMD_LEN_OFFSET);
  from_port = SVAL(buffer,UDP_CMD_PORT_OFFSET);

  msg_start = &buffer[UDP_CMD_HEADER_LEN];

  DEBUG(5,("process_local_message: Got a message of length %d from port (%d)\n", 
            msg_len, from_port));

  /* Switch on message command - currently OPLOCK_BREAK_CMD is the
     only valid request. */

  switch(SVAL(msg_start,UDP_MESSAGE_CMD_OFFSET))
  {
    case OPLOCK_BREAK_CMD:
      /* Ensure that the msg length is correct. */
      if(msg_len != OPLOCK_BREAK_MSG_LEN)
      {
        DEBUG(0,("process_local_message: incorrect length for OPLOCK_BREAK_CMD (was %d, \
should be %d).\n", msg_len, OPLOCK_BREAK_MSG_LEN));
        return False;
      }
      {
        uint32 remotepid = IVAL(msg_start,OPLOCK_BREAK_PID_OFFSET);
        uint32 dev = IVAL(msg_start,OPLOCK_BREAK_DEV_OFFSET);
        uint32 inode = IVAL(msg_start, OPLOCK_BREAK_INODE_OFFSET);
        struct timeval tval;
        struct sockaddr_in toaddr;

        tval.tv_sec = IVAL(msg_start, OPLOCK_BREAK_SEC_OFFSET);
        tval.tv_usec = IVAL(msg_start, OPLOCK_BREAK_USEC_OFFSET);

        DEBUG(5,("process_local_message: oplock break request from \
pid %d, port %d, dev = %x, inode = %x\n", remotepid, from_port, dev, inode));

        /*
         * If we have no record of any currently open oplocks,
         * it's not an error, as a close command may have
         * just been issued on the file that was oplocked.
         * Just return success in this case.
         */

        if(global_oplocks_open != 0)
        {
          if(oplock_break(dev, inode, &tval) == False)
          {
            DEBUG(0,("process_local_message: oplock break failed - \
not returning udp message.\n"));
            return False;
          }
        }
        else
        {
          DEBUG(3,("process_local_message: oplock break requested with no outstanding \
oplocks. Returning success.\n"));
        }

        /* Send the message back after OR'ing in the 'REPLY' bit. */
        SSVAL(msg_start,UDP_MESSAGE_CMD_OFFSET,OPLOCK_BREAK_CMD | CMD_REPLY);
  
        bzero((char *)&toaddr,sizeof(toaddr));
        toaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        toaddr.sin_port = htons(from_port);
        toaddr.sin_family = AF_INET;

        if(sendto( sock, msg_start, OPLOCK_BREAK_MSG_LEN, 0,
                (struct sockaddr *)&toaddr, sizeof(toaddr)) < 0) 
        {
          DEBUG(0,("process_local_message: sendto process %d failed. Errno was %s\n",
                    remotepid, strerror(errno)));
          return False;
        }

        DEBUG(5,("process_local_message: oplock break reply sent to \
pid %d, port %d, for file dev = %x, inode = %x\n", remotepid, 
                from_port, dev, inode));

      }
      break;
    /* 
     * Keep this as a debug case - eventually we can remove it.
     */
    case 0x8001:
      DEBUG(0,("process_local_message: Received unsolicited break \
reply - dumping info.\n"));

      if(msg_len != OPLOCK_BREAK_MSG_LEN)
      {
        DEBUG(0,("process_local_message: ubr: incorrect length for reply \
(was %d, should be %d).\n", msg_len, OPLOCK_BREAK_MSG_LEN));
        return False;
      }

      {
        uint32 remotepid = IVAL(msg_start,OPLOCK_BREAK_PID_OFFSET);
        uint32 dev = IVAL(msg_start,OPLOCK_BREAK_DEV_OFFSET);
        uint32 inode = IVAL(msg_start, OPLOCK_BREAK_INODE_OFFSET);

        DEBUG(0,("process_local_message: unsolicited oplock break reply from \
pid %d, port %d, dev = %x, inode = %x\n", remotepid, from_port, dev, inode));

       }
       return False;

    default:
      DEBUG(0,("process_local_message: unknown UDP message command code (%x) - ignoring.\n",
                (unsigned int)SVAL(msg_start,0)));
      return False;
  }
  return True;
}

/****************************************************************************
 Process an oplock break directly.
****************************************************************************/
BOOL oplock_break(uint32 dev, uint32 inode, struct timeval *tval)
{
  extern struct current_user current_user;
  extern int Client;
  char *inbuf = NULL;
  char *outbuf = NULL;
  files_struct *fsp = NULL;
  time_t start_time;
  BOOL shutdown_server = False;
  connection_struct *saved_conn;
  int saved_vuid;
  pstring saved_dir; 

  if( DEBUGLVL( 3 ) )
    {
    dbgtext( "oplock_break: called for dev = %x, inode = %x.\n", dev, inode );
    dbgtext( "Current global_oplocks_open = %d\n", global_oplocks_open );
    }

  /* We need to search the file open table for the
     entry containing this dev and inode, and ensure
     we have an oplock on it. */
  fsp = file_find_dit(dev, inode, tval);

  if(fsp == NULL)
  {
    /* The file could have been closed in the meantime - return success. */
    if( DEBUGLVL( 0 ) )
      {
      dbgtext( "oplock_break: cannot find open file with " );
      dbgtext( "dev = %x, inode = %x ", dev, inode);
      dbgtext( "allowing break to succeed.\n" );
      }
    return True;
  }

  /* Ensure we have an oplock on the file */

  /* There is a potential race condition in that an oplock could
     have been broken due to another udp request, and yet there are
     still oplock break messages being sent in the udp message
     queue for this file. So return true if we don't have an oplock,
     as we may have just freed it.
   */

  if(!fsp->granted_oplock)
  {
    if( DEBUGLVL( 0 ) )
      {
      dbgtext( "oplock_break: file %s ", fsp->fsp_name );
      dbgtext( "(dev = %x, inode = %x) has no oplock.\n", dev, inode );
      dbgtext( "Allowing break to succeed regardless.\n" );
      }
    return True;
  }

  /* mark the oplock break as sent - we don't want to send twice! */
  if (fsp->sent_oplock_break)
  {
    if( DEBUGLVL( 0 ) )
      {
      dbgtext( "oplock_break: ERROR: oplock_break already sent for " );
      dbgtext( "file %s ", fsp->fsp_name);
      dbgtext( "(dev = %x, inode = %x)\n", dev, inode );
      }

    /* We have to fail the open here as we cannot send another oplock break on
       this file whilst we are awaiting a response from the client - neither
       can we allow another open to succeed while we are waiting for the
       client.
     */
    return False;
  }

  /* Now comes the horrid part. We must send an oplock break to the client,
     and then process incoming messages until we get a close or oplock release.
     At this point we know we need a new inbuf/outbuf buffer pair.
     We cannot use these staticaly as we may recurse into here due to
     messages crossing on the wire.
   */

  if((inbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN))==NULL)
  {
    DEBUG(0,("oplock_break: malloc fail for input buffer.\n"));
    return False;
  }

  if((outbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN))==NULL)
  {
    DEBUG(0,("oplock_break: malloc fail for output buffer.\n"));
    free(inbuf);
    inbuf = NULL;
    return False;
  }

  /* Prepare the SMBlockingX message. */
  bzero(outbuf,smb_size);
  set_message(outbuf,8,0,True);

  SCVAL(outbuf,smb_com,SMBlockingX);
  SSVAL(outbuf,smb_tid,fsp->conn->cnum);
  SSVAL(outbuf,smb_pid,0xFFFF);
  SSVAL(outbuf,smb_uid,0);
  SSVAL(outbuf,smb_mid,0xFFFF);
  SCVAL(outbuf,smb_vwv0,0xFF);
  SSVAL(outbuf,smb_vwv2,fsp->fnum);
  SCVAL(outbuf,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
  /* Change this when we have level II oplocks. */
  SCVAL(outbuf,smb_vwv3+1,OPLOCKLEVEL_NONE);
 
  send_smb(Client, outbuf);

  /* Remember we just sent an oplock break on this file. */
  fsp->sent_oplock_break = True;

  /* We need this in case a readraw crosses on the wire. */
  global_oplock_break = True;
 
  /* Process incoming messages. */

  /* JRA - If we don't get a break from the client in OPLOCK_BREAK_TIMEOUT
     seconds we should just die.... */

  start_time = time(NULL);

  /*
   * Save the information we need to re-become the
   * user, then unbecome the user whilst we're doing this.
   */
  saved_conn = fsp->conn;
  saved_vuid = current_user.vuid;
  GetWd(saved_dir);
  unbecome_user();
  /* Save the chain fnum. */
  file_chain_save();

  while(OPEN_FSP(fsp) && fsp->granted_oplock)
  {
    if(receive_smb(Client,inbuf,OPLOCK_BREAK_TIMEOUT * 1000) == False)
    {
      /*
       * Die if we got an error.
       */

      if (smb_read_error == READ_EOF)
        DEBUG( 0, ( "oplock_break: end of file from client\n" ) );
 
      if (smb_read_error == READ_ERROR)
        DEBUG( 0, ("oplock_break: receive_smb error (%s)\n", strerror(errno)) );

      if (smb_read_error == READ_TIMEOUT)
        DEBUG( 0, ( "oplock_break: receive_smb timed out after %d seconds.\n",
                     OPLOCK_BREAK_TIMEOUT ) );

      DEBUGADD( 0, ( "oplock_break failed for file %s ", fsp->fsp_name ) );
      DEBUGADD( 0, ( "(dev = %x, inode = %x).\n", dev, inode));
      shutdown_server = True;
      break;
    }

    /*
     * There are certain SMB requests that we shouldn't allow
     * to recurse. opens, renames and deletes are the obvious
     * ones. This is handled in the switch_message() function.
     * If global_oplock_break is set they will push the packet onto
     * the pending smb queue and return -1 (no reply).
     * JRA.
     */

    process_smb(inbuf, outbuf);

    /*
     * Die if we go over the time limit.
     */

    if((time(NULL) - start_time) > OPLOCK_BREAK_TIMEOUT)
    {
      if( DEBUGLVL( 0 ) )
        {
        dbgtext( "oplock_break: no break received from client " );
        dbgtext( "within %d seconds.\n", OPLOCK_BREAK_TIMEOUT );
        dbgtext( "oplock_break failed for file %s ", fsp->fsp_name );
        dbgtext( "(dev = %x, inode = %x).\n", dev, inode );
        }
      shutdown_server = True;
      break;
    }
  }

  /*
   * Go back to being the user who requested the oplock
   * break.
   */
  if(!become_user(saved_conn, saved_vuid))
  {
    DEBUG( 0, ( "oplock_break: unable to re-become user!" ) );
    DEBUGADD( 0, ( "Shutting down server\n" ) );
    close_sockets();
    close(oplock_sock);
    exit_server("unable to re-become user");
  }
  /* Including the directory. */
  ChDir(saved_dir);

  /* Restore the chain fnum. */
  file_chain_restore();

  /* Free the buffers we've been using to recurse. */
  free(inbuf);
  free(outbuf);

  /* We need this in case a readraw crossed on the wire. */
  if(global_oplock_break)
    global_oplock_break = False;

  /*
   * If the client did not respond we must die.
   */

  if(shutdown_server)
  {
    DEBUG( 0, ( "oplock_break: client failure in break - " ) );
    DEBUGADD( 0, ( "shutting down this smbd.\n" ) );
    close_sockets();
    close(oplock_sock);
    exit_server("oplock break failure");
  }

  if(OPEN_FSP(fsp))
  {
    /* The lockingX reply will have removed the oplock flag 
       from the sharemode. */
    /* Paranoia.... */
    fsp->granted_oplock = False;
    fsp->sent_oplock_break = False;
    global_oplocks_open--;
  }

  /* Santity check - remove this later. JRA */
  if(global_oplocks_open < 0)
  {
    DEBUG(0,("oplock_break: global_oplocks_open < 0 (%d). PANIC ERROR\n",
              global_oplocks_open));
    exit_server("oplock_break: global_oplocks_open < 0");
  }

  if( DEBUGLVL( 3 ) )
    {
    dbgtext( "oplock_break: returning success for " );
    dbgtext( "dev = %x, inode = %x.\n", dev, inode );
    dbgtext( "Current global_oplocks_open = %d\n", global_oplocks_open );
    }

  return True;
}

/****************************************************************************
Send an oplock break message to another smbd process. If the oplock is held 
by the local smbd then call the oplock break function directly.
****************************************************************************/

BOOL request_oplock_break(share_mode_entry *share_entry, 
                          uint32 dev, uint32 inode)
{
  char op_break_msg[OPLOCK_BREAK_MSG_LEN];
  struct sockaddr_in addr_out;
  int pid = getpid();
  time_t start_time;
  int time_left;

  if(pid == share_entry->pid)
  {
    /* We are breaking our own oplock, make sure it's us. */
    if(share_entry->op_port != oplock_port)
    {
      DEBUG(0,("request_oplock_break: corrupt share mode entry - pid = %d, port = %d \
should be %d\n", pid, share_entry->op_port, oplock_port));
      return False;
    }

    DEBUG(5,("request_oplock_break: breaking our own oplock\n"));

    /* Call oplock break direct. */
    return oplock_break(dev, inode, &share_entry->time);
  }

  /* We need to send a OPLOCK_BREAK_CMD message to the
     port in the share mode entry. */

  SSVAL(op_break_msg,UDP_MESSAGE_CMD_OFFSET,OPLOCK_BREAK_CMD);
  SIVAL(op_break_msg,OPLOCK_BREAK_PID_OFFSET,pid);
  SIVAL(op_break_msg,OPLOCK_BREAK_DEV_OFFSET,dev);
  SIVAL(op_break_msg,OPLOCK_BREAK_INODE_OFFSET,inode);
  SIVAL(op_break_msg,OPLOCK_BREAK_SEC_OFFSET,(uint32)share_entry->time.tv_sec);
  SIVAL(op_break_msg,OPLOCK_BREAK_USEC_OFFSET,(uint32)share_entry->time.tv_usec);

  /* set the address and port */
  bzero((char *)&addr_out,sizeof(addr_out));
  addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  addr_out.sin_port = htons( share_entry->op_port );
  addr_out.sin_family = AF_INET;
   
  if( DEBUGLVL( 3 ) )
    {
    dbgtext( "request_oplock_break: sending a oplock break message to " );
    dbgtext( "pid %d on port %d ", share_entry->pid, share_entry->op_port );
    dbgtext( "for dev = %x, inode = %x\n", dev, inode );
    }

  if(sendto(oplock_sock,op_break_msg,OPLOCK_BREAK_MSG_LEN,0,
         (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0)
  {
    if( DEBUGLVL( 0 ) )
      {
      dbgtext( "request_oplock_break: failed when sending a oplock " );
      dbgtext( "break message to pid %d ", share_entry->pid );
      dbgtext( "on port %d ", share_entry->op_port );
      dbgtext( "for dev = %x, inode = %x.\n", dev, inode );
      dbgtext( "Error was %s\n", strerror(errno) );
      }
    return False;
  }

  /*
   * Now we must await the oplock broken message coming back
   * from the target smbd process. Timeout if it fails to
   * return in (OPLOCK_BREAK_TIMEOUT + OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR) seconds.
   * While we get messages that aren't ours, loop.
   */

  start_time = time(NULL);
  time_left = OPLOCK_BREAK_TIMEOUT+OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR;

  while(time_left >= 0)
  {
    char op_break_reply[UDP_CMD_HEADER_LEN+OPLOCK_BREAK_MSG_LEN];
    int32 reply_msg_len;
    uint16 reply_from_port;
    char *reply_msg_start;

    if(receive_local_message(oplock_sock, op_break_reply, sizeof(op_break_reply),
               time_left ? time_left * 1000 : 1) == False)
    {
      if(smb_read_error == READ_TIMEOUT)
      {
        if( DEBUGLVL( 0 ) )
          {
          dbgtext( "request_oplock_break: no response received to oplock " );
          dbgtext( "break request to pid %d ", share_entry->pid );
          dbgtext( "on port %d ", share_entry->op_port );
          dbgtext( "for dev = %x, inode = %x\n", dev, inode );
          }
        /*
         * This is a hack to make handling of failing clients more robust.
         * If a oplock break response message is not received in the timeout
         * period we may assume that the smbd servicing that client holding
         * the oplock has died and the client changes were lost anyway, so
         * we should continue to try and open the file.
         */
        break;
      }
      else
        if( DEBUGLVL( 0 ) )
          {
          dbgtext( "request_oplock_break: error in response received " );
          dbgtext( "to oplock break request to pid %d ", share_entry->pid );
          dbgtext( "on port %d ", share_entry->op_port );
          dbgtext( "for dev = %x, inode = %x.\n", dev, inode );
          dbgtext( "Error was (%s).\n", strerror(errno) );
          }
      return False;
    }

    reply_msg_len = IVAL(op_break_reply,UDP_CMD_LEN_OFFSET);
    reply_from_port = SVAL(op_break_reply,UDP_CMD_PORT_OFFSET);

    reply_msg_start = &op_break_reply[UDP_CMD_HEADER_LEN];

    if(reply_msg_len != OPLOCK_BREAK_MSG_LEN)
    {
      /* Ignore it. */
      DEBUG( 0, ( "request_oplock_break: invalid message length received." ) );
      DEBUGADD( 0, ( "  Ignoring.\n" ) );
      continue;
    }

    /*
     * Test to see if this is the reply we are awaiting.
     */

    if((SVAL(reply_msg_start,UDP_MESSAGE_CMD_OFFSET) & CMD_REPLY) &&
       (reply_from_port == share_entry->op_port) && 
       (memcmp(&reply_msg_start[OPLOCK_BREAK_PID_OFFSET], 
               &op_break_msg[OPLOCK_BREAK_PID_OFFSET],
               OPLOCK_BREAK_MSG_LEN - OPLOCK_BREAK_PID_OFFSET) == 0))
    {
      /*
       * This is the reply we've been waiting for.
       */
      break;
    }
    else
    {
      /*
       * This is another message - probably a break request.
       * Process it to prevent potential deadlock.
       * Note that the code in switch_message() prevents
       * us from recursing into here as any SMB requests
       * we might process that would cause another oplock
       * break request to be made will be queued.
       * JRA.
       */

      process_local_message(oplock_sock, op_break_reply, sizeof(op_break_reply));
    }

    time_left -= (time(NULL) - start_time);
  }

  DEBUG(3,("request_oplock_break: broke oplock.\n"));

  return True;
}


/****************************************************************************
  Attempt to break an oplock on a file (if oplocked).
  Returns True if the file was closed as a result of
  the oplock break, False otherwise.
  Used as a last ditch attempt to free a space in the 
  file table when we have run out.
****************************************************************************/
BOOL attempt_close_oplocked_file(files_struct *fsp)
{

  DEBUG(5,("attempt_close_oplocked_file: checking file %s.\n", fsp->fsp_name));

  if (fsp->open && fsp->granted_oplock && !fsp->sent_oplock_break) {

    /* Try and break the oplock. */
    file_fd_struct *fd_ptr = fsp->fd_ptr;
    if(oplock_break( fd_ptr->dev, fd_ptr->inode, &fsp->open_time)) {
      if(!fsp->open) /* Did the oplock break close the file ? */
        return True;
    }
  }

  return False;
}