source/smbd/blocking.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Blocking Locking functions
   4    Copyright (C) Jeremy Allison 1998-2003
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /****************************************************************************
  24  This is the structure to queue to implement blocking locks.
  25  notify. It consists of the requesting SMB and the expiry time.
  26 *****************************************************************************/
  27
  28 typedef struct _blocking_lock_record {
  29         struct _blocking_lock_record *next;
  30         struct _blocking_lock_record *prev;
  31         int com_type;
  32         files_struct *fsp;
  33         time_t expire_time;
  34         int lock_num;
  35         SMB_BIG_UINT offset;
  36         SMB_BIG_UINT count;
  37         uint16 lock_pid;
  38         enum brl_flavour lock_flav;
  39         enum brl_type lock_type;
  40         char *inbuf;
  41         int length;
  42 } blocking_lock_record;
  43
  44 static blocking_lock_record *blocking_lock_queue;
  45
  46 /****************************************************************************
  47  Destructor for the above structure.
  48 ****************************************************************************/
  49
  50 static void free_blocking_lock_record(blocking_lock_record *blr)
  51 {
  52         DLIST_REMOVE(blocking_lock_queue, blr);
  53         SAFE_FREE(blr->inbuf);
  54         SAFE_FREE(blr);
  55 }
  56
  57 /****************************************************************************
  58  Determine if this is a secondary element of a chained SMB.
  59   **************************************************************************/
  60
  61 static BOOL in_chained_smb(void)
  62 {
  63         return (chain_size != 0);
  64 }
  65
  66 static void received_unlock_msg(int msg_type, struct process_id src,
  67                                 void *buf, size_t len);
  68
  69 /****************************************************************************
  70  Function to push a blocking lock request onto the lock queue.
  71 ****************************************************************************/
  72
  73 BOOL push_blocking_lock_request( char *inbuf, int length,
  74                 files_struct *fsp,
  75                 int lock_timeout,
  76                 int lock_num,
  77                 uint16 lock_pid,
  78                 enum brl_type lock_type,
  79                 enum brl_flavour lock_flav,
  80                 SMB_BIG_UINT offset, SMB_BIG_UINT count)
  81 {
  82         static BOOL set_lock_msg;
  83         blocking_lock_record *blr, *tmp;
  84         BOOL my_lock_ctx = False;
  85         struct byte_range_lock *br_lck = NULL;
  86         NTSTATUS status;
  87
  88         if(in_chained_smb() ) {
  89                 DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
  90                 return False;
  91         }
  92
  93         /*
  94          * Now queue an entry on the blocking lock queue. We setup
  95          * the expiration time here.
  96          */
  97
  98         if((blr = SMB_MALLOC_P(blocking_lock_record)) == NULL) {
  99                 DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
 100                 return False;
 101         }
 102
 103         blr->next = NULL;
 104         blr->prev = NULL;
 105
 106         if((blr->inbuf = (char *)SMB_MALLOC(length)) == NULL) {
 107                 DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
 108                 SAFE_FREE(blr);
 109                 return False;
 110         }
 111
 112         blr->com_type = CVAL(inbuf,smb_com);
 113         blr->fsp = fsp;
 114         blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
 115         blr->lock_num = lock_num;
 116         blr->lock_pid = lock_pid;
 117         blr->lock_flav = lock_flav;
 118         blr->lock_type = lock_type;
 119         blr->offset = offset;
 120         blr->count = count;
 121         memcpy(blr->inbuf, inbuf, length);
 122         blr->length = length;
 123
 124         br_lck = brl_get_locks(blr->fsp);
 125         if (!br_lck) {
 126                 free_blocking_lock_record(blr);
 127                 return False;
 128         }
 129
 130         /* Add a pending lock record for this. */
 131         status = brl_lock(br_lck,
 132                         lock_pid,
 133                         procid_self(),
 134                         offset,
 135                         count,
 136                         PENDING_LOCK,
 137                         blr->lock_flav,
 138                         &my_lock_ctx);
 139         byte_range_lock_destructor(br_lck);
 140
 141         if (!NT_STATUS_IS_OK(status)) {
 142                 DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
 143                 free_blocking_lock_record(blr);
 144                 return False;
 145         }
 146
 147         DLIST_ADD_END(blocking_lock_queue, blr, tmp);
 148
 149         /* Ensure we'll receive messages when this is unlocked. */
 150         if (!set_lock_msg) {
 151                 message_register(MSG_SMB_UNLOCK, received_unlock_msg);
 152                 set_lock_msg = True;
 153         }
 154
 155         DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d (+%d) \
 156 for fnum = %d, name = %s\n", length, (int)blr->expire_time, lock_timeout,
 157                 blr->fsp->fnum, blr->fsp->fsp_name ));
 158
 159         /* Push the MID of this packet on the signing queue. */
 160         srv_defer_sign_response(SVAL(inbuf,smb_mid));
 161
 162         return True;
 163 }
 164
 165 /****************************************************************************
 166  Return a smd with a given size.
 167 *****************************************************************************/
 168
 169 static void send_blocking_reply(char *outbuf, int outsize)
 170 {
 171         if(outsize > 4)
 172                 smb_setlen(outbuf,outsize - 4);
 173
 174         if (!send_smb(smbd_server_fd(),outbuf))
 175                 exit_server("send_blocking_reply: send_smb failed.");
 176 }
 177
 178 /****************************************************************************
 179  Return a lockingX success SMB.
 180 *****************************************************************************/
 181
 182 static void reply_lockingX_success(blocking_lock_record *blr)
 183 {
 184         char *outbuf = get_OutBuffer();
 185         int bufsize = BUFFER_SIZE;
 186         char *inbuf = blr->inbuf;
 187         int outsize = 0;
 188
 189         construct_reply_common(inbuf, outbuf);
 190         set_message(outbuf,2,0,True);
 191
 192         /*
 193          * As this message is a lockingX call we must handle
 194          * any following chained message correctly.
 195          * This is normally handled in construct_reply(),
 196          * but as that calls switch_message, we can't use
 197          * that here and must set up the chain info manually.
 198          */
 199
 200         outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
 201
 202         outsize += chain_size;
 203
 204         send_blocking_reply(outbuf,outsize);
 205 }
 206
 207 /****************************************************************************
 208  Return a generic lock fail error blocking call.
 209 *****************************************************************************/
 210
 211 static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
 212 {
 213         char *outbuf = get_OutBuffer();
 214         char *inbuf = blr->inbuf;
 215         construct_reply_common(inbuf, outbuf);
 216
 217         /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
 218            FILE_LOCK_CONFLICT! (tridge) */
 219         if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
 220                 status = NT_STATUS_FILE_LOCK_CONFLICT;
 221         }
 222
 223         ERROR_NT(status);
 224         if (!send_smb(smbd_server_fd(),outbuf))
 225                 exit_server("generic_blocking_lock_error: send_smb failed.");
 226 }
 227
 228 /****************************************************************************
 229  Return a lock fail error for a lockingX call. Undo all the locks we have
 230  obtained first.
 231 *****************************************************************************/
 232
 233 static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
 234 {
 235         char *inbuf = blr->inbuf;
 236         files_struct *fsp = blr->fsp;
 237         uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
 238         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
 239         uint16 lock_pid;
 240         unsigned char locktype = CVAL(inbuf,smb_vwv3);
 241         BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
 242         char *data;
 243         int i;
 244
 245         data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
 246
 247         /*
 248          * Data now points at the beginning of the list
 249          * of smb_lkrng structs.
 250          */
 251
 252         /*
 253          * Ensure we don't do a remove on the lock that just failed,
 254          * as under POSIX rules, if we have a lock already there, we
 255          * will delete it (and we shouldn't) .....
 256          */
 257
 258         for(i = blr->lock_num - 1; i >= 0; i--) {
 259                 BOOL err;
 260
 261                 lock_pid = get_lock_pid( data, i, large_file_format);
 262                 count = get_lock_count( data, i, large_file_format);
 263                 offset = get_lock_offset( data, i, large_file_format, &err);
 264
 265                 /*
 266                  * We know err cannot be set as if it was the lock
 267                  * request would never have been queued. JRA.
 268                  */
 269
 270                 do_unlock(fsp,
 271                         lock_pid,
 272                         count,
 273                         offset,
 274                         WINDOWS_LOCK);
 275         }
 276
 277         generic_blocking_lock_error(blr, status);
 278 }
 279
 280 /****************************************************************************
 281  Return a lock fail error.
 282 *****************************************************************************/
 283
 284 static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
 285 {
 286         switch(blr->com_type) {
 287 #if 0
 288         /* We no longer push blocking lock requests for anything but lockingX and trans2. */
 289         case SMBlock:
 290         case SMBlockread:
 291                 generic_blocking_lock_error(blr, status);
 292                 break;
 293 #endif
 294         case SMBlockingX:
 295                 reply_lockingX_error(blr, status);
 296                 break;
 297         case SMBtrans2:
 298         case SMBtranss2:
 299                 {
 300                         char *outbuf = get_OutBuffer();
 301                         char *inbuf = blr->inbuf;
 302                         construct_reply_common(inbuf, outbuf);
 303                         /* construct_reply_common has done us the favor to pre-fill the
 304                          * command field with SMBtranss2 which is wrong :-)
 305                          */
 306                         SCVAL(outbuf,smb_com,SMBtrans2);
 307                         ERROR_NT(status);
 308                         if (!send_smb(smbd_server_fd(),outbuf)) {
 309                                 exit_server("blocking_lock_reply_error: send_smb failed.");
 310                         }
 311                         break;
 312                 }
 313         default:
 314                 DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
 315                 exit_server("PANIC - unknown type on blocking lock queue");
 316         }
 317 }
 318
 319 #if 0
 320 /* We no longer push blocking lock requests for anything but lockingX and trans2. */
 321
 322 /****************************************************************************
 323  Attempt to finish off getting all pending blocking locks for a lockread call.
 324  Returns True if we want to be removed from the list.
 325 *****************************************************************************/
 326
 327 static BOOL process_lockread(blocking_lock_record *blr)
 328 {
 329         char *outbuf = get_OutBuffer();
 330         char *inbuf = blr->inbuf;
 331         ssize_t nread = -1;
 332         char *data, *p;
 333         int outsize = 0;
 334         SMB_BIG_UINT startpos;
 335         size_t numtoread;
 336         NTSTATUS status;
 337         files_struct *fsp = blr->fsp;
 338         BOOL my_lock_ctx = False;
 339
 340         numtoread = SVAL(inbuf,smb_vwv1);
 341         startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
 342
 343         numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
 344         data = smb_buf(outbuf) + 3;
 345
 346         status = do_lock_spin(fsp,
 347                                 SVAL(inbuf,smb_pid),
 348                                 (SMB_BIG_UINT)numtoread,
 349                                 startpos,
 350                                 READ_LOCK,
 351                                 WINDOWS_LOCK,
 352                                 &my_lock_ctx);
 353
 354         if (NT_STATUS_V(status)) {
 355                 if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 356                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 357                         /*
 358                          * We have other than a "can't get lock"
 359                          * error. Send an error.
 360                          * Return True so we get dequeued.
 361                          */
 362                         generic_blocking_lock_error(blr, status);
 363                         return True;
 364                 }
 365
 366                 /*
 367                  * Still waiting for lock....
 368                  */
 369
 370                 DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
 371                           fsp->fsp_name));
 372                 return False;
 373         }
 374
 375         nread = read_file(fsp,data,startpos,numtoread);
 376
 377         if (nread < 0) {
 378                 generic_blocking_lock_error(blr,NT_STATUS_ACCESS_DENIED);
 379                 return True;
 380         }
 381
 382         construct_reply_common(inbuf, outbuf);
 383         outsize = set_message(outbuf,5,0,True);
 384
 385         outsize += nread;
 386         SSVAL(outbuf,smb_vwv0,nread);
 387         SSVAL(outbuf,smb_vwv5,nread+3);
 388         p = smb_buf(outbuf);
 389         *p++ = 1;
 390         SSVAL(p,0,nread); p += 2;
 391         set_message_end(outbuf, p+nread);
 392
 393         DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%lu nread=%ld\n",
 394                    fsp->fsp_name, fsp->fnum, (unsigned long)numtoread, (long)nread ) );
 395
 396         send_blocking_reply(outbuf,outsize);
 397         return True;
 398 }
 399
 400 /****************************************************************************
 401  Attempt to finish off getting all pending blocking locks for a lock call.
 402  Returns True if we want to be removed from the list.
 403 *****************************************************************************/
 404
 405 static BOOL process_lock(blocking_lock_record *blr)
 406 {
 407         char *outbuf = get_OutBuffer();
 408         char *inbuf = blr->inbuf;
 409         int outsize;
 410         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
 411         NTSTATUS status;
 412         files_struct *fsp = blr->fsp;
 413         BOOL my_lock_ctx = False;
 414
 415         count = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
 416         offset = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 417
 418         errno = 0;
 419         status = do_lock_spin(fsp,
 420                                 SVAL(inbuf,smb_pid),
 421                                 count,
 422                                 offset,
 423                                 WRITE_LOCK,
 424                                 WINDOWS_LOCK,
 425                                 &my_lock_ctx);
 426
 427         if (NT_STATUS_IS_ERR(status)) {
 428                 if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 429                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 430                         /*
 431                          * We have other than a "can't get lock"
 432                          * error. Send an error.
 433                          * Return True so we get dequeued.
 434                          */
 435
 436                         blocking_lock_reply_error(blr, status);
 437                         return True;
 438                 }
 439                 /*
 440                  * Still can't get the lock - keep waiting.
 441                  */
 442                 DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
 443                           fsp->fsp_name));
 444                 return False;
 445         }
 446
 447         /*
 448          * Success - we got the lock.
 449          */
 450
 451         DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
 452                  fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
 453
 454         construct_reply_common(inbuf, outbuf);
 455         outsize = set_message(outbuf,0,0,True);
 456         send_blocking_reply(outbuf,outsize);
 457         return True;
 458 }
 459 #endif
 460
 461 /****************************************************************************
 462  Attempt to finish off getting all pending blocking locks for a lockingX call.
 463  Returns True if we want to be removed from the list.
 464 *****************************************************************************/
 465
 466 static BOOL process_lockingX(blocking_lock_record *blr)
 467 {
 468         char *inbuf = blr->inbuf;
 469         unsigned char locktype = CVAL(inbuf,smb_vwv3);
 470         files_struct *fsp = blr->fsp;
 471         uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
 472         uint16 num_locks = SVAL(inbuf,smb_vwv7);
 473         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
 474         uint16 lock_pid;
 475         BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
 476         char *data;
 477         BOOL my_lock_ctx = False;
 478         NTSTATUS status = NT_STATUS_OK;
 479
 480         data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
 481
 482         /*
 483          * Data now points at the beginning of the list
 484          * of smb_lkrng structs.
 485          */
 486
 487         for(; blr->lock_num < num_locks; blr->lock_num++) {
 488                 BOOL err;
 489
 490                 lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
 491                 count = get_lock_count( data, blr->lock_num, large_file_format);
 492                 offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
 493
 494                 /*
 495                  * We know err cannot be set as if it was the lock
 496                  * request would never have been queued. JRA.
 497                  */
 498                 errno = 0;
 499                 status = do_lock_spin(fsp,
 500                                 lock_pid,
 501                                 count,
 502                                 offset,
 503                                 ((locktype & 1) ? READ_LOCK : WRITE_LOCK),
 504                                 WINDOWS_LOCK,
 505                                 &my_lock_ctx);
 506
 507                 if (NT_STATUS_IS_ERR(status)) {
 508                         break;
 509                 }
 510         }
 511
 512         if(blr->lock_num == num_locks) {
 513                 /*
 514                  * Success - we got all the locks.
 515                  */
 516
 517                 DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
 518                          fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
 519
 520                 reply_lockingX_success(blr);
 521                 return True;
 522         } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 523                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 524                         /*
 525                          * We have other than a "can't get lock"
 526                          * error. Free any locks we had and return an error.
 527                          * Return True so we get dequeued.
 528                          */
 529
 530                 blocking_lock_reply_error(blr, status);
 531                 return True;
 532         }
 533
 534         /*
 535          * Still can't get all the locks - keep waiting.
 536          */
 537
 538         DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
 539 Waiting....\n",
 540                   blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
 541
 542         return False;
 543 }
 544
 545 /****************************************************************************
 546  Attempt to get the posix lock request from a SMBtrans2 call.
 547  Returns True if we want to be removed from the list.
 548 *****************************************************************************/
 549
 550 static BOOL process_trans2(blocking_lock_record *blr)
 551 {
 552         extern int max_send;
 553         char *inbuf = blr->inbuf;
 554         char *outbuf;
 555         BOOL my_lock_ctx = False;
 556         char params[2];
 557         NTSTATUS status;
 558
 559         status = do_lock(blr->fsp,
 560                         blr->lock_pid,
 561                         blr->count,
 562                         blr->offset,
 563                         blr->lock_type,
 564                         blr->lock_flav,
 565                         &my_lock_ctx);
 566
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 if (ERROR_WAS_LOCK_DENIED(status)) {
 569                         /* Still can't get the lock, just keep waiting. */
 570                         return False;
 571                 }
 572                 /*
 573                  * We have other than a "can't get lock"
 574                  * error. Send an error and return True so we get dequeued.
 575                  */
 576                 blocking_lock_reply_error(blr, status);
 577                 return True;
 578         }
 579
 580         /* We finally got the lock, return success. */
 581         outbuf = get_OutBuffer();
 582         construct_reply_common(inbuf, outbuf);
 583         SCVAL(outbuf,smb_com,SMBtrans2);
 584         SSVAL(params,0,0);
 585         send_trans2_replies(outbuf, max_send, params, 2, NULL, 0);
 586         return True;
 587 }
 588
 589
 590 /****************************************************************************
 591  Process a blocking lock SMB.
 592  Returns True if we want to be removed from the list.
 593 *****************************************************************************/
 594
 595 static BOOL blocking_lock_record_process(blocking_lock_record *blr)
 596 {
 597         switch(blr->com_type) {
 598 #if 0
 599                 /* We no longer push blocking lock requests for anything but lockingX and trans2. */
 600                 case SMBlock:
 601                         return process_lock(blr);
 602                 case SMBlockread:
 603                         return process_lockread(blr);
 604 #endif
 605                 case SMBlockingX:
 606                         return process_lockingX(blr);
 607                 case SMBtrans2:
 608                 case SMBtranss2:
 609                         return process_trans2(blr);
 610                 default:
 611                         DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
 612                         exit_server("PANIC - unknown type on blocking lock queue");
 613         }
 614         return False; /* Keep compiler happy. */
 615 }
 616
 617 /****************************************************************************
 618  Delete entries by fnum from the blocking lock pending queue.
 619 *****************************************************************************/
 620
 621 void remove_pending_lock_requests_by_fid(files_struct *fsp)
 622 {
 623         blocking_lock_record *blr, *next = NULL;
 624
 625         for(blr = blocking_lock_queue; blr; blr = next) {
 626                 next = blr->next;
 627                 if(blr->fsp->fnum == fsp->fnum) {
 628                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 629
 630                         if (br_lck) {
 631                                 DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
 632 file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
 633
 634                                 brl_remove_pending_lock(br_lck,
 635                                         blr->lock_pid,
 636                                         procid_self(),
 637                                         blr->offset,
 638                                         blr->count,
 639                                         blr->lock_flav);
 640                                 byte_range_lock_destructor(br_lck);
 641
 642                         }
 643
 644                         free_blocking_lock_record(blr);
 645                 }
 646         }
 647 }
 648
 649 /****************************************************************************
 650  Delete entries by mid from the blocking lock pending queue. Always send reply.
 651 *****************************************************************************/
 652
 653 void remove_pending_lock_requests_by_mid(int mid)
 654 {
 655         blocking_lock_record *blr, *next = NULL;
 656
 657         for(blr = blocking_lock_queue; blr; blr = next) {
 658                 next = blr->next;
 659                 if(SVAL(blr->inbuf,smb_mid) == mid) {
 660                         files_struct *fsp = blr->fsp;
 661                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 662
 663                         if (br_lck) {
 664                                 DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
 665 file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
 666
 667                                 brl_remove_pending_lock(br_lck,
 668                                         blr->lock_pid,
 669                                         procid_self(),
 670                                         blr->offset,
 671                                         blr->count,
 672                                         blr->lock_flav);
 673                                 byte_range_lock_destructor(br_lck);
 674                         }
 675
 676                         blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
 677                         free_blocking_lock_record(blr);
 678                 }
 679         }
 680 }
 681
 682 /****************************************************************************
 683   Set a flag as an unlock request affects one of our pending locks.
 684 *****************************************************************************/
 685
 686 static void received_unlock_msg(int msg_type, struct process_id src,
 687                                 void *buf, size_t len)
 688 {
 689         DEBUG(10,("received_unlock_msg\n"));
 690         process_blocking_lock_queue(time(NULL));
 691 }
 692
 693 /****************************************************************************
 694  Return the number of seconds to the next blocking locks timeout, or default_timeout
 695 *****************************************************************************/
 696
 697 unsigned blocking_locks_timeout(unsigned default_timeout)
 698 {
 699         unsigned timeout = default_timeout;
 700         time_t t;
 701         blocking_lock_record *blr = blocking_lock_queue;
 702
 703         /* note that we avoid the time() syscall if there are no blocking locks */
 704         if (!blr)
 705                 return timeout;
 706
 707         t = time(NULL);
 708
 709         for (; blr; blr = blr->next) {
 710                 if ((blr->expire_time != (time_t)-1) &&
 711                                         (timeout > (blr->expire_time - t))) {
 712                         timeout = blr->expire_time - t;
 713                 }
 714         }
 715
 716         if (timeout < 1)
 717                 timeout = 1;
 718
 719         return timeout;
 720 }
 721
 722 /****************************************************************************
 723  Process the blocking lock queue. Note that this is only called as root.
 724 *****************************************************************************/
 725
 726 void process_blocking_lock_queue(time_t t)
 727 {
 728         blocking_lock_record *blr, *next = NULL;
 729
 730         /*
 731          * Go through the queue and see if we can get any of the locks.
 732          */
 733
 734         for (blr = blocking_lock_queue; blr; blr = next) {
 735                 connection_struct *conn = NULL;
 736                 uint16 vuid;
 737                 files_struct *fsp = NULL;
 738
 739                 next = blr->next;
 740
 741                 /*
 742                  * Ensure we don't have any old chain_fsp values
 743                  * sitting around....
 744                  */
 745                 chain_size = 0;
 746                 file_chain_reset();
 747                 fsp = blr->fsp;
 748
 749                 conn = conn_find(SVAL(blr->inbuf,smb_tid));
 750                 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
 751                                 SVAL(blr->inbuf,smb_uid);
 752
 753                 DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
 754                         fsp->fnum, fsp->fsp_name ));
 755
 756                 if((blr->expire_time != -1) && (blr->expire_time <= t)) {
 757                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 758
 759                         /*
 760                          * Lock expired - throw away all previously
 761                          * obtained locks and return lock error.
 762                          */
 763
 764                         if (br_lck) {
 765                                 DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
 766                                         fsp->fnum, fsp->fsp_name ));
 767
 768                                 brl_remove_pending_lock(br_lck,
 769                                         blr->lock_pid,
 770                                         procid_self(),
 771                                         blr->offset,
 772                                         blr->count,
 773                                         blr->lock_flav);
 774                                 byte_range_lock_destructor(br_lck);
 775                         }
 776
 777                         blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
 778                         free_blocking_lock_record(blr);
 779                         continue;
 780                 }
 781
 782                 if(!change_to_user(conn,vuid)) {
 783                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 784
 785                         /*
 786                          * Remove the entry and return an error to the client.
 787                          */
 788
 789                         if (br_lck) {
 790                                 brl_remove_pending_lock(br_lck,
 791                                         blr->lock_pid,
 792                                         procid_self(),
 793                                         blr->offset,
 794                                         blr->count,
 795                                         blr->lock_flav);
 796                                 byte_range_lock_destructor(br_lck);
 797                         }
 798
 799                         DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
 800                                 vuid ));
 801                         blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
 802                         free_blocking_lock_record(blr);
 803                         continue;
 804                 }
 805
 806                 if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
 807                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 808
 809                         /*
 810                          * Remove the entry and return an error to the client.
 811                          */
 812
 813                         if (br_lck) {
 814                                 brl_remove_pending_lock(br_lck,
 815                                         blr->lock_pid,
 816                                         procid_self(),
 817                                         blr->offset,
 818                                         blr->count,
 819                                         blr->lock_flav);
 820                                 byte_range_lock_destructor(br_lck);
 821                         }
 822
 823                         DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
 824                         blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
 825                         free_blocking_lock_record(blr);
 826                         change_to_root_user();
 827                         continue;
 828                 }
 829
 830                 /*
 831                  * Go through the remaining locks and try and obtain them.
 832                  * The call returns True if all locks were obtained successfully
 833                  * and False if we still need to wait.
 834                  */
 835
 836                 if(blocking_lock_record_process(blr)) {
 837                         struct byte_range_lock *br_lck = brl_get_locks(fsp);
 838
 839                         if (br_lck) {
 840                                 brl_remove_pending_lock(br_lck,
 841                                         blr->lock_pid,
 842                                         procid_self(),
 843                                         blr->offset,
 844                                         blr->count,
 845                                         blr->lock_flav);
 846                                 byte_range_lock_destructor(br_lck);
 847                         }
 848
 849                         free_blocking_lock_record(blr);
 850                 }
 851                 change_to_root_user();
 852         }
 853 }