source3/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 extern char *OutBuffer;
  24
  25 /****************************************************************************
  26  This is the structure to queue to implement blocking locks.
  27  notify. It consists of the requesting SMB and the expiry time.
  28 *****************************************************************************/
  29
  30 typedef struct _blocking_lock_record {
  31         struct _blocking_lock_record *next;
  32         struct _blocking_lock_record *prev;
  33         int com_type;
  34         files_struct *fsp;
  35         time_t expire_time;
  36         int lock_num;
  37         SMB_BIG_UINT offset;
  38         SMB_BIG_UINT count;
  39         uint16 lock_pid;
  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  Get the files_struct given a particular queued SMB.
  59 *****************************************************************************/
  60
  61 static files_struct *get_fsp_from_pkt(char *inbuf)
  62 {
  63         switch(CVAL(inbuf,smb_com)) {
  64                 case SMBlock:
  65                 case SMBlockread:
  66                         return file_fsp(inbuf,smb_vwv0);
  67                 case SMBlockingX:
  68                         return file_fsp(inbuf,smb_vwv2);
  69                 default:
  70                         DEBUG(0,("get_fsp_from_pkt: PANIC - unknown type on blocking lock queue - exiting.!\n"));
  71                         exit_server("PANIC - unknown type on blocking lock queue");
  72         }
  73         return NULL; /* Keep compiler happy. */
  74 }
  75
  76 /****************************************************************************
  77  Determine if this is a secondary element of a chained SMB.
  78   **************************************************************************/
  79
  80 static BOOL in_chained_smb(void)
  81 {
  82         return (chain_size != 0);
  83 }
  84
  85 static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len);
  86
  87 /****************************************************************************
  88  Function to push a blocking lock request onto the lock queue.
  89 ****************************************************************************/
  90
  91 BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout,
  92                 int lock_num, uint16 lock_pid, SMB_BIG_UINT offset, SMB_BIG_UINT count)
  93 {
  94         static BOOL set_lock_msg;
  95         blocking_lock_record *blr, *tmp;
  96         BOOL my_lock_ctx = False;
  97         NTSTATUS status;
  98
  99         if(in_chained_smb() ) {
 100                 DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
 101                 return False;
 102         }
 103
 104         /*
 105          * Now queue an entry on the blocking lock queue. We setup
 106          * the expiration time here.
 107          */
 108
 109         if((blr = (blocking_lock_record *)malloc(sizeof(blocking_lock_record))) == NULL) {
 110                 DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
 111                 return False;
 112         }
 113
 114         if((blr->inbuf = (char *)malloc(length)) == NULL) {
 115                 DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
 116                 SAFE_FREE(blr);
 117                 return False;
 118         }
 119
 120         blr->com_type = CVAL(inbuf,smb_com);
 121         blr->fsp = get_fsp_from_pkt(inbuf);
 122         blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
 123         blr->lock_num = lock_num;
 124         blr->lock_pid = lock_pid;
 125         blr->offset = offset;
 126         blr->count = count;
 127         memcpy(blr->inbuf, inbuf, length);
 128         blr->length = length;
 129
 130         /* Add a pending lock record for this. */
 131         status = brl_lock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
 132                         lock_pid, sys_getpid(), blr->fsp->conn->cnum,
 133                         offset, count, PENDING_LOCK, &my_lock_ctx);
 134
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
 137                 free_blocking_lock_record(blr);
 138                 return False;
 139         }
 140
 141         DLIST_ADD_END(blocking_lock_queue, blr, tmp);
 142
 143         /* Ensure we'll receive messages when this is unlocked. */
 144         if (!set_lock_msg) {
 145                 message_register(MSG_SMB_UNLOCK, received_unlock_msg);
 146                 set_lock_msg = True;
 147         }
 148
 149         DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d (+%d) \
 150 for fnum = %d, name = %s\n", length, (int)blr->expire_time, lock_timeout,
 151                 blr->fsp->fnum, blr->fsp->fsp_name ));
 152
 153         /* Push the MID of this packet on the signing queue. */
 154         srv_defer_sign_response(SVAL(inbuf,smb_mid));
 155
 156         return True;
 157 }
 158
 159 /****************************************************************************
 160  Return a smd with a given size.
 161 *****************************************************************************/
 162
 163 static void send_blocking_reply(char *outbuf, int outsize)
 164 {
 165         if(outsize > 4)
 166                 smb_setlen(outbuf,outsize - 4);
 167
 168         if (!send_smb(smbd_server_fd(),outbuf))
 169                 exit_server("send_blocking_reply: send_smb failed.");
 170 }
 171
 172 /****************************************************************************
 173  Return a lockingX success SMB.
 174 *****************************************************************************/
 175
 176 static void reply_lockingX_success(blocking_lock_record *blr)
 177 {
 178         char *outbuf = OutBuffer;
 179         int bufsize = BUFFER_SIZE;
 180         char *inbuf = blr->inbuf;
 181         int outsize = 0;
 182
 183         construct_reply_common(inbuf, outbuf);
 184         set_message(outbuf,2,0,True);
 185
 186         /*
 187          * As this message is a lockingX call we must handle
 188          * any following chained message correctly.
 189          * This is normally handled in construct_reply(),
 190          * but as that calls switch_message, we can't use
 191          * that here and must set up the chain info manually.
 192          */
 193
 194         outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
 195
 196         outsize += chain_size;
 197
 198         send_blocking_reply(outbuf,outsize);
 199 }
 200
 201 /****************************************************************************
 202  Return a generic lock fail error blocking call.
 203 *****************************************************************************/
 204
 205 static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
 206 {
 207         char *outbuf = OutBuffer;
 208         char *inbuf = blr->inbuf;
 209         construct_reply_common(inbuf, outbuf);
 210
 211         /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
 212            FILE_LOCK_CONFLICT! (tridge) */
 213         if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
 214                 status = NT_STATUS_FILE_LOCK_CONFLICT;
 215         }
 216
 217         ERROR_NT(status);
 218         if (!send_smb(smbd_server_fd(),outbuf))
 219                 exit_server("generic_blocking_lock_error: send_smb failed.");
 220 }
 221
 222 /****************************************************************************
 223  Return a lock fail error for a lockingX call. Undo all the locks we have
 224  obtained first.
 225 *****************************************************************************/
 226
 227 static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
 228 {
 229         char *inbuf = blr->inbuf;
 230         files_struct *fsp = blr->fsp;
 231         connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 232         uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
 233         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
 234         uint16 lock_pid;
 235         unsigned char locktype = CVAL(inbuf,smb_vwv3);
 236         BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
 237         char *data;
 238         int i;
 239
 240         data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
 241
 242         /*
 243          * Data now points at the beginning of the list
 244          * of smb_lkrng structs.
 245          */
 246
 247         /*
 248          * Ensure we don't do a remove on the lock that just failed,
 249          * as under POSIX rules, if we have a lock already there, we
 250          * will delete it (and we shouldn't) .....
 251          */
 252
 253         for(i = blr->lock_num - 1; i >= 0; i--) {
 254                 BOOL err;
 255
 256                 lock_pid = get_lock_pid( data, i, large_file_format);
 257                 count = get_lock_count( data, i, large_file_format);
 258                 offset = get_lock_offset( data, i, large_file_format, &err);
 259
 260                 /*
 261                  * We know err cannot be set as if it was the lock
 262                  * request would never have been queued. JRA.
 263                  */
 264
 265                 do_unlock(fsp,conn,lock_pid,count,offset);
 266         }
 267
 268         generic_blocking_lock_error(blr, status);
 269 }
 270
 271 /****************************************************************************
 272  Return a lock fail error.
 273 *****************************************************************************/
 274
 275 static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
 276 {
 277         switch(blr->com_type) {
 278         case SMBlock:
 279         case SMBlockread:
 280                 generic_blocking_lock_error(blr, status);
 281                 break;
 282         case SMBlockingX:
 283                 reply_lockingX_error(blr, status);
 284                 break;
 285         default:
 286                 DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
 287                 exit_server("PANIC - unknown type on blocking lock queue");
 288         }
 289 }
 290
 291 /****************************************************************************
 292  Attempt to finish off getting all pending blocking locks for a lockread call.
 293  Returns True if we want to be removed from the list.
 294 *****************************************************************************/
 295
 296 static BOOL process_lockread(blocking_lock_record *blr)
 297 {
 298         char *outbuf = OutBuffer;
 299         char *inbuf = blr->inbuf;
 300         ssize_t nread = -1;
 301         char *data, *p;
 302         int outsize = 0;
 303         SMB_BIG_UINT startpos;
 304         size_t numtoread;
 305         NTSTATUS status;
 306         connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 307         files_struct *fsp = blr->fsp;
 308         BOOL my_lock_ctx = False;
 309
 310         numtoread = SVAL(inbuf,smb_vwv1);
 311         startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
 312
 313         numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
 314         data = smb_buf(outbuf) + 3;
 315
 316         status = do_lock_spin( fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)numtoread, startpos, READ_LOCK, &my_lock_ctx);
 317         if (NT_STATUS_V(status)) {
 318                 if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 319                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 320                         /*
 321                          * We have other than a "can't get lock"
 322                          * error. Send an error.
 323                          * Return True so we get dequeued.
 324                          */
 325                         generic_blocking_lock_error(blr, status);
 326                         return True;
 327                 }
 328
 329                 /*
 330                  * Still waiting for lock....
 331                  */
 332
 333                 DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
 334                           fsp->fsp_name));
 335                 return False;
 336         }
 337
 338         nread = read_file(fsp,data,startpos,numtoread);
 339
 340         if (nread < 0) {
 341                 generic_blocking_lock_error(blr,NT_STATUS_ACCESS_DENIED);
 342                 return True;
 343         }
 344
 345         construct_reply_common(inbuf, outbuf);
 346         outsize = set_message(outbuf,5,0,True);
 347
 348         outsize += nread;
 349         SSVAL(outbuf,smb_vwv0,nread);
 350         SSVAL(outbuf,smb_vwv5,nread+3);
 351         p = smb_buf(outbuf);
 352         *p++ = 1;
 353         SSVAL(p,0,nread); p += 2;
 354         set_message_end(outbuf, p+nread);
 355
 356         DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
 357                    fsp->fsp_name, fsp->fnum, (int)numtoread, (int)nread ) );
 358
 359         send_blocking_reply(outbuf,outsize);
 360         return True;
 361 }
 362
 363 /****************************************************************************
 364  Attempt to finish off getting all pending blocking locks for a lock call.
 365  Returns True if we want to be removed from the list.
 366 *****************************************************************************/
 367
 368 static BOOL process_lock(blocking_lock_record *blr)
 369 {
 370         char *outbuf = OutBuffer;
 371         char *inbuf = blr->inbuf;
 372         int outsize;
 373         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
 374         NTSTATUS status;
 375         connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 376         files_struct *fsp = blr->fsp;
 377         BOOL my_lock_ctx = False;
 378
 379         count = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
 380         offset = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 381
 382         errno = 0;
 383         status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), count, offset, WRITE_LOCK, &my_lock_ctx);
 384         if (NT_STATUS_IS_ERR(status)) {
 385                 if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 386                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 387                         /*
 388                          * We have other than a "can't get lock"
 389                          * error. Send an error.
 390                          * Return True so we get dequeued.
 391                          */
 392
 393                         blocking_lock_reply_error(blr, status);
 394                         return True;
 395                 }
 396                 /*
 397                  * Still can't get the lock - keep waiting.
 398                  */
 399                 DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
 400                           fsp->fsp_name));
 401                 return False;
 402         }
 403
 404         /*
 405          * Success - we got the lock.
 406          */
 407
 408         DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
 409                  fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
 410
 411         construct_reply_common(inbuf, outbuf);
 412         outsize = set_message(outbuf,0,0,True);
 413         send_blocking_reply(outbuf,outsize);
 414         return True;
 415 }
 416
 417 /****************************************************************************
 418  Attempt to finish off getting all pending blocking locks for a lockingX call.
 419  Returns True if we want to be removed from the list.
 420 *****************************************************************************/
 421
 422 static BOOL process_lockingX(blocking_lock_record *blr)
 423 {
 424         char *inbuf = blr->inbuf;
 425         unsigned char locktype = CVAL(inbuf,smb_vwv3);
 426         files_struct *fsp = blr->fsp;
 427         connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 428         uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
 429         uint16 num_locks = SVAL(inbuf,smb_vwv7);
 430         SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
 431         uint16 lock_pid;
 432         BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
 433         char *data;
 434         BOOL my_lock_ctx = False;
 435         NTSTATUS status = NT_STATUS_OK;
 436
 437         data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
 438
 439         /*
 440          * Data now points at the beginning of the list
 441          * of smb_lkrng structs.
 442          */
 443
 444         for(; blr->lock_num < num_locks; blr->lock_num++) {
 445                 BOOL err;
 446
 447                 lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
 448                 count = get_lock_count( data, blr->lock_num, large_file_format);
 449                 offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
 450
 451                 /*
 452                  * We know err cannot be set as if it was the lock
 453                  * request would never have been queued. JRA.
 454                  */
 455                 errno = 0;
 456                 status = do_lock_spin(fsp,conn,lock_pid,count,offset,
 457                                  ((locktype & 1) ? READ_LOCK : WRITE_LOCK), &my_lock_ctx);
 458                 if (NT_STATUS_IS_ERR(status)) break;
 459         }
 460
 461         if(blr->lock_num == num_locks) {
 462                 /*
 463                  * Success - we got all the locks.
 464                  */
 465
 466                 DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
 467                          fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
 468
 469                 reply_lockingX_success(blr);
 470                 return True;
 471         } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 472                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 473                         /*
 474                          * We have other than a "can't get lock"
 475                          * error. Free any locks we had and return an error.
 476                          * Return True so we get dequeued.
 477                          */
 478
 479                 blocking_lock_reply_error(blr, status);
 480                 return True;
 481         }
 482
 483         /*
 484          * Still can't get all the locks - keep waiting.
 485          */
 486
 487         DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
 488 Waiting....\n",
 489                   blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
 490
 491         return False;
 492 }
 493
 494 /****************************************************************************
 495  Process a blocking lock SMB.
 496  Returns True if we want to be removed from the list.
 497 *****************************************************************************/
 498
 499 static BOOL blocking_lock_record_process(blocking_lock_record *blr)
 500 {
 501         switch(blr->com_type) {
 502                 case SMBlock:
 503                         return process_lock(blr);
 504                 case SMBlockread:
 505                         return process_lockread(blr);
 506                 case SMBlockingX:
 507                         return process_lockingX(blr);
 508                 default:
 509                         DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
 510                         exit_server("PANIC - unknown type on blocking lock queue");
 511         }
 512         return False; /* Keep compiler happy. */
 513 }
 514
 515 /****************************************************************************
 516  Delete entries by fnum from the blocking lock pending queue.
 517 *****************************************************************************/
 518
 519 void remove_pending_lock_requests_by_fid(files_struct *fsp)
 520 {
 521         blocking_lock_record *blr, *next = NULL;
 522
 523         for(blr = blocking_lock_queue; blr; blr = next) {
 524                 next = blr->next;
 525                 if(blr->fsp->fnum == fsp->fnum) {
 526
 527                         DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
 528 file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
 529
 530                         brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
 531                                 blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
 532                                 blr->offset, blr->count, True, NULL, NULL);
 533
 534                         free_blocking_lock_record(blr);
 535                 }
 536         }
 537 }
 538
 539 /****************************************************************************
 540  Delete entries by mid from the blocking lock pending queue. Always send reply.
 541 *****************************************************************************/
 542
 543 void remove_pending_lock_requests_by_mid(int mid)
 544 {
 545         blocking_lock_record *blr, *next = NULL;
 546
 547         for(blr = blocking_lock_queue; blr; blr = next) {
 548                 next = blr->next;
 549                 if(SVAL(blr->inbuf,smb_mid) == mid) {
 550                         files_struct *fsp = blr->fsp;
 551
 552                         DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
 553 file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
 554
 555                         blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
 556                         brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
 557                                 blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
 558                                 blr->offset, blr->count, True, NULL, NULL);
 559                         free_blocking_lock_record(blr);
 560                 }
 561         }
 562 }
 563
 564 /****************************************************************************
 565   Set a flag as an unlock request affects one of our pending locks.
 566 *****************************************************************************/
 567
 568 static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len)
 569 {
 570         DEBUG(10,("received_unlock_msg\n"));
 571         process_blocking_lock_queue(time(NULL));
 572 }
 573
 574 /****************************************************************************
 575  Return the number of seconds to the next blocking locks timeout, or default_timeout
 576 *****************************************************************************/
 577
 578 unsigned blocking_locks_timeout(unsigned default_timeout)
 579 {
 580         unsigned timeout = default_timeout;
 581         time_t t;
 582         blocking_lock_record *blr = blocking_lock_queue;
 583
 584         /* note that we avoid the time() syscall if there are no blocking locks */
 585         if (!blr)
 586                 return timeout;
 587
 588         t = time(NULL);
 589
 590         for (; blr; blr = blr->next) {
 591                 if ((blr->expire_time != (time_t)-1) &&
 592                                         (timeout > (blr->expire_time - t))) {
 593                         timeout = blr->expire_time - t;
 594                 }
 595         }
 596
 597         if (timeout < 1)
 598                 timeout = 1;
 599
 600         return timeout;
 601 }
 602
 603 /****************************************************************************
 604  Process the blocking lock queue. Note that this is only called as root.
 605 *****************************************************************************/
 606
 607 void process_blocking_lock_queue(time_t t)
 608 {
 609         blocking_lock_record *blr, *next = NULL;
 610
 611         /*
 612          * Go through the queue and see if we can get any of the locks.
 613          */
 614
 615         for (blr = blocking_lock_queue; blr; blr = next) {
 616                 connection_struct *conn = NULL;
 617                 uint16 vuid;
 618                 files_struct *fsp = NULL;
 619
 620                 next = blr->next;
 621
 622                 /*
 623                  * Ensure we don't have any old chain_fsp values
 624                  * sitting around....
 625                  */
 626                 chain_size = 0;
 627                 file_chain_reset();
 628                 fsp = blr->fsp;
 629
 630                 conn = conn_find(SVAL(blr->inbuf,smb_tid));
 631                 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
 632                                 SVAL(blr->inbuf,smb_uid);
 633
 634                 DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
 635                         fsp->fnum, fsp->fsp_name ));
 636
 637                 if((blr->expire_time != -1) && (blr->expire_time <= t)) {
 638                         /*
 639                          * Lock expired - throw away all previously
 640                          * obtained locks and return lock error.
 641                          */
 642                         DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
 643                                 fsp->fnum, fsp->fsp_name ));
 644
 645                         brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
 646                                 blr->lock_pid, sys_getpid(), conn->cnum,
 647                                 blr->offset, blr->count, True, NULL, NULL);
 648
 649                         blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
 650                         free_blocking_lock_record(blr);
 651                         continue;
 652                 }
 653
 654                 if(!change_to_user(conn,vuid)) {
 655                         DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
 656                                 vuid ));
 657                         /*
 658                          * Remove the entry and return an error to the client.
 659                          */
 660                         blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
 661
 662                         brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
 663                                         blr->lock_pid, sys_getpid(), conn->cnum,
 664                                         blr->offset, blr->count, True, NULL, NULL);
 665
 666                         free_blocking_lock_record(blr);
 667                         continue;
 668                 }
 669
 670                 if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
 671                         DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
 672                         /*
 673                          * Remove the entry and return an error to the client.
 674                          */
 675                         blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
 676
 677                         brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
 678                                         blr->lock_pid, sys_getpid(), conn->cnum,
 679                                         blr->offset, blr->count, True, NULL, NULL);
 680
 681                         free_blocking_lock_record(blr);
 682                         change_to_root_user();
 683                         continue;
 684                 }
 685
 686                 /*
 687                  * Go through the remaining locks and try and obtain them.
 688                  * The call returns True if all locks were obtained successfully
 689                  * and False if we still need to wait.
 690                  */
 691
 692                 if(blocking_lock_record_process(blr)) {
 693
 694                         brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
 695                                         blr->lock_pid, sys_getpid(), conn->cnum,
 696                                         blr->offset, blr->count, True, NULL, NULL);
 697
 698                         free_blocking_lock_record(blr);
 699                 }
 700                 change_to_root_user();
 701         }
 702 }