source/smbd/oplock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    oplock processing
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 1998 - 2001
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /* Oplock ipc UDP socket. */
  25 static int oplock_sock = -1;
  26 uint16 global_oplock_port = 0;
  27
  28 /* Current number of oplocks we have outstanding. */
  29 static int32 exclusive_oplocks_open = 0;
  30 static int32 level_II_oplocks_open = 0;
  31 BOOL global_client_failed_oplock_break = False;
  32 BOOL global_oplock_break = False;
  33
  34 extern struct timeval smb_last_time;
  35 extern uint32 global_client_caps;
  36 extern struct current_user current_user;
  37 extern int smb_read_error;
  38
  39 static struct kernel_oplocks *koplocks;
  40
  41 static BOOL oplock_break(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id, BOOL local);
  42
  43 /****************************************************************************
  44  Get the number of current exclusive oplocks.
  45 ****************************************************************************/
  46
  47 int32 get_number_of_exclusive_open_oplocks(void)
  48 {
  49   return exclusive_oplocks_open;
  50 }
  51
  52 /****************************************************************************
  53  Return True if an oplock message is pending.
  54 ****************************************************************************/
  55
  56 BOOL oplock_message_waiting(fd_set *fds)
  57 {
  58         if (koplocks && koplocks->msg_waiting(fds))
  59                 return True;
  60
  61         if (FD_ISSET(oplock_sock, fds))
  62                 return True;
  63
  64         return False;
  65 }
  66
  67 /****************************************************************************
  68  Read an oplock break message from either the oplock UDP fd or the
  69  kernel (if kernel oplocks are supported).
  70
  71  If timeout is zero then *fds contains the file descriptors that
  72  are ready to be read and acted upon. If timeout is non-zero then
  73  *fds contains the file descriptors to be selected on for read.
  74  The timeout is in milliseconds
  75
  76 ****************************************************************************/
  77
  78 BOOL receive_local_message( char *buffer, int buffer_len, int timeout)
  79 {
  80         struct sockaddr_in from;
  81         socklen_t fromlen = sizeof(from);
  82         int32 msg_len = 0;
  83         fd_set fds;
  84         int selrtn = -1;
  85
  86         FD_ZERO(&fds);
  87         smb_read_error = 0;
  88
  89         /*
  90          * We need to check for kernel oplocks before going into the select
  91          * here, as the EINTR generated by the linux kernel oplock may have
  92          * already been eaten. JRA.
  93          */
  94
  95         if (koplocks && koplocks->msg_waiting(&fds)) {
  96                 return koplocks->receive_message(&fds, buffer, buffer_len);
  97         }
  98
  99         while (timeout > 0 && selrtn == -1) {
 100                 struct timeval to;
 101                 int maxfd = oplock_sock;
 102                 time_t starttime = time(NULL);
 103
 104                 FD_ZERO(&fds);
 105                 maxfd = setup_oplock_select_set(&fds);
 106
 107                 to.tv_sec = timeout / 1000;
 108                 to.tv_usec = (timeout % 1000) * 1000;
 109
 110                 DEBUG(5,("receive_local_message: doing select with timeout of %d ms\n", timeout));
 111
 112                 selrtn = sys_select(maxfd+1,&fds,NULL,NULL,&to);
 113
 114                 if (selrtn == -1 && errno == EINTR) {
 115
 116                         /* could be a kernel oplock interrupt */
 117                         if (koplocks && koplocks->msg_waiting(&fds)) {
 118                                 return koplocks->receive_message(&fds, buffer, buffer_len);
 119                         }
 120
 121                         /*
 122                          * Linux 2.0.x seems to have a bug in that
 123                          * it can return -1, EINTR with a timeout of zero.
 124                          * Make sure we bail out here with a read timeout
 125                          * if we got EINTR on a timeout of 1 or less.
 126                          */
 127
 128                         if (timeout <= 1) {
 129                                 smb_read_error = READ_TIMEOUT;
 130                                 return False;
 131                         }
 132
 133                         /* Not a kernel interrupt - could be a SIGUSR1 message. We must restart. */
 134                         /* We need to decrement the timeout here. */
 135                         timeout -= ((time(NULL) - starttime)*1000);
 136                         if (timeout < 0)
 137                                 timeout = 1;
 138
 139                         DEBUG(5,("receive_local_message: EINTR : new timeout %d ms\n", timeout));
 140                         continue;
 141                 }
 142
 143                 /* Check if error */
 144                 if(selrtn == -1) {
 145                         /* something is wrong. Maybe the socket is dead? */
 146                         smb_read_error = READ_ERROR;
 147                         return False;
 148                 }
 149
 150                 /* Did we timeout ? */
 151                 if (selrtn == 0) {
 152                         smb_read_error = READ_TIMEOUT;
 153                         return False;
 154                 }
 155         }
 156
 157         if (koplocks && koplocks->msg_waiting(&fds)) {
 158                 return koplocks->receive_message(&fds, buffer, buffer_len);
 159         }
 160
 161         if (!FD_ISSET(oplock_sock, &fds))
 162                 return False;
 163
 164         /*
 165          * From here down we deal with the smbd <--> smbd
 166          * oplock break protocol only.
 167          */
 168
 169         /*
 170          * Read a loopback udp message.
 171          */
 172         msg_len = sys_recvfrom(oplock_sock, &buffer[OPBRK_CMD_HEADER_LEN],
 173                                                 buffer_len - OPBRK_CMD_HEADER_LEN, 0, (struct sockaddr *)&from, &fromlen);
 174
 175         if(msg_len < 0) {
 176                 DEBUG(0,("receive_local_message. Error in recvfrom. (%s).\n",strerror(errno)));
 177                 return False;
 178         }
 179
 180         /* Validate message length. */
 181         if(msg_len > (buffer_len - OPBRK_CMD_HEADER_LEN)) {
 182                 DEBUG(0,("receive_local_message: invalid msg_len (%d) max can be %d\n", msg_len,
 183                         buffer_len  - OPBRK_CMD_HEADER_LEN));
 184                 return False;
 185         }
 186
 187         /* Validate message from address (must be localhost). */
 188         if(from.sin_addr.s_addr != htonl(INADDR_LOOPBACK)) {
 189                 DEBUG(0,("receive_local_message: invalid 'from' address \
 190 (was %lx should be 127.0.0.1)\n", (long)from.sin_addr.s_addr));
 191                 return False;
 192         }
 193
 194         /* Setup the message header */
 195         SIVAL(buffer,OPBRK_CMD_LEN_OFFSET,msg_len);
 196         SSVAL(buffer,OPBRK_CMD_PORT_OFFSET,ntohs(from.sin_port));
 197
 198         return True;
 199 }
 200
 201 /****************************************************************************
 202  Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
 203  disabled (just sets flags). Returns True if oplock set.
 204 ****************************************************************************/
 205
 206 BOOL set_file_oplock(files_struct *fsp, int oplock_type)
 207 {
 208         if (koplocks && !koplocks->set_oplock(fsp, oplock_type))
 209                 return False;
 210
 211         fsp->oplock_type = oplock_type;
 212         fsp->sent_oplock_break = NO_BREAK_SENT;
 213         if (oplock_type == LEVEL_II_OPLOCK)
 214                 level_II_oplocks_open++;
 215         else
 216                 exclusive_oplocks_open++;
 217
 218         DEBUG(5,("set_file_oplock: granted oplock on file %s, dev = %x, inode = %.0f, file_id = %lu, \
 219 tv_sec = %x, tv_usec = %x\n",
 220                  fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id,
 221                  (int)fsp->open_time.tv_sec, (int)fsp->open_time.tv_usec ));
 222
 223         return True;
 224 }
 225
 226 /****************************************************************************
 227  Attempt to release an oplock on a file. Decrements oplock count.
 228 ****************************************************************************/
 229
 230 void release_file_oplock(files_struct *fsp)
 231 {
 232         if ((fsp->oplock_type != NO_OPLOCK) && koplocks)
 233                 koplocks->release_oplock(fsp);
 234
 235         if (fsp->oplock_type == LEVEL_II_OPLOCK)
 236                 level_II_oplocks_open--;
 237         else if (fsp->oplock_type)
 238                 exclusive_oplocks_open--;
 239
 240         fsp->oplock_type = NO_OPLOCK;
 241         fsp->sent_oplock_break = NO_BREAK_SENT;
 242
 243         flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
 244 }
 245
 246 /****************************************************************************
 247  Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
 248 ****************************************************************************/
 249
 250 static void downgrade_file_oplock(files_struct *fsp)
 251 {
 252         if (koplocks)
 253                 koplocks->release_oplock(fsp);
 254         fsp->oplock_type = LEVEL_II_OPLOCK;
 255         exclusive_oplocks_open--;
 256         level_II_oplocks_open++;
 257         fsp->sent_oplock_break = NO_BREAK_SENT;
 258 }
 259
 260 /****************************************************************************
 261  Remove a file oplock. Copes with level II and exclusive.
 262  Locks then unlocks the share mode lock. Client can decide to go directly
 263  to none even if a "break-to-level II" was sent.
 264 ****************************************************************************/
 265
 266 BOOL remove_oplock(files_struct *fsp, BOOL break_to_none)
 267 {
 268         SMB_DEV_T dev = fsp->dev;
 269         SMB_INO_T inode = fsp->inode;
 270         BOOL ret = True;
 271
 272         /* Remove the oplock flag from the sharemode. */
 273         if (lock_share_entry_fsp(fsp) == False) {
 274                 DEBUG(0,("remove_oplock: failed to lock share entry for file %s\n",
 275                          fsp->fsp_name ));
 276                 return False;
 277         }
 278
 279         if (fsp->sent_oplock_break == BREAK_TO_NONE_SENT || break_to_none) {
 280                 /*
 281                  * Deal with a reply when a break-to-none was sent.
 282                  */
 283
 284                 if(remove_share_oplock(fsp)==False) {
 285                         DEBUG(0,("remove_oplock: failed to remove share oplock for file %s fnum %d, \
 286 dev = %x, inode = %.0f\n", fsp->fsp_name, fsp->fnum, (unsigned int)dev, (double)inode));
 287                         ret = False;
 288                 }
 289
 290                 release_file_oplock(fsp);
 291         } else {
 292                 /*
 293                  * Deal with a reply when a break-to-level II was sent.
 294                  */
 295                 if(downgrade_share_oplock(fsp)==False) {
 296                         DEBUG(0,("remove_oplock: failed to downgrade share oplock for file %s fnum %d, \
 297 dev = %x, inode = %.0f\n", fsp->fsp_name, fsp->fnum, (unsigned int)dev, (double)inode));
 298                         ret = False;
 299                 }
 300
 301                 downgrade_file_oplock(fsp);
 302         }
 303
 304         unlock_share_entry_fsp(fsp);
 305         return ret;
 306 }
 307
 308 /****************************************************************************
 309  Setup the listening set of file descriptors for an oplock break
 310  message either from the UDP socket or from the kernel. Returns the maximum
 311  fd used.
 312 ****************************************************************************/
 313
 314 int setup_oplock_select_set( fd_set *fds)
 315 {
 316         int maxfd = oplock_sock;
 317
 318         if(oplock_sock == -1)
 319                 return 0;
 320
 321         FD_SET(oplock_sock,fds);
 322
 323         if (koplocks && koplocks->notification_fd != -1) {
 324                 FD_SET(koplocks->notification_fd, fds);
 325                 maxfd = MAX(maxfd, koplocks->notification_fd);
 326         }
 327
 328         return maxfd;
 329 }
 330
 331 /****************************************************************************
 332  Process an oplock break message - whether it came from the UDP socket
 333  or from the kernel.
 334 ****************************************************************************/
 335
 336 BOOL process_local_message(char *buffer, int buf_size)
 337 {
 338         int32 msg_len;
 339         uint16 from_port;
 340         char *msg_start;
 341         pid_t remotepid;
 342         SMB_DEV_T dev;
 343         SMB_INO_T inode;
 344         unsigned long file_id;
 345         uint16 break_cmd_type;
 346         struct sockaddr_in toaddr;
 347
 348         msg_len = IVAL(buffer,OPBRK_CMD_LEN_OFFSET);
 349         from_port = SVAL(buffer,OPBRK_CMD_PORT_OFFSET);
 350
 351         msg_start = &buffer[OPBRK_CMD_HEADER_LEN];
 352
 353         DEBUG(5,("process_local_message: Got a message of length %d from port (%d)\n",
 354                 msg_len, from_port));
 355
 356         /*
 357          * Pull the info out of the requesting packet.
 358          */
 359
 360         break_cmd_type = SVAL(msg_start,OPBRK_MESSAGE_CMD_OFFSET);
 361
 362         switch(break_cmd_type) {
 363                 case KERNEL_OPLOCK_BREAK_CMD:
 364                         if (!koplocks) {
 365                                 DEBUG(0,("unexpected kernel oplock break!\n"));
 366                                 break;
 367                         }
 368                         if (!koplocks->parse_message(msg_start, msg_len, &inode, &dev, &file_id)) {
 369                                 DEBUG(0,("kernel oplock break parse failure!\n"));
 370                                 return False;
 371                         }
 372                         break;
 373
 374                 case OPLOCK_BREAK_CMD:
 375                 case LEVEL_II_OPLOCK_BREAK_CMD:
 376                 case ASYNC_LEVEL_II_OPLOCK_BREAK_CMD:
 377
 378                         /* Ensure that the msg length is correct. */
 379                         if(msg_len != OPLOCK_BREAK_MSG_LEN) {
 380                                 DEBUG(0,("process_local_message: incorrect length for OPLOCK_BREAK_CMD (was %d, should be %d).\n",
 381                                         (int)msg_len, (int)OPLOCK_BREAK_MSG_LEN));
 382                                 return False;
 383                         }
 384
 385                         memcpy((char *)&remotepid, msg_start+OPLOCK_BREAK_PID_OFFSET,sizeof(remotepid));
 386                         memcpy((char *)&inode, msg_start+OPLOCK_BREAK_INODE_OFFSET,sizeof(inode));
 387                         memcpy((char *)&dev, msg_start+OPLOCK_BREAK_DEV_OFFSET,sizeof(dev));
 388                         memcpy((char *)&file_id, msg_start+OPLOCK_BREAK_FILEID_OFFSET,sizeof(file_id));
 389
 390                         DEBUG(5,("process_local_message: (%s) oplock break request from \
 391 pid %d, port %d, dev = %x, inode = %.0f, file_id = %lu\n",
 392                                 (break_cmd_type == OPLOCK_BREAK_CMD) ? "exclusive" : "level II",
 393                                 (int)remotepid, from_port, (unsigned int)dev, (double)inode, file_id));
 394                         break;
 395
 396                 case RETRY_DEFERRED_OPEN_CMD:
 397
 398                         /* Request to retry and open that would return SHARING_VIOLATION. */
 399                         if (msg_len != DEFERRED_OPEN_MSG_LEN) {
 400                                 DEBUG(0,("process_local_message: incorrect length for RETRY_DEFERRED_OPEN_CMD (was %d, should be %d).\n",
 401                                         (int)msg_len, (int)DEFERRED_OPEN_MSG_LEN));
 402                                 return False;
 403                         }
 404                         {
 405                                 uint16 mid;
 406
 407                                 memcpy((char *)&remotepid, msg_start+DEFERRED_OPEN_PID_OFFSET,sizeof(remotepid));
 408                                 memcpy((char *)&inode, msg_start+DEFERRED_OPEN_INODE_OFFSET,sizeof(inode));
 409                                 memcpy((char *)&dev, msg_start+DEFERRED_OPEN_DEV_OFFSET,sizeof(dev));
 410                                 memcpy((char *)&mid, msg_start+DEFERRED_OPEN_MID_OFFSET,sizeof(mid));
 411
 412                                 DEBUG(5,("process_local_message: RETRY_DEFERRED_OPEN from \
 413 pid %d, port %d, dev = %x, inode = %.0f, mid = %u\n",
 414                                         (int)remotepid, from_port, (unsigned int)dev, (double)inode, (unsigned int)mid));
 415
 416                                 schedule_sharing_violation_open_smb_message(mid);
 417                         }
 418                         return True;
 419
 420                 /*
 421                  * Keep this as a debug case - eventually we can remove it.
 422                  */
 423                 case 0x8001:
 424                         DEBUG(0,("process_local_message: Received unsolicited break \
 425 reply - dumping info.\n"));
 426
 427                         if(msg_len != OPLOCK_BREAK_MSG_LEN) {
 428                                 DEBUG(0,("process_local_message: ubr: incorrect length for reply \
 429 (was %d, should be %d).\n", (int)msg_len, (int)OPLOCK_BREAK_MSG_LEN));
 430                                 return False;
 431                         }
 432
 433                         memcpy((char *)&inode, msg_start+OPLOCK_BREAK_INODE_OFFSET,sizeof(inode));
 434                         memcpy((char *)&remotepid, msg_start+OPLOCK_BREAK_PID_OFFSET,sizeof(remotepid));
 435                         memcpy((char *)&dev, msg_start+OPLOCK_BREAK_DEV_OFFSET,sizeof(dev));
 436                         memcpy((char *)&file_id, msg_start+OPLOCK_BREAK_FILEID_OFFSET,sizeof(file_id));
 437
 438                         DEBUG(0,("process_local_message: unsolicited oplock break reply from \
 439 pid %d, port %d, dev = %x, inode = %.0f, file_id = %lu\n",
 440                                 (int)remotepid, from_port, (unsigned int)dev, (double)inode, file_id));
 441
 442                         return False;
 443
 444                 default:
 445                         DEBUG(0,("process_local_message: unknown UDP message command code (%x) - ignoring.\n",
 446                                 (unsigned int)SVAL(msg_start,0)));
 447                         return False;
 448         }
 449
 450         /*
 451          * Now actually process the break request.
 452          */
 453
 454         if ((exclusive_oplocks_open == 0) &&
 455             (level_II_oplocks_open == 0)) {
 456                 /*
 457                  * If we have no record of any currently open oplocks,
 458                  * it's not an error, as a close command may have
 459                  * just been issued on the file that was oplocked.
 460                  * Just log a message and return success in this case.
 461                  */
 462                 DEBUG(3,("process_local_message: oplock break requested with "
 463                          "no outstanding oplocks. Returning success.\n"));
 464                 return True;
 465         }
 466
 467         if (!oplock_break(dev, inode, file_id, False)) {
 468                 DEBUG(0,("process_local_message: oplock break failed.\n"));
 469                 return False;
 470         }
 471
 472         /*
 473          * Do the appropriate reply - none in the kernel or async level II
 474          * case.
 475          */
 476
 477         if (!((break_cmd_type == OPLOCK_BREAK_CMD) ||
 478               (break_cmd_type == LEVEL_II_OPLOCK_BREAK_CMD))) {
 479                 return True;
 480         }
 481
 482         /* Send the message back after OR'ing in the 'REPLY' bit. */
 483         SSVAL(msg_start,OPBRK_MESSAGE_CMD_OFFSET,break_cmd_type | CMD_REPLY);
 484
 485         memset((char *)&toaddr,'\0',sizeof(toaddr));
 486         toaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 487         toaddr.sin_port = htons(from_port);
 488         toaddr.sin_family = AF_INET;
 489
 490         if(sys_sendto( oplock_sock, msg_start, OPLOCK_BREAK_MSG_LEN, 0,
 491                        (struct sockaddr *)&toaddr, sizeof(toaddr)) < 0) {
 492                 DEBUG(0,("process_local_message: sendto process %d failed. "
 493                          "Errno was %s\n", (int)remotepid, strerror(errno)));
 494                 return False;
 495         }
 496
 497         DEBUG(5,("process_local_message: oplock break reply sent to pid %d, "
 498                  "port %d, for file dev = %x, inode = %.0f, file_id = %lu\n",
 499                  (int)remotepid, from_port, (unsigned int)dev,
 500                  (double)inode, file_id));
 501
 502         return True;
 503 }
 504
 505 /****************************************************************************
 506  Set up an oplock break message.
 507 ****************************************************************************/
 508
 509 static void prepare_break_message(char *outbuf, files_struct *fsp, BOOL level2)
 510 {
 511         memset(outbuf,'\0',smb_size);
 512         set_message(outbuf,8,0,True);
 513
 514         SCVAL(outbuf,smb_com,SMBlockingX);
 515         SSVAL(outbuf,smb_tid,fsp->conn->cnum);
 516         SSVAL(outbuf,smb_pid,0xFFFF);
 517         SSVAL(outbuf,smb_uid,0);
 518         SSVAL(outbuf,smb_mid,0xFFFF);
 519         SCVAL(outbuf,smb_vwv0,0xFF);
 520         SSVAL(outbuf,smb_vwv2,fsp->fnum);
 521         SCVAL(outbuf,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
 522         SCVAL(outbuf,smb_vwv3+1,level2 ? OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
 523 }
 524
 525 /****************************************************************************
 526  Function to do the waiting before sending a local break.
 527 ****************************************************************************/
 528
 529 static void wait_before_sending_break(void)
 530 {
 531         struct timeval cur_tv;
 532         long wait_left = (long)lp_oplock_break_wait_time();
 533
 534         if (wait_left == 0)
 535                 return;
 536
 537         GetTimeOfDay(&cur_tv);
 538
 539         wait_left -= ((cur_tv.tv_sec - smb_last_time.tv_sec)*1000) +
 540                 ((cur_tv.tv_usec - smb_last_time.tv_usec)/1000);
 541
 542         if(wait_left > 0) {
 543                 wait_left = MIN(wait_left, 1000);
 544                 sys_usleep(wait_left * 1000);
 545         }
 546 }
 547
 548 /****************************************************************************
 549  Ensure that we have a valid oplock.
 550 ****************************************************************************/
 551
 552 static files_struct *initial_break_processing(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
 553 {
 554         files_struct *fsp = NULL;
 555
 556         if( DEBUGLVL( 3 ) ) {
 557                 dbgtext( "initial_break_processing: called for dev = %x, inode = %.0f file_id = %lu\n",
 558                         (unsigned int)dev, (double)inode, file_id);
 559                 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
 560                         exclusive_oplocks_open, level_II_oplocks_open );
 561         }
 562
 563         /*
 564          * We need to search the file open table for the
 565          * entry containing this dev and inode, and ensure
 566          * we have an oplock on it.
 567          */
 568
 569         fsp = file_find_dif(dev, inode, file_id);
 570
 571         if(fsp == NULL) {
 572                 /* The file could have been closed in the meantime - return success. */
 573                 if( DEBUGLVL( 3 ) ) {
 574                         dbgtext( "initial_break_processing: cannot find open file with " );
 575                         dbgtext( "dev = %x, inode = %.0f file_id = %lu", (unsigned int)dev,
 576                                 (double)inode, file_id);
 577                         dbgtext( "allowing break to succeed.\n" );
 578                 }
 579                 return NULL;
 580         }
 581
 582         /* Ensure we have an oplock on the file */
 583
 584         /*
 585          * There is a potential race condition in that an oplock could
 586          * have been broken due to another udp request, and yet there are
 587          * still oplock break messages being sent in the udp message
 588          * queue for this file. So return true if we don't have an oplock,
 589          * as we may have just freed it.
 590          */
 591
 592         if(fsp->oplock_type == NO_OPLOCK) {
 593                 if( DEBUGLVL( 3 ) ) {
 594                         dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
 595                         dbgtext( "(dev = %x, inode = %.0f, file_id = %lu) has no oplock.\n",
 596                                 (unsigned int)dev, (double)inode, fsp->file_id );
 597                         dbgtext( "Allowing break to succeed regardless.\n" );
 598                 }
 599                 return NULL;
 600         }
 601
 602         return fsp;
 603 }
 604
 605 /****************************************************************************
 606  Process a level II oplock break directly.
 607  We must call this function with the share mode entry locked.
 608 ****************************************************************************/
 609
 610 static BOOL oplock_break_level2(files_struct *fsp, BOOL local_request)
 611 {
 612         char outbuf[128];
 613         SMB_DEV_T dev = fsp->dev;
 614         SMB_INO_T inode = fsp->inode;
 615
 616         /*
 617          * We can have a level II oplock even if the client is not
 618          * level II oplock aware. In this case just remove the
 619          * flags and don't send the break-to-none message to
 620          * the client.
 621          */
 622
 623         if (global_client_caps & CAP_LEVEL_II_OPLOCKS) {
 624                 BOOL sign_state;
 625
 626                 /*
 627                  * If we are sending an oplock break due to an SMB sent
 628                  * by our own client we ensure that we wait at leat
 629                  * lp_oplock_break_wait_time() milliseconds before sending
 630                  * the packet. Sending the packet sooner can break Win9x
 631                  * and has reported to cause problems on NT. JRA.
 632                  */
 633
 634                 if (local_request) {
 635                         wait_before_sending_break();
 636                 }
 637
 638                 /* Prepare the SMBlockingX message. */
 639                 prepare_break_message( outbuf, fsp, False);
 640
 641                 /* Save the server smb signing state. */
 642                 sign_state = srv_oplock_set_signing(False);
 643
 644                 show_msg(outbuf);
 645                 if (!send_smb(smbd_server_fd(), outbuf))
 646                         exit_server("oplock_break_level2: send_smb failed.");
 647
 648                 /* Restore the sign state to what it was. */
 649                 srv_oplock_set_signing(sign_state);
 650         }
 651
 652         /*
 653          * Now we must update the shared memory structure to tell
 654          * everyone else we no longer have a level II oplock on
 655          * this open file. We must call this function with the share mode
 656          * entry locked so we can change the entry directly.
 657          */
 658
 659         if(remove_share_oplock(fsp)==False) {
 660                 DEBUG(0,("oplock_break_level2: unable to remove level II oplock for file %s\n", fsp->fsp_name ));
 661         }
 662
 663         release_file_oplock(fsp);
 664
 665         if(level_II_oplocks_open < 0) {
 666                 DEBUG(0,("oplock_break_level2: level_II_oplocks_open < 0 (%d). PANIC ERROR\n",
 667                         level_II_oplocks_open));
 668                 abort();
 669         }
 670
 671         if( DEBUGLVL( 3 ) ) {
 672                 dbgtext( "oplock_break_level2: returning success for " );
 673                 dbgtext( "dev = %x, inode = %.0f, file_id = %lu\n", (unsigned int)dev, (double)inode, fsp->file_id );
 674                 dbgtext( "Current level II oplocks_open = %d\n", level_II_oplocks_open );
 675         }
 676
 677         return True;
 678 }
 679
 680 /****************************************************************************
 681  Process an oplock break directly.
 682  This is always called with the share mode lock *NOT* held.
 683 ****************************************************************************/
 684
 685 static BOOL oplock_break(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id, BOOL local_request)
 686 {
 687         char *inbuf = NULL;
 688         char *saved_inbuf = NULL;
 689         char *outbuf = NULL;
 690         char *saved_outbuf = NULL;
 691         files_struct *fsp = NULL;
 692         time_t start_time;
 693         BOOL shutdown_server = False;
 694         BOOL oplock_timeout = False;
 695         BOOL sign_state;
 696         connection_struct *saved_user_conn;
 697         connection_struct *saved_fsp_conn;
 698         int saved_vuid;
 699         pstring saved_dir;
 700         int timeout = (OPLOCK_BREAK_TIMEOUT * 1000);
 701         pstring file_name;
 702         BOOL using_levelII;
 703
 704         if((fsp = initial_break_processing(dev, inode, file_id)) == NULL)
 705                 return True;
 706
 707         /*
 708          * Deal with a level II oplock going break to none separately.
 709          */
 710
 711         if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type)) {
 712                 BOOL ret;
 713                 /* We must always call oplock_break_level2() with
 714                    the share mode entry locked. */
 715                 if (lock_share_entry_fsp(fsp) == False) {
 716                         DEBUG(0,("oplock_break: unable to lock share entry for file %s\n", fsp->fsp_name ));
 717                         return False;
 718                 }
 719                 ret = oplock_break_level2(fsp, local_request);
 720                 unlock_share_entry_fsp(fsp);
 721                 return ret;
 722         }
 723
 724         /* Mark the oplock break as sent - we don't want to send twice! */
 725         if (fsp->sent_oplock_break) {
 726                 if( DEBUGLVL( 0 ) ) {
 727                         dbgtext( "oplock_break: ERROR: oplock_break already sent for " );
 728                         dbgtext( "file %s ", fsp->fsp_name);
 729                         dbgtext( "(dev = %x, inode = %.0f, file_id = %lu)\n", (unsigned int)dev, (double)inode, fsp->file_id );
 730                 }
 731
 732                 /*
 733                  * We have to fail the open here as we cannot send another oplock break on
 734                  * this file whilst we are awaiting a response from the client - neither
 735                  * can we allow another open to succeed while we are waiting for the client.
 736                  */
 737                 return False;
 738         }
 739
 740         if(global_oplock_break) {
 741                 DEBUG(0,("ABORT : ABORT : recursion in oplock_break !!!!!\n"));
 742                 abort();
 743         }
 744
 745         /*
 746          * Now comes the horrid part. We must send an oplock break to the client,
 747          * and then process incoming messages until we get a close or oplock release.
 748          * At this point we know we need a new inbuf/outbuf buffer pair.
 749          * We cannot use these staticaly as we may recurse into here due to
 750          * messages crossing on the wire.
 751          */
 752
 753         if((inbuf = NewInBuffer(&saved_inbuf))==NULL) {
 754                 DEBUG(0,("oplock_break: malloc fail for input buffer.\n"));
 755                 return False;
 756         }
 757
 758         if((outbuf = NewOutBuffer(&saved_outbuf))==NULL) {
 759                 DEBUG(0,("oplock_break: malloc fail for output buffer.\n"));
 760                 set_InBuffer(saved_inbuf);
 761                 free_InBuffer(inbuf);
 762                 return False;
 763         }
 764
 765         /*
 766          * If we are sending an oplock break due to an SMB sent
 767          * by our own client we ensure that we wait at leat
 768          * lp_oplock_break_wait_time() milliseconds before sending
 769          * the packet. Sending the packet sooner can break Win9x
 770          * and has reported to cause problems on NT. JRA.
 771          */
 772
 773         if (local_request) {
 774                 wait_before_sending_break();
 775         }
 776
 777         /* Prepare the SMBlockingX message. */
 778
 779         if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
 780                         !koplocks && /* NOTE: we force levelII off for kernel oplocks - this will change when it is supported */
 781                         lp_level2_oplocks(SNUM(fsp->conn))) {
 782                 using_levelII = True;
 783         } else {
 784                 using_levelII = False;
 785         }
 786
 787         prepare_break_message( outbuf, fsp, using_levelII);
 788         /* Remember if we just sent a break to level II on this file. */
 789         fsp->sent_oplock_break = using_levelII? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
 790
 791         /* Save the server smb signing state. */
 792         sign_state = srv_oplock_set_signing(False);
 793
 794         show_msg(outbuf);
 795         if (!send_smb(smbd_server_fd(), outbuf)) {
 796                 srv_oplock_set_signing(sign_state);
 797                 exit_server("oplock_break: send_smb failed.");
 798         }
 799
 800         /* Restore the sign state to what it was. */
 801         srv_oplock_set_signing(sign_state);
 802
 803         /* We need this in case a readraw crosses on the wire. */
 804         global_oplock_break = True;
 805
 806         /* Process incoming messages. */
 807
 808         /*
 809          * JRA - If we don't get a break from the client in OPLOCK_BREAK_TIMEOUT
 810          * seconds we should just die....
 811          */
 812
 813         start_time = time(NULL);
 814
 815         /*
 816          * Save the information we need to re-become the
 817          * user, then unbecome the user whilst we're doing this.
 818          */
 819         saved_user_conn = current_user.conn;
 820         saved_vuid = current_user.vuid;
 821         saved_fsp_conn = fsp->conn;
 822         /*
 823          * Initialize saved_dir to something sensible: vfs_GetWd may not work well
 824          * for root: the directory may be NFS-mounted and exported with root_squash
 825          * (so has no root access).
 826          */
 827         pstrcpy(saved_dir,saved_fsp_conn->connectpath);
 828         vfs_GetWd(saved_fsp_conn,saved_dir);
 829         /* Save the chain fnum. */
 830         file_chain_save();
 831
 832         pstrcpy(file_name, fsp->fsp_name);
 833
 834         change_to_root_user();
 835
 836         /*
 837          * From Charles Hoch <hoch@exemplary.com>. If the break processing
 838          * code closes the file (as it often does), then the fsp pointer here
 839          * points to free()'d memory. We *must* revalidate fsp each time
 840          * around the loop. With async I/O, write calls may steal the global InBuffer,
 841          * so ensure we're using the correct one each time around the loop.
 842          */
 843
 844         while((fsp = initial_break_processing(dev, inode, file_id)) &&
 845                         OPEN_FSP(fsp) && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 846
 847                 inbuf = get_InBuffer();
 848                 outbuf = get_OutBuffer();
 849
 850                 if(receive_smb(smbd_server_fd(),inbuf, timeout) == False) {
 851                         /*
 852                          * Die if we got an error.
 853                          */
 854
 855                         if (smb_read_error == READ_EOF) {
 856                                 DEBUG( 0, ( "oplock_break: end of file from client\n" ) );
 857                                 shutdown_server = True;
 858                         } else if (smb_read_error == READ_ERROR) {
 859                                 DEBUG( 0, ("oplock_break: receive_smb error (%s)\n", strerror(errno)) );
 860                                 shutdown_server = True;
 861                         } else if (smb_read_error == READ_BAD_SIG) {
 862                                 DEBUG( 0, ("oplock_break: bad signature from client\n" ));
 863                                 shutdown_server = True;
 864                         } else if (smb_read_error == READ_TIMEOUT) {
 865                                 DEBUG( 0, ( "oplock_break: receive_smb timed out after %d seconds.\n", OPLOCK_BREAK_TIMEOUT ) );
 866                                 oplock_timeout = True;
 867                         }
 868
 869                         DEBUGADD( 0, ( "oplock_break failed for file %s ", file_name ) );
 870                         DEBUGADD( 0, ( "(dev = %x, inode = %.0f, file_id = %lu).\n",
 871                                 (unsigned int)dev, (double)inode, file_id));
 872
 873                         break;
 874                 }
 875
 876                 /*
 877                  * There are certain SMB requests that we shouldn't allow
 878                  * to recurse. opens, renames and deletes are the obvious
 879                  * ones. This is handled in the switch_message() function.
 880                  * If global_oplock_break is set they will push the packet onto
 881                  * the pending smb queue and return -1 (no reply).
 882                  * JRA.
 883                  */
 884
 885                 process_smb(inbuf, outbuf);
 886
 887                 /*
 888                  * Die if we go over the time limit.
 889                  */
 890
 891                 if((time(NULL) - start_time) > OPLOCK_BREAK_TIMEOUT) {
 892                         if( DEBUGLVL( 0 ) ) {
 893                                 dbgtext( "oplock_break: no break received from client " );
 894                                 dbgtext( "within %d seconds.\n", OPLOCK_BREAK_TIMEOUT );
 895                                 dbgtext( "oplock_break failed for file %s ", fsp->fsp_name );
 896                                 dbgtext( "(dev = %x, inode = %.0f, file_id = %lu).\n",
 897                                         (unsigned int)dev, (double)inode, file_id );
 898                         }
 899                         oplock_timeout = True;
 900                         break;
 901                 }
 902         }
 903
 904         /*
 905          * Go back to being the user who requested the oplock
 906          * break.
 907          */
 908         if((saved_user_conn != NULL) && (saved_vuid != UID_FIELD_INVALID) && !change_to_user(saved_user_conn, saved_vuid)) {
 909                 DEBUG( 0, ( "oplock_break: unable to re-become user!" ) );
 910                 DEBUGADD( 0, ( "Shutting down server\n" ) );
 911                 close(oplock_sock);
 912                 exit_server("unable to re-become user");
 913         }
 914
 915         /* Including the directory. */
 916         vfs_ChDir(saved_fsp_conn,saved_dir);
 917
 918         /* Restore the chain fnum. */
 919         file_chain_restore();
 920
 921         /* Restore the global In/Out buffers. */
 922         set_InBuffer(saved_inbuf);
 923         set_OutBuffer(saved_outbuf);
 924
 925         /* Free the buffers we've been using to recurse. */
 926         free_InBuffer(inbuf);
 927         free_OutBuffer(outbuf);
 928
 929         /* We need this in case a readraw crossed on the wire. */
 930         if(global_oplock_break)
 931                 global_oplock_break = False;
 932
 933         /*
 934          * If the client timed out then clear the oplock (or go to level II)
 935          * and continue. This seems to be what NT does and is better than dropping
 936          * the connection.
 937          */
 938
 939         if(oplock_timeout && (fsp = initial_break_processing(dev, inode, file_id)) &&
 940                         OPEN_FSP(fsp) && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 941                 DEBUG(0,("oplock_break: client failure in oplock break in file %s\n", fsp->fsp_name));
 942                 remove_oplock(fsp,True);
 943 #if FASCIST_OPLOCK_BACKOFF
 944                 global_client_failed_oplock_break = True; /* Never grant this client an oplock again. */
 945 #endif
 946         }
 947
 948         /*
 949          * If the client had an error we must die.
 950          */
 951
 952         if(shutdown_server) {
 953                 DEBUG( 0, ( "oplock_break: client failure in break - " ) );
 954                 DEBUGADD( 0, ( "shutting down this smbd.\n" ) );
 955                 close(oplock_sock);
 956                 exit_server("oplock break failure");
 957         }
 958
 959         /* Santity check - remove this later. JRA */
 960         if(exclusive_oplocks_open < 0) {
 961                 DEBUG(0,("oplock_break: exclusive_oplocks_open < 0 (%d). PANIC ERROR\n", exclusive_oplocks_open));
 962                 abort();
 963         }
 964
 965         /* We know we have no saved errors here. */
 966         set_saved_error_triple(0, 0, NT_STATUS_OK);
 967
 968         if( DEBUGLVL( 3 ) ) {
 969                 dbgtext( "oplock_break: returning success for " );
 970                 dbgtext( "dev = %x, inode = %.0f, file_id = %lu\n", (unsigned int)dev, (double)inode, file_id );
 971                 dbgtext( "Current exclusive_oplocks_open = %d\n", exclusive_oplocks_open );
 972         }
 973
 974         return True;
 975 }
 976
 977 /****************************************************************************
 978  Send an oplock break message to another smbd process. If the oplock is held
 979  by the local smbd then call the oplock break function directly.
 980  This function is called with no share locks held.
 981 ****************************************************************************/
 982
 983 BOOL request_oplock_break(share_mode_entry *share_entry)
 984 {
 985         char op_break_msg[OPLOCK_BREAK_MSG_LEN];
 986         struct sockaddr_in addr_out;
 987         pid_t pid = sys_getpid();
 988         time_t start_time;
 989         int time_left;
 990         SMB_DEV_T dev = share_entry->dev;
 991         SMB_INO_T inode = share_entry->inode;
 992         unsigned long file_id = share_entry->share_file_id;
 993         uint16 break_cmd_type;
 994
 995         if(pid == share_entry->pid) {
 996                 /* We are breaking our own oplock, make sure it's us. */
 997                 if(share_entry->op_port != global_oplock_port) {
 998                         DEBUG(0,("request_oplock_break: corrupt share mode entry - pid = %d, port = %d \
 999 should be %d\n", (int)pid, share_entry->op_port, global_oplock_port));
1000                         return False;
1001                 }
1002
1003                 DEBUG(5,("request_oplock_break: breaking our own oplock\n"));
1004
1005 #if 1 /* JRA PARANOIA TEST.... */
1006                 {
1007                         files_struct *fsp = file_find_dif(dev, inode, file_id);
1008                         if (!fsp) {
1009                                 DEBUG(0,("request_oplock_break: PANIC : breaking our own oplock requested for \
1010 dev = %x, inode = %.0f, file_id = %lu and no fsp found !\n",
1011             (unsigned int)dev, (double)inode, file_id ));
1012                                 smb_panic("request_oplock_break: no fsp found for our own oplock\n");
1013                         }
1014                 }
1015 #endif /* END JRA PARANOIA TEST... */
1016
1017                 /* Call oplock break direct. */
1018                 return oplock_break(dev, inode, file_id, True);
1019         }
1020
1021         /* We need to send a OPLOCK_BREAK_CMD message to the port in the share mode entry. */
1022
1023         if (LEVEL_II_OPLOCK_TYPE(share_entry->op_type)) {
1024                 break_cmd_type = LEVEL_II_OPLOCK_BREAK_CMD;
1025         } else {
1026                 break_cmd_type = OPLOCK_BREAK_CMD;
1027         }
1028
1029         SSVAL(op_break_msg,OPBRK_MESSAGE_CMD_OFFSET,break_cmd_type);
1030         memcpy(op_break_msg+OPLOCK_BREAK_PID_OFFSET,(char *)&pid,sizeof(pid));
1031         memcpy(op_break_msg+OPLOCK_BREAK_DEV_OFFSET,(char *)&dev,sizeof(dev));
1032         memcpy(op_break_msg+OPLOCK_BREAK_INODE_OFFSET,(char *)&inode,sizeof(inode));
1033         memcpy(op_break_msg+OPLOCK_BREAK_FILEID_OFFSET,(char *)&file_id,sizeof(file_id));
1034
1035         /* Set the address and port. */
1036         memset((char *)&addr_out,'\0',sizeof(addr_out));
1037         addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1038         addr_out.sin_port = htons( share_entry->op_port );
1039         addr_out.sin_family = AF_INET;
1040
1041         if( DEBUGLVL( 3 ) ) {
1042                 dbgtext( "request_oplock_break: sending a synchronous oplock break message to " );
1043                 dbgtext( "pid %d on port %d ", (int)share_entry->pid, share_entry->op_port );
1044                 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1045             (unsigned int)dev, (double)inode, file_id );
1046         }
1047
1048         if(sys_sendto(oplock_sock,op_break_msg,OPLOCK_BREAK_MSG_LEN,0,
1049                         (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0) {
1050                 if( DEBUGLVL( 0 ) ) {
1051                         dbgtext( "request_oplock_break: failed when sending a oplock " );
1052                         dbgtext( "break message to pid %d ", (int)share_entry->pid );
1053                         dbgtext( "on port %d ", share_entry->op_port );
1054                         dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1055                                 (unsigned int)dev, (double)inode, file_id );
1056                         dbgtext( "Error was %s\n", strerror(errno) );
1057                 }
1058                 return False;
1059         }
1060
1061         /*
1062          * Now we must await the oplock broken message coming back
1063          * from the target smbd process. Timeout if it fails to
1064          * return in (OPLOCK_BREAK_TIMEOUT + OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR) seconds.
1065          * While we get messages that aren't ours, loop.
1066          */
1067
1068         start_time = time(NULL);
1069         time_left = OPLOCK_BREAK_TIMEOUT+OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR;
1070
1071         while(time_left >= 0) {
1072                 char op_break_reply[OPBRK_CMD_HEADER_LEN+OPLOCK_BREAK_MSG_LEN];
1073                 uint16 reply_from_port;
1074                 char *reply_msg_start;
1075
1076                 if(receive_local_message(op_break_reply, sizeof(op_break_reply),
1077                                 time_left ? time_left * 1000 : 1) == False) {
1078                         if(smb_read_error == READ_TIMEOUT) {
1079                                 if( DEBUGLVL( 0 ) ) {
1080                                         dbgtext( "request_oplock_break: no response received to oplock " );
1081                                         dbgtext( "break request to pid %d ", (int)share_entry->pid );
1082                                         dbgtext( "on port %d ", share_entry->op_port );
1083                                         dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1084                                                         (unsigned int)dev, (double)inode, file_id );
1085                                 }
1086
1087                                 /*
1088                                  * This is a hack to make handling of failing clients more robust.
1089                                  * If a oplock break response message is not received in the timeout
1090                                  * period we may assume that the smbd servicing that client holding
1091                                  * the oplock has died and the client changes were lost anyway, so
1092                                  * we should continue to try and open the file.
1093                                  */
1094                                 break;
1095                         } else {
1096                                 if( DEBUGLVL( 0 ) ) {
1097                                         dbgtext( "request_oplock_break: error in response received " );
1098                                         dbgtext( "to oplock break request to pid %d ", (int)share_entry->pid );
1099                                         dbgtext( "on port %d ", share_entry->op_port );
1100                                         dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1101                                                 (unsigned int)dev, (double)inode, file_id );
1102                                         dbgtext( "Error was (%s).\n", strerror(errno) );
1103                                 }
1104                         }
1105                         return False;
1106                 }
1107
1108                 reply_from_port = SVAL(op_break_reply,OPBRK_CMD_PORT_OFFSET);
1109                 reply_msg_start = &op_break_reply[OPBRK_CMD_HEADER_LEN];
1110
1111                 /*
1112                  * Test to see if this is the reply we are awaiting (ie. the one we sent with the CMD_REPLY flag OR'ed in).
1113                  */
1114                 if((SVAL(reply_msg_start,OPBRK_MESSAGE_CMD_OFFSET) & CMD_REPLY) &&
1115                         ((SVAL(reply_msg_start,OPBRK_MESSAGE_CMD_OFFSET) & ~CMD_REPLY) == break_cmd_type) &&
1116                         (reply_from_port == share_entry->op_port) &&
1117                         (memcmp(&reply_msg_start[OPLOCK_BREAK_PID_OFFSET], &op_break_msg[OPLOCK_BREAK_PID_OFFSET],
1118                                 OPLOCK_BREAK_MSG_LEN - OPLOCK_BREAK_PID_OFFSET) == 0)) {
1119
1120                         /*
1121                          * This is the reply we've been waiting for.
1122                          */
1123                         break;
1124                 } else {
1125                         /*
1126                          * This is another message - a break request.
1127                          * Note that both kernel oplock break requests
1128                          * and UDP inter-smbd oplock break requests will
1129                          * be processed here.
1130                          *
1131                          * Process it to prevent potential deadlock.
1132                          * Note that the code in switch_message() prevents
1133                          * us from recursing into here as any SMB requests
1134                          * we might process that would cause another oplock
1135                          * break request to be made will be queued.
1136                          * JRA.
1137                          */
1138
1139                         process_local_message(op_break_reply, sizeof(op_break_reply));
1140                 }
1141
1142                 time_left -= (time(NULL) - start_time);
1143         }
1144
1145         DEBUG(3,("request_oplock_break: broke oplock.\n"));
1146
1147         return True;
1148 }
1149
1150 /****************************************************************************
1151   Attempt to break an oplock on a file (if oplocked).
1152   Returns True if the file was closed as a result of
1153   the oplock break, False otherwise.
1154   Used as a last ditch attempt to free a space in the
1155   file table when we have run out.
1156 ****************************************************************************/
1157
1158 BOOL attempt_close_oplocked_file(files_struct *fsp)
1159 {
1160         DEBUG(5,("attempt_close_oplocked_file: checking file %s.\n", fsp->fsp_name));
1161
1162         if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && !fsp->sent_oplock_break && (fsp->fh->fd != -1)) {
1163                 /* Try and break the oplock. */
1164                 if (oplock_break(fsp->dev, fsp->inode, fsp->file_id, True)) {
1165                         if(file_find_fsp(fsp) == NULL) /* Did the oplock break close the file ? */
1166                                 return True;
1167                 }
1168         }
1169
1170         return False;
1171 }
1172
1173 /****************************************************************************
1174  Send an asynchronous oplock break message to another smbd process.
1175 ****************************************************************************/
1176
1177 static BOOL request_remote_level2_async_oplock_break(share_mode_entry *share_entry)
1178 {
1179         char op_break_msg[OPLOCK_BREAK_MSG_LEN];
1180         struct sockaddr_in addr_out;
1181         pid_t pid = sys_getpid();
1182         SMB_DEV_T dev = share_entry->dev;
1183         SMB_INO_T inode = share_entry->inode;
1184         unsigned long file_id = share_entry->share_file_id;
1185
1186         /* We need to send a ASYNC_LEVEL_II_OPLOCK_BREAK_CMD message to the port in the share mode entry. */
1187
1188         SSVAL(op_break_msg,OPBRK_MESSAGE_CMD_OFFSET,ASYNC_LEVEL_II_OPLOCK_BREAK_CMD);
1189         memcpy(op_break_msg+OPLOCK_BREAK_PID_OFFSET,(char *)&pid,sizeof(pid));
1190         memcpy(op_break_msg+OPLOCK_BREAK_DEV_OFFSET,(char *)&dev,sizeof(dev));
1191         memcpy(op_break_msg+OPLOCK_BREAK_INODE_OFFSET,(char *)&inode,sizeof(inode));
1192         memcpy(op_break_msg+OPLOCK_BREAK_FILEID_OFFSET,(char *)&file_id,sizeof(file_id));
1193
1194         /* Set the address and port. */
1195         memset((char *)&addr_out,'\0',sizeof(addr_out));
1196         addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1197         addr_out.sin_port = htons( share_entry->op_port );
1198         addr_out.sin_family = AF_INET;
1199
1200         if( DEBUGLVL( 3 ) ) {
1201                 dbgtext( "request_remote_level2_async_oplock_break: sending an asynchronous oplock break message to ");
1202                 dbgtext( "pid %d on port %d ", (int)share_entry->pid, share_entry->op_port );
1203                 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1204             (unsigned int)dev, (double)inode, file_id );
1205         }
1206
1207         if(sys_sendto(oplock_sock,op_break_msg,OPLOCK_BREAK_MSG_LEN,0,
1208                         (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0) {
1209                 if( DEBUGLVL( 0 ) ) {
1210                         dbgtext( "request_remote_level2_async_oplock_break: failed when sending a oplock " );
1211                         dbgtext( "break message to pid %d ", (int)share_entry->pid );
1212                         dbgtext( "on port %d ", share_entry->op_port );
1213                         dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1214                                 (unsigned int)dev, (double)inode, file_id );
1215                         dbgtext( "Error was %s\n", strerror(errno) );
1216                 }
1217                 return False;
1218         }
1219
1220         DEBUG(3,("request_remote_level2_async_oplock_break: sent async break message to level II entry.\n"));
1221         return True;
1222 }
1223
1224 /****************************************************************************
1225  This function is called on any file modification or lock request. If a file
1226  is level 2 oplocked then it must tell all other level 2 holders to break to none.
1227 ****************************************************************************/
1228
1229 void release_level_2_oplocks_on_change(files_struct *fsp)
1230 {
1231         share_mode_entry *share_list = NULL;
1232         pid_t pid = sys_getpid();
1233         int num_share_modes = 0;
1234         int i;
1235         BOOL dummy;
1236
1237         /*
1238          * If this file is level II oplocked then we need
1239          * to grab the shared memory lock and inform all
1240          * other files with a level II lock that they need
1241          * to flush their read caches. We keep the lock over
1242          * the shared memory area whilst doing this.
1243          */
1244
1245         if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
1246                 return;
1247
1248         if (lock_share_entry_fsp(fsp) == False) {
1249                 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock share mode entry for file %s.\n", fsp->fsp_name ));
1250         }
1251
1252         num_share_modes = get_share_modes(fsp->dev, fsp->inode, &share_list,
1253                                           &dummy);
1254
1255         DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
1256                         num_share_modes ));
1257
1258         for(i = 0; i < num_share_modes; i++) {
1259                 share_mode_entry *share_entry = &share_list[i];
1260
1261                 /*
1262                  * As there could have been multiple writes waiting at the lock_share_entry
1263                  * gate we may not be the first to enter. Hence the state of the op_types
1264                  * in the share mode entries may be partly NO_OPLOCK and partly LEVEL_II
1265                  * oplock. It will do no harm to re-send break messages to those smbd's
1266                  * that are still waiting their turn to remove their LEVEL_II state, and
1267                  * also no harm to ignore existing NO_OPLOCK states. JRA.
1268                  */
1269
1270                 DEBUG(10,("release_level_2_oplocks_on_change: share_entry[%i]->op_type == %d\n",
1271                                 i, share_entry->op_type ));
1272
1273                 if (share_entry->op_type == NO_OPLOCK)
1274                         continue;
1275
1276                 /* Paranoia .... */
1277                 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
1278                         DEBUG(0,("release_level_2_oplocks_on_change: PANIC. share mode entry %d is an exlusive oplock !\n", i ));
1279                         unlock_share_entry(fsp->conn, fsp->dev, fsp->inode);
1280                         abort();
1281                 }
1282
1283                 /*
1284                  * Check if this is a file we have open (including the
1285                  * file we've been called to do write_file on. If so
1286                  * then break it directly without releasing the lock.
1287                  */
1288
1289                 if (pid == share_entry->pid) {
1290                         files_struct *new_fsp = file_find_dif(share_entry->dev, share_entry->inode, share_entry->share_file_id);
1291
1292                         /* Paranoia check... */
1293                         if(new_fsp == NULL) {
1294                                 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. share mode entry %d is not a local file !\n", i ));
1295                                 unlock_share_entry(fsp->conn, fsp->dev, fsp->inode);
1296                                 abort();
1297                         }
1298
1299                         DEBUG(10,("release_level_2_oplocks_on_change: breaking our own oplock.\n"));
1300
1301                         oplock_break_level2(new_fsp, True);
1302
1303                 } else {
1304
1305                         /*
1306                          * This is a remote file and so we send an asynchronous
1307                          * message.
1308                          */
1309
1310                         DEBUG(10,("release_level_2_oplocks_on_change: breaking remote oplock (async).\n"));
1311                         request_remote_level2_async_oplock_break(share_entry);
1312                 }
1313         }
1314
1315         SAFE_FREE(share_list);
1316         unlock_share_entry_fsp(fsp);
1317
1318         /* Paranoia check... */
1319         if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type)) {
1320                 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. File %s still has a level II oplock.\n", fsp->fsp_name));
1321                 smb_panic("release_level_2_oplocks_on_change");
1322         }
1323 }
1324
1325 /****************************************************************************
1326  Send a 'retry your open' message to a process with a deferred open entry.
1327 ****************************************************************************/
1328
1329 BOOL send_deferred_open_retry_message(deferred_open_entry *entry)
1330 {
1331         char de_msg[DEFERRED_OPEN_MSG_LEN];
1332         struct sockaddr_in addr_out;
1333         pid_t pid = sys_getpid();
1334
1335         memset(de_msg, '\0', DEFERRED_OPEN_MSG_LEN);
1336         SSVAL(de_msg,DEFERRED_OPEN_CMD_OFFSET,RETRY_DEFERRED_OPEN_CMD);
1337         memcpy(de_msg+DEFERRED_OPEN_PID_OFFSET,(char *)&pid,sizeof(pid));
1338         memcpy(de_msg+DEFERRED_OPEN_DEV_OFFSET,(char *)&entry->dev,sizeof(entry->dev));
1339         memcpy(de_msg+DEFERRED_OPEN_INODE_OFFSET,(char *)&entry->inode,sizeof(entry->inode));
1340         memcpy(de_msg+DEFERRED_OPEN_MID_OFFSET,(char *)&entry->mid,sizeof(entry->mid));
1341
1342         /* Set the address and port. */
1343         memset((char *)&addr_out,'\0',sizeof(addr_out));
1344         addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1345         addr_out.sin_port = htons( entry->port );
1346         addr_out.sin_family = AF_INET;
1347
1348         if( DEBUGLVL( 3 ) ) {
1349                 dbgtext( "send_deferred_open_retry_message: sending a message to ");
1350                 dbgtext( "pid %d on port %d ", (int)entry->pid, entry->port );
1351                 dbgtext( "for dev = %x, inode = %.0f, mid = %u\n",
1352                         (unsigned int)entry->dev, (double)entry->inode, (unsigned int)entry->mid );
1353         }
1354
1355         if(sys_sendto(oplock_sock,de_msg,DEFERRED_OPEN_MSG_LEN,0,
1356                         (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0) {
1357                 if( DEBUGLVL( 0 ) ) {
1358                         dbgtext( "send_deferred_open_retry_message: failed sending a message to ");
1359                         dbgtext( "pid %d on port %d ", (int)entry->pid, entry->port );
1360                         dbgtext( "for dev = %x, inode = %.0f, mid = %u\n",
1361                                 (unsigned int)entry->dev, (double)entry->inode, (unsigned int)entry->mid );
1362                         dbgtext( "Error was %s\n", strerror(errno) );
1363                 }
1364                 return False;
1365         }
1366         return True;
1367 }
1368
1369 /****************************************************************************
1370  Setup oplocks for this process.
1371 ****************************************************************************/
1372
1373 BOOL init_oplocks(void)
1374 {
1375         struct sockaddr_in sock_name;
1376         socklen_t len = sizeof(sock_name);
1377
1378         DEBUG(3,("open_oplock_ipc: opening loopback UDP socket.\n"));
1379
1380         /* Open a lookback UDP socket on a random port. */
1381         oplock_sock = open_socket_in(SOCK_DGRAM, 0, 0, htonl(INADDR_LOOPBACK),False);
1382         if (oplock_sock == -1) {
1383                 DEBUG(0,("open_oplock_ipc: Failed to get local UDP socket for \
1384 address %lx. Error was %s\n", (long)htonl(INADDR_LOOPBACK), strerror(errno)));
1385                 global_oplock_port = 0;
1386                 return(False);
1387         }
1388
1389         /* Find out the transient UDP port we have been allocated. */
1390         if(getsockname(oplock_sock, (struct sockaddr *)&sock_name, &len)<0) {
1391                 DEBUG(0,("open_oplock_ipc: Failed to get local UDP port. Error was %s\n",
1392                          strerror(errno)));
1393                 close(oplock_sock);
1394                 oplock_sock = -1;
1395                 global_oplock_port = 0;
1396                 return False;
1397         }
1398         global_oplock_port = ntohs(sock_name.sin_port);
1399
1400         if (lp_kernel_oplocks()) {
1401 #if HAVE_KERNEL_OPLOCKS_IRIX
1402                 koplocks = irix_init_kernel_oplocks();
1403 #elif HAVE_KERNEL_OPLOCKS_LINUX
1404                 koplocks = linux_init_kernel_oplocks();
1405 #endif
1406         }
1407
1408         DEBUG(3,("open_oplock ipc: pid = %d, global_oplock_port = %u\n",
1409                  (int)sys_getpid(), global_oplock_port));
1410
1411         return True;
1412 }