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    Copyright (C) Volker Lendecke 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #define DBGC_CLASS DBGC_LOCKING
  24 #include "includes.h"
  25
  26 /* Current number of oplocks we have outstanding. */
  27 static int32 exclusive_oplocks_open = 0;
  28 static int32 level_II_oplocks_open = 0;
  29 BOOL global_client_failed_oplock_break = False;
  30
  31 extern uint32 global_client_caps;
  32 extern int smb_read_error;
  33
  34 static struct kernel_oplocks *koplocks;
  35
  36 /****************************************************************************
  37  Get the number of current exclusive oplocks.
  38 ****************************************************************************/
  39
  40 int32 get_number_of_exclusive_open_oplocks(void)
  41 {
  42   return exclusive_oplocks_open;
  43 }
  44
  45 /****************************************************************************
  46  Return True if an oplock message is pending.
  47 ****************************************************************************/
  48
  49 BOOL oplock_message_waiting(fd_set *fds)
  50 {
  51         if (koplocks && koplocks->msg_waiting(fds)) {
  52                 return True;
  53         }
  54
  55         return False;
  56 }
  57
  58 /****************************************************************************
  59  Find out if there are any kernel oplock messages waiting and process them
  60  if so. pfds is the fd_set from the main select loop (which contains any
  61  kernel oplock fd if that's what the system uses (IRIX). If may be NULL if
  62  we're calling this in a shutting down state.
  63 ****************************************************************************/
  64
  65 void process_kernel_oplocks(fd_set *pfds)
  66 {
  67         /*
  68          * We need to check for kernel oplocks before going into the select
  69          * here, as the EINTR generated by the linux kernel oplock may have
  70          * already been eaten. JRA.
  71          */
  72
  73         if (!koplocks) {
  74                 return;
  75         }
  76
  77         while (koplocks->msg_waiting(pfds)) {
  78                 files_struct *fsp;
  79                 char msg[MSG_SMB_KERNEL_BREAK_SIZE];
  80
  81                 fsp = koplocks->receive_message(pfds);
  82
  83                 if (fsp == NULL) {
  84                         DEBUG(3, ("Kernel oplock message announced, but none "
  85                                   "received\n"));
  86                         return;
  87                 }
  88
  89                 /* Put the kernel break info into the message. */
  90                 SDEV_T_VAL(msg,0,fsp->dev);
  91                 SINO_T_VAL(msg,8,fsp->inode);
  92                 SIVAL(msg,16,fsp->fh->file_id);
  93
  94                 /* Don't need to be root here as we're only ever
  95                    sending to ourselves. */
  96
  97                 message_send_pid(pid_to_procid(sys_getpid()),
  98                                  MSG_SMB_KERNEL_BREAK,
  99                                  &msg, MSG_SMB_KERNEL_BREAK_SIZE, True);
 100         }
 101 }
 102
 103 /****************************************************************************
 104  Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
 105  disabled (just sets flags). Returns True if oplock set.
 106 ****************************************************************************/
 107
 108 BOOL set_file_oplock(files_struct *fsp, int oplock_type)
 109 {
 110         if (koplocks && !koplocks->set_oplock(fsp, oplock_type)) {
 111                 return False;
 112         }
 113
 114         fsp->oplock_type = oplock_type;
 115         fsp->sent_oplock_break = NO_BREAK_SENT;
 116         if (oplock_type == LEVEL_II_OPLOCK) {
 117                 level_II_oplocks_open++;
 118         } else {
 119                 exclusive_oplocks_open++;
 120         }
 121
 122         DEBUG(5,("set_file_oplock: granted oplock on file %s, 0x%x/%.0f/%lu, "
 123                     "tv_sec = %x, tv_usec = %x\n",
 124                  fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode,
 125                  fsp->fh->file_id, (int)fsp->open_time.tv_sec,
 126                  (int)fsp->open_time.tv_usec ));
 127
 128         return True;
 129 }
 130
 131 /****************************************************************************
 132  Attempt to release an oplock on a file. Decrements oplock count.
 133 ****************************************************************************/
 134
 135 void release_file_oplock(files_struct *fsp)
 136 {
 137         if ((fsp->oplock_type != NO_OPLOCK) &&
 138             (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
 139             koplocks) {
 140                 koplocks->release_oplock(fsp);
 141         }
 142
 143         if (fsp->oplock_type == LEVEL_II_OPLOCK) {
 144                 level_II_oplocks_open--;
 145         } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 146                 exclusive_oplocks_open--;
 147         }
 148
 149         SMB_ASSERT(exclusive_oplocks_open>=0);
 150         SMB_ASSERT(level_II_oplocks_open>=0);
 151
 152         fsp->oplock_type = NO_OPLOCK;
 153         fsp->sent_oplock_break = NO_BREAK_SENT;
 154
 155         flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
 156 }
 157
 158 /****************************************************************************
 159  Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
 160 ****************************************************************************/
 161
 162 static void downgrade_file_oplock(files_struct *fsp)
 163 {
 164         if (koplocks) {
 165                 koplocks->release_oplock(fsp);
 166         }
 167         fsp->oplock_type = LEVEL_II_OPLOCK;
 168         exclusive_oplocks_open--;
 169         level_II_oplocks_open++;
 170         fsp->sent_oplock_break = NO_BREAK_SENT;
 171 }
 172
 173 /****************************************************************************
 174  Remove a file oplock. Copes with level II and exclusive.
 175  Locks then unlocks the share mode lock. Client can decide to go directly
 176  to none even if a "break-to-level II" was sent.
 177 ****************************************************************************/
 178
 179 BOOL remove_oplock(files_struct *fsp)
 180 {
 181         SMB_DEV_T dev = fsp->dev;
 182         SMB_INO_T inode = fsp->inode;
 183         BOOL ret;
 184         struct share_mode_lock *lck;
 185
 186         /* Remove the oplock flag from the sharemode. */
 187         lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL, NULL);
 188         if (lck == NULL) {
 189                 DEBUG(0,("remove_oplock: failed to lock share entry for "
 190                          "file %s\n", fsp->fsp_name ));
 191                 return False;
 192         }
 193         ret = remove_share_oplock(lck, fsp);
 194         if (!ret) {
 195                 DEBUG(0,("remove_oplock: failed to remove share oplock for "
 196                          "file %s fnum %d, 0x%x/%.0f\n",
 197                          fsp->fsp_name, fsp->fnum, (unsigned int)dev,
 198                          (double)inode));
 199         }
 200         release_file_oplock(fsp);
 201         TALLOC_FREE(lck);
 202         return ret;
 203 }
 204
 205 /*
 206  * Deal with a reply when a break-to-level II was sent.
 207  */
 208 BOOL downgrade_oplock(files_struct *fsp)
 209 {
 210         SMB_DEV_T dev = fsp->dev;
 211         SMB_INO_T inode = fsp->inode;
 212         BOOL ret;
 213         struct share_mode_lock *lck;
 214
 215         lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL, NULL);
 216         if (lck == NULL) {
 217                 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
 218                          "file %s\n", fsp->fsp_name ));
 219                 return False;
 220         }
 221         ret = downgrade_share_oplock(lck, fsp);
 222         if (!ret) {
 223                 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
 224                          "for file %s fnum %d, dev = %x, inode = %.0f\n",
 225                          fsp->fsp_name, fsp->fnum, (unsigned int)dev,
 226                          (double)inode));
 227         }
 228
 229         downgrade_file_oplock(fsp);
 230         TALLOC_FREE(lck);
 231         return ret;
 232 }
 233
 234 /****************************************************************************
 235  Return the fd (if any) used for receiving oplock notifications.
 236 ****************************************************************************/
 237
 238 int oplock_notify_fd(void)
 239 {
 240         if (koplocks) {
 241                 return koplocks->notification_fd;
 242         }
 243
 244         return -1;
 245 }
 246
 247 /****************************************************************************
 248  Set up an oplock break message.
 249 ****************************************************************************/
 250
 251 static char *new_break_smb_message(TALLOC_CTX *mem_ctx,
 252                                    files_struct *fsp, uint8 cmd)
 253 {
 254         char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
 255
 256         if (result == NULL) {
 257                 DEBUG(0, ("talloc failed\n"));
 258                 return NULL;
 259         }
 260
 261         memset(result,'\0',smb_size);
 262         set_message(result,8,0,True);
 263         SCVAL(result,smb_com,SMBlockingX);
 264         SSVAL(result,smb_tid,fsp->conn->cnum);
 265         SSVAL(result,smb_pid,0xFFFF);
 266         SSVAL(result,smb_uid,0);
 267         SSVAL(result,smb_mid,0xFFFF);
 268         SCVAL(result,smb_vwv0,0xFF);
 269         SSVAL(result,smb_vwv2,fsp->fnum);
 270         SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
 271         SCVAL(result,smb_vwv3+1,cmd);
 272         return result;
 273 }
 274
 275 /****************************************************************************
 276  Function to do the waiting before sending a local break.
 277 ****************************************************************************/
 278
 279 static void wait_before_sending_break(void)
 280 {
 281         long wait_time = (long)lp_oplock_break_wait_time();
 282
 283         if (wait_time) {
 284                 smb_msleep(wait_time);
 285         }
 286 }
 287
 288 /****************************************************************************
 289  Ensure that we have a valid oplock.
 290 ****************************************************************************/
 291
 292 static files_struct *initial_break_processing(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
 293 {
 294         files_struct *fsp = NULL;
 295
 296         if( DEBUGLVL( 3 ) ) {
 297                 dbgtext( "initial_break_processing: called for 0x%x/%.0f/%u\n",
 298                         (unsigned int)dev, (double)inode, (int)file_id);
 299                 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
 300                         exclusive_oplocks_open, level_II_oplocks_open );
 301         }
 302
 303         /*
 304          * We need to search the file open table for the
 305          * entry containing this dev and inode, and ensure
 306          * we have an oplock on it.
 307          */
 308
 309         fsp = file_find_dif(dev, inode, file_id);
 310
 311         if(fsp == NULL) {
 312                 /* The file could have been closed in the meantime - return success. */
 313                 if( DEBUGLVL( 3 ) ) {
 314                         dbgtext( "initial_break_processing: cannot find open file with " );
 315                         dbgtext( "dev = 0x%x, inode = %.0f file_id = %lu", (unsigned int)dev,
 316                                 (double)inode, file_id);
 317                         dbgtext( "allowing break to succeed.\n" );
 318                 }
 319                 return NULL;
 320         }
 321
 322         /* Ensure we have an oplock on the file */
 323
 324         /*
 325          * There is a potential race condition in that an oplock could
 326          * have been broken due to another udp request, and yet there are
 327          * still oplock break messages being sent in the udp message
 328          * queue for this file. So return true if we don't have an oplock,
 329          * as we may have just freed it.
 330          */
 331
 332         if(fsp->oplock_type == NO_OPLOCK) {
 333                 if( DEBUGLVL( 3 ) ) {
 334                         dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
 335                         dbgtext( "(dev = %x, inode = %.0f, file_id = %lu) has no oplock.\n",
 336                                 (unsigned int)dev, (double)inode, fsp->fh->file_id );
 337                         dbgtext( "Allowing break to succeed regardless.\n" );
 338                 }
 339                 return NULL;
 340         }
 341
 342         return fsp;
 343 }
 344
 345 static void oplock_timeout_handler(struct timed_event *te,
 346                                    const struct timeval *now,
 347                                    void *private_data)
 348 {
 349         files_struct *fsp = (files_struct *)private_data;
 350
 351         /* Ensure we always remove this event. */
 352         if (fsp->oplock_timeout != NULL) {
 353                 /* Remove the timed event handler. */
 354                 TALLOC_FREE(fsp->oplock_timeout);
 355                 fsp->oplock_timeout = NULL;
 356         }
 357         DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp->fsp_name));
 358         global_client_failed_oplock_break = True;
 359         remove_oplock(fsp);
 360         reply_to_oplock_break_requests(fsp);
 361 }
 362
 363 /*******************************************************************
 364  Add a timeout handler waiting for the client reply.
 365 *******************************************************************/
 366
 367 static void add_oplock_timeout_handler(files_struct *fsp)
 368 {
 369         if (fsp->oplock_timeout != NULL) {
 370                 DEBUG(0, ("Logic problem -- have an oplock event hanging "
 371                           "around\n"));
 372         }
 373
 374         fsp->oplock_timeout =
 375                 add_timed_event(NULL,
 376                                 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
 377                                 "oplock_timeout_handler",
 378                                 oplock_timeout_handler, fsp);
 379
 380         if (fsp->oplock_timeout == NULL) {
 381                 DEBUG(0, ("Could not add oplock timeout handler\n"));
 382         }
 383 }
 384
 385 /*******************************************************************
 386  This handles the case of a write triggering a break to none
 387  message on a level2 oplock.
 388  When we get this message we may be in any of three states :
 389  NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
 390  the client for LEVEL2.
 391 *******************************************************************/
 392
 393 static void process_oplock_async_level2_break_message(int msg_type, struct process_id src,
 394                                          void *buf, size_t len)
 395 {
 396         struct share_mode_entry msg;
 397         files_struct *fsp;
 398         char *break_msg;
 399         BOOL sign_state;
 400
 401         if (buf == NULL) {
 402                 DEBUG(0, ("Got NULL buffer\n"));
 403                 return;
 404         }
 405
 406         if (len != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 407                 DEBUG(0, ("Got invalid msg len %d\n", (int)len));
 408                 return;
 409         }
 410
 411         /* De-linearize incoming message. */
 412         message_to_share_mode_entry(&msg, (char *)buf);
 413
 414         DEBUG(10, ("Got oplock async level 2 break message from pid %d: 0x%x/%.0f/%lu\n",
 415                    (int)procid_to_pid(&src), (unsigned int)msg.dev,
 416                    (double)msg.inode, msg.share_file_id));
 417
 418         fsp = initial_break_processing(msg.dev, msg.inode,
 419                                        msg.share_file_id);
 420
 421         if (fsp == NULL) {
 422                 /* We hit a race here. Break messages are sent, and before we
 423                  * get to process this message, we have closed the file.
 424                  * No need to reply as this is an async message. */
 425                 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
 426                 return;
 427         }
 428
 429         if (fsp->oplock_type == NO_OPLOCK) {
 430                 /* We already got a "break to none" message and we've handled it.
 431                  * just ignore. */
 432                 DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
 433                 return;
 434         }
 435
 436         if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
 437                 /* Don't tell the client, just downgrade. */
 438                 DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
 439                 remove_oplock(fsp);
 440                 return;
 441         }
 442
 443         /* Ensure we're really at level2 state. */
 444         SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
 445
 446         /* Now send a break to none message to our client. */
 447
 448         break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
 449         if (break_msg == NULL) {
 450                 exit_server("Could not talloc break_msg\n");
 451         }
 452
 453         /* Need to wait before sending a break message if we sent ourselves this message. */
 454         if (procid_to_pid(&src) == sys_getpid()) {
 455                 wait_before_sending_break();
 456         }
 457
 458         /* Save the server smb signing state. */
 459         sign_state = srv_oplock_set_signing(False);
 460
 461         show_msg(break_msg);
 462         if (!send_smb(smbd_server_fd(), break_msg)) {
 463                 exit_server("oplock_break: send_smb failed.");
 464         }
 465
 466         /* Restore the sign state to what it was. */
 467         srv_oplock_set_signing(sign_state);
 468
 469         TALLOC_FREE(break_msg);
 470
 471         /* Async level2 request, don't send a reply, just remove the oplock. */
 472         remove_oplock(fsp);
 473 }
 474
 475 /*******************************************************************
 476  This handles the generic oplock break message from another smbd.
 477 *******************************************************************/
 478
 479 static void process_oplock_break_message(int msg_type, struct process_id src,
 480                                          void *buf, size_t len)
 481 {
 482         struct share_mode_entry msg;
 483         files_struct *fsp;
 484         char *break_msg;
 485         BOOL break_to_level2 = False;
 486         BOOL sign_state;
 487
 488         if (buf == NULL) {
 489                 DEBUG(0, ("Got NULL buffer\n"));
 490                 return;
 491         }
 492
 493         if (len != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 494                 DEBUG(0, ("Got invalid msg len %d\n", (int)len));
 495                 return;
 496         }
 497
 498         /* De-linearize incoming message. */
 499         message_to_share_mode_entry(&msg, (char *)buf);
 500
 501         DEBUG(10, ("Got oplock break message from pid %d: 0x%x/%.0f/%lu\n",
 502                    (int)procid_to_pid(&src), (unsigned int)msg.dev,
 503                    (double)msg.inode, msg.share_file_id));
 504
 505         fsp = initial_break_processing(msg.dev, msg.inode,
 506                                        msg.share_file_id);
 507
 508         if (fsp == NULL) {
 509                 /* a We hit race here. Break messages are sent, and before we
 510                  * get to process this message, we have closed the file. Reply
 511                  * with 'ok, oplock broken' */
 512                 DEBUG(3, ("Did not find fsp\n"));
 513
 514                 /* We just send the same message back. */
 515                 message_send_pid(src, MSG_SMB_BREAK_RESPONSE,
 516                                  buf, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
 517                 return;
 518         }
 519
 520         if (fsp->sent_oplock_break != NO_BREAK_SENT) {
 521                 /* Remember we have to inform the requesting PID when the
 522                  * client replies */
 523                 msg.pid = src;
 524                 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
 525                              &fsp->pending_break_messages,
 526                              &fsp->num_pending_break_messages);
 527                 return;
 528         }
 529
 530         if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
 531             !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 532                 DEBUG(3, ("Already downgraded oplock on 0x%x/%.0f: %s\n",
 533                           (unsigned int)fsp->dev, (double)fsp->inode,
 534                           fsp->fsp_name));
 535                 /* We just send the same message back. */
 536                 message_send_pid(src, MSG_SMB_BREAK_RESPONSE,
 537                                  buf, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
 538                 return;
 539         }
 540
 541         if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
 542             !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
 543             !koplocks && /* NOTE: we force levelII off for kernel oplocks -
 544                           * this will change when it is supported */
 545             lp_level2_oplocks(SNUM(fsp->conn))) {
 546                 break_to_level2 = True;
 547         }
 548
 549         break_msg = new_break_smb_message(NULL, fsp, break_to_level2 ?
 550                                           OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
 551         if (break_msg == NULL) {
 552                 exit_server("Could not talloc break_msg\n");
 553         }
 554
 555         /* Need to wait before sending a break message if we sent ourselves this message. */
 556         if (procid_to_pid(&src) == sys_getpid()) {
 557                 wait_before_sending_break();
 558         }
 559
 560         /* Save the server smb signing state. */
 561         sign_state = srv_oplock_set_signing(False);
 562
 563         show_msg(break_msg);
 564         if (!send_smb(smbd_server_fd(), break_msg)) {
 565                 exit_server("oplock_break: send_smb failed.");
 566         }
 567
 568         /* Restore the sign state to what it was. */
 569         srv_oplock_set_signing(sign_state);
 570
 571         TALLOC_FREE(break_msg);
 572
 573         fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
 574
 575         msg.pid = src;
 576         ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
 577                      &fsp->pending_break_messages,
 578                      &fsp->num_pending_break_messages);
 579
 580         add_oplock_timeout_handler(fsp);
 581 }
 582
 583 /*******************************************************************
 584  This handles the kernel oplock break message.
 585 *******************************************************************/
 586
 587 static void process_kernel_oplock_break(int msg_type, struct process_id src,
 588                                         void *buf, size_t len)
 589 {
 590         SMB_DEV_T dev;
 591         SMB_INO_T inode;
 592         unsigned long file_id;
 593         files_struct *fsp;
 594         char *break_msg;
 595         BOOL sign_state;
 596
 597         if (buf == NULL) {
 598                 DEBUG(0, ("Got NULL buffer\n"));
 599                 return;
 600         }
 601
 602         if (len != MSG_SMB_KERNEL_BREAK_SIZE) {
 603                 DEBUG(0, ("Got invalid msg len %d\n", (int)len));
 604                 return;
 605         }
 606
 607         /* Pull the data from the message. */
 608         dev = DEV_T_VAL(buf, 0);
 609         inode = INO_T_VAL(buf, 8);
 610         file_id = (unsigned long)IVAL(buf, 16);
 611
 612         DEBUG(10, ("Got kernel oplock break message from pid %d: 0x%x/%.0f/%u\n",
 613                    (int)procid_to_pid(&src), (unsigned int)dev, (double)inode,
 614                    (unsigned int)file_id));
 615
 616         fsp = initial_break_processing(dev, inode, file_id);
 617
 618         if (fsp == NULL) {
 619                 DEBUG(3, ("Got a kernel oplock break message for a file "
 620                           "I don't know about\n"));
 621                 return;
 622         }
 623
 624         if (fsp->sent_oplock_break != NO_BREAK_SENT) {
 625                 /* This is ok, kernel oplocks come in completely async */
 626                 DEBUG(3, ("Got a kernel oplock request while waiting for a "
 627                           "break reply\n"));
 628                 return;
 629         }
 630
 631         break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
 632         if (break_msg == NULL) {
 633                 exit_server("Could not talloc break_msg\n");
 634         }
 635
 636         /* Save the server smb signing state. */
 637         sign_state = srv_oplock_set_signing(False);
 638
 639         show_msg(break_msg);
 640         if (!send_smb(smbd_server_fd(), break_msg)) {
 641                 exit_server("oplock_break: send_smb failed.");
 642         }
 643
 644         /* Restore the sign state to what it was. */
 645         srv_oplock_set_signing(sign_state);
 646
 647         TALLOC_FREE(break_msg);
 648
 649         fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
 650
 651         add_oplock_timeout_handler(fsp);
 652 }
 653
 654 void reply_to_oplock_break_requests(files_struct *fsp)
 655 {
 656         int i;
 657
 658         for (i=0; i<fsp->num_pending_break_messages; i++) {
 659                 struct share_mode_entry *e = &fsp->pending_break_messages[i];
 660                 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
 661
 662                 share_mode_entry_to_message(msg, e);
 663
 664                 message_send_pid(e->pid, MSG_SMB_BREAK_RESPONSE,
 665                                  msg, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
 666         }
 667
 668         SAFE_FREE(fsp->pending_break_messages);
 669         fsp->num_pending_break_messages = 0;
 670         if (fsp->oplock_timeout != NULL) {
 671                 /* Remove the timed event handler. */
 672                 TALLOC_FREE(fsp->oplock_timeout);
 673                 fsp->oplock_timeout = NULL;
 674         }
 675         return;
 676 }
 677
 678 static void process_oplock_break_response(int msg_type, struct process_id src,
 679                                           void *buf, size_t len)
 680 {
 681         struct share_mode_entry msg;
 682
 683         if (buf == NULL) {
 684                 DEBUG(0, ("Got NULL buffer\n"));
 685                 return;
 686         }
 687
 688         if (len != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 689                 DEBUG(0, ("Got invalid msg len %u\n", (unsigned int)len));
 690                 return;
 691         }
 692
 693         /* De-linearize incoming message. */
 694         message_to_share_mode_entry(&msg, (char *)buf);
 695
 696         DEBUG(10, ("Got oplock break response from pid %d: 0x%x/%.0f/%lu mid %u\n",
 697                    (int)procid_to_pid(&src), (unsigned int)msg.dev,
 698                    (double)msg.inode, msg.share_file_id,
 699                    (unsigned int)msg.op_mid));
 700
 701         /* Here's the hack from open.c, store the mid in the 'port' field */
 702         schedule_deferred_open_smb_message(msg.op_mid);
 703 }
 704
 705 static void process_open_retry_message(int msg_type, struct process_id src,
 706                                        void *buf, size_t len)
 707 {
 708         struct share_mode_entry msg;
 709
 710         if (buf == NULL) {
 711                 DEBUG(0, ("Got NULL buffer\n"));
 712                 return;
 713         }
 714
 715         if (len != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 716                 DEBUG(0, ("Got invalid msg len %d\n", (int)len));
 717                 return;
 718         }
 719
 720         /* De-linearize incoming message. */
 721         message_to_share_mode_entry(&msg, (char *)buf);
 722
 723         DEBUG(10, ("Got open retry msg from pid %d: 0x%x/%.0f/%lu mid %u\n",
 724                    (int)procid_to_pid(&src), (unsigned int)msg.dev,
 725                    (double)msg.inode, msg.share_file_id,
 726                    (unsigned int)msg.op_mid));
 727
 728         schedule_deferred_open_smb_message(msg.op_mid);
 729 }
 730
 731 /****************************************************************************
 732  This function is called on any file modification or lock request. If a file
 733  is level 2 oplocked then it must tell all other level 2 holders to break to
 734  none.
 735 ****************************************************************************/
 736
 737 void release_level_2_oplocks_on_change(files_struct *fsp)
 738 {
 739         int i;
 740         struct share_mode_lock *lck;
 741
 742         /*
 743          * If this file is level II oplocked then we need
 744          * to grab the shared memory lock and inform all
 745          * other files with a level II lock that they need
 746          * to flush their read caches. We keep the lock over
 747          * the shared memory area whilst doing this.
 748          */
 749
 750         if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
 751                 return;
 752
 753         lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL, NULL);
 754         if (lck == NULL) {
 755                 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
 756                          "share mode entry for file %s.\n", fsp->fsp_name ));
 757                 return;
 758         }
 759
 760         DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
 761                   lck->num_share_modes ));
 762
 763         for(i = 0; i < lck->num_share_modes; i++) {
 764                 struct share_mode_entry *share_entry = &lck->share_modes[i];
 765                 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
 766
 767                 if (!is_valid_share_mode_entry(share_entry)) {
 768                         continue;
 769                 }
 770
 771                 /*
 772                  * As there could have been multiple writes waiting at the
 773                  * lock_share_entry gate we may not be the first to
 774                  * enter. Hence the state of the op_types in the share mode
 775                  * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
 776                  * oplock. It will do no harm to re-send break messages to
 777                  * those smbd's that are still waiting their turn to remove
 778                  * their LEVEL_II state, and also no harm to ignore existing
 779                  * NO_OPLOCK states. JRA.
 780                  */
 781
 782                 DEBUG(10,("release_level_2_oplocks_on_change: "
 783                           "share_entry[%i]->op_type == %d\n",
 784                           i, share_entry->op_type ));
 785
 786                 if (share_entry->op_type == NO_OPLOCK) {
 787                         continue;
 788                 }
 789
 790                 /* Paranoia .... */
 791                 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
 792                         DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
 793                                  "share mode entry %d is an exlusive "
 794                                  "oplock !\n", i ));
 795                         TALLOC_FREE(lck);
 796                         abort();
 797                 }
 798
 799                 share_mode_entry_to_message(msg, share_entry);
 800
 801                 message_send_pid(share_entry->pid, MSG_SMB_ASYNC_LEVEL2_BREAK,
 802                                  msg, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
 803         }
 804
 805         /* We let the message receivers handle removing the oplock state
 806            in the share mode lock db. */
 807
 808         TALLOC_FREE(lck);
 809 }
 810
 811 /****************************************************************************
 812  Linearize a share mode entry struct to an internal oplock break message.
 813 ****************************************************************************/
 814
 815 void share_mode_entry_to_message(char *msg, struct share_mode_entry *e)
 816 {
 817         SIVAL(msg,0,(uint32)e->pid.pid);
 818         SSVAL(msg,4,e->op_mid);
 819         SSVAL(msg,6,e->op_type);
 820         SIVAL(msg,8,e->access_mask);
 821         SIVAL(msg,12,e->share_access);
 822         SIVAL(msg,16,e->private_options);
 823         SIVAL(msg,20,(uint32)e->time.tv_sec);
 824         SIVAL(msg,24,(uint32)e->time.tv_usec);
 825         SDEV_T_VAL(msg,28,e->dev);
 826         SINO_T_VAL(msg,36,e->inode);
 827         SIVAL(msg,44,e->share_file_id);
 828         SIVAL(msg,48,e->uid);
 829 }
 830
 831 /****************************************************************************
 832  De-linearize an internal oplock break message to a share mode entry struct.
 833 ****************************************************************************/
 834
 835 void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
 836 {
 837         e->pid.pid = (pid_t)IVAL(msg,0);
 838         e->op_mid = SVAL(msg,4);
 839         e->op_type = SVAL(msg,6);
 840         e->access_mask = IVAL(msg,8);
 841         e->share_access = IVAL(msg,12);
 842         e->private_options = IVAL(msg,16);
 843         e->time.tv_sec = (time_t)IVAL(msg,20);
 844         e->time.tv_usec = (int)IVAL(msg,24);
 845         e->dev = DEV_T_VAL(msg,28);
 846         e->inode = INO_T_VAL(msg,36);
 847         e->share_file_id = (unsigned long)IVAL(msg,44);
 848         e->uid = (uint32)IVAL(msg,48);
 849 }
 850
 851 /****************************************************************************
 852  Setup oplocks for this process.
 853 ****************************************************************************/
 854
 855 BOOL init_oplocks(void)
 856 {
 857         DEBUG(3,("init_oplocks: initializing messages.\n"));
 858
 859         message_register(MSG_SMB_BREAK_REQUEST,
 860                          process_oplock_break_message);
 861         message_register(MSG_SMB_ASYNC_LEVEL2_BREAK,
 862                          process_oplock_async_level2_break_message);
 863         message_register(MSG_SMB_BREAK_RESPONSE,
 864                          process_oplock_break_response);
 865         message_register(MSG_SMB_KERNEL_BREAK,
 866                          process_kernel_oplock_break);
 867         message_register(MSG_SMB_OPEN_RETRY,
 868                          process_open_retry_message);
 869
 870         if (lp_kernel_oplocks()) {
 871 #if HAVE_KERNEL_OPLOCKS_IRIX
 872                 koplocks = irix_init_kernel_oplocks();
 873 #elif HAVE_KERNEL_OPLOCKS_LINUX
 874                 koplocks = linux_init_kernel_oplocks();
 875 #endif
 876         }
 877
 878         return True;
 879 }