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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #define DBGC_CLASS DBGC_LOCKING
  23 #include "includes.h"
  24
  25 /* Current number of oplocks we have outstanding. */
  26 static int32 exclusive_oplocks_open = 0;
  27 static int32 level_II_oplocks_open = 0;
  28 bool global_client_failed_oplock_break = False;
  29
  30 extern uint32 global_client_caps;
  31
  32 static struct kernel_oplocks *koplocks;
  33
  34 /****************************************************************************
  35  Get the number of current exclusive oplocks.
  36 ****************************************************************************/
  37
  38 int32 get_number_of_exclusive_open_oplocks(void)
  39 {
  40   return exclusive_oplocks_open;
  41 }
  42
  43 /****************************************************************************
  44  Return True if an oplock message is pending.
  45 ****************************************************************************/
  46
  47 bool oplock_message_waiting(fd_set *fds)
  48 {
  49         if (koplocks && koplocks->msg_waiting(fds)) {
  50                 return True;
  51         }
  52
  53         return False;
  54 }
  55
  56 /****************************************************************************
  57  Find out if there are any kernel oplock messages waiting and process them
  58  if so. pfds is the fd_set from the main select loop (which contains any
  59  kernel oplock fd if that's what the system uses (IRIX). If may be NULL if
  60  we're calling this in a shutting down state.
  61 ****************************************************************************/
  62
  63 void process_kernel_oplocks(struct messaging_context *msg_ctx, fd_set *pfds)
  64 {
  65         /*
  66          * We need to check for kernel oplocks before going into the select
  67          * here, as the EINTR generated by the linux kernel oplock may have
  68          * already been eaten. JRA.
  69          */
  70
  71         if (!koplocks) {
  72                 return;
  73         }
  74
  75         while (koplocks->msg_waiting(pfds)) {
  76                 files_struct *fsp;
  77                 char msg[MSG_SMB_KERNEL_BREAK_SIZE];
  78
  79                 fsp = koplocks->receive_message(pfds);
  80
  81                 if (fsp == NULL) {
  82                         DEBUG(3, ("Kernel oplock message announced, but none "
  83                                   "received\n"));
  84                         return;
  85                 }
  86
  87                 /* Put the kernel break info into the message. */
  88                 push_file_id_16(msg, &fsp->file_id);
  89                 SIVAL(msg,16,fsp->fh->gen_id);
  90
  91                 /* Don't need to be root here as we're only ever
  92                    sending to ourselves. */
  93
  94                 messaging_send_buf(msg_ctx, procid_self(),
  95                                    MSG_SMB_KERNEL_BREAK,
  96                                    (uint8 *)&msg, MSG_SMB_KERNEL_BREAK_SIZE);
  97         }
  98 }
  99
 100 /****************************************************************************
 101  Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
 102  disabled (just sets flags). Returns True if oplock set.
 103 ****************************************************************************/
 104
 105 bool set_file_oplock(files_struct *fsp, int oplock_type)
 106 {
 107         if (koplocks && !koplocks->set_oplock(fsp, oplock_type)) {
 108                 return False;
 109         }
 110
 111         fsp->oplock_type = oplock_type;
 112         fsp->sent_oplock_break = NO_BREAK_SENT;
 113         if (oplock_type == LEVEL_II_OPLOCK) {
 114                 level_II_oplocks_open++;
 115         } else {
 116                 exclusive_oplocks_open++;
 117         }
 118
 119         DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
 120                     "tv_sec = %x, tv_usec = %x\n",
 121                  fsp->fsp_name, file_id_string_tos(&fsp->file_id),
 122                  fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
 123                  (int)fsp->open_time.tv_usec ));
 124
 125         return True;
 126 }
 127
 128 /****************************************************************************
 129  Attempt to release an oplock on a file. Decrements oplock count.
 130 ****************************************************************************/
 131
 132 void release_file_oplock(files_struct *fsp)
 133 {
 134         if ((fsp->oplock_type != NO_OPLOCK) &&
 135             (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
 136             koplocks) {
 137                 koplocks->release_oplock(fsp);
 138         }
 139
 140         if (fsp->oplock_type == LEVEL_II_OPLOCK) {
 141                 level_II_oplocks_open--;
 142         } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 143                 exclusive_oplocks_open--;
 144         }
 145
 146         SMB_ASSERT(exclusive_oplocks_open>=0);
 147         SMB_ASSERT(level_II_oplocks_open>=0);
 148
 149         fsp->oplock_type = NO_OPLOCK;
 150         fsp->sent_oplock_break = NO_BREAK_SENT;
 151
 152         flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
 153
 154         TALLOC_FREE(fsp->oplock_timeout);
 155 }
 156
 157 /****************************************************************************
 158  Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
 159 ****************************************************************************/
 160
 161 static void downgrade_file_oplock(files_struct *fsp)
 162 {
 163         if (koplocks) {
 164                 koplocks->release_oplock(fsp);
 165         }
 166         fsp->oplock_type = LEVEL_II_OPLOCK;
 167         exclusive_oplocks_open--;
 168         level_II_oplocks_open++;
 169         fsp->sent_oplock_break = NO_BREAK_SENT;
 170 }
 171
 172 /****************************************************************************
 173  Remove a file oplock. Copes with level II and exclusive.
 174  Locks then unlocks the share mode lock. Client can decide to go directly
 175  to none even if a "break-to-level II" was sent.
 176 ****************************************************************************/
 177
 178 bool remove_oplock(files_struct *fsp)
 179 {
 180         bool ret;
 181         struct share_mode_lock *lck;
 182
 183         /* Remove the oplock flag from the sharemode. */
 184         lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
 185                                   NULL);
 186         if (lck == NULL) {
 187                 DEBUG(0,("remove_oplock: failed to lock share entry for "
 188                          "file %s\n", fsp->fsp_name ));
 189                 return False;
 190         }
 191         ret = remove_share_oplock(lck, fsp);
 192         if (!ret) {
 193                 DEBUG(0,("remove_oplock: failed to remove share oplock for "
 194                          "file %s fnum %d, %s\n",
 195                          fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
 196         }
 197         release_file_oplock(fsp);
 198         TALLOC_FREE(lck);
 199         return ret;
 200 }
 201
 202 /*
 203  * Deal with a reply when a break-to-level II was sent.
 204  */
 205 bool downgrade_oplock(files_struct *fsp)
 206 {
 207         bool ret;
 208         struct share_mode_lock *lck;
 209
 210         lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
 211                                   NULL);
 212         if (lck == NULL) {
 213                 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
 214                          "file %s\n", fsp->fsp_name ));
 215                 return False;
 216         }
 217         ret = downgrade_share_oplock(lck, fsp);
 218         if (!ret) {
 219                 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
 220                          "for file %s fnum %d, file_id %s\n",
 221                          fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
 222         }
 223
 224         downgrade_file_oplock(fsp);
 225         TALLOC_FREE(lck);
 226         return ret;
 227 }
 228
 229 /****************************************************************************
 230  Return the fd (if any) used for receiving oplock notifications.
 231 ****************************************************************************/
 232
 233 int oplock_notify_fd(void)
 234 {
 235         if (koplocks) {
 236                 return koplocks->notification_fd;
 237         }
 238
 239         return -1;
 240 }
 241
 242 /****************************************************************************
 243  Set up an oplock break message.
 244 ****************************************************************************/
 245
 246 static char *new_break_smb_message(TALLOC_CTX *mem_ctx,
 247                                    files_struct *fsp, uint8 cmd)
 248 {
 249         char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
 250
 251         if (result == NULL) {
 252                 DEBUG(0, ("talloc failed\n"));
 253                 return NULL;
 254         }
 255
 256         memset(result,'\0',smb_size);
 257         srv_set_message(result,8,0,true);
 258         SCVAL(result,smb_com,SMBlockingX);
 259         SSVAL(result,smb_tid,fsp->conn->cnum);
 260         SSVAL(result,smb_pid,0xFFFF);
 261         SSVAL(result,smb_uid,0);
 262         SSVAL(result,smb_mid,0xFFFF);
 263         SCVAL(result,smb_vwv0,0xFF);
 264         SSVAL(result,smb_vwv2,fsp->fnum);
 265         SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
 266         SCVAL(result,smb_vwv3+1,cmd);
 267         return result;
 268 }
 269
 270 /****************************************************************************
 271  Function to do the waiting before sending a local break.
 272 ****************************************************************************/
 273
 274 static void wait_before_sending_break(void)
 275 {
 276         long wait_time = (long)lp_oplock_break_wait_time();
 277
 278         if (wait_time) {
 279                 smb_msleep(wait_time);
 280         }
 281 }
 282
 283 /****************************************************************************
 284  Ensure that we have a valid oplock.
 285 ****************************************************************************/
 286
 287 static files_struct *initial_break_processing(struct file_id id, unsigned long file_id)
 288 {
 289         files_struct *fsp = NULL;
 290
 291         if( DEBUGLVL( 3 ) ) {
 292                 dbgtext( "initial_break_processing: called for %s/%u\n",
 293                          file_id_string_tos(&id), (int)file_id);
 294                 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
 295                         exclusive_oplocks_open, level_II_oplocks_open );
 296         }
 297
 298         /*
 299          * We need to search the file open table for the
 300          * entry containing this dev and inode, and ensure
 301          * we have an oplock on it.
 302          */
 303
 304         fsp = file_find_dif(id, file_id);
 305
 306         if(fsp == NULL) {
 307                 /* The file could have been closed in the meantime - return success. */
 308                 if( DEBUGLVL( 3 ) ) {
 309                         dbgtext( "initial_break_processing: cannot find open file with " );
 310                         dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
 311                         dbgtext( "allowing break to succeed.\n" );
 312                 }
 313                 return NULL;
 314         }
 315
 316         /* Ensure we have an oplock on the file */
 317
 318         /*
 319          * There is a potential race condition in that an oplock could
 320          * have been broken due to another udp request, and yet there are
 321          * still oplock break messages being sent in the udp message
 322          * queue for this file. So return true if we don't have an oplock,
 323          * as we may have just freed it.
 324          */
 325
 326         if(fsp->oplock_type == NO_OPLOCK) {
 327                 if( DEBUGLVL( 3 ) ) {
 328                         dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
 329                         dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
 330                                  file_id_string_tos(&id), fsp->fh->gen_id );
 331                         dbgtext( "Allowing break to succeed regardless.\n" );
 332                 }
 333                 return NULL;
 334         }
 335
 336         return fsp;
 337 }
 338
 339 static void oplock_timeout_handler(struct event_context *ctx,
 340                                    struct timed_event *te,
 341                                    const struct timeval *now,
 342                                    void *private_data)
 343 {
 344         files_struct *fsp = (files_struct *)private_data;
 345
 346         /* Remove the timed event handler. */
 347         TALLOC_FREE(fsp->oplock_timeout);
 348         DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp->fsp_name));
 349         global_client_failed_oplock_break = True;
 350         remove_oplock(fsp);
 351         reply_to_oplock_break_requests(fsp);
 352 }
 353
 354 /*******************************************************************
 355  Add a timeout handler waiting for the client reply.
 356 *******************************************************************/
 357
 358 static void add_oplock_timeout_handler(files_struct *fsp)
 359 {
 360         if (fsp->oplock_timeout != NULL) {
 361                 DEBUG(0, ("Logic problem -- have an oplock event hanging "
 362                           "around\n"));
 363         }
 364
 365         fsp->oplock_timeout =
 366                 event_add_timed(smbd_event_context(), NULL,
 367                                 timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
 368                                 "oplock_timeout_handler",
 369                                 oplock_timeout_handler, fsp);
 370
 371         if (fsp->oplock_timeout == NULL) {
 372                 DEBUG(0, ("Could not add oplock timeout handler\n"));
 373         }
 374 }
 375
 376 /*******************************************************************
 377  This handles the case of a write triggering a break to none
 378  message on a level2 oplock.
 379  When we get this message we may be in any of three states :
 380  NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
 381  the client for LEVEL2.
 382 *******************************************************************/
 383
 384 static void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
 385                                                       void *private_data,
 386                                                       uint32_t msg_type,
 387                                                       struct server_id src,
 388                                                       DATA_BLOB *data)
 389 {
 390         struct share_mode_entry msg;
 391         files_struct *fsp;
 392         char *break_msg;
 393         bool sign_state;
 394
 395         if (data->data == NULL) {
 396                 DEBUG(0, ("Got NULL buffer\n"));
 397                 return;
 398         }
 399
 400         if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 401                 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
 402                 return;
 403         }
 404
 405         /* De-linearize incoming message. */
 406         message_to_share_mode_entry(&msg, (char *)data->data);
 407
 408         DEBUG(10, ("Got oplock async level 2 break message from pid %d: %s/%lu\n",
 409                    (int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id));
 410
 411         fsp = initial_break_processing(msg.id, msg.share_file_id);
 412
 413         if (fsp == NULL) {
 414                 /* We hit a race here. Break messages are sent, and before we
 415                  * get to process this message, we have closed the file.
 416                  * No need to reply as this is an async message. */
 417                 DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
 418                 return;
 419         }
 420
 421         if (fsp->oplock_type == NO_OPLOCK) {
 422                 /* We already got a "break to none" message and we've handled it.
 423                  * just ignore. */
 424                 DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
 425                 return;
 426         }
 427
 428         if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
 429                 /* Don't tell the client, just downgrade. */
 430                 DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
 431                 remove_oplock(fsp);
 432                 return;
 433         }
 434
 435         /* Ensure we're really at level2 state. */
 436         SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
 437
 438         /* Now send a break to none message to our client. */
 439
 440         break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
 441         if (break_msg == NULL) {
 442                 exit_server("Could not talloc break_msg\n");
 443         }
 444
 445         /* Need to wait before sending a break message if we sent ourselves this message. */
 446         if (procid_to_pid(&src) == sys_getpid()) {
 447                 wait_before_sending_break();
 448         }
 449
 450         /* Save the server smb signing state. */
 451         sign_state = srv_oplock_set_signing(False);
 452
 453         show_msg(break_msg);
 454         if (!srv_send_smb(smbd_server_fd(),
 455                         break_msg,
 456                         IS_CONN_ENCRYPTED(fsp->conn))) {
 457                 exit_server_cleanly("oplock_break: srv_send_smb failed.");
 458         }
 459
 460         /* Restore the sign state to what it was. */
 461         srv_oplock_set_signing(sign_state);
 462
 463         TALLOC_FREE(break_msg);
 464
 465         /* Async level2 request, don't send a reply, just remove the oplock. */
 466         remove_oplock(fsp);
 467 }
 468
 469 /*******************************************************************
 470  This handles the generic oplock break message from another smbd.
 471 *******************************************************************/
 472
 473 static void process_oplock_break_message(struct messaging_context *msg_ctx,
 474                                          void *private_data,
 475                                          uint32_t msg_type,
 476                                          struct server_id src,
 477                                          DATA_BLOB *data)
 478 {
 479         struct share_mode_entry msg;
 480         files_struct *fsp;
 481         char *break_msg;
 482         bool break_to_level2 = False;
 483         bool sign_state;
 484
 485         if (data->data == NULL) {
 486                 DEBUG(0, ("Got NULL buffer\n"));
 487                 return;
 488         }
 489
 490         if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 491                 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
 492                 return;
 493         }
 494
 495         /* De-linearize incoming message. */
 496         message_to_share_mode_entry(&msg, (char *)data->data);
 497
 498         DEBUG(10, ("Got oplock break message from pid %d: %s/%lu\n",
 499                    (int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id));
 500
 501         fsp = initial_break_processing(msg.id, msg.share_file_id);
 502
 503         if (fsp == NULL) {
 504                 /* a We hit race here. Break messages are sent, and before we
 505                  * get to process this message, we have closed the file. Reply
 506                  * with 'ok, oplock broken' */
 507                 DEBUG(3, ("Did not find fsp\n"));
 508
 509                 /* We just send the same message back. */
 510                 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
 511                                    (uint8 *)data->data,
 512                                    MSG_SMB_SHARE_MODE_ENTRY_SIZE);
 513                 return;
 514         }
 515
 516         if (fsp->sent_oplock_break != NO_BREAK_SENT) {
 517                 /* Remember we have to inform the requesting PID when the
 518                  * client replies */
 519                 msg.pid = src;
 520                 ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
 521                              &fsp->pending_break_messages,
 522                              &fsp->num_pending_break_messages);
 523                 return;
 524         }
 525
 526         if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
 527             !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 528                 DEBUG(3, ("Already downgraded oplock on %s: %s\n",
 529                           file_id_string_tos(&fsp->file_id),
 530                           fsp->fsp_name));
 531                 /* We just send the same message back. */
 532                 messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
 533                                    (uint8 *)data->data,
 534                                    MSG_SMB_SHARE_MODE_ENTRY_SIZE);
 535                 return;
 536         }
 537
 538         if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
 539             !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
 540             !koplocks && /* NOTE: we force levelII off for kernel oplocks -
 541                           * this will change when it is supported */
 542             lp_level2_oplocks(SNUM(fsp->conn))) {
 543                 break_to_level2 = True;
 544         }
 545
 546         break_msg = new_break_smb_message(NULL, fsp, break_to_level2 ?
 547                                           OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
 548         if (break_msg == NULL) {
 549                 exit_server("Could not talloc break_msg\n");
 550         }
 551
 552         /* Need to wait before sending a break message if we sent ourselves this message. */
 553         if (procid_to_pid(&src) == sys_getpid()) {
 554                 wait_before_sending_break();
 555         }
 556
 557         /* Save the server smb signing state. */
 558         sign_state = srv_oplock_set_signing(False);
 559
 560         show_msg(break_msg);
 561         if (!srv_send_smb(smbd_server_fd(),
 562                         break_msg,
 563                         IS_CONN_ENCRYPTED(fsp->conn))) {
 564                 exit_server_cleanly("oplock_break: srv_send_smb failed.");
 565         }
 566
 567         /* Restore the sign state to what it was. */
 568         srv_oplock_set_signing(sign_state);
 569
 570         TALLOC_FREE(break_msg);
 571
 572         fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
 573
 574         msg.pid = src;
 575         ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
 576                      &fsp->pending_break_messages,
 577                      &fsp->num_pending_break_messages);
 578
 579         add_oplock_timeout_handler(fsp);
 580 }
 581
 582 /*******************************************************************
 583  This handles the kernel oplock break message.
 584 *******************************************************************/
 585
 586 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
 587                                         void *private_data,
 588                                         uint32_t msg_type,
 589                                         struct server_id src,
 590                                         DATA_BLOB *data)
 591 {
 592         struct file_id id;
 593         unsigned long file_id;
 594         files_struct *fsp;
 595         char *break_msg;
 596         bool sign_state;
 597
 598         if (data->data == NULL) {
 599                 DEBUG(0, ("Got NULL buffer\n"));
 600                 return;
 601         }
 602
 603         if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
 604                 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
 605                 return;
 606         }
 607
 608         /* Pull the data from the message. */
 609         pull_file_id_16((char *)data->data, &id);
 610         file_id = (unsigned long)IVAL(data->data, 16);
 611
 612         DEBUG(10, ("Got kernel oplock break message from pid %d: %s/%u\n",
 613                    (int)procid_to_pid(&src), file_id_string_tos(&id),
 614                    (unsigned int)file_id));
 615
 616         fsp = initial_break_processing(id, 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 (!srv_send_smb(smbd_server_fd(),
 641                         break_msg,
 642                         IS_CONN_ENCRYPTED(fsp->conn))) {
 643                 exit_server_cleanly("oplock_break: srv_send_smb failed.");
 644         }
 645
 646         /* Restore the sign state to what it was. */
 647         srv_oplock_set_signing(sign_state);
 648
 649         TALLOC_FREE(break_msg);
 650
 651         fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
 652
 653         add_oplock_timeout_handler(fsp);
 654 }
 655
 656 void reply_to_oplock_break_requests(files_struct *fsp)
 657 {
 658         int i;
 659
 660         for (i=0; i<fsp->num_pending_break_messages; i++) {
 661                 struct share_mode_entry *e = &fsp->pending_break_messages[i];
 662                 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
 663
 664                 share_mode_entry_to_message(msg, e);
 665
 666                 messaging_send_buf(smbd_messaging_context(), e->pid,
 667                                    MSG_SMB_BREAK_RESPONSE,
 668                                    (uint8 *)msg,
 669                                    MSG_SMB_SHARE_MODE_ENTRY_SIZE);
 670         }
 671
 672         SAFE_FREE(fsp->pending_break_messages);
 673         fsp->num_pending_break_messages = 0;
 674         if (fsp->oplock_timeout != NULL) {
 675                 /* Remove the timed event handler. */
 676                 TALLOC_FREE(fsp->oplock_timeout);
 677                 fsp->oplock_timeout = NULL;
 678         }
 679         return;
 680 }
 681
 682 static void process_oplock_break_response(struct messaging_context *msg_ctx,
 683                                           void *private_data,
 684                                           uint32_t msg_type,
 685                                           struct server_id src,
 686                                           DATA_BLOB *data)
 687 {
 688         struct share_mode_entry msg;
 689
 690         if (data->data == NULL) {
 691                 DEBUG(0, ("Got NULL buffer\n"));
 692                 return;
 693         }
 694
 695         if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 696                 DEBUG(0, ("Got invalid msg len %u\n",
 697                           (unsigned int)data->length));
 698                 return;
 699         }
 700
 701         /* De-linearize incoming message. */
 702         message_to_share_mode_entry(&msg, (char *)data->data);
 703
 704         DEBUG(10, ("Got oplock break response from pid %d: %s/%lu mid %u\n",
 705                    (int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id,
 706                    (unsigned int)msg.op_mid));
 707
 708         /* Here's the hack from open.c, store the mid in the 'port' field */
 709         schedule_deferred_open_smb_message(msg.op_mid);
 710 }
 711
 712 static void process_open_retry_message(struct messaging_context *msg_ctx,
 713                                        void *private_data,
 714                                        uint32_t msg_type,
 715                                        struct server_id src,
 716                                        DATA_BLOB *data)
 717 {
 718         struct share_mode_entry msg;
 719
 720         if (data->data == NULL) {
 721                 DEBUG(0, ("Got NULL buffer\n"));
 722                 return;
 723         }
 724
 725         if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
 726                 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
 727                 return;
 728         }
 729
 730         /* De-linearize incoming message. */
 731         message_to_share_mode_entry(&msg, (char *)data->data);
 732
 733         DEBUG(10, ("Got open retry msg from pid %d: %s mid %u\n",
 734                    (int)procid_to_pid(&src), file_id_string_tos(&msg.id),
 735                    (unsigned int)msg.op_mid));
 736
 737         schedule_deferred_open_smb_message(msg.op_mid);
 738 }
 739
 740 /****************************************************************************
 741  This function is called on any file modification or lock request. If a file
 742  is level 2 oplocked then it must tell all other level 2 holders to break to
 743  none.
 744 ****************************************************************************/
 745
 746 void release_level_2_oplocks_on_change(files_struct *fsp)
 747 {
 748         int i;
 749         struct share_mode_lock *lck;
 750
 751         /*
 752          * If this file is level II oplocked then we need
 753          * to grab the shared memory lock and inform all
 754          * other files with a level II lock that they need
 755          * to flush their read caches. We keep the lock over
 756          * the shared memory area whilst doing this.
 757          */
 758
 759         if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
 760                 return;
 761
 762         lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
 763                                   NULL);
 764         if (lck == NULL) {
 765                 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
 766                          "share mode entry for file %s.\n", fsp->fsp_name ));
 767                 return;
 768         }
 769
 770         DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
 771                   lck->num_share_modes ));
 772
 773         for(i = 0; i < lck->num_share_modes; i++) {
 774                 struct share_mode_entry *share_entry = &lck->share_modes[i];
 775                 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
 776
 777                 if (!is_valid_share_mode_entry(share_entry)) {
 778                         continue;
 779                 }
 780
 781                 /*
 782                  * As there could have been multiple writes waiting at the
 783                  * lock_share_entry gate we may not be the first to
 784                  * enter. Hence the state of the op_types in the share mode
 785                  * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
 786                  * oplock. It will do no harm to re-send break messages to
 787                  * those smbd's that are still waiting their turn to remove
 788                  * their LEVEL_II state, and also no harm to ignore existing
 789                  * NO_OPLOCK states. JRA.
 790                  */
 791
 792                 DEBUG(10,("release_level_2_oplocks_on_change: "
 793                           "share_entry[%i]->op_type == %d\n",
 794                           i, share_entry->op_type ));
 795
 796                 if (share_entry->op_type == NO_OPLOCK) {
 797                         continue;
 798                 }
 799
 800                 /* Paranoia .... */
 801                 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
 802                         DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
 803                                  "share mode entry %d is an exlusive "
 804                                  "oplock !\n", i ));
 805                         TALLOC_FREE(lck);
 806                         abort();
 807                 }
 808
 809                 share_mode_entry_to_message(msg, share_entry);
 810
 811                 messaging_send_buf(smbd_messaging_context(), share_entry->pid,
 812                                    MSG_SMB_ASYNC_LEVEL2_BREAK,
 813                                    (uint8 *)msg,
 814                                    MSG_SMB_SHARE_MODE_ENTRY_SIZE);
 815         }
 816
 817         /* We let the message receivers handle removing the oplock state
 818            in the share mode lock db. */
 819
 820         TALLOC_FREE(lck);
 821 }
 822
 823 /****************************************************************************
 824  Linearize a share mode entry struct to an internal oplock break message.
 825 ****************************************************************************/
 826
 827 void share_mode_entry_to_message(char *msg, struct share_mode_entry *e)
 828 {
 829         SIVAL(msg,0,(uint32)e->pid.pid);
 830         SSVAL(msg,4,e->op_mid);
 831         SSVAL(msg,6,e->op_type);
 832         SIVAL(msg,8,e->access_mask);
 833         SIVAL(msg,12,e->share_access);
 834         SIVAL(msg,16,e->private_options);
 835         SIVAL(msg,20,(uint32)e->time.tv_sec);
 836         SIVAL(msg,24,(uint32)e->time.tv_usec);
 837         push_file_id_16(msg+28, &e->id);
 838         SIVAL(msg,44,e->share_file_id);
 839         SIVAL(msg,48,e->uid);
 840         SSVAL(msg,52,e->flags);
 841 #ifdef CLUSTER_SUPPORT
 842         SIVAL(msg,54,e->pid.vnn);
 843 #endif
 844 }
 845
 846 /****************************************************************************
 847  De-linearize an internal oplock break message to a share mode entry struct.
 848 ****************************************************************************/
 849
 850 void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
 851 {
 852         e->pid.pid = (pid_t)IVAL(msg,0);
 853         e->op_mid = SVAL(msg,4);
 854         e->op_type = SVAL(msg,6);
 855         e->access_mask = IVAL(msg,8);
 856         e->share_access = IVAL(msg,12);
 857         e->private_options = IVAL(msg,16);
 858         e->time.tv_sec = (time_t)IVAL(msg,20);
 859         e->time.tv_usec = (int)IVAL(msg,24);
 860         pull_file_id_16(msg+28, &e->id);
 861         e->share_file_id = (unsigned long)IVAL(msg,44);
 862         e->uid = (uint32)IVAL(msg,48);
 863         e->flags = (uint16)SVAL(msg,52);
 864 #ifdef CLUSTER_SUPPORT
 865         e->pid.vnn = IVAL(msg,54);
 866 #endif
 867 }
 868
 869 /****************************************************************************
 870  Setup oplocks for this process.
 871 ****************************************************************************/
 872
 873 bool init_oplocks(struct messaging_context *msg_ctx)
 874 {
 875         DEBUG(3,("init_oplocks: initializing messages.\n"));
 876
 877         messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_REQUEST,
 878                            process_oplock_break_message);
 879         messaging_register(msg_ctx, NULL, MSG_SMB_ASYNC_LEVEL2_BREAK,
 880                            process_oplock_async_level2_break_message);
 881         messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_RESPONSE,
 882                            process_oplock_break_response);
 883         messaging_register(msg_ctx, NULL, MSG_SMB_KERNEL_BREAK,
 884                            process_kernel_oplock_break);
 885         messaging_register(msg_ctx, NULL, MSG_SMB_OPEN_RETRY,
 886                            process_open_retry_message);
 887
 888         if (lp_kernel_oplocks()) {
 889 #if HAVE_KERNEL_OPLOCKS_IRIX
 890                 koplocks = irix_init_kernel_oplocks();
 891 #elif HAVE_KERNEL_OPLOCKS_LINUX
 892                 koplocks = linux_init_kernel_oplocks();
 893 #endif
 894         }
 895
 896         return True;
 897 }