source3/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 #include "lib/util/server_id.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "messages.h"
  28 #include "locking/leases_db.h"
  29 #include "../librpc/gen_ndr/ndr_open_files.h"
  30
  31 /*
  32  * helper function used by the kernel oplock backends to post the break message
  33  */
  34 void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
  35 {
  36         uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
  37
  38         /* Put the kernel break info into the message. */
  39         push_file_id_24((char *)msg, &fsp->file_id);
  40         SIVAL(msg,24,fsp->fh->gen_id);
  41
  42         /* Don't need to be root here as we're only ever
  43            sending to ourselves. */
  44
  45         messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
  46                            MSG_SMB_KERNEL_BREAK,
  47                            msg, MSG_SMB_KERNEL_BREAK_SIZE);
  48 }
  49
  50 /****************************************************************************
  51  Attempt to set an oplock on a file. Succeeds if kernel oplocks are
  52  disabled (just sets flags).
  53 ****************************************************************************/
  54
  55 NTSTATUS set_file_oplock(files_struct *fsp)
  56 {
  57         struct smbd_server_connection *sconn = fsp->conn->sconn;
  58         struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
  59         bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
  60                         (koplocks != NULL);
  61
  62         if (fsp->oplock_type == LEVEL_II_OPLOCK && use_kernel) {
  63                 DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
  64                            "don't support them\n"));
  65                 return NT_STATUS_NOT_SUPPORTED;
  66         }
  67
  68         if ((fsp->oplock_type != NO_OPLOCK) &&
  69             use_kernel &&
  70             !koplocks->ops->set_oplock(koplocks, fsp, fsp->oplock_type))
  71         {
  72                 return map_nt_error_from_unix(errno);
  73         }
  74
  75         fsp->sent_oplock_break = NO_BREAK_SENT;
  76         if (fsp->oplock_type == LEVEL_II_OPLOCK) {
  77                 sconn->oplocks.level_II_open++;
  78         } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
  79                 sconn->oplocks.exclusive_open++;
  80         }
  81
  82         DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
  83                     "tv_sec = %x, tv_usec = %x\n",
  84                  fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
  85                  fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
  86                  (int)fsp->open_time.tv_usec ));
  87
  88         return NT_STATUS_OK;
  89 }
  90
  91 static void release_fsp_kernel_oplock(files_struct *fsp)
  92 {
  93         struct smbd_server_connection *sconn = fsp->conn->sconn;
  94         struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
  95         bool use_kernel;
  96
  97         if (koplocks == NULL) {
  98                 return;
  99         }
 100         use_kernel = lp_kernel_oplocks(SNUM(fsp->conn));
 101         if (!use_kernel) {
 102                 return;
 103         }
 104         if (fsp->oplock_type == NO_OPLOCK) {
 105                 return;
 106         }
 107         if (fsp->oplock_type == LEASE_OPLOCK) {
 108                 /*
 109                  * For leases we don't touch kernel oplocks at all
 110                  */
 111                 return;
 112         }
 113
 114         koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
 115 }
 116
 117 /****************************************************************************
 118  Attempt to release an oplock on a file. Decrements oplock count.
 119 ****************************************************************************/
 120
 121 static void release_file_oplock(files_struct *fsp)
 122 {
 123         struct smbd_server_connection *sconn = fsp->conn->sconn;
 124
 125         release_fsp_kernel_oplock(fsp);
 126
 127         if (fsp->oplock_type == LEVEL_II_OPLOCK) {
 128                 sconn->oplocks.level_II_open--;
 129         } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 130                 sconn->oplocks.exclusive_open--;
 131         }
 132
 133         SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
 134         SMB_ASSERT(sconn->oplocks.level_II_open>=0);
 135
 136         fsp->oplock_type = NO_OPLOCK;
 137         fsp->sent_oplock_break = NO_BREAK_SENT;
 138
 139         flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
 140         delete_write_cache(fsp);
 141
 142         TALLOC_FREE(fsp->oplock_timeout);
 143 }
 144
 145 /****************************************************************************
 146  Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
 147 ****************************************************************************/
 148
 149 static void downgrade_file_oplock(files_struct *fsp)
 150 {
 151         struct smbd_server_connection *sconn = fsp->conn->sconn;
 152         struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
 153         bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
 154                         (koplocks != NULL);
 155
 156         if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 157                 DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
 158                 return;
 159         }
 160
 161         if (use_kernel) {
 162                 koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
 163         }
 164         fsp->oplock_type = LEVEL_II_OPLOCK;
 165         sconn->oplocks.exclusive_open--;
 166         sconn->oplocks.level_II_open++;
 167         fsp->sent_oplock_break = NO_BREAK_SENT;
 168
 169         flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
 170         delete_write_cache(fsp);
 171
 172         TALLOC_FREE(fsp->oplock_timeout);
 173 }
 174
 175 uint32_t get_lease_type(const struct share_mode_data *d,
 176                         const struct share_mode_entry *e)
 177 {
 178         if (e->op_type == LEASE_OPLOCK) {
 179                 NTSTATUS status;
 180                 uint32_t current_state;
 181
 182                 status = leases_db_get(
 183                         &e->client_guid,
 184                         &e->lease_key,
 185                         &d->id,
 186                         &current_state,
 187                         NULL,   /* breaking */
 188                         NULL,   /* breaking_to_requested */
 189                         NULL,   /* breaking_to_required */
 190                         NULL,   /* lease_version */
 191                         NULL);  /* epoch */
 192                 SMB_ASSERT(NT_STATUS_IS_OK(status));
 193                 return current_state;
 194         }
 195         return map_oplock_to_lease_type(e->op_type);
 196 }
 197
 198 /****************************************************************************
 199  Remove a file oplock with lock already held. Copes with level II and exclusive.
 200 ****************************************************************************/
 201
 202 bool remove_oplock_under_lock(files_struct *fsp, struct share_mode_lock *lck)
 203 {
 204         bool ret;
 205
 206         ret = remove_share_oplock(lck, fsp);
 207         if (!ret) {
 208                 DBG_ERR("failed to remove share oplock for "
 209                         "file %s, %s, %s\n",
 210                         fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
 211                         file_id_string_tos(&fsp->file_id));
 212         }
 213         release_file_oplock(fsp);
 214
 215         return ret;
 216 }
 217
 218 /****************************************************************************
 219  Remove a file oplock. Copes with level II and exclusive.
 220  Locks then unlocks the share mode lock. Client can decide to go directly
 221  to none even if a "break-to-level II" was sent.
 222 ****************************************************************************/
 223
 224 bool remove_oplock(files_struct *fsp)
 225 {
 226         bool ret;
 227         struct share_mode_lock *lck;
 228
 229         DBG_DEBUG("remove_oplock called for %s\n", fsp_str_dbg(fsp));
 230
 231         /* Remove the oplock flag from the sharemode. */
 232         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 233         if (lck == NULL) {
 234                 DBG_ERR("failed to lock share entry for "
 235                          "file %s\n", fsp_str_dbg(fsp));
 236                 return false;
 237         }
 238
 239         ret = remove_oplock_under_lock(fsp, lck);
 240
 241         TALLOC_FREE(lck);
 242         return ret;
 243 }
 244
 245 /*
 246  * Deal with a reply when a break-to-level II was sent.
 247  */
 248 bool downgrade_oplock(files_struct *fsp)
 249 {
 250         bool ret;
 251         struct share_mode_lock *lck;
 252
 253         DEBUG(10, ("downgrade_oplock called for %s\n",
 254                    fsp_str_dbg(fsp)));
 255
 256         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 257         if (lck == NULL) {
 258                 DEBUG(0,("downgrade_oplock: failed to lock share entry for "
 259                          "file %s\n", fsp_str_dbg(fsp)));
 260                 return False;
 261         }
 262         ret = downgrade_share_oplock(lck, fsp);
 263         if (!ret) {
 264                 DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
 265                          "for file %s, %s, file_id %s\n",
 266                          fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
 267                          file_id_string_tos(&fsp->file_id)));
 268         }
 269         downgrade_file_oplock(fsp);
 270
 271         TALLOC_FREE(lck);
 272         return ret;
 273 }
 274
 275 static void lease_timeout_handler(struct tevent_context *ctx,
 276                                   struct tevent_timer *te,
 277                                   struct timeval now,
 278                                   void *private_data)
 279 {
 280         struct fsp_lease *lease =
 281                 talloc_get_type_abort(private_data,
 282                 struct fsp_lease);
 283         struct files_struct *fsp;
 284         struct share_mode_lock *lck;
 285         uint16_t old_epoch = lease->lease.lease_epoch;
 286
 287         fsp = file_find_one_fsp_from_lease_key(lease->sconn,
 288                                                &lease->lease.lease_key);
 289         if (fsp == NULL) {
 290                 /* race? */
 291                 TALLOC_FREE(lease->timeout);
 292                 return;
 293         }
 294
 295         /*
 296          * Paranoia check: There can only be one fsp_lease per lease
 297          * key
 298          */
 299         SMB_ASSERT(fsp->lease == lease);
 300
 301         lck = get_existing_share_mode_lock(
 302                         talloc_tos(), fsp->file_id);
 303         if (lck == NULL) {
 304                 /* race? */
 305                 TALLOC_FREE(lease->timeout);
 306                 return;
 307         }
 308
 309         fsp_lease_update(fsp);
 310
 311         if (lease->lease.lease_epoch != old_epoch) {
 312                 /*
 313                  * If the epoch changed we need to wait for
 314                  * the next timeout to happen.
 315                  */
 316                 DEBUG(10, ("lease break timeout race (epoch) for file %s - ignoring\n",
 317                            fsp_str_dbg(fsp)));
 318                 TALLOC_FREE(lck);
 319                 return;
 320         }
 321
 322         if (!(lease->lease.lease_flags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)) {
 323                 /*
 324                  * If the epoch changed we need to wait for
 325                  * the next timeout to happen.
 326                  */
 327                 DEBUG(10, ("lease break timeout race (flags) for file %s - ignoring\n",
 328                            fsp_str_dbg(fsp)));
 329                 TALLOC_FREE(lck);
 330                 return;
 331         }
 332
 333         DEBUG(1, ("lease break timed out for file %s -- replying anyway\n",
 334                   fsp_str_dbg(fsp)));
 335         (void)downgrade_lease(lease->sconn->client->connections,
 336                         1,
 337                         &fsp->file_id,
 338                         &lease->lease.lease_key,
 339                         SMB2_LEASE_NONE);
 340
 341         TALLOC_FREE(lck);
 342 }
 343
 344 bool fsp_lease_update(struct files_struct *fsp)
 345 {
 346         const struct GUID *client_guid = fsp_client_guid(fsp);
 347         struct fsp_lease *lease = fsp->lease;
 348         uint32_t current_state;
 349         bool breaking;
 350         uint16_t lease_version, epoch;
 351         NTSTATUS status;
 352
 353         status = leases_db_get(client_guid,
 354                                &fsp->lease->lease.lease_key,
 355                                &fsp->file_id,
 356                                &current_state,
 357                                &breaking,
 358                                NULL, /* breaking_to_requested */
 359                                NULL, /* breaking_to_required */
 360                                &lease_version,
 361                                &epoch);
 362         if (!NT_STATUS_IS_OK(status)) {
 363                 DBG_WARNING("Could not find lease entry: %s\n",
 364                             nt_errstr(status));
 365                 TALLOC_FREE(lease->timeout);
 366                 lease->lease.lease_state = SMB2_LEASE_NONE;
 367                 lease->lease.lease_epoch += 1;
 368                 lease->lease.lease_flags = 0;
 369                 return false;
 370         }
 371
 372         DEBUG(10,("%s: refresh lease state\n", __func__));
 373
 374         /* Ensure we're in sync with current lease state. */
 375         if (lease->lease.lease_epoch != epoch) {
 376                 DEBUG(10,("%s: cancel outdated timeout\n", __func__));
 377                 TALLOC_FREE(lease->timeout);
 378         }
 379         lease->lease.lease_epoch = epoch;
 380         lease->lease.lease_state = current_state;
 381
 382         if (breaking) {
 383                 lease->lease.lease_flags |= SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
 384
 385                 if (lease->timeout == NULL) {
 386                         struct timeval t = timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0);
 387
 388                         DEBUG(10,("%s: setup timeout handler\n", __func__));
 389
 390                         lease->timeout = tevent_add_timer(lease->sconn->ev_ctx,
 391                                                           lease, t,
 392                                                           lease_timeout_handler,
 393                                                           lease);
 394                         if (lease->timeout == NULL) {
 395                                 DEBUG(0, ("%s: Could not add lease timeout handler\n",
 396                                           __func__));
 397                         }
 398                 }
 399         } else {
 400                 lease->lease.lease_flags &= ~SMB2_LEASE_FLAG_BREAK_IN_PROGRESS;
 401                 TALLOC_FREE(lease->timeout);
 402         }
 403
 404         return true;
 405 }
 406
 407 struct downgrade_lease_additional_state {
 408         struct tevent_immediate *im;
 409         struct smbXsrv_connection *xconn;
 410         uint32_t break_flags;
 411         struct smb2_lease_key lease_key;
 412         uint32_t break_from;
 413         uint32_t break_to;
 414         uint16_t new_epoch;
 415 };
 416
 417 static void downgrade_lease_additional_trigger(struct tevent_context *ev,
 418                                                struct tevent_immediate *im,
 419                                                void *private_data)
 420 {
 421         struct downgrade_lease_additional_state *state =
 422                 talloc_get_type_abort(private_data,
 423                 struct downgrade_lease_additional_state);
 424         struct smbXsrv_connection *xconn = state->xconn;
 425         NTSTATUS status;
 426
 427         status = smbd_smb2_send_lease_break(xconn,
 428                                             state->new_epoch,
 429                                             state->break_flags,
 430                                             &state->lease_key,
 431                                             state->break_from,
 432                                             state->break_to);
 433         TALLOC_FREE(state);
 434         if (!NT_STATUS_IS_OK(status)) {
 435                 smbd_server_connection_terminate(xconn,
 436                                                  nt_errstr(status));
 437                 return;
 438         }
 439 }
 440
 441 struct fsps_lease_update_state {
 442         const struct file_id *id;
 443         const struct smb2_lease_key *key;
 444 };
 445
 446 static struct files_struct *fsps_lease_update_fn(
 447         struct files_struct *fsp, void *private_data)
 448 {
 449         struct fsps_lease_update_state *state =
 450                 (struct fsps_lease_update_state *)private_data;
 451
 452         if (fsp->oplock_type != LEASE_OPLOCK) {
 453                 return NULL;
 454         }
 455         if (!smb2_lease_key_equal(&fsp->lease->lease.lease_key, state->key)) {
 456                 return NULL;
 457         }
 458         if (!file_id_equal(&fsp->file_id, state->id)) {
 459                 return NULL;
 460         }
 461
 462         fsp_lease_update(fsp);
 463
 464         return NULL;
 465 }
 466
 467 static void fsps_lease_update(struct smbd_server_connection *sconn,
 468                               const struct file_id *id,
 469                               const struct smb2_lease_key *key)
 470 {
 471         struct fsps_lease_update_state state = { .id = id, .key = key };
 472         files_forall(sconn, fsps_lease_update_fn, &state);
 473 }
 474
 475 NTSTATUS downgrade_lease(struct smbXsrv_connection *xconn,
 476                          uint32_t num_file_ids,
 477                          const struct file_id *ids,
 478                          const struct smb2_lease_key *key,
 479                          uint32_t lease_state)
 480 {
 481         struct smbd_server_connection *sconn = xconn->client->sconn;
 482         const struct GUID *client_guid = NULL;
 483         struct share_mode_lock *lck;
 484         const struct file_id id = ids[0];
 485         uint32_t current_state, breaking_to_requested, breaking_to_required;
 486         bool breaking;
 487         uint16_t lease_version, epoch;
 488         NTSTATUS status;
 489         uint32_t i;
 490
 491         DEBUG(10, ("%s: Downgrading %s to %x\n", __func__,
 492                    file_id_string_tos(&id), (unsigned)lease_state));
 493
 494         lck = get_existing_share_mode_lock(talloc_tos(), id);
 495         if (lck == NULL) {
 496                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 497         }
 498
 499         client_guid = &sconn->client->connections->smb2.client.guid;
 500
 501         status = leases_db_get(client_guid,
 502                                key,
 503                                &id,
 504                                &current_state,
 505                                &breaking,
 506                                &breaking_to_requested,
 507                                &breaking_to_required,
 508                                &lease_version,
 509                                &epoch);
 510         if (!NT_STATUS_IS_OK(status)) {
 511                 DBG_WARNING("leases_db_get returned %s\n",
 512                             nt_errstr(status));
 513                 TALLOC_FREE(lck);
 514                 return status;
 515         }
 516
 517         if (!breaking) {
 518                 DBG_WARNING("Attempt to break from %"PRIu32" to %"PRIu32" - "
 519                             "but we're not in breaking state\n",
 520                             current_state, lease_state);
 521                 TALLOC_FREE(lck);
 522                 return NT_STATUS_UNSUCCESSFUL;
 523         }
 524
 525         /*
 526          * Can't upgrade anything: breaking_to_requested (and current_state)
 527          * must be a strict bitwise superset of new_lease_state
 528          */
 529         if ((lease_state & breaking_to_requested) != lease_state) {
 530                 DBG_WARNING("Attempt to upgrade from %"PRIu32" to %"PRIu32" "
 531                             "- expected %"PRIu32"\n",
 532                             current_state, lease_state,
 533                             breaking_to_requested);
 534                 TALLOC_FREE(lck);
 535                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 536         }
 537
 538         if (current_state != lease_state) {
 539                 current_state = lease_state;
 540         }
 541
 542         status = NT_STATUS_OK;
 543
 544         if ((lease_state & ~breaking_to_required) != 0) {
 545                 struct downgrade_lease_additional_state *state;
 546
 547                 DBG_INFO("lease state %"PRIu32" not fully broken from "
 548                          "%"PRIu32" to %"PRIu32"\n",
 549                          lease_state,
 550                          current_state,
 551                          breaking_to_required);
 552
 553                 breaking_to_requested = breaking_to_required;
 554
 555                 if (current_state & (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
 556                         /*
 557                          * Here we break in steps, as windows does
 558                          * see the breaking3 and v2_breaking3 tests.
 559                          */
 560                         breaking_to_requested |= SMB2_LEASE_READ;
 561                 }
 562
 563                 state = talloc_zero(xconn,
 564                                     struct downgrade_lease_additional_state);
 565                 if (state == NULL) {
 566                         TALLOC_FREE(lck);
 567                         return NT_STATUS_NO_MEMORY;
 568                 }
 569
 570                 state->im = tevent_create_immediate(state);
 571                 if (state->im == NULL) {
 572                         TALLOC_FREE(state);
 573                         TALLOC_FREE(lck);
 574                         return NT_STATUS_NO_MEMORY;
 575                 }
 576
 577                 state->xconn = xconn;
 578                 state->lease_key = *key;
 579                 state->break_from = current_state;
 580                 state->break_to = breaking_to_requested;
 581                 if (lease_version > 1) {
 582                         state->new_epoch = epoch;
 583                 }
 584
 585                 if (current_state & (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
 586                         state->break_flags =
 587                                 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
 588                 } else {
 589                         /*
 590                          * This is an async break without
 591                          * SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED
 592                          *
 593                          * we need to store NONE state in the
 594                          * database.
 595                          */
 596                         current_state = 0;
 597                         breaking_to_requested = 0;
 598                         breaking_to_required = 0;
 599                         breaking = false;
 600
 601                         {
 602                                 NTSTATUS set_status;
 603
 604                                 set_status = leases_db_set(
 605                                         &sconn->client->connections->
 606                                         smb2.client.guid,
 607                                         key,
 608                                         current_state,
 609                                         breaking,
 610                                         breaking_to_requested,
 611                                         breaking_to_required,
 612                                         lease_version,
 613                                         epoch);
 614
 615                                 if (!NT_STATUS_IS_OK(set_status)) {
 616                                         DBG_DEBUG("leases_db_set failed: %s\n",
 617                                                   nt_errstr(set_status));
 618                                         return set_status;
 619                                 }
 620                         }
 621                 }
 622
 623                 tevent_schedule_immediate(state->im,
 624                                           xconn->client->raw_ev_ctx,
 625                                           downgrade_lease_additional_trigger,
 626                                           state);
 627
 628                 status = NT_STATUS_OPLOCK_BREAK_IN_PROGRESS;
 629         } else {
 630                 DBG_DEBUG("breaking from %"PRIu32" to %"PRIu32" - "
 631                           "expected %"PRIu32"\n",
 632                           current_state,
 633                           lease_state,
 634                           breaking_to_requested);
 635
 636                 breaking_to_requested = 0;
 637                 breaking_to_required = 0;
 638                 breaking = false;
 639         }
 640
 641         {
 642                 NTSTATUS set_status;
 643
 644                 set_status = leases_db_set(
 645                         client_guid,
 646                         key,
 647                         current_state,
 648                         breaking,
 649                         breaking_to_requested,
 650                         breaking_to_required,
 651                         lease_version,
 652                         epoch);
 653
 654                 if (!NT_STATUS_IS_OK(set_status)) {
 655                         DBG_DEBUG("leases_db_set failed: %s\n",
 656                                   nt_errstr(set_status));
 657                         TALLOC_FREE(lck);
 658                         return set_status;
 659                 }
 660         }
 661
 662         DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
 663                    file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
 664
 665         /*
 666          * No, we did not modify the share mode array. We did modify
 667          * the leases_db. But without this we don't notify a lease
 668          * break waiter via dbwrap_watch_record. We need to make
 669          * leases_db watched too.
 670          */
 671         lck->data->modified = true;
 672
 673         fsps_lease_update(sconn, &id, key);
 674
 675         TALLOC_FREE(lck);
 676         DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
 677                    file_id_string_tos(&id), (unsigned)lease_state, nt_errstr(status)));
 678
 679         /*
 680          * Dynamic share case. Ensure other opens are copies.
 681          * This will only be breaking to NONE.
 682          */
 683
 684         for (i = 1; i < num_file_ids; i++) {
 685                 lck = get_existing_share_mode_lock(talloc_tos(), ids[i]);
 686                 if (lck == NULL) {
 687                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 688                 }
 689
 690                 fsps_lease_update(sconn, &ids[i], key);
 691
 692                 DEBUG(10, ("%s: Downgrading %s to %x => %s\n", __func__,
 693                         file_id_string_tos(&ids[i]), (unsigned)lease_state, nt_errstr(status)));
 694
 695                 TALLOC_FREE(lck);
 696         }
 697
 698         return status;
 699 }
 700
 701 /****************************************************************************
 702  Set up an oplock break message.
 703 ****************************************************************************/
 704
 705 #define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
 706
 707 static void new_break_message_smb1(files_struct *fsp, int cmd,
 708                                    char result[SMB1_BREAK_MESSAGE_LENGTH])
 709 {
 710         memset(result,'\0',smb_size);
 711         srv_set_message(result,8,0,true);
 712         SCVAL(result,smb_com,SMBlockingX);
 713         SSVAL(result,smb_tid,fsp->conn->cnum);
 714         SSVAL(result,smb_pid,0xFFFF);
 715         SSVAL(result,smb_uid,0);
 716         SSVAL(result,smb_mid,0xFFFF);
 717         SCVAL(result,smb_vwv0,0xFF);
 718         SSVAL(result,smb_vwv2,fsp->fnum);
 719         SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
 720         SCVAL(result,smb_vwv3+1,cmd);
 721 }
 722
 723 /****************************************************************************
 724  Function to do the waiting before sending a local break.
 725 ****************************************************************************/
 726
 727 static void wait_before_sending_break(void)
 728 {
 729         long wait_time = (long)lp_oplock_break_wait_time();
 730
 731         if (wait_time) {
 732                 smb_msleep(wait_time);
 733         }
 734 }
 735
 736 /****************************************************************************
 737  Ensure that we have a valid oplock.
 738 ****************************************************************************/
 739
 740 static files_struct *initial_break_processing(
 741         struct smbd_server_connection *sconn, struct file_id id,
 742         unsigned long file_id)
 743 {
 744         files_struct *fsp = NULL;
 745
 746         DEBUG(3, ("initial_break_processing: called for %s/%u\n"
 747                   "Current oplocks_open (exclusive = %d, levelII = %d)\n",
 748                   file_id_string_tos(&id), (int)file_id,
 749                   sconn->oplocks.exclusive_open,
 750                   sconn->oplocks.level_II_open));
 751
 752         /*
 753          * We need to search the file open table for the
 754          * entry containing this dev and inode, and ensure
 755          * we have an oplock on it.
 756          */
 757
 758         fsp = file_find_dif(sconn, id, file_id);
 759
 760         if(fsp == NULL) {
 761                 /* The file could have been closed in the meantime - return success. */
 762                 DEBUG(3, ("initial_break_processing: cannot find open file "
 763                           "with file_id %s gen_id = %lu, allowing break to "
 764                           "succeed.\n", file_id_string_tos(&id), file_id));
 765                 return NULL;
 766         }
 767
 768         /* Ensure we have an oplock on the file */
 769
 770         /*
 771          * There is a potential race condition in that an oplock could
 772          * have been broken due to another udp request, and yet there are
 773          * still oplock break messages being sent in the udp message
 774          * queue for this file. So return true if we don't have an oplock,
 775          * as we may have just freed it.
 776          */
 777
 778         if(fsp->oplock_type == NO_OPLOCK) {
 779                 DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
 780                           "gen_id = %lu) has no oplock. Allowing break to "
 781                           "succeed regardless.\n", fsp_str_dbg(fsp),
 782                           file_id_string_tos(&id), fsp->fh->gen_id));
 783                 return NULL;
 784         }
 785
 786         return fsp;
 787 }
 788
 789 static void oplock_timeout_handler(struct tevent_context *ctx,
 790                                    struct tevent_timer *te,
 791                                    struct timeval now,
 792                                    void *private_data)
 793 {
 794         files_struct *fsp = (files_struct *)private_data;
 795
 796         SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
 797
 798         /* Remove the timed event handler. */
 799         TALLOC_FREE(fsp->oplock_timeout);
 800         DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
 801                   fsp_str_dbg(fsp)));
 802         remove_oplock(fsp);
 803 }
 804
 805 /*******************************************************************
 806  Add a timeout handler waiting for the client reply.
 807 *******************************************************************/
 808
 809 static void add_oplock_timeout_handler(files_struct *fsp)
 810 {
 811         if (fsp->oplock_timeout != NULL) {
 812                 DEBUG(0, ("Logic problem -- have an oplock event hanging "
 813                           "around\n"));
 814         }
 815
 816         fsp->oplock_timeout =
 817                 tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
 818                                  timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
 819                                  oplock_timeout_handler, fsp);
 820
 821         if (fsp->oplock_timeout == NULL) {
 822                 DEBUG(0, ("Could not add oplock timeout handler\n"));
 823         }
 824 }
 825
 826 static void send_break_message_smb1(files_struct *fsp, int level)
 827 {
 828         struct smbXsrv_connection *xconn = NULL;
 829         char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
 830
 831         /*
 832          * For SMB1 we only have one connection
 833          */
 834         xconn = fsp->conn->sconn->client->connections;
 835
 836         new_break_message_smb1(fsp, level, break_msg);
 837
 838         show_msg(break_msg);
 839         if (!srv_send_smb(xconn,
 840                         break_msg, false, 0,
 841                         IS_CONN_ENCRYPTED(fsp->conn),
 842                         NULL)) {
 843                 exit_server_cleanly("send_break_message_smb1: "
 844                         "srv_send_smb failed.");
 845         }
 846 }
 847
 848 /*******************************************************************
 849  This handles the generic oplock break message from another smbd.
 850 *******************************************************************/
 851
 852 static void process_oplock_break_message(struct messaging_context *msg_ctx,
 853                                          void *private_data,
 854                                          uint32_t msg_type,
 855                                          struct server_id src,
 856                                          DATA_BLOB *data)
 857 {
 858         struct oplock_break_message *msg = NULL;
 859         enum ndr_err_code ndr_err;
 860         files_struct *fsp;
 861         bool use_kernel;
 862         struct smbd_server_connection *sconn =
 863                 talloc_get_type_abort(private_data,
 864                 struct smbd_server_connection);
 865         struct server_id self = messaging_server_id(sconn->msg_ctx);
 866         struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
 867         uint16_t break_from;
 868         uint16_t break_to;
 869         bool break_needed = true;
 870
 871         msg = talloc(talloc_tos(), struct oplock_break_message);
 872         if (msg == NULL) {
 873                 DBG_WARNING("talloc failed\n");
 874                 return;
 875         }
 876
 877         ndr_err = ndr_pull_struct_blob_all(
 878                 data,
 879                 msg,
 880                 msg,
 881                 (ndr_pull_flags_fn_t)ndr_pull_oplock_break_message);
 882         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 883                 DBG_DEBUG("ndr_pull_oplock_break_message failed: %s\n",
 884                           ndr_errstr(ndr_err));
 885                 TALLOC_FREE(msg);
 886                 return;
 887         }
 888         if (DEBUGLEVEL >= 10) {
 889                 struct server_id_buf buf;
 890                 DBG_DEBUG("Got break message from %s\n",
 891                           server_id_str_buf(src, &buf));
 892                 NDR_PRINT_DEBUG(oplock_break_message, msg);
 893         }
 894
 895         break_to = msg->break_to;
 896         fsp = initial_break_processing(sconn, msg->id, msg->share_file_id);
 897
 898         TALLOC_FREE(msg);
 899
 900         if (fsp == NULL) {
 901                 /* We hit a race here. Break messages are sent, and before we
 902                  * get to process this message, we have closed the file. */
 903                 DEBUG(3, ("Did not find fsp\n"));
 904                 return;
 905         }
 906
 907         break_from = fsp_lease_type(fsp);
 908
 909         if (fsp->oplock_type != LEASE_OPLOCK) {
 910                 if (fsp->sent_oplock_break != NO_BREAK_SENT) {
 911                         /*
 912                          * Nothing to do anymore
 913                          */
 914                         DEBUG(10, ("fsp->sent_oplock_break = %d\n",
 915                                    fsp->sent_oplock_break));
 916                         return;
 917                 }
 918         }
 919
 920         if (!(global_client_caps & CAP_LEVEL_II_OPLOCKS)) {
 921                 DEBUG(10, ("client_caps without level2 oplocks\n"));
 922                 break_to &= ~SMB2_LEASE_READ;
 923         }
 924
 925         use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) &&
 926                         (koplocks != NULL);
 927         if (use_kernel) {
 928                 DEBUG(10, ("Kernel oplocks don't allow level2\n"));
 929                 break_to &= ~SMB2_LEASE_READ;
 930         }
 931
 932         if (!lp_level2_oplocks(SNUM(fsp->conn))) {
 933                 DEBUG(10, ("no level2 oplocks by config\n"));
 934                 break_to &= ~SMB2_LEASE_READ;
 935         }
 936
 937         if (fsp->oplock_type == LEASE_OPLOCK) {
 938                 const struct GUID *client_guid = fsp_client_guid(fsp);
 939                 struct share_mode_lock *lck;
 940                 uint32_t current_state;
 941                 uint32_t breaking_to_requested, breaking_to_required;
 942                 bool breaking;
 943                 uint16_t lease_version, epoch;
 944                 NTSTATUS status;
 945
 946                 lck = get_existing_share_mode_lock(
 947                         talloc_tos(), fsp->file_id);
 948                 if (lck == NULL) {
 949                         /*
 950                          * We hit a race here. Break messages are sent, and
 951                          * before we get to process this message, we have closed
 952                          * the file.
 953                          */
 954                         DEBUG(3, ("Did not find share_mode\n"));
 955                         return;
 956                 }
 957
 958                 status = leases_db_get(client_guid,
 959                                        &fsp->lease->lease.lease_key,
 960                                        &fsp->file_id,
 961                                        &current_state,
 962                                        &breaking,
 963                                        &breaking_to_requested,
 964                                        &breaking_to_required,
 965                                        &lease_version,
 966                                        &epoch);
 967                 if (!NT_STATUS_IS_OK(status)) {
 968                         DBG_WARNING("leases_db_get returned %s\n",
 969                                     nt_errstr(status));
 970                         TALLOC_FREE(lck);
 971                         return;
 972                 }
 973
 974                 break_from = current_state;
 975                 break_to &= current_state;
 976
 977                 if (breaking) {
 978                         break_to &= breaking_to_required;
 979                         if (breaking_to_required != break_to) {
 980                                 /*
 981                                  * Note we don't increment the epoch
 982                                  * here, which might be a bug in
 983                                  * Windows too...
 984                                  */
 985                                 breaking_to_required = break_to;
 986                         }
 987                         break_needed = false;
 988                 } else if (current_state == break_to) {
 989                         break_needed = false;
 990                 } else if (current_state == SMB2_LEASE_READ) {
 991                         current_state = SMB2_LEASE_NONE;
 992                         /* Need to increment the epoch */
 993                         epoch += 1;
 994                 } else {
 995                         breaking = true;
 996                         breaking_to_required = break_to;
 997                         breaking_to_requested = break_to;
 998                         /* Need to increment the epoch */
 999                         epoch += 1;
1000                 }
1001
1002                 {
1003                         NTSTATUS set_status;
1004
1005                         set_status = leases_db_set(
1006                                 client_guid,
1007                                 &fsp->lease->lease.lease_key,
1008                                 current_state,
1009                                 breaking,
1010                                 breaking_to_requested,
1011                                 breaking_to_required,
1012                                 lease_version,
1013                                 epoch);
1014
1015                         if (!NT_STATUS_IS_OK(set_status)) {
1016                                 DBG_DEBUG("leases_db_set failed: %s\n",
1017                                           nt_errstr(set_status));
1018                                 return;
1019                         }
1020                 }
1021
1022                 /* Ensure we're in sync with current lease state. */
1023                 fsp_lease_update(fsp);
1024
1025                 TALLOC_FREE(lck);
1026         }
1027
1028         if (!break_needed) {
1029                 DEBUG(10,("%s: skip break\n", __func__));
1030                 return;
1031         }
1032
1033         if ((break_from == SMB2_LEASE_NONE) && !break_needed) {
1034                 DEBUG(3, ("Already downgraded oplock to none on %s: %s\n",
1035                           file_id_string_tos(&fsp->file_id),
1036                           fsp_str_dbg(fsp)));
1037                 return;
1038         }
1039
1040         DEBUG(10, ("break_from=%u, break_to=%u\n",
1041                    (unsigned)break_from, (unsigned)break_to));
1042
1043         if ((break_from == break_to) && !break_needed) {
1044                 DEBUG(3, ("Already downgraded oplock to %u on %s: %s\n",
1045                           (unsigned)break_to,
1046                           file_id_string_tos(&fsp->file_id),
1047                           fsp_str_dbg(fsp)));
1048                 return;
1049         }
1050
1051         /* Need to wait before sending a break
1052            message if we sent ourselves this message. */
1053         if (serverid_equal(&self, &src)) {
1054                 wait_before_sending_break();
1055         }
1056
1057         if (sconn->using_smb2) {
1058                 send_break_message_smb2(fsp, break_from, break_to);
1059         } else {
1060                 send_break_message_smb1(fsp, (break_to & SMB2_LEASE_READ) ?
1061                                         OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
1062         }
1063
1064         if ((break_from == SMB2_LEASE_READ) &&
1065             (break_to == SMB2_LEASE_NONE)) {
1066                 /*
1067                  * This is an async break without a reply and thus no timeout
1068                  *
1069                  * leases are handled above.
1070                  */
1071                 if (fsp->oplock_type != LEASE_OPLOCK) {
1072                         remove_oplock(fsp);
1073                 }
1074                 return;
1075         }
1076         if (fsp->oplock_type == LEASE_OPLOCK) {
1077                 return;
1078         }
1079
1080         fsp->sent_oplock_break = (break_to & SMB2_LEASE_READ) ?
1081                 LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
1082
1083         add_oplock_timeout_handler(fsp);
1084 }
1085
1086 /*******************************************************************
1087  This handles the kernel oplock break message.
1088 *******************************************************************/
1089
1090 static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
1091                                         void *private_data,
1092                                         uint32_t msg_type,
1093                                         struct server_id src,
1094                                         DATA_BLOB *data)
1095 {
1096         struct file_id id;
1097         unsigned long file_id;
1098         files_struct *fsp;
1099         struct smbd_server_connection *sconn =
1100                 talloc_get_type_abort(private_data,
1101                 struct smbd_server_connection);
1102         struct server_id_buf tmp;
1103
1104         if (data->data == NULL) {
1105                 DEBUG(0, ("Got NULL buffer\n"));
1106                 return;
1107         }
1108
1109         if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
1110                 DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
1111                 return;
1112         }
1113
1114         /* Pull the data from the message. */
1115         pull_file_id_24((char *)data->data, &id);
1116         file_id = (unsigned long)IVAL(data->data, 24);
1117
1118         DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
1119                    server_id_str_buf(src, &tmp), file_id_string_tos(&id),
1120                    (unsigned int)file_id));
1121
1122         fsp = initial_break_processing(sconn, id, file_id);
1123
1124         if (fsp == NULL) {
1125                 DEBUG(3, ("Got a kernel oplock break message for a file "
1126                           "I don't know about\n"));
1127                 return;
1128         }
1129
1130         if (fsp->sent_oplock_break != NO_BREAK_SENT) {
1131                 /* This is ok, kernel oplocks come in completely async */
1132                 DEBUG(3, ("Got a kernel oplock request while waiting for a "
1133                           "break reply\n"));
1134                 return;
1135         }
1136
1137         if (sconn->using_smb2) {
1138                 send_break_message_smb2(fsp, 0, OPLOCKLEVEL_NONE);
1139         } else {
1140                 send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
1141         }
1142
1143         fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
1144
1145         add_oplock_timeout_handler(fsp);
1146 }
1147
1148 static void send_break_to_none(struct messaging_context *msg_ctx,
1149                                const struct file_id *id,
1150                                const struct share_mode_entry *e)
1151 {
1152         NTSTATUS status;
1153         status = send_break_message(msg_ctx, id, e, OPLOCK_NONE);
1154         if (!NT_STATUS_IS_OK(status)) {
1155                 DBG_DEBUG("send_break_message failed: %s\n",
1156                           nt_errstr(status));
1157         }
1158 }
1159 struct break_to_none_state {
1160         struct smbd_server_connection *sconn;
1161         struct file_id id;
1162         struct smb2_lease_key lease_key;
1163         struct GUID client_guid;
1164         size_t num_broken;
1165 };
1166
1167 static bool do_break_lease_to_none(struct share_mode_lock *lck,
1168                                    struct share_mode_entry *e,
1169                                    void *private_data)
1170 {
1171         struct break_to_none_state *state = private_data;
1172         uint32_t current_state = 0;
1173         bool our_own;
1174         NTSTATUS status;
1175
1176         DBG_DEBUG("lease_key=%"PRIu64"/%"PRIu64"\n",
1177                   e->lease_key.data[0],
1178                   e->lease_key.data[1]);
1179
1180         status = leases_db_get(&e->client_guid,
1181                                &e->lease_key,
1182                                &state->id,
1183                                &current_state,
1184                                NULL, /* breaking */
1185                                NULL, /* breaking_to_requested */
1186                                NULL, /* breaking_to_required */
1187                                NULL, /* lease_version */
1188                                NULL); /* epoch */
1189         if (!NT_STATUS_IS_OK(status)) {
1190                 DBG_WARNING("leases_db_get failed: %s\n",
1191                             nt_errstr(status));
1192                 return false;
1193         }
1194
1195         if ((current_state & SMB2_LEASE_READ) == 0) {
1196                 return false;
1197         }
1198
1199         our_own = smb2_lease_equal(&state->client_guid,
1200                                    &state->lease_key,
1201                                    &e->client_guid,
1202                                    &e->lease_key);
1203         if (our_own) {
1204                 DEBUG(10, ("Don't break our own lease\n"));
1205                 return false;
1206         }
1207
1208         DBG_DEBUG("Breaking %"PRIu64"/%"PRIu64" to none\n",
1209                   e->lease_key.data[0],
1210                   e->lease_key.data[1]);
1211
1212         send_break_to_none(state->sconn->msg_ctx, &state->id, e);
1213
1214         state->num_broken += 1;
1215
1216         return false;
1217 }
1218
1219 /****************************************************************************
1220  This function is called on any file modification or lock request. If a file
1221  is level 2 oplocked then it must tell all other level 2 holders to break to
1222  none.
1223 ****************************************************************************/
1224
1225 static void contend_level2_oplocks_begin_default(files_struct *fsp,
1226                                               enum level2_contention_type type)
1227 {
1228         struct break_to_none_state state = {
1229                 .sconn = fsp->conn->sconn, .id = fsp->file_id,
1230         };
1231         struct share_mode_lock *lck = NULL;
1232         struct share_mode_data *d = NULL;
1233         bool ok, has_read_lease;
1234         uint32_t i;
1235
1236         /*
1237          * If this file is level II oplocked then we need
1238          * to grab the shared memory lock and inform all
1239          * other files with a level II lock that they need
1240          * to flush their read caches. We keep the lock over
1241          * the shared memory area whilst doing this.
1242          */
1243
1244         if (fsp_lease_type_is_exclusive(fsp)) {
1245                 /*
1246                  * There can't be any level2 oplocks, we're alone.
1247                  */
1248                 return;
1249         }
1250
1251         has_read_lease = file_has_read_lease(fsp);
1252         if (!has_read_lease) {
1253                 DEBUG(10, ("No read oplocks around\n"));
1254                 return;
1255         }
1256
1257         if (fsp->oplock_type == LEASE_OPLOCK) {
1258                 state.client_guid = *fsp_client_guid(fsp);
1259                 state.lease_key = fsp->lease->lease.lease_key;
1260                 DEBUG(10, ("Breaking through lease key %"PRIu64"/%"PRIu64"\n",
1261                            state.lease_key.data[0],
1262                            state.lease_key.data[1]));
1263         }
1264
1265         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
1266         if (lck == NULL) {
1267                 DBG_WARNING("failed to lock share mode entry for file %s.\n",
1268                             file_id_string_tos(&state.id));
1269                 return;
1270         }
1271         d = lck->data;
1272
1273         /*
1274          * Walk leases and oplocks separately: We have to send one break per
1275          * lease. If we have multiple share_mode_entry having a common lease,
1276          * we would break the lease twice if we don't walk the leases list
1277          * separately.
1278          */
1279
1280         ok = share_mode_forall_leases(lck, do_break_lease_to_none, &state);
1281         if (!ok) {
1282                 DBG_WARNING("share_mode_forall_leases failed\n");
1283         }
1284
1285         for(i = 0; i < d->num_share_modes; i++) {
1286                 struct share_mode_entry *e = &d->share_modes[i];
1287
1288                 if (!is_valid_share_mode_entry(e)) {
1289                         continue;
1290                 }
1291                 if (e->op_type == LEASE_OPLOCK) {
1292                         /*
1293                          * Took care of those in the loop above
1294                          */
1295                         continue;
1296                 }
1297
1298                 /*
1299                  * As there could have been multiple writes waiting at the
1300                  * lock_share_entry gate we may not be the first to
1301                  * enter. Hence the state of the op_types in the share mode
1302                  * entries may be partly NO_OPLOCK and partly LEVEL_II
1303                  * oplock. It will do no harm to re-send break messages to
1304                  * those smbd's that are still waiting their turn to remove
1305                  * their LEVEL_II state, and also no harm to ignore existing
1306                  * NO_OPLOCK states. JRA.
1307                  */
1308
1309                 DEBUG(10, ("%s: share_entry[%i]->op_type == %d\n", __func__,
1310                            i, e->op_type ));
1311
1312                 if (e->op_type == NO_OPLOCK) {
1313                         continue;
1314                 }
1315
1316                 /* Paranoia .... */
1317                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1318                         DEBUG(0,("%s: PANIC. "
1319                                  "share mode entry %d is an exclusive "
1320                                  "oplock !\n", __func__, i ));
1321                         TALLOC_FREE(lck);
1322                         abort();
1323                 }
1324
1325                 send_break_to_none(state.sconn->msg_ctx, &state.id, e);
1326                 state.num_broken += 1;
1327         }
1328
1329         if (state.num_broken == 0) {
1330                 /*
1331                  * Lazy update here. It might be that the read lease
1332                  * has gone in the meantime.
1333                  */
1334                 d->flags &= ~SHARE_MODE_HAS_READ_LEASE;
1335                 d->modified = true;
1336         }
1337
1338         TALLOC_FREE(lck);
1339 }
1340
1341 void smbd_contend_level2_oplocks_begin(files_struct *fsp,
1342                                   enum level2_contention_type type)
1343 {
1344         contend_level2_oplocks_begin_default(fsp, type);
1345 }
1346
1347 void smbd_contend_level2_oplocks_end(files_struct *fsp,
1348                                 enum level2_contention_type type)
1349 {
1350         return;
1351 }
1352
1353 /****************************************************************************
1354  Linearize a share mode entry struct to an internal oplock break message.
1355 ****************************************************************************/
1356
1357 void share_mode_entry_to_message(char *msg, const struct file_id *id,
1358                                  const struct share_mode_entry *e)
1359 {
1360         SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32_t)e->pid.pid);
1361         SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
1362         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
1363         SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
1364         SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
1365         SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
1366         SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
1367         SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
1368         /*
1369          * "id" used to be part of share_mode_entry, thus the strange
1370          * place to put this. Feel free to move somewhere else :-)
1371          */
1372         push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, id);
1373         SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
1374         SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
1375         SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
1376         SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
1377         SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
1378 }
1379
1380 /****************************************************************************
1381  De-linearize an internal oplock break message to a share mode entry struct.
1382 ****************************************************************************/
1383
1384 void message_to_share_mode_entry(struct file_id *id,
1385                                  struct share_mode_entry *e,
1386                                  const char *msg)
1387 {
1388         e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
1389         e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
1390         e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
1391         e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
1392         e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
1393         e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
1394         e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
1395         e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
1396         /*
1397          * "id" used to be part of share_mode_entry, thus the strange
1398          * place to put this. Feel free to move somewhere else :-)
1399          */
1400         pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, id);
1401         e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
1402         e->uid = (uint32_t)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
1403         e->flags = (uint16_t)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
1404         e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
1405         e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
1406 }
1407
1408 /****************************************************************************
1409  Setup oplocks for this process.
1410 ****************************************************************************/
1411
1412 bool init_oplocks(struct smbd_server_connection *sconn)
1413 {
1414         DEBUG(3,("init_oplocks: initializing messages.\n"));
1415
1416         messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
1417                            process_oplock_break_message);
1418         messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
1419                            process_kernel_oplock_break);
1420         return true;
1421 }
1422
1423 void init_kernel_oplocks(struct smbd_server_connection *sconn)
1424 {
1425         struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
1426
1427         /* only initialize once */
1428         if (koplocks == NULL) {
1429 #ifdef HAVE_KERNEL_OPLOCKS_LINUX
1430                 koplocks = linux_init_kernel_oplocks(sconn);
1431 #endif
1432                 sconn->oplocks.kernel_ops = koplocks;
1433         }
1434 }