source3/smbd/smb2_lock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   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 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../lib/util/tevent_ntstatus.h"
  27 #include "messages.h"
  28
  29 struct smbd_smb2_lock_element {
  30         uint64_t offset;
  31         uint64_t length;
  32         uint32_t flags;
  33 };
  34
  35 struct smbd_smb2_lock_state {
  36         struct smbd_smb2_request *smb2req;
  37         struct smb_request *smb1req;
  38         struct blocking_lock_record *blr;
  39         uint16_t lock_count;
  40         struct smbd_lock_element *locks;
  41 };
  42
  43 static void remove_pending_lock(struct smbd_smb2_lock_state *state,
  44                                 struct blocking_lock_record *blr);
  45
  46 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
  47                                                  struct tevent_context *ev,
  48                                                  struct smbd_smb2_request *smb2req,
  49                                                  struct files_struct *in_fsp,
  50                                                  uint16_t in_lock_count,
  51                                                  struct smbd_smb2_lock_element *in_locks);
  52 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req);
  53
  54 static void smbd_smb2_request_lock_done(struct tevent_req *subreq);
  55 NTSTATUS smbd_smb2_request_process_lock(struct smbd_smb2_request *req)
  56 {
  57         const uint8_t *inbody;
  58         uint16_t in_lock_count;
  59         uint64_t in_file_id_persistent;
  60         uint64_t in_file_id_volatile;
  61         struct files_struct *in_fsp;
  62         struct smbd_smb2_lock_element *in_locks;
  63         struct tevent_req *subreq;
  64         const uint8_t *lock_buffer;
  65         uint16_t l;
  66         NTSTATUS status;
  67
  68         status = smbd_smb2_request_verify_sizes(req, 0x30);
  69         if (!NT_STATUS_IS_OK(status)) {
  70                 return smbd_smb2_request_error(req, status);
  71         }
  72         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  73
  74         in_lock_count                   = CVAL(inbody, 0x02);
  75         /* 0x04 - 4 bytes reserved */
  76         in_file_id_persistent           = BVAL(inbody, 0x08);
  77         in_file_id_volatile             = BVAL(inbody, 0x10);
  78
  79         if (in_lock_count < 1) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (((in_lock_count - 1) * 0x18) > SMBD_SMB2_IN_DYN_LEN(req)) {
  84                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_locks = talloc_array(req, struct smbd_smb2_lock_element,
  88                                 in_lock_count);
  89         if (in_locks == NULL) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  91         }
  92
  93         l = 0;
  94         lock_buffer = inbody + 0x18;
  95
  96         in_locks[l].offset      = BVAL(lock_buffer, 0x00);
  97         in_locks[l].length      = BVAL(lock_buffer, 0x08);
  98         in_locks[l].flags       = IVAL(lock_buffer, 0x10);
  99         /* 0x14 - 4 reserved bytes */
 100
 101         lock_buffer = SMBD_SMB2_IN_DYN_PTR(req);
 102
 103         for (l=1; l < in_lock_count; l++) {
 104                 in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 105                 in_locks[l].length      = BVAL(lock_buffer, 0x08);
 106                 in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 107                 /* 0x14 - 4 reserved bytes */
 108
 109                 lock_buffer += 0x18;
 110         }
 111
 112         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 113         if (in_fsp == NULL) {
 114                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 115         }
 116
 117         subreq = smbd_smb2_lock_send(req, req->sconn->ev_ctx,
 118                                      req, in_fsp,
 119                                      in_lock_count,
 120                                      in_locks);
 121         if (subreq == NULL) {
 122                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 123         }
 124         tevent_req_set_callback(subreq, smbd_smb2_request_lock_done, req);
 125
 126         return smbd_smb2_request_pending_queue(req, subreq, 500);
 127 }
 128
 129 static void smbd_smb2_request_lock_done(struct tevent_req *subreq)
 130 {
 131         struct smbd_smb2_request *smb2req = tevent_req_callback_data(subreq,
 132                                         struct smbd_smb2_request);
 133         DATA_BLOB outbody;
 134         NTSTATUS status;
 135         NTSTATUS error; /* transport error */
 136
 137         status = smbd_smb2_lock_recv(subreq);
 138         TALLOC_FREE(subreq);
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 error = smbd_smb2_request_error(smb2req, status);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(smb2req->sconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 150         if (outbody.data == NULL) {
 151                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 152                 if (!NT_STATUS_IS_OK(error)) {
 153                         smbd_server_connection_terminate(smb2req->sconn,
 154                                                          nt_errstr(error));
 155                         return;
 156                 }
 157                 return;
 158         }
 159
 160         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 161         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 162
 163         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 164         if (!NT_STATUS_IS_OK(error)) {
 165                 smbd_server_connection_terminate(smb2req->sconn,
 166                                                  nt_errstr(error));
 167                 return;
 168         }
 169 }
 170
 171 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
 172                                                  struct tevent_context *ev,
 173                                                  struct smbd_smb2_request *smb2req,
 174                                                  struct files_struct *fsp,
 175                                                  uint16_t in_lock_count,
 176                                                  struct smbd_smb2_lock_element *in_locks)
 177 {
 178         struct tevent_req *req;
 179         struct smbd_smb2_lock_state *state;
 180         struct smb_request *smb1req;
 181         int32_t timeout = -1;
 182         bool isunlock = false;
 183         uint16_t i;
 184         struct smbd_lock_element *locks;
 185         NTSTATUS status;
 186         bool async = false;
 187
 188         req = tevent_req_create(mem_ctx, &state,
 189                         struct smbd_smb2_lock_state);
 190         if (req == NULL) {
 191                 return NULL;
 192         }
 193         state->smb2req = smb2req;
 194         smb2req->subreq = req; /* So we can find this when going async. */
 195
 196         smb1req = smbd_smb2_fake_smb_request(smb2req);
 197         if (tevent_req_nomem(smb1req, req)) {
 198                 return tevent_req_post(req, ev);
 199         }
 200         state->smb1req = smb1req;
 201
 202         DEBUG(10,("smbd_smb2_lock_send: %s - %s\n",
 203                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 204
 205         locks = talloc_array(state, struct smbd_lock_element, in_lock_count);
 206         if (locks == NULL) {
 207                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 208                 return tevent_req_post(req, ev);
 209         }
 210
 211         switch (in_locks[0].flags) {
 212         case SMB2_LOCK_FLAG_SHARED:
 213         case SMB2_LOCK_FLAG_EXCLUSIVE:
 214                 if (in_lock_count > 1) {
 215                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 216                         return tevent_req_post(req, ev);
 217                 }
 218                 timeout = -1;
 219                 break;
 220
 221         case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 222         case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 223                 timeout = 0;
 224                 break;
 225
 226         case SMB2_LOCK_FLAG_UNLOCK:
 227                 /* only the first lock gives the UNLOCK bit - see
 228                    MS-SMB2 3.3.5.14 */
 229                 isunlock = true;
 230                 timeout = 0;
 231                 break;
 232
 233         default:
 234                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 235                 return tevent_req_post(req, ev);
 236         }
 237
 238         if (!isunlock && (in_lock_count > 1)) {
 239
 240                 /*
 241                  * 3.3.5.14.2 says we SHOULD fail with INVALID_PARAMETER if we
 242                  * have more than one lock and one of those is blocking.
 243                  */
 244
 245                 for (i=0; i<in_lock_count; i++) {
 246                         uint32_t flags = in_locks[i].flags;
 247
 248                         if ((flags & SMB2_LOCK_FLAG_FAIL_IMMEDIATELY) == 0) {
 249                                 tevent_req_nterror(
 250                                         req, NT_STATUS_INVALID_PARAMETER);
 251                                 return tevent_req_post(req, ev);
 252                         }
 253                 }
 254         }
 255
 256         for (i=0; i<in_lock_count; i++) {
 257                 bool invalid = false;
 258
 259                 switch (in_locks[i].flags) {
 260                 case SMB2_LOCK_FLAG_SHARED:
 261                 case SMB2_LOCK_FLAG_EXCLUSIVE:
 262                         if (isunlock) {
 263                                 invalid = true;
 264                                 break;
 265                         }
 266                         break;
 267
 268                 case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 269                 case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 270                         if (isunlock) {
 271                                 invalid = true;
 272                         }
 273                         break;
 274
 275                 case SMB2_LOCK_FLAG_UNLOCK:
 276                         if (!isunlock) {
 277                                 tevent_req_nterror(req,
 278                                                    NT_STATUS_INVALID_PARAMETER);
 279                                 return tevent_req_post(req, ev);
 280                         }
 281                         break;
 282
 283                 default:
 284                         if (isunlock) {
 285                                 /*
 286                                  * is the first element was a UNLOCK
 287                                  * we need to deferr the error response
 288                                  * to the backend, because we need to process
 289                                  * all unlock elements before
 290                                  */
 291                                 invalid = true;
 292                                 break;
 293                         }
 294                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 295                         return tevent_req_post(req, ev);
 296                 }
 297
 298                 locks[i].smblctx = fsp->op->global->open_persistent_id;
 299                 locks[i].offset = in_locks[i].offset;
 300                 locks[i].count  = in_locks[i].length;
 301
 302                 if (in_locks[i].flags & SMB2_LOCK_FLAG_EXCLUSIVE) {
 303                         locks[i].brltype = WRITE_LOCK;
 304                 } else if (in_locks[i].flags & SMB2_LOCK_FLAG_SHARED) {
 305                         locks[i].brltype = READ_LOCK;
 306                 } else if (invalid) {
 307                         /*
 308                          * this is an invalid UNLOCK element
 309                          * and the backend needs to test for
 310                          * brltype != UNLOCK_LOCK and return
 311                          * NT_STATUS_INVALID_PARAMER
 312                          */
 313                         locks[i].brltype = READ_LOCK;
 314                 } else {
 315                         locks[i].brltype = UNLOCK_LOCK;
 316                 }
 317
 318                 DEBUG(10,("smbd_smb2_lock_send: index %d offset=%llu, count=%llu, "
 319                         "smblctx = %llu type %d\n",
 320                         i,
 321                         (unsigned long long)locks[i].offset,
 322                         (unsigned long long)locks[i].count,
 323                         (unsigned long long)locks[i].smblctx,
 324                         (int)locks[i].brltype ));
 325         }
 326
 327         state->locks = locks;
 328         state->lock_count = in_lock_count;
 329
 330         if (isunlock) {
 331                 status = smbd_do_locking(smb1req, fsp,
 332                                          0,
 333                                          timeout,
 334                                          in_lock_count,
 335                                          locks,
 336                                          0,
 337                                          NULL,
 338                                          &async);
 339         } else {
 340                 status = smbd_do_locking(smb1req, fsp,
 341                                          0,
 342                                          timeout,
 343                                          0,
 344                                          NULL,
 345                                          in_lock_count,
 346                                          locks,
 347                                          &async);
 348         }
 349         if (!NT_STATUS_IS_OK(status)) {
 350                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
 351                        status = NT_STATUS_LOCK_NOT_GRANTED;
 352                 }
 353                 tevent_req_nterror(req, status);
 354                 return tevent_req_post(req, ev);
 355         }
 356
 357         if (async) {
 358                 return req;
 359         }
 360
 361         tevent_req_done(req);
 362         return tevent_req_post(req, ev);
 363 }
 364
 365 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req)
 366 {
 367         NTSTATUS status;
 368
 369         if (tevent_req_is_nterror(req, &status)) {
 370                 tevent_req_received(req);
 371                 return status;
 372         }
 373
 374         tevent_req_received(req);
 375         return NT_STATUS_OK;
 376 }
 377
 378 /****************************************************************
 379  Cancel an outstanding blocking lock request.
 380 *****************************************************************/
 381
 382 static bool smbd_smb2_lock_cancel(struct tevent_req *req)
 383 {
 384         struct smbd_smb2_request *smb2req = NULL;
 385         struct smbd_smb2_lock_state *state = tevent_req_data(req,
 386                                 struct smbd_smb2_lock_state);
 387         if (!state) {
 388                 return false;
 389         }
 390
 391         if (!state->smb2req) {
 392                 return false;
 393         }
 394
 395         smb2req = state->smb2req;
 396
 397         remove_pending_lock(state, state->blr);
 398         tevent_req_defer_callback(req, smb2req->sconn->ev_ctx);
 399
 400         /*
 401          * If the request is canceled because of logoff, tdis or close
 402          * the status is NT_STATUS_RANGE_NOT_LOCKED instead of
 403          * NT_STATUS_CANCELLED.
 404          *
 405          * Note that the close case is handled in
 406          * cancel_pending_lock_requests_by_fid_smb2(SHUTDOWN_CLOSE)
 407          * for now.
 408          */
 409         if (!NT_STATUS_IS_OK(smb2req->session->status)) {
 410                 tevent_req_nterror(req, NT_STATUS_RANGE_NOT_LOCKED);
 411                 return true;
 412         }
 413
 414         if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
 415                 tevent_req_nterror(req, NT_STATUS_RANGE_NOT_LOCKED);
 416                 return true;
 417         }
 418
 419         tevent_req_nterror(req, NT_STATUS_CANCELLED);
 420         return true;
 421 }
 422
 423 /****************************************************************
 424  Got a message saying someone unlocked a file. Re-schedule all
 425  blocking lock requests as we don't know if anything overlapped.
 426 *****************************************************************/
 427
 428 static void received_unlock_msg(struct messaging_context *msg,
 429                                 void *private_data,
 430                                 uint32_t msg_type,
 431                                 struct server_id server_id,
 432                                 DATA_BLOB *data)
 433 {
 434         struct smbd_server_connection *sconn =
 435                 talloc_get_type_abort(private_data,
 436                 struct smbd_server_connection);
 437
 438         DEBUG(10,("received_unlock_msg (SMB2)\n"));
 439
 440         process_blocking_lock_queue_smb2(sconn, timeval_current());
 441 }
 442
 443 /****************************************************************
 444  Function to get the blr on a pending record.
 445 *****************************************************************/
 446
 447 struct blocking_lock_record *get_pending_smb2req_blr(struct smbd_smb2_request *smb2req)
 448 {
 449         struct smbd_smb2_lock_state *state = NULL;
 450         const uint8_t *inhdr;
 451
 452         if (!smb2req) {
 453                 return NULL;
 454         }
 455         if (smb2req->subreq == NULL) {
 456                 return NULL;
 457         }
 458         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 459                 return NULL;
 460         }
 461         inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 462         if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 463                 return NULL;
 464         }
 465         state = tevent_req_data(smb2req->subreq,
 466                         struct smbd_smb2_lock_state);
 467         if (!state) {
 468                 return NULL;
 469         }
 470         return state->blr;
 471 }
 472 /****************************************************************
 473  Set up the next brl timeout.
 474 *****************************************************************/
 475
 476 static bool recalc_smb2_brl_timeout(struct smbd_server_connection *sconn)
 477 {
 478         struct smbd_smb2_request *smb2req;
 479         struct timeval next_timeout = timeval_zero();
 480         int max_brl_timeout = lp_parm_int(-1, "brl", "recalctime", 5);
 481
 482         TALLOC_FREE(sconn->smb2.locks.brl_timeout);
 483
 484         for (smb2req = sconn->smb2.requests; smb2req; smb2req = smb2req->next) {
 485                 struct blocking_lock_record *blr =
 486                         get_pending_smb2req_blr(smb2req);
 487                 if (!blr) {
 488                         continue;
 489                 }
 490                 if (timeval_is_zero(&blr->expire_time)) {
 491                         /*
 492                          * If we're blocked on pid 0xFFFFFFFFFFFFFFFFLL this is
 493                          * a POSIX lock, so calculate a timeout of
 494                          * 10 seconds into the future.
 495                          */
 496                         if (blr->blocking_smblctx == 0xFFFFFFFFFFFFFFFFLL) {
 497                                 struct timeval psx_to = timeval_current_ofs(10, 0);
 498                                 next_timeout = timeval_brl_min(&next_timeout, &psx_to);
 499                         }
 500
 501                         continue;
 502                 }
 503
 504                 next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
 505         }
 506
 507         if (timeval_is_zero(&next_timeout)) {
 508                 DEBUG(10, ("recalc_smb2_brl_timeout:Next "
 509                         "timeout = Infinite.\n"));
 510                 return true;
 511         }
 512
 513         /*
 514          * To account for unclean shutdowns by clients we need a
 515          * maximum timeout that we use for checking pending locks. If
 516          * we have any pending locks at all, then check if the pending
 517          * lock can continue at least every brl:recalctime seconds
 518          * (default 5 seconds).
 519          *
 520          * This saves us needing to do a message_send_all() in the
 521          * SIGCHLD handler in the parent daemon. That
 522          * message_send_all() caused O(n^2) work to be done when IP
 523          * failovers happened in clustered Samba, which could make the
 524          * entire system unusable for many minutes.
 525          */
 526
 527         if (max_brl_timeout > 0) {
 528                 struct timeval min_to = timeval_current_ofs(max_brl_timeout, 0);
 529                 next_timeout = timeval_brl_min(&next_timeout, &min_to);
 530         }
 531
 532         if (DEBUGLVL(10)) {
 533                 struct timeval cur, from_now;
 534
 535                 cur = timeval_current();
 536                 from_now = timeval_until(&cur, &next_timeout);
 537                 DEBUG(10, ("recalc_smb2_brl_timeout: Next "
 538                         "timeout = %d.%d seconds from now.\n",
 539                         (int)from_now.tv_sec, (int)from_now.tv_usec));
 540         }
 541
 542         sconn->smb2.locks.brl_timeout = tevent_add_timer(
 543                                 sconn->ev_ctx,
 544                                 NULL,
 545                                 next_timeout,
 546                                 brl_timeout_fn,
 547                                 sconn);
 548         if (!sconn->smb2.locks.brl_timeout) {
 549                 return false;
 550         }
 551         return true;
 552 }
 553
 554 /****************************************************************
 555  Get an SMB2 lock reqeust to go async. lock_timeout should
 556  always be -1 here.
 557 *****************************************************************/
 558
 559 bool push_blocking_lock_request_smb2( struct byte_range_lock *br_lck,
 560                                 struct smb_request *smb1req,
 561                                 files_struct *fsp,
 562                                 int lock_timeout,
 563                                 int lock_num,
 564                                 uint64_t smblctx,
 565                                 enum brl_type lock_type,
 566                                 enum brl_flavour lock_flav,
 567                                 uint64_t offset,
 568                                 uint64_t count,
 569                                 uint64_t blocking_smblctx)
 570 {
 571         struct smbd_server_connection *sconn = smb1req->sconn;
 572         struct smbd_smb2_request *smb2req = smb1req->smb2req;
 573         struct tevent_req *req = NULL;
 574         struct smbd_smb2_lock_state *state = NULL;
 575         struct blocking_lock_record *blr = NULL;
 576         NTSTATUS status = NT_STATUS_OK;
 577
 578         if (!smb2req) {
 579                 return false;
 580         }
 581         req = smb2req->subreq;
 582         if (!req) {
 583                 return false;
 584         }
 585         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 586                 return false;
 587         }
 588         state = tevent_req_data(req, struct smbd_smb2_lock_state);
 589         if (!state) {
 590                 return false;
 591         }
 592
 593         blr = talloc_zero(state, struct blocking_lock_record);
 594         if (!blr) {
 595                 return false;
 596         }
 597         blr->fsp = fsp;
 598
 599         if (lock_timeout == -1) {
 600                 blr->expire_time.tv_sec = 0;
 601                 blr->expire_time.tv_usec = 0; /* Never expire. */
 602         } else {
 603                 blr->expire_time = timeval_current_ofs_msec(lock_timeout);
 604         }
 605
 606         blr->lock_num = lock_num;
 607         blr->smblctx = smblctx;
 608         blr->blocking_smblctx = blocking_smblctx;
 609         blr->lock_flav = lock_flav;
 610         blr->lock_type = lock_type;
 611         blr->offset = offset;
 612         blr->count = count;
 613
 614         /* Specific brl_lock() implementations can fill this in. */
 615         blr->blr_private = NULL;
 616
 617         /* Add a pending lock record for this. */
 618         status = brl_lock(sconn->msg_ctx,
 619                         br_lck,
 620                         smblctx,
 621                         messaging_server_id(sconn->msg_ctx),
 622                         offset,
 623                         count,
 624                         lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
 625                         blr->lock_flav,
 626                         true,
 627                         NULL,
 628                         blr);
 629
 630         if (!NT_STATUS_IS_OK(status)) {
 631                 DEBUG(0,("push_blocking_lock_request_smb2: "
 632                         "failed to add PENDING_LOCK record.\n"));
 633                 TALLOC_FREE(blr);
 634                 return false;
 635         }
 636         state->blr = blr;
 637
 638         DEBUG(10,("push_blocking_lock_request_smb2: file %s timeout %d\n",
 639                 fsp_str_dbg(fsp),
 640                 lock_timeout ));
 641
 642         recalc_smb2_brl_timeout(sconn);
 643
 644         /* Ensure we'll receive messages when this is unlocked. */
 645         if (!sconn->smb2.locks.blocking_lock_unlock_state) {
 646                 messaging_register(sconn->msg_ctx, sconn,
 647                                 MSG_SMB_UNLOCK, received_unlock_msg);
 648                 sconn->smb2.locks.blocking_lock_unlock_state = true;
 649         }
 650
 651         /* allow this request to be canceled */
 652         tevent_req_set_cancel_fn(req, smbd_smb2_lock_cancel);
 653
 654         return true;
 655 }
 656
 657 /****************************************************************
 658  Remove a pending lock record under lock.
 659 *****************************************************************/
 660
 661 static void remove_pending_lock(struct smbd_smb2_lock_state *state,
 662                         struct blocking_lock_record *blr)
 663 {
 664         struct byte_range_lock *br_lck = brl_get_locks(
 665                                 state, blr->fsp);
 666
 667         DEBUG(10, ("remove_pending_lock: BLR = %p\n", blr));
 668
 669         if (br_lck) {
 670                 brl_lock_cancel(br_lck,
 671                                 blr->smblctx,
 672                                 messaging_server_id(blr->fsp->conn->sconn->msg_ctx),
 673                                 blr->offset,
 674                                 blr->count,
 675                                 blr->lock_flav,
 676                                 blr);
 677                 TALLOC_FREE(br_lck);
 678         }
 679 }
 680
 681 /****************************************************************
 682  Re-proccess a blocking lock request.
 683  This is equivalent to process_lockingX() inside smbd/blocking.c
 684 *****************************************************************/
 685
 686 static void reprocess_blocked_smb2_lock(struct smbd_smb2_request *smb2req,
 687                                 struct timeval tv_curr)
 688 {
 689         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 690         struct blocking_lock_record *blr = NULL;
 691         struct smbd_smb2_lock_state *state = NULL;
 692         struct byte_range_lock *br_lck = NULL;
 693         struct smbd_lock_element *e = NULL;
 694         files_struct *fsp = NULL;
 695
 696         if (!smb2req->subreq) {
 697                 return;
 698         }
 699         state = tevent_req_data(smb2req->subreq, struct smbd_smb2_lock_state);
 700         if (!state) {
 701                 return;
 702         }
 703
 704         blr = state->blr;
 705         fsp = blr->fsp;
 706
 707         /* We can only have one blocked lock in SMB2. */
 708         SMB_ASSERT(state->lock_count == 1);
 709         SMB_ASSERT(blr->lock_num == 0);
 710
 711         /* Try and get the outstanding lock. */
 712         e = &state->locks[blr->lock_num];
 713
 714         br_lck = do_lock(fsp->conn->sconn->msg_ctx,
 715                         fsp,
 716                         e->smblctx,
 717                         e->count,
 718                         e->offset,
 719                         e->brltype,
 720                         WINDOWS_LOCK,
 721                         true,
 722                         &status,
 723                         &blr->blocking_smblctx,
 724                         blr);
 725
 726         TALLOC_FREE(br_lck);
 727
 728         if (NT_STATUS_IS_OK(status)) {
 729                 /*
 730                  * Success - we got the lock.
 731                  */
 732
 733                 DEBUG(3,("reprocess_blocked_smb2_lock SUCCESS file = %s, "
 734                         "%s, num_locks=%d\n",
 735                         fsp_str_dbg(fsp),
 736                         fsp_fnum_dbg(fsp),
 737                         (int)state->lock_count));
 738
 739                 remove_pending_lock(state, blr);
 740                 tevent_req_done(smb2req->subreq);
 741                 return;
 742         }
 743
 744         if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 745                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 746                 /*
 747                  * We have other than a "can't get lock"
 748                  * error. Return an error.
 749                  */
 750                 remove_pending_lock(state, blr);
 751                 tevent_req_nterror(smb2req->subreq, status);
 752                 return;
 753         }
 754
 755         /*
 756          * We couldn't get the lock for this record.
 757          * If the time has expired, return a lock error.
 758          */
 759
 760         if (!timeval_is_zero(&blr->expire_time) &&
 761                         timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
 762                 remove_pending_lock(state, blr);
 763                 tevent_req_nterror(smb2req->subreq, NT_STATUS_LOCK_NOT_GRANTED);
 764                 return;
 765         }
 766
 767         /*
 768          * Still can't get the lock - keep waiting.
 769          */
 770
 771         DEBUG(10,("reprocess_blocked_smb2_lock: failed to get lock "
 772                 "for file %s, %s. Still waiting....\n",
 773                 fsp_str_dbg(fsp),
 774                 fsp_fnum_dbg(fsp)));
 775
 776         return;
 777 }
 778
 779 /****************************************************************
 780  Attempt to proccess all outstanding blocking locks pending on
 781  the request queue.
 782 *****************************************************************/
 783
 784 void process_blocking_lock_queue_smb2(
 785         struct smbd_server_connection *sconn, struct timeval tv_curr)
 786 {
 787         struct smbd_smb2_request *smb2req, *nextreq;
 788
 789         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 790                 const uint8_t *inhdr;
 791
 792                 nextreq = smb2req->next;
 793
 794                 if (smb2req->subreq == NULL) {
 795                         /* This message has been processed. */
 796                         continue;
 797                 }
 798                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 799                         /* This message has been processed. */
 800                         continue;
 801                 }
 802
 803                 inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 804                 if (SVAL(inhdr, SMB2_HDR_OPCODE) == SMB2_OP_LOCK) {
 805                         reprocess_blocked_smb2_lock(smb2req, tv_curr);
 806                 }
 807         }
 808
 809         recalc_smb2_brl_timeout(sconn);
 810 }
 811
 812 /****************************************************************************
 813  Remove any locks on this fd. Called from file_close().
 814 ****************************************************************************/
 815
 816 void cancel_pending_lock_requests_by_fid_smb2(files_struct *fsp,
 817                         struct byte_range_lock *br_lck,
 818                         enum file_close_type close_type)
 819 {
 820         struct smbd_server_connection *sconn = fsp->conn->sconn;
 821         struct smbd_smb2_request *smb2req, *nextreq;
 822
 823         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 824                 struct smbd_smb2_lock_state *state = NULL;
 825                 files_struct *fsp_curr = NULL;
 826                 struct blocking_lock_record *blr = NULL;
 827                 const uint8_t *inhdr;
 828
 829                 nextreq = smb2req->next;
 830
 831                 if (smb2req->subreq == NULL) {
 832                         /* This message has been processed. */
 833                         continue;
 834                 }
 835                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 836                         /* This message has been processed. */
 837                         continue;
 838                 }
 839
 840                 inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 841                 if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 842                         /* Not a lock call. */
 843                         continue;
 844                 }
 845
 846                 state = tevent_req_data(smb2req->subreq,
 847                                 struct smbd_smb2_lock_state);
 848                 if (!state) {
 849                         /* Strange - is this even possible ? */
 850                         continue;
 851                 }
 852
 853                 fsp_curr = smb2req->compat_chain_fsp;
 854                 if (fsp_curr == NULL) {
 855                         /* Strange - is this even possible ? */
 856                         continue;
 857                 }
 858
 859                 if (fsp_curr != fsp) {
 860                         /* It's not our fid */
 861                         continue;
 862                 }
 863
 864                 blr = state->blr;
 865
 866                 /* Remove the entries from the lock db. */
 867                 brl_lock_cancel(br_lck,
 868                                 blr->smblctx,
 869                                 messaging_server_id(sconn->msg_ctx),
 870                                 blr->offset,
 871                                 blr->count,
 872                                 blr->lock_flav,
 873                                 blr);
 874
 875                 /* Finally end the request. */
 876                 if (close_type == SHUTDOWN_CLOSE) {
 877                         tevent_req_done(smb2req->subreq);
 878                 } else {
 879                         tevent_req_nterror(smb2req->subreq,
 880                                 NT_STATUS_RANGE_NOT_LOCKED);
 881                 }
 882         }
 883 }