1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
|
/*
Unix SMB/CIFS implementation.
oplock processing
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998 - 2001
Copyright (C) Volker Lendecke 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define DBGC_CLASS DBGC_LOCKING
#include "includes.h"
/* Current number of oplocks we have outstanding. */
static int32 exclusive_oplocks_open = 0;
static int32 level_II_oplocks_open = 0;
bool global_client_failed_oplock_break = False;
extern uint32 global_client_caps;
static struct kernel_oplocks *koplocks;
/****************************************************************************
Get the number of current exclusive oplocks.
****************************************************************************/
int32 get_number_of_exclusive_open_oplocks(void)
{
return exclusive_oplocks_open;
}
/****************************************************************************
Return True if an oplock message is pending.
****************************************************************************/
bool oplock_message_waiting(fd_set *fds)
{
if (koplocks && koplocks->msg_waiting(fds)) {
return True;
}
return False;
}
/****************************************************************************
Find out if there are any kernel oplock messages waiting and process them
if so. pfds is the fd_set from the main select loop (which contains any
kernel oplock fd if that's what the system uses (IRIX). If may be NULL if
we're calling this in a shutting down state.
****************************************************************************/
void process_kernel_oplocks(struct messaging_context *msg_ctx, fd_set *pfds)
{
/*
* We need to check for kernel oplocks before going into the select
* here, as the EINTR generated by the linux kernel oplock may have
* already been eaten. JRA.
*/
if (!koplocks) {
return;
}
while (koplocks->msg_waiting(pfds)) {
files_struct *fsp;
char msg[MSG_SMB_KERNEL_BREAK_SIZE];
fsp = koplocks->receive_message(pfds);
if (fsp == NULL) {
DEBUG(3, ("Kernel oplock message announced, but none "
"received\n"));
return;
}
/* Put the kernel break info into the message. */
push_file_id_16(msg, &fsp->file_id);
SIVAL(msg,16,fsp->fh->gen_id);
/* Don't need to be root here as we're only ever
sending to ourselves. */
messaging_send_buf(msg_ctx, procid_self(),
MSG_SMB_KERNEL_BREAK,
(uint8 *)&msg, MSG_SMB_KERNEL_BREAK_SIZE);
}
}
/****************************************************************************
Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
disabled (just sets flags). Returns True if oplock set.
****************************************************************************/
bool set_file_oplock(files_struct *fsp, int oplock_type)
{
if (koplocks && !koplocks->set_oplock(fsp, oplock_type)) {
return False;
}
fsp->oplock_type = oplock_type;
fsp->sent_oplock_break = NO_BREAK_SENT;
if (oplock_type == LEVEL_II_OPLOCK) {
level_II_oplocks_open++;
} else {
exclusive_oplocks_open++;
}
DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
"tv_sec = %x, tv_usec = %x\n",
fsp->fsp_name, file_id_string_tos(&fsp->file_id),
fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
(int)fsp->open_time.tv_usec ));
return True;
}
/****************************************************************************
Attempt to release an oplock on a file. Decrements oplock count.
****************************************************************************/
void release_file_oplock(files_struct *fsp)
{
if ((fsp->oplock_type != NO_OPLOCK) &&
(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
koplocks) {
koplocks->release_oplock(fsp);
}
if (fsp->oplock_type == LEVEL_II_OPLOCK) {
level_II_oplocks_open--;
} else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
exclusive_oplocks_open--;
}
SMB_ASSERT(exclusive_oplocks_open>=0);
SMB_ASSERT(level_II_oplocks_open>=0);
fsp->oplock_type = NO_OPLOCK;
fsp->sent_oplock_break = NO_BREAK_SENT;
flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
TALLOC_FREE(fsp->oplock_timeout);
}
/****************************************************************************
Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
****************************************************************************/
static void downgrade_file_oplock(files_struct *fsp)
{
if (koplocks) {
koplocks->release_oplock(fsp);
}
fsp->oplock_type = LEVEL_II_OPLOCK;
exclusive_oplocks_open--;
level_II_oplocks_open++;
fsp->sent_oplock_break = NO_BREAK_SENT;
}
/****************************************************************************
Remove a file oplock. Copes with level II and exclusive.
Locks then unlocks the share mode lock. Client can decide to go directly
to none even if a "break-to-level II" was sent.
****************************************************************************/
bool remove_oplock(files_struct *fsp)
{
bool ret;
struct share_mode_lock *lck;
/* Remove the oplock flag from the sharemode. */
lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
NULL);
if (lck == NULL) {
DEBUG(0,("remove_oplock: failed to lock share entry for "
"file %s\n", fsp->fsp_name ));
return False;
}
ret = remove_share_oplock(lck, fsp);
if (!ret) {
DEBUG(0,("remove_oplock: failed to remove share oplock for "
"file %s fnum %d, %s\n",
fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
}
release_file_oplock(fsp);
TALLOC_FREE(lck);
return ret;
}
/*
* Deal with a reply when a break-to-level II was sent.
*/
bool downgrade_oplock(files_struct *fsp)
{
bool ret;
struct share_mode_lock *lck;
lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
NULL);
if (lck == NULL) {
DEBUG(0,("downgrade_oplock: failed to lock share entry for "
"file %s\n", fsp->fsp_name ));
return False;
}
ret = downgrade_share_oplock(lck, fsp);
if (!ret) {
DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
"for file %s fnum %d, file_id %s\n",
fsp->fsp_name, fsp->fnum, file_id_string_tos(&fsp->file_id)));
}
downgrade_file_oplock(fsp);
TALLOC_FREE(lck);
return ret;
}
/****************************************************************************
Return the fd (if any) used for receiving oplock notifications.
****************************************************************************/
int oplock_notify_fd(void)
{
if (koplocks) {
return koplocks->notification_fd;
}
return -1;
}
/****************************************************************************
Set up an oplock break message.
****************************************************************************/
static char *new_break_smb_message(TALLOC_CTX *mem_ctx,
files_struct *fsp, uint8 cmd)
{
char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
if (result == NULL) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
memset(result,'\0',smb_size);
srv_set_message(result,8,0,true);
SCVAL(result,smb_com,SMBlockingX);
SSVAL(result,smb_tid,fsp->conn->cnum);
SSVAL(result,smb_pid,0xFFFF);
SSVAL(result,smb_uid,0);
SSVAL(result,smb_mid,0xFFFF);
SCVAL(result,smb_vwv0,0xFF);
SSVAL(result,smb_vwv2,fsp->fnum);
SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
SCVAL(result,smb_vwv3+1,cmd);
return result;
}
/****************************************************************************
Function to do the waiting before sending a local break.
****************************************************************************/
static void wait_before_sending_break(void)
{
long wait_time = (long)lp_oplock_break_wait_time();
if (wait_time) {
smb_msleep(wait_time);
}
}
/****************************************************************************
Ensure that we have a valid oplock.
****************************************************************************/
static files_struct *initial_break_processing(struct file_id id, unsigned long file_id)
{
files_struct *fsp = NULL;
if( DEBUGLVL( 3 ) ) {
dbgtext( "initial_break_processing: called for %s/%u\n",
file_id_string_tos(&id), (int)file_id);
dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
exclusive_oplocks_open, level_II_oplocks_open );
}
/*
* We need to search the file open table for the
* entry containing this dev and inode, and ensure
* we have an oplock on it.
*/
fsp = file_find_dif(id, file_id);
if(fsp == NULL) {
/* The file could have been closed in the meantime - return success. */
if( DEBUGLVL( 3 ) ) {
dbgtext( "initial_break_processing: cannot find open file with " );
dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
dbgtext( "allowing break to succeed.\n" );
}
return NULL;
}
/* Ensure we have an oplock on the file */
/*
* There is a potential race condition in that an oplock could
* have been broken due to another udp request, and yet there are
* still oplock break messages being sent in the udp message
* queue for this file. So return true if we don't have an oplock,
* as we may have just freed it.
*/
if(fsp->oplock_type == NO_OPLOCK) {
if( DEBUGLVL( 3 ) ) {
dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
file_id_string_tos(&id), fsp->fh->gen_id );
dbgtext( "Allowing break to succeed regardless.\n" );
}
return NULL;
}
return fsp;
}
static void oplock_timeout_handler(struct event_context *ctx,
struct timed_event *te,
const struct timeval *now,
void *private_data)
{
files_struct *fsp = (files_struct *)private_data;
/* Remove the timed event handler. */
TALLOC_FREE(fsp->oplock_timeout);
DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n", fsp->fsp_name));
global_client_failed_oplock_break = True;
remove_oplock(fsp);
reply_to_oplock_break_requests(fsp);
}
/*******************************************************************
Add a timeout handler waiting for the client reply.
*******************************************************************/
static void add_oplock_timeout_handler(files_struct *fsp)
{
if (fsp->oplock_timeout != NULL) {
DEBUG(0, ("Logic problem -- have an oplock event hanging "
"around\n"));
}
fsp->oplock_timeout =
event_add_timed(smbd_event_context(), NULL,
timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
"oplock_timeout_handler",
oplock_timeout_handler, fsp);
if (fsp->oplock_timeout == NULL) {
DEBUG(0, ("Could not add oplock timeout handler\n"));
}
}
/*******************************************************************
This handles the case of a write triggering a break to none
message on a level2 oplock.
When we get this message we may be in any of three states :
NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
the client for LEVEL2.
*******************************************************************/
static void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct share_mode_entry msg;
files_struct *fsp;
char *break_msg;
bool sign_state;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* De-linearize incoming message. */
message_to_share_mode_entry(&msg, (char *)data->data);
DEBUG(10, ("Got oplock async level 2 break message from pid %d: %s/%lu\n",
(int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id));
fsp = initial_break_processing(msg.id, msg.share_file_id);
if (fsp == NULL) {
/* We hit a race here. Break messages are sent, and before we
* get to process this message, we have closed the file.
* No need to reply as this is an async message. */
DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
return;
}
if (fsp->oplock_type == NO_OPLOCK) {
/* We already got a "break to none" message and we've handled it.
* just ignore. */
DEBUG(3, ("process_oplock_async_level2_break_message: already broken to none, ignoring.\n"));
return;
}
if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
/* Don't tell the client, just downgrade. */
DEBUG(3, ("process_oplock_async_level2_break_message: downgrading fake level 2 oplock.\n"));
remove_oplock(fsp);
return;
}
/* Ensure we're really at level2 state. */
SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
/* Now send a break to none message to our client. */
break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
if (break_msg == NULL) {
exit_server("Could not talloc break_msg\n");
}
/* Need to wait before sending a break message if we sent ourselves this message. */
if (procid_to_pid(&src) == sys_getpid()) {
wait_before_sending_break();
}
/* Save the server smb signing state. */
sign_state = srv_oplock_set_signing(False);
show_msg(break_msg);
if (!srv_send_smb(smbd_server_fd(),
break_msg,
IS_CONN_ENCRYPTED(fsp->conn))) {
exit_server_cleanly("oplock_break: srv_send_smb failed.");
}
/* Restore the sign state to what it was. */
srv_oplock_set_signing(sign_state);
TALLOC_FREE(break_msg);
/* Async level2 request, don't send a reply, just remove the oplock. */
remove_oplock(fsp);
}
/*******************************************************************
This handles the generic oplock break message from another smbd.
*******************************************************************/
static void process_oplock_break_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct share_mode_entry msg;
files_struct *fsp;
char *break_msg;
bool break_to_level2 = False;
bool sign_state;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* De-linearize incoming message. */
message_to_share_mode_entry(&msg, (char *)data->data);
DEBUG(10, ("Got oplock break message from pid %d: %s/%lu\n",
(int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id));
fsp = initial_break_processing(msg.id, msg.share_file_id);
if (fsp == NULL) {
/* a We hit race here. Break messages are sent, and before we
* get to process this message, we have closed the file. Reply
* with 'ok, oplock broken' */
DEBUG(3, ("Did not find fsp\n"));
/* We just send the same message back. */
messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
(uint8 *)data->data,
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
return;
}
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
/* Remember we have to inform the requesting PID when the
* client replies */
msg.pid = src;
ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
&fsp->pending_break_messages,
&fsp->num_pending_break_messages);
return;
}
if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
DEBUG(3, ("Already downgraded oplock on %s: %s\n",
file_id_string_tos(&fsp->file_id),
fsp->fsp_name));
/* We just send the same message back. */
messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
(uint8 *)data->data,
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
return;
}
if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
!(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
!koplocks && /* NOTE: we force levelII off for kernel oplocks -
* this will change when it is supported */
lp_level2_oplocks(SNUM(fsp->conn))) {
break_to_level2 = True;
}
break_msg = new_break_smb_message(NULL, fsp, break_to_level2 ?
OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
if (break_msg == NULL) {
exit_server("Could not talloc break_msg\n");
}
/* Need to wait before sending a break message if we sent ourselves this message. */
if (procid_to_pid(&src) == sys_getpid()) {
wait_before_sending_break();
}
/* Save the server smb signing state. */
sign_state = srv_oplock_set_signing(False);
show_msg(break_msg);
if (!srv_send_smb(smbd_server_fd(),
break_msg,
IS_CONN_ENCRYPTED(fsp->conn))) {
exit_server_cleanly("oplock_break: srv_send_smb failed.");
}
/* Restore the sign state to what it was. */
srv_oplock_set_signing(sign_state);
TALLOC_FREE(break_msg);
fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
msg.pid = src;
ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
&fsp->pending_break_messages,
&fsp->num_pending_break_messages);
add_oplock_timeout_handler(fsp);
}
/*******************************************************************
This handles the kernel oplock break message.
*******************************************************************/
static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct file_id id;
unsigned long file_id;
files_struct *fsp;
char *break_msg;
bool sign_state;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* Pull the data from the message. */
pull_file_id_16((char *)data->data, &id);
file_id = (unsigned long)IVAL(data->data, 16);
DEBUG(10, ("Got kernel oplock break message from pid %d: %s/%u\n",
(int)procid_to_pid(&src), file_id_string_tos(&id),
(unsigned int)file_id));
fsp = initial_break_processing(id, file_id);
if (fsp == NULL) {
DEBUG(3, ("Got a kernel oplock break message for a file "
"I don't know about\n"));
return;
}
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
/* This is ok, kernel oplocks come in completely async */
DEBUG(3, ("Got a kernel oplock request while waiting for a "
"break reply\n"));
return;
}
break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
if (break_msg == NULL) {
exit_server("Could not talloc break_msg\n");
}
/* Save the server smb signing state. */
sign_state = srv_oplock_set_signing(False);
show_msg(break_msg);
if (!srv_send_smb(smbd_server_fd(),
break_msg,
IS_CONN_ENCRYPTED(fsp->conn))) {
exit_server_cleanly("oplock_break: srv_send_smb failed.");
}
/* Restore the sign state to what it was. */
srv_oplock_set_signing(sign_state);
TALLOC_FREE(break_msg);
fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
add_oplock_timeout_handler(fsp);
}
void reply_to_oplock_break_requests(files_struct *fsp)
{
int i;
for (i=0; i<fsp->num_pending_break_messages; i++) {
struct share_mode_entry *e = &fsp->pending_break_messages[i];
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
share_mode_entry_to_message(msg, e);
messaging_send_buf(smbd_messaging_context(), e->pid,
MSG_SMB_BREAK_RESPONSE,
(uint8 *)msg,
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
}
SAFE_FREE(fsp->pending_break_messages);
fsp->num_pending_break_messages = 0;
if (fsp->oplock_timeout != NULL) {
/* Remove the timed event handler. */
TALLOC_FREE(fsp->oplock_timeout);
fsp->oplock_timeout = NULL;
}
return;
}
static void process_oplock_break_response(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct share_mode_entry msg;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
DEBUG(0, ("Got invalid msg len %u\n",
(unsigned int)data->length));
return;
}
/* De-linearize incoming message. */
message_to_share_mode_entry(&msg, (char *)data->data);
DEBUG(10, ("Got oplock break response from pid %d: %s/%lu mid %u\n",
(int)procid_to_pid(&src), file_id_string_tos(&msg.id), msg.share_file_id,
(unsigned int)msg.op_mid));
/* Here's the hack from open.c, store the mid in the 'port' field */
schedule_deferred_open_smb_message(msg.op_mid);
}
static void process_open_retry_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct share_mode_entry msg;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* De-linearize incoming message. */
message_to_share_mode_entry(&msg, (char *)data->data);
DEBUG(10, ("Got open retry msg from pid %d: %s mid %u\n",
(int)procid_to_pid(&src), file_id_string_tos(&msg.id),
(unsigned int)msg.op_mid));
schedule_deferred_open_smb_message(msg.op_mid);
}
/****************************************************************************
This function is called on any file modification or lock request. If a file
is level 2 oplocked then it must tell all other level 2 holders to break to
none.
****************************************************************************/
void release_level_2_oplocks_on_change(files_struct *fsp)
{
int i;
struct share_mode_lock *lck;
/*
* If this file is level II oplocked then we need
* to grab the shared memory lock and inform all
* other files with a level II lock that they need
* to flush their read caches. We keep the lock over
* the shared memory area whilst doing this.
*/
if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
return;
lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
NULL);
if (lck == NULL) {
DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
"share mode entry for file %s.\n", fsp->fsp_name ));
return;
}
DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
lck->num_share_modes ));
for(i = 0; i < lck->num_share_modes; i++) {
struct share_mode_entry *share_entry = &lck->share_modes[i];
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
if (!is_valid_share_mode_entry(share_entry)) {
continue;
}
/*
* As there could have been multiple writes waiting at the
* lock_share_entry gate we may not be the first to
* enter. Hence the state of the op_types in the share mode
* entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
* oplock. It will do no harm to re-send break messages to
* those smbd's that are still waiting their turn to remove
* their LEVEL_II state, and also no harm to ignore existing
* NO_OPLOCK states. JRA.
*/
DEBUG(10,("release_level_2_oplocks_on_change: "
"share_entry[%i]->op_type == %d\n",
i, share_entry->op_type ));
if (share_entry->op_type == NO_OPLOCK) {
continue;
}
/* Paranoia .... */
if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
"share mode entry %d is an exlusive "
"oplock !\n", i ));
TALLOC_FREE(lck);
abort();
}
share_mode_entry_to_message(msg, share_entry);
messaging_send_buf(smbd_messaging_context(), share_entry->pid,
MSG_SMB_ASYNC_LEVEL2_BREAK,
(uint8 *)msg,
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
}
/* We let the message receivers handle removing the oplock state
in the share mode lock db. */
TALLOC_FREE(lck);
}
/****************************************************************************
Linearize a share mode entry struct to an internal oplock break message.
****************************************************************************/
void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
{
SIVAL(msg,0,(uint32)e->pid.pid);
SSVAL(msg,4,e->op_mid);
SSVAL(msg,6,e->op_type);
SIVAL(msg,8,e->access_mask);
SIVAL(msg,12,e->share_access);
SIVAL(msg,16,e->private_options);
SIVAL(msg,20,(uint32)e->time.tv_sec);
SIVAL(msg,24,(uint32)e->time.tv_usec);
push_file_id_16(msg+28, &e->id);
SIVAL(msg,44,e->share_file_id);
SIVAL(msg,48,e->uid);
SSVAL(msg,52,e->flags);
#ifdef CLUSTER_SUPPORT
SIVAL(msg,54,e->pid.vnn);
#endif
}
/****************************************************************************
De-linearize an internal oplock break message to a share mode entry struct.
****************************************************************************/
void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
{
e->pid.pid = (pid_t)IVAL(msg,0);
e->op_mid = SVAL(msg,4);
e->op_type = SVAL(msg,6);
e->access_mask = IVAL(msg,8);
e->share_access = IVAL(msg,12);
e->private_options = IVAL(msg,16);
e->time.tv_sec = (time_t)IVAL(msg,20);
e->time.tv_usec = (int)IVAL(msg,24);
pull_file_id_16(msg+28, &e->id);
e->share_file_id = (unsigned long)IVAL(msg,44);
e->uid = (uint32)IVAL(msg,48);
e->flags = (uint16)SVAL(msg,52);
#ifdef CLUSTER_SUPPORT
e->pid.vnn = IVAL(msg,54);
#endif
}
/****************************************************************************
Setup oplocks for this process.
****************************************************************************/
bool init_oplocks(struct messaging_context *msg_ctx)
{
DEBUG(3,("init_oplocks: initializing messages.\n"));
messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_REQUEST,
process_oplock_break_message);
messaging_register(msg_ctx, NULL, MSG_SMB_ASYNC_LEVEL2_BREAK,
process_oplock_async_level2_break_message);
messaging_register(msg_ctx, NULL, MSG_SMB_BREAK_RESPONSE,
process_oplock_break_response);
messaging_register(msg_ctx, NULL, MSG_SMB_KERNEL_BREAK,
process_kernel_oplock_break);
messaging_register(msg_ctx, NULL, MSG_SMB_OPEN_RETRY,
process_open_retry_message);
if (lp_kernel_oplocks()) {
#if HAVE_KERNEL_OPLOCKS_IRIX
koplocks = irix_init_kernel_oplocks();
#elif HAVE_KERNEL_OPLOCKS_LINUX
koplocks = linux_init_kernel_oplocks();
#endif
}
return True;
}
|