2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998 - 2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* Oplock ipc UDP socket. */
25 static int oplock_sock = -1;
26 uint16 global_oplock_port = 0;
28 /* Current number of oplocks we have outstanding. */
29 static int32 exclusive_oplocks_open = 0;
30 static int32 level_II_oplocks_open = 0;
31 BOOL global_client_failed_oplock_break = False;
32 BOOL global_oplock_break = False;
34 extern int smb_read_error;
36 static struct kernel_oplocks *koplocks;
38 static BOOL oplock_break(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id, BOOL local);
40 /****************************************************************************
41 Get the number of current exclusive oplocks.
42 ****************************************************************************/
44 int32 get_number_of_exclusive_open_oplocks(void)
46 return exclusive_oplocks_open;
49 /****************************************************************************
50 Return True if an oplock message is pending.
51 ****************************************************************************/
53 BOOL oplock_message_waiting(fd_set *fds)
55 if (koplocks && koplocks->msg_waiting(fds))
58 if (FD_ISSET(oplock_sock, fds))
64 /****************************************************************************
65 Read an oplock break message from either the oplock UDP fd or the
66 kernel (if kernel oplocks are supported).
68 If timeout is zero then *fds contains the file descriptors that
69 are ready to be read and acted upon. If timeout is non-zero then
70 *fds contains the file descriptors to be selected on for read.
71 The timeout is in milliseconds
73 ****************************************************************************/
75 BOOL receive_local_message( char *buffer, int buffer_len, int timeout)
77 struct sockaddr_in from;
78 socklen_t fromlen = sizeof(from);
87 * We need to check for kernel oplocks before going into the select
88 * here, as the EINTR generated by the linux kernel oplock may have
89 * already been eaten. JRA.
92 if (koplocks && koplocks->msg_waiting(&fds)) {
93 return koplocks->receive_message(&fds, buffer, buffer_len);
96 while (timeout > 0 && selrtn == -1) {
98 int maxfd = oplock_sock;
99 time_t starttime = time(NULL);
102 maxfd = setup_oplock_select_set(&fds);
104 to.tv_sec = timeout / 1000;
105 to.tv_usec = (timeout % 1000) * 1000;
107 DEBUG(5,("receive_local_message: doing select with timeout of %d ms\n", timeout));
109 selrtn = sys_select(maxfd+1,&fds,NULL,NULL,&to);
111 if (selrtn == -1 && errno == EINTR) {
113 /* could be a kernel oplock interrupt */
114 if (koplocks && koplocks->msg_waiting(&fds)) {
115 return koplocks->receive_message(&fds, buffer, buffer_len);
119 * Linux 2.0.x seems to have a bug in that
120 * it can return -1, EINTR with a timeout of zero.
121 * Make sure we bail out here with a read timeout
122 * if we got EINTR on a timeout of 1 or less.
126 smb_read_error = READ_TIMEOUT;
130 /* Not a kernel interrupt - could be a SIGUSR1 message. We must restart. */
131 /* We need to decrement the timeout here. */
132 timeout -= ((time(NULL) - starttime)*1000);
136 DEBUG(5,("receive_local_message: EINTR : new timeout %d ms\n", timeout));
142 /* something is wrong. Maybe the socket is dead? */
143 smb_read_error = READ_ERROR;
147 /* Did we timeout ? */
149 smb_read_error = READ_TIMEOUT;
154 if (koplocks && koplocks->msg_waiting(&fds)) {
155 return koplocks->receive_message(&fds, buffer, buffer_len);
158 if (!FD_ISSET(oplock_sock, &fds))
162 * From here down we deal with the smbd <--> smbd
163 * oplock break protocol only.
167 * Read a loopback udp message.
169 msg_len = sys_recvfrom(oplock_sock, &buffer[OPBRK_CMD_HEADER_LEN],
170 buffer_len - OPBRK_CMD_HEADER_LEN, 0, (struct sockaddr *)&from, &fromlen);
173 DEBUG(0,("receive_local_message. Error in recvfrom. (%s).\n",strerror(errno)));
177 /* Validate message length. */
178 if(msg_len > (buffer_len - OPBRK_CMD_HEADER_LEN)) {
179 DEBUG(0,("receive_local_message: invalid msg_len (%d) max can be %d\n", msg_len,
180 buffer_len - OPBRK_CMD_HEADER_LEN));
184 /* Validate message from address (must be localhost). */
185 if(from.sin_addr.s_addr != htonl(INADDR_LOOPBACK)) {
186 DEBUG(0,("receive_local_message: invalid 'from' address \
187 (was %lx should be 127.0.0.1)\n", (long)from.sin_addr.s_addr));
191 /* Setup the message header */
192 SIVAL(buffer,OPBRK_CMD_LEN_OFFSET,msg_len);
193 SSVAL(buffer,OPBRK_CMD_PORT_OFFSET,ntohs(from.sin_port));
198 /****************************************************************************
199 Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
200 disabled (just sets flags). Returns True if oplock set.
201 ****************************************************************************/
203 BOOL set_file_oplock(files_struct *fsp, int oplock_type)
205 if (koplocks && !koplocks->set_oplock(fsp, oplock_type))
208 fsp->oplock_type = oplock_type;
209 fsp->sent_oplock_break = NO_BREAK_SENT;
210 if (oplock_type == LEVEL_II_OPLOCK)
211 level_II_oplocks_open++;
213 exclusive_oplocks_open++;
215 DEBUG(5,("set_file_oplock: granted oplock on file %s, dev = %x, inode = %.0f, file_id = %lu, \
216 tv_sec = %x, tv_usec = %x\n",
217 fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id,
218 (int)fsp->open_time.tv_sec, (int)fsp->open_time.tv_usec ));
223 /****************************************************************************
224 Attempt to release an oplock on a file. Decrements oplock count.
225 ****************************************************************************/
227 void release_file_oplock(files_struct *fsp)
229 if ((fsp->oplock_type != NO_OPLOCK) && koplocks)
230 koplocks->release_oplock(fsp);
232 if (fsp->oplock_type == LEVEL_II_OPLOCK)
233 level_II_oplocks_open--;
234 else if (fsp->oplock_type)
235 exclusive_oplocks_open--;
237 fsp->oplock_type = NO_OPLOCK;
238 fsp->sent_oplock_break = NO_BREAK_SENT;
240 flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
243 /****************************************************************************
244 Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
245 ****************************************************************************/
247 static void downgrade_file_oplock(files_struct *fsp)
250 koplocks->release_oplock(fsp);
251 fsp->oplock_type = LEVEL_II_OPLOCK;
252 exclusive_oplocks_open--;
253 level_II_oplocks_open++;
254 fsp->sent_oplock_break = NO_BREAK_SENT;
257 /****************************************************************************
258 Remove a file oplock. Copes with level II and exclusive.
259 Locks then unlocks the share mode lock. Client can decide to go directly
260 to none even if a "break-to-level II" was sent.
261 ****************************************************************************/
263 BOOL remove_oplock(files_struct *fsp, BOOL break_to_none)
265 SMB_DEV_T dev = fsp->dev;
266 SMB_INO_T inode = fsp->inode;
269 /* Remove the oplock flag from the sharemode. */
270 if (lock_share_entry_fsp(fsp) == False) {
271 DEBUG(0,("remove_oplock: failed to lock share entry for file %s\n",
276 if (fsp->sent_oplock_break == EXCLUSIVE_BREAK_SENT || break_to_none) {
278 * Deal with a reply when a break-to-none was sent.
281 if(remove_share_oplock(fsp)==False) {
282 DEBUG(0,("remove_oplock: failed to remove share oplock for file %s fnum %d, \
283 dev = %x, inode = %.0f\n", fsp->fsp_name, fsp->fnum, (unsigned int)dev, (double)inode));
287 release_file_oplock(fsp);
290 * Deal with a reply when a break-to-level II was sent.
292 if(downgrade_share_oplock(fsp)==False) {
293 DEBUG(0,("remove_oplock: failed to downgrade share oplock for file %s fnum %d, \
294 dev = %x, inode = %.0f\n", fsp->fsp_name, fsp->fnum, (unsigned int)dev, (double)inode));
298 downgrade_file_oplock(fsp);
301 unlock_share_entry_fsp(fsp);
305 /****************************************************************************
306 Setup the listening set of file descriptors for an oplock break
307 message either from the UDP socket or from the kernel. Returns the maximum
309 ****************************************************************************/
311 int setup_oplock_select_set( fd_set *fds)
313 int maxfd = oplock_sock;
315 if(oplock_sock == -1)
318 FD_SET(oplock_sock,fds);
320 if (koplocks && koplocks->notification_fd != -1) {
321 FD_SET(koplocks->notification_fd, fds);
322 maxfd = MAX(maxfd, koplocks->notification_fd);
328 /****************************************************************************
329 Process an oplock break message - whether it came from the UDP socket
331 ****************************************************************************/
333 BOOL process_local_message(char *buffer, int buf_size)
341 unsigned long file_id;
342 uint16 break_cmd_type;
344 msg_len = IVAL(buffer,OPBRK_CMD_LEN_OFFSET);
345 from_port = SVAL(buffer,OPBRK_CMD_PORT_OFFSET);
347 msg_start = &buffer[OPBRK_CMD_HEADER_LEN];
349 DEBUG(5,("process_local_message: Got a message of length %d from port (%d)\n",
350 msg_len, from_port));
353 * Pull the info out of the requesting packet.
356 break_cmd_type = SVAL(msg_start,OPBRK_MESSAGE_CMD_OFFSET);
358 switch(break_cmd_type) {
359 case KERNEL_OPLOCK_BREAK_CMD:
361 DEBUG(0,("unexpected kernel oplock break!\n"));
364 if (!koplocks->parse_message(msg_start, msg_len, &inode, &dev, &file_id)) {
365 DEBUG(0,("kernel oplock break parse failure!\n"));
369 case OPLOCK_BREAK_CMD:
370 case LEVEL_II_OPLOCK_BREAK_CMD:
371 case ASYNC_LEVEL_II_OPLOCK_BREAK_CMD:
373 /* Ensure that the msg length is correct. */
374 if(msg_len != OPLOCK_BREAK_MSG_LEN) {
375 DEBUG(0,("process_local_message: incorrect length for OPLOCK_BREAK_CMD (was %d, should be %d).\n",
376 (int)msg_len, (int)OPLOCK_BREAK_MSG_LEN));
380 memcpy((char *)&remotepid, msg_start+OPLOCK_BREAK_PID_OFFSET,sizeof(remotepid));
381 memcpy((char *)&inode, msg_start+OPLOCK_BREAK_INODE_OFFSET,sizeof(inode));
382 memcpy((char *)&dev, msg_start+OPLOCK_BREAK_DEV_OFFSET,sizeof(dev));
383 memcpy((char *)&file_id, msg_start+OPLOCK_BREAK_FILEID_OFFSET,sizeof(file_id));
385 DEBUG(5,("process_local_message: (%s) oplock break request from \
386 pid %d, port %d, dev = %x, inode = %.0f, file_id = %lu\n",
387 (break_cmd_type == OPLOCK_BREAK_CMD) ? "exclusive" : "level II",
388 (int)remotepid, from_port, (unsigned int)dev, (double)inode, file_id));
391 case RETRY_DEFERRED_OPEN_CMD:
393 /* Request to retry and open that would return SHARING_VIOLATION. */
394 if (msg_len != DEFERRED_OPEN_MSG_LEN) {
395 DEBUG(0,("process_local_message: incorrect length for RETRY_DEFERRED_OPEN_CMD (was %d, should be %d).\n",
396 (int)msg_len, (int)DEFERRED_OPEN_MSG_LEN));
402 memcpy((char *)&remotepid, msg_start+DEFERRED_OPEN_PID_OFFSET,sizeof(remotepid));
403 memcpy((char *)&inode, msg_start+DEFERRED_OPEN_INODE_OFFSET,sizeof(inode));
404 memcpy((char *)&dev, msg_start+DEFERRED_OPEN_DEV_OFFSET,sizeof(dev));
405 memcpy((char *)&mid, msg_start+DEFERRED_OPEN_MID_OFFSET,sizeof(mid));
407 DEBUG(5,("process_local_message: RETRY_DEFERRED_OPEN from \
408 pid %d, port %d, dev = %x, inode = %.0f, mid = %u\n",
409 (int)remotepid, from_port, (unsigned int)dev, (double)inode, (unsigned int)mid));
411 schedule_sharing_violation_open_smb_message(mid);
416 * Keep this as a debug case - eventually we can remove it.
419 DEBUG(0,("process_local_message: Received unsolicited break \
420 reply - dumping info.\n"));
422 if(msg_len != OPLOCK_BREAK_MSG_LEN) {
423 DEBUG(0,("process_local_message: ubr: incorrect length for reply \
424 (was %d, should be %d).\n", (int)msg_len, (int)OPLOCK_BREAK_MSG_LEN));
428 memcpy((char *)&inode, msg_start+OPLOCK_BREAK_INODE_OFFSET,sizeof(inode));
429 memcpy((char *)&remotepid, msg_start+OPLOCK_BREAK_PID_OFFSET,sizeof(remotepid));
430 memcpy((char *)&dev, msg_start+OPLOCK_BREAK_DEV_OFFSET,sizeof(dev));
431 memcpy((char *)&file_id, msg_start+OPLOCK_BREAK_FILEID_OFFSET,sizeof(file_id));
433 DEBUG(0,("process_local_message: unsolicited oplock break reply from \
434 pid %d, port %d, dev = %x, inode = %.0f, file_id = %lu\n",
435 (int)remotepid, from_port, (unsigned int)dev, (double)inode, file_id));
440 DEBUG(0,("process_local_message: unknown UDP message command code (%x) - ignoring.\n",
441 (unsigned int)SVAL(msg_start,0)));
446 * Now actually process the break request.
449 if((exclusive_oplocks_open + level_II_oplocks_open) != 0) {
450 if (oplock_break(dev, inode, file_id, False) == False) {
451 DEBUG(0,("process_local_message: oplock break failed.\n"));
456 * If we have no record of any currently open oplocks,
457 * it's not an error, as a close command may have
458 * just been issued on the file that was oplocked.
459 * Just log a message and return success in this case.
461 DEBUG(3,("process_local_message: oplock break requested with no outstanding \
462 oplocks. Returning success.\n"));
466 * Do the appropriate reply - none in the kernel or async level II case.
469 if(break_cmd_type == OPLOCK_BREAK_CMD || break_cmd_type == LEVEL_II_OPLOCK_BREAK_CMD) {
470 struct sockaddr_in toaddr;
472 /* Send the message back after OR'ing in the 'REPLY' bit. */
473 SSVAL(msg_start,OPBRK_MESSAGE_CMD_OFFSET,break_cmd_type | CMD_REPLY);
475 memset((char *)&toaddr,'\0',sizeof(toaddr));
476 toaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
477 toaddr.sin_port = htons(from_port);
478 toaddr.sin_family = AF_INET;
480 if(sys_sendto( oplock_sock, msg_start, OPLOCK_BREAK_MSG_LEN, 0,
481 (struct sockaddr *)&toaddr, sizeof(toaddr)) < 0) {
482 DEBUG(0,("process_local_message: sendto process %d failed. Errno was %s\n",
483 (int)remotepid, strerror(errno)));
487 DEBUG(5,("process_local_message: oplock break reply sent to \
488 pid %d, port %d, for file dev = %x, inode = %.0f, file_id = %lu\n",
489 (int)remotepid, from_port, (unsigned int)dev, (double)inode, file_id));
495 /****************************************************************************
496 Set up an oplock break message.
497 ****************************************************************************/
499 static void prepare_break_message(char *outbuf, files_struct *fsp, BOOL level2)
501 memset(outbuf,'\0',smb_size);
502 set_message(outbuf,8,0,True);
504 SCVAL(outbuf,smb_com,SMBlockingX);
505 SSVAL(outbuf,smb_tid,fsp->conn->cnum);
506 SSVAL(outbuf,smb_pid,0xFFFF);
507 SSVAL(outbuf,smb_uid,0);
508 SSVAL(outbuf,smb_mid,0xFFFF);
509 SCVAL(outbuf,smb_vwv0,0xFF);
510 SSVAL(outbuf,smb_vwv2,fsp->fnum);
511 SCVAL(outbuf,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
512 SCVAL(outbuf,smb_vwv3+1,level2 ? OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
515 /****************************************************************************
516 Function to do the waiting before sending a local break.
517 ****************************************************************************/
519 static void wait_before_sending_break(BOOL local_request)
521 extern struct timeval smb_last_time;
524 struct timeval cur_tv;
525 long wait_left = (long)lp_oplock_break_wait_time();
530 GetTimeOfDay(&cur_tv);
532 wait_left -= ((cur_tv.tv_sec - smb_last_time.tv_sec)*1000) +
533 ((cur_tv.tv_usec - smb_last_time.tv_usec)/1000);
536 wait_left = MIN(wait_left, 1000);
537 sys_usleep(wait_left * 1000);
542 /****************************************************************************
543 Ensure that we have a valid oplock.
544 ****************************************************************************/
546 static files_struct *initial_break_processing(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
548 files_struct *fsp = NULL;
550 if( DEBUGLVL( 3 ) ) {
551 dbgtext( "initial_break_processing: called for dev = %x, inode = %.0f file_id = %lu\n",
552 (unsigned int)dev, (double)inode, file_id);
553 dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
554 exclusive_oplocks_open, level_II_oplocks_open );
558 * We need to search the file open table for the
559 * entry containing this dev and inode, and ensure
560 * we have an oplock on it.
563 fsp = file_find_dif(dev, inode, file_id);
566 /* The file could have been closed in the meantime - return success. */
567 if( DEBUGLVL( 3 ) ) {
568 dbgtext( "initial_break_processing: cannot find open file with " );
569 dbgtext( "dev = %x, inode = %.0f file_id = %lu", (unsigned int)dev,
570 (double)inode, file_id);
571 dbgtext( "allowing break to succeed.\n" );
576 /* Ensure we have an oplock on the file */
579 * There is a potential race condition in that an oplock could
580 * have been broken due to another udp request, and yet there are
581 * still oplock break messages being sent in the udp message
582 * queue for this file. So return true if we don't have an oplock,
583 * as we may have just freed it.
586 if(fsp->oplock_type == NO_OPLOCK) {
587 if( DEBUGLVL( 3 ) ) {
588 dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
589 dbgtext( "(dev = %x, inode = %.0f, file_id = %lu) has no oplock.\n",
590 (unsigned int)dev, (double)inode, fsp->file_id );
591 dbgtext( "Allowing break to succeed regardless.\n" );
599 /****************************************************************************
600 Process a level II oplock break directly.
601 ****************************************************************************/
603 BOOL oplock_break_level2(files_struct *fsp, BOOL local_request, int token)
605 extern uint32 global_client_caps;
607 BOOL got_lock = False;
608 SMB_DEV_T dev = fsp->dev;
609 SMB_INO_T inode = fsp->inode;
612 * We can have a level II oplock even if the client is not
613 * level II oplock aware. In this case just remove the
614 * flags and don't send the break-to-none message to
618 if (global_client_caps & CAP_LEVEL_II_OPLOCKS) {
620 * If we are sending an oplock break due to an SMB sent
621 * by our own client we ensure that we wait at leat
622 * lp_oplock_break_wait_time() milliseconds before sending
623 * the packet. Sending the packet sooner can break Win9x
624 * and has reported to cause problems on NT. JRA.
627 wait_before_sending_break(local_request);
629 /* Prepare the SMBlockingX message. */
631 prepare_break_message( outbuf, fsp, False);
632 if (!send_smb(smbd_server_fd(), outbuf))
633 exit_server("oplock_break_level2: send_smb failed.");
637 * Now we must update the shared memory structure to tell
638 * everyone else we no longer have a level II oplock on
639 * this open file. If local_request is true then token is
640 * the existing lock on the shared memory area.
643 if(!local_request && lock_share_entry_fsp(fsp) == False) {
644 DEBUG(0,("oplock_break_level2: unable to lock share entry for file %s\n", fsp->fsp_name ));
649 if(remove_share_oplock(fsp)==False) {
650 DEBUG(0,("oplock_break_level2: unable to remove level II oplock for file %s\n", fsp->fsp_name ));
653 release_file_oplock(fsp);
655 if (!local_request && got_lock)
656 unlock_share_entry_fsp(fsp);
658 if(level_II_oplocks_open < 0) {
659 DEBUG(0,("oplock_break_level2: level_II_oplocks_open < 0 (%d). PANIC ERROR\n",
660 level_II_oplocks_open));
664 if( DEBUGLVL( 3 ) ) {
665 dbgtext( "oplock_break_level2: returning success for " );
666 dbgtext( "dev = %x, inode = %.0f, file_id = %lu\n", (unsigned int)dev, (double)inode, fsp->file_id );
667 dbgtext( "Current level II oplocks_open = %d\n", level_II_oplocks_open );
673 /****************************************************************************
674 Process an oplock break directly.
675 ****************************************************************************/
677 static BOOL oplock_break(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id, BOOL local_request)
679 extern uint32 global_client_caps;
680 extern struct current_user current_user;
683 files_struct *fsp = NULL;
685 BOOL shutdown_server = False;
686 BOOL oplock_timeout = False;
688 connection_struct *saved_user_conn;
689 connection_struct *saved_fsp_conn;
692 int timeout = (OPLOCK_BREAK_TIMEOUT * 1000);
696 if((fsp = initial_break_processing(dev, inode, file_id)) == NULL)
700 * Deal with a level II oplock going break to none separately.
703 if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
704 return oplock_break_level2(fsp, local_request, -1);
706 /* Mark the oplock break as sent - we don't want to send twice! */
707 if (fsp->sent_oplock_break) {
708 if( DEBUGLVL( 0 ) ) {
709 dbgtext( "oplock_break: ERROR: oplock_break already sent for " );
710 dbgtext( "file %s ", fsp->fsp_name);
711 dbgtext( "(dev = %x, inode = %.0f, file_id = %lu)\n", (unsigned int)dev, (double)inode, fsp->file_id );
715 * We have to fail the open here as we cannot send another oplock break on
716 * this file whilst we are awaiting a response from the client - neither
717 * can we allow another open to succeed while we are waiting for the client.
722 if(global_oplock_break) {
723 DEBUG(0,("ABORT : ABORT : recursion in oplock_break !!!!!\n"));
728 * Now comes the horrid part. We must send an oplock break to the client,
729 * and then process incoming messages until we get a close or oplock release.
730 * At this point we know we need a new inbuf/outbuf buffer pair.
731 * We cannot use these staticaly as we may recurse into here due to
732 * messages crossing on the wire.
735 if((inbuf = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN))==NULL) {
736 DEBUG(0,("oplock_break: malloc fail for input buffer.\n"));
740 if((outbuf = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN))==NULL) {
741 DEBUG(0,("oplock_break: malloc fail for output buffer.\n"));
747 * If we are sending an oplock break due to an SMB sent
748 * by our own client we ensure that we wait at leat
749 * lp_oplock_break_wait_time() milliseconds before sending
750 * the packet. Sending the packet sooner can break Win9x
751 * and has reported to cause problems on NT. JRA.
754 wait_before_sending_break(local_request);
756 /* Prepare the SMBlockingX message. */
758 if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
759 !koplocks && /* NOTE: we force levelII off for kernel oplocks - this will change when it is supported */
760 lp_level2_oplocks(SNUM(fsp->conn))) {
761 using_levelII = True;
763 using_levelII = False;
766 prepare_break_message( outbuf, fsp, using_levelII);
767 /* Remember if we just sent a break to level II on this file. */
768 fsp->sent_oplock_break = using_levelII? LEVEL_II_BREAK_SENT:EXCLUSIVE_BREAK_SENT;
770 /* Save the server smb signing state. */
771 sign_state = srv_oplock_set_signing(False);
773 if (!send_smb(smbd_server_fd(), outbuf)) {
774 srv_oplock_set_signing(sign_state);
775 exit_server("oplock_break: send_smb failed.");
778 /* Restore the sign state to what it was. */
779 srv_oplock_set_signing(sign_state);
781 /* We need this in case a readraw crosses on the wire. */
782 global_oplock_break = True;
784 /* Process incoming messages. */
787 * JRA - If we don't get a break from the client in OPLOCK_BREAK_TIMEOUT
788 * seconds we should just die....
791 start_time = time(NULL);
794 * Save the information we need to re-become the
795 * user, then unbecome the user whilst we're doing this.
797 saved_user_conn = current_user.conn;
798 saved_vuid = current_user.vuid;
799 saved_fsp_conn = fsp->conn;
800 change_to_root_user();
801 vfs_GetWd(saved_fsp_conn,saved_dir);
802 /* Save the chain fnum. */
806 * From Charles Hoch <hoch@exemplary.com>. If the break processing
807 * code closes the file (as it often does), then the fsp pointer here
808 * points to free()'d memory. We *must* revalidate fsp each time
812 pstrcpy(file_name, fsp->fsp_name);
814 while((fsp = initial_break_processing(dev, inode, file_id)) &&
815 OPEN_FSP(fsp) && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
816 if(receive_smb(smbd_server_fd(),inbuf, timeout) == False) {
818 * Die if we got an error.
821 if (smb_read_error == READ_EOF) {
822 DEBUG( 0, ( "oplock_break: end of file from client\n" ) );
823 shutdown_server = True;
824 } else if (smb_read_error == READ_ERROR) {
825 DEBUG( 0, ("oplock_break: receive_smb error (%s)\n", strerror(errno)) );
826 shutdown_server = True;
827 } else if (smb_read_error == READ_BAD_SIG) {
828 DEBUG( 0, ("oplock_break: bad signature from client\n" ));
829 shutdown_server = True;
830 } else if (smb_read_error == READ_TIMEOUT) {
831 DEBUG( 0, ( "oplock_break: receive_smb timed out after %d seconds.\n", OPLOCK_BREAK_TIMEOUT ) );
832 oplock_timeout = True;
835 DEBUGADD( 0, ( "oplock_break failed for file %s ", file_name ) );
836 DEBUGADD( 0, ( "(dev = %x, inode = %.0f, file_id = %lu).\n",
837 (unsigned int)dev, (double)inode, file_id));
843 * There are certain SMB requests that we shouldn't allow
844 * to recurse. opens, renames and deletes are the obvious
845 * ones. This is handled in the switch_message() function.
846 * If global_oplock_break is set they will push the packet onto
847 * the pending smb queue and return -1 (no reply).
851 process_smb(inbuf, outbuf);
854 * Die if we go over the time limit.
857 if((time(NULL) - start_time) > OPLOCK_BREAK_TIMEOUT) {
858 if( DEBUGLVL( 0 ) ) {
859 dbgtext( "oplock_break: no break received from client " );
860 dbgtext( "within %d seconds.\n", OPLOCK_BREAK_TIMEOUT );
861 dbgtext( "oplock_break failed for file %s ", fsp->fsp_name );
862 dbgtext( "(dev = %x, inode = %.0f, file_id = %lu).\n",
863 (unsigned int)dev, (double)inode, file_id );
865 oplock_timeout = True;
871 * Go back to being the user who requested the oplock
874 if((saved_user_conn != NULL) && (saved_vuid != UID_FIELD_INVALID) && !change_to_user(saved_user_conn, saved_vuid)) {
875 DEBUG( 0, ( "oplock_break: unable to re-become user!" ) );
876 DEBUGADD( 0, ( "Shutting down server\n" ) );
878 exit_server("unable to re-become user");
881 /* Including the directory. */
882 vfs_ChDir(saved_fsp_conn,saved_dir);
884 /* Restore the chain fnum. */
885 file_chain_restore();
887 /* Free the buffers we've been using to recurse. */
891 /* We need this in case a readraw crossed on the wire. */
892 if(global_oplock_break)
893 global_oplock_break = False;
896 * If the client timed out then clear the oplock (or go to level II)
897 * and continue. This seems to be what NT does and is better than dropping
901 if(oplock_timeout && (fsp = initial_break_processing(dev, inode, file_id)) &&
902 OPEN_FSP(fsp) && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
903 DEBUG(0,("oplock_break: client failure in oplock break in file %s\n", fsp->fsp_name));
904 remove_oplock(fsp,True);
905 #if FASCIST_OPLOCK_BACKOFF
906 global_client_failed_oplock_break = True; /* Never grant this client an oplock again. */
911 * If the client had an error we must die.
914 if(shutdown_server) {
915 DEBUG( 0, ( "oplock_break: client failure in break - " ) );
916 DEBUGADD( 0, ( "shutting down this smbd.\n" ) );
918 exit_server("oplock break failure");
921 /* Santity check - remove this later. JRA */
922 if(exclusive_oplocks_open < 0) {
923 DEBUG(0,("oplock_break: exclusive_oplocks_open < 0 (%d). PANIC ERROR\n", exclusive_oplocks_open));
927 if( DEBUGLVL( 3 ) ) {
928 dbgtext( "oplock_break: returning success for " );
929 dbgtext( "dev = %x, inode = %.0f, file_id = %lu\n", (unsigned int)dev, (double)inode, file_id );
930 dbgtext( "Current exclusive_oplocks_open = %d\n", exclusive_oplocks_open );
936 /****************************************************************************
937 Send an oplock break message to another smbd process. If the oplock is held
938 by the local smbd then call the oplock break function directly.
939 ****************************************************************************/
941 BOOL request_oplock_break(share_mode_entry *share_entry, BOOL async)
943 char op_break_msg[OPLOCK_BREAK_MSG_LEN];
944 struct sockaddr_in addr_out;
945 pid_t pid = sys_getpid();
948 SMB_DEV_T dev = share_entry->dev;
949 SMB_INO_T inode = share_entry->inode;
950 unsigned long file_id = share_entry->share_file_id;
951 uint16 break_cmd_type;
953 if(pid == share_entry->pid) {
954 /* We are breaking our own oplock, make sure it's us. */
955 if(share_entry->op_port != global_oplock_port) {
956 DEBUG(0,("request_oplock_break: corrupt share mode entry - pid = %d, port = %d \
957 should be %d\n", (int)pid, share_entry->op_port, global_oplock_port));
961 DEBUG(5,("request_oplock_break: breaking our own oplock\n"));
963 #if 1 /* JRA PARANOIA TEST.... */
965 files_struct *fsp = file_find_dif(dev, inode, file_id);
967 DEBUG(0,("request_oplock_break: PANIC : breaking our own oplock requested for \
968 dev = %x, inode = %.0f, file_id = %lu and no fsp found !\n",
969 (unsigned int)dev, (double)inode, file_id ));
970 smb_panic("request_oplock_break: no fsp found for our own oplock\n");
973 #endif /* END JRA PARANOIA TEST... */
975 /* Call oplock break direct. */
976 return oplock_break(dev, inode, file_id, True);
979 /* We need to send a OPLOCK_BREAK_CMD message to the port in the share mode entry. */
981 if (LEVEL_II_OPLOCK_TYPE(share_entry->op_type)) {
982 break_cmd_type = async ? ASYNC_LEVEL_II_OPLOCK_BREAK_CMD : LEVEL_II_OPLOCK_BREAK_CMD;
984 break_cmd_type = OPLOCK_BREAK_CMD;
987 SSVAL(op_break_msg,OPBRK_MESSAGE_CMD_OFFSET,break_cmd_type);
988 memcpy(op_break_msg+OPLOCK_BREAK_PID_OFFSET,(char *)&pid,sizeof(pid));
989 memcpy(op_break_msg+OPLOCK_BREAK_DEV_OFFSET,(char *)&dev,sizeof(dev));
990 memcpy(op_break_msg+OPLOCK_BREAK_INODE_OFFSET,(char *)&inode,sizeof(inode));
991 memcpy(op_break_msg+OPLOCK_BREAK_FILEID_OFFSET,(char *)&file_id,sizeof(file_id));
993 /* Set the address and port. */
994 memset((char *)&addr_out,'\0',sizeof(addr_out));
995 addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
996 addr_out.sin_port = htons( share_entry->op_port );
997 addr_out.sin_family = AF_INET;
999 if( DEBUGLVL( 3 ) ) {
1000 dbgtext( "request_oplock_break: sending a %s oplock break message to ", async ? "asynchronous" : "synchronous" );
1001 dbgtext( "pid %d on port %d ", (int)share_entry->pid, share_entry->op_port );
1002 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1003 (unsigned int)dev, (double)inode, file_id );
1006 if(sys_sendto(oplock_sock,op_break_msg,OPLOCK_BREAK_MSG_LEN,0,
1007 (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0) {
1008 if( DEBUGLVL( 0 ) ) {
1009 dbgtext( "request_oplock_break: failed when sending a oplock " );
1010 dbgtext( "break message to pid %d ", (int)share_entry->pid );
1011 dbgtext( "on port %d ", share_entry->op_port );
1012 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1013 (unsigned int)dev, (double)inode, file_id );
1014 dbgtext( "Error was %s\n", strerror(errno) );
1020 * If we just sent a message to a level II oplock share entry in async mode then
1021 * we are done and may return.
1024 if (LEVEL_II_OPLOCK_TYPE(share_entry->op_type) && async) {
1025 DEBUG(3,("request_oplock_break: sent async break message to level II entry.\n"));
1030 * Now we must await the oplock broken message coming back
1031 * from the target smbd process. Timeout if it fails to
1032 * return in (OPLOCK_BREAK_TIMEOUT + OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR) seconds.
1033 * While we get messages that aren't ours, loop.
1036 start_time = time(NULL);
1037 time_left = OPLOCK_BREAK_TIMEOUT+OPLOCK_BREAK_TIMEOUT_FUDGEFACTOR;
1039 while(time_left >= 0) {
1040 char op_break_reply[OPBRK_CMD_HEADER_LEN+OPLOCK_BREAK_MSG_LEN];
1041 uint16 reply_from_port;
1042 char *reply_msg_start;
1044 if(receive_local_message(op_break_reply, sizeof(op_break_reply),
1045 time_left ? time_left * 1000 : 1) == False) {
1046 if(smb_read_error == READ_TIMEOUT) {
1047 if( DEBUGLVL( 0 ) ) {
1048 dbgtext( "request_oplock_break: no response received to oplock " );
1049 dbgtext( "break request to pid %d ", (int)share_entry->pid );
1050 dbgtext( "on port %d ", share_entry->op_port );
1051 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1052 (unsigned int)dev, (double)inode, file_id );
1056 * This is a hack to make handling of failing clients more robust.
1057 * If a oplock break response message is not received in the timeout
1058 * period we may assume that the smbd servicing that client holding
1059 * the oplock has died and the client changes were lost anyway, so
1060 * we should continue to try and open the file.
1064 if( DEBUGLVL( 0 ) ) {
1065 dbgtext( "request_oplock_break: error in response received " );
1066 dbgtext( "to oplock break request to pid %d ", (int)share_entry->pid );
1067 dbgtext( "on port %d ", share_entry->op_port );
1068 dbgtext( "for dev = %x, inode = %.0f, file_id = %lu\n",
1069 (unsigned int)dev, (double)inode, file_id );
1070 dbgtext( "Error was (%s).\n", strerror(errno) );
1076 reply_from_port = SVAL(op_break_reply,OPBRK_CMD_PORT_OFFSET);
1077 reply_msg_start = &op_break_reply[OPBRK_CMD_HEADER_LEN];
1080 * Test to see if this is the reply we are awaiting (ie. the one we sent with the CMD_REPLY flag OR'ed in).
1082 if((SVAL(reply_msg_start,OPBRK_MESSAGE_CMD_OFFSET) & CMD_REPLY) &&
1083 ((SVAL(reply_msg_start,OPBRK_MESSAGE_CMD_OFFSET) & ~CMD_REPLY) == break_cmd_type) &&
1084 (reply_from_port == share_entry->op_port) &&
1085 (memcmp(&reply_msg_start[OPLOCK_BREAK_PID_OFFSET], &op_break_msg[OPLOCK_BREAK_PID_OFFSET],
1086 OPLOCK_BREAK_MSG_LEN - OPLOCK_BREAK_PID_OFFSET) == 0)) {
1089 * This is the reply we've been waiting for.
1094 * This is another message - a break request.
1095 * Note that both kernel oplock break requests
1096 * and UDP inter-smbd oplock break requests will
1097 * be processed here.
1099 * Process it to prevent potential deadlock.
1100 * Note that the code in switch_message() prevents
1101 * us from recursing into here as any SMB requests
1102 * we might process that would cause another oplock
1103 * break request to be made will be queued.
1107 process_local_message(op_break_reply, sizeof(op_break_reply));
1110 time_left -= (time(NULL) - start_time);
1113 DEBUG(3,("request_oplock_break: broke oplock.\n"));
1118 /****************************************************************************
1119 Attempt to break an oplock on a file (if oplocked).
1120 Returns True if the file was closed as a result of
1121 the oplock break, False otherwise.
1122 Used as a last ditch attempt to free a space in the
1123 file table when we have run out.
1124 ****************************************************************************/
1126 BOOL attempt_close_oplocked_file(files_struct *fsp)
1128 DEBUG(5,("attempt_close_oplocked_file: checking file %s.\n", fsp->fsp_name));
1130 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && !fsp->sent_oplock_break && (fsp->fd != -1)) {
1131 /* Try and break the oplock. */
1132 if (oplock_break(fsp->dev, fsp->inode, fsp->file_id, True)) {
1133 if(file_find_fsp(fsp) == NULL) /* Did the oplock break close the file ? */
1141 /****************************************************************************
1142 This function is called on any file modification or lock request. If a file
1143 is level 2 oplocked then it must tell all other level 2 holders to break to none.
1144 ****************************************************************************/
1146 void release_level_2_oplocks_on_change(files_struct *fsp)
1148 share_mode_entry *share_list = NULL;
1149 pid_t pid = sys_getpid();
1151 int num_share_modes = 0;
1155 * If this file is level II oplocked then we need
1156 * to grab the shared memory lock and inform all
1157 * other files with a level II lock that they need
1158 * to flush their read caches. We keep the lock over
1159 * the shared memory area whilst doing this.
1162 if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
1165 if (lock_share_entry_fsp(fsp) == False) {
1166 DEBUG(0,("release_level_2_oplocks_on_change: failed to lock share mode entry for file %s.\n", fsp->fsp_name ));
1169 num_share_modes = get_share_modes(fsp->conn, fsp->dev, fsp->inode, &share_list);
1171 DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
1174 for(i = 0; i < num_share_modes; i++) {
1175 share_mode_entry *share_entry = &share_list[i];
1178 * As there could have been multiple writes waiting at the lock_share_entry
1179 * gate we may not be the first to enter. Hence the state of the op_types
1180 * in the share mode entries may be partly NO_OPLOCK and partly LEVEL_II
1181 * oplock. It will do no harm to re-send break messages to those smbd's
1182 * that are still waiting their turn to remove their LEVEL_II state, and
1183 * also no harm to ignore existing NO_OPLOCK states. JRA.
1186 DEBUG(10,("release_level_2_oplocks_on_change: share_entry[%i]->op_type == %d\n",
1187 i, share_entry->op_type ));
1189 if (share_entry->op_type == NO_OPLOCK)
1193 if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
1194 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. share mode entry %d is an exlusive oplock !\n", i ));
1195 unlock_share_entry(fsp->conn, fsp->dev, fsp->inode);
1200 * Check if this is a file we have open (including the
1201 * file we've been called to do write_file on. If so
1202 * then break it directly without releasing the lock.
1205 if (pid == share_entry->pid) {
1206 files_struct *new_fsp = file_find_dif(share_entry->dev, share_entry->inode, share_entry->share_file_id);
1208 /* Paranoia check... */
1209 if(new_fsp == NULL) {
1210 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. share mode entry %d is not a local file !\n", i ));
1211 unlock_share_entry(fsp->conn, fsp->dev, fsp->inode);
1215 DEBUG(10,("release_level_2_oplocks_on_change: breaking our own oplock.\n"));
1217 oplock_break_level2(new_fsp, True, token);
1222 * This is a remote file and so we send an asynchronous
1226 DEBUG(10,("release_level_2_oplocks_on_change: breaking remote oplock (async).\n"));
1227 request_oplock_break(share_entry, True);
1231 SAFE_FREE(share_list);
1232 unlock_share_entry_fsp(fsp);
1234 /* Paranoia check... */
1235 if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type)) {
1236 DEBUG(0,("release_level_2_oplocks_on_change: PANIC. File %s still has a level II oplock.\n", fsp->fsp_name));
1237 smb_panic("release_level_2_oplocks_on_change");
1241 /****************************************************************************
1242 Send a 'retry your open' message to a process with a deferred open entry.
1243 ****************************************************************************/
1245 BOOL send_deferred_open_retry_message(deferred_open_entry *entry)
1247 char de_msg[DEFERRED_OPEN_MSG_LEN];
1248 struct sockaddr_in addr_out;
1249 pid_t pid = sys_getpid();
1251 memset(de_msg, '\0', DEFERRED_OPEN_MSG_LEN);
1252 SSVAL(de_msg,DEFERRED_OPEN_CMD_OFFSET,RETRY_DEFERRED_OPEN_CMD);
1253 memcpy(de_msg+DEFERRED_OPEN_PID_OFFSET,(char *)&pid,sizeof(pid));
1254 memcpy(de_msg+DEFERRED_OPEN_DEV_OFFSET,(char *)&entry->dev,sizeof(entry->dev));
1255 memcpy(de_msg+DEFERRED_OPEN_INODE_OFFSET,(char *)&entry->inode,sizeof(entry->inode));
1256 memcpy(de_msg+DEFERRED_OPEN_MID_OFFSET,(char *)&entry->mid,sizeof(entry->mid));
1258 /* Set the address and port. */
1259 memset((char *)&addr_out,'\0',sizeof(addr_out));
1260 addr_out.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1261 addr_out.sin_port = htons( entry->port );
1262 addr_out.sin_family = AF_INET;
1264 if( DEBUGLVL( 3 ) ) {
1265 dbgtext( "send_deferred_open_retry_message: sending a message to ");
1266 dbgtext( "pid %d on port %d ", (int)entry->pid, entry->port );
1267 dbgtext( "for dev = %x, inode = %.0f, mid = %u\n",
1268 (unsigned int)entry->dev, (double)entry->inode, (unsigned int)entry->mid );
1271 if(sys_sendto(oplock_sock,de_msg,DEFERRED_OPEN_MSG_LEN,0,
1272 (struct sockaddr *)&addr_out,sizeof(addr_out)) < 0) {
1273 if( DEBUGLVL( 0 ) ) {
1274 dbgtext( "send_deferred_open_retry_message: failed sending a message to ");
1275 dbgtext( "pid %d on port %d ", (int)entry->pid, entry->port );
1276 dbgtext( "for dev = %x, inode = %.0f, mid = %u\n",
1277 (unsigned int)entry->dev, (double)entry->inode, (unsigned int)entry->mid );
1278 dbgtext( "Error was %s\n", strerror(errno) );
1285 /****************************************************************************
1286 Setup oplocks for this process.
1287 ****************************************************************************/
1289 BOOL init_oplocks(void)
1291 struct sockaddr_in sock_name;
1292 socklen_t len = sizeof(sock_name);
1294 DEBUG(3,("open_oplock_ipc: opening loopback UDP socket.\n"));
1296 /* Open a lookback UDP socket on a random port. */
1297 oplock_sock = open_socket_in(SOCK_DGRAM, 0, 0, htonl(INADDR_LOOPBACK),False);
1298 if (oplock_sock == -1) {
1299 DEBUG(0,("open_oplock_ipc: Failed to get local UDP socket for \
1300 address %lx. Error was %s\n", (long)htonl(INADDR_LOOPBACK), strerror(errno)));
1301 global_oplock_port = 0;
1305 /* Find out the transient UDP port we have been allocated. */
1306 if(getsockname(oplock_sock, (struct sockaddr *)&sock_name, &len)<0) {
1307 DEBUG(0,("open_oplock_ipc: Failed to get local UDP port. Error was %s\n",
1311 global_oplock_port = 0;
1314 global_oplock_port = ntohs(sock_name.sin_port);
1316 if (lp_kernel_oplocks()) {
1317 #if HAVE_KERNEL_OPLOCKS_IRIX
1318 koplocks = irix_init_kernel_oplocks();
1319 #elif HAVE_KERNEL_OPLOCKS_LINUX
1320 koplocks = linux_init_kernel_oplocks();
1324 DEBUG(3,("open_oplock ipc: pid = %d, global_oplock_port = %u\n",
1325 (int)sys_getpid(), global_oplock_port));