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blocking.c

/* 
   Unix SMB/CIFS implementation.
   Blocking Locking functions
   Copyright (C) Jeremy Allison 1998
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern char *OutBuffer;

/****************************************************************************
 This is the structure to queue to implement blocking locks.
 notify. It consists of the requesting SMB and the expiry time.
*****************************************************************************/

typedef struct {
  ubi_slNode msg_next;
  int com_type;
  files_struct *fsp;
  time_t expire_time;
  int lock_num;
  SMB_BIG_UINT offset;
  SMB_BIG_UINT count;
  uint16 lock_pid;
  char *inbuf;
  int length;
} blocking_lock_record;

static ubi_slList blocking_lock_queue = { NULL, (ubi_slNodePtr)&blocking_lock_queue, 0};

/****************************************************************************
 Destructor for the above structure.
****************************************************************************/

static void free_blocking_lock_record(blocking_lock_record *blr)
{
  SAFE_FREE(blr->inbuf);
  SAFE_FREE(blr);
}

/****************************************************************************
 Get the files_struct given a particular queued SMB.
*****************************************************************************/

static files_struct *get_fsp_from_pkt(char *inbuf)
{
  switch(CVAL(inbuf,smb_com)) {
  case SMBlock:
  case SMBlockread:
    return file_fsp(inbuf,smb_vwv0);
  case SMBlockingX:
    return file_fsp(inbuf,smb_vwv2);
  default:
    DEBUG(0,("get_fsp_from_pkt: PANIC - unknown type on blocking lock queue - exiting.!\n"));
    exit_server("PANIC - unknown type on blocking lock queue");
  }
  return NULL; /* Keep compiler happy. */
}

/****************************************************************************
 Determine if this is a secondary element of a chained SMB.
  **************************************************************************/

static BOOL in_chained_smb(void)
{
  return (chain_size != 0);
}

static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len);

/****************************************************************************
 Function to push a blocking lock request onto the lock queue.
****************************************************************************/

BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout,
            int lock_num, uint16 lock_pid, SMB_BIG_UINT offset, SMB_BIG_UINT count)
{
  static BOOL set_lock_msg;
  blocking_lock_record *blr;
  NTSTATUS status;

  if(in_chained_smb() ) {
    DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
    return False;
  }

  /*
   * Now queue an entry on the blocking lock queue. We setup
   * the expiration time here.
   */

  if((blr = (blocking_lock_record *)malloc(sizeof(blocking_lock_record))) == NULL) {
    DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
    return False;
  }

  if((blr->inbuf = (char *)malloc(length)) == NULL) {
    DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
    SAFE_FREE(blr);
    return False;
  }

  blr->com_type = CVAL(inbuf,smb_com);
  blr->fsp = get_fsp_from_pkt(inbuf);
  blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
  blr->lock_num = lock_num;
  blr->lock_pid = lock_pid;
  blr->offset = offset;
  blr->count = count;
  memcpy(blr->inbuf, inbuf, length);
  blr->length = length;

  /* Add a pending lock record for this. */
  status = brl_lock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
            lock_pid, sys_getpid(), blr->fsp->conn->cnum,
            offset, count,
            PENDING_LOCK);

  if (!NT_STATUS_IS_OK(status)) {
      DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
      free_blocking_lock_record(blr);
      return False;
  }

  ubi_slAddTail(&blocking_lock_queue, blr);

  /* Ensure we'll receive messages when this is unlocked. */
  if (!set_lock_msg) {
        message_register(MSG_SMB_UNLOCK, received_unlock_msg);
        set_lock_msg = True;
  }

  DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d (+%d) \
for fnum = %d, name = %s\n", length, (int)blr->expire_time, lock_timeout,
        blr->fsp->fnum, blr->fsp->fsp_name ));

  return True;
}

/****************************************************************************
 Return a smd with a given size.
*****************************************************************************/

static void send_blocking_reply(char *outbuf, int outsize)
{
      if(outsize > 4)
            smb_setlen(outbuf,outsize - 4);

      if (!send_smb(smbd_server_fd(),outbuf))
            exit_server("send_blocking_reply: send_smb failed.");
}

/****************************************************************************
 Return a lockingX success SMB.
*****************************************************************************/

static void reply_lockingX_success(blocking_lock_record *blr)
{
  char *outbuf = OutBuffer;
  int bufsize = BUFFER_SIZE;
  char *inbuf = blr->inbuf;
  int outsize = 0;

  construct_reply_common(inbuf, outbuf);
  set_message(outbuf,2,0,True);

  /*
   * As this message is a lockingX call we must handle
   * any following chained message correctly.
   * This is normally handled in construct_reply(),
   * but as that calls switch_message, we can't use
   * that here and must set up the chain info manually.
   */

  outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);

  outsize += chain_size;

  send_blocking_reply(outbuf,outsize);
}

/****************************************************************************
 Return a generic lock fail error blocking call.
*****************************************************************************/

static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
{
      char *outbuf = OutBuffer;
      char *inbuf = blr->inbuf;
      construct_reply_common(inbuf, outbuf);

      /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
         FILE_LOCK_CONFLICT! (tridge) */
      if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
            status = NT_STATUS_FILE_LOCK_CONFLICT;
      }

      ERROR_NT(status);
      if (!send_smb(smbd_server_fd(),outbuf))
            exit_server("generic_blocking_lock_error: send_smb failed.");
}

/****************************************************************************
 Return a lock fail error for a lockingX call. Undo all the locks we have 
 obtained first.
*****************************************************************************/

static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
{
      char *inbuf = blr->inbuf;
      files_struct *fsp = blr->fsp;
      connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
      uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
      SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
      uint16 lock_pid;
      unsigned char locktype = CVAL(inbuf,smb_vwv3);
      BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
      char *data;
      int i;

      data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
      
      /* 
       * Data now points at the beginning of the list
       * of smb_lkrng structs.
       */

      /*
       * Ensure we don't do a remove on the lock that just failed,
       * as under POSIX rules, if we have a lock already there, we
       * will delete it (and we shouldn't) .....
       */
      
      for(i = blr->lock_num - 1; i >= 0; i--) {
            BOOL err;
            
            lock_pid = get_lock_pid( data, i, large_file_format);
            count = get_lock_count( data, i, large_file_format);
            offset = get_lock_offset( data, i, large_file_format, &err);
            
            /*
             * We know err cannot be set as if it was the lock
             * request would never have been queued. JRA.
             */
            
            do_unlock(fsp,conn,lock_pid,count,offset);
      }
      
      generic_blocking_lock_error(blr, status);
}

/****************************************************************************
 Return a lock fail error.
*****************************************************************************/

static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
{
      switch(blr->com_type) {
      case SMBlock:
      case SMBlockread:
            generic_blocking_lock_error(blr, status);
            break;
      case SMBlockingX:
            reply_lockingX_error(blr, status);
            break;
      default:
            DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
            exit_server("PANIC - unknown type on blocking lock queue");
      }
}

/****************************************************************************
 Attempt to finish off getting all pending blocking locks for a lockread call.
 Returns True if we want to be removed from the list.
*****************************************************************************/

static BOOL process_lockread(blocking_lock_record *blr)
{
      char *outbuf = OutBuffer;
      char *inbuf = blr->inbuf;
      ssize_t nread = -1;
      char *data, *p;
      int outsize = 0;
      SMB_BIG_UINT startpos;
      size_t numtoread;
      NTSTATUS status;
      connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
      files_struct *fsp = blr->fsp;

      numtoread = SVAL(inbuf,smb_vwv1);
      startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
      
      numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
      data = smb_buf(outbuf) + 3;
 
      status = do_lock_spin( fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)numtoread, 
                    startpos, READ_LOCK);
      if (NT_STATUS_V(status)) {
            if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
                  !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
                  /*
                   * We have other than a "can't get lock"
                   * error. Send an error.
                   * Return True so we get dequeued.
                   */
                  generic_blocking_lock_error(blr, status);
                  return True;
            }

            /*
             * Still waiting for lock....
             */
            
            DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
                    fsp->fsp_name));
            return False;
      }

      nread = read_file(fsp,data,startpos,numtoread);

      if (nread < 0) {
            generic_blocking_lock_error(blr,NT_STATUS_ACCESS_DENIED);
            return True;
      }
      
      construct_reply_common(inbuf, outbuf);
      outsize = set_message(outbuf,5,0,True);
      
      outsize += nread;
      SSVAL(outbuf,smb_vwv0,nread);
      SSVAL(outbuf,smb_vwv5,nread+3);
      p = smb_buf(outbuf);
      *p++ = 1;
      SSVAL(p,0,nread); p += 2;
      set_message_end(outbuf, p+nread);
      
      DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
               fsp->fsp_name, fsp->fnum, (int)numtoread, (int)nread ) );
      
      send_blocking_reply(outbuf,outsize);
      return True;
}

/****************************************************************************
 Attempt to finish off getting all pending blocking locks for a lock call.
 Returns True if we want to be removed from the list.
*****************************************************************************/

static BOOL process_lock(blocking_lock_record *blr)
{
      char *outbuf = OutBuffer;
      char *inbuf = blr->inbuf;
      int outsize;
      SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
      NTSTATUS status;
      connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
      files_struct *fsp = blr->fsp;

      count = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv1);
      offset = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv3);

      errno = 0;
      status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), count, 
                   offset, WRITE_LOCK);
      if (NT_STATUS_IS_ERR(status)) {
            if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
                  !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
                  /*
                   * We have other than a "can't get lock"
                   * error. Send an error.
                   * Return True so we get dequeued.
                   */
                  
                  blocking_lock_reply_error(blr, status);
                  return True;
            }
            /*
             * Still can't get the lock - keep waiting.
             */
            DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
                    fsp->fsp_name));
            return False;
      }

      /*
       * Success - we got the lock.
       */
      
      DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
             fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
      
      construct_reply_common(inbuf, outbuf);
      outsize = set_message(outbuf,0,0,True);
      send_blocking_reply(outbuf,outsize);
      return True;
}

/****************************************************************************
 Attempt to finish off getting all pending blocking locks for a lockingX call.
 Returns True if we want to be removed from the list.
*****************************************************************************/

static BOOL process_lockingX(blocking_lock_record *blr)
{
      char *inbuf = blr->inbuf;
      unsigned char locktype = CVAL(inbuf,smb_vwv3);
      files_struct *fsp = blr->fsp;
      connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
      uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
      uint16 num_locks = SVAL(inbuf,smb_vwv7);
      SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
      uint16 lock_pid;
      BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
      char *data;
      NTSTATUS status = NT_STATUS_OK;

      data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);

      /* 
       * Data now points at the beginning of the list
       * of smb_lkrng structs.
       */
      
      for(; blr->lock_num < num_locks; blr->lock_num++) {
            BOOL err;

            lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
            count = get_lock_count( data, blr->lock_num, large_file_format);
            offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
            
            /*
             * We know err cannot be set as if it was the lock
             * request would never have been queued. JRA.
             */
            errno = 0;
            status = do_lock_spin(fsp,conn,lock_pid,count,offset, 
                         ((locktype & 1) ? READ_LOCK : WRITE_LOCK));
            if (NT_STATUS_IS_ERR(status)) break;
      }

      if(blr->lock_num == num_locks) {
            /*
             * Success - we got all the locks.
             */
            
            DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
                   fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );

            reply_lockingX_success(blr);
            return True;
      } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
                  !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
                  /*
                   * We have other than a "can't get lock"
                   * error. Free any locks we had and return an error.
                   * Return True so we get dequeued.
                   */
            
            blocking_lock_reply_error(blr, status);
            return True;
      }

      /*
       * Still can't get all the locks - keep waiting.
       */
      
      DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
Waiting....\n", 
              blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
      
      return False;
}

/****************************************************************************
 Process a blocking lock SMB.
 Returns True if we want to be removed from the list.
*****************************************************************************/

static BOOL blocking_lock_record_process(blocking_lock_record *blr)
{
  switch(blr->com_type) {
  case SMBlock:
    return process_lock(blr);
  case SMBlockread:
    return process_lockread(blr);
  case SMBlockingX:
    return process_lockingX(blr);
  default:
    DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
    exit_server("PANIC - unknown type on blocking lock queue");
  }
  return False; /* Keep compiler happy. */
}

/****************************************************************************
 Delete entries by fnum from the blocking lock pending queue.
*****************************************************************************/

void remove_pending_lock_requests_by_fid(files_struct *fsp)
{
  blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
  blocking_lock_record *prev = NULL;

  while(blr != NULL) {
    if(blr->fsp->fnum == fsp->fnum) {

      DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));

      brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
            blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
            blr->offset, blr->count, True);

      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      continue;
    }

    prev = blr;
    blr = (blocking_lock_record *)ubi_slNext(blr);
  }
}

/****************************************************************************
 Delete entries by mid from the blocking lock pending queue. Always send reply.
*****************************************************************************/

void remove_pending_lock_requests_by_mid(int mid)
{
  blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
  blocking_lock_record *prev = NULL;

  while(blr != NULL) {
    if(SVAL(blr->inbuf,smb_mid) == mid) {
      files_struct *fsp = blr->fsp;

      DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));

      blocking_lock_reply_error(blr,NT_STATUS_CANCELLED);
      brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
            blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
            blr->offset, blr->count, True);
      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      continue;
    }

    prev = blr;
    blr = (blocking_lock_record *)ubi_slNext(blr);
  }
}

/****************************************************************************
 Set a flag as an unlock request affects one of our pending locks.
*****************************************************************************/

static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len)
{
      DEBUG(10,("received_unlock_msg\n"));
      process_blocking_lock_queue(time(NULL));
}

/****************************************************************************
 Return the number of seconds to the next blocking locks timeout, or default_timeout.
*****************************************************************************/

unsigned blocking_locks_timeout(unsigned default_timeout)
{
      unsigned timeout = default_timeout;
      time_t t;
      blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst(&blocking_lock_queue);

      /* note that we avoid the time() syscall if there are no blocking locks */
      if (!blr)
            return timeout;

      t = time(NULL);

      while (blr) {
            if ((blr->expire_time != (time_t)-1) && 
                        (timeout > (blr->expire_time - t))) {
                  timeout = blr->expire_time - t;
            }
            blr = (blocking_lock_record *)ubi_slNext(blr);
      }

      if (timeout < 1)
            timeout = 1;

      return timeout;
}

/****************************************************************************
 Process the blocking lock queue. Note that this is only called as root.
*****************************************************************************/

void process_blocking_lock_queue(time_t t)
{
  blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
  blocking_lock_record *prev = NULL;

  if(blr == NULL)
    return;

  /*
   * Go through the queue and see if we can get any of the locks.
   */

  while(blr != NULL) {
    connection_struct *conn = NULL;
    uint16 vuid;
    files_struct *fsp = NULL;

    /*
     * Ensure we don't have any old chain_fsp values
     * sitting around....
     */
    chain_size = 0;
    file_chain_reset();
    fsp = blr->fsp;

    conn = conn_find(SVAL(blr->inbuf,smb_tid));
    vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
                  SVAL(blr->inbuf,smb_uid);

    DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
          fsp->fnum, fsp->fsp_name ));

    if((blr->expire_time != -1) && (blr->expire_time <= t)) {
      /*
       * Lock expired - throw away all previously
       * obtained locks and return lock error.
       */
      DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
          fsp->fnum, fsp->fsp_name ));

      brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
            blr->lock_pid, sys_getpid(), conn->cnum,
            blr->offset, blr->count, True);

      blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      continue;
    }

    if(!change_to_user(conn,vuid)) {
      DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
            vuid ));
      /*
       * Remove the entry and return an error to the client.
       */
      blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);

      brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
            blr->lock_pid, sys_getpid(), conn->cnum,
            blr->offset, blr->count, True);

      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      continue;
    }

    if(!set_current_service(conn,True)) {
      DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
      /*
       * Remove the entry and return an error to the client.
       */
      blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);

      brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
            blr->lock_pid, sys_getpid(), conn->cnum,
            blr->offset, blr->count, True);

      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      change_to_root_user();
      continue;
    }

    /*
     * Go through the remaining locks and try and obtain them.
     * The call returns True if all locks were obtained successfully
     * and False if we still need to wait.
     */

    if(blocking_lock_record_process(blr)) {

      brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
            blr->lock_pid, sys_getpid(), conn->cnum,
            blr->offset, blr->count, True);

      free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
      blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
      change_to_root_user();
      continue;
    }

    change_to_root_user();

    /*
     * Move to the next in the list.
     */
    prev = blr;
    blr = (blocking_lock_record *)ubi_slNext(blr);
  }
}

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