cleanup

removal of duplicate code in mf_iocache.cc 
work on failsafe replication
work on SEQ_READ_APPEND io cache


include/my_sys.h:
  updates for SEQ_READ_APPEND
libmysql/Makefile.am:
  fix for mysys/mf_iocache.c
libmysql/libmysql.c:
  updates for new format of SHOW SLAVE HOSTS
mysql-test/r/rpl000001.result:
  test replication of LOAD DATA LOCAL INFILE
mysql-test/r/rpl000002.result:
  updated test result
mysql-test/t/rpl000001.test:
  test LOAD DATA LOCAL INFILE
mysys/mf_iocache.c:
  cleanup to remove duplicate functionality
  some work on SEQ_READ_APPEND
sql/mf_iocache.cc:
  cleanup to remove duplicate functionality
sql/repl_failsafe.cc:
  more work on failsafe replication
sql/repl_failsafe.h:
  more work on failsafe replication
sql/slave.cc:
  cleanup
  more work on failsafe replication
sql/sql_load.cc:
  fixed bug on replicating empty file loads
  got LOAD DATA LOCAL INFILE to work again, and to be replicated
sql/sql_repl.cc:
  cleanup
  more work on failsafe replication
sql/sql_repl.h:
  more work on failsafe replication

1 files changed, 1 insertions, 623 deletions

diff --git a/sql/mf_iocache.cc b/sql/mf_iocache.cc
index 40b98983291..55e953687a3 100644
--- a/sql/mf_iocache.cc
+++ b/sql/mf_iocache.cc
@@ -42,295 +42,6 @@ static void my_aiowait(my_aio_result *result);
 extern "C" {
 
 	/*
-	** if cachesize == 0 then use default cachesize (from s-file)
-	** if file == -1 then real_open_cached_file() will be called.
-	** returns 0 if ok
-	*/
-
-int init_io_cache(IO_CACHE *info, File file, uint cachesize,
-		  enum cache_type type, my_off_t seek_offset,
-		  pbool use_async_io, myf cache_myflags)
-{
-  uint min_cache;
-  DBUG_ENTER("init_io_cache");
-  DBUG_PRINT("enter",("type: %d  pos: %ld",(int) type, (ulong) seek_offset));
-
-  /* There is no file in net_reading */
-  info->file= file;
-  info->pre_close = info->pre_read = info->post_read = 0;
-  info->arg = 0;
-  if (!cachesize)
-    if (! (cachesize= my_default_record_cache_size))
-      DBUG_RETURN(1);				/* No cache requested */
-  min_cache=use_async_io ? IO_SIZE*4 : IO_SIZE*2;
-  if (type == READ_CACHE)
-  {						/* Assume file isn't growing */
-    if (cache_myflags & MY_DONT_CHECK_FILESIZE)
-    {
-      cache_myflags &= ~MY_DONT_CHECK_FILESIZE;
-    }
-    else
-    {
-      my_off_t file_pos,end_of_file;
-      if ((file_pos=my_tell(file,MYF(0)) == MY_FILEPOS_ERROR))
-	DBUG_RETURN(1);
-      end_of_file=my_seek(file,0L,MY_SEEK_END,MYF(0));
-      if (end_of_file < seek_offset)
-	end_of_file=seek_offset;
-      VOID(my_seek(file,file_pos,MY_SEEK_SET,MYF(0)));
-      if ((my_off_t) cachesize > end_of_file-seek_offset+IO_SIZE*2-1)
-      {
-	cachesize=(uint) (end_of_file-seek_offset)+IO_SIZE*2-1;
-	use_async_io=0;				/* No need to use async */
-      }
-    }
-  }
-  if ((int) type < (int) READ_NET)
-  {
-    for (;;)
-    {
-      cachesize=(uint) ((ulong) (cachesize + min_cache-1) &
-			(ulong) ~(min_cache-1));
-      if (cachesize < min_cache)
-	cachesize = min_cache;
-      if ((info->buffer=
-	   (byte*) my_malloc(cachesize,
-			     MYF((cache_myflags & ~ MY_WME) |
-				 (cachesize == min_cache ? MY_WME : 0)))) != 0)
-	break;					/* Enough memory found */
-      if (cachesize == min_cache)
-	DBUG_RETURN(2);				/* Can't alloc cache */
-      cachesize= (uint) ((long) cachesize*3/4); /* Try with less memory */
-    }
-  }
-  else
-    info->buffer=0;
-  DBUG_PRINT("info",("init_io_cache: cachesize = %u",cachesize));
-  info->pos_in_file= seek_offset;
-  info->read_length=info->buffer_length=cachesize;
-  info->seek_not_done= test(file >= 0 && type != READ_FIFO &&
-			    type != READ_NET);
-  info->myflags=cache_myflags & ~(MY_NABP | MY_FNABP);
-  info->rc_request_pos=info->rc_pos=info->buffer;
-
-  if (type == READ_CACHE || type == READ_NET || type == READ_FIFO)
-  {
-    info->rc_end=info->buffer;			/* Nothing in cache */
-  }
-  else /* type == WRITE_CACHE */
-  {
-    info->rc_end=info->buffer+info->buffer_length- (seek_offset & (IO_SIZE-1));
-  }
-  /* end_of_file may be changed by user later */
-  info->end_of_file= ((type == READ_NET || type == READ_FIFO ) ? 0
-		      : ~(my_off_t) 0);
-  info->type=type;
-  info->error=0;
-  info->read_function=(type == READ_NET) ? _my_b_net_read : _my_b_read; /* net | file */
-#ifdef HAVE_AIOWAIT
-  if (use_async_io && ! my_disable_async_io)
-  {
-    DBUG_PRINT("info",("Using async io"));
-    info->read_length/=2;
-    info->read_function=_my_b_async_read;
-  }
-  info->inited=info->aio_result.pending=0;
-#endif
-  DBUG_RETURN(0);
-}						/* init_io_cache */
-
-
-	/* Wait until current request is ready */
-
-#ifdef HAVE_AIOWAIT
-static void my_aiowait(my_aio_result *result)
-{
-  if (result->pending)
-  {
-    struct aio_result_t *tmp;
-    for (;;)
-    {
-      if ((int) (tmp=aiowait((struct timeval *) 0)) == -1)
-      {
-	if (errno == EINTR)
-	  continue;
-	DBUG_PRINT("error",("No aio request, error: %d",errno));
-	result->pending=0;			/* Assume everythings is ok */
-	break;
-      }
-      ((my_aio_result*) tmp)->pending=0;
-      if ((my_aio_result*) tmp == result)
-	break;
-    }
-  }
-  return;
-}
-#endif
-
-	/* Use this to reset cache to start or other type */
-	/* Some simple optimizing is done when reinit in current buffer */
-
-my_bool reinit_io_cache(IO_CACHE *info, enum cache_type type,
-			my_off_t seek_offset,
-			pbool use_async_io __attribute__((unused)),
-			pbool clear_cache)
-{
-  DBUG_ENTER("reinit_io_cache");
-
-  info->seek_not_done= test(info->file >= 0);	/* Seek not done */
-
-  /* If the whole file is in memory, avoid flushing to disk */
-  if (! clear_cache &&
-      seek_offset >= info->pos_in_file &&
-      seek_offset <= info->pos_in_file +
-      (uint) (info->rc_end - info->rc_request_pos))
-  {						/* use current buffer */
-    if (info->type == WRITE_CACHE && type == READ_CACHE)
-    {
-      info->rc_end=info->rc_pos;
-      info->end_of_file=my_b_tell(info);
-    }
-    else if (type == WRITE_CACHE)
-    {
-      if (info->type == READ_CACHE)
-	info->rc_end=info->buffer+info->buffer_length;
-      info->end_of_file = ~(my_off_t) 0;
-    }
-    info->rc_pos=info->rc_request_pos+(seek_offset-info->pos_in_file);
-#ifdef HAVE_AIOWAIT
-    my_aiowait(&info->aio_result);		/* Wait for outstanding req */
-#endif
-  }
-  else
-  {
-    /*
-      If we change from WRITE_CACHE to READ_CACHE, assume that everything
-      after the current positions should be ignored
-    */
-    if (info->type == WRITE_CACHE && type == READ_CACHE)
-      info->end_of_file=my_b_tell(info);
-    /* No need to flush cache if we want to reuse it */
-    if ((type != WRITE_CACHE || !clear_cache) && flush_io_cache(info))
-      DBUG_RETURN(1);
-    if (info->pos_in_file != seek_offset)
-    {
-      info->pos_in_file=seek_offset;
-      info->seek_not_done=1;
-    }
-    info->rc_request_pos=info->rc_pos=info->buffer;
-    if (type == READ_CACHE || type == READ_NET || type == READ_FIFO)
-    {
-      info->rc_end=info->buffer;		/* Nothing in cache */
-    }
-    else
-    {
-      info->rc_end=info->buffer+info->buffer_length-
-	(seek_offset & (IO_SIZE-1));
-      info->end_of_file= ((type == READ_NET || type == READ_FIFO) ? 0 :
-			  ~(my_off_t) 0);
-    }
-  }
-  info->type=type;
-  info->error=0;
-  info->read_function=(type == READ_NET) ? _my_b_net_read : _my_b_read;
-#ifdef HAVE_AIOWAIT
-  if (type != READ_NET)
-  {
-    if (use_async_io && ! my_disable_async_io &&
-	((ulong) info->buffer_length <
-	 (ulong) (info->end_of_file - seek_offset)))
-    {
-      info->read_length=info->buffer_length/2;
-      info->read_function=_my_b_async_read;
-    }
-  }
-  info->inited=0;
-#endif
-  DBUG_RETURN(0);
-} /* init_io_cache */
-
-
-
-	/*
-	  Read buffered. Returns 1 if can't read requested characters
-	  This function is only called from the my_b_read() macro
-	  when there isn't enough characters in the buffer to
-	  satisfy the request.
-	  Returns 0 we succeeded in reading all data
-	*/
-
-int _my_b_read(register IO_CACHE *info, byte *Buffer, uint Count)
-{
-  uint length,diff_length,left_length;
-  my_off_t max_length, pos_in_file;
-  
-  if ((left_length=(uint) (info->rc_end-info->rc_pos)))
-  {
-    dbug_assert(Count >= left_length);	/* User is not using my_b_read() */
-    memcpy(Buffer,info->rc_pos, (size_t) (left_length));
-    Buffer+=left_length;
-    Count-=left_length;
-  }
-  /* pos_in_file always point on where info->buffer was read */
-  pos_in_file=info->pos_in_file+(uint) (info->rc_end - info->buffer);
-  if (info->seek_not_done)
-  {					/* File touched, do seek */
-    VOID(my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(0)));
-    info->seek_not_done=0;
-  }
-  diff_length=(uint) (pos_in_file & (IO_SIZE-1));
-  if (Count >= (uint) (IO_SIZE+(IO_SIZE-diff_length)))
-  {					/* Fill first intern buffer */
-    uint read_length;
-    if (info->end_of_file == pos_in_file)
-    {					/* End of file */
-      info->error=(int) left_length;
-      return 1;
-    }
-    length=(Count & (uint) ~(IO_SIZE-1))-diff_length;
-    if ((read_length=my_read(info->file,Buffer,(uint) length,info->myflags))
-	!= (uint) length)
-    {
-      info->error= read_length == (uint) -1 ? -1 :
-	(int) (read_length+left_length);
-      return 1;
-    }
-    Count-=length;
-    Buffer+=length;
-    pos_in_file+=length;
-    left_length+=length;
-    diff_length=0;
-  }
-  max_length=info->read_length-diff_length;
-  if (info->type != READ_FIFO &&
-      (info->end_of_file - pos_in_file) < max_length)
-    max_length = info->end_of_file - pos_in_file;
-  if (!max_length)
-  {
-    if (Count)
-    {
-      info->error= left_length;		/* We only got this many char */
-      return 1;
-    }
-    length=0;				/* Didn't read any chars */
-  }
-  else if ((length=my_read(info->file,info->buffer,(uint) max_length,
-			   info->myflags)) < Count ||
-	   length == (uint) -1)
-  {
-    if (length != (uint) -1)
-      memcpy(Buffer,info->buffer,(size_t) length);
-    info->error= length == (uint) -1 ? -1 : (int) (length+left_length);
-    return 1;
-  }
-  info->rc_pos=info->buffer+Count;
-  info->rc_end=info->buffer+length;
-  info->pos_in_file=pos_in_file;
-  memcpy(Buffer,info->buffer,(size_t) Count);
-  return 0;
-}
-
-	/*
 	** Read buffered from the net.
 	** Returns 1 if can't read requested characters
 	** Returns 0 if record read
@@ -359,341 +70,8 @@ int _my_b_net_read(register IO_CACHE *info, byte *Buffer,
   info->rc_end = (info->rc_pos = (byte*) net->read_pos) + read_length;
   Buffer[0] = info->rc_pos[0];			/* length is always 1 */
   info->rc_pos++;
+  info->buffer = info->rc_pos;
   return 0;
 }
 
-#ifdef HAVE_AIOWAIT
-
-int _my_b_async_read(register IO_CACHE *info, byte *Buffer, uint Count)
-{
-  uint length,read_length,diff_length,left_length,use_length,org_Count;
-  my_off_t max_length;
-  my_off_t next_pos_in_file;
-  byte *read_buffer;
-
-  memcpy(Buffer,info->rc_pos,
-	 (size_t) (left_length=(uint) (info->rc_end-info->rc_pos)));
-  Buffer+=left_length;
-  org_Count=Count;
-  Count-=left_length;
-
-  if (info->inited)
-  {						/* wait for read block */
-    info->inited=0;				/* No more block to read */
-    my_aiowait(&info->aio_result);		/* Wait for outstanding req */
-    if (info->aio_result.result.aio_errno)
-    {
-      if (info->myflags & MY_WME)
-	my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG),
-		 my_filename(info->file),
-		 info->aio_result.result.aio_errno);
-      my_errno=info->aio_result.result.aio_errno;
-      info->error= -1;
-      return(1);
-    }
-    if (! (read_length = (uint) info->aio_result.result.aio_return) ||
-	read_length == (uint) -1)
-    {
-      my_errno=0;				/* For testing */
-      info->error= (read_length == (uint) -1 ? -1 :
-		    (int) (read_length+left_length));
-      return(1);
-    }
-    info->pos_in_file+=(uint) (info->rc_end - info->rc_request_pos);
-
-    if (info->rc_request_pos != info->buffer)
-      info->rc_request_pos=info->buffer;
-    else
-      info->rc_request_pos=info->buffer+info->read_length;
-    info->rc_pos=info->rc_request_pos;
-    next_pos_in_file=info->aio_read_pos+read_length;
-
-	/* Check if pos_in_file is changed
-	   (_ni_read_cache may have skipped some bytes) */
-
-    if (info->aio_read_pos < info->pos_in_file)
-    {						/* Fix if skipped bytes */
-      if (info->aio_read_pos + read_length < info->pos_in_file)
-      {
-	read_length=0;				/* Skipp block */
-	next_pos_in_file=info->pos_in_file;
-      }
-      else
-      {
-	my_off_t offset= (info->pos_in_file - info->aio_read_pos);
-	info->pos_in_file=info->aio_read_pos; /* Whe are here */
-	info->rc_pos=info->rc_request_pos+offset;
-	read_length-=offset;			/* Bytes left from rc_pos */
-      }
-    }
-#ifndef DBUG_OFF
-    if (info->aio_read_pos > info->pos_in_file)
-    {
-      my_errno=EINVAL;
-      return(info->read_length= -1);
-    }
-#endif
-	/* Copy found bytes to buffer */
-    length=min(Count,read_length);
-    memcpy(Buffer,info->rc_pos,(size_t) length);
-    Buffer+=length;
-    Count-=length;
-    left_length+=length;
-    info->rc_end=info->rc_pos+read_length;
-    info->rc_pos+=length;
-  }
-  else
-    next_pos_in_file=(info->pos_in_file+ (uint)
-		      (info->rc_end - info->rc_request_pos));
-
-	/* If reading large blocks, or first read or read with skipp */
-  if (Count)
-  {
-    if (next_pos_in_file == info->end_of_file)
-    {
-      info->error=(int) (read_length+left_length);
-      return 1;
-    }
-    VOID(my_seek(info->file,next_pos_in_file,MY_SEEK_SET,MYF(0)));
-    read_length=IO_SIZE*2- (uint) (next_pos_in_file & (IO_SIZE-1));
-    if (Count < read_length)
-    {					/* Small block, read to cache */
-      if ((read_length=my_read(info->file,info->rc_request_pos,
-			       read_length, info->myflags)) == (uint) -1)
-	return info->error= -1;
-      use_length=min(Count,read_length);
-      memcpy(Buffer,info->rc_request_pos,(size_t) use_length);
-      info->rc_pos=info->rc_request_pos+Count;
-      info->rc_end=info->rc_request_pos+read_length;
-      info->pos_in_file=next_pos_in_file;	/* Start of block in cache */
-      next_pos_in_file+=read_length;
-
-      if (Count != use_length)
-      {					/* Didn't find hole block */
-	if (info->myflags & (MY_WME | MY_FAE | MY_FNABP) && Count != org_Count)
-	  my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG),
-		   my_filename(info->file),my_errno);
-	info->error=(int) (read_length+left_length);
-	return 1;
-      }
-    }
-    else
-    {						/* Big block, don't cache it */
-      if ((read_length=my_read(info->file,Buffer,(uint) Count,info->myflags))
-	  != Count)
-      {
-	info->error= read_length == (uint)  -1 ? -1 : read_length+left_length;
-	return 1;
-      }
-      info->rc_pos=info->rc_end=info->rc_request_pos;
-      info->pos_in_file=(next_pos_in_file+=Count);
-    }
-  }
-
-	/* Read next block with asyncronic io */
-  max_length=info->end_of_file - next_pos_in_file;
-  diff_length=(next_pos_in_file & (IO_SIZE-1));
-
-  if (max_length > (my_off_t) info->read_length - diff_length)
-    max_length= (my_off_t) info->read_length - diff_length;
-  if (info->rc_request_pos != info->buffer)
-    read_buffer=info->buffer;
-  else
-    read_buffer=info->buffer+info->read_length;
-  info->aio_read_pos=next_pos_in_file;
-  if (max_length)
-  {
-    info->aio_result.result.aio_errno=AIO_INPROGRESS;	/* Marker for test */
-    DBUG_PRINT("aioread",("filepos: %ld  length: %ld",
-			  (ulong) next_pos_in_file,(ulong) max_length));
-    if (aioread(info->file,read_buffer,(int) max_length,
-		(my_off_t) next_pos_in_file,MY_SEEK_SET,
-		&info->aio_result.result))
-    {						/* Skipp async io */
-      my_errno=errno;
-      DBUG_PRINT("error",("got error: %d, aio_result: %d from aioread, async skipped",
-			  errno, info->aio_result.result.aio_errno));
-      if (info->rc_request_pos != info->buffer)
-      {
-	bmove(info->buffer,info->rc_request_pos,
-	      (uint) (info->rc_end - info->rc_pos));
-	info->rc_request_pos=info->buffer;
-	info->rc_pos-=info->read_length;
-	info->rc_end-=info->read_length;
-      }
-      info->read_length=info->buffer_length;	/* Use hole buffer */
-      info->read_function=_my_b_read;		/* Use normal IO_READ next */
-    }
-    else
-      info->inited=info->aio_result.pending=1;
-  }
-  return 0;					/* Block read, async in use */
-} /* _my_b_async_read */
-#endif
-
-
-/* Read one byte when buffer is empty */
-
-int _my_b_get(IO_CACHE *info)
-{
-  byte buff;
-  IO_CACHE_CALLBACK pre_read,post_read;
-  if ((pre_read = info->pre_read))
-    (*pre_read)(info);
-  if ((*(info)->read_function)(info,&buff,1))
-    return my_b_EOF;
-  if ((post_read = info->post_read))
-    (*post_read)(info);
-  return (int) (uchar) buff;
-}
-
-	/* Returns != 0 if error on write */
-
-int _my_b_write(register IO_CACHE *info, const byte *Buffer, uint Count)
-{
-  uint rest_length,length;
-
-  rest_length=(uint) (info->rc_end - info->rc_pos);
-  memcpy(info->rc_pos,Buffer,(size_t) rest_length);
-  Buffer+=rest_length;
-  Count-=rest_length;
-  info->rc_pos+=rest_length;
-  if (info->pos_in_file+info->buffer_length > info->end_of_file)
-  {
-    my_errno=errno=EFBIG;
-    return info->error = -1;
-  }    
-  if (flush_io_cache(info))
-    return 1;
-  if (Count >= IO_SIZE)
-  {					/* Fill first intern buffer */
-    length=Count & (uint) ~(IO_SIZE-1);
-    if (info->seek_not_done)
-    {					/* File touched, do seek */
-      VOID(my_seek(info->file,info->pos_in_file,MY_SEEK_SET,MYF(0)));
-      info->seek_not_done=0;
-    }
-    if (my_write(info->file,Buffer,(uint) length,info->myflags | MY_NABP))
-      return info->error= -1;
-    Count-=length;
-    Buffer+=length;
-    info->pos_in_file+=length;
-  }
-  memcpy(info->rc_pos,Buffer,(size_t) Count);
-  info->rc_pos+=Count;
-  return 0;
-}
-
-
-/*
-  Write a block to disk where part of the data may be inside the record
-  buffer.  As all write calls to the data goes through the cache,
-  we will never get a seek over the end of the buffer
-*/
-
-int my_block_write(register IO_CACHE *info, const byte *Buffer, uint Count,
-		   my_off_t pos)
-{
-  uint length;
-  int error=0;
-
-  if (pos < info->pos_in_file)
-  {
-    /* Of no overlap, write everything without buffering */
-    if (pos + Count <= info->pos_in_file)
-      return my_pwrite(info->file, Buffer, Count, pos,
-		       info->myflags | MY_NABP);
-    /* Write the part of the block that is before buffer */
-    length= (uint) (info->pos_in_file - pos);
-    if (my_pwrite(info->file, Buffer, length, pos, info->myflags | MY_NABP))
-      info->error=error=-1;
-    Buffer+=length;
-    pos+=  length;
-    Count-= length;
-  }
-
-  /* Check if we want to write inside the used part of the buffer.*/
-  length= (uint) (info->rc_end - info->buffer);
-  if (pos < info->pos_in_file + length)
-  {
-    uint offset= (uint) (pos - info->pos_in_file);
-    length-=offset;
-    if (length > Count)
-      length=Count;
-    memcpy(info->buffer+offset, Buffer, length);
-    Buffer+=length;
-    Count-= length;
-    /* Fix length of buffer if the new data was larger */
-    if (info->buffer+length > info->rc_pos)
-      info->rc_pos=info->buffer+length;
-    if (!Count)
-      return (error);
-  }
-  /* Write at the end of the current buffer; This is the normal case */
-  if (_my_b_write(info, Buffer, Count))
-    error= -1;
-  return error;
-}
-
-	/* Flush write cache */
-
-int flush_io_cache(IO_CACHE *info)
-{
-  uint length;
-  DBUG_ENTER("flush_io_cache");
-
-  if (info->type == WRITE_CACHE)
-  {
-    if (info->file == -1)
-    {
-      if (real_open_cached_file(info))
-	DBUG_RETURN((info->error= -1));
-    }
-    if (info->rc_pos != info->buffer)
-    {
-      length=(uint) (info->rc_pos - info->buffer);
-      if (info->seek_not_done)
-      {					/* File touched, do seek */
-	if (my_seek(info->file,info->pos_in_file,MY_SEEK_SET,MYF(0)) ==
-	    MY_FILEPOS_ERROR)
-	  DBUG_RETURN((info->error= -1));
-	info->seek_not_done=0;
-      }
-      info->rc_pos=info->buffer;
-      info->pos_in_file+=length;
-      info->rc_end=(info->buffer+info->buffer_length-
-		    (info->pos_in_file & (IO_SIZE-1)));
-      if (my_write(info->file,info->buffer,length,info->myflags | MY_NABP))
-	DBUG_RETURN((info->error= -1));
-      DBUG_RETURN(0);
-    }
-  }
-#ifdef HAVE_AIOWAIT
-  else if (info->type != READ_NET)
-  {
-    my_aiowait(&info->aio_result);	/* Wait for outstanding req */
-    info->inited=0;
-  }
-#endif
-  DBUG_RETURN(0);
-}
-
-
-int end_io_cache(IO_CACHE *info)
-{
-  int error=0;
-  IO_CACHE_CALLBACK pre_close;
-  DBUG_ENTER("end_io_cache");
-  if((pre_close=info->pre_close))
-    (*pre_close)(info);
-  if (info->buffer)
-  {
-    if (info->file != -1)			/* File doesn't exist */
-      error=flush_io_cache(info);
-    my_free((gptr) info->buffer,MYF(MY_WME));
-    info->buffer=info->rc_pos=(byte*) 0;
-  }
-  DBUG_RETURN(error);
-} /* end_io_cache */
-
 } /* extern "C" */