added pre/post read callbacks to IO_CACHE

#ifdefed out code not used in the server from log events
started on new LOAD DATA INFILE events


include/my_sys.h:
  added pre/post read callbacks to IO_CACHe
mysys/mf_iocache.c:
  pre/post read callbacks
sql/log_event.cc:
  cleanup to #ifdef out unneeded code in the server
  started work on new Load data infile events
sql/log_event.h:
  clean-up plus start of new LOAD DATA INFILE events work
sql/mf_iocache.cc:
  pre/post read callbacks
sql/sql_class.cc:
  file_id
sql/sql_class.h:
  file_id

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/mf_iocache.cc b/sql/mf_iocache.cc
index cddacaa820f..bf2f2c37409 100644
--- a/sql/mf_iocache.cc
+++ b/sql/mf_iocache.cc
@@ -57,6 +57,7 @@ int init_io_cache(IO_CACHE *info, File file, uint cachesize,
 
   /* There is no file in net_reading */
   info->file= file;
+  info->pre_read = info->post_read = 0;
   if (!cachesize)
     if (! (cachesize= my_default_record_cache_size))
       DBUG_RETURN(1);				/* No cache requested */
@@ -535,8 +536,13 @@ int _my_b_async_read(register IO_CACHE *info, byte *Buffer, uint Count)
 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;
 }