cleanup: LOAD DATA replication support in IO_CACHE

remove some 14-year old code that added support for
LOAD DATA replication to IO_CACHE:
* three callbacks, of which only two were actually used and that
  were only needed for LOAD DATA replication but were
  tested in every IO_CACHE instance
* an additional opaque void * argument in IO_CACHE, also only
  used for LOAD DATA replication, but present everywhere
* the code to close IO_CACHE prematurely in LOAD DATA to have
  these callbacks called in the correct order and a long
  comment explaining what will happen if IO_CACHE is not
  closed prematurely
* a variable to track whether IO_CACHE was closed prematurely
  (to avoid double-closing it)

1 files changed, 8 insertions, 3 deletions

diff --git a/sql/sql_repl.h b/sql/sql_repl.h
index 7f7751b8f44..a9fdce9e5e2 100644
--- a/sql/sql_repl.h
+++ b/sql/sql_repl.h
@@ -56,14 +56,15 @@ extern int init_master_info(Master_info* mi);
 void kill_zombie_dump_threads(uint32 slave_server_id);
 int check_binlog_magic(IO_CACHE* log, const char** errmsg);
 
-typedef struct st_load_file_info
+struct LOAD_FILE_IO_CACHE : public IO_CACHE
 {
   THD* thd;
   my_off_t last_pos_in_file;
   bool wrote_create_file, log_delayed;
-} LOAD_FILE_INFO;
+  int (*real_read_function)(struct st_io_cache *,uchar *,size_t);
+};
 
-int log_loaded_block(IO_CACHE* file);
+int log_loaded_block(IO_CACHE* file, uchar *Buffer, size_t Count);
 int init_replication_sys_vars();
 void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos, ushort flags);
 
@@ -80,6 +81,10 @@ int rpl_load_gtid_state(slave_connection_state *state, bool use_binlog);
 bool rpl_gtid_pos_check(THD *thd, char *str, size_t len);
 bool rpl_gtid_pos_update(THD *thd, char *str, size_t len);
 
+#else
+
+struct LOAD_FILE_IO_CACHE : public IO_CACHE { };
+
 #endif /* HAVE_REPLICATION */
 
 #endif /* SQL_REPL_INCLUDED */