Remove some unused fields of trx_t: mysql_master_log_file_name,

mysql_master_log_pos, repl_wait_binlog_name, repl_wait_binlog_pos.

Approved by Heikki.

include/trx0trx.h

@@ -482,31 +482,6 @@ struct trx_struct{
 	ib_longlong	mysql_log_offset;/* if MySQL binlog is used, this field
 					contains the end offset of the binlog
 					entry */
-	const char*	mysql_master_log_file_name;
-					/* if the database server is a MySQL
-					replication slave, we have here the
-					master binlog name up to which
-					replication has processed; otherwise
-					this is a pointer to a null
-					character */
-	ib_longlong	mysql_master_log_pos;
-					/* if the database server is a MySQL
-					replication slave, this is the
-					position in the log file up to which
-					replication has processed */
-	/* A MySQL variable mysql_thd->synchronous_repl tells if we have
-	to use synchronous replication. See ha_innodb.cc. */
-	char*		repl_wait_binlog_name;/* NULL, or if synchronous MySQL
-					replication is used, the binlog name
-					up to which we must communicate the
-					binlog to the slave, before returning
-					from a commit; this is the same as
-					mysql_log_file_name, but we allocate
-					and copy the name to a separate buffer
-					here */
-	ib_longlong	repl_wait_binlog_pos;/* see above at
-					repl_wait_binlog_name */
-
 	os_thread_id_t	mysql_thread_id;/* id of the MySQL thread associated
 					with this transaction object */
 	ulint		mysql_process_no;/* since in Linux, 'top' reports

trx/trx0trx.c

@@ -139,11 +139,6 @@ trx_create(
 
 	trx->mysql_log_file_name = NULL;
 	trx->mysql_log_offset = 0;
-	trx->mysql_master_log_file_name = "";
-	trx->mysql_master_log_pos = 0;
-
-	trx->repl_wait_binlog_name = NULL;
-	trx->repl_wait_binlog_pos = 0;
 
 	mutex_create(&trx->undo_mutex, SYNC_TRX_UNDO);
 
@@ -325,11 +320,6 @@ trx_free(
 		trx_undo_arr_free(trx->undo_no_arr);
 	}
 
-	if (trx->repl_wait_binlog_name != NULL) {
-
-		mem_free(trx->repl_wait_binlog_name);
-	}
-
 	ut_a(UT_LIST_GET_LEN(trx->signals) == 0);
 	ut_a(UT_LIST_GET_LEN(trx->reply_signals) == 0);
 
@@ -809,14 +799,6 @@ trx_commit_off_kernel(
 			trx->mysql_log_file_name = NULL;
 		}
 
-		if (trx->mysql_master_log_file_name[0] != '\0') {
-			/* This database server is a MySQL replication slave */
-			trx_sys_update_mysql_binlog_offset(
-				trx->mysql_master_log_file_name,
-				trx->mysql_master_log_pos,
-				TRX_SYS_MYSQL_MASTER_LOG_INFO, &mtr);
-		}
-
 		/* The following call commits the mini-transaction, making the
 		whole transaction committed in the file-based world, at this
 		log sequence number. The transaction becomes 'durable' when