Replacing class Disable_binlog by macros. Patch already approved by Monty.

sql/log.cc:
  removing unneeded class Disable_binlog
sql/sql_class.h:
  removing unneeded class Disable_binlog
sql/sql_table.cc:
  As discussed, class Disable_binlog is removed and replaced by macros.

sql/log.cc

@@ -1682,22 +1682,6 @@ void MYSQL_LOG::set_max_size(ulong max_size_arg)
 }
 
 
-Disable_binlog::Disable_binlog(THD *thd_arg) : 
-  thd(thd_arg),
-  save_options(thd_arg->options), save_master_access(thd_arg->master_access)
-{
-  thd_arg->options&= ~OPTION_BIN_LOG;
-  thd_arg->master_access|= SUPER_ACL; // unneeded in 4.1
-};
-
-
-Disable_binlog::~Disable_binlog()
-{
-  thd->options= save_options;
-  thd->master_access= save_master_access;
-}
-
-
 /*
   Check if a string is a valid number
 

sql/sql_class.h

@@ -638,27 +638,6 @@ public:
 #define SYSTEM_THREAD_SLAVE_IO 2
 #define SYSTEM_THREAD_SLAVE_SQL 4
 
-/*
-  Disables binary logging for one thread, and resets it back to what it was
-  before being disabled. 
-  Some functions (like the internal mysql_create_table() when it's called by
-  mysql_alter_table()) must NOT write to the binlog (binlogging is done at the
-  at a later stage of the command already, and must be, for locking reasons);
-  so we internally disable it temporarily by creating the Disable_binlog
-  object and reset the state by destroying the object (don't forget that! or
-  write code so that the object gets automatically destroyed when leaving a
-  block, see example in sql_table.cc).
-*/
-class Disable_binlog {
-private:
-  THD *thd;
-  ulong save_options;
-  ulong save_master_access;
-public:
-  Disable_binlog(THD *thd_arg);
-  ~Disable_binlog();
-};
-
 /*
   Used to hold information about file and file structure in exchainge 
   via non-DB file (...INTO OUTFILE..., ...LOAD DATA...)

sql/sql_table.cc

@@ -30,6 +30,16 @@
 #include <io.h>
 #endif
 
+#include "sql_acl.h" // for SUPER_ACL
+# define tmp_disable_binlog(A)                                          \
+  ulong save_options= (A)->options, save_master_access= (A)->master_access; \
+  (A)->options&= ~OPTION_BIN_LOG;                                       \
+  (A)->master_access|= SUPER_ACL; /* unneeded in 4.1 */                 
+
+#define reenable_binlog(A)                      \
+  (A)->options= save_options;                   \
+  (A)->master_access= save_master_access;       
+
 extern HASH open_cache;
 static const char *primary_key_name="PRIMARY";
 
@@ -840,9 +850,8 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
 			       MYSQL_LOCK **lock)
 {
   TABLE tmp_table;		// Used during 'create_field()'
-  TABLE *table;
+  TABLE *table= 0;
   tmp_table.table_name=0;
-  Disable_binlog disable_binlog(thd);
   DBUG_ENTER("create_table_from_items");
 
   /* Add selected items to field list */
@@ -872,23 +881,25 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
     extra_fields->push_back(cr_field);
   }
   /* create and lock table */
-  /* QQ: This should be done atomic ! */
+  /* QQ: create and open should be done atomic ! */
-  /* We don't log the statement, it will be logged later */
-  if (mysql_create_table(thd,db,name,create_info,*extra_fields,
-			 *keys,0))
-    DBUG_RETURN(0);
   /*
+    We don't log the statement, it will be logged later.
     If this is a HEAP table, the automatic DELETE FROM which is written to the
     binlog when a HEAP table is opened for the first time since startup, must
     not be written: 1) it would be wrong (imagine we're in CREATE SELECT: we
     don't want to delete from it) 2) it would be written before the CREATE
-    TABLE, which is a wrong order. So we keep binary logging disabled.
+    TABLE, which is a wrong order. So we keep binary logging disabled when we
+    open_table().
   */
-  if (!(table=open_table(thd,db,name,name,(bool*) 0)))
+  tmp_disable_binlog(thd);
+  if (!mysql_create_table(thd,db,name,create_info,*extra_fields,*keys,0))
   {
+    if (!(table=open_table(thd,db,name,name,(bool*) 0)))
       quick_rm_table(create_info->db_type,db,table_case_name(create_info,name));
-    DBUG_RETURN(0);
   }
+  reenable_binlog(thd);
+  if (!table)
+    DBUG_RETURN(0);
   table->reginfo.lock_type=TL_WRITE;
   if (!((*lock)=mysql_lock_tables(thd,&table,1)))
   {
@@ -1925,14 +1936,12 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
   else
     create_info->data_file_name=create_info->index_file_name=0;
   {
-    /*
+    /* We don't log the statement, it will be logged later. */
-      We don't log the statement, it will be logged later. Using a block so
+    tmp_disable_binlog(thd);
-      that disable_binlog is deleted when we leave it in either way.
+    int error= mysql_create_table(thd, new_db, tmp_name,
-    */
+                                  create_info,create_list,key_list,1);
-    Disable_binlog disable_binlog(thd);
+    reenable_binlog(thd);
-    if ((error=mysql_create_table(thd, new_db, tmp_name,
+    if (error)
-                                  create_info,
-                                  create_list,key_list,1)))
       DBUG_RETURN(error);
   }
   if (table->tmp_table)