branches/zip: Initialize innodb_change_buffering from the configuration file.

So far, the parameter innodb_change_buffering was only settable by the
SET GLOBAL command. Any change specified in the configuration file or
on the mysqld command line was ignored. This was reported as Issue #217.

rb://109 approved by Heikki Tuuri.

ChangeLog

+2009-04-06	The InnoDB Team
+
+	* handler/ha_innodb.cc:
+	Make the parameter innodb_change_buffering settable by the
+	configuration file or mysqld command line options.  Before this
+	fix, the initial value specified for this parameter was ignored.
+
 2009-04-06	The InnoDB Team
 
 	* sync/sync0rw.c:

handler/ha_innodb.cc

@@ -2059,6 +2059,27 @@ innobase_init(
 		}
 	}
 
+	if (innobase_change_buffering) {
+		ulint	use;
+
+		for (use = 0;
+		     use < UT_ARR_SIZE(innobase_change_buffering_values);
+		     use++) {
+			if (!innobase_strcasecmp(
+				    innobase_change_buffering,
+				    innobase_change_buffering_values[use])) {
+				ibuf_use = (ibuf_use_t) use;
+				goto innobase_change_buffering_inited_ok;
+			}
+		}
+
+		sql_print_error("InnoDB: invalid value "
+				"innodb_file_format_check=%s",
+				innobase_change_buffering);
+		goto mem_free_and_error;
+	}
+
+innobase_change_buffering_inited_ok:
 	ut_a((ulint) ibuf_use < UT_ARR_SIZE(innobase_change_buffering_values));
 	innobase_change_buffering = (char*)
 		innobase_change_buffering_values[ibuf_use];