Many files:

  Backporting character_set_filesystem from 5.0 to 5.1.

mysql-test/r/variables.result

@@ -566,3 +566,21 @@ set global character_set_system = latin1;
 ERROR HY000: Variable 'character_set_system' is a read only variable
 set @@global.version_compile_os='234';
 ERROR HY000: Variable 'version_compile_os' is a read only variable
+set character_set_filesystem=latin1;
+select @@character_set_filesystem;
+@@character_set_filesystem
+latin1
+set @@global.character_set_filesystem=latin2;
+set character_set_filesystem=latin1;
+select @@character_set_filesystem;
+@@character_set_filesystem
+latin1
+set @@global.character_set_filesystem=latin2;
+set character_set_filesystem=default;
+select @@character_set_filesystem;
+@@character_set_filesystem
+latin2
+set @@global.character_set_filesystem=default;
+select @@global.character_set_filesystem;
+@@global.character_set_filesystem
+binary

mysql-test/t/variables.test

@@ -456,4 +456,18 @@ set global character_set_system = latin1;
 --error 1238
 set @@global.version_compile_os='234';
 
+#
+# Check character_set_filesystem variable
+#
+set character_set_filesystem=latin1;
+select @@character_set_filesystem;
+set @@global.character_set_filesystem=latin2;
+set character_set_filesystem=latin1;
+select @@character_set_filesystem;
+set @@global.character_set_filesystem=latin2;
+set character_set_filesystem=default;
+select @@character_set_filesystem;
+set @@global.character_set_filesystem=default;
+select @@global.character_set_filesystem;
+
 # End of 5.0 tests

sql/mysqld.cc

@@ -321,6 +321,7 @@ static const char *sql_mode_str= "OFF";
 static char *mysqld_user, *mysqld_chroot, *log_error_file_ptr;
 static char *opt_init_slave, *language_ptr, *opt_init_connect;
 static char *default_character_set_name;
+static char *character_set_filesystem_name;
 static char *my_bind_addr_str;
 static char *default_collation_name;
 static char mysql_data_home_buff[2];
@@ -469,6 +470,7 @@ MY_BITMAP temp_pool;
 
 CHARSET_INFO *system_charset_info, *files_charset_info ;
 CHARSET_INFO *national_charset_info, *table_alias_charset;
+CHARSET_INFO *character_set_filesystem;
 
 SHOW_COMP_OPTION have_berkeley_db, have_innodb, have_isam, have_ndbcluster, 
   have_example_db, have_archive_db, have_csv_db;
@@ -2677,6 +2679,12 @@ static int init_common_variables(const char *conf_file_name, int argc,
   global_system_variables.character_set_client= default_charset_info;
   global_system_variables.collation_connection= default_charset_info;
 
+  if (!(character_set_filesystem= 
+        get_charset_by_csname(character_set_filesystem_name,
+                              MY_CS_PRIMARY, MYF(MY_WME))))
+    return 1;
+  global_system_variables.character_set_filesystem= character_set_filesystem;
+
   sys_init_connect.value_length= 0;
   if ((sys_init_connect.value= opt_init_connect))
     sys_init_connect.value_length= strlen(opt_init_connect);
@@ -4563,6 +4571,7 @@ enum options_mysqld
   OPT_GROUP_CONCAT_MAX_LEN,
   OPT_DEFAULT_COLLATION,
   OPT_CHARACTER_SET_CLIENT_HANDSHAKE,
+  OPT_CHARACTER_SET_FILESYSTEM,
   OPT_INIT_CONNECT,
   OPT_INIT_SLAVE,
   OPT_SECURE_AUTH,
@@ -4671,6 +4680,11 @@ Disable with --skip-bdb (will save memory).",
    (gptr*) &opt_character_set_client_handshake,
    (gptr*) &opt_character_set_client_handshake,
     0, GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},
+  {"character-set-filesystem", OPT_CHARACTER_SET_FILESYSTEM,
+   "Set the filesystem character set.",
+   (gptr*) &character_set_filesystem_name,
+   (gptr*) &character_set_filesystem_name,
+   0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
   {"character-set-server", 'C', "Set the default character set.",
    (gptr*) &default_character_set_name, (gptr*) &default_character_set_name,
    0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
@@ -6260,6 +6274,7 @@ static void mysql_init_variables(void)
   files_charset_info= &my_charset_utf8_general_ci;
   national_charset_info= &my_charset_utf8_general_ci;
   table_alias_charset= &my_charset_bin;
+  character_set_filesystem= &my_charset_bin;
 
   opt_date_time_formats[0]= opt_date_time_formats[1]= opt_date_time_formats[2]= 0;
 
@@ -6320,6 +6335,7 @@ static void mysql_init_variables(void)
   default_character_set_name= (char*) MYSQL_DEFAULT_CHARSET_NAME;
   default_collation_name= (char*) MYSQL_DEFAULT_COLLATION_NAME;
   sys_charset_system.value= (char*) system_charset_info->csname;
+  character_set_filesystem_name= (char*) "binary";
 
 
   /* Set default values for some option variables */

sql/set_var.cc

@@ -148,6 +148,7 @@ sys_var_character_set_database	sys_character_set_database("character_set_databas
 sys_var_character_set_client  sys_character_set_client("character_set_client");
 sys_var_character_set_connection  sys_character_set_connection("character_set_connection");
 sys_var_character_set_results sys_character_set_results("character_set_results");
+sys_var_character_set_filesystem  sys_character_set_filesystem("character_set_filesystem");
 sys_var_thd_ulong	sys_completion_type("completion_type",
 					 &SV::completion_type,
 					 check_completion_type,
@@ -580,6 +581,7 @@ sys_var *sys_variables[]=
   &sys_character_set_client,
   &sys_character_set_connection,
   &sys_character_set_results,
+  &sys_character_set_filesystem,
   &sys_charset_system,
   &sys_collation_connection,
   &sys_collation_database,
@@ -771,6 +773,7 @@ struct show_var_st init_vars[]= {
   {sys_character_set_client.name,(char*) &sys_character_set_client, SHOW_SYS},
   {sys_character_set_connection.name,(char*) &sys_character_set_connection,SHOW_SYS},
   {sys_character_set_database.name, (char*) &sys_character_set_database,SHOW_SYS},
+  {sys_character_set_filesystem.name,(char*) &sys_character_set_filesystem, SHOW_SYS},
   {sys_character_set_results.name,(char*) &sys_character_set_results, SHOW_SYS},
   {sys_character_set_server.name, (char*) &sys_character_set_server,SHOW_SYS},
   {sys_charset_system.name,   (char*) &sys_charset_system,          SHOW_SYS},
@@ -2076,6 +2079,32 @@ void sys_var_character_set_client::set_default(THD *thd, enum_var_type type)
 }
 
 
+CHARSET_INFO **
+sys_var_character_set_filesystem::ci_ptr(THD *thd, enum_var_type type)
+{
+  if (type == OPT_GLOBAL)
+    return &global_system_variables.character_set_filesystem;
+  else
+    return &thd->variables.character_set_filesystem;
+}
+
+
+extern CHARSET_INFO *character_set_filesystem;
+
+void
+sys_var_character_set_filesystem::set_default(THD *thd, enum_var_type type)
+{
+ if (type == OPT_GLOBAL)
+   global_system_variables.character_set_filesystem= character_set_filesystem;
+ else
+ {
+   thd->variables.character_set_filesystem= (global_system_variables.
+					     character_set_filesystem);
+   thd->update_charset();
+ }
+}
+
+
 CHARSET_INFO **
 sys_var_character_set_results::ci_ptr(THD *thd, enum_var_type type)
 {

sql/set_var.h

@@ -540,6 +540,15 @@ class sys_var_character_set :public sys_var_thd
   virtual CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type)= 0;
 };
 
+class sys_var_character_set_filesystem :public sys_var_character_set
+{
+public:
+  sys_var_character_set_filesystem(const char *name_arg) :
+    sys_var_character_set(name_arg) {}
+  void set_default(THD *thd, enum_var_type type);
+  CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
+};
+
 class sys_var_character_set_client :public sys_var_character_set
 {
 public:

sql/sql_class.cc

@@ -648,6 +648,9 @@ void THD::update_charset()
   charset_is_collation_connection= 
     !String::needs_conversion(0,charset(),variables.collation_connection,
                               &not_used);
+  charset_is_character_set_filesystem= 
+    !String::needs_conversion(0, charset(),
+                              variables.character_set_filesystem, &not_used);
 }
 
 

sql/sql_class.h

@@ -569,6 +569,7 @@ struct system_variables
   my_bool old_passwords;
 
   /* Only charset part of these variables is sensible */
+  CHARSET_INFO  *character_set_filesystem;
   CHARSET_INFO  *character_set_client;
   CHARSET_INFO  *character_set_results;
 
@@ -1341,6 +1342,7 @@ class THD :public Statement,
   bool       query_error, bootstrap, cleanup_done;
   bool	     tmp_table_used;
   bool	     charset_is_system_charset, charset_is_collation_connection;
+  bool       charset_is_character_set_filesystem;
   bool       enable_slow_log;   /* enable slow log for current statement */
   bool	     no_trans_update, abort_on_warning;
   bool 	     got_warning;       /* Set on call to push_warning() */

sql/sql_yacc.yy

@@ -684,7 +684,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 	LEX_HOSTNAME ULONGLONG_NUM field_ident select_alias ident ident_or_text
         UNDERSCORE_CHARSET IDENT_sys TEXT_STRING_sys TEXT_STRING_literal
 	NCHAR_STRING opt_component key_cache_name
-        sp_opt_label BIN_NUM label_ident
+        sp_opt_label BIN_NUM label_ident TEXT_STRING_filesystem
 
 %type <lex_str_ptr>
 	opt_table_alias
@@ -5937,7 +5937,7 @@ select_var_ident:
            ;
 
 into:
-        INTO OUTFILE TEXT_STRING_sys
+        INTO OUTFILE TEXT_STRING_filesystem
 	{
           LEX *lex= Lex;
           lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
@@ -5946,7 +5946,7 @@ into:
             YYABORT;
 	}
 	opt_field_term opt_line_term
-	| INTO DUMPFILE TEXT_STRING_sys
+	| INTO DUMPFILE TEXT_STRING_filesystem
 	{
 	  LEX *lex=Lex;
 	  if (!lex->describe)
@@ -6930,7 +6930,7 @@ load:   LOAD DATA_SYM
         };
 
 load_data:
-	load_data_lock opt_local INFILE TEXT_STRING_sys
+	load_data_lock opt_local INFILE TEXT_STRING_filesystem
 	{
 	  LEX *lex=Lex;
 	  lex->sql_command= SQLCOM_LOAD;
@@ -7459,6 +7459,18 @@ TEXT_STRING_literal:
 	;
 
 
+TEXT_STRING_filesystem:
+	TEXT_STRING
+	{
+	  THD *thd= YYTHD;
+	  if (thd->charset_is_character_set_filesystem)
+	    $$= $1;
+	  else
+	    thd->convert_string(&$$, thd->variables.character_set_filesystem,
+				$1.str, $1.length, thd->charset());
+	}
+	;
+
 ident:
 	IDENT_sys	    { $$=$1; }
 	| keyword