udf: Always require NLS support

UDF needs to convert strings between OSTA CS0 charset and standard UTF8.
Currently we implement our own utf-16 <-> utf-8 translations which is
unnecessary code duplication. Always select NLS so that we can use
translation functions from there.
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/Kconfig

 config UDF_FS
 	tristate "UDF file system support"
 	select CRC_ITU_T
+	select NLS
 	help
 	  This is a file system used on some CD-ROMs and DVDs. Since the
 	  file system is supported by multiple operating systems and is more
@@ -13,8 +14,3 @@ config UDF_FS
 	  module will be called udf.
 
 	  If unsure, say N.
-
-config UDF_NLS
-	bool
-	default y
-	depends on (UDF_FS=m && NLS) || (UDF_FS=y && NLS=y)

fs/udf/super.c

@@ -572,7 +572,6 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 		case Opt_utf8:
 			uopt->flags |= (1 << UDF_FLAG_UTF8);
 			break;
-#ifdef CONFIG_UDF_NLS
 		case Opt_iocharset:
 			if (!remount) {
 				if (uopt->nls_map)
@@ -581,7 +580,6 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 				uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 			}
 			break;
-#endif
 		case Opt_uforget:
 			uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 			break;
@@ -2117,7 +2115,6 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 		udf_err(sb, "utf8 cannot be combined with iocharset\n");
 		goto parse_options_failure;
 	}
-#ifdef CONFIG_UDF_NLS
 	if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
 		uopt.nls_map = load_nls_default();
 		if (!uopt.nls_map)
@@ -2125,7 +2122,6 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 		else
 			udf_debug("Using default NLS map\n");
 	}
-#endif
 	if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
 		uopt.flags |= (1 << UDF_FLAG_UTF8);
 
@@ -2279,10 +2275,8 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 error_out:
 	iput(sbi->s_vat_inode);
 parse_options_failure:
-#ifdef CONFIG_UDF_NLS
 	if (uopt.nls_map)
 		unload_nls(uopt.nls_map);
-#endif
 	if (lvid_open)
 		udf_close_lvid(sb);
 	brelse(sbi->s_lvid_bh);
@@ -2332,10 +2326,8 @@ static void udf_put_super(struct super_block *sb)
 	sbi = UDF_SB(sb);
 
 	iput(sbi->s_vat_inode);
-#ifdef CONFIG_UDF_NLS
 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
 		unload_nls(sbi->s_nls_map);
-#endif
 	if (!sb_rdonly(sb))
 		udf_close_lvid(sb);
 	brelse(sbi->s_lvid_bh);