linux-kernel - Re: [PATCHv2] fat: add config option to set UTF-8 mount option by default

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Date:	Wed, 23 Mar 2016 09:17:13 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jonathan Corbet <corbet@....net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2] fat: add config option to set UTF-8 mount option by default

On Tue, Mar 8, 2016 at 2:53 PM, Maciej S. Szmigiero
<mail@...iej.szmigiero.name> wrote:
> FAT has long supported its own default file name encoding
> config setting, separate from CONFIG_NLS_DEFAULT.
>
> However, if UTF-8 encoded file names are desired FAT
> character set should not be set to utf8 since this would
> make file names case sensitive even if case insensitive
> matching is requested.
> Instead, "utf8" mount options should be provided to enable
> UTF-8 file names in FAT file system.
>
> Unfortunately, there was no possibility to set the default
> value of this option so on UTF-8 system "utf8" mount option
> had to be added manually to most FAT mounts.
>
> This patch adds config option to set such default value.
>
> Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>

> --- a/fs/fat/Kconfig
> +++ b/fs/fat/Kconfig
> @@ -93,8 +93,24 @@ config FAT_DEFAULT_IOCHARSET
>           that most of your FAT filesystems use, and can be overridden
>           with the "iocharset" mount option for FAT filesystems.
>           Note that "utf8" is not recommended for FAT filesystems.
> -         If unsure, you shouldn't set "utf8" here.
> +         If unsure, you shouldn't set "utf8" here - select the next option
> +         instead if you would like to use UTF-8 encoded file names by default.
>           See <file:Documentation/filesystems/vfat.txt> for more information.
>
>           Enable any character sets you need in File Systems/Native Language
>           Support.
> +
> +config FAT_DEFAULT_UTF8
> +       bool "Enable FAT UTF-8 option by default"
> +       depends on VFAT_FS
> +       default n
> +       help
> +         Set this if you would like to have "utf8" mount option set
> +         by default when mounting FAT filesystems.
> +
> +         Even if you say Y here can always disable UTF-8 for
> +         particular mount by adding "utf8=0" to mount options.
> +
> +         Say Y if you use UTF-8 encoding for file names, N otherwise.
> +
> +         See <file:Documentation/filesystems/vfat.txt> for more information.

What's the recommended value of CONFIG_FAT_DEFAULT_UTF8 for
a (distro) defconfig?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds