linux-kernel - Re: [PATCH] Sanitize filesystem NLS handling

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Date:	Mon, 19 Mar 2007 07:01:28 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	"Alexander E. Patrakov" <patrakov@....usu.ru>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	agalakhov@...lrs.uran.ru, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH] Sanitize filesystem NLS handling

"Alexander E. Patrakov" <patrakov@....usu.ru> writes:

>  * Removes CONFIG_FAT_DEFAULT_IOCHARSET, now CONFIG_NLS_DEFAULT is used 
> for this purpose. This is because the correct setting of both must match 
> the user's locale

The some filesystems want to use utf-8, and others don't want to use
utf-8, no?  And is it also true about some devices using vfat?

>  * Merges the two CONFIG_SMB_NLS_REMOTE and CONFIG_FAT_DEFAULT_CODEPAGE 
> options into one, named CONFIG_CODEPAGE_DEFAULT. This is because the 
> correct setting of both must match the code page used by MS-DOS in the 
> user's country. For the same reason, CONFIG_SMB_NLS_DEFAULT is removed 
> (the only sane choice is "y")

No. Unfortunately the real is not simple like it in some case.

>  * Makes the FAT filesystem accept both the old-style "codepage=866" 
> mount option (which is inconsistent with other filesystems requiring a 
> codepage option) and the new-style "codepage=cp866" option. This is 
> necessary because CONFIG_CODEPAGE_DEFAULT must work for all filesystems 
> that use it

You allow to set any nls to codepage? If so, it is not good.

>  * Downgrades the UTF-8 FAT warning to a note, because, while using the 
> utf8 iocharset produces a case-sensitive FAT filesystem, other 
> iocharsets simply produce wrong characters, which is much worse

No, utf-8 makes completely wrong entry. It's more wrong than other nls.

>  * Makes CONFIG_NLS_DEFAULT and CONFIG_CODEPAGE_DEFAULT adjustable at 
> runtime via the following mechanisms:

The configurable sounds sane, and it may help some case. But, it should
not be system global. At least, I think the default would be per-filesystem,
otherwise some configs seems to be needed for other filesystem after all.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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