linux-kernel - Re: Wrong free clusters count on FAT32

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Message-ID: <87wt05vxu7.fsf@duaron.myhome.or.jp>
Date:	Sun, 22 Apr 2007 13:26:24 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Juergen Beisert <juergen127@...uzholzen.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Wrong free clusters count on FAT32

Andrew Morton <akpm@...ux-foundation.org> writes:

> On Sun, 22 Apr 2007 07:42:22 +0900 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> wrote:
>
>> Recent Windows doesn't update ->free_clusters correctly. The "nofree"
>> option ignores the ->free_clusters stored on FSINFO.
>
> It'd be better to avoid the new mount option if possible: fatfs is used by
> a *lot* of people who aren't particualrly expert, and we want to make things
> easy for them.

Ok.

> Is there some way in which we can work out what's happened and fix it up?

It seems that the recent Windows changed specification, and it's
undocumented. Windows doesn't update ->free_clusters correctly.

Probably, what we can do is to throw away speed of statfs(2) and not
using ->free_clusters. (And if possible, recover it by optimization.)

This patch doesn't use ->free_clusters by default. (instead, add
"usefree" for forcing to use it)
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>


View attachment "fat_dont-use_free_clusters-for-fat32.patch" of type "text/x-diff" (3251 bytes)