linux-kernel - Re: vfat32 Free Cluster Count Update

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Date:	Tue, 19 Feb 2008 19:23:12 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Gunter Ohrner <G.Ohrner@...t.rwth-aachen.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: vfat32 Free Cluster Count Update

Gunter Ohrner <G.Ohrner@...t.rwth-aachen.de> writes:

> Doesn't the Linux vfat driver update the FAT32's free cluster summary count?
>
> Zweiblum:~# dosfsck /dev/sda11
> dosfsck 2.11, 12 Mar 2005, FAT32, LFN
> /dev/sda11: 2451 files, 28218/1918827 clusters
>
> Zweiblum:~# mount /dev/sda11 /mnt/win_daten/
>
> Zweiblum:~# cp /etc/motd /mnt/win_daten/
>
> Zweiblum:~# umount /mnt/win_daten/
>
> Zweiblum:~# dosfsck /dev/sda11
> dosfsck 2.11, 12 Mar 2005, FAT32, LFN
> Free cluster summary wrong (1890609 vs. really 1890608)
> 1) Correct
> 2) Don't correct
> ? ^C

This problem was introduced by it ignores a free cluster count (not
"usefree"). If we was not using "usefree" option, FAT doesn't trust the
"free cluster count" anymore.

So, it doesn't update until re-count.  Um.. yes, it's a bit
problem. Ah.. it can fix "we can trust now"-flag or something.

I'll dig it more, later. And for right now, please run "df" command, it
will fix free cluster count.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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