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and subject line statfs returns wrong values for 250Gb FAT fs
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From: Carlos Rodrigues <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: kernel-image-2.6.8-2-386: statfs returns wrong values for FAT fs
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Date: Sat, 07 May 2005 18:24:29 +0100
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Package: kernel-image-2.6.8-2-386
Version: 2.6.8-13
Severity: important
I have a 250Gb external USB 2.0 hard-drive formatted with FAT32 and "df"
always reports 64Kb of used space on it, although it contains a couple of
gigabytes.
At first I thought the problem might be in "df" itself, but the following
test code proves the statfs function is to blame. The values returned are
incorrect.
However, it does report correct values for another FAT32 partition I have
(70Gb).
----------- statfs.c -----------
#include <sys/vfs.h>
int main(int argc, char *argv[])
{
struct statfs stats;
long used;
int kib;
if (argc < 2) {
printf("USAGE: %s <mountpoint>\n", argv[0]);
return 1;
}
statfs(argv[1], &stats);
used = stats.f_blocks - stats.f_bfree;
printf("f_bsize = %ld blocks\nf_blocks = %ld blocks\nf_bfree = %ld
blocks\nused = %ld blocks\n",
stats.f_bsize, stats.f_blocks, stats.f_bfree, used);
kib = stats.f_bsize / 1024;
printf("total = %ld KiB\nfree = %ld KiB\nused = %ld KiB\n",
kib * stats.f_blocks,
kib * stats.f_bfree,
kib * used);
return 0;
}
----------- eof - statfs.c -----------
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8-2-386
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages kernel-image-2.6.8-2-386 depends on:
ii coreutils [fileutils] 5.2.1-2 The GNU core utilities
ii initrd-tools 0.1.78 tools to create initrd image for p
ii module-init-tools 3.2-pre1-2 tools for managing Linux kernel mo
-- no debconf information
---------------------------------------
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Date: Wed, 11 May 2005 10:48:09 +0900
From: Horms <[EMAIL PROTECTED]>
To: Carlos Rodrigues <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Subject: Re: statfs returns wrong values for 250Gb FAT fs
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On Tue, May 10, 2005 at 09:34:46PM +0100, Carlos Rodrigues wrote:
> OGAWA Hirofumi wrote:
>
> >Filesystem may have the corrupted free-cluster value.
> >
> >I couldn't reproduce the problem on 2.6.12-rc4.
> >
> >Could you try a recently dosfsck (dosfstools-2.11 or later)?
> >Also could you send the output of above program?
> >
> >
>
> "dosfsck" did find a problem in the free-cluster value. And also said
> the backups FAT was different than the original FAT.
>
> I didn't use "dosfsck" to fix the problems though (not that it couldn't,
> I just didn't try). As I had already copied everything to another disk,
> I just used "mkdosfs" to reformat the drive, and it works just fine now.
>
> I still don't know what caused this, probably something related to some
> "kernel panics" I was seeing on shutdown (in a Fedora 3 installation,
> not Debian), after doing an umount+unplug.
>
> I didn't though of using "dosfsck" because Windows' checkdisk was saying
> the filesystem was perfectly fine... It makes me feel really safe
> trusting MS tools... not.
Glad to hear that worked, I am going to close this bug.
--
Horms
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