linux-ext4 - Re: Difference in statvfs(2) block count with ext2 and very recent Linux 3.2.0 kernels

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Message-ID: <4EC3E5CF.6030805@redhat.com>
Date:	Wed, 16 Nov 2011 10:33:19 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Richard W.M. Jones" <rjones@...hat.com>
CC:	linux-ext4@...r.kernel.org, meyering@...hat.com
Subject: Re: Difference in statvfs(2) block count with ext2 and very recent
 Linux 3.2.0 kernels

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On 11/16/11 3:54 AM, Richard W.M. Jones wrote:
> 
> Hi,
> 
> We do some automated testing of the kernel and ext2/3/4 filesystems,
> and noticed that the block count returned by statvfs(2) for plain
> *ext2* filesystems has changed with the latest 3.2.0rc1 kernel.
> 
> This is probably just because of more accurate block accounting, but I
> just wanted to check that it isn't a bug.
> 
> This posting contains the numbers and a reproducer:
> 
>   https://www.redhat.com/archives/libguestfs/2011-November/msg00051.html
> 
> Rich.
> 

Note that it is a plain *ext2* filesystem run through the *ext4* driver,
in Fedora, and it was tracked down to commit f975d6bcc7a698a10cc755115e27d3612dcfe322
ext4: teach ext4_statfs() to deal with clusters if bigalloc is enabled
according to the above post...

I will try to look at this to see just why the change affects ext2, unless
Ted knows offhand.

- -Eric


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