linux-ext4 - Re: [PATCH] resize2fs: fix ENOSPC corruption case

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Message-ID: <4A11D491.4070809@redhat.com>
Date:	Mon, 18 May 2009 16:35:13 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] resize2fs: fix ENOSPC corruption case

Eric Sandeen wrote:
> http://people.redhat.com/esandeen/livecd-creator-imagefile.bz2
> contains an image (for now) which, when resized to 578639, corrupts
> the filesystem.
> 
> This is a bit crazy, I guess, because the fs currently has only
> 1 free block, but still, we should be graceful about the failure.
> Perhaps it would make sense to check the requested valuea against
> the minimum value resize2fs would compute for "-P" and fail (at
> least without a force).

heh, well, maybe not:

[root@...de e2fsprogs]# dumpe2fs -h /mnt/test/livecd-creator-imagefile |
grep "Block count"
dumpe2fs 1.41.5 (23-Apr-2009)
Block count:              578640
[root@...de e2fsprogs]# resize/resize2fs.static -P
/mnt/test/livecd-creator-imagefile
resize2fs 1.41.5 (23-Apr-2009)
Estimated minimum size of the filesystem: 9171138

The estimated minimum size is 16x the current size.

So much for that plan, at least without a bit more work.

-Eric
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