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Date:	Thu, 06 Jun 2013 22:40:37 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	David Jeffery <djeffery@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] e2fsck: detect invalid extents at the end of an extent-block

On 6/6/13 10:35 PM, Theodore Ts'o wrote:
> On Tue, Jun 04, 2013 at 02:53:51PM -0500, Eric Sandeen wrote:
>>
>> Here's an image which demonstrates this, current e2fsck does not detect
>> the error.
> 
> Thanks.  For future reference, here's how you can use debugfs to
> generate a much smaller image which demonstrates the problem, suitable
> for use in a regression test.

Ah.  Well, I did use debugfs to make it, but not quite so compactly.  :)

Thanks,
-Eric

> 					- Ted
> 
> #!/bin/sh
> dd if=/dev/zero of=image bs=1k count=256
> mke2fs -Ft ext4 image
> debugfs -w image << EOF
> write /dev/null testfile
> extent_open testfile
>   insert_node 0 15 100
>   insert_node --after 15 15 115
>   insert_node --after 30 15 130
>   insert_node --after 45 15 145
>   split
>   down
>   split
>   root
>   down
>   next
>   replace_node 15 30 200
>   extent_close
> set_inode_field testfile i_size 61400
> set_inode_field testfile i_blocks 154
> setb 100 15
> setb 130 30
> setb 200 30
> set_bg 0 free_blocks_count 156
> set_bg 0 bg_checksum calc
> set_super_value free_blocks_count 156
> EOF
> 
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