linux-ext4 - Re: [PATCH] e2fsck: Fix incorrect interior node logical start values

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Date:	Thu, 29 Nov 2012 08:22:53 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] e2fsck: Fix incorrect interior node logical start values

On Wed, Nov 28, 2012 at 11:49:16PM -0600, Eric Sandeen wrote:
> > 
> > Wow, that was unnecessarily large.  Here's a smaller one...
> > 
>
> Was that by hand-hackery or did you figure out how to hit
> it at runtime?

Via hand-hackery.  The tst_extents command allow you to do things like
this:

% ./build/lib/ext2fs/tst_extents  -w /tmp/test_case.img
tst_extents 1.42.6 (21-Sep-2012)
tst_extents:  inode <16>
header: magic=f30a entries=3 max=4 depth=1 generation=0
Loaded inode 16
tst_extents:  root
extent: lblk 0--83, len 84, pblk 1731, flags: (none)
tst_extents:  next_sibling
extent: lblk 84--4021, len 3938, pblk 1899, flags: (none)
tst_extents:  replace_node 80 0 1899
extent replace: 16 extent: lblk 80--79, len 0, pblk 1899, flags: (none)
extent: lblk 80--4021, len 3942, pblk 1899, flags: (none)
tst_extents:  prev_sibling
extent: lblk 0--79, len 80, pblk 1731, flags: 2ND_VISIT 
tst_extents:  q

						- Ted
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