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Date:	Tue, 06 Mar 2012 11:42:21 -0700
From:	Allison Henderson <>
To:	"Ted Ts'o" <>, Lukas Czerner <>,
	Ext4 Developers List <>
Subject: Re: [PATCH 1/1] ext4: Remove empty index blocks when punching holes

On 03/06/2012 11:37 AM, Allison Henderson wrote:
> On 03/06/2012 09:44 AM, Ted Ts'o wrote:
>> On Tue, Mar 06, 2012 at 08:11:37AM +0100, Lukas Czerner wrote:
>>> you're right my patches solves this problem (as I wrote in the commit
>>> description) just because we now use a different code paths, which do
>>> not have this problem.
>> Ok, thanks. I'll look at them before the end of this week.
>> Just to be clear, have the problematic code paths been removed in your
>> patches, or are they not just being used in the problem scenario?
>> Basically, is there any other time where we might need the additional
>> logic which Allison added?
>> - Ted
> Hi Ted,
> I think we will be ok with out this patch if we pick up Lukas's patches.
> Since the new implementation is seated inside ext4_ext_remove_space,
> Lukas can take advantage of the existing code there.
> In the current solution, we are seated inside map blocks, and then call
> ext4_ext_rm_leaf from there. The bug in the current solution was that we
> needed to free index blocks in the path to the extent we just removed,
> but ext4_ext_remove_space will do this as it walks over the tree.
> There are some things in the new implementation that Lukas and I are
> looking at, but once we get it straightened out, I think it will be ok
> to let this patch go. Thx!
> Allison Henderson

forgot to reply to all.  Resending to keep everyone posted :)

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