Re: [PATCH 2.6.27.y 2/3] ext4: Fix file fragmentation during largefile write.

[tytso]

On Fri, May 28, 2010 at 02:26:57PM -0500, Jayson R. King wrote:
> From: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> Date: Thu Oct 16 10:10:36 2008 -0400
> Subject: ext4: Fix file fragmentation during large file write.
> 
> commit 22208dedbd7626e5fc4339c417f8d24cc21f79d7 upstream.
> 
> The range_cyclic writeback mode uses the address_space writeback_index
> as the start index for writeback.  With delayed allocation we were
> updating writeback_index wrongly resulting in highly fragmented file.
> This patch reduces the number of extents reduced from 4000 to 27 for a
> 3GB file.

This isn't a critical bug fix either.  I don't really care a whole
lot, since I don't plan to support ext4 with all of these patches but
if you haven't been doing a full set of testing with these patches,
I'd be very concerned about whether ext4 would be stable after
applying this patch series.

What sort of testing _have_ you done?

						- Ted

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