linux-ext4 - Re: [PATCH] ext4: Try to prepend extent to the existing one

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Message-ID: <20130401150111.GB4731@thunk.org>
Date:	Mon, 1 Apr 2013 11:01:11 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Try to prepend extent to the existing one

On Tue, Mar 19, 2013 at 02:13:38PM +0100, Lukas Czerner wrote:
> Currently when inserting extent in ext4_ext_insert_extent() we would
> only try to to see if we can append new extent to the found extent. If
> we can not, then we proceed with adding new extent into the extent tree,
> but then possibly merging it back again.
> 
> We can avoid this situation by trying to append and prepend new extent
> to the existing ones. However since the new extent can be on either
> sides of the existing extent, we have to pick the right extent to try to
> append/prepend to.
> 
> This patch adds the conditions to pick the right extent to
> append/prepend to and adds the actual prepending condition as well. This
> will also eliminate the need to use "reserved" block for possibly
> growing extent tree.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Thanks, added to the dev branch for testing.

					- Ted
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