linux-ext4 - Re: ext2/3/4 online defrag

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Message-ID: <020201c792e4$86569b10$4168010a@bsd.tnes.nec.co.jp>
Date:	Thu, 10 May 2007 18:20:55 +0900
From:	"Takashi Sato" <sho@...s.nec.co.jp>
To:	"Eric" <erpo41@...il.com>
Cc:	<linux-ext4@...r.kernel.org>
Subject: Re: ext2/3/4 online defrag

Hi,

> I've searched the archives and googled around, and I've come to the
> following conclusions:
> *An offline defrag tool is available but dangerous.
> *Some patches exist that provide preliminary support for online defrag
> in the ext3 driver, but interest in improving/integrating these patches
> is low.
> *An implementation of an ext* filesystem driver can work with any
> ext2/3/4 filesystem as long as it supports the necessary revision
> (GOOD_OLD_REV or DYNAMIC_REV) and feature flags set in the filesystem.

I'm working on the development of online defrag for ext4.
The defrag can work effectively for fragmented huge files.
So I'm focussing on ext4 which can store many huge files and
developing the defrag for extent files on ext4.
Any comments are very welcome.

Takashi
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