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

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Message-Id: <1179465114.7891.17.camel@eric-laptop>
Date:	Thu, 17 May 2007 22:11:54 -0700
From:	Eric <erpo41@...il.com>
To:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: ext2/3/4 online defrag

On Thu, 2007-05-17 at 18:11 +0200, Jan Kara wrote:
> But me (and several other people
> independently as I've learnt recently) have written some tools which
> should result in something useful. If you're interested, you can join
> prefetch-devel@...glegroups.com - it's led by one guy who is doing
> defrag and stuff as his google summer of code project.

Is this different from the ext4/extent-based defrag patch that's been
mentioned on this list?

> > *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.
>   Not sure what you mean here...

The "ext2 filesystem"/"ext3 filesystem"/"ext4 filesystem" terminology
was confusing to me when I first started reading about them. In my mind,
it implied that those three filesystems were more different than they
actually are.

I think it would be more accurate to say that they are all essentially
the same filesystem, and that any filesystem driver that can mount a
given filesystem can mount any other ext2/3/4 filesystem of the same
revision with the same feature flags set.

I was asking for confirmation of this assumption, but I've since found a
lot of really good documentation that has cleared up a lot of things.

Thanks,

Eric

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