linux-ext4 - Re: e2defrag 0.81 released

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Date:	Mon, 09 Jul 2012 14:49:51 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	Greg Freemyer <greg.freemyer@...il.com>
CC:	Andreas Dilger <adilger@...ger.ca>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: e2defrag 0.81 released

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On 7/9/2012 12:16 PM, Greg Freemyer wrote:
> Of course, even that is better than having to unmount the
> filesystem like you new tool apparently requires.

Old tool... very old tool ;)

I remember using the thing with one of the first releases of slackware
when I first started playing with Linux, and iirc, DOS hadn't yet
included its own defragger.

> I think you're right e4defrag userspace code ignores consolidating 
> freespace to make bigger extents possible and I don't think
> userspace has any file packing specific knowledge.
> 
> Does fallocate itself assist with either?
> 
> ie. since e4defrag uses fallocate to allocate the donor file
> blocks, logically it would make sense to add the intelligence you
> are looking for into fallocate.  And hopefully it is already
> there.

You need a method of requesting specific blocks instead of just asking
for the right number.  Then you need to analyze all of the files on
the disk to figure out where their blocks are, and decide where you
want them to be instead.  Then you could use the donor inode method to
move things around.

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