linux-ext4 - Re: Unused block group, but all blocks not free?

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Date:	Sat, 23 May 2015 11:39:52 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	Theodore Ts'o <tytso@....edu>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Unused block group, but all blocks not free?

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On 05/22/2015 11:05 PM, Theodore Ts'o wrote:
> We didn't check e2defrag because I didn't realize you had
> ressurected it.  (At least when I last looked at it, I was too
> scared about its error handling, etc., and so I had deliberately
> declined to try to get it into e2fsprogs as something I wasn't
> willing to support it.  So you are a braver person than I....)

Of course... I rescued it a few years ago after debian removed it (
before e4defrag was around ) and got it fixed up to work on modern
filesystems and it's hosted at launchpad.net/e2defrag.  I break it out
every now and again for performance testing since it does a full
defrag rather than only files ( maximize large free extents ) and the
ability to pack files in a specified order, such as the order they are
read during boot.  Well, that and I still find the ANSI block map just
as fun to watch as when I first used it in the '90s on a 486 with 2mb
of ram ;)

I really like the algorithm you guys came up with back then for moving
blocks from where they are to their optimal position in mostly large
sequential chunks and without having to move them more than once.
Yea, it's not crash resilient, but it is FAST.

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