linux-ext4 - Re: Space Maps?

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Message-ID: <pan.2014.11.24.16.12.51@googlemail.com>
Date:	Mon, 24 Nov 2014 16:12:51 +0000 (UTC)
From:	Holger Hoffstätte 
	<holger.hoffstaette@...glemail.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: Space Maps?

On Mon, 24 Nov 2014 09:38:27 -0600, Eric Sandeen wrote:

> On 11/24/14 9:33 AM, Theodore Ts'o wrote:
>> On Mon, Nov 24, 2014 at 12:43:51PM +0000, Holger Hoffstätte wrote:
>>>
>>> Cleaning out some old research papers I came again across the proposal
>>> for "space maps" in ext4 [1]. What happened to that? Was it rejected
>>> due to too much risk or other technical reasons? The benefits sound
>>> appealing, so I was wondering if there's something fundamentally wrong
>>> with the suggested approach.
>> 
>> No one ever submitted patches.
> 
> Was just checking that too. I'm always mystified by the folks who take the
> time to write & submit & present papers, but don't submit patches.

Thanks - that's all very sad. The author has a homepage at
http://saurabh.io/ so maybe someone with a sufficiently large army of
lawyers can contact him? I couldn't find any code right now either.

As for the patents - I'm outside the US and the paper explicitly mentions
using Linux' built-in RBTrees instead of AVL and a few othe minor
differences to ZFS, mostly relating to persisting the maps.

Holger

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