From: Holger =?iso-8859-1?q?Hoffst=E4tte?= Subject: Re: Space Maps? Date: Mon, 24 Nov 2014 16:12:51 +0000 (UTC) Message-ID: References: <20141124153336.GA10992@thunk.org> <547350F3.4050208@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE To: linux-ext4@vger.kernel.org Return-path: Received: from plane.gmane.org ([80.91.229.3]:45187 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751758AbaKXQNG (ORCPT ); Mon, 24 Nov 2014 11:13:06 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XswG7-0000AY-MB for linux-ext4@vger.kernel.org; Mon, 24 Nov 2014 17:13:03 +0100 Received: from p4ff580e3.dip0.t-ipconnect.de ([79.245.128.227]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 24 Nov 2014 17:13:03 +0100 Received: from holger.hoffstaette by p4ff580e3.dip0.t-ipconnect.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 24 Nov 2014 17:13:03 +0100 Sender: linux-ext4-owner@vger.kernel.org List-ID: 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 Hoffst=C3=A4tte wro= te: >>> >>> Cleaning out some old research papers I came again across the propo= sal >>> for "space maps" in ext4 [1]. What happened to that? Was it rejecte= d >>> due to too much risk or other technical reasons? The benefits sound >>> appealing, so I was wondering if there's something fundamentally wr= ong >>> with the suggested approach. >>=20 >> No one ever submitted patches. >=20 > Was just checking that too. I'm always mystified by the folks who tak= e 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 mentio= ns using Linux' built-in RBTrees instead of AVL and a few othe minor differences to ZFS, mostly relating to persisting the maps. Holger -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html