Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965353AbXAKKRY (ORCPT ); Thu, 11 Jan 2007 05:17:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965359AbXAKKRY (ORCPT ); Thu, 11 Jan 2007 05:17:24 -0500 Received: from mail.station1.mxsweep.com ([212.147.136.149]:2899 "EHLO blue.mxsweep.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965353AbXAKKRW (ORCPT ); Thu, 11 Jan 2007 05:17:22 -0500 X-Greylist: delayed 344 seconds by postgrey-1.27 at vger.kernel.org; Thu, 11 Jan 2007 05:17:22 EST Message-ID: <45A60C51.4050305@draigBrady.com> Date: Thu, 11 Jan 2007 10:07:13 +0000 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Thunderbird 1.5.0.8 (X11/20061116) MIME-Version: 1.0 To: Frank van Maarseveen CC: Steven Rostedt , Miklos Szeredi , pavel@ucw.cz, mikulas@artax.karlin.mff.cuni.cz, matthew@wil.cx, bhalevy@panasas.com, arjan@infradead.org, jaharkes@cs.cmu.edu, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, nfsv4@ietf.org Subject: Re: Finding hardlinks References: <20070105131235.GB4662@ucw.cz> <20070108112916.GB25857@elf.ucw.cz> <1168359985.7817.4.camel@localhost.localdomain> <20070109195310.GA10572@janus> In-Reply-To: <20070109195310.GA10572@janus> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Mlf-Version: 5.0.1.8359 X-Mlf-UniqueId: o200701111013060078008 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1464 Lines: 40 Frank van Maarseveen wrote: > On Tue, Jan 09, 2007 at 11:26:25AM -0500, Steven Rostedt wrote: >> On Mon, 2007-01-08 at 13:00 +0100, Miklos Szeredi wrote: >> >>>> 50% probability of false positive on 4G files seems like very ugly >>>> design problem to me. >>> 4 billion files, each with more than one link is pretty far fetched. >>> And anyway, filesystems can take steps to prevent collisions, as they >>> do currently for 32bit st_ino, without serious difficulties >>> apparently. >> Maybe not 4 billion files, but you can get a large number of >1 linked >> files, when you copy full directories with "cp -rl". > > Yes but "cp -rl" is typically done by _developers_ and they tend to > have a better understanding of this (uh, at least within linux context > I hope so). I'm not really following this thread, but that's wrong. A lot of people use hardlinks to provide snapshot functionality. I.E. the following can be used to efficiently make snapshots: rsync /src/ /backup/today cp -al /backup/today /backup/$Date See also: http://www.dirvish.org/ http://www.rsnapshot.org/ http://igmus.org/code/ > Also, just adding hard-links doesn't increase the number of inodes. I don't think that was the point. P?draig. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/