Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030255AbXADW76 (ORCPT ); Thu, 4 Jan 2007 17:59:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030252AbXADW75 (ORCPT ); Thu, 4 Jan 2007 17:59:57 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:42889 "EHLO amd.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1030181AbXADW74 (ORCPT ); Thu, 4 Jan 2007 17:59:56 -0500 Date: Thu, 4 Jan 2007 23:59:29 +0100 From: Pavel Machek To: Miklos Szeredi Cc: matthew@wil.cx, bhalevy@panasas.com, arjan@infradead.org, mikulas@artax.karlin.mff.cuni.cz, jaharkes@cs.cmu.edu, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, nfsv4@ietf.org Subject: Re: Finding hardlinks Message-ID: <20070104225929.GC8243@elf.ucw.cz> References: <4593890C.8030207@panasas.com> <1167300352.3281.4183.camel@laptopd505.fenrus.org> <4593E1B7.6080408@panasas.com> <20070102191504.GA5276@ucw.cz> <20070103115632.GA3062@elf.ucw.cz> <20070103135455.GA24620@parisc-linux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1294 Lines: 29 Hi! > > > High probability is all you have. Cosmic radiation hitting your > > > computer will more likly cause problems, than colliding 64bit inode > > > numbers ;) > > > > Some of us have machines designed to cope with cosmic rays, and would be > > unimpressed with a decrease in reliability. > > With the suggested samefile() interface you'd get a failure with just > about 100% reliability for any application which needs to compare a > more than a few files. The fact is open files are _very_ expensive, > no wonder they are limited in various ways. > > What should 'tar' do when it runs out of open files, while searching > for hardlinks? Should it just give up? Then the samefile() interface > would be _less_ reliable than the st_ino one by a significant margin. You need at most two simultenaously open files for examining any number of hardlinks. So yes, you can make it reliable. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - 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/