Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751825AbWICBEK (ORCPT ); Sat, 2 Sep 2006 21:04:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751823AbWICBEK (ORCPT ); Sat, 2 Sep 2006 21:04:10 -0400 Received: from cs.columbia.edu ([128.59.16.20]:51612 "EHLO cs.columbia.edu") by vger.kernel.org with ESMTP id S1751822AbWICBEI (ORCPT ); Sat, 2 Sep 2006 21:04:08 -0400 Subject: Re: [PATCH 04/22][RFC] Unionfs: Common file operations From: Shaya Potter To: Trond Myklebust Cc: Josef Sipek , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, hch@infradead.org, akpm@osdl.org, viro@ftp.linux.org.uk In-Reply-To: <1157151440.5628.42.camel@localhost> References: <20060901013512.GA5788@fsl.cs.sunysb.edu> <20060901014138.GE5788@fsl.cs.sunysb.edu> <1157149200.5628.38.camel@localhost> <1157150161.4398.4.camel@localhost.localdomain> <1157151440.5628.42.camel@localhost> Content-Type: text/plain Date: Sat, 02 Sep 2006 21:03:22 -0400 Message-Id: <1157245402.4398.6.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.7.92 Content-Transfer-Encoding: 7bit X-PerlMx-Spam: Gauge=IIIIIII, Probability=7%, X-Seen-By filter2.cs.columbia.edu Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 988 Lines: 26 On Fri, 2006-09-01 at 18:57 -0400, Trond Myklebust wrote: > On Fri, 2006-09-01 at 18:36 -0400, Shaya Potter wrote: > > On Fri, 2006-09-01 at 18:20 -0400, Trond Myklebust wrote: > > > > > Race! You cannot open an underlying NFS file by name after it has been > > > looked up: you have no guarantee that it hasn't been renamed. > > > > In a unionfs case that's not an issue. Nothing else is allowed to use > > the backing store (i.e. the nfs fs) while unionfs is using it, so there > > shouldn't be a renaming issue. > > How are you enforcing that on the server? If I formatted a partition on a san w/ ext3, who would enforce that only one machine has access to it at a time? the administrator of the file system. -- VGER BF report: H 0 - 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/