From: "J. Bruce Fields" Subject: Re: Delays on "first" access to a NFS mount Date: Thu, 8 Mar 2007 00:14:01 -0500 Message-ID: <20070308051401.GC15814@fieldses.org> References: <20070307194418.97fee0ec.simon.peter@gmx.de> <20070307205016.GI26553@fieldses.org> <20070307211729.GO26553@fieldses.org> <20070307215406.GR26553@fieldses.org> <17903.16030.26119.464793@notabene.brown> <20070307230601.GX26553@fieldses.org> <17903.19755.146916.321440@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Christoph Hellwig , nfs@lists.sourceforge.net, "Talpey, Thomas" , Simon Peter To: Neil Brown Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1HPAwQ-00034Y-Ha for nfs@lists.sourceforge.net; Wed, 07 Mar 2007 21:13:26 -0800 Received: from mail.fieldses.org ([66.93.2.214] helo=fieldses.org) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1HPAwR-0003nW-7G for nfs@lists.sourceforge.net; Wed, 07 Mar 2007 21:13:28 -0800 In-Reply-To: <17903.19755.146916.321440@notabene.brown> List-Id: "Discussion of NFS under Linux development, interoperability, and testing." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nfs-bounces@lists.sourceforge.net Errors-To: nfs-bounces@lists.sourceforge.net On Thu, Mar 08, 2007 at 10:39:23AM +1100, Neil Brown wrote: > Imagine having hundreds of filesystems on some sort of library (a CD > library?) where each can be identified by a UUID which gets stored in > the fsid in the filehandle. > Imagine a simple extension to mountd so that a call-out were made when > an unknown filehandle arrived. This callout could mount the required > filesystem and export it. Maybe the library only allows 3 filesystems > to be mounted at a time, so it would unmount the lease-recently-used > one. Maybe. Is this practical? Do we know of any cases of users doing this? Do you block forever if you try to access 4 filesystems at once? I dunno.... > I have often wanted to write a 'Linux commentary' that explains all > the hows and whys of things. I even started some bits once (to help > me understand the VFS layer). But Linux changes so fast that any > entry in such a commentary would be out-of-date before it was > written.... And there's a lot to document. I mean, look: http://www.oreilly.com/catalog/understandlni/ Just over a thousand pages, just covering the kernel networking code (and only some of it at that). Maybe they just lost the forest for the trees, but still, yipes. --b. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs