From owner-freebsd-fs@FreeBSD.ORG Wed Apr 20 21:45:59 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8DCC8106564A; Wed, 20 Apr 2011 21:45:59 +0000 (UTC) (envelope-from rmacklem@uoguelph.ca) Received: from esa-annu.mail.uoguelph.ca (esa-annu.mail.uoguelph.ca [131.104.91.36]) by mx1.freebsd.org (Postfix) with ESMTP id 3D58E8FC19; Wed, 20 Apr 2011 21:45:58 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApwEANRTr02DaFvO/2dsb2JhbACEUaFuiG+tIpESgSmDTnoEjiI X-IronPort-AV: E=Sophos;i="4.64,247,1301889600"; d="scan'208";a="118157473" Received: from erie.cs.uoguelph.ca (HELO zcs3.mail.uoguelph.ca) ([131.104.91.206]) by esa-annu-pri.mail.uoguelph.ca with ESMTP; 20 Apr 2011 17:45:58 -0400 Received: from zcs3.mail.uoguelph.ca (localhost.localdomain [127.0.0.1]) by zcs3.mail.uoguelph.ca (Postfix) with ESMTP id 5A05292127; Wed, 20 Apr 2011 17:45:58 -0400 (EDT) Date: Wed, 20 Apr 2011 17:45:58 -0400 (EDT) From: Rick Macklem To: Pawel Jakub Dawidek Message-ID: <1319015176.378941.1303335958312.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <20110420185347.GH1907@garage.freebsd.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [172.17.91.201] X-Mailer: Zimbra 6.0.10_GA_2692 (ZimbraWebClient - IE7 (Win)/6.0.10_GA_2692) Cc: freebsd-fs@freebsd.org Subject: Re: question on extended attributes X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Apr 2011 21:45:59 -0000 > On Fri, Apr 15, 2011 at 08:19:36PM -0400, Rick Macklem wrote: > > I don't believe that resource forks are available under FreeBSD at > > this > > time. Solaris supports the "subfile" concept, which is basically the > > same > > as far as I know, so it seems there might be something inside ZFS, > > although > > I suspect it isn't available for FreeBSD? > > > > Does anyone familiar with ZFS know more? > > ZFS in FreeBSD supports extended attributes based on Solaris resource > forks code. Take a look at the zfs_create_attrname() function in > sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c to see how > we > convert the names, etc. > Hmm. NFSv4 supports the resource forks model, too. (They called them named attributes.) I suppose that there would have to be some new VOPs though. For example, the NFSv4 server needs to be able to get all the attribute names, so it can generate a reply to the client (in that ugly readdir xdr format) and I don't think there's a way in the current VFS to ask "give me all the extended attribute names", is there? Might be worth looking at someday, rick ps: I know. Slightly off topic.