From owner-freebsd-hackers Thu Nov 27 00:22:01 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id AAA08621 for hackers-outgoing; Thu, 27 Nov 1997 00:22:01 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id AAA08614 for ; Thu, 27 Nov 1997 00:21:55 -0800 (PST) (envelope-from j@uriah.heep.sax.de) Received: (from uucp@localhost) by sax.sax.de (8.8.8/8.8.8) with UUCP id JAA07384; Thu, 27 Nov 1997 09:21:46 +0100 (CET) (envelope-from j@uriah.heep.sax.de) Received: (from j@localhost) by uriah.heep.sax.de (8.8.8/8.8.5) id IAA00457; Thu, 27 Nov 1997 08:57:17 +0100 (MET) Message-ID: <19971127085717.19775@uriah.heep.sax.de> Date: Thu, 27 Nov 1997 08:57:17 +0100 From: J Wunsch To: hackers@FreeBSD.ORG Cc: "Brian J. McGovern" Subject: Re: Union and Portal FSs Reply-To: Joerg Wunsch References: <199711262012.PAA02709@spoon.beta.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.88 In-Reply-To: <199711262012.PAA02709@spoon.beta.com>; from Brian J. McGovern on Wed, Nov 26, 1997 at 03:12:48PM -0500 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Brian J. McGovern wrote: > Just out of curiousity, how "decayed" are the Union and Portal > filesystems,and, more importantly, is anyone working on them? Kazu did quite some work on unionfs, and i think it's basically usable these days. There are still some odds in it (which i'm not sure of whether they can be easily resolved), like an open attempt with write intent will yield an EROFS if the lower layer is a read/only filesystem. UFS union mounts ("mount -o union /dev/fd0 /somewhere") seem to have a different set of problems. I've got this one basically to work, in an attempt to mount a writable floppy over a read/only CD-ROM /etc, but when i recently tried under -current with a lower-layer NFS, the writes went through into the lower layer, ick. :( No idea on portals... -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)