Date: Mon, 18 Dec 2006 13:22:13 +0000 From: RW <fbsd06@mlists.homeunix.com> To: freebsd-geom@freebsd.org Subject: gconcat/gbde DVD encryption problem Message-ID: <200612181322.13560.fbsd06@mlists.homeunix.com>
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A couple of years ago, I created some DVDs encrypted with gdbe. I used 2 concatenated, file-backed md devices (to avoid the 2GB dvd file limit) and burned them to dvd. The resulting DVD was accessed like this: ---------------------------------------------------------- mount /dvdrw mdconfig -a -t vnode -f /dvdrw/d1 -u 31 mdconfig -a -t vnode -f /dvdrw/d2 -u 32 gconcat create datadvd /dev/md31 /dev/md32 gbde attach /dev/concat/datadvd mount -o ro /dev/concat/datadvd.bde /mnt/dvd ---------------------------------------------------------- The technique worked fine in February 2005, with whatever was the latest release, I haven't used the technique since then until a few days ago, but now I'm having a problem with FreeBSD 6.1. After the mdconfig I get "WARNING: opening backing store: /dvdrw/d1 readonly", which I doubt is the problem. The failure occurs here: # gbde attach /dev/concat/datadvd Enter passphrase: gbde: Attach to concat/datadvd failed: could not access consumer The same problem exists on a newly created disk, so it probably not corruption. And if I copy the two file to hard disk it works. It just seems to be a problem when they are on the DVD. Any ideas on how to fix this. I'm not particularly bothered about the existing disks, but I'd like to create some new ones.
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