On Wed August 3 2005 13:03, Michael J Wenk wrote: > On Wed, Aug 03, 2005 at 12:44:52PM -0700, Richard Harke wrote: > > Using loopback and cryptsetup (which uses the device mapper) > > I created an encrypted file system about the size of a CDRom. I put > > some files into this file system then I burned a CD using cdrecord. > > No error indications so far. Now I want to read the CD to verify > > whats on it. When I do a cryptsetup, I get an error. The command is > > > > cryptsetup create --size=1431552 aname /dev/cdrom > > > > The error I get is Invalid argument to an ioctl call. The ioctl call > > is trying to load the table to the mapper device. I ran strace but > > didn't get any more info. I've looked at the source but so far > > I haven't figured it out. > > > > Does any one out there have any ideas? > > > > Richard Harke > > _______________________________________________ > > All I have is a possible workaround. > > dd if=/dev/cdrom of=tmp.iso bs=64k > > > Then run the cryptsetup on the iso file. > > More than likely(this is just a stab btw, I am not completely sure of > what I am talking about and I am going off of memory of how the ioctl's > interface with the driver on linux) what's happening is the ioctl called > by the command is not valid with the device in question. If you make > the device into a file and then try it with the file, it *may* work. > > Mike That does work. I used dd, then losetup, cryptsetup and finally mount. I need to use losetup first because cryptsetup works on a device, not a file. As long as I have lots of hard disk space, I guess I could just keep the encrypted file-system images on the hard drive and just write to CD for backup.
I'm still a little curious though as I know the ioctl was to the just created device-mapper device and it certainly needs a table load to function. Richard _______________________________________________ vox-tech mailing list [email protected] http://lists.lugod.org/mailman/listinfo/vox-tech
