Re: howto dm-crypt dvd

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On Tue, Jun 29, 2010 at 10:32:24AM -0500, Richard Ray wrote:
> I want to store private documents on a dvd so I followed this prescription
>
> dd if=/dev/zero of=loop bs=1G count=2
> losetup /dev/loop0 loop
> cryptsetup --verbose --cipher "twofish-cbc-essiv:sha256" --key-size 256  
> --verify-passphrase luksFormat /dev/loop0
> cryptsetup luksOpen /dev/loop0 loop
> mke2fs -m0 -j /dev/mapper/loop
> mount -t ext3 -o rw,defaults /dev/mapper/loop ~/mnt1
> cp -Rpv doc/ mnt1/
> umount mnt1
> cryptsetup luksClose loop
> losetup -d /dev/loop0
> growisofs -dvd-compat -Z /dev/dvd=/video_1/loop
>
>
> This all completed without errors
> So then I
>
> cryptsetup luksOpen /dev/dvd dvd
> mount -t ext3 -o rw,defaults /dev/mapper/dvd ~/dvd

An "rw" mount for a DVD? No wonder you get problems.
The journal and other data updated (e.g. last-access time 
stamp updates) must have piled up in the filesystem buffer.

Umounting requires them to be flushed to disk, which cannto be
done due to non-writability.

Just use the following for mounting the mapped DVD:

  mount -t ext3 -o ro /dev/mapper/dvd ~/dvd

That should fix things.

Arno





> No problems with that
> I was able to read the documents on the dvd but there was a 30 second or  
> more delay
> The delay got longer the more documents I tried to read
> I descided to unmount the dvd but it would not unmount and locked the  
> computer so that I had to hard boot it
> Where might I have gone wrong
>
> kernel-PAE-2.6.32.11-99.fc12.i686
> cryptsetup-luks-1.1.0-0.4.fc12.i686
>
> Richard Ray
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@xxxxxxxx
> http://www.saout.de/mailman/listinfo/dm-crypt
>

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 
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