Re: [RFC] LUKS

Am Dienstag, 16. Mai 2006 13:07 schrieb Tobias Hintze:
> On Tue, May 16, 2006 at 09:30:24AM +0200, Benjamin Schieder wrote:
> > On 16.05.2006 09:15:32, Tobias Hintze wrote:
> > > On Sun, May 14, 2006 at 03:50:40PM +0200, Stefan Fiedler wrote:
> > > [...]
> > >
> > > > I like your proposal, the varying size of LUKS data per partition has
> > > > to be considered, though. So there would be non-encryptable
> > > > filesystems, encryptables (handled by dmsetup) and encrypted (handled
> > > > by luks). Since we'd have to support all three types anyway, users
> > > > should be able to choose if a new filesystem is encryptable, and
> > > > en-/decrypt filesystems in a separate step.
> > >
> > > i like the idea of the status "encryptable"
> > > and i think it is possible to convert a used non-encryptable
> > > disk/partition to an encryptable one if it is not completely full.
> > > (depends on the filesystem of course)
> >
> > This is true for all filesystems that have a "resize" command. Although
> > I'm not entirely sure of how to move a filesystem "forward" on a
> > partition.
> >
> > Example:
> > 	|123DATA---|
> >
> > Now we move the data forward with dd, this is the result:
> > 	|123123123|
>
> push(read(chunk_size))
> write(empty_space(chunk_size))
> while !EOF:
>     go_ahead(chunk_size)
>     CHUNK = read(chunk_size)
>     write(pop())
>     push(CHUNK)
>

This should work as long as the filesystem contains no absolute references to 
disc sectors. However from my experience resizing/moving partitions is 
usually cumbersome and only possible for a few combinations of partition 
types and filesystems (at least by the free partitioners I've tried).

Cheers,
	Stefan Fiedler

> th
> --
>
> > The data would have to be move forwards beginning at its end. I have no
> > idea how to do this. Any suggestions?
> >
> >
> > Greetings,
> > 	Benjamin
> > --
> > Benjamin 'blindCoder' Schieder
> > Registered Linux User #289529: http://counter.li.org
> > finger blindcoder-1k+CIuW/[email protected] | gpg --import
> > --
> > /lusr/bin/brain: received signal: SIGIDIOT
> >
> >
> >
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