Re: fdisk: add GPT partition types for plain dm-crypt and LUKS

[Phillip Susi <psusi@ubuntu.com>]

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On 01/28/2014 04:09 PM, Christoph Anton Mitterer wrote:
> - for plain dm-crypt it's a "good" way to make it recognisable

Or use LUKS instead.

> - partitioning tools can use it to hint what a partition contains

The problem with hints is that they often tend to be wrong, which is
why Linux ignores them and goes straight to looking at what is in the
partition.

> - and after all, partition types do exist, whether they make sense
> and are used or not... and I think it's better to have some
> standardised value which people may set (if they want) even if it's
> nowhere used,.. instead of having them set something which may
> actually cause issues even if only in the future.

If it isn't used then why have it?  All it does is add confusion.

>> Linux doesn't use partition IDs.
> Phew... that's not fully true... not even for the kernel which I
> think still contains the code to do MD auto assembly with 0.9
> superblocks when some MBR partition type is set...

That's the exception and is depreciated/legacy behavior from the days
before initrd/initramfs.

> And there are probably many tools (fdisk ;-) ) out there which some
> how use or at least display the types.

Displaying useless esoteric information is useless and esoteric ;)

>> Also isn't plain dm-crypt depreciated?
> Why should it be?

For all of the reasons that LUKS was created.  In particular, the lack
of the ability to identify the thing.


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