Re: grubenv vs. diskfilter

[Phillip Susi]

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On 6/19/2013 2:31 AM, Andrey Borzenkov wrote:
>> I've been kicking around the thought that grub-pc should just
>> put grubenv in the embed area attached to the core img, and
>> grub-efi should put it in the ESP.
> 
> This still leaves the case when core.img cannot be embedded (and 
> adding extra space obviously increases chances of that) or
> delilberate blocklist installs (openSUSE defaults to booting from
> partition). And we still have PPC, SPARC and hopefully ARM to
> handle.

Blocklist installs already are unsupported and have plenty of
problems, including not working with diskfilter.  They should still be
able to work with grubenv in a regular file on a plain ext4 regular
disk partition.

As for embed size, there are really only two classes in practice: 2048
sector, which has plenty of room, and 63 sector, which already doesn't
fit for non trivial configurations including diskfilter.

> And we need some way for user space to auto-detect where
> environment block is located ...

Stick a pointer to the location in the grubenv file?

>> That would solve grubenv not working on btrfs too.
>> 
> 
> Does btrfs guarantee that bootloader area is always located on a 
> single physical device?

Not sure what you mean.


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