Re: [PATCH v3 3/3] init: add support for root devices specified by partition UUID

From: Kay Sievers
Date: Thu Aug 05 2010 - 15:29:56 EST

On Wed, Aug 4, 2010 at 20:22, Will Drewry <wad@xxxxxxxxxxxx> wrote:
> This is the third patch in a series which adds support for
> storing partition metadata, optionally, off of the hd_struct.
> One major use for that data is being able to resolve partition
> by other identities than just the index on a block device. ÂDevice
> enumeration varies by platform and there's a benefit to being able
> to use something like EFI GPT's GUIDs to determine the correct
> block device and partition to mount as the root.
> This change adds that support to root= by adding support for
> the following syntax:
> Âroot=PARTUUID=hex-uuid

Just an update:

There is still no better idea than using this notation. We should
distinguish between filesystem and partiton UUIDs, and overloading
/dev with magic strings that will never exist there doesn't sound like
a good idea.

I checked with Karel, and fstab supports UUID=, initramfs tools
support root=UUID=, so we are probably going to have PARTUUID support
in fstab and initramfs too when we get there.

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