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

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Date:	Thu, 5 Aug 2010 21:29:27 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Karel Zak <kzak@...hat.com>, Tejun Heo <tj@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>, Jan Blunck <jblunck@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH v3 3/3] init: add support for root devices specified by 
	partition UUID

On Wed, Aug 4, 2010 at 20:22, Will Drewry <wad@...omium.org> 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.  Device
> 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:
>
>  root=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.

Kay
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