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Date:	Tue, 03 Jul 2007 10:57:57 -0500
From:	Eric Sandeen <>
To:	Karsten Hopp <>
CC:	Theodore Tso <>,,
Subject: Re: Patch to support LUKS UUIDs in libblkid

Karsten Hopp wrote:

> Thanks for applying the small patch !
> FYI:
> I've opened a bugzilla about your udev concerns to get some comments from our
> and the upstream maintainer at
> Kay Sievers from the udev team responded:
> #> That's nothing new. Guessing filesystems by magic bytes on the disk is by
> #> definition unsafe.
> #>
> #> _All_ filesystem formatters are required to wipe out _all_ existing signatures
> #> before applying a new signature. Even then, it's not entirely safe to probe, but
> #> we obviously have no alternatives.

We fought this for a while in xfs, trying to be sure we wipe out old fs
signatures at mkfs time.  It'd be nice to have a library to do such

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