linux-ext4 - Re: [PATCH e2fsprogs] Add ZFS detection to libblkid

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Date:	Mon, 6 Apr 2009 22:35:28 +0200
From:	Karel Zak <kzak@...hat.com>
To:	"Ricardo M. Correia" <Ricardo.M.Correia@....COM>
Cc:	Andreas Dilger <adilger@....COM>,
	Eric Sandeen <sandeen@...hat.com>,
	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH e2fsprogs] Add ZFS detection to libblkid

On Mon, Apr 06, 2009 at 08:22:38PM +0100, Ricardo M. Correia wrote:
> So I think you're (mostly) right - in theory, a correct implementation
> would have to search all the uberblock slots in all the 4 labels (2 at
> the beginning of the partition and 2 at the end), for a total of 512
> magic offsets, but this is not easy to do with libblkid because it only
> looks for the magic values at hard-coded offsets (as opposed to being
> able to implement a routine to look for a filesystem, which could use a
> simple "for" statement).

 Note that the new libblkid version (in util-linux-ng) could use a
 simple "for" statement (see ufs.c or *_raid.c), but the "magic value
 at hard-coded offset" is a better (cheaper) method.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
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