linux-kernel - Re: A Plumber???s Wish List for Linux

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Message-ID: <20111014154725.GB13119@thunk.org>
Date:	Fri, 14 Oct 2011 11:47:25 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	dave@...os.cz, Hugo Mills <hugo-lkml@...fax.org.uk>,
	Kay Sievers <kay.sievers@...y.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, lennart@...ttering.net,
	harald@...hat.com, david@...ar.dk, greg@...ah.com,
	Chris Mason <chris.mason@...cle.com>,
	Btrfs mailing list <linux-btrfs@...r.kernel.org>
Subject: Re: A Plumber???s Wish List for Linux

On Thu, Oct 13, 2011 at 11:28:39AM +1100, Dave Chinner wrote:
> Yup. xfs_admin already provides an interface for offline
> modification of the UUID for XFS filesytems. I.e. clone the
> filesytem using xfs_copy, then run xfs_admin -U generate <clone> to
> generate a new uuid in the cloned copy before you mount the
> clone....

This is probably another thing which perhaps Ric Wheeler's proposed
"generic LVM / file system management front end" should abstract away,
since every single file system has a different way of setting the UUID
in an off-line way.  It's a relatively specialized feature, so I
wouldn't call it high priority to implement first.

	      	      	       	  - Ted
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