linux-ext4 - Re: [e2fsprogs PATCH] Userspace solution to time-based UUID without duplicates

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Message-Id: <200712162253.20928.deller@gmx.de>
Date:	Sun, 16 Dec 2007 22:53:19 +0100
From:	Helge Deller <deller@....de>
To:	Theodore Tso <tytso@....edu>
Cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Theodore Tso <tytso@....edu>
Subject: Re: [e2fsprogs PATCH] Userspace solution to time-based UUID without duplicates

On Monday 10 December 2007, Theodore Tso wrote:
> On Tue, Nov 20, 2007 at 06:00:12PM -0500, Theodore Tso wrote:
> > Basically, the only way to solve this problem 100% in userspace would
> > be with a userspace daemon running as a privileged user, and some kind
> > of Unix domain socket.
> > 
> > Patches to implement this in the e2fsprogs UUID library would be
> > greatfully accepted.
> 
> This patch creates a userspace uuidd which correctly generates
> time-based (version 1) UUID's, with the clock sequence number stored
> in the filesystem so we correctly detect time going backwards across
> processes and even across reboots.
> 
> I believe this patch is a better solution than Helge's kernel patch
> solution or the kludgy patch to e2fsprogs in the the SLES RPM which
> tries to solve this problem in another way, but which has been
> problematic in the past.
> 
> Helge, could you try this out and see if it meets your needs?
> 
> (Ted's patch to e2fsprogs removed here)

FYI, we are currently discussing and testing this proposed patch to e2fsprogs off-list in Red Hat's bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=233471

Helge
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