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Date: Sun, 27 May 2007 01:25:02 +0200
From: Lars Kristiansen <lars+lister.freebsd@adventuras.no>
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Subject: Re: Restore UFS snapshot
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> 
> # umount
> # snap_rollback
> *wait 10 seconds*
> # mount
> 
> .. and I'm set.
> 
> I believe it should be possible. And if nothing like that exists, it
> should be made. I could look into it, but I would have to learn a
> lot more about the inner workings of the file system first.

related:
afaik, zfs rollback is working and is planned for freebsd 7.0.