zfs discuss - Aug 2009 - ZFS clone destroyed by rollback of it''s parent filesystem... recoverable???

I created a clone from the most recent snapshot of a filesystem, the
clone''s parent filesystem was the same as the snapshot itself. When I
did a rollback to a previous snapshot it erased my clone. Yes it was really
stupid to keep the colne on the same filesystem, I was tired and wasn''t
thinking clearlt, new to this ZFS stuff. I did it in the web console gui,
otherwise I would propably have had chance to think twice before using "zfs
destroy -R ..." at command line.

Is there any way to recover a destroyed clone / snapshot. Is there any file
carving / recovery tools for ZFS?

below is extract from zfs history:

2009-08-05.07:55:30 zfs snapshot data/var-opt at screwed-01
2009-08-05.07:56:08 zfs clone data/var-opt at screwed-01
data/var-opt/screwed-01-clone
2009-08-05.07:56:40 zfs rollback -R -f data/var-opt at patches-03

I want either data/var-opt at screwed-01 or data/var-opt/screwed-01-clone

The boot environment saved me but ZFS snapshot/rollback cost me dearly, lost
emails from 16 July onwards.
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