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From: Heinz Diehl <htd@fancy-poultry.org>
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Subject: Re: [dm-crypt] My sequence of failure
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On 04.09.2010, machiner wrote: 

> 1 - # cryptsetup luksOpen /dev/sdb1 backup
> 2 - # mkfs.ext3 /dev/mapper/backup
> 3 - # mount /dev/mapper/backup /mnt/backup

If the underlying filesystem before the ext3 format was ext2/ext3,
you maybe have a chance to "unformat" your partition, there are some tools
out there in the net. I never used one by myself, so your mileage may vary.

However, if your original fs was btrfs or xfs, you're hosed, and your data are
gone, forever.