[linux-lvm] Feature Request (revert a logical volume to its snapshot)

[Joe Harvell]

I really love the snapshot logical volume feature, and I use it for 
making consistent backups of my system while it is running.

Recently, though I found myself wanting to use a snapshot logical volume 
to preserve the state of a filesystem while I experimented with 
changes.  When I needed to revert, I had to copy the contents from the 
snashot logical volume, destroy the snapshot and snapshot source, and 
then replace the snapshot source with the copy I made of the snapshot.

It seems like it would make sense for LVM to support a feature to revert 
the source logical volume to the state it was in when the snapshot was 
taken.  I read through all the man pages but I didn't see anything like 
this.  I realize it might not be possible to do this atomically while 
the source logical volume is active, but that's fine.  I would still 
like to be able to do it when the source is inactive.
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