a new way to hang 7.0

[Michael Butler]

Elliot Finley wrote:
> -L has been hanging systems ever since it existed.  Don't use it.

I've been using it since it was implemented on many different machines
and never had a real problem with it. I always had the expectation that
snap-shot creation would be disk-intensive, however, and that implies
that I don't demand anything else from the file-systems concerned during
that time.

Also a "guaranteed clean" source file-system is mandatory - checking
everything with 'fsck -y' after an inadvertent power-cycle is wise,

	Michael