enlarging snapshot volume automatically?

Hi, I am thinking of a possible way to enlarge the
snapshot automatically when there is no space for
copy-on-write operation.

I thought when the kernel fails to allocate more
space, following the same way when the user 
enlarges that snapshot volume manually.

But I am not sure if this is possible because the
low device-mapper level only cares for the target
type and mapping information. (as far as I know.)

If there is a good idea on how to automatically
allocate more space whenever needed, please
let me know. (Or if there is any restriction on doing
this, let me know also. :-))

If LVM can allocate more space to snapshot
without the user's manual operation, that would be
a very nice improvement.

Thanks very much....

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