On Sun, Aug 05, 2007 at 01:06:58AM -0700, Daniel Phillips (phillips@phunq.net) wrote:

quoted

DST original code worked as device mapper plugin too, but its two
additional allocations (io and clone) per block request ended up for
me as a show stopper.

Ah, sorry, I misread.  A show stopper in terms of efficiency, or in 
terms of deadlock?

At least as in terms of efficiency. Device mapper lives in happy world
where memory does not end and allocations are fast.

-- 
	Evgeniy Polyakov