cowloop technology

[Simon 'corecode' Schubert]

Erik V. Smith wrote:
ATmission Linux has a very creative feature that would be a really nice 
addition to DragonFly.
Yes, seems nice.  Basically a union mount on the block layer.  There are 
some issues tho:

What do you do if the lower layer gets modified?
- while running
- while not running
We don't have a generic block device layering interface yet.  I'd like 
to have something like this before, then supporting cloop for instance 
would be nice as well.  I know some people don't like the 
implementation of GEOM, but I think the basic principle is needed 
anyways.  Some kind of generic layering abstraction for block devices.

cheers
  simon
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