Open Stack

On 2013-10-11 10:50:33 -0600 (-0600), Chris Friesen wrote:
> Sounds like we could use some kind of layer that will zero out
> blocks on read if they haven't been written by that user.
[...]

You've mostly just described thin provisioning... reads to
previously unused blocks are returned empty/all-zero and don't get
allocated actual addresses on the underlying storage medium until
written.
-- 
Jeremy Stanley