Re: [Xen-devel] Re: [PATCH 0 of 6] dm-userspace xen integrationpatches

[Dan Smith <danms@xxxxxxxxxx>]

IP> What data structure / format are you using for storing the CoW
IP> data?

Currently, I've got a really simple format that just forms an identity
mapping by using a bitmap.  The first block (or blocks) on the
destination is reserved for metadata.  After that, if bit X is set,
then block X is located in block X+1 in the cow space.  It's fast, it
doesn't waste space, and it's easy to predict a mapping and flush it
later to avoid metadata reservations.

-- 
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@xxxxxxxxxx

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