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

To: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH 0 of 6] dm-userspace xen integrationpatches
From: Dan Smith <danms@xxxxxxxxxx>
Date: Tue, 29 Aug 2006 07:51:38 -0700
Cc: Dan Smith <danms@xxxxxxxxxx>, Julian Chesterfield <jac90@xxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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In-reply-to: <A95E2296287EAD4EB592B5DEEFCE0E9D5725AC@xxxxxxxxxxxxxxxxxxxxxxxxxxx> (Ian Pratt's message of "Tue, 29 Aug 2006 15:42:46 +0100")
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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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