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Re: [Qemu-devel] [PATCH v3 2/8] block: add basic backup support to block


From: Dietmar Maurer
Subject: Re: [Qemu-devel] [PATCH v3 2/8] block: add basic backup support to block driver
Date: Tue, 21 May 2013 16:15:34 +0000

> Copy-on-read modifies the topmost image even without changing the content,
> just like copy-before-write modifies the backup image.

Ah, got it. But this only works if you use a BS as target. This will not work 
with my
old backup driver patches (I am still not convinced about using a BS as backup 
target)




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