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


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 2/8] block: add basic backup support to block driver
Date: Tue, 21 May 2013 17:35:37 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 21/05/2013 17:25, Dietmar Maurer ha scritto:
>> Hmm, right.  But do we need the bitmap at all?  We can just use
>> > bdrv_is_allocated like bdrv_co_do_readv does.
> If a write occur, we read and backup that cluster immediately (out of order). 
> So
> I am quite sure we need the bitmap.

This is the same as how copy-on-read happens during image streaming, and
it doesn't use a bitmap.

Paolo



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