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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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