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Re: [Qemu-block] [Qemu-devel] [PATCH] qcow2: fix image corruption after
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH] qcow2: fix image corruption after committing qcow2 image into base |
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Date: |
Fri, 10 Nov 2017 10:34:59 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 11/03/2017 09:41 AM, Daniel P. Berrange wrote:
> After committing the qcow2 image contents into the base image, qemu-img
> will call bdrv_make_empty to drop the payload in the layered image.
>
> When this is done for qcow2 images, it blows away the LUKS encryption
> header, making the resulting image unusable. There are two codepaths
> for emptying a qcow2 image, and the second (slower) codepaths leaves
> the LUKS header intact, so force use of that codepath.
>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>
> NB, ideally we would fix the faster codepath in make_completely_empty, but
> having looked at the code, I've really no idea how to even start on fixing
> that
> to not kill the LUKS header clusters.
Hmm - I wonder if persistent bitmaps are also corrupted in the fast path.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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