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Re: [Qemu-devel] [PATCH] doc: Preallocation does not require writing zer
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PATCH] doc: Preallocation does not require writing zeroes |
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Date: |
Thu, 11 Jul 2019 08:34:56 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 |
On 7/11/19 8:29 AM, Max Reitz wrote:
> When preallocating an encrypted qcow2 image, it just lets the protocol
> driver write data and then does not mark the clusters as zero.
> Therefore, reading this image will yield effectively random data.
>
> As such, we have not fulfilled the promise of always writing zeroes when
> preallocating an image in a while. It seems that nobody has really
> cared, so change the documentation to conform to qemu's actual behavior.
>
> Signed-off-by: Max Reitz <address@hidden>
> ---
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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