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Re: [Qemu-block] [PATCH 21/22] specs/qcow2: fix bitmap granularity qemu-
Re: [Qemu-block] [PATCH 21/22] specs/qcow2: fix bitmap granularity qemu-specific note
Fri, 7 Oct 2016 15:18:30 -0500
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On 09/30/2016 05:53 AM, Vladimir Sementsov-Ogievskiy wrote:
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> docs/specs/qcow2.txt | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
> diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
> index 80cdfd0..d3e292f 100644
> --- a/docs/specs/qcow2.txt
> +++ b/docs/specs/qcow2.txt
> @@ -472,8 +472,7 @@ Structure of a bitmap directory entry:
> 17: granularity_bits
> Granularity bits. Valid values: 0 - 63.
Can we really theoretically go as low as 0, or are we constrained by the
fact that cluster_bits must be at least 9?
> - Note: Qemu currently doesn't support granularity_bits
> - greater than 31.
> + Note: Qemu currently support only values 9 - 31.
> Granularity is calculated as
> granularity = 1 << granularity_bits
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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