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Re: [RFC PATCH v3 07/27] qcow2: Add subcluster-related fields to BDRVQco

From: Eric Blake
Subject: Re: [RFC PATCH v3 07/27] qcow2: Add subcluster-related fields to BDRVQcow2State
Date: Thu, 20 Feb 2020 10:48:25 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/20/20 10:34 AM, Alberto Garcia wrote:
On Thu 20 Feb 2020 04:28:07 PM CET, Eric Blake wrote:
Images without subclusters are treated as if they had exactly one,
with subcluster_size = cluster_size.

The qcow2 spec changes earlier in the series made it sound like your
choices are exactly 1 or 32,


...but this name sounds like other values (2, 4, 8, 16) might be

I guess I didn't want to call it QCOW_SUBCLUSTERS_PER_CLUSTER because
there's already BDRVQcow2State.subclusters_per_cluster. And that one can
have two possible values (1 and 32) so 32 would be the maximum.

I get your point, however, and I'm open to suggestions.


since it is a hard-coded property of the EXTL2 feature.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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