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Re: [Qemu-block] [Qemu-devel] [PATCH for-2.10 0/2] Bug fixes from byte-b

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH for-2.10 0/2] Bug fixes from byte-based block status
Date: Mon, 24 Jul 2017 07:05:07 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

On 07/21/2017 01:32 PM, Eric Blake wrote:
> Series 2-4 of my byte-based conversion missed soft freeze, so they
> are now 2.11 material.  However, there are some bug fixes in those
> series that we should fix now in 2.10 (patch 1 from series two
> on dirty bitmaps, patch 2 extracted from "qcow2: Switch qcow2_measure()
> to byte-based iteration" from series three on block status).
> I don't know if it is worth enhancing iotest 178 to probe the size
> of a 2T image.  The test is simple, and fast when patched:
> $ qemu-img create -f qcow2 -o cluster_size=2M huge 2T
> $ time ./qemu-img measure -O qcow2 -f qcow2 huge
> required size: 335806464
> fully allocated size: 2199359062016
> real  0m0.021s
> user  0m0.017s
> sys   0m0.004s
> but the inf-loop when unpatched is annoying; meanwhile, 'huge' only
> occupies 6 megabytes on disk, so it's not that invasive.
> Eric Blake (2):
>   dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented
>   qcow2: Fix sector calculation in qcow2_measure()

Thanks; queued on my NBD branch:
git://repo.or.cz/qemu/ericb.git nbd

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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