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Re: [Qemu-block] [Qemu-devel] [PATCH 0/2] block: Fix qemu-img creating o

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 0/2] block: Fix qemu-img creating overlay when guest running
Date: Fri, 15 Dec 2017 13:51:29 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 12/15/2017 02:04 AM, Fam Zheng wrote:
> Shared write lock is not strictly necessary for creating the overlay image, if
> all what we want is to probe the size.

Theoretically, the size could be changing due to a resize operation.
But realistically, even if that happens, we will (hopefully) see either
the old size or the new size atomically (that is, I seriously doubt the
size information is split across multiple sectors of the in-use image to
the point that we could shard the read).

Reviewed-by: Eric Blake <address@hidden>

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

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