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Re: [Qemu-block] [PATCH v3 4/7] block/dirty-bitmaps: prohibit readonly b

From: Eric Blake
Subject: Re: [Qemu-block] [PATCH v3 4/7] block/dirty-bitmaps: prohibit readonly bitmaps for backups
Date: Fri, 1 Mar 2019 13:38:35 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0

On 3/1/19 1:15 PM, John Snow wrote:
> drive and blockdev backup cannot use readonly bitmaps, because the
> sync=incremental mechanism actually edits the bitmaps on success.
> If you really want to do this operation, use a copied bitmap.

In fact, that's what I ended up doing in my libvirt patches, always
running sync=incremental on a temporary copy.

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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