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Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to Blo


From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat
Date: Mon, 14 Sep 2015 16:20:12 +0200
User-agent: Notmuch/0.13.2 (http://notmuchmail.org) Emacs/23.2.1 (i486-pc-linux-gnu)

On Mon 14 Sep 2015 10:45:55 AM CEST, Kevin Wolf wrote:

>> >>> So why do we need the new flag? Because "backing: ''" is ugly?
>>
>> Anyway, was this ever implemented? It seems that passing a string to
>> the 'backing' parameter is only specified in the JSON schema, but no
>> one actually uses that.
>> 
> I have a patch that actually allows passing a node-name reference as a
> string here. v1 was posted a few months ago; it just turned out that I
> need to kill bdrv_swap() before that can work because bdrv_swap()
> doesn't work with nodes that have a BlockBackend attached.

But there was no way to open a BDS without having a BlockBackend
attached, or was there? It's possible with Max's "BlockBackend and
media" series, that's why I am using it.

Berto



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