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Re: [Qemu-block] [RFC for-2.7 0/1] block/qapi: Add query-block-node-tree

From: Max Reitz
Subject: Re: [Qemu-block] [RFC for-2.7 0/1] block/qapi: Add query-block-node-tree
Date: Tue, 29 Mar 2016 17:56:43 +0200
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On 29.03.2016 17:51, Kevin Wolf wrote:
> Am 24.03.2016 um 20:07 hat Max Reitz geschrieben:
>> As I responded to:
>> - http://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg04464.html
>> - http://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg05680.html
>> I think a general solution for querying the block node tree would be
>> nice (I don't think we actually have one). The single patch in this
>> series implements such a command.
>> However, this is an RFC because I'm not sure whether we really want this
>> and thus I didn't want to write the necessary tests for something we may
>> be going to discard anyway.
> I think we do want to have a way to query the tree structure in QMP. The
> part that I'm so sure about is whether we want a recursive command or
> one that just covers the children of a single node. If we want the
> latter, just adding a children field (which maps role names to node
> names) to query-block might be enough.

Sounds fine in principle to me, but I'd like to add that I think we may
want to have a new command for querying a specific BDS. You don't get
much choice which nodes you query with query-block, and
query-named-block-nodes seems a bit bloated to me by now...

About the "mapping role names to node names" though; I suppose you mean
like { "file": "file-node", "backing": "other-qcow2-node" }. I'd have
loved to do that, but I couldn't imagine a way to represent that in the
QAPI schema.


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