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Re: [Qemu-block] [PATCH for-2.10] block: Skip implicit nodes in query-bl

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH for-2.10] block: Skip implicit nodes in query-block/blockstats
Date: Wed, 19 Jul 2017 11:41:42 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

[ Cc: qemu-stable ]

Am 19.07.2017 um 11:21 hat Manos Pitsidianakis geschrieben:
> On Wed, Jul 19, 2017 at 10:44:47AM +0200, Kevin Wolf wrote:
> >Commits 0db832f and 6cdbceb introduced the automatic insertion of filter
> >nodes above the top layer of mirror and commit block jobs. The
> >assumption made there was that since libvirt doesn't do node-level
> >management of the block layer yet, it shouldn't be affected by added
> >nodes.
> >
> >This is true as far as commands issued by libvirt are concerned. It only
> >uses BlockBackend names to address nodes, so any operations it performs
> >still operate on the root of the tree as intended.
> >
> >However, the assumption breaks down when you consider query commands,
> >which return data for the wrong node now. These commands also return
> >information on some child nodes (bs->file and/or bs->backing), which
> >libvirt does make use of, and which refer to the wrong nodes, too.
> >
> >One of the consequences is that oVirt gets wrong information about the
> >image size and stops the VM in response as long as a mirror or commit
> >job is running:
> >
> >https://bugzilla.redhat.com/show_bug.cgi?id=1470634
> >
> >This patch fixes the problem by hiding the implict nodes created
> s/implict/implicit


> Also, it seems like qemu-stable wasn't successfully CC'd (the patch
> is not in the list archives either).

Ah yes, forgot to actually CC it on the mail. Adding it to this mail.

> Reviewed-by: Manos Pitsidianakis <address@hidden>



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