Amit, Benny, thanks for your help!

So does that mean that there can only be at most one leaf in the chain at any 
moment? Do we also expect at least one leaf?

Fedor

----- Original Message -----
From: "Benny Zlotnik" <bzlot...@redhat.com>
To: "Fedor Gavrilov" <fgavr...@redhat.com>
Cc: "devel" <devel@ovirt.org>
Sent: Wednesday, February 19, 2020 8:50:00 AM
Subject: Re: [ovirt-devel] do we even handle volume metadata in the engine?

Whether a volume is a leaf can be easily computed since it's the last
volume in the chain, see[1]


[1] 
https://github.com/oVirt/ovirt-engine/blob/master/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/disk/image/ImagesHandler.java#L667

On Tue, Feb 18, 2020 at 5:14 PM Fedor Gavrilov <fgavr...@redhat.com> wrote:
>
> Hi,
>
> It seems I was able to get my setup working for NFS storage, thanks for your 
> advices!
>
> Now I'm afraid I am stuck again: what I need to do is to add validation for 
> volume metadata to a certain command (to be exact, that VOLTYPE is LEAF). But 
> I can't find examples of us dealing with this data in the engine part at all. 
> I understand this is in the end executed by VDSM, but nevertheless - in what 
> format are we even reading and writing volume metadata? Even class/method 
> name would be helpful.
>
> Thanks,
> Fedor
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