[pve-devel] qemu-server: allow clone from snapshot Patch V2

[Alexandre DERUMIER]

If it is allowed or not is another question. 

>>My question was if we can detect if a volume is in use ? 



I think we can find easily if a volume/snapshot is a parent of a cloned volume. 
It can be done fast for ceph,sheepdog,zfs. (1api call) 




for qcow2, it's a pain, because we need to parse all files with qemu-img info to find the parent relationship. 
But it's not a problem, as we can't clone from snapshot with files. 


>>(AFAIK we have such check for base volumes) 
Yes, indeed. 


	
Alexandre D e rumier 
Ingénieur Systèmes et Réseaux 

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----- Mail original -----

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Stefan Priebe" <s.priebe at profihost.ag>, pve-devel at pve.proxmox.com 
Envoyé: Mercredi 12 Février 2014 20:23:37 
Objet: Re: [pve-devel] qemu-server: allow clone from snapshot Patch V2 

> As this truly depends on storage backend - for example this is allowed for 
> sheepdog. Or do you just mean it must be a feature flag in the Storage Plugin? 

If it is allowed or not is another question. 

My question was if we can detect if a volume is in use (AFAIK we have such check for base volumes)? 

But this seems to be a minor issue (no blocker). 



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