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Libvirt native C API and daemons
9c7c4a4fc5
I am trying to use a qcow image with libvirt where the backing 'file' is a qemu-nbd server. Unfortunately virDomainDiskDefForeachPath() assumes that backingStore is always a real file so something like 'nbd:0:3333' is rejected because a file with that name cannot be accessed. Note that I am not worried about directly using nbd images. That would require a new disk type with XML markup, etc. I only want it to be permitted as a backingStore The following patch implements danpb's suggestion: > I think I'm inclined to push the logic for skipping NBD one stage higher. > I'd rather expect virStorageFileGetMetadata() to return all backing > stores, even if not files. The virDomainDiskDefForeachPath() method > should definitely ignore non-file backing stores though. > > So what I'm thinking is to extend the virStorageFileMetadata struct and > just add a 'bool isFile' field to it. Default this field to true, unless > you see the prefix of nbd: in which case set it to false. The > virDomainDiskDefForeachPath() method can then skip over any backing > store with isFile == false Signed-off-by: Adam Litke <agl@us.ibm.com> Cc: Daniel P. Berrange <berrange@redhat.com> |
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LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>