Re: [libvirt] [PATCH 1/5] Add virDomainGetBlockInfo API to query disk sizing
On 04/27/2010 01:34 PM, Daniel P. Berrange wrote:
Some applications need to be able to query a guest's disk info,
even for paths not managed by the storage pool APIs. This adds
a very simple API to get this information, modelled on the
virStorageVolGetInfo API, but with an extra field 'physical'.
Normally 'physical' and 'allocation' will be identical, but
in the case of a qcow2-like file stored inside a block device
'physical' will give the block device size, while 'allocation'
will give the qcow2 image size
ACK, and thanks for the examples in the comments.
+ * - Fully allocated raw file in filesystem:
+ * * capacity, allocation, physical: All the same
Actually, might it be possible that allocation/physical might be
slightly higher than capacity, to account for inode overhead and
rounding up to block size? But I don't see the need to clutter this
documentation with that level of detail.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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