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@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org