On Fri, Apr 8, 2011 at 2:31 PM, Daniel P. Berrange <berrange@xxxxxxxxxx> wrote: I have CCed Anthony and Kevin. Anthony drove the QED image streaming and Kevin will probably be interested in the idea of allocating raw images as a background activity while QEMU runs. > /* > * @path: fully qualified filename of the virtual disk > * @nregions: filled in the number of @region structs > * @regions: filled with a list of allocated regions > * > * Query the extents of allocated regions within the > * virtual disk file. The offsets in the list of regions > * are not guarenteed to be sorted in any explicit order. > */ > int virDomainBlockGetAllocationMap(virDomainPtr dom, > const char *path, > unsigned int *nregions, > virDomainBlockRegionPtr *regions); QEMU can provide this with its existing .bdrv_is_allocated() function. Kevin, do you have any thoughts on whether this API will work well? > This takes care of things for running guests. It would be > desirable to have the same functionality available when a > guest is not running, via the virStorageVol APIs. Indeed, > this would allow access to the allocation functionality > for disks not explicitly associated with any VM yet. Today QEMU doesn't really cover the offline case although in the future it may be possible to have a qemu-img command that preallocates images and can be aborted. Stefan -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list