On 12/16/2014 08:11 AM, Peter Krempa wrote: > On 12/16/14 09:04, Eric Blake wrote: >> This patch introduces access to allocation information about >> a backing chain of a live domain. While querying storage >> volumes for read-only disks could provide some of the details, >> there is one case where we have to rely on qemu: when doing >> a block commit into a backing file, where that file is stored >> in qcow2 format on a host block device, we want to know the >> current highest write offset into that image, in order to know >> if the disk must be resized larger. qemu-img does not >> (currently) show this information, and none of the earlier >> block APIs were extensible enough to expose it. But >> virDomainListGetStats is perfect for the job! >> >> * block device. >> + * "block.<num>.backingIndex" - unsigned int giving the <backingStore> index, >> + * when backing images are listed. > > You add the field to this help, but ... > >> -I<--block> returns: >> +I<--block> returns information about disks associated with each >> +domain. Using the I<--backing> flag extends this information to >> +cover all resources in the backing chain, rather than the default >> +of limiting information to the active layer for each guest disk. >> +Information listed includes: >> "block.count" - number of block devices on this domain, >> "block.<num>.name" - name of the target of the block device <num>, >> "block.<num>.path" - file source of block device <num>, if it is a >> > > ... not to the manpage. > > ACK with ^^. Fixed and pushed. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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