Eric Blake 282fe1f08c snapshot: prevent stranding snapshot data on domain destruction ... Just as leaving managed save metadata behind can cause problems when creating a new domain that happens to collide with the name of the just-deleted domain, the same is true of leaving any snapshot metadata behind. For safety sake, extend the semantic change of commit b26a9fa9 to also cover snapshot metadata as a reason to reject undefining an inactive domain. A future patch will make sure that shutdown of a transient domain automatically deletes snapshot metadata (whether by destroy, shutdown, or guest-initiated action). Management apps of transient domains should take care to capture xml of snapshots, if it is necessary to recreate the snapshot metadata on a later transient domain with the same name and uuid. This also documents a new flag that hypervisors can choose to support as a shortcut for taking care of the metadata as part of the undefine process; however, nontrivial driver support for these flags will be deferred to future patches. Note that ESX and VBox can never be transient; therefore, they do not have to worry about automatic cleanup after shutdown (the persistent domain still remains); likewise they never store snapshot metadata, so the undefine flag is trivial. The nontrivial work remaining is thus in the qemu driver. * include/libvirt/libvirt.h.in (VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA): New flag. * src/libvirt.c (virDomainUndefine, virDomainUndefineFlags): Document new limitations and flag. * src/esx/esx_driver.c (esxDomainUndefineFlags): Trivial implementation. * src/vbox/vbox_tmpl.c (vboxDomainUndefineFlags): Likewise. * src/qemu/qemu_driver.c (qemuDomainUndefineFlags): Enforce the limitations.		2011-09-02 21:57:33 -06:00
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libvirt	snapshot: prevent stranding snapshot data on domain destruction	2011-09-02 21:57:33 -06:00
Makefile.am	maint: add missing copyright notices	2011-07-28 15:01:17 -06:00