[libvirt] Question about fsfreeze/fsthaw API

Hi all, Is there any plans to add APIs to execute fsfreeze/fsthaw in qemu guests? (something like virDomainFSFreeze(domain,timeout,flags) and virDomainFSThaw(domain,timeout,flags)) These would be useful in the case a guest has a disk device with its own snapshot feature, such as cinder volumes in OpenStack configuration. In such cases, libvirt clients want to issue fsfreeze/fsthaw before/after taking the disk snapshot. Currently we can execute them using virDomainQemuAgentCommand(). (e.g. virsh qemu-agent-command dom '{"execute":"guest-fsfreeze-freeze"}' ) However, this is exposing internal implementation too much. And it cannot leverage future implementation for the other hypervisors. So it would be nice if we have well-defined API for fsfreeze/fsthaw. If there is no plan for these API and this is acceptable, I will try to implement this. Any comments are welcome. Thanks, Tomoki Sekiyama