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Michal Privoznik
6085d917d5
https://bugzilla.redhat.com/show_bug.cgi?id=1160084 As ofb6d4dad11b(1.2.5) we are trying to keep the status of FSFreeze in the guest. Even though I've tried to fixed couple of corner cases (6ea54769ba), it occurred to me just recently, that the approach is broken by design. Firstly, there are many other ways to talk to qemu-ga (even through libvirt) that filesystems can be thawed (e.g. qemu-agent-command) without libvirt noticing. Moreover, there are plenty of ways to thaw filesystems without even qemu-ga noticing (yes, qemu-ga keeps internal track of FSFreeze status). So, instead of keeping the track ourselves, or asking qemu-ga for stale state, it's the best to let qemu-ga deal with that (and possibly let guest kernel propagate an error). Moreover, there's one bug with the following approach, if fsfreeze command failed, we've executed fsthaw subsequently. So issuing domfsfreeze in virsh gave the following result: virsh # domfsfreeze gentoo Froze 1 filesystem(s) virsh # domfsfreeze gentoo error: Unable to freeze filesystems error: internal error: unable to execute QEMU agent command 'guest-fsfreeze-freeze': The command guest-fsfreeze-freeze has been disabled for this instance virsh # domfsfreeze gentoo Froze 1 filesystem(s) virsh # domfsfreeze gentoo error: Unable to freeze filesystems error: internal error: unable to execute QEMU agent command 'guest-fsfreeze-freeze': The command guest-fsfreeze-freeze has been disabled for this instance Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>