On 9/24/20 6:43 AM, Peter Krempa wrote:
To implement <transient/> disks we'll need to install an overlay on top of the original disk image which will be discarded after the VM is turned off. This was initially implemented by qemu but libvirt never picked up this option. With blockdev the qemu feature became unsupported
You may want to add mention that qemu's -transient command-line option lets qemu create the file, which fails under various SELinux scenarios (as one of the reasons why libvirt never used it).
so we need to do this via the snapshot code anyways. The helpers introduced in this patch prepare a fake snapshot disk definition for a disk which is configured as <transient/> and use it to create a snapshot (without actually modifying metada or persistent def).
metadata
Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> --- src/qemu/qemu_snapshot.c | 91 +++++++++++++++++++++++++++++++++++++++- src/qemu/qemu_snapshot.h | 5 +++ 2 files changed, 95 insertions(+), 1 deletion(-)
-- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
