Am 26.04.2017 um 05:34 hat Fam Zheng geschrieben: > Signed-off-by: Fam Zheng <f...@redhat.com>
The commit message is a bit terse. :-) So I think this means that instead of opening the backing file of the backup (which is probably the active file of the VM) a second time, we instead take a reference on the existing node. Very good idea. In fact, my question is: How did this ever work? Did we just neglect to test this? The backup backing file will use stale qcow2 metadata when we continue to write to the source. Unless I'm missing something, I'd propose this for qemu-stable. Also, mirror with MIRROR_OPEN_BACKING_CHAIN probably has a similar problem with opening the images in the backing chain a second time. Kevin
