On Wed, 05/03 00:35, Fam Zheng wrote: > Opening the backing image for the second time is bad, especially here > when it is also in use as the active image as the source. The > drive-backup job itself doesn't read from target->backing for COW, > instead it gets data from the write notifier, so it's not a big problem. > However, exporting the target to NBD etc. won't work, because of the > likely stale metadata cache. > > Use BDRV_O_NO_BACKING in this case and manually set up the backing > BdrvChild. > > Cc: qemu-sta...@nongnu.org > Signed-off-by: Fam Zheng <f...@redhat.com>
Actually Cc qemu-stable. (git-publish does unified Cc for each patch in a whole series, hence the noise. Sorry.) Fam
