Re: [libvirt] [PATCH 2/5] qemu: blockcopy: Explicitly assert 'reuse' for block devices

When copying to a block device, the block device will already exist. To allow users using a block device without any preparation, they need to use the block copy without VIR_DOMAIN_BLOCK_COPY_REUSE_EXT. This means that if the target is an existing block device we don't need to prepare it, but we can't reject it as being existing. To avoid breaking this feature, explicitly assume that existing block devices will be reused even without that flag explicitly specified, while skipping attempts to create it. qemuMonitorDriveMirror still needs to honor the flag as specified by the user, since qemu overwrites the metadata otherwise. --- src/qemu/qemu_driver.c | 6 ++++++ 1 file changed, 6 insertions(+)