block migration: Activate image on destination before writing to it
When using 'migrate -b', we must make sure to take ownership of the image before writing to it. Otherwise metadata would be thrown away on migration completion; this was caught by the assertions introduced in commit 09e0c771. Reported-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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