v4: - add block-copy documentation - block-copy style fixes - fix blkmirror_cancel method - blkmirror style fixes - add escaping to blkmirror pathnames - add blkmirror documentation
v3: - replace commit file with mirrored writes - address comments from round 2 v2: - use reference counting to be safe against device hotplug / bdrv_truncate - add comment about usage of timer
