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For DM devices, the add/change/remove can appear as action for genuine udev events. However, there are more action types (bind, unbind, move, online, offline) which never appear as actions for genuine DM udev events, but they can still be synthesized (e.g. by writing "<action>" to "/sys/.../uevent" file or by calling "udevadm trigger --action=<action>"). Let's also process these extra action types so that the udev-related content is not lost completely, keeping all the symlinks and udev db entries just like this was a synthetic udev event with "change" action. Related to https://gitlab.com/lvmteam/lvm2/-/issues/4.