At present, the available facts around block devices are not sufficient to be able to find stable names guaranteed to work across reboots, or to identify block devices by label (UUID, etc).
This patch provides a list of observed links for each device. It relies on functionality specific to Linux (as does the existing sysfs-based code which it extends), but should not cause issues on other platforms.
Moreover, it prevents virtual devices from being excluded, and links such devices to the physical devices to which they are attached.
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