I'd say the best "who-uses" tool in this case is "lsblk" - it's directly a part of util-linux which is everywhere and it shows quickly the block device tree as well as mount status (it just looks at sysfs info and provides it in nice human readable form, machine readable form is also possible though for use in scripts). LVM itself already uses this tool within helper "blkdeactivate" script that deactivates tree of DM/LVM devices.
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