I have to map several loopback devices via dmsetup.

I could track which loopback device is mapped to a particular /dev/dm-X device file, but is there an easy way to get this info by the /dev/dm-X itself?

dmsetup info was of no help for me here.


The constituent devices are under /sys/block/dm-X/slaves. E.g.,

$ ls /sys/block/dm-2/slaves/

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