Kpartx

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FAQ

Map devices of disk

kpartx -av /some/disk

and you'll find them in /dev/mapper

What loopback devices are in use?

losetup

Release loopback device

First try

kpartx -d

then

losetup -d /dev/loop1

device-mapper: reload ioctl on loop1p2 (252:19) failed: Invalid argument