loopdev-3 is used at run time in 1 crate (of which 1 optionally). It's used only as a dev dependency in 3 crates.

Depender (with downloads and own rev deps) loopdev-3 version
132K 12 sys-mount optional ^0.5.0
12K 2 devicemapper dev ^0.5.0
7.4K 3 libcryptsetup-rs dev ^0.5.0
240 stratisd dev ^0.5.1