Merge pull request #194 from dezgeg/blockdev #742

Job	Run time
cargo check (ubuntu-latest)	18s
cargo test (ubuntu-latest)	31s
cargo check (macOS-latest)	30s
Code Coverage (ubuntu-latest, unix)	1m 56s
cargo clippy -- -D warnings (ubuntu-latest)	24s
cargo test (macOS-latest)	39s
cargo check (windows-latest)	2m 5s
Code Coverage (macos-latest, macos)	1m 49s
cargo clippy -- -D warnings (macOS-latest)	41s
cargo test (windows-latest)	2m 15s
Code Coverage (windows-latest, windows)	4m 47s
cargo clippy -- -D warnings (windows-latest)	1m 34s
cargo fmt --all -- --check	4s
	17m 33s

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