In June 2026 a patch set added a Rust implementation of the null block driver (rnull) that matches the feature set of the existing C version.
- June 2026 patch
- feature parity with C
The rnull driver is used for benchmarking block‑layer performance by instantly completing requests. The Rust version demonstrates that simple kernel drivers can now be written with the kernel's Rust APIs, enabling direct C vs Rust performance comparisons.




