The
null block
driver (null_blk)
is a small driver that is mostly useful for benchmarking block-layer implementations. It accepts all requests and marks them complete as quickly as possible, doing as little work as possible. In June 2026, Andreas Hindborg shared

a patch set implementing the same functionality in Rust, in order to show
that a simple block driver is now possible to write using the kernel's
Rust APIs and to enable comparisons between the C and Rust
implementations.
A minimal version of the "rnull" driver is already present in the mainline kernel, but Hindborg's patch set brings it up to feature parity with the C version.

https://lwn.net/Articles/1090378/
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