Hello, Libublk-rs(Rust)[1][2] 0.1.0 is released. The original idea is to use Rust to write ublk target for covering all kinds of block queue limits/parameters combination easily when talking with Andreas and Shinichiro about blktests in LSFMM/BPF 2023. Finally it is evolved into one generic library. Attributed to Rust's some modern language features, libublk interfaces are pretty simple: - one closure(tgt_init) for user to customize device by providing all kind of parameter - the other closure(io handling) for user to handling IO which is completely io_uring CQE driven: a) IO command CQE from ublk driver, b) target IO CQE originated from target io handling code, c) eventfd CQE if IO is offloaded to other context With low level APIs, <50 LoC can build one ublk-null, and if high level APIs are used, 30 LoC is enough. Performance is basically aligned with pure C ublk implementation[3]. The library has been verified on null, ramdisk, loop and zoned target. The plan is to support async/await in 0.2 or 0.3 so that libublk can be used to build complicated target easily and efficiently. Thanks Andreas for reviewing and providing lots of good ideas for improvement & cleanup. Thanks German Maglione for some suggestions, such as eventfd support. Thanks Joe for providing excellent Rust programming guide. Any feedback is welcome! [1] https://crates.io/crates/libublk [2] https://github.com/ming1/libublk-rs [3] https://github.com/osandov/blktests/blob/master/src/miniublk.c Thanks, Ming
