This series adds support for Rust code into bcachefs. This only enables using Rust internally within bcachefs; there are no public Rust APIs added. Rust support is hidden behind a new config option, CONFIG_BCACHEFS_RUST. It is optional and bcachefs can still be built with full functionality without rust. I wasn't sure if this needed to be an RFC based on the current status of accepting Rust code outside of the rust/ tree, so I designated it as such to be safe. However, Kent plans to merge rust+bcachefs code in the 6.9 merge window, so I hope at least the first 2 patches in this series, the ones that actually enable Rust for bcachefs, can be accepted. #1 is a prerequisite in KBuild. In order to call bindgen commands in the fs/bcachefs tree, the bindgen commands need to be defined in the top-level scripts/Makefile.build along with the rustc commands, instead of in rust/Makefile. This is the only patch outside of fs/bcachefs/ in this series. #2 creates the framework to use rust-bindgen in fs/bcachefs and introduces the new config option to enable this. This patch does not actually generate any Rust bindings; it just lays the foundation for future patches to create bindings. #3 demonstrates the new Rust functionality by implementing the module entry and exit functions for bcachefs in Rust. The current C entry and exit are retained so that bcachefs can still be built without Rust. Given Kent's goal to use Rust more in bcachefs, the C functions will presumably be dropped in the future. Thomas Bertschinger (3): kbuild: rust: move bindgen commands to top-level bcachefs: create framework for Rust bindings bcachefs: introduce Rust module implementation fs/bcachefs/.gitignore | 3 ++ fs/bcachefs/Kconfig | 6 +++ fs/bcachefs/Makefile | 12 +++++ fs/bcachefs/bcachefs.h | 5 ++ fs/bcachefs/bcachefs_module.rs | 66 ++++++++++++++++++++++++ fs/bcachefs/bindgen_parameters | 16 ++++++ fs/bcachefs/bindings/bindings_helper.h | 7 +++ fs/bcachefs/bindings/mod.rs | 5 ++ fs/bcachefs/super.c | 31 +++++++++-- rust/Makefile | 67 ------------------------ scripts/Makefile.build | 71 ++++++++++++++++++++++++++ 11 files changed, 219 insertions(+), 70 deletions(-) create mode 100644 fs/bcachefs/.gitignore create mode 100644 fs/bcachefs/bcachefs_module.rs create mode 100644 fs/bcachefs/bindgen_parameters create mode 100644 fs/bcachefs/bindings/bindings_helper.h create mode 100644 fs/bcachefs/bindings/mod.rs -- 2.43.0
