[RFC PATCH v2 0/4] rust: miscdevice: abstraction for uring-cmd

[Sidong Yang <sidong.yang@furiosa.ai>]

This patch series implemens an abstraction for io-uring sqe and cmd and
adds uring_cmd callback for miscdevice. Also there is an example that use
uring_cmd in rust-miscdevice sample.

I received a email from kernel bot that `io_tw_state` is not FFI-safe.
It seems that the struct has no field how can I fix this?

Changelog:
v2:
* use pinned &mut for IoUringCmd
* add missing safety comments
* use write_volatile for read uring_cmd in sample

Sidong Yang (4):
  rust: bindings: add io_uring headers in bindings_helper.h
  rust: io_uring: introduce rust abstraction for io-uring cmd
  rust: miscdevice: add uring_cmd() for MiscDevice trait
  samples: rust: rust_misc_device: add uring_cmd example

 rust/bindings/bindings_helper.h  |   2 +
 rust/kernel/io_uring.rs          | 183 +++++++++++++++++++++++++++++++
 rust/kernel/lib.rs               |   1 +
 rust/kernel/miscdevice.rs        |  41 +++++++
 samples/rust/rust_misc_device.rs |  34 ++++++
 5 files changed, 261 insertions(+)
 create mode 100644 rust/kernel/io_uring.rs

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2.43.0