[PATCH v2 0/3] Rust block device driver API and null block driver

[Andreas Hindborg <nmi@metaspace.dk>]

From: Andreas Hindborg <a.hindborg@samsung.com>

Hi All!

Kernel robot found a few issues with the first iteration of this patch [1]. I
also rebased the patch on the Rust PR for 6.10 [2], because we have some changes
to allocation going in, and this patch needs updates for those changes.

This is a resend to correct those issues.

Changes from v1:

- Fix paths in doc comments so they are correct and `rustdoc` does not complain.
- Fix a typo regarding stabilization of `const_refs_to_static`.
- Properly gate `to_blk_status` behind `CONFIG_BLOCK`.
- Update doc comment, a sector is usually 4096 bytes, not 512.
- Update doc comment, use consistent unit names.
- Rebase on `rust-6.10`.

I did not change the interface to use bytes rather than sectors, even though I
like the idea. I think it is preferable to have some similarity to the C API for
now.

Best regards,
Andreas Hindborg

Link: https://lore.kernel.org/all/20240512183950.1982353-1-nmi@metaspace.dk/ [1]
Link: https://lore.kernel.org/all/20240512202215.67763-1-ojeda@kernel.org/ [2]

Andreas Hindborg (3):
  rust: block: introduce `kernel::block::mq` module
  rust: block: add rnull, Rust null_blk implementation
  MAINTAINERS: add entry for Rust block device driver API

 MAINTAINERS                        |  14 ++
 drivers/block/Kconfig              |   9 ++
 drivers/block/Makefile             |   3 +
 drivers/block/rnull.rs             |  86 ++++++++++
 rust/bindings/bindings_helper.h    |   2 +
 rust/helpers.c                     |  16 ++
 rust/kernel/block.rs               |   5 +
 rust/kernel/block/mq.rs            |  99 ++++++++++++
 rust/kernel/block/mq/gen_disk.rs   | 206 ++++++++++++++++++++++++
 rust/kernel/block/mq/operations.rs | 245 +++++++++++++++++++++++++++++
 rust/kernel/block/mq/raw_writer.rs |  55 +++++++
 rust/kernel/block/mq/request.rs    | 227 ++++++++++++++++++++++++++
 rust/kernel/block/mq/tag_set.rs    |  93 +++++++++++
 rust/kernel/error.rs               |   6 +
 rust/kernel/lib.rs                 |   2 +
 15 files changed, 1068 insertions(+)
 create mode 100644 drivers/block/rnull.rs
 create mode 100644 rust/kernel/block.rs
 create mode 100644 rust/kernel/block/mq.rs
 create mode 100644 rust/kernel/block/mq/gen_disk.rs
 create mode 100644 rust/kernel/block/mq/operations.rs
 create mode 100644 rust/kernel/block/mq/raw_writer.rs
 create mode 100644 rust/kernel/block/mq/request.rs
 create mode 100644 rust/kernel/block/mq/tag_set.rs


base-commit: 97ab3e8eec0ce79d9e265e6c9e4c480492180409
-- 
2.44.0