[PATCH 0/5] Rust support for `struct iov_iter`

Alice Ryhl
2025-03-11T14:25:59Z

This series adds support for the `struct iov_iter` type. This type
represents an IO buffer for reading or writing, and can be configured
for either direction of communication.

In Rust, we define separate types for reading and writing. This will
ensure that you cannot mix them up and e.g. call copy_from_iter in a
read_iter syscall.

To use the new abstractions, miscdevices are given new methods read_iter
and write_iter that can be used to implement the read/write syscalls on
a miscdevice. The miscdevice sample is updated to provide read/write
operations.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Alice Ryhl (4):
rust: iov: add iov_iter abstractions for ITER_SOURCE
rust: iov: add iov_iter abstractions for ITER_DEST
rust: miscdevice: Provide additional abstractions for iov_iter and kiocb structures
rust: alloc: add Vec::clear

Lee Jones (1):
samples: rust_misc_device: Expand the sample to support read()ing from userspace

rust/kernel/alloc/kvec.rs | 27 ++++
rust/kernel/iov.rs | 308 +++++++++++++++++++++++++++++++++++++++
rust/kernel/lib.rs | 1 +
rust/kernel/miscdevice.rs | 97 +++++++++++-
samples/rust/rust_misc_device.rs | 37 ++++-
5 files changed, 467 insertions(+), 3 deletions(-)
---
base-commit: 046cc01be6b9d139b49dfc396b7201c633ff1a26
change-id: 20250311-iov-iter-c984aea07d18

Best regards,
--
Alice Ryhl <aliceryhl@google.com>