Re: [PATCH 1/5] rust: iov: add iov_iter abstractions for ITER_SOURCE

[Andreas Hindborg <a.hindborg@kernel.org>]

Hi Alice,

"Alice Ryhl" <aliceryhl@google.com> writes:

> This adds abstractions for the iov_iter type in the case where
> data_source is ITER_SOURCE. This will make Rust implementations of
> fops->write_iter possible.
>
> This series only has support for using existing IO vectors created by C
> code. Additional abstractions will be needed to support the creation of
> IO vectors in Rust code.
>
> These abstractions make the assumption that `struct iov_iter` does not
> have internal self-references, which implies that it is valid to move it
> between different local variables, and that you can make a copy of it to
> get two IO vectors into the same buffers.
>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>

This does not build for me:


    error[E0405]: cannot find trait `Allocator` in this scope
      --> /home/aeh/src/linux-rust/linux/rust/kernel/iov.rs:133:34
        |
    133 |     pub fn copy_from_iter_vec<A: Allocator>(
        |                                  ^^^^^^^^^ not found in this scope
        |
    help: consider importing one of these items
        |
    10  + use core::alloc::Allocator;
        |
    10  + use crate::alloc::Allocator;
        |

    error[E0412]: cannot find type `Flags` in this scope
      --> /home/aeh/src/linux-rust/linux/rust/kernel/iov.rs:136:16
        |
    136 |         flags: Flags,
        |                ^^^^^ not found in this scope
        |
    help: consider importing this struct
        |
    10  + use crate::alloc::Flags;
        |

      RUSTC L rust/kernel.o
    error: aborting due to 2 previous errors


Best regards,
Andreas Hindborg