linux-kernel - RE: [PATCH 1/7] rust: file: add Rust abstraction for `struct file`

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Message-ID: <386bbdee165d47338bc451a04e788dd6@AcuMS.aculab.com>
Date:   Fri, 1 Dec 2023 12:11:16 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Benno Lossin' <benno.lossin@...ton.me>,
        Theodore Ts'o <tytso@....edu>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        "Boqun Feng" <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        "Andreas Hindborg" <a.hindborg@...sung.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Carlos Llamas <cmllamas@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Xu <dxu@...uu.xyz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH 1/7] rust: file: add Rust abstraction for `struct file`

> > I don't know about Rust namespacing, but in other languages, how you
> > have to especify namespaces tend to be ***far*** more verbose than
> > just adding an O_ prefix.
> 
> In this case we already have the `flags` namespace, so I thought about
> just dropping the `O_` prefix altogether.

Does rust have a 'using namespace' (or similar) so that namespace doesn't
have to be explicitly specified each time a value is used?
If so you still need a hint about which set of values it is from.

Otherwise you get into the same mess as C++ class members (I think
they should have been .member from the start).
Or, worse still, Pascal and multiple 'with' blocks.

	David

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