From: Benno Lossin <benno.lossin@proton.me>
To: Alice Ryhl <aliceryhl@google.com>
Cc: "Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Wedson Almeida Filho" <wedsonaf@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Andreas Hindborg" <a.hindborg@samsung.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Arve Hjønnevåg" <arve@android.com>,
"Todd Kjos" <tkjos@android.com>,
"Martijn Coenen" <maco@android.com>,
"Joel Fernandes" <joel@joelfernandes.org>,
"Carlos Llamas" <cmllamas@google.com>,
"Suren Baghdasaryan" <surenb@google.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Kees Cook" <keescook@chromium.org>,
"Matthew Wilcox" <willy@infradead.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Daniel Xu" <dxu@dxuuu.xyz>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 4/7] rust: file: add `FileDescriptorReservation`
Date: Thu, 30 Nov 2023 16:40:08 +0000 [thread overview]
Message-ID: <_xnOTacjwsOFSA4oog2DJs0VLa1w0EaSPM3rqDUjIZAmNgiq0V0-bJwfVZdDKaydes_rJb30Zz4TyacYImYZHK6i0-LR8AYbQa2T1l0h3K8=@proton.me> (raw)
In-Reply-To: <20231129-alice-file-v1-4-f81afe8c7261@google.com>
On 11/29/23 14:11, Alice Ryhl wrote:
> +impl FileDescriptorReservation {
> + /// Creates a new file descriptor reservation.
> + pub fn new(flags: u32) -> Result<Self> {
> + // SAFETY: FFI call, there are no safety requirements on `flags`.
> + let fd: i32 = unsafe { bindings::get_unused_fd_flags(flags) };
> + if fd < 0 {
> + return Err(Error::from_errno(fd));
> + }
I think here we could also use the modified `to_result` function that
returns a `u32` if the value is non-negative.
> + Ok(Self {
> + fd: fd as _,
> + _not_send_sync: PhantomData,
> + })
> + }
> +
> + /// Returns the file descriptor number that was reserved.
> + pub fn reserved_fd(&self) -> u32 {
> + self.fd
> + }
> +
> + /// Commits the reservation.
> + ///
> + /// The previously reserved file descriptor is bound to `file`. This method consumes the
> + /// [`FileDescriptorReservation`], so it will not be usable after this call.
> + pub fn commit(self, file: ARef<File>) {
> + // SAFETY: `self.fd` was previously returned by `get_unused_fd_flags`, and `file.ptr` is
> + // guaranteed to have an owned ref count by its type invariants.
> + unsafe { bindings::fd_install(self.fd, file.0.get()) };
> +
> + // `fd_install` consumes both the file descriptor and the file reference, so we cannot run
> + // the destructors.
> + core::mem::forget(self);
> + core::mem::forget(file);
Would be useful to have an `ARef::into_raw` function that would do
the `forget` for us.
--
Cheers,
Benno
next prev parent reply other threads:[~2023-11-30 16:40 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-29 12:51 [PATCH 0/7] File abstractions needed by Rust Binder Alice Ryhl
2023-11-29 12:51 ` [PATCH 1/7] rust: file: add Rust abstraction for `struct file` Alice Ryhl
2023-11-29 15:13 ` Matthew Wilcox
2023-11-29 15:23 ` Peter Zijlstra
2023-11-29 17:08 ` Boqun Feng
2023-11-30 10:42 ` Peter Zijlstra
2023-11-30 15:25 ` Boqun Feng
2023-12-01 8:53 ` Peter Zijlstra
2023-12-01 9:19 ` Boqun Feng
2023-12-01 9:40 ` Peter Zijlstra
2023-12-01 10:36 ` Boqun Feng
2023-12-01 11:05 ` Peter Zijlstra
2023-12-01 9:00 ` Peter Zijlstra
2023-12-01 9:52 ` Boqun Feng
2023-11-29 16:42 ` Alice Ryhl
2023-11-29 16:45 ` Peter Zijlstra
2023-11-30 15:02 ` Benno Lossin
2023-11-29 17:06 ` Christian Brauner
2023-11-29 21:27 ` Alice Ryhl
2023-11-29 23:17 ` Benno Lossin
2023-11-30 10:48 ` Christian Brauner
2023-11-30 12:10 ` Alice Ryhl
2023-11-30 12:36 ` Christian Brauner
2023-11-30 14:53 ` Benno Lossin
2023-11-30 14:59 ` Greg Kroah-Hartman
2023-11-30 15:46 ` Benno Lossin
2023-11-30 15:56 ` Greg Kroah-Hartman
2023-11-30 15:58 ` Theodore Ts'o
2023-11-30 16:12 ` Benno Lossin
2023-12-01 1:16 ` Theodore Ts'o
2023-12-01 12:11 ` David Laight
2023-12-01 12:27 ` Alice Ryhl
2023-12-01 15:04 ` Theodore Ts'o
2023-12-01 15:14 ` Benno Lossin
2023-12-01 17:25 ` David Laight
2023-12-01 17:37 ` Benno Lossin
2023-11-29 12:51 ` [PATCH 2/7] rust: cred: add Rust abstraction for `struct cred` Alice Ryhl
2023-11-30 16:17 ` Benno Lossin
2023-12-01 9:06 ` Alice Ryhl
2023-12-01 10:27 ` Christian Brauner
2023-12-04 15:42 ` Alice Ryhl
2023-11-29 13:11 ` [PATCH 3/7] rust: security: add abstraction for secctx Alice Ryhl
2023-11-30 16:26 ` Benno Lossin
2023-12-01 10:48 ` Alice Ryhl
2023-12-02 10:03 ` Benno Lossin
2023-11-29 13:11 ` [PATCH 4/7] rust: file: add `FileDescriptorReservation` Alice Ryhl
2023-11-29 16:14 ` Christian Brauner
2023-11-29 16:55 ` Alice Ryhl
2023-11-29 17:14 ` Alice Ryhl
2023-11-30 9:12 ` Christian Brauner
2023-11-30 9:23 ` Alice Ryhl
2023-11-30 9:09 ` Christian Brauner
2023-11-30 9:17 ` Alice Ryhl
2023-11-30 10:51 ` Christian Brauner
2023-11-30 11:54 ` Alice Ryhl
2023-11-30 12:17 ` Benno Lossin
2023-11-30 12:33 ` Christian Brauner
2023-11-30 16:40 ` Benno Lossin [this message]
2023-12-01 11:32 ` Alice Ryhl
2023-11-29 13:12 ` [PATCH 5/7] rust: file: add `Kuid` wrapper Alice Ryhl
2023-11-29 16:28 ` Christian Brauner
2023-11-29 16:48 ` Peter Zijlstra
2023-11-30 12:46 ` Christian Brauner
2023-12-06 19:59 ` Kent Overstreet
2023-12-08 16:26 ` Peter Zijlstra
2023-12-08 19:58 ` Kent Overstreet
2023-12-08 5:28 ` comex
2023-12-08 16:19 ` Miguel Ojeda
2023-12-08 17:08 ` Nick Desaulniers
2023-12-08 17:37 ` Miguel Ojeda
2023-12-08 17:43 ` Boqun Feng
2023-12-08 20:43 ` Matthew Wilcox
2023-12-09 7:24 ` comex
2023-11-30 9:36 ` Alice Ryhl
2023-11-30 10:52 ` Christian Brauner
2023-11-30 10:36 ` Peter Zijlstra
2023-12-06 20:02 ` Kent Overstreet
2023-12-07 7:18 ` Greg Kroah-Hartman
2023-12-07 7:46 ` Kent Overstreet
2023-11-30 16:48 ` Benno Lossin
2023-11-29 13:12 ` [PATCH 6/7] rust: file: add `DeferredFdCloser` Alice Ryhl
2023-11-30 17:12 ` Benno Lossin
2023-12-01 11:35 ` Alice Ryhl
2023-12-02 10:16 ` Benno Lossin
2023-12-05 14:43 ` Alice Ryhl
2023-12-05 18:16 ` Alice Ryhl
2023-11-29 13:12 ` [PATCH 7/7] rust: file: add abstraction for `poll_table` Alice Ryhl
2023-11-30 17:42 ` Benno Lossin
2023-12-01 11:47 ` Alice Ryhl
2023-11-30 22:39 ` Boqun Feng
2023-12-01 11:50 ` Alice Ryhl
2023-11-30 22:50 ` Boqun Feng
2023-11-29 16:31 ` [PATCH 0/7] File abstractions needed by Rust Binder Christian Brauner
2023-11-29 16:48 ` Miguel Ojeda
2023-12-06 20:05 ` Kent Overstreet
2023-12-08 16:59 ` Miguel Ojeda
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