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Sun, 20 Jul 2025 22:42:52 -0700 (PDT) Received: from sidongui-MacBookPro.local ([221.148.76.1]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23e3b6ef82esm49929675ad.209.2025.07.20.22.42.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Jul 2025 22:42:52 -0700 (PDT) Date: Mon, 21 Jul 2025 14:42:47 +0900 From: Sidong Yang To: Caleb Sander Mateos Cc: Miguel Ojeda , Arnd Bergmann , Jens Axboe , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org Subject: Re: [PATCH 3/4] rust: miscdevice: add uring_cmd() for MiscDevice trait Message-ID: References: <20250719143358.22363-1-sidong.yang@furiosa.ai> <20250719143358.22363-4-sidong.yang@furiosa.ai> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Sun, Jul 20, 2025 at 04:08:19PM -0400, Caleb Sander Mateos wrote: > On Sat, Jul 19, 2025 at 10:35 AM Sidong Yang wrote: > > > > This patch adds uring_cmd() function for MiscDevice trait and its > > callback implementation. It uses IoUringCmd that io_uring_cmd rust > > abstraction. > > > > Signed-off-by: Sidong Yang > > --- > > rust/kernel/miscdevice.rs | 34 ++++++++++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/rust/kernel/miscdevice.rs b/rust/kernel/miscdevice.rs > > index 288f40e79906..5255faf27934 100644 > > --- a/rust/kernel/miscdevice.rs > > +++ b/rust/kernel/miscdevice.rs > > @@ -14,6 +14,7 @@ > > error::{to_result, Error, Result, VTABLE_DEFAULT_ERROR}, > > ffi::{c_int, c_long, c_uint, c_ulong}, > > fs::File, > > + io_uring::IoUringCmd, > > mm::virt::VmaNew, > > prelude::*, > > seq_file::SeqFile, > > @@ -175,6 +176,15 @@ fn show_fdinfo( > > ) { > > build_error!(VTABLE_DEFAULT_ERROR) > > } > > + > > + fn uring_cmd( > > + _device: ::Borrowed<'_>, > > + _file: &File, > > + _io_uring_cmd: &IoUringCmd, > > + issue_flags: u32, > > + ) -> Result { > > Would i32 make more sense as the return value, since that's what > io_uring_cqe actually stores? Agreed. thanks. > > > + build_error!(VTABLE_DEFAULT_ERROR) > > + } > > } > > > > /// A vtable for the file operations of a Rust miscdevice. > > @@ -332,6 +342,25 @@ impl MiscdeviceVTable { > > T::show_fdinfo(device, m, file); > > } > > > > + unsafe extern "C" fn uring_cmd( > > + ioucmd: *mut bindings::io_uring_cmd, > > + issue_flags: ffi::c_uint, > > + ) -> ffi::c_int { > > + // SAFETY: The file is valid for the duration of this call. > > + let ioucmd = unsafe { IoUringCmd::from_raw(ioucmd) }; > > + let file = ioucmd.file(); > > + > > + // SAFETY: The file is valid for the duration of this call. > > + let private = unsafe { (*file.as_ptr()).private_data }.cast(); > > + // SAFETY: Ioctl calls can borrow the private data of the file. > > "Ioctl" -> "uring cmd"? Thanks it's a bad mistake. Thanks, Sidong > > Best, > Caleb > > > + let device = unsafe { ::borrow(private) }; > > + > > + match T::uring_cmd(device, file, ioucmd, issue_flags) { > > + Ok(ret) => ret as ffi::c_int, > > + Err(err) => err.to_errno() as ffi::c_int, > > + } > > + } > > + > > const VTABLE: bindings::file_operations = bindings::file_operations { > > open: Some(Self::open), > > release: Some(Self::release), > > @@ -354,6 +383,11 @@ impl MiscdeviceVTable { > > } else { > > None > > }, > > + uring_cmd: if T::HAS_URING_CMD { > > + Some(Self::uring_cmd) > > + } else { > > + None > > + }, > > // SAFETY: All zeros is a valid value for `bindings::file_operations`. > > ..unsafe { MaybeUninit::zeroed().assume_init() } > > }; > > -- > > 2.43.0 > > > >