From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 107842FAC0C; Wed, 22 Oct 2025 14:32:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761143549; cv=none; b=VRulrYOYwk/euB0ckc+m1vvOYgRmgtU6iQ6wkwqMuI4+qmvtTqg9b9qvZRSxfXrOSwRoasx8/tPWUTJysBiQ2RLuYEqbCDmwsX/hbF9fG6E+tSMuM6cni0u28QiH6wW1r5ddOGfkv4rEUlUfzJMKEzEL+IlkKSSQPRlTccrJCCU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761143549; c=relaxed/simple; bh=3cFpxpxpPxPs/cBsHHXElxYbWoxDVBrn7wce7vGXY5I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oWdsZ97TMi6ch10m3ni4GLqdiSN8D5lXnIIYQYo1BKALOyEjWqjkEJnwXKCEonTON4F9L0LGi0sorxY+dmiqLzm9TgmxfcpYdy2KSQAAQ5D/FrruJDBeUmGzpnfsU/Xtft6Tr7shrtG2IYLViiev7570rHEdwiFT9rXfQpN+n8s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LQOCSdAJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LQOCSdAJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 600BBC113D0; Wed, 22 Oct 2025 14:32:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761143548; bh=3cFpxpxpPxPs/cBsHHXElxYbWoxDVBrn7wce7vGXY5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LQOCSdAJnDVoKKmIxk1n9f8P6hZBGUlF03Nnr4mQHUa1oyHXjtS0yGQF+RDkuMHfO A+18SGQevTcphtT69TWpktl+qUBPBLMp4YN4zHih11H4ZnWqg4RJZNJktLWMaY5vuD x5dPmaWhW2S1lonT5j4m4QVlm1e8pINScAw6j2L5TXOSKlLo8dso3uGMHd6zMGLieT Posrw2naMnOW2ilQqPgKGsYYXI2NLyHhe956AHSZqlkZ9fOgO1jTQ0Er+Y+jz2V6CL 3R/2P36Sa+QiYElWvD9YHgl15N2AOd3hcbZYHPjPrGhBATgmtg3zYmsKyMGr1gGeFV sMYlXe37I+Y7w== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, mmaurer@google.com Cc: rust-for-linux@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Danilo Krummrich Subject: [PATCH v3 05/10] rust: uaccess: add UserSliceWriter::write_slice_file() Date: Wed, 22 Oct 2025 16:30:39 +0200 Message-ID: <20251022143158.64475-6-dakr@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251022143158.64475-1-dakr@kernel.org> References: <20251022143158.64475-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add UserSliceWriter::write_slice_file(), which is the same as UserSliceWriter::write_slice_partial() but updates the given file::Offset by the number of bytes written. This is equivalent to C's `simple_read_from_buffer()` and useful when dealing with file offsets from file operations. Signed-off-by: Danilo Krummrich --- rust/kernel/uaccess.rs | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs index 539e77a09cbc..20ea31781efb 100644 --- a/rust/kernel/uaccess.rs +++ b/rust/kernel/uaccess.rs @@ -495,6 +495,30 @@ pub fn write_slice_partial(&mut self, data: &[u8], offset: usize) -> Result Result { + if offset.is_negative() { + return Err(EINVAL); + } + + let Ok(offset_index) = (*offset).try_into() else { + return Ok(0); + }; + + let written = self.write_slice_partial(data, offset_index)?; + + *offset = offset.saturating_add_usize(written); + + Ok(written) + } + /// Writes the provided Rust value to this userspace pointer. /// /// Fails with [`EFAULT`] if the write happens on a bad address, or if the write goes out of -- 2.51.0