linux-kernel - [PATCH v3 09/10] rust: debugfs: support binary large objects for ScopedDir

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Message-ID: <20251022143158.64475-10-dakr@kernel.org>
Date: Wed, 22 Oct 2025 16:30:43 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	lossin@...nel.org,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	mmaurer@...gle.com
Cc: rust-for-linux@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH v3 09/10] rust: debugfs: support binary large objects for ScopedDir

Add support for creating binary debugfs files via ScopedDir. This
mirrors the existing functionality for Dir, but without producing an
owning handle -- files are automatically removed when the associated
Scope is dropped.

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Matthew Maurer <mmaurer@...gle.com>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/debugfs.rs | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/rust/kernel/debugfs.rs b/rust/kernel/debugfs.rs
index d2bc7550d81e..e8139d2e5730 100644
--- a/rust/kernel/debugfs.rs
+++ b/rust/kernel/debugfs.rs
@@ -530,6 +530,20 @@ pub fn read_only_file<T: Writer + Send + Sync + 'static>(&self, name: &CStr, dat
         self.create_file(name, data, &T::FILE_OPS)
     }
 
+    /// Creates a read-only binary file in this directory.
+    ///
+    /// The file's contents are produced by invoking [`BinaryWriter::write_to_slice`].
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn read_binary_file<T: BinaryWriter + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        self.create_file(name, data, &T::FILE_OPS)
+    }
+
     /// Creates a read-only file in this directory, with contents from a callback.
     ///
     /// The file contents are generated by calling `f` with `data`.
@@ -567,6 +581,22 @@ pub fn read_write_file<T: Writer + Reader + Send + Sync + 'static>(
         self.create_file(name, data, vtable)
     }
 
+    /// Creates a read-write binary file in this directory.
+    ///
+    /// Reading the file uses the [`BinaryWriter`] implementation on `data`. Writing to the file
+    /// uses the [`BinaryReader`] implementation on `data`.
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn read_write_binary_file<T: BinaryWriter + BinaryReader + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        let vtable = &<T as BinaryReadWriteFile<_>>::FILE_OPS;
+        self.create_file(name, data, vtable)
+    }
+
     /// Creates a read-write file in this directory, with logic from callbacks.
     ///
     /// Reading from the file is handled by `f`. Writing to the file is handled by `w`.
@@ -606,6 +636,20 @@ pub fn write_only_file<T: Reader + Send + Sync + 'static>(&self, name: &CStr, da
         self.create_file(name, data, vtable)
     }
 
+    /// Creates a write-only binary file in this directory.
+    ///
+    /// Writing to the file uses the [`BinaryReader`] implementation on `data`.
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn write_binary_file<T: BinaryReader + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        self.create_file(name, data, &T::FILE_OPS)
+    }
+
     /// Creates a write-only file in this directory, with write logic from a callback.
     ///
     /// Writing to the file is handled by `w`.
-- 
2.51.0