[PATCH v2 7/8] rust: debugfs: support binary large objects for ScopedDir

Danilo Krummrich
2025-10-20T22:28:10Z

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.

Signed-off-by: Danilo Krummrich <dakr@kernel.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