From: Wedson Almeida Filho <walmeida@xxxxxxxxxxxxx>
This is in preparation for allowing modules to implement different
address space callbacks, which will be introduced in subsequent patches.
Signed-off-by: Wedson Almeida Filho <walmeida@xxxxxxxxxxxxx>
---
rust/kernel/fs.rs | 1 +
rust/kernel/fs/address_space.rs | 58 +++++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)
create mode 100644 rust/kernel/fs/address_space.rs
diff --git a/rust/kernel/fs.rs b/rust/kernel/fs.rs
index 20fb6107eb4b..f1c1972fabcf 100644
--- a/rust/kernel/fs.rs
+++ b/rust/kernel/fs.rs
@@ -13,6 +13,7 @@
use macros::{pin_data, pinned_drop};
use sb::SuperBlock;
+pub mod address_space;
pub mod dentry;
pub mod file;
pub mod inode;
diff --git a/rust/kernel/fs/address_space.rs b/rust/kernel/fs/address_space.rs
new file mode 100644
index 000000000000..5b4fcb568f46
--- /dev/null
+++ b/rust/kernel/fs/address_space.rs
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! File system address spaces.
+//!
+//! This module allows Rust code implement address space operations.
+//!
+//! C headers: [`include/linux/fs.h`](srctree/include/linux/fs.h)
+
+use super::FileSystem;
+use crate::bindings;
+use core::marker::PhantomData;
+use macros::vtable;
+
+/// Operations implemented by address spaces.
+#[vtable]
+pub trait Operations {
+ /// File system that these operations are compatible with.
+ type FileSystem: FileSystem + ?Sized;
+}
+
+/// Represents address space operations.
+#[allow(dead_code)]
+pub struct Ops<T: FileSystem + ?Sized>(
+ pub(crate) *const bindings::address_space_operations,
+ pub(crate) PhantomData<T>,
+);
+
+impl<T: FileSystem + ?Sized> Ops<T> {
+ /// Creates the address space operations from a type that implements the [`Operations`] trait.
+ pub const fn new<U: Operations<FileSystem = T> + ?Sized>() -> Self {
+ struct Table<T: Operations + ?Sized>(PhantomData<T>);
+ impl<T: Operations + ?Sized> Table<T> {
+ const TABLE: bindings::address_space_operations = bindings::address_space_operations {
+ writepage: None,
+ read_folio: None,
+ writepages: None,
+ dirty_folio: None,
+ readahead: None,
+ write_begin: None,
+ write_end: None,
+ bmap: None,
+ invalidate_folio: None,
+ release_folio: None,
+ free_folio: None,
+ direct_IO: None,
+ migrate_folio: None,
+ launder_folio: None,
+ is_partially_uptodate: None,
+ is_dirty_writeback: None,
+ error_remove_folio: None,
+ swap_activate: None,
+ swap_deactivate: None,
+ swap_rw: None,
+ };
+ }
+ Self(&Table::<U>::TABLE, PhantomData)
+ }
+}
--
2.34.1
