From: Wedson Almeida Filho <walmeida@xxxxxxxxxxxxx>
This is in preparation for allowing modules to implement different file
callbacks, which will be introduced in subsequent patches.
Signed-off-by: Wedson Almeida Filho <walmeida@xxxxxxxxxxxxx>
---
rust/kernel/fs/file.rs | 57 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/rust/kernel/fs/file.rs b/rust/kernel/fs/file.rs
index b8386a396251..67dd3ecf7d98 100644
--- a/rust/kernel/fs/file.rs
+++ b/rust/kernel/fs/file.rs
@@ -14,6 +14,7 @@
types::{ARef, AlwaysRefCounted, Opaque},
};
use core::{marker::PhantomData, ptr};
+use macros::vtable;
/// Flags associated with a [`File`].
pub mod flags {
@@ -268,3 +269,59 @@ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.pad("EBADF")
}
}
+
+/// Operations implemented by files.
+#[vtable]
+pub trait Operations {
+ /// File system that these operations are compatible with.
+ type FileSystem: FileSystem + ?Sized;
+}
+
+/// Represents file operations.
+#[allow(dead_code)]
+pub struct Ops<T: FileSystem + ?Sized>(pub(crate) *const bindings::file_operations, PhantomData<T>);
+
+impl<T: FileSystem + ?Sized> Ops<T> {
+ /// Creates file 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::file_operations = bindings::file_operations {
+ owner: ptr::null_mut(),
+ llseek: None,
+ read: None,
+ write: None,
+ read_iter: None,
+ write_iter: None,
+ iopoll: None,
+ iterate_shared: None,
+ poll: None,
+ unlocked_ioctl: None,
+ compat_ioctl: None,
+ mmap: None,
+ mmap_supported_flags: 0,
+ open: None,
+ flush: None,
+ release: None,
+ fsync: None,
+ fasync: None,
+ lock: None,
+ get_unmapped_area: None,
+ check_flags: None,
+ flock: None,
+ splice_write: None,
+ splice_read: None,
+ splice_eof: None,
+ setlease: None,
+ fallocate: None,
+ show_fdinfo: None,
+ copy_file_range: None,
+ remap_file_range: None,
+ fadvise: None,
+ uring_cmd: None,
+ uring_cmd_iopoll: None,
+ };
+ }
+ Self(&Table::<U>::TABLE, PhantomData)
+ }
+}
--
2.34.1
