From f669454966c9fa8cbdbbefb1d9cfdd61026849f9 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Fri, 20 Mar 2026 21:47:58 +0100
Subject: improve architecture again -> use same architecture for devices and
 ext2_files

---
 kernel/include/kernel/filesystem/disk_file.hpp     | 19 ++++++++++++++++
 .../include/kernel/filesystem/ext2/ext2_file.hpp   |  4 ++--
 .../include/kernel/filesystem/ext2/ext2_inode.hpp  |  5 +++--
 kernel/include/kernel/filesystem/inode_file.hpp    | 25 ++++++++++++++++++++++
 4 files changed, 49 insertions(+), 4 deletions(-)
 create mode 100644 kernel/include/kernel/filesystem/disk_file.hpp
 create mode 100644 kernel/include/kernel/filesystem/inode_file.hpp

(limited to 'kernel/include')

diff --git a/kernel/include/kernel/filesystem/disk_file.hpp b/kernel/include/kernel/filesystem/disk_file.hpp
new file mode 100644
index 0000000..c6a7655
--- /dev/null
+++ b/kernel/include/kernel/filesystem/disk_file.hpp
@@ -0,0 +1,19 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_DISK_FILE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_DISK_FILE_HPP
+
+#include <kstd/memory>
+
+#include <cstddef>
+
+namespace filesystem
+{
+  struct disk_file
+  {
+    virtual ~disk_file() = default;
+
+    virtual auto read(void * buffer, size_t offset, size_t size) const -> size_t = 0;
+    virtual auto write(void const * buffer, size_t offset, size_t size) -> size_t = 0;
+  };
+}  // namespace filesystem
+
+#endif
\ No newline at end of file
diff --git a/kernel/include/kernel/filesystem/ext2/ext2_file.hpp b/kernel/include/kernel/filesystem/ext2/ext2_file.hpp
index b5708d8..371507d 100644
--- a/kernel/include/kernel/filesystem/ext2/ext2_file.hpp
+++ b/kernel/include/kernel/filesystem/ext2/ext2_file.hpp
@@ -1,13 +1,13 @@
 #ifndef TEACH_OS_KERNEL_FILESYSTEM_EXT2_FILE_HPP
 #define TEACH_OS_KERNEL_FILESYSTEM_EXT2_FILE_HPP
 
-#include "kernel/filesystem/file.hpp"
+#include "kernel/filesystem/disk_file.hpp"
 
 #include <cstddef>
 
 namespace filesystem::ext2
 {
-  struct ext2_file : file
+  struct ext2_file : disk_file
   {
     auto read(void * buffer, size_t offset, size_t size) const -> size_t override;
     auto write(void const * buffer, size_t offset, size_t size) -> size_t override;
diff --git a/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp b/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
index f103877..7b5ff3f 100644
--- a/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
+++ b/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
@@ -1,6 +1,7 @@
 #ifndef TEACH_OS_KERNEL_FILESYSTEM_EXT2_INODE_HPP
 #define TEACH_OS_KERNEL_FILESYSTEM_EXT2_INODE_HPP
 
+#include "kernel/filesystem/disk_file.hpp"
 #include "kernel/filesystem/file.hpp"
 #include "kernel/filesystem/inode.hpp"
 
@@ -10,12 +11,12 @@ namespace filesystem::ext2
 {
   struct ext2_inode : inode
   {
-    ext2_inode();
+    explicit ext2_inode(kstd::shared_ptr<disk_file> const & disk_file);
 
     [[nodiscard]] auto open_file() const -> kstd::shared_ptr<file> override;
 
   private:
-    // TODO BA-FS26 add ext2-specific inode metadata here (e.g. block pointers, size, permissions, etc.)
+    kstd::shared_ptr<disk_file> m_disk_file{};
   };
 }  // namespace filesystem::ext2
 
diff --git a/kernel/include/kernel/filesystem/inode_file.hpp b/kernel/include/kernel/filesystem/inode_file.hpp
new file mode 100644
index 0000000..3e2b954
--- /dev/null
+++ b/kernel/include/kernel/filesystem/inode_file.hpp
@@ -0,0 +1,25 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_INODE_FILE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_INODE_FILE_HPP
+
+#include "kernel/filesystem/disk_file.hpp"
+#include "kernel/filesystem/file.hpp"
+
+#include <kstd/memory>
+
+#include <cstddef>
+
+namespace filesystem
+{
+  struct inode_file : file
+  {
+    explicit inode_file(kstd::shared_ptr<disk_file> const & disk_file);
+
+    auto read(void * buffer, size_t offset, size_t size) const -> size_t override;
+    auto write(void const * buffer, size_t offset, size_t size) -> size_t override;
+
+  private:
+    kstd::shared_ptr<disk_file> m_disk_file;
+  };
+}  // namespace filesystem
+
+#endif
\ No newline at end of file
-- 
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