From 62005f563e3c29b079c69380905a82fd0d91c975 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Mon, 16 Mar 2026 18:27:59 +0100
Subject: add first draft of inode metadata

---
 .../include/filesystem/ext2/ext2_filesystem.hpp    |  4 ++++
 .../filesystem/include/filesystem/filesystem.hpp   |  6 +++++-
 kernel/filesystem/include/filesystem/inode.hpp     |  7 +++++++
 .../include/filesystem/inode_metadata.hpp          | 24 ++++++++++++++++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 kernel/filesystem/include/filesystem/inode_metadata.hpp

(limited to 'kernel/filesystem/include')

diff --git a/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp b/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp
index 91ba14a..cba2192 100644
--- a/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp
+++ b/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp
@@ -3,12 +3,16 @@
 
 #include "devices/device.hpp"
 #include "filesystem/filesystem.hpp"
+#include "filesystem/inode.hpp"
+
+#include <string_view>
 
 namespace filesystem::ext2
 {
   struct ext2_filesystem : filesystem
   {
     auto mount(devices::device * device) -> int override;
+    auto lookup(inode const & parent, std::string_view name) -> inode * override;
 
   private:
     devices::device * m_device{};
diff --git a/kernel/filesystem/include/filesystem/filesystem.hpp b/kernel/filesystem/include/filesystem/filesystem.hpp
index 2077ed6..8deb336 100644
--- a/kernel/filesystem/include/filesystem/filesystem.hpp
+++ b/kernel/filesystem/include/filesystem/filesystem.hpp
@@ -4,6 +4,8 @@
 #include "devices/device.hpp"
 #include "filesystem/inode.hpp"
 
+#include <string_view>
+
 namespace filesystem
 {
   struct filesystem
@@ -11,8 +13,10 @@ namespace filesystem
     virtual ~filesystem() = default;
 
     virtual auto mount(devices::device * device) -> int = 0;
+    virtual auto lookup(inode const & parent, std::string_view name) -> inode * = 0;
 
-    [[nodiscard]] auto root_inode() const -> inode const &;
+    [[nodiscard]] auto root_inode() -> inode *;
+    [[nodiscard]] auto root_inode() const -> inode const *;
 
   protected:
     inode m_root_inode{};  // TODO BA-FS26 set during mount?
diff --git a/kernel/filesystem/include/filesystem/inode.hpp b/kernel/filesystem/include/filesystem/inode.hpp
index eb8440f..bceabb6 100644
--- a/kernel/filesystem/include/filesystem/inode.hpp
+++ b/kernel/filesystem/include/filesystem/inode.hpp
@@ -2,6 +2,7 @@
 #define TEACH_OS_KERNEL_FILESYSTEM_INODE_HPP
 
 #include "devices/device.hpp"
+#include "filesystem/inode_metadata.hpp"
 
 #include <cstddef>
 
@@ -10,8 +11,13 @@ namespace filesystem
   struct inode
   {
     inode() = default;
+    explicit inode(inode_kind kind);
     explicit inode(devices::device * device);
 
+    [[nodiscard]] auto metadata() const -> inode_metadata;
+
+    [[nodiscard]] auto is_directory() const -> bool;
+    [[nodiscard]] auto is_regular() const -> bool;
     [[nodiscard]] auto is_device() const -> bool;
     [[nodiscard]] auto is_block_device() const -> bool;
     [[nodiscard]] auto major_device() const -> size_t;
@@ -22,6 +28,7 @@ namespace filesystem
     auto write(void const * buffer, size_t offset, size_t size) -> size_t;
 
   private:
+    inode_kind m_kind{inode_kind::regular};
     devices::device * m_device{};
   };
 }  // namespace filesystem
diff --git a/kernel/filesystem/include/filesystem/inode_metadata.hpp b/kernel/filesystem/include/filesystem/inode_metadata.hpp
new file mode 100644
index 0000000..ed5a09d
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/inode_metadata.hpp
@@ -0,0 +1,24 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_INODE_METADATA_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_INODE_METADATA_HPP
+
+#include <cstddef>
+#include <optional>
+
+namespace filesystem
+{
+  enum class inode_kind
+  {
+    regular,
+    directory,
+    device
+  };
+
+  struct inode_metadata
+  {
+    inode_kind kind{inode_kind::regular};
+    std::optional<size_t> major{};
+    std::optional<size_t> minor{};
+  };
+}  // namespace filesystem
+
+#endif  // TEACH_OS_KERNEL_FILESYSTEM_INODE_METADATA_HPP
\ No newline at end of file
-- 
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