From 760752ef2045aaceb0393911a0919f9bc0104282 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Sun, 15 Mar 2026 20:37:14 +0100
Subject: implement first inode draft, fix make_device_node, implement first
 draft of resolve_path (currently with temp m_device_nodes in vfs -> has later
 to be deleted again, just for tests)

---
 kernel/filesystem/include/filesystem/filesystem.hpp |  4 ++--
 kernel/filesystem/include/filesystem/inode.hpp      | 15 +++++++++++++++
 kernel/filesystem/include/filesystem/vfs.hpp        | 15 ++++++++++++++-
 3 files changed, 31 insertions(+), 3 deletions(-)

(limited to 'kernel/filesystem/include')

diff --git a/kernel/filesystem/include/filesystem/filesystem.hpp b/kernel/filesystem/include/filesystem/filesystem.hpp
index a5a1047..2077ed6 100644
--- a/kernel/filesystem/include/filesystem/filesystem.hpp
+++ b/kernel/filesystem/include/filesystem/filesystem.hpp
@@ -12,10 +12,10 @@ namespace filesystem
 
     virtual auto mount(devices::device * device) -> int = 0;
 
-    [[nodiscard]] auto root_inode() const -> inode *;
+    [[nodiscard]] auto root_inode() const -> inode const &;
 
   protected:
-    inode * m_root_inode{};  // TODO BA-FS26 set during mount?
+    inode m_root_inode{};  // TODO BA-FS26 set during mount?
   };
 
 }  // namespace filesystem
diff --git a/kernel/filesystem/include/filesystem/inode.hpp b/kernel/filesystem/include/filesystem/inode.hpp
index 44ec09a..eb8440f 100644
--- a/kernel/filesystem/include/filesystem/inode.hpp
+++ b/kernel/filesystem/include/filesystem/inode.hpp
@@ -1,13 +1,28 @@
 #ifndef TEACH_OS_KERNEL_FILESYSTEM_INODE_HPP
 #define TEACH_OS_KERNEL_FILESYSTEM_INODE_HPP
 
+#include "devices/device.hpp"
+
 #include <cstddef>
+
 namespace filesystem
 {
   struct inode
   {
+    inode() = default;
+    explicit inode(devices::device * device);
+
+    [[nodiscard]] auto is_device() const -> bool;
+    [[nodiscard]] auto is_block_device() const -> bool;
+    [[nodiscard]] auto major_device() const -> size_t;
+    [[nodiscard]] auto minor_device() const -> size_t;
+    [[nodiscard]] auto backing_device() const -> devices::device *;
+
     auto read(void * buffer, size_t offset, size_t size) const -> size_t;
     auto write(void const * buffer, size_t offset, size_t size) -> size_t;
+
+  private:
+    devices::device * m_device{};
   };
 }  // namespace filesystem
 
diff --git a/kernel/filesystem/include/filesystem/vfs.hpp b/kernel/filesystem/include/filesystem/vfs.hpp
index 182666d..a881241 100644
--- a/kernel/filesystem/include/filesystem/vfs.hpp
+++ b/kernel/filesystem/include/filesystem/vfs.hpp
@@ -2,10 +2,14 @@
 #define TEACH_OS_KERNEL_FILESYSTEM_VFS_HPP
 
 #include "devices/device.hpp"
+#include "filesystem/custody.hpp"
+#include "filesystem/inode.hpp"
 #include "filesystem/mount.hpp"
+#include "filesystem/open_file_description.hpp"
 
 #include <array>
 #include <optional>
+#include <string_view>
 
 namespace filesystem
 {
@@ -16,13 +20,22 @@ namespace filesystem
 
     ~vfs() = default;
 
-    auto make_device_node(devices::device * device) -> void;
+    auto open(std::string_view path) -> std::optional<open_file_description>;
 
   private:
+    struct device_node_entry
+    {
+      std::string_view name;
+      inode node;
+    };
+
     vfs() = default;
+    auto make_device_node(devices::device * device) -> void;
+    [[nodiscard]] auto resolve_path(std::string_view path) -> std::optional<custody>;
 
     std::optional<mount> m_root_mount;
     std::array<mount, 10> m_mounts;  // TODO BA-FS26 remove when kstd::vector is available and used
+    std::array<std::optional<device_node_entry>, 10> m_device_nodes;  // TODO BA-FS26 use kstd::vector
   };
 }  // namespace filesystem
 
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