From 31ac3e6ffff00b7ac3b3dbb3db38c44409251b34 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Thu, 26 Mar 2026 20:09:37 +0100
Subject: first draft of an devfs implementation

---
 .../kernel/filesystem/devfs/devfs_filesystem.hpp   | 25 ++++++++++++++++++++++
 .../kernel/filesystem/devfs/devfs_root_inode.hpp   | 19 ++++++++++++++++
 kernel/include/kernel/filesystem/device_inode.hpp  |  2 ++
 kernel/include/kernel/filesystem/vfs.hpp           | 13 -----------
 4 files changed, 46 insertions(+), 13 deletions(-)
 create mode 100644 kernel/include/kernel/filesystem/devfs/devfs_filesystem.hpp
 create mode 100644 kernel/include/kernel/filesystem/devfs/devfs_root_inode.hpp

(limited to 'kernel/include')

diff --git a/kernel/include/kernel/filesystem/devfs/devfs_filesystem.hpp b/kernel/include/kernel/filesystem/devfs/devfs_filesystem.hpp
new file mode 100644
index 0000000..5559c2a
--- /dev/null
+++ b/kernel/include/kernel/filesystem/devfs/devfs_filesystem.hpp
@@ -0,0 +1,25 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_DEVFS_DEVFS_FILESYSTEM_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_DEVFS_DEVFS_FILESYSTEM_HPP
+
+#include "kernel/devices/device.hpp"
+#include "kernel/filesystem/filesystem.hpp"
+#include "kernel/filesystem/inode.hpp"
+
+#include <kstd/memory>
+#include <kstd/vector>
+
+#include <string_view>
+
+namespace filesystem::devfs
+{
+  struct devfs_filesystem : filesystem
+  {
+    auto mount(kstd::shared_ptr<devices::device> const & device) -> int override;
+    auto lookup(kstd::shared_ptr<inode> const & parent, std::string_view name) -> kstd::shared_ptr<inode> override;
+
+  private:
+    auto build_device_inode_table() -> void;
+  };
+}  // namespace filesystem::devfs
+
+#endif
\ No newline at end of file
diff --git a/kernel/include/kernel/filesystem/devfs/devfs_root_inode.hpp b/kernel/include/kernel/filesystem/devfs/devfs_root_inode.hpp
new file mode 100644
index 0000000..b1d37ab
--- /dev/null
+++ b/kernel/include/kernel/filesystem/devfs/devfs_root_inode.hpp
@@ -0,0 +1,19 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_DEVFS_DEVFS_ROOT_INODE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_DEVFS_DEVFS_ROOT_INODE_HPP
+
+#include "kernel/filesystem/inode.hpp"
+
+#include <cstddef>
+
+namespace filesystem::devfs
+{
+  struct devfs_root_inode : inode
+  {
+    devfs_root_inode();
+
+    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;
+  };
+}  // namespace filesystem::devfs
+
+#endif
\ No newline at end of file
diff --git a/kernel/include/kernel/filesystem/device_inode.hpp b/kernel/include/kernel/filesystem/device_inode.hpp
index ce0f91c..1cf08d4 100644
--- a/kernel/include/kernel/filesystem/device_inode.hpp
+++ b/kernel/include/kernel/filesystem/device_inode.hpp
@@ -18,6 +18,8 @@ namespace filesystem
     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;
 
+    [[nodiscard]] auto device() const -> kstd::shared_ptr<devices::device> const &;
+
   private:
     using block_op = void (*)(size_t idx, size_t off, size_t len, size_t done, devices::block_device * device,
                               std::byte * scratch, void * buffer);
diff --git a/kernel/include/kernel/filesystem/vfs.hpp b/kernel/include/kernel/filesystem/vfs.hpp
index cf268a3..f301b7a 100644
--- a/kernel/include/kernel/filesystem/vfs.hpp
+++ b/kernel/include/kernel/filesystem/vfs.hpp
@@ -1,17 +1,13 @@
 #ifndef TEACH_OS_KERNEL_FILESYSTEM_VFS_HPP
 #define TEACH_OS_KERNEL_FILESYSTEM_VFS_HPP
 
-#include "kernel/devices/device.hpp"
 #include "kernel/filesystem/dentry.hpp"
 #include "kernel/filesystem/filesystem.hpp"
-#include "kernel/filesystem/inode.hpp"
 #include "kernel/filesystem/mount_table.hpp"
 #include "kernel/filesystem/open_file_description.hpp"
 
 #include <kstd/memory>
-#include <kstd/vector>
 
-#include <optional>
 #include <string_view>
 
 namespace filesystem
@@ -27,18 +23,9 @@ namespace filesystem
     auto do_mount(std::string_view path, kstd::shared_ptr<filesystem> const & filesystem) -> int;
 
   private:
-    // TODO BA-FS26 remove again and use devtempfs
-    struct device_node_entry
-    {
-      std::string_view name;
-      kstd::shared_ptr<inode> node;
-    };
-    kstd::vector<std::optional<device_node_entry>> m_device_nodes;  // TODO BA-FS26 remove again, use devtempfs
-
     vfs() = default;
     auto init_internal() -> void;
 
-    auto make_device_node(kstd::shared_ptr<devices::device> const & device) -> void;
     [[nodiscard]] auto resolve_path(std::string_view path) -> kstd::shared_ptr<dentry>;
 
     mount_table m_mount_table;
-- 
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