From 98fff0dc733050d8bbdfba5235de918ba15fee0e Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 24 Aug 2026 10:59:02 +0200
Subject: kernel/fs: extract module registrations

---
 kernel/CMakeLists.txt                          |  3 +++
 kernel/kernel/filesystem/devfs/filesystem.cpp  | 16 ---------------
 kernel/kernel/filesystem/devfs/module.cpp      | 28 ++++++++++++++++++++++++++
 kernel/kernel/filesystem/ext2/filesystem.cpp   | 21 ++-----------------
 kernel/kernel/filesystem/ext2/module.cpp       | 26 ++++++++++++++++++++++++
 kernel/kernel/filesystem/rootfs/filesystem.cpp | 17 ----------------
 kernel/kernel/filesystem/rootfs/module.cpp     | 28 ++++++++++++++++++++++++++
 7 files changed, 87 insertions(+), 52 deletions(-)
 create mode 100644 kernel/kernel/filesystem/devfs/module.cpp
 create mode 100644 kernel/kernel/filesystem/ext2/module.cpp
 create mode 100644 kernel/kernel/filesystem/rootfs/module.cpp

diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index 2cca2dda..6f998084 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -72,15 +72,18 @@ target_sources("kernel_lib" PRIVATE
     # DevFS Filesystem
     "kernel/filesystem/devfs/filesystem.cpp"
     "kernel/filesystem/devfs/inode.cpp"
+    "kernel/filesystem/devfs/module.cpp"
 
     # ext2 Filesystem
     "kernel/filesystem/ext2/error.cpp"
     "kernel/filesystem/ext2/filesystem.cpp"
     "kernel/filesystem/ext2/inode.cpp"
+    "kernel/filesystem/ext2/module.cpp"
 
     # Rootfs Filesystem
     "kernel/filesystem/rootfs/filesystem.cpp"
     "kernel/filesystem/rootfs/inode.cpp"
+    "kernel/filesystem/rootfs/module.cpp"
 )
 
 file(GLOB_RECURSE KERNEL_HEADERS
diff --git a/kernel/kernel/filesystem/devfs/filesystem.cpp b/kernel/kernel/filesystem/devfs/filesystem.cpp
index a7c8e50c..0de513a7 100644
--- a/kernel/kernel/filesystem/devfs/filesystem.cpp
+++ b/kernel/kernel/filesystem/devfs/filesystem.cpp
@@ -3,7 +3,6 @@
 #include <kernel/filesystem/devfs/inode.hpp>
 #include <kernel/filesystem/device_inode.hpp>
 #include <kernel/filesystem/device_number_registry.hpp>
-#include <kernel/filesystem/driver_registry.hpp>
 #include <kernel/filesystem/error.hpp>
 #include <kernel/filesystem/filesystem.hpp>
 #include <kernel/filesystem/inode.hpp>
@@ -21,21 +20,6 @@
 
 namespace kernel::filesystem::devfs
 {
-  struct descriptor final : kernel::filesystem::driver_descriptor
-  {
-    [[nodiscard]] auto name() const noexcept -> std::string_view override
-    {
-      return "devfs";
-    }
-
-    [[nodiscard]] auto make_instance() const -> filesystem::filesystem_ptr override
-    {
-      return kstd::make_shared<filesystem>();
-    }
-  };
-
-  [[gnu::used]]
-  constexpr auto registration = driver_module<descriptor>{};
 
   static_assert(sizeof(kernel::filesystem::filesystem) == sizeof(devfs::filesystem));
 
diff --git a/kernel/kernel/filesystem/devfs/module.cpp b/kernel/kernel/filesystem/devfs/module.cpp
new file mode 100644
index 00000000..a7a1aca9
--- /dev/null
+++ b/kernel/kernel/filesystem/devfs/module.cpp
@@ -0,0 +1,28 @@
+#include <kernel/filesystem/devfs/filesystem.hpp>
+#include <kernel/filesystem/driver_registry.hpp>
+#include <kernel/filesystem/filesystem.hpp>
+
+#include <kstd/memory.hpp>
+
+#include <string_view>
+
+namespace
+{
+
+  struct descriptor final : kernel::filesystem::driver_descriptor
+  {
+    [[nodiscard]] auto name() const noexcept -> std::string_view override
+    {
+      return "devfs";
+    }
+
+    [[nodiscard]] auto make_instance() const -> kernel::filesystem::filesystem::filesystem_ptr override
+    {
+      return kstd::make_shared<kernel::filesystem::devfs::filesystem>();
+    }
+  };
+
+  [[gnu::used]]
+  constexpr auto registration = kernel::filesystem::driver_module<descriptor>{};
+
+}  // namespace
\ No newline at end of file
diff --git a/kernel/kernel/filesystem/ext2/filesystem.cpp b/kernel/kernel/filesystem/ext2/filesystem.cpp
index 579094e0..92945eb2 100644
--- a/kernel/kernel/filesystem/ext2/filesystem.cpp
+++ b/kernel/kernel/filesystem/ext2/filesystem.cpp
@@ -1,6 +1,5 @@
 #include <kernel/filesystem/ext2/filesystem.hpp>
 
-#include <kernel/filesystem/driver_registry.hpp>
 #include <kernel/filesystem/error.hpp>
 #include <kernel/filesystem/ext2/block_group_descriptor.hpp>
 #include <kernel/filesystem/ext2/error.hpp>
@@ -35,24 +34,6 @@ using namespace kstd::units_literals;
 namespace kernel::filesystem::ext2
 {
 
-  struct descriptor final : kernel::filesystem::driver_descriptor
-  {
-    [[nodiscard]] auto name() const noexcept -> std::string_view override
-    {
-      return "ext2";
-    }
-
-    [[nodiscard]] auto make_instance() const -> filesystem::filesystem_ptr override
-    {
-      return kstd::make_shared<filesystem>();
-    }
-  };
-
-  [[gnu::used]]
-  constexpr auto registration = driver_module<descriptor>{};
-
-  static_assert(sizeof(kernel::filesystem::filesystem) == sizeof(kernel::filesystem::ext2::filesystem));
-
   namespace
   {
     [[nodiscard]] auto bitmap_is_set(kstd::vector<uint8_t> const & bitmap, size_t index) -> bool
@@ -74,6 +55,8 @@ namespace kernel::filesystem::ext2
                                             read_only_compatible_features::large_file_support;
   }  // namespace
 
+  static_assert(sizeof(kernel::filesystem::filesystem) == sizeof(kernel::filesystem::ext2::filesystem));
+
   auto filesystem::indirect_levels(mount_state const & state) const -> std::array<indirect_level, 3>
   {
     return {
diff --git a/kernel/kernel/filesystem/ext2/module.cpp b/kernel/kernel/filesystem/ext2/module.cpp
new file mode 100644
index 00000000..e6b14307
--- /dev/null
+++ b/kernel/kernel/filesystem/ext2/module.cpp
@@ -0,0 +1,26 @@
+#include <kernel/filesystem/driver_registry.hpp>
+#include <kernel/filesystem/ext2/filesystem.hpp>
+#include <kernel/filesystem/filesystem.hpp>
+
+#include <kstd/memory.hpp>
+
+#include <string_view>
+
+namespace
+{
+  struct descriptor final : kernel::filesystem::driver_descriptor
+  {
+    [[nodiscard]] auto name() const noexcept -> std::string_view override
+    {
+      return "ext2";
+    }
+
+    [[nodiscard]] auto make_instance() const -> kernel::filesystem::filesystem::filesystem_ptr override
+    {
+      return kstd::make_shared<kernel::filesystem::ext2::filesystem>();
+    }
+  };
+
+  [[gnu::used]]
+  constexpr auto registration = kernel::filesystem::driver_module<descriptor>{};
+}  // namespace
diff --git a/kernel/kernel/filesystem/rootfs/filesystem.cpp b/kernel/kernel/filesystem/rootfs/filesystem.cpp
index a14addba..4618fd69 100644
--- a/kernel/kernel/filesystem/rootfs/filesystem.cpp
+++ b/kernel/kernel/filesystem/rootfs/filesystem.cpp
@@ -1,6 +1,5 @@
 #include <kernel/filesystem/rootfs/filesystem.hpp>
 
-#include <kernel/filesystem/driver_registry.hpp>
 #include <kernel/filesystem/error.hpp>
 #include <kernel/filesystem/filesystem.hpp>
 #include <kernel/filesystem/rootfs/inode.hpp>
@@ -17,22 +16,6 @@
 
 namespace kernel::filesystem::rootfs
 {
-  struct descriptor final : kernel::filesystem::driver_descriptor
-  {
-    [[nodiscard]] auto name() const noexcept -> std::string_view override
-    {
-      return "rootfs";
-    }
-
-    [[nodiscard]] auto make_instance() const -> filesystem::filesystem_ptr override
-    {
-      return kstd::make_shared<filesystem>();
-    }
-  };
-
-  [[gnu::used]]
-  constexpr auto registration = driver_module<descriptor>{};
-
   static_assert(sizeof(kernel::filesystem::filesystem) == sizeof(rootfs::filesystem));
 
   auto filesystem::probe(inode_ptr const & inode) const -> kstd::result<std::uint32_t>
diff --git a/kernel/kernel/filesystem/rootfs/module.cpp b/kernel/kernel/filesystem/rootfs/module.cpp
new file mode 100644
index 00000000..464120b2
--- /dev/null
+++ b/kernel/kernel/filesystem/rootfs/module.cpp
@@ -0,0 +1,28 @@
+#include <kernel/filesystem/driver_registry.hpp>
+#include <kernel/filesystem/filesystem.hpp>
+#include <kernel/filesystem/rootfs/filesystem.hpp>
+
+#include <kstd/memory.hpp>
+
+#include <string_view>
+
+namespace
+{
+
+  struct descriptor final : kernel::filesystem::driver_descriptor
+  {
+    [[nodiscard]] auto name() const noexcept -> std::string_view override
+    {
+      return "rootfs";
+    }
+
+    [[nodiscard]] auto make_instance() const -> kernel::filesystem::filesystem::filesystem_ptr override
+    {
+      return kstd::make_shared<kernel::filesystem::rootfs::filesystem>();
+    }
+  };
+
+  [[gnu::used]]
+  constexpr auto registration = kernel::filesystem::driver_module<descriptor>{};
+
+}  // namespace
\ No newline at end of file
-- 
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