From 03788775fbebbb3669c115b7653af59194b167d3 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 26 Aug 2026 19:12:56 +0200
Subject: kernel/fs: vfs: make file descriptor polymorphic

---
 kernel/kapi/filesystem.cpp | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

(limited to 'kernel/kapi/filesystem.cpp')

diff --git a/kernel/kapi/filesystem.cpp b/kernel/kapi/filesystem.cpp
index 3708c15d..e4b3443a 100644
--- a/kernel/kapi/filesystem.cpp
+++ b/kernel/kapi/filesystem.cpp
@@ -1,5 +1,7 @@
 #include <kapi/filesystem.hpp>
 
+#include <kernel/filesystem/byte_offset_file_descriptor.hpp>
+#include <kernel/filesystem/directory_file_descriptor.hpp>
 #include <kernel/filesystem/open_file_descriptor.hpp>
 #include <kernel/filesystem/open_file_table.hpp>
 #include <kernel/filesystem/vfs.hpp>
@@ -28,10 +30,17 @@ namespace kapi::filesystem
 
   auto open(std::string_view path) -> kstd::result<std::size_t>
   {
-    return kernel::filesystem::vfs::get().open(path).and_then([](auto dentry) {
-      auto open_file_descriptor = kstd::make_shared<kernel::filesystem::open_file_descriptor>(dentry);
-      return kernel::filesystem::open_file_table::get().add_file(open_file_descriptor);
-    });
+    return kernel::filesystem::vfs::get()
+        .open(path)
+        .transform([](auto dentry) -> kstd::shared_ptr<kernel::filesystem::open_file_descriptor> {
+          if (dentry->inode()->is_directory())
+          {
+            return kstd::make_shared<kernel::filesystem::directory_file_descriptor>(dentry);
+          }
+          return kstd::make_shared<kernel::filesystem::byte_offset_file_descriptor>(dentry);
+        })
+        .and_then(
+            [](auto file_descriptor) { return kernel::filesystem::open_file_table::get().add_file(file_descriptor); });
   }
 
   auto close(size_t file_descriptor) -> kstd::result<void>
-- 
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