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/src/inode.cpp | 56 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'kernel/filesystem/src/inode.cpp')

diff --git a/kernel/filesystem/src/inode.cpp b/kernel/filesystem/src/inode.cpp
index 7bca507..a1427e2 100644
--- a/kernel/filesystem/src/inode.cpp
+++ b/kernel/filesystem/src/inode.cpp
@@ -2,18 +2,74 @@
 
 #include "kapi/system.hpp"
 
+#include "devices/device.hpp"
+
 #include <cstddef>
 
 namespace filesystem
 {
+  inode::inode(devices::device * device)
+      : m_device(device)
+  {
+    if (!m_device)
+    {
+      kapi::system::panic("[FILESYSTEM] inode constructed with null device.");
+    }
+  }
+
+  auto inode::is_device() const -> bool
+  {
+    return m_device != nullptr;
+  }
+
+  auto inode::is_block_device() const -> bool
+  {
+    return is_device() && m_device->is_block_device();
+  }
+
+  auto inode::major_device() const -> size_t
+  {
+    if (!is_device())
+    {
+      kapi::system::panic("[FILESYSTEM] inode::major_device called on non-device inode.");
+    }
+
+    return m_device->major();
+  }
+
+  auto inode::minor_device() const -> size_t
+  {
+    if (!is_device())
+    {
+      kapi::system::panic("[FILESYSTEM] inode::minor_device called on non-device inode.");
+    }
+
+    return m_device->minor();
+  }
+
+  auto inode::backing_device() const -> devices::device *
+  {
+    return m_device;
+  }
+
   auto inode::read(void * /*buffer*/, size_t /*offset*/, size_t /*size*/) const -> size_t
   {
+    if (is_device())
+    {
+      kapi::system::panic("[FILESYSTEM] inode::read called on device inode. Open it as a device file first.");
+    }
+
     // TODO BA-FS26
     return 0;
   }
 
   auto inode::write(void const *, size_t, size_t) -> size_t
   {
+    if (is_device())
+    {
+      kapi::system::panic("[FILESYSTEM] inode::write called on device inode. Open it as a device file first.");
+    }
+
     kapi::system::panic("[FILESYSTEM] inode::write is not implemented yet");
     return 0;
   }
-- 
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