From feab4cd81f2bbc89e55353a54df2575b9c21b514 Mon Sep 17 00:00:00 2001
From: Marcel Braun <marcel.braun@ost.ch>
Date: Sun, 10 May 2026 20:07:51 +0200
Subject: Add method that returns the next ancestor with mount flag set

---
 kernel/include/kernel/filesystem/dentry.hpp |  6 ++++++
 kernel/src/filesystem/dentry.cpp            | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/kernel/include/kernel/filesystem/dentry.hpp b/kernel/include/kernel/filesystem/dentry.hpp
index 226f2b9..1d99a25 100644
--- a/kernel/include/kernel/filesystem/dentry.hpp
+++ b/kernel/include/kernel/filesystem/dentry.hpp
@@ -60,6 +60,12 @@ namespace kernel::filesystem
      */
     [[nodiscard]] auto get_absolute_path() const -> kstd::string;
 
+    /**
+    @brief traverse parent dentries until dentry with mount flag is found.
+    @return The found dentry.
+    */
+    [[nodiscard]] auto get_ancestor_with_mount_flag() const -> kstd::shared_ptr<dentry>;
+
     /**
     @brief Add a @p child dentry.
     @param child The child dentry to add.
diff --git a/kernel/src/filesystem/dentry.cpp b/kernel/src/filesystem/dentry.cpp
index a77ce23..6945a27 100644
--- a/kernel/src/filesystem/dentry.cpp
+++ b/kernel/src/filesystem/dentry.cpp
@@ -66,6 +66,16 @@ namespace kernel::filesystem
     return path;
   }
 
+  auto dentry::get_ancestor_with_mount_flag() const -> kstd::shared_ptr<dentry>
+  {
+    auto parent = m_parent;
+    while (parent && !parent->has_flag(dentry_flags::mounted))
+    {
+      parent = parent->get_parent();
+    }
+    return parent;
+  }
+
   auto dentry::add_child(kstd::shared_ptr<dentry> const & child) -> void
   {
     m_children.push_back(child);
-- 
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