Merge branch 'develop-BA-FS26' into 'develop'HEADdevelop

Merge of BA-FS26 branch into develop

See merge request teachos/kernel!49

1 files changed, 95 insertions, 0 deletions

diff --git a/kernel/src/filesystem/dentry.cpp b/kernel/src/filesystem/dentry.cpp
new file mode 100644
index 0000000..3d8e01a
--- /dev/null
+++ b/kernel/src/filesystem/dentry.cpp
@@ -0,0 +1,95 @@
+#include <kernel/filesystem/dentry.hpp>
+
+#include <kernel/filesystem/inode.hpp>
+
+#include <kapi/system.hpp>
+
+#include <kstd/memory>
+#include <kstd/string>
+
+#include <algorithm>
+#include <cstdint>
+#include <string_view>
+
+namespace kernel::filesystem
+{
+  dentry::dentry(kstd::shared_ptr<dentry> const & parent, kstd::shared_ptr<inode> const & inode, std::string_view name)
+      : m_name(name)
+      , m_parent(parent)
+      , m_inode(inode)
+      , m_flags(0)
+  {
+    if (!m_inode)
+    {
+      kapi::system::panic("[FILESYSTEM] dentry constructed with null inode.");
+    }
+    if (m_name.empty())
+    {
+      kapi::system::panic("[FILESYSTEM] dentry constructed with empty name.");
+    }
+  }
+
+  auto dentry::get_inode() const -> kstd::shared_ptr<inode> const &
+  {
+    return m_inode;
+  }
+
+  auto dentry::parent() const -> kstd::shared_ptr<dentry> const &
+  {
+    return m_parent;
+  }
+
+  auto dentry::name() const -> std::string_view
+  {
+    return m_name;
+  }
+
+  auto dentry::absolute_path() const -> kstd::string
+  {
+    kstd::string path = m_name;
+
+    auto parent = m_parent;
+    while (parent)
+    {
+      auto parent_name = parent->m_name;
+      if (parent_name == "/")
+      {
+        path = "/" + path;
+      }
+      else
+      {
+        path = parent_name + "/" + path;
+      }
+
+      parent = parent->m_parent;
+    }
+
+    return path;
+  }
+
+  auto dentry::add_child(kstd::shared_ptr<dentry> const & child) -> void
+  {
+    m_children.push_back(child);
+  }
+
+  auto dentry::find_child(std::string_view name) const -> kstd::shared_ptr<dentry>
+  {
+    auto it = std::ranges::find_if(m_children, [&](auto const & child) { return child->m_name == name; });
+    return (it != m_children.end()) ? *it : nullptr;
+  }
+
+  auto dentry::set_flag(dentry_flags flag) -> void
+  {
+    m_flags |= static_cast<uint32_t>(flag);
+  }
+
+  auto dentry::unset_flag(dentry_flags flag) -> void
+  {
+    m_flags &= ~static_cast<uint32_t>(flag);
+  }
+
+  auto dentry::has_flag(dentry_flags flag) const -> bool
+  {
+    return (m_flags & static_cast<uint32_t>(flag)) != 0;
+  }
+}  // namespace kernel::filesystem
\ No newline at end of file