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

implement basic vfs

See merge request teachos/kernel!16

1 files changed, 61 insertions, 0 deletions

diff --git a/kernel/src/filesystem/dentry.cpp b/kernel/src/filesystem/dentry.cpp
new file mode 100644
index 0000000..76949f2
--- /dev/null
+++ b/kernel/src/filesystem/dentry.cpp
@@ -0,0 +1,61 @@
+#include "kernel/filesystem/dentry.hpp"
+
+#include "kapi/system.hpp"
+
+#include "kernel/filesystem/inode.hpp"
+
+#include <kstd/memory>
+
+#include <algorithm>
+#include <cstdint>
+#include <string_view>
+
+namespace filesystem
+{
+  dentry::dentry(kstd::shared_ptr<dentry> const & parent, kstd::shared_ptr<inode> const & node, std::string_view name)
+      : m_name(name)
+      , m_parent(parent)
+      , m_inode(node)
+  {
+    if (!m_inode)
+    {
+      kapi::system::panic("[FILESYSTEM] dentry constructed with null inode.");
+    }
+  }
+
+  auto dentry::get_inode() const -> kstd::shared_ptr<inode> const &
+  {
+    return m_inode;
+  }
+
+  auto dentry::get_parent() const -> kstd::shared_ptr<dentry> const &
+  {
+    return m_parent;
+  }
+
+  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 filesystem
\ No newline at end of file