Merge branch 'mount-reference-count' into 'develop-BA-FS26'

Mount reference count

See merge request teachos/kernel!37

1 files changed, 28 insertions, 0 deletions

diff --git a/kernel/src/filesystem/mount.cpp b/kernel/src/filesystem/mount.cpp
index 749c86a..1e04083 100644
--- a/kernel/src/filesystem/mount.cpp
+++ b/kernel/src/filesystem/mount.cpp
@@ -8,6 +8,7 @@
 #include <kstd/memory>
 #include <kstd/string>
 
+#include <cstddef>
 #include <string_view>
 
 namespace kernel::filesystem
@@ -18,6 +19,7 @@ namespace kernel::filesystem
       , m_root_dentry(root_dentry)
       , m_filesystem(fs)
       , m_parent_mount(parent_mount)
+      , m_ref_count(0)
   {
     if (!m_filesystem)
     {
@@ -53,4 +55,30 @@ namespace kernel::filesystem
   {
     return m_parent_mount;
   }
+
+  auto mount::increment_ref_count() -> void
+  {
+    m_ref_count += 1;
+  }
+
+  auto mount::decrement_ref_count() -> bool
+  {
+    if (m_ref_count == 0)
+    {
+      return false;
+    }
+
+    m_ref_count -= 1;
+    return true;
+  }
+
+  auto mount::is_ready_to_unmount() const -> bool
+  {
+    return m_ref_count == 0;
+  }
+
+  auto mount::get_ref_count() const -> size_t
+  {
+    return m_ref_count;
+  }
 }  // namespace kernel::filesystem
\ No newline at end of file