tmpfs: add DirInode skeleton

kernel/src/fs/VFS.h

@@ -14,7 +14,7 @@ namespace VFS
     class Inode
     {
       public:
-        virtual Result<Inode*> find(const char* name) const = 0;
+        virtual Result<SharedPtr<Inode>> find(const char* name) const = 0;
 
         virtual FileSystem& fs() const = 0;
 
@@ -28,7 +28,7 @@ namespace VFS
     class FileInode : Inode
     {
       public:
-        Result<Inode*> find(const char*) const override
+        Result<SharedPtr<Inode>> find(const char*) const override
         {
             return err(ENOTDIR);
         }

kernel/src/fs/tmpfs/FileSystem.cpp

@@ -1,5 +1,6 @@
 #include "fs/tmpfs/FileSystem.h"
 #include <luna/Alloc.h>
+#include <luna/Ignore.h>
 
 namespace TmpFS
 {
@@ -25,4 +26,10 @@ namespace TmpFS
     {
         m_root_inode = root;
     }
+
+    Result<SharedPtr<VFS::Inode>> DirInode::find(const char* name) const
+    {
+        ignore(name);
+        todo();
+    }
 }

kernel/src/fs/tmpfs/FileSystem.h

@@ -62,4 +62,43 @@ namespace TmpFS
         VFS::FileSystem* m_fs;
         usize m_inode_number;
     };
+
+    class DirInode : public VFS::Inode
+    {
+      public:
+        DirInode() = default;
+
+        void set_fs(FileSystem& fs, Badge<FileSystem>)
+        {
+            m_fs = &fs;
+        }
+
+        void set_inode_number(usize inum, Badge<FileSystem>)
+        {
+            m_inode_number = inum;
+        }
+
+        Result<SharedPtr<VFS::Inode>> find(const char* name) const override;
+
+        VFS::FileSystem& fs() const override
+        {
+            return *m_fs;
+        }
+
+        usize inode_number() const override
+        {
+            return m_inode_number;
+        }
+
+        VFS::InodeType type() const override
+        {
+            return VFS::InodeType::Directory;
+        }
+
+        virtual ~DirInode() = default;
+
+      private:
+        VFS::FileSystem* m_fs;
+        usize m_inode_number;
+    };
 }