2 files changed, 38 insertions, 0 deletions
diff --git a/kernel/include/kernel/filesystem/ext2/filesystem.hpp b/kernel/include/kernel/filesystem/ext2/filesystem.hpp
index 65324c8..a71385f 100644
--- a/kernel/include/kernel/filesystem/ext2/filesystem.hpp
+++ b/kernel/include/kernel/filesystem/ext2/filesystem.hpp
@@ -19,6 +19,27 @@
 namespace kernel::filesystem::ext2
 {
   /**
+  @brief Constants related to the ext2 filesystem.
+  */
+  namespace constants
+  {
+    constexpr size_t inline base_block_size = 1024;
+    constexpr size_t inline superblock_offset = base_block_size;
+    constexpr uint16_t inline magic_number = 0xEF53;
+
+    constexpr uint32_t inline root_inode_number = 2;
+
+    constexpr size_t inline direct_block_count = 12;
+    constexpr size_t inline singly_indirect_block_index = direct_block_count;
+    constexpr size_t inline doubly_indirect_block_index = singly_indirect_block_index + 1;
+    constexpr size_t inline triply_indirect_block_index = doubly_indirect_block_index + 1;
+
+    constexpr uint16_t inline mode_mask = 0xF000;
+    constexpr uint16_t inline mode_regular = 0x8000;
+    constexpr uint16_t inline mode_directory = 0x4000;
+  }  // namespace constants
+
+  /**
   @brief A filesystem implementation for the ext2 filesystem format. This class provides methods for mounting an ext2
   filesystem, and looking up inodes.
   */
diff --git a/kernel/include/kernel/test_support/filesystem/ext2.hpp b/kernel/include/kernel/test_support/filesystem/ext2.hpp
new file mode 100644
index 0000000..edbda29
--- /dev/null
+++ b/kernel/include/kernel/test_support/filesystem/ext2.hpp
@@ -0,0 +1,17 @@
+#ifndef TEACHOS_KERNEL_TEST_SUPPORT_FILESYSTEM_EXT2_HPP
+#define TEACHOS_KERNEL_TEST_SUPPORT_FILESYSTEM_EXT2_HPP
+
+#include "kernel/test_support/devices/block_device.hpp"
+
+#include <cstddef>
+#include <cstdint>
+
+namespace kernel::tests::filesystem::ext2
+{
+  auto write_bytes(kernel::tests::devices::block_device & device, size_t offset, void const * source, size_t size)
+      -> void;
+  auto write_u32(kernel::tests::devices::block_device & device, size_t offset, uint32_t value) -> void;
+  auto setup_mock_ext2_layout(kernel::tests::devices::block_device & device) -> void;
+}  // namespace kernel::tests::filesystem::ext2
+
+#endif
+\ No newline at end of file