Add inode_file and inode structure

5 files changed, 99 insertions, 3 deletions

diff --git a/kernel/filesystem/CMakeLists.txt b/kernel/filesystem/CMakeLists.txt
index a5a964f..126b54e 100644
--- a/kernel/filesystem/CMakeLists.txt
+++ b/kernel/filesystem/CMakeLists.txt
@@ -3,18 +3,22 @@ add_library("kernel::filesystem" ALIAS "kernel_filesystem")
 
 target_sources("kernel_filesystem" PRIVATE
     "src/device_file.cpp"
-    "src/open_file_description.cpp"
     "src/file_descriptor_table.cpp"
+    "src/inode_file.cpp"
+    "src/inode.cpp"
+    "src/open_file_description.cpp"
 )
 
 target_sources("kernel_filesystem" PUBLIC
     FILE_SET HEADERS
     BASE_DIRS "include"
     FILES
-    "include/filesystem/file.hpp"
     "include/filesystem/device_file.hpp"
-    "include/filesystem/open_file_description.hpp"
     "include/filesystem/file_descriptor_table.hpp"
+    "include/filesystem/file.hpp"
+    "include/filesystem/inode_file.hpp"
+    "include/filesystem/inode.hpp"
+    "include/filesystem/open_file_description.hpp"
 )
 
 target_include_directories("kernel_filesystem" PUBLIC
diff --git a/kernel/filesystem/include/filesystem/inode.hpp b/kernel/filesystem/include/filesystem/inode.hpp
new file mode 100644
index 0000000..44ec09a
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/inode.hpp
@@ -0,0 +1,14 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_INODE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_INODE_HPP
+
+#include <cstddef>
+namespace filesystem
+{
+  struct inode
+  {
+    auto read(void * buffer, size_t offset, size_t size) const -> size_t;
+    auto write(void const * buffer, size_t offset, size_t size) -> size_t;
+  };
+}  // namespace filesystem
+
+#endif
diff --git a/kernel/filesystem/include/filesystem/inode_file.hpp b/kernel/filesystem/include/filesystem/inode_file.hpp
new file mode 100644
index 0000000..c091280
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/inode_file.hpp
@@ -0,0 +1,25 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_INODE_FILE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_INODE_FILE_HPP
+
+#include "filesystem/file.hpp"
+#include "filesystem/inode.hpp"
+
+#include <cstddef>
+
+namespace filesystem
+{
+  struct inode_file : file
+  {
+    explicit inode_file(inode * inode);
+
+    auto open() -> void override;
+
+    auto read(void * buffer, size_t offset, size_t size) const -> size_t override;
+    auto write(void const * buffer, size_t offset, size_t size) -> size_t override;
+
+  private:
+    inode * m_inode;
+  };
+}  // namespace filesystem
+
+#endif
\ No newline at end of file
diff --git a/kernel/filesystem/src/inode.cpp b/kernel/filesystem/src/inode.cpp
new file mode 100644
index 0000000..7bca507
--- /dev/null
+++ b/kernel/filesystem/src/inode.cpp
@@ -0,0 +1,20 @@
+#include "filesystem/inode.hpp"
+
+#include "kapi/system.hpp"
+
+#include <cstddef>
+
+namespace filesystem
+{
+  auto inode::read(void * /*buffer*/, size_t /*offset*/, size_t /*size*/) const -> size_t
+  {
+    // TODO BA-FS26
+    return 0;
+  }
+
+  auto inode::write(void const *, size_t, size_t) -> size_t
+  {
+    kapi::system::panic("[FILESYSTEM] inode::write is not implemented yet");
+    return 0;
+  }
+}  // namespace filesystem
\ No newline at end of file
diff --git a/kernel/filesystem/src/inode_file.cpp b/kernel/filesystem/src/inode_file.cpp
new file mode 100644
index 0000000..071661f
--- /dev/null
+++ b/kernel/filesystem/src/inode_file.cpp
@@ -0,0 +1,33 @@
+#include "filesystem/inode_file.hpp"
+
+#include "kapi/system.hpp"
+
+#include "filesystem/inode.hpp"
+
+#include <cstddef>
+
+namespace filesystem
+{
+  inode_file::inode_file(inode * inode)
+      : m_inode(inode)
+  {
+    if (!m_inode)
+    {
+      kapi::system::panic("[FILESYSTEM] inode_file constructed with null inode");
+    }
+  }
+
+  auto inode_file::open() -> void
+  {
+    // Hook point for permission checks or lazy metadata loading.
+  }
+
+  auto inode_file::read(void * buffer, size_t offset, size_t size) const -> size_t
+  {
+    return m_inode->read(buffer, offset, size);
+  }
+  auto inode_file::write(void const * buffer, size_t offset, size_t size) -> size_t
+  {
+    return m_inode->write(buffer, offset, size);
+  }
+}  // namespace filesystem
\ No newline at end of file