Add basic structure for ext2_filesystem, filesystem and mount

7 files changed, 128 insertions, 0 deletions

diff --git a/kernel/filesystem/CMakeLists.txt b/kernel/filesystem/CMakeLists.txt
index a1c625e..a6b4e49 100644
--- a/kernel/filesystem/CMakeLists.txt
+++ b/kernel/filesystem/CMakeLists.txt
@@ -3,9 +3,12 @@ add_library("kernel::filesystem" ALIAS "kernel_filesystem")
 
 target_sources("kernel_filesystem" PRIVATE
     "src/device_file.cpp"
+    "src/ext2/ext2_filesystem.cpp"
     "src/file_descriptor_table.cpp"
+    "src/filesystem.cpp"
     "src/inode_file.cpp"
     "src/inode.cpp"
+    "src/mount.cpp"
     "src/open_file_description.cpp"
     "src/vfs.cpp"
 )
@@ -15,10 +18,13 @@ target_sources("kernel_filesystem" PUBLIC
     BASE_DIRS "include"
     FILES
     "include/filesystem/device_file.hpp"
+    "include/filesystem/ext2/ext2_filesystem.hpp"
     "include/filesystem/file_descriptor_table.hpp"
     "include/filesystem/file.hpp"
+    "include/filesystem/filesystem.hpp"
     "include/filesystem/inode_file.hpp"
     "include/filesystem/inode.hpp"
+    "include/filesystem/mount.hpp"
     "include/filesystem/open_file_description.hpp"
     "include/filesystem/vfs.hpp"
 )
diff --git a/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp b/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp
new file mode 100644
index 0000000..0027475
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/ext2/ext2_filesystem.hpp
@@ -0,0 +1,18 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_EXT2_FILESYSTEM_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_EXT2_FILESYSTEM_HPP
+
+#include "devices/block_device.hpp"
+#include "filesystem/filesystem.hpp"
+
+namespace filesystem::ext2
+{
+  struct ext2_filesystem : filesystem
+  {
+    auto mount(devices::block_device * block_device) -> int override;
+
+  private:
+    devices::block_device * m_block_device{};
+  };
+}  // namespace filesystem::ext2
+
+#endif
diff --git a/kernel/filesystem/include/filesystem/filesystem.hpp b/kernel/filesystem/include/filesystem/filesystem.hpp
new file mode 100644
index 0000000..d5704c1
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/filesystem.hpp
@@ -0,0 +1,23 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_FILESYSTEM_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_FILESYSTEM_HPP
+
+#include "devices/block_device.hpp"
+#include "filesystem/inode.hpp"
+
+namespace filesystem
+{
+  struct filesystem
+  {
+    virtual ~filesystem() = default;
+
+    virtual auto mount(devices::block_device * block_device) -> int = 0;
+
+    auto root_inode() -> inode *;
+
+  protected:
+    inode * m_root_inode{};  // TODO BA-FS26 set during mount?
+  };
+
+}  // namespace filesystem
+
+#endif
\ No newline at end of file
diff --git a/kernel/filesystem/include/filesystem/mount.hpp b/kernel/filesystem/include/filesystem/mount.hpp
new file mode 100644
index 0000000..793c042
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/mount.hpp
@@ -0,0 +1,24 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_MOUNT_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_MOUNT_HPP
+
+#include "filesystem/filesystem.hpp"
+
+#include <string_view>
+
+namespace filesystem
+{
+  struct mount
+  {
+    mount() = default;  // TODO BA-FS26 remove again when kstd::vector is available and used in vfs
+    mount(std::string_view const & path, filesystem * fs);
+
+    auto path() const -> std::string_view;
+    auto get_filesystem() const -> filesystem *;
+
+  private:
+    std::string_view m_path;
+    filesystem * m_filesystem{};
+  };
+}  // namespace filesystem
+
+#endif
diff --git a/kernel/filesystem/src/ext2/ext2_filesystem.cpp b/kernel/filesystem/src/ext2/ext2_filesystem.cpp
new file mode 100644
index 0000000..bdd430d
--- /dev/null
+++ b/kernel/filesystem/src/ext2/ext2_filesystem.cpp
@@ -0,0 +1,16 @@
+#include "filesystem/ext2/ext2_filesystem.hpp"
+
+#include "devices/block_device.hpp"
+
+namespace filesystem::ext2
+{
+  auto ext2_filesystem::mount(devices::block_device * block_device) -> int
+  {
+    if (!block_device)
+    {
+      return -1;  // TODO BA-FS26 panic or errorcode?
+    }
+    // TODO BA-FS26 implement
+    return 0;
+  }
+}  // namespace filesystem::ext2
\ No newline at end of file
diff --git a/kernel/filesystem/src/filesystem.cpp b/kernel/filesystem/src/filesystem.cpp
new file mode 100644
index 0000000..d6a2f25
--- /dev/null
+++ b/kernel/filesystem/src/filesystem.cpp
@@ -0,0 +1,11 @@
+#include "filesystem/filesystem.hpp"
+
+#include "filesystem/inode.hpp"
+
+namespace filesystem
+{
+  auto filesystem::root_inode() -> inode *
+  {
+    return m_root_inode;
+  }
+}  // namespace filesystem
\ No newline at end of file
diff --git a/kernel/filesystem/src/mount.cpp b/kernel/filesystem/src/mount.cpp
new file mode 100644
index 0000000..6594598
--- /dev/null
+++ b/kernel/filesystem/src/mount.cpp
@@ -0,0 +1,30 @@
+#include "filesystem/mount.hpp"
+
+#include "kapi/system.hpp"
+
+#include "filesystem/filesystem.hpp"
+
+#include <string_view>
+
+namespace filesystem
+{
+  mount::mount(std::string_view const & path, filesystem * fs)
+      : m_path(path)
+      , m_filesystem(fs)
+  {
+    if (!m_filesystem)
+    {
+      kapi::system::panic("[FILESYSTEM] mount initialized with null filesystem.");
+    }
+  }
+
+  auto mount::path() const -> std::string_view
+  {
+    return m_path;
+  }
+
+  auto mount::get_filesystem() const -> filesystem *
+  {
+    return m_filesystem;
+  }
+}  // namespace filesystem
\ No newline at end of file