Create basic VFS structure

4 files changed, 61 insertions, 0 deletions

diff --git a/kernel/filesystem/CMakeLists.txt b/kernel/filesystem/CMakeLists.txt
index 126b54e..a1c625e 100644
--- a/kernel/filesystem/CMakeLists.txt
+++ b/kernel/filesystem/CMakeLists.txt
@@ -7,6 +7,7 @@ target_sources("kernel_filesystem" PRIVATE
     "src/inode_file.cpp"
     "src/inode.cpp"
     "src/open_file_description.cpp"
+    "src/vfs.cpp"
 )
 
 target_sources("kernel_filesystem" PUBLIC
@@ -19,6 +20,7 @@ target_sources("kernel_filesystem" PUBLIC
     "include/filesystem/inode_file.hpp"
     "include/filesystem/inode.hpp"
     "include/filesystem/open_file_description.hpp"
+    "include/filesystem/vfs.hpp"
 )
 
 target_include_directories("kernel_filesystem" PUBLIC
diff --git a/kernel/filesystem/include/filesystem/vfs.hpp b/kernel/filesystem/include/filesystem/vfs.hpp
new file mode 100644
index 0000000..671128e
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/vfs.hpp
@@ -0,0 +1,21 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_VFS_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_VFS_HPP
+
+#include <string_view>
+namespace filesystem
+{
+  struct vfs
+  {
+    auto static init() -> void;
+    auto static get() -> vfs &;
+
+    ~vfs() = default;
+
+    // auto do_mount(std::string_view const & path) ->
+
+  private:
+    vfs() = default;
+  };
+}  // namespace filesystem
+
+#endif
\ No newline at end of file
diff --git a/kernel/filesystem/src/vfs.cpp b/kernel/filesystem/src/vfs.cpp
new file mode 100644
index 0000000..27f1db9
--- /dev/null
+++ b/kernel/filesystem/src/vfs.cpp
@@ -0,0 +1,34 @@
+#include "filesystem/vfs.hpp"
+
+#include "kapi/system.hpp"
+
+#include <optional>
+
+namespace filesystem
+{
+  namespace
+  {
+    constinit auto static active_vfs = std::optional<vfs>{};
+  }
+
+  auto vfs::init() -> void
+  {
+    if (active_vfs)
+    {
+      kapi::system::panic("[FILESYSTEM] vfs has already been initialized.");
+    }
+
+    active_vfs.emplace(vfs{});
+  }
+
+  auto vfs::get() -> vfs &
+  {
+    if (!active_vfs)
+    {
+      kapi::system::panic("[FILESYSTEM] vfs has not been initialized.");
+    }
+
+    return *active_vfs;
+  }
+
+}  // namespace filesystem
\ No newline at end of file
diff --git a/kernel/src/main.cpp b/kernel/src/main.cpp
index 4b74bd4..07fb81b 100644
--- a/kernel/src/main.cpp
+++ b/kernel/src/main.cpp
@@ -5,6 +5,7 @@
 
 #include "devices/storage/storage_management.hpp"
 #include "filesystem/file_descriptor_table.hpp"
+#include "filesystem/vfs.hpp"
 
 #include "kernel/memory.hpp"
 
@@ -29,5 +30,8 @@ auto main() -> int
   filesystem::file_descriptor_table::init();
   kstd::println("[OS] Global file descriptor table initialized.");
 
+  filesystem::vfs::init();
+  kstd::println("[OS] Virtual filesystem initialized.");
+
   kapi::system::panic("Returning from kernel main!");
 }