kernel: Rename FileSystem::root() to root_inode() and add a shortcut for the root filesystem's root inode

kernel/src/fs/VFS.cpp

@@ -3,4 +3,9 @@
 namespace VFS
 {
     SharedPtr<FileSystem> root_fs;
+
+    Inode& root_inode()
+    {
+        return root_fs->root_inode();
+    }
 }

kernel/src/fs/VFS.h

@@ -44,7 +44,7 @@ namespace VFS
     class FileSystem
     {
       public:
-        virtual Inode& root() const = 0;
+        virtual Inode& root_inode() const = 0;
 
         virtual Result<SharedPtr<Inode>> create_file_inode() = 0;
 
@@ -54,4 +54,6 @@ namespace VFS
     extern SharedPtr<FileSystem> root_fs;
 
     Result<Inode*> resolve_path(const char* path);
+
+    Inode& root_inode();
 }

kernel/src/fs/tmpfs/FileSystem.h

@@ -8,7 +8,7 @@ namespace TmpFS
     class FileSystem : public VFS::FileSystem
     {
       public:
-        VFS::Inode& root() const override
+        VFS::Inode& root_inode() const override
         {
             return *m_root_inode;
         }

kernel/src/main.cpp

@@ -58,7 +58,7 @@ Result<void> init()
 
     VFS::root_fs = TRY(TmpFS::FileSystem::create());
 
-    VFS::Inode& root_inode = VFS::root_fs->root();
+    VFS::Inode& root_inode = VFS::root_inode();
     kinfoln("root inode number: %zu", root_inode.inode_number());
 
     TarStream::Entry entry;