Volume-centric VFS implementation

kernel/proc/procgroup.h

@@ -36,8 +36,6 @@ struct procgroup {
   uintptr_t map_base;
   struct procgroup_tls tls;
   uint64_t capabilities;
-  struct rb_node_link* vfs_handle_tree;
-  struct id_alloc vfs_handle_id_alloc;
 };
 
 struct procgroup* procgroup_create (void);