text: #ifndef FILESYS_FILESYS_H
  #define FILESYS_FILESYS_H
  
  #include <stdbool.h>
  #include "filesys/off_t.h"
  
  /* Block device that contains the file system. */
  struct block *fs_device;
  
  void filesys_init (bool format);
  void filesys_done (void);
  bool filesys_create (const char *name, off_t initial_size);
  bool filesys_mkdir (const char *path);
  struct file *filesys_open (const char *name);
  bool filesys_remove (const char *name);
  
  #endif /* filesys/filesys.h */
  