93     fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {  in open()
102     fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {  in close()
117         &self,  in read_at()
134         &self,  in write_at()
159     fn set_metadata(&self, _metadata: &Metadata) -> Result<(), SystemError> {  in set_metadata()
171     fn resize(&self, _len: usize) -> Result<(), SystemError> {  in resize()
185         &self,  in create()
204         &self,  in create_with_data()
221     fn link(&self, _name: &str, _other: &Arc<dyn IndexNode>) -> Result<(), SystemError> {  in link()
232     fn unlink(&self, _name: &str) -> Result<(), SystemError> {  in unlink()
243     fn rmdir(&self, _name: &str) -> Result<(), SystemError> {  in rmdir()
258         &self,  in move_()
273     fn find(&self, _name: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in find()
284     fn get_entry_name(&self, _ino: InodeId) -> Result<String, SystemError> {  in get_entry_name()
295     fn get_entry_name_and_metadata(&self, ino: InodeId) -> Result<(String, Metadata), SystemError> {  in get_entry_name_and_metadata()
309     fn ioctl(&self, _cmd: u32, _data: usize) -> Result<usize, SystemError> {  in ioctl()
326     fn mount(&self, _fs: Arc<dyn FileSystem>) -> Result<Arc<MountFS>, SystemError> {  in mount()
333     fn truncate(&self, _len: usize) -> Result<(), SystemError> {  in truncate()
362     pub fn lookup(&self, path: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in lookup()
374         &self,  in lookup_follow_symlink()