123     fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {  in open()  argument
132     fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {  in close()  argument
152     ) -> Result<usize, SystemError>;  in read_at()  argument
169     ) -> Result<usize, SystemError>;  in write_at()  argument
174     fn poll(&self, _private_data: &FilePrivateData) -> Result<usize, SystemError> {  in poll()  argument
183     fn metadata(&self) -> Result<Metadata, SystemError> {  in metadata()  argument
192     fn set_metadata(&self, _metadata: &Metadata) -> Result<(), SystemError> {  in set_metadata()  argument
204     fn resize(&self, _len: usize) -> Result<(), SystemError> {  in resize()  argument
222     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create()  argument
242     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create_with_data()  argument
254     fn link(&self, _name: &str, _other: &Arc<dyn IndexNode>) -> Result<(), SystemError> {  in link()  argument
265     fn unlink(&self, _name: &str) -> Result<(), SystemError> {  in unlink()  argument
276     fn rmdir(&self, _name: &str) -> Result<(), SystemError> {  in rmdir()  argument
295     ) -> Result<(), SystemError> {  in move_()  argument
306     fn find(&self, _name: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in find()  argument
317     fn get_entry_name(&self, _ino: InodeId) -> Result<String, SystemError> {  in get_entry_name()  argument
328     fn get_entry_name_and_metadata(&self, ino: InodeId) -> Result<(String, Metadata), SystemError> {  in get_entry_name_and_metadata()  argument
347     ) -> Result<usize, SystemError> {  in ioctl()  argument
360     fn list(&self) -> Result<Vec<String>, SystemError>;  in list()  argument
364     fn mount(&self, _fs: Arc<dyn FileSystem>) -> Result<Arc<MountFS>, SystemError> {  in mount()  argument
371     fn truncate(&self, _len: usize) -> Result<(), SystemError> {  in truncate()  argument
376     fn sync(&self) -> Result<(), SystemError> {  in sync()  argument
388     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in mknod()  argument
417     pub fn lookup(&self, path: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in lookup()  argument
432     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in lookup_follow_symlink()  argument