14 use crate::{libs::casting::DowncastArc, syscall::SystemError, time::TimeSpec};
93     fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {  in open()  argument
95         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in open()
102     fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {  in close()  argument
104         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in close()
122     ) -> Result<usize, SystemError>;  in read_at()  argument
139     ) -> Result<usize, SystemError>;  in write_at()  argument
144     fn poll(&self) -> Result<PollStatus, SystemError>;  in poll()  argument
150     fn metadata(&self) -> Result<Metadata, SystemError> {  in metadata()  argument
152         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in metadata()
159     fn set_metadata(&self, _metadata: &Metadata) -> Result<(), SystemError> {  in set_metadata()  argument
161         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in set_metadata()
171     fn resize(&self, _len: usize) -> Result<(), SystemError> {  in resize()  argument
173         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in resize()
189     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create()  argument
209     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create_with_data()  argument
211         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in create_with_data()
221     fn link(&self, _name: &str, _other: &Arc<dyn IndexNode>) -> Result<(), SystemError> {  in link()  argument
223         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in link()
232     fn unlink(&self, _name: &str) -> Result<(), SystemError> {  in unlink()  argument
234         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in unlink()
243     fn rmdir(&self, _name: &str) -> Result<(), SystemError> {  in rmdir()  argument
244         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in rmdir()
262     ) -> Result<(), SystemError> {  in move_()  argument
264         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in move_()
273     fn find(&self, _name: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in find()  argument
275         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in find()
284     fn get_entry_name(&self, _ino: InodeId) -> Result<String, SystemError> {  in get_entry_name()  argument
286         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in get_entry_name()
295     fn get_entry_name_and_metadata(&self, ino: InodeId) -> Result<(String, Metadata), SystemError> {  in get_entry_name_and_metadata()  argument
309     fn ioctl(&self, _cmd: u32, _data: usize) -> Result<usize, SystemError> {  in ioctl()  argument
311         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in ioctl()
322     fn list(&self) -> Result<Vec<String>, SystemError>;  in list()  argument
326     fn mount(&self, _fs: Arc<dyn FileSystem>) -> Result<Arc<MountFS>, SystemError> {  in mount()  argument
327         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in mount()
333     fn truncate(&self, _len: usize) -> Result<(), SystemError> {  in truncate()  argument
334         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in truncate()
338     fn sync(&self) -> Result<(), SystemError> {  in sync()  argument
362     pub fn lookup(&self, path: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in lookup()  argument
377     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in lookup_follow_symlink()  argument
379             return Err(SystemError::ENOTDIR);  in lookup_follow_symlink()
396                 return Err(SystemError::ENOTDIR);  in lookup_follow_symlink()
430                     ::core::str::from_utf8(&content[..len]).map_err(|_| SystemError::ENOTDIR)?,  in lookup_follow_symlink()