13     syscall::SystemError,
102     ) -> Result<(), SystemError> {  in register_device()  argument
141                 return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in register_device()
153     ) -> Result<(), SystemError> {  in unregister_device()  argument
159                     return Err(SystemError::ENOENT);  in unregister_device()
172                     return Err(SystemError::ENOENT);  in unregister_device()
184                 return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in unregister_device()
248     pub fn add_dir(&self, name: &str) -> Result<(), SystemError> {  in add_dir()  argument
252             return Err(SystemError::EEXIST);  in add_dir()
265     pub fn add_dev(&self, name: &str, dev: Arc<dyn IndexNode>) -> Result<(), SystemError> {  in add_dev()  argument
269             return Err(SystemError::EEXIST);  in add_dev()
276     pub fn remove(&self, name: &str) -> Result<(), SystemError> {  in remove()  argument
282             .ok_or(SystemError::ENOENT)?;  in remove()
295     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in do_create_with_data()  argument
297             return Err(SystemError::ENOTDIR);  in do_create_with_data()
302             return Err(SystemError::EEXIST);  in do_create_with_data()
347     ) -> Result<(), SystemError> {  in open()  argument
351     fn close(&self, _data: &mut super::vfs::FilePrivateData) -> Result<(), SystemError> {  in close()  argument
361     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create_with_data()  argument
368     fn find(&self, name: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in find()  argument
372             return Err(SystemError::ENOTDIR);  in find()
377                 return Ok(inode.self_ref.upgrade().ok_or(SystemError::ENOENT)?);  in find()
380                 return Ok(inode.parent.upgrade().ok_or(SystemError::ENOENT)?);  in find()
384                 return Ok(inode.children.get(name).ok_or(SystemError::ENOENT)?.clone());  in find()
393     fn get_entry_name(&self, ino: super::vfs::InodeId) -> Result<String, SystemError> {  in get_entry_name()  argument
396             return Err(SystemError::ENOTDIR);  in get_entry_name()
417                     0=>{return Err(SystemError::ENOENT);}  in get_entry_name()
425     fn ioctl(&self, _cmd: u32, _data: usize) -> Result<usize, SystemError> {  in ioctl()  argument
426         Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)  in ioctl()
429     fn list(&self) -> Result<Vec<String>, SystemError> {  in list()  argument
432             return Err(SystemError::ENOTDIR);  in list()
443     fn metadata(&self) -> Result<Metadata, SystemError> {  in metadata()  argument
447     fn set_metadata(&self, metadata: &Metadata) -> Result<(), SystemError> {  in set_metadata()  argument
459     fn poll(&self) -> Result<super::vfs::PollStatus, SystemError> {  in poll()  argument
465             return Err(SystemError::EISDIR);  in poll()
478     ) -> Result<usize, SystemError> {  in read_at()  argument
480         Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)  in read_at()
490     ) -> Result<usize, SystemError> {  in write_at()  argument
491         Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)  in write_at()
504         let devfs_inode: Result<Arc<dyn IndexNode>, SystemError> = ROOT_INODE().find("dev");
507             return Err(SystemError::ENOENT);
523 pub fn devfs_register<T: DeviceINode>(name: &str, device: Arc<T>) -> Result<(), SystemError> {  in devfs_register()  argument
529 pub fn devfs_unregister<T: DeviceINode>(name: &str, device: Arc<T>) -> Result<(), SystemError> {  in devfs_unregister()  argument