103         let dev_root_inode: Arc<LockedDevFSInode> = self.root_inode.clone();  in register_device()  localVariable
108                 if let Err(_) = dev_root_inode.find("char") {  in register_device()
109                     dev_root_inode.create("char", FileType::Dir, 0o755)?;  in register_device()
112                 let any_char_inode = dev_root_inode.find("char")?;  in register_device()
122                     dev_root_inode.add_dev(name, device.clone())?;  in register_device()
127                 if let Err(_) = dev_root_inode.find("block") {  in register_device()
128                     dev_root_inode.create("block", FileType::Dir, 0o755)?;  in register_device()
131                 let any_block_inode = dev_root_inode.find("block")?;  in register_device()
154         let dev_root_inode: Arc<LockedDevFSInode> = self.root_inode.clone();  in unregister_device()  localVariable
158                 if let Err(_) = dev_root_inode.find("char") {  in unregister_device()
162                 let any_char_inode = dev_root_inode.find("char")?;  in unregister_device()
171                 if let Err(_) = dev_root_inode.find("block") {  in unregister_device()
175                 let any_block_inode = dev_root_inode.find("block")?;  in unregister_device()