15 pub struct MountFS {  struct
19     mountpoints: SpinLock<BTreeMap<InodeId, Arc<MountFS>>>,  argument
23     self_ref: Weak<MountFS>,  argument
32     mount_fs: Arc<MountFS>,
37 impl MountFS {  impl
42         return MountFS {  in new()
56         let mount_fs: Arc<MountFS> = Arc::new(self);  in wrap()
58         let weak: Weak<MountFS> = Arc::downgrade(&mount_fs);  in wrap()
61         let ptr: *mut MountFS = Arc::into_raw(mount_fs) as *mut Self;  in wrap()
323     fn mount(&self, fs: Arc<dyn FileSystem>) -> Result<Arc<MountFS>, SystemError> {  in mount()  argument
330         let new_mount_fs: Arc<MountFS> = MountFS::new(fs, Some(self.self_ref.upgrade().unwrap()));  in mount()
340 impl FileSystem for MountFS {  implementation