37 pub struct MountFS {  struct
41     mountpoints: SpinLock<BTreeMap<InodeId, Arc<MountFS>>>,  argument
45     self_ref: Weak<MountFS>,  argument
55     mount_fs: Arc<MountFS>,
60 impl MountFS {  impl
65         return Arc::new_cyclic(|self_ref| MountFS {  in new()
80         let mount_fs: Arc<MountFS> = Arc::new(self);  in wrap()
82         let weak: Weak<MountFS> = Arc::downgrade(&mount_fs);  in wrap()
85         let ptr: *mut MountFS = mount_fs.as_ref() as *const Self as *mut Self;  in wrap()
113     pub fn umount(&self) -> Result<Arc<MountFS>, SystemError> {  in umount()  argument
206     fn do_umount(&self) -> Result<Arc<MountFS>, SystemError> {  in do_umount()  argument
407     fn mount(&self, fs: Arc<dyn FileSystem>) -> Result<Arc<MountFS>, SystemError> {  in mount()  argument
420             .downcast_arc::<MountFS>()  in mount()
423         let new_mount_fs = MountFS::new(to_mount_fs, Some(self.self_ref.upgrade().unwrap()));  in mount()
435     fn mount_from(&self, from: Arc<dyn IndexNode>) -> Result<Arc<MountFS>, SystemError> {  in mount_from()  argument
455     fn umount(&self) -> Result<Arc<MountFS>, SystemError> {  in umount()  argument
513 impl FileSystem for MountFS {  implementation
605 pub struct MountList(RwLock<BTreeMap<MountPath, Arc<MountFS>>>);
657     pub fn insert<T: AsRef<str>>(&self, path: T, fs: Arc<MountFS>) {  in insert()  argument
679     ) -> Option<(String, String, Arc<MountFS>)> {  in get_mount_point()  argument
707     pub fn remove<T: Into<MountPath>>(&self, path: T) -> Option<Arc<MountFS>> {  in remove()  argument