37 static struct mount *get_peer_under_root(struct mount *mnt,  in get_peer_under_root()  argument
41 	struct mount *m = mnt;  in get_peer_under_root()
45 		if (m->mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))  in get_peer_under_root()
49 	} while (m != mnt);  in get_peer_under_root()
60 int get_dominating_id(struct mount *mnt, const struct path *root)  in get_dominating_id()  argument
64 	for (m = mnt->mnt_master; m != NULL; m = m->mnt_master) {  in get_dominating_id()
65 		struct mount *d = get_peer_under_root(m, mnt->mnt_ns, root);  in get_dominating_id()
73 static int do_make_slave(struct mount *mnt)  in do_make_slave()  argument
77 	if (list_empty(&mnt->mnt_share)) {  in do_make_slave()
78 		if (IS_MNT_SHARED(mnt)) {  in do_make_slave()
79 			mnt_release_group_id(mnt);  in do_make_slave()
80 			CLEAR_MNT_SHARED(mnt);  in do_make_slave()
82 		master = mnt->mnt_master;  in do_make_slave()
84 			struct list_head *p = &mnt->mnt_slave_list;  in do_make_slave()
100 		for (m = master = next_peer(mnt); m != mnt; m = next_peer(m)) {  in do_make_slave()
101 			if (m->mnt.mnt_root == mnt->mnt.mnt_root) {  in do_make_slave()
106 		list_del_init(&mnt->mnt_share);  in do_make_slave()
107 		mnt->mnt_group_id = 0;  in do_make_slave()
108 		CLEAR_MNT_SHARED(mnt);  in do_make_slave()
110 	list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave)  in do_make_slave()
112 	list_move(&mnt->mnt_slave, &master->mnt_slave_list);  in do_make_slave()
113 	list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev);  in do_make_slave()
114 	INIT_LIST_HEAD(&mnt->mnt_slave_list);  in do_make_slave()
115 	mnt->mnt_master = master;  in do_make_slave()
122 void change_mnt_propagation(struct mount *mnt, int type)  in change_mnt_propagation()  argument
125 		set_mnt_shared(mnt);  in change_mnt_propagation()
128 	do_make_slave(mnt);  in change_mnt_propagation()
130 		list_del_init(&mnt->mnt_slave);  in change_mnt_propagation()
131 		mnt->mnt_master = NULL;  in change_mnt_propagation()
133 			mnt->mnt.mnt_flags |= MNT_UNBINDABLE;  in change_mnt_propagation()
135 			mnt->mnt.mnt_flags &= ~MNT_UNBINDABLE;  in change_mnt_propagation()
233 	if (!is_subdir(mp->m_dentry, m->mnt.mnt_root))  in propagate_one()
261 	child = copy_tree(last_source, last_source->mnt.mnt_root, type);  in propagate_one()
337 static struct mount *find_topper(struct mount *mnt)  in find_topper()  argument
342 	if (!list_is_singular(&mnt->mnt_mounts))  in find_topper()
345 	child = list_first_entry(&mnt->mnt_mounts, struct mount, mnt_child);  in find_topper()
346 	if (child->mnt_mountpoint != mnt->mnt.mnt_root)  in find_topper()
355 static inline int do_refcount_check(struct mount *mnt, int count)  in do_refcount_check()  argument
357 	return mnt_get_count(mnt) > count;  in do_refcount_check()
370 int propagate_mount_busy(struct mount *mnt, int refcnt)  in propagate_mount_busy()  argument
373 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_busy()
375 	if (mnt == parent)  in propagate_mount_busy()
376 		return do_refcount_check(mnt, refcnt);  in propagate_mount_busy()
383 	if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))  in propagate_mount_busy()
389 		child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_busy()
413 void propagate_mount_unlock(struct mount *mnt)  in propagate_mount_unlock()  argument
415 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_unlock()
418 	BUG_ON(parent == mnt);  in propagate_mount_unlock()
422 		child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_unlock()
424 			child->mnt.mnt_flags &= ~MNT_LOCKED;  in propagate_mount_unlock()
428 static void umount_one(struct mount *mnt, struct list_head *to_umount)  in umount_one()  argument
430 	CLEAR_MNT_MARK(mnt);  in umount_one()
431 	mnt->mnt.mnt_flags |= MNT_UMOUNT;  in umount_one()
432 	list_del_init(&mnt->mnt_child);  in umount_one()
433 	list_del_init(&mnt->mnt_umounting);  in umount_one()
434 	list_move_tail(&mnt->mnt_list, to_umount);  in umount_one()
441 static bool __propagate_umount(struct mount *mnt,  in __propagate_umount()  argument
452 	if (mnt->mnt.mnt_flags & (MNT_UMOUNT | MNT_MARKED))  in __propagate_umount()
458 	list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) {  in __propagate_umount()
459 		if (child->mnt_mountpoint == mnt->mnt.mnt_root)  in __propagate_umount()
468 	SET_MNT_MARK(mnt);  in __propagate_umount()
472 	if (!IS_MNT_LOCKED(mnt)) {  in __propagate_umount()
473 		umount_one(mnt, to_umount);  in __propagate_umount()
476 		list_move_tail(&mnt->mnt_umounting, to_restore);  in __propagate_umount()
485 	struct mount *mnt, *child, *tmp;  in umount_list()  local
486 	list_for_each_entry(mnt, to_umount, mnt_list) {  in umount_list()
487 		list_for_each_entry_safe(child, tmp, &mnt->mnt_mounts, mnt_child) {  in umount_list()
489 			if (child->mnt_mountpoint == mnt->mnt.mnt_root)  in umount_list()
501 		struct mount *mnt, *parent;  in restore_mounts()  local
504 		mnt = list_first_entry(to_restore, struct mount, mnt_umounting);  in restore_mounts()
505 		CLEAR_MNT_MARK(mnt);  in restore_mounts()
506 		list_del_init(&mnt->mnt_umounting);  in restore_mounts()
509 		mp = mnt->mnt_mp;  in restore_mounts()
510 		parent = mnt->mnt_parent;  in restore_mounts()
511 		while (parent->mnt.mnt_flags & MNT_UMOUNT) {  in restore_mounts()
515 		if (parent != mnt->mnt_parent)  in restore_mounts()
516 			mnt_change_mountpoint(parent, mp, mnt);  in restore_mounts()
523 		struct mount *mnt =  in cleanup_umount_visitations()  local
525 		list_del_init(&mnt->mnt_umounting);  in cleanup_umount_visitations()
538 	struct mount *mnt;  in propagate_umount()  local
544 	list_for_each_entry_reverse(mnt, list, mnt_list) {  in propagate_umount()
545 		struct mount *parent = mnt->mnt_parent;  in propagate_umount()
554 		if (!list_empty(&mnt->mnt_umounting))  in propagate_umount()
557 		list_add_tail(&mnt->mnt_umounting, &visited);  in propagate_umount()
560 			struct mount *child = __lookup_mnt(&m->mnt,  in propagate_umount()
561 							   mnt->mnt_mountpoint);  in propagate_umount()
575 			} else if (child->mnt.mnt_flags & MNT_UMOUNT) {  in propagate_umount()