32 static struct mount *get_peer_under_root(struct mount *mnt,  in get_peer_under_root()  argument
36 	struct mount *m = mnt;  in get_peer_under_root()
40 		if (m->mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))  in get_peer_under_root()
44 	} while (m != mnt);  in get_peer_under_root()
55 int get_dominating_id(struct mount *mnt, const struct path *root)  in get_dominating_id()  argument
59 	for (m = mnt->mnt_master; m != NULL; m = m->mnt_master) {  in get_dominating_id()
60 		struct mount *d = get_peer_under_root(m, mnt->mnt_ns, root);  in get_dominating_id()
68 static int do_make_slave(struct mount *mnt)  in do_make_slave()  argument
70 	struct mount *peer_mnt = mnt, *master = mnt->mnt_master;  in do_make_slave()
78 	while ((peer_mnt = next_peer(peer_mnt)) != mnt &&  in do_make_slave()
79 	       peer_mnt->mnt.mnt_root != mnt->mnt.mnt_root) ;  in do_make_slave()
81 	if (peer_mnt == mnt) {  in do_make_slave()
82 		peer_mnt = next_peer(mnt);  in do_make_slave()
83 		if (peer_mnt == mnt)  in do_make_slave()
86 	if (mnt->mnt_group_id && IS_MNT_SHARED(mnt) &&  in do_make_slave()
87 	    list_empty(&mnt->mnt_share))  in do_make_slave()
88 		mnt_release_group_id(mnt);  in do_make_slave()
90 	list_del_init(&mnt->mnt_share);  in do_make_slave()
91 	mnt->mnt_group_id = 0;  in do_make_slave()
97 		list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave)  in do_make_slave()
99 		list_move(&mnt->mnt_slave, &master->mnt_slave_list);  in do_make_slave()
100 		list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev);  in do_make_slave()
101 		INIT_LIST_HEAD(&mnt->mnt_slave_list);  in do_make_slave()
103 		struct list_head *p = &mnt->mnt_slave_list;  in do_make_slave()
111 	mnt->mnt_master = master;  in do_make_slave()
112 	CLEAR_MNT_SHARED(mnt);  in do_make_slave()
119 void change_mnt_propagation(struct mount *mnt, int type)  in change_mnt_propagation()  argument
122 		set_mnt_shared(mnt);  in change_mnt_propagation()
125 	do_make_slave(mnt);  in change_mnt_propagation()
127 		list_del_init(&mnt->mnt_slave);  in change_mnt_propagation()
128 		mnt->mnt_master = NULL;  in change_mnt_propagation()
130 			mnt->mnt.mnt_flags |= MNT_UNBINDABLE;  in change_mnt_propagation()
132 			mnt->mnt.mnt_flags &= ~MNT_UNBINDABLE;  in change_mnt_propagation()
218 	if (!is_subdir(mp->m_dentry, m->mnt.mnt_root))  in propagate_one()
249 	child = copy_tree(last_source, last_source->mnt.mnt_root, type);  in propagate_one()
252 	child->mnt.mnt_flags &= ~MNT_LOCKED;  in propagate_one()
330 static inline int do_refcount_check(struct mount *mnt, int count)  in do_refcount_check()  argument
332 	return mnt_get_count(mnt) > count;  in do_refcount_check()
345 int propagate_mount_busy(struct mount *mnt, int refcnt)  in propagate_mount_busy()  argument
348 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_busy()
351 	if (mnt == parent)  in propagate_mount_busy()
352 		return do_refcount_check(mnt, refcnt);  in propagate_mount_busy()
359 	if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))  in propagate_mount_busy()
364 		child = __lookup_mnt_last(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_busy()
377 void propagate_mount_unlock(struct mount *mnt)  in propagate_mount_unlock()  argument
379 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_unlock()
382 	BUG_ON(parent == mnt);  in propagate_mount_unlock()
386 		child = __lookup_mnt_last(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_unlock()
388 			child->mnt.mnt_flags &= ~MNT_LOCKED;  in propagate_mount_unlock()
395 static void mark_umount_candidates(struct mount *mnt)  in mark_umount_candidates()  argument
397 	struct mount *parent = mnt->mnt_parent;  in mark_umount_candidates()
400 	BUG_ON(parent == mnt);  in mark_umount_candidates()
404 		struct mount *child = __lookup_mnt_last(&m->mnt,  in mark_umount_candidates()
405 						mnt->mnt_mountpoint);  in mark_umount_candidates()
416 static void __propagate_umount(struct mount *mnt)  in __propagate_umount()  argument
418 	struct mount *parent = mnt->mnt_parent;  in __propagate_umount()
421 	BUG_ON(parent == mnt);  in __propagate_umount()
426 		struct mount *child = __lookup_mnt_last(&m->mnt,  in __propagate_umount()
427 						mnt->mnt_mountpoint);  in __propagate_umount()
437 			child->mnt.mnt_flags |= MNT_UMOUNT;  in __propagate_umount()
438 			list_move_tail(&child->mnt_list, &mnt->mnt_list);  in __propagate_umount()
452 	struct mount *mnt;  in propagate_umount()  local
454 	list_for_each_entry_reverse(mnt, list, mnt_list)  in propagate_umount()
455 		mark_umount_candidates(mnt);  in propagate_umount()
457 	list_for_each_entry(mnt, list, mnt_list)  in propagate_umount()
458 		__propagate_umount(mnt);  in propagate_umount()