36 static bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,  in is_path_reachable()  argument
39 	while (mnt != root->mnt && mnt->mnt_parent != mnt) {  in is_path_reachable()
40 		dentry = mnt->mnt_mountpoint;  in is_path_reachable()
41 		mnt = mnt->mnt_parent;  in is_path_reachable()
43 	return mnt == root->mnt && is_subdir(dentry, root->dentry);  in is_path_reachable()
46 static struct vfsmount *get_peer_under_root(struct vfsmount *mnt,  in get_peer_under_root()  argument
50 	struct vfsmount *m = mnt;  in get_peer_under_root()
58 	} while (m != mnt);  in get_peer_under_root()
69 int get_dominating_id(struct vfsmount *mnt, const struct path *root)  in get_dominating_id()  argument
73 	for (m = mnt->mnt_master; m != NULL; m = m->mnt_master) {  in get_dominating_id()
74 		struct vfsmount *d = get_peer_under_root(m, mnt->mnt_ns, root);  in get_dominating_id()
82 static int do_make_slave(struct vfsmount *mnt)  in do_make_slave()  argument
84 	struct vfsmount *peer_mnt = mnt, *master = mnt->mnt_master;  in do_make_slave()
92 	while ((peer_mnt = next_peer(peer_mnt)) != mnt &&  in do_make_slave()
93 	       peer_mnt->mnt_root != mnt->mnt_root) ;  in do_make_slave()
95 	if (peer_mnt == mnt) {  in do_make_slave()
96 		peer_mnt = next_peer(mnt);  in do_make_slave()
97 		if (peer_mnt == mnt)  in do_make_slave()
100 	if (IS_MNT_SHARED(mnt) && list_empty(&mnt->mnt_share))  in do_make_slave()
101 		mnt_release_group_id(mnt);  in do_make_slave()
103 	list_del_init(&mnt->mnt_share);  in do_make_slave()
104 	mnt->mnt_group_id = 0;  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()
116 		struct list_head *p = &mnt->mnt_slave_list;  in do_make_slave()
124 	mnt->mnt_master = master;  in do_make_slave()
125 	CLEAR_MNT_SHARED(mnt);  in do_make_slave()
129 void change_mnt_propagation(struct vfsmount *mnt, int type)  in change_mnt_propagation()  argument
132 		set_mnt_shared(mnt);  in change_mnt_propagation()
135 	do_make_slave(mnt);  in change_mnt_propagation()
137 		list_del_init(&mnt->mnt_slave);  in change_mnt_propagation()
138 		mnt->mnt_master = NULL;  in change_mnt_propagation()
140 			mnt->mnt_flags |= MNT_UNBINDABLE;  in change_mnt_propagation()
142 			mnt->mnt_flags &= ~MNT_UNBINDABLE;  in change_mnt_propagation()
280 static inline int do_refcount_check(struct vfsmount *mnt, int count)  in do_refcount_check()  argument
282 	int mycount = atomic_read(&mnt->mnt_count) - mnt->mnt_ghosts;  in do_refcount_check()
294 int propagate_mount_busy(struct vfsmount *mnt, int refcnt)  in propagate_mount_busy()  argument
297 	struct vfsmount *parent = mnt->mnt_parent;  in propagate_mount_busy()
300 	if (mnt == parent)  in propagate_mount_busy()
301 		return do_refcount_check(mnt, refcnt);  in propagate_mount_busy()
308 	if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))  in propagate_mount_busy()
313 		child = __lookup_mnt(m, mnt->mnt_mountpoint, 0);  in propagate_mount_busy()
325 static void __propagate_umount(struct vfsmount *mnt)  in __propagate_umount()  argument
327 	struct vfsmount *parent = mnt->mnt_parent;  in __propagate_umount()
330 	BUG_ON(parent == mnt);  in __propagate_umount()
336 					mnt->mnt_mountpoint, 0);  in __propagate_umount()
342 			list_move_tail(&child->mnt_hash, &mnt->mnt_hash);  in __propagate_umount()
353 	struct vfsmount *mnt;  in propagate_umount()  local
355 	list_for_each_entry(mnt, list, mnt_hash)  in propagate_umount()
356 		__propagate_umount(mnt);  in propagate_umount()