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
75 	struct mount *peer_mnt = mnt, *master = mnt->mnt_master;  in do_make_slave()
83 	while ((peer_mnt = next_peer(peer_mnt)) != mnt &&  in do_make_slave()
84 	       peer_mnt->mnt.mnt_root != mnt->mnt.mnt_root) ;  in do_make_slave()
86 	if (peer_mnt == mnt) {  in do_make_slave()
87 		peer_mnt = next_peer(mnt);  in do_make_slave()
88 		if (peer_mnt == mnt)  in do_make_slave()
91 	if (mnt->mnt_group_id && IS_MNT_SHARED(mnt) &&  in do_make_slave()
92 	    list_empty(&mnt->mnt_share))  in do_make_slave()
93 		mnt_release_group_id(mnt);  in do_make_slave()
95 	list_del_init(&mnt->mnt_share);  in do_make_slave()
96 	mnt->mnt_group_id = 0;  in do_make_slave()
102 		list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave)  in do_make_slave()
104 		list_move(&mnt->mnt_slave, &master->mnt_slave_list);  in do_make_slave()
105 		list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev);  in do_make_slave()
106 		INIT_LIST_HEAD(&mnt->mnt_slave_list);  in do_make_slave()
108 		struct list_head *p = &mnt->mnt_slave_list;  in do_make_slave()
116 	mnt->mnt_master = master;  in do_make_slave()
117 	CLEAR_MNT_SHARED(mnt);  in do_make_slave()
124 void change_mnt_propagation(struct mount *mnt, int type)  in change_mnt_propagation()  argument
127 		set_mnt_shared(mnt);  in change_mnt_propagation()
130 	do_make_slave(mnt);  in change_mnt_propagation()
132 		list_del_init(&mnt->mnt_slave);  in change_mnt_propagation()
133 		mnt->mnt_master = NULL;  in change_mnt_propagation()
135 			mnt->mnt.mnt_flags |= MNT_UNBINDABLE;  in change_mnt_propagation()
137 			mnt->mnt.mnt_flags &= ~MNT_UNBINDABLE;  in change_mnt_propagation()
236 	if (!is_subdir(mp->m_dentry, m->mnt.mnt_root))  in propagate_one()
267 	child = copy_tree(last_source, last_source->mnt.mnt_root, type);  in propagate_one()
270 	child->mnt.mnt_flags &= ~MNT_LOCKED;  in propagate_one()
344 static struct mount *find_topper(struct mount *mnt)  in find_topper()  argument
349 	if (!list_is_singular(&mnt->mnt_mounts))  in find_topper()
352 	child = list_first_entry(&mnt->mnt_mounts, struct mount, mnt_child);  in find_topper()
353 	if (child->mnt_mountpoint != mnt->mnt.mnt_root)  in find_topper()
362 static inline int do_refcount_check(struct mount *mnt, int count)  in do_refcount_check()  argument
364 	return mnt_get_count(mnt) > count;  in do_refcount_check()
377 int propagate_mount_busy(struct mount *mnt, int refcnt)  in propagate_mount_busy()  argument
380 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_busy()
382 	if (mnt == parent)  in propagate_mount_busy()
383 		return do_refcount_check(mnt, refcnt);  in propagate_mount_busy()
390 	if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))  in propagate_mount_busy()
396 		child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_busy()
420 void propagate_mount_unlock(struct mount *mnt)  in propagate_mount_unlock()  argument
422 	struct mount *parent = mnt->mnt_parent;  in propagate_mount_unlock()
425 	BUG_ON(parent == mnt);  in propagate_mount_unlock()
429 		child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint);  in propagate_mount_unlock()
431 			child->mnt.mnt_flags &= ~MNT_LOCKED;  in propagate_mount_unlock()
435 static void umount_one(struct mount *mnt, struct list_head *to_umount)  in umount_one()  argument
437 	CLEAR_MNT_MARK(mnt);  in umount_one()
438 	mnt->mnt.mnt_flags |= MNT_UMOUNT;  in umount_one()
439 	list_del_init(&mnt->mnt_child);  in umount_one()
440 	list_del_init(&mnt->mnt_umounting);  in umount_one()
441 	list_move_tail(&mnt->mnt_list, to_umount);  in umount_one()
448 static bool __propagate_umount(struct mount *mnt,  in __propagate_umount()  argument
459 	if (mnt->mnt.mnt_flags & (MNT_UMOUNT | MNT_MARKED))  in __propagate_umount()
465 	list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) {  in __propagate_umount()
466 		if (child->mnt_mountpoint == mnt->mnt.mnt_root)  in __propagate_umount()
475 	SET_MNT_MARK(mnt);  in __propagate_umount()
479 	if (!IS_MNT_LOCKED(mnt)) {  in __propagate_umount()
480 		umount_one(mnt, to_umount);  in __propagate_umount()
483 		list_move_tail(&mnt->mnt_umounting, to_restore);  in __propagate_umount()
492 	struct mount *mnt, *child, *tmp;  in umount_list()  local
493 	list_for_each_entry(mnt, to_umount, mnt_list) {  in umount_list()
494 		list_for_each_entry_safe(child, tmp, &mnt->mnt_mounts, mnt_child) {  in umount_list()
496 			if (child->mnt_mountpoint == mnt->mnt.mnt_root)  in umount_list()
508 		struct mount *mnt, *parent;  in restore_mounts()  local
511 		mnt = list_first_entry(to_restore, struct mount, mnt_umounting);  in restore_mounts()
512 		CLEAR_MNT_MARK(mnt);  in restore_mounts()
513 		list_del_init(&mnt->mnt_umounting);  in restore_mounts()
516 		mp = mnt->mnt_mp;  in restore_mounts()
517 		parent = mnt->mnt_parent;  in restore_mounts()
518 		while (parent->mnt.mnt_flags & MNT_UMOUNT) {  in restore_mounts()
522 		if (parent != mnt->mnt_parent)  in restore_mounts()
523 			mnt_change_mountpoint(parent, mp, mnt);  in restore_mounts()
530 		struct mount *mnt =  in cleanup_umount_visitations()  local
532 		list_del_init(&mnt->mnt_umounting);  in cleanup_umount_visitations()
545 	struct mount *mnt;  in propagate_umount()  local
551 	list_for_each_entry_reverse(mnt, list, mnt_list) {  in propagate_umount()
552 		struct mount *parent = mnt->mnt_parent;  in propagate_umount()
561 		if (!list_empty(&mnt->mnt_umounting))  in propagate_umount()
564 		list_add_tail(&mnt->mnt_umounting, &visited);  in propagate_umount()
567 			struct mount *child = __lookup_mnt(&m->mnt,  in propagate_umount()
568 							   mnt->mnt_mountpoint);  in propagate_umount()
582 			} else if (child->mnt.mnt_flags & MNT_UMOUNT) {  in propagate_umount()
612 void propagate_remount(struct mount *mnt)  in propagate_remount()  argument
614 	struct mount *parent = mnt->mnt_parent;  in propagate_remount()
615 	struct mount *p = mnt, *m;  in propagate_remount()
616 	struct super_block *sb = mnt->mnt.mnt_sb;  in propagate_remount()
622 		m = __lookup_mnt(&p->mnt, mnt->mnt_mountpoint);  in propagate_remount()
624 			sb->s_op->copy_mnt_data(m->mnt.data, mnt->mnt.data);  in propagate_remount()