668 static inline void lock_ns_list(struct mnt_namespace *ns)  in lock_ns_list()  argument
670 	spin_lock(&ns->ns_lock);  in lock_ns_list()
673 static inline void unlock_ns_list(struct mnt_namespace *ns)  in unlock_ns_list()  argument
675 	spin_unlock(&ns->ns_lock);  in unlock_ns_list()
700 	struct mnt_namespace *ns = current->nsproxy->mnt_ns;  in __is_local_mountpoint()  local
705 	lock_ns_list(ns);  in __is_local_mountpoint()
706 	list_for_each_entry(mnt, &ns->list, mnt_list) {  in __is_local_mountpoint()
713 	unlock_ns_list(ns);  in __is_local_mountpoint()
815 static void touch_mnt_namespace(struct mnt_namespace *ns)  in touch_mnt_namespace()  argument
817 	if (ns) {  in touch_mnt_namespace()
818 		ns->event = ++event;  in touch_mnt_namespace()
819 		wake_up_interruptible(&ns->poll);  in touch_mnt_namespace()
826 static void __touch_mnt_namespace(struct mnt_namespace *ns)  in __touch_mnt_namespace()  argument
828 	if (ns && ns->event != event) {  in __touch_mnt_namespace()
829 		ns->event = event;  in __touch_mnt_namespace()
830 		wake_up_interruptible(&ns->poll);  in __touch_mnt_namespace()
1293 static struct mount *mnt_list_next(struct mnt_namespace *ns,  in mnt_list_next()  argument
1298 	lock_ns_list(ns);  in mnt_list_next()
1299 	list_for_each_continue(p, &ns->list) {  in mnt_list_next()
1306 	unlock_ns_list(ns);  in mnt_list_next()
1319 		prev = &p->ns->list;  in m_start()
1328 	return mnt_list_next(p->ns, prev);  in m_start()
1337 	return mnt_list_next(p->ns, &mnt->mnt_list);  in m_next()
1345 	lock_ns_list(p->ns);  in m_stop()
1350 	unlock_ns_list(p->ns);  in m_stop()
1368 void mnt_cursor_del(struct mnt_namespace *ns, struct mount *cursor)  in mnt_cursor_del()  argument
1371 	lock_ns_list(ns);  in mnt_cursor_del()
1373 	unlock_ns_list(ns);  in mnt_cursor_del()
1530 		struct mnt_namespace *ns;  in umount_tree()  local
1535 		ns = p->mnt_ns;  in umount_tree()
1536 		if (ns) {  in umount_tree()
1537 			ns->mounts--;  in umount_tree()
1538 			__touch_mnt_namespace(ns);  in umount_tree()
1809 static struct mnt_namespace *to_mnt_ns(struct ns_common *ns)  in to_mnt_ns()  argument
1811 	return container_of(ns, struct mnt_namespace, ns);  in to_mnt_ns()
1816 	return &mnt->ns;  in from_mnt_ns()
1919 	struct mnt_namespace *ns;  in dissolve_on_fput()  local
1922 	ns = real_mount(mnt)->mnt_ns;  in dissolve_on_fput()
1923 	if (ns) {  in dissolve_on_fput()
1924 		if (is_anon_ns(ns))  in dissolve_on_fput()
1927 			ns = NULL;  in dissolve_on_fput()
1931 	if (ns)  in dissolve_on_fput()
1932 		free_mnt_ns(ns);  in dissolve_on_fput()
2069 int count_mounts(struct mnt_namespace *ns, struct mount *mnt)  in count_mounts()  argument
2078 	old = ns->mounts;  in count_mounts()
2079 	pending = ns->pending_mounts;  in count_mounts()
2087 	ns->pending_mounts = pending + mounts;  in count_mounts()
2161 	struct mnt_namespace *ns = dest_mnt->mnt_ns;  in attach_recursive_mnt()  local
2176 		err = count_mounts(ns, source_mnt);  in attach_recursive_mnt()
2234 	ns->pending_mounts = 0;  in attach_recursive_mnt()
2424 	struct mnt_namespace *ns = alloc_mnt_ns(user_ns, true);  in open_detached_copy()  local
2428 	if (IS_ERR(ns))  in open_detached_copy()
2429 		return ERR_CAST(ns);  in open_detached_copy()
2435 		free_mnt_ns(ns);  in open_detached_copy()
2441 		p->mnt_ns = ns;  in open_detached_copy()
2442 		ns->mounts++;  in open_detached_copy()
2444 	ns->root = mnt;  in open_detached_copy()
2445 	list_add_tail(&ns->list, &mnt->mnt_list);  in open_detached_copy()
2783 	struct mnt_namespace *ns;  in do_move_mount()  local
2800 	ns = old->mnt_ns;  in do_move_mount()
2812 	if (!(attached ? check_mnt(old) : is_anon_ns(ns)))  in do_move_mount()
2858 			free_mnt_ns(ns);  in do_move_mount()
3353 static struct ucounts *inc_mnt_namespaces(struct user_namespace *ns)  in inc_mnt_namespaces()  argument
3355 	return inc_ucount(ns, current_euid(), UCOUNT_MNT_NAMESPACES);  in inc_mnt_namespaces()
3363 static void free_mnt_ns(struct mnt_namespace *ns)  in free_mnt_ns()  argument
3365 	if (!is_anon_ns(ns))  in free_mnt_ns()
3366 		ns_free_inum(&ns->ns);  in free_mnt_ns()
3367 	dec_mnt_namespaces(ns->ucounts);  in free_mnt_ns()
3368 	put_user_ns(ns->user_ns);  in free_mnt_ns()
3369 	kfree(ns);  in free_mnt_ns()
3397 		ret = ns_alloc_inum(&new_ns->ns);  in alloc_mnt_ns()
3404 	new_ns->ns.ops = &mntns_operations;  in alloc_mnt_ns()
3407 	refcount_set(&new_ns->ns.count, 1);  in alloc_mnt_ns()
3417 struct mnt_namespace *copy_mnt_ns(unsigned long flags, struct mnt_namespace *ns,  in copy_mnt_ns()  argument
3427 	BUG_ON(!ns);  in copy_mnt_ns()
3430 		get_mnt_ns(ns);  in copy_mnt_ns()
3431 		return ns;  in copy_mnt_ns()
3434 	old = ns->root;  in copy_mnt_ns()
3443 	if (user_ns != ns->user_ns)  in copy_mnt_ns()
3451 	if (user_ns != ns->user_ns) {  in copy_mnt_ns()
3499 	struct mnt_namespace *ns;  in mount_subtree()  local
3504 	ns = alloc_mnt_ns(&init_user_ns, true);  in mount_subtree()
3505 	if (IS_ERR(ns)) {  in mount_subtree()
3507 		return ERR_CAST(ns);  in mount_subtree()
3509 	mnt->mnt_ns = ns;  in mount_subtree()
3510 	ns->root = mnt;  in mount_subtree()
3511 	ns->mounts++;  in mount_subtree()
3512 	list_add(&mnt->mnt_list, &ns->list);  in mount_subtree()
3517 	put_mnt_ns(ns);  in mount_subtree()
3604 	struct mnt_namespace *ns;  in SYSCALL_DEFINE3()  local
3684 	ns = alloc_mnt_ns(current->nsproxy->mnt_ns->user_ns, true);  in SYSCALL_DEFINE3()
3685 	if (IS_ERR(ns)) {  in SYSCALL_DEFINE3()
3686 		ret = PTR_ERR(ns);  in SYSCALL_DEFINE3()
3690 	mnt->mnt_ns = ns;  in SYSCALL_DEFINE3()
3691 	ns->root = mnt;  in SYSCALL_DEFINE3()
3692 	ns->mounts = 1;  in SYSCALL_DEFINE3()
3693 	list_add(&mnt->mnt_list, &ns->list);  in SYSCALL_DEFINE3()
4147 	struct ns_common *ns;  in build_mount_idmapped()  local
4174 	ns = get_proc_ns(file_inode(file));  in build_mount_idmapped()
4175 	if (ns->ops->type != CLONE_NEWUSER) {  in build_mount_idmapped()
4188 	mnt_userns = container_of(ns, struct user_namespace, ns);  in build_mount_idmapped()
4332 	struct mnt_namespace *ns;  in init_mount_tree()  local
4339 	ns = alloc_mnt_ns(&init_user_ns, false);  in init_mount_tree()
4340 	if (IS_ERR(ns))  in init_mount_tree()
4343 	m->mnt_ns = ns;  in init_mount_tree()
4344 	ns->root = m;  in init_mount_tree()
4345 	ns->mounts = 1;  in init_mount_tree()
4346 	list_add(&m->mnt_list, &ns->list);  in init_mount_tree()
4347 	init_task.nsproxy->mnt_ns = ns;  in init_mount_tree()
4348 	get_mnt_ns(ns);  in init_mount_tree()
4393 void put_mnt_ns(struct mnt_namespace *ns)  in put_mnt_ns()  argument
4395 	if (!refcount_dec_and_test(&ns->ns.count))  in put_mnt_ns()
4397 	drop_collected_mounts(&ns->root->mnt);  in put_mnt_ns()
4398 	free_mnt_ns(ns);  in put_mnt_ns()
4469 static bool mnt_already_visible(struct mnt_namespace *ns,  in mnt_already_visible()  argument
4478 	lock_ns_list(ns);  in mnt_already_visible()
4479 	list_for_each_entry(mnt, &ns->list, mnt_list) {  in mnt_already_visible()
4533 	unlock_ns_list(ns);  in mnt_already_visible()
4541 	struct mnt_namespace *ns = current->nsproxy->mnt_ns;  in mount_too_revealing()  local
4544 	if (ns->user_ns == &init_user_ns)  in mount_too_revealing()
4558 	return !mnt_already_visible(ns, sb, new_mnt_flags);  in mount_too_revealing()
4576 	struct ns_common *ns = NULL;  in mntns_get()  local
4582 		ns = &nsproxy->mnt_ns->ns;  in mntns_get()
4583 		get_mnt_ns(to_mnt_ns(ns));  in mntns_get()
4587 	return ns;  in mntns_get()
4590 static void mntns_put(struct ns_common *ns)  in mntns_put()  argument
4592 	put_mnt_ns(to_mnt_ns(ns));  in mntns_put()
4595 static int mntns_install(struct nsset *nsset, struct ns_common *ns)  in mntns_install()  argument
4599 	struct mnt_namespace *mnt_ns = to_mnt_ns(ns), *old_mnt_ns;  in mntns_install()
4639 static struct user_namespace *mntns_owner(struct ns_common *ns)  in mntns_owner()  argument
4641 	return to_mnt_ns(ns)->user_ns;  in mntns_owner()