81 static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry)  in m_hash()  argument
84 	tmp += ((unsigned long)dentry / L1_CACHE_BYTES);  in m_hash()
89 static inline struct hlist_head *mp_hash(struct dentry *dentry)  in mp_hash()  argument
91 	unsigned long tmp = ((unsigned long)dentry / L1_CACHE_BYTES);  in mp_hash()
629 struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)  in __lookup_mnt()  argument
631 	struct hlist_head *head = m_hash(mnt, dentry);  in __lookup_mnt()
635 		if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry)  in __lookup_mnt()
644 struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry)  in __lookup_mnt_last()  argument
647 	p = __lookup_mnt(mnt, dentry);  in __lookup_mnt_last()
653 		if (&p->mnt_parent->mnt != mnt || p->mnt_mountpoint != dentry)  in __lookup_mnt_last()
687 		child_mnt = __lookup_mnt(path->mnt, path->dentry);  in lookup_mnt()
709 bool __is_local_mountpoint(struct dentry *dentry)  in __is_local_mountpoint()  argument
715 	if (!d_mountpoint(dentry))  in __is_local_mountpoint()
720 		is_covered = (mnt->mnt_mountpoint == dentry);  in __is_local_mountpoint()
729 static struct mountpoint *lookup_mountpoint(struct dentry *dentry)  in lookup_mountpoint()  argument
731 	struct hlist_head *chain = mp_hash(dentry);  in lookup_mountpoint()
735 		if (mp->m_dentry == dentry) {  in lookup_mountpoint()
737 			if (d_unlinked(dentry))  in lookup_mountpoint()
746 static struct mountpoint *new_mountpoint(struct dentry *dentry)  in new_mountpoint()  argument
748 	struct hlist_head *chain = mp_hash(dentry);  in new_mountpoint()
756 	ret = d_set_mounted(dentry);  in new_mountpoint()
762 	mp->m_dentry = dentry;  in new_mountpoint()
772 		struct dentry *dentry = mp->m_dentry;  in put_mountpoint()  local
774 		spin_lock(&dentry->d_lock);  in put_mountpoint()
775 		dentry->d_flags &= ~DCACHE_MOUNTED;  in put_mountpoint()
776 		spin_unlock(&dentry->d_lock);  in put_mountpoint()
828 	old_path->dentry = mnt->mnt_mountpoint;  in detach_mnt()
936 	struct dentry *root;  in vfs_kern_mount()
966 static struct mount *clone_mnt(struct mount *old, struct dentry *root,  in clone_mnt()
1159 	p = clone_mnt(real_mount(path->mnt), path->dentry, CL_PRIVATE);  in mnt_clone_internal()
1177 int generic_show_options(struct seq_file *m, struct dentry *root)  in generic_show_options()
1554 void __detach_mounts(struct dentry *dentry)  in __detach_mounts()  argument
1560 	mp = lookup_mountpoint(dentry);  in __detach_mounts()
1616 	if (path.dentry != path.mnt->mnt_root)  in SYSCALL_DEFINE2()
1629 	dput(path.dentry);  in SYSCALL_DEFINE2()
1647 static bool is_mnt_ns_file(struct dentry *dentry)  in is_mnt_ns_file()  argument
1650 	return dentry->d_op == &ns_dentry_operations &&  in is_mnt_ns_file()
1651 	       dentry->d_fsdata == &mntns_operations;  in is_mnt_ns_file()
1659 static bool mnt_ns_loop(struct dentry *dentry)  in mnt_ns_loop()  argument
1665 	if (!is_mnt_ns_file(dentry))  in mnt_ns_loop()
1668 	mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode));  in mnt_ns_loop()
1672 struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,  in copy_tree()  argument
1680 	if (!(flag & CL_COPY_MNT_NS_FILE) && is_mnt_ns_file(dentry))  in copy_tree()
1683 	res = q = clone_mnt(mnt, dentry, flag);  in copy_tree()
1692 		if (!is_subdir(r->mnt_mountpoint, dentry))  in copy_tree()
1748 		tree = copy_tree(real_mount(path->mnt), path->dentry,  in collect_mounts()
1783 	new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);  in clone_private_mount()
1954 	struct dentry *dentry = path->dentry;  in lock_mount()  local
1956 	mutex_lock(&dentry->d_inode->i_mutex);  in lock_mount()
1957 	if (unlikely(cant_mount(dentry))) {  in lock_mount()
1958 		mutex_unlock(&dentry->d_inode->i_mutex);  in lock_mount()
1964 		struct mountpoint *mp = lookup_mountpoint(dentry);  in lock_mount()
1966 			mp = new_mountpoint(dentry);  in lock_mount()
1969 			mutex_unlock(&dentry->d_inode->i_mutex);  in lock_mount()
1975 	mutex_unlock(&path->dentry->d_inode->i_mutex);  in lock_mount()
1978 	dentry = path->dentry = dget(mnt->mnt_root);  in lock_mount()
1984 	struct dentry *dentry = where->m_dentry;  in unlock_mount()  local
1987 	mutex_unlock(&dentry->d_inode->i_mutex);  in unlock_mount()
2030 	if (path->dentry != path->mnt->mnt_root)  in do_change_type()
2054 static bool has_locked_children(struct mount *mnt, struct dentry *dentry)  in has_locked_children()  argument
2058 		if (!is_subdir(child->mnt_mountpoint, dentry))  in has_locked_children()
2084 	if (mnt_ns_loop(old_path.dentry))  in do_loopback()
2102 	if (!check_mnt(old) && old_path.dentry->d_op != &ns_dentry_operations)  in do_loopback()
2105 	if (!recurse && has_locked_children(old, old_path.dentry))  in do_loopback()
2109 		mnt = copy_tree(old, old_path.dentry, CL_COPY_MNT_NS_FILE);  in do_loopback()
2111 		mnt = clone_mnt(old, old_path.dentry, 0);  in do_loopback()
2165 	if (path->dentry != path->mnt->mnt_root)  in do_remount()
2262 	if (old_path.dentry != old_path.mnt->mnt_root)  in do_move_mount()
2268 	if (d_is_dir(path->dentry) !=  in do_move_mount()
2269 	      d_is_dir(old_path.dentry))  in do_move_mount()
2355 	    path->mnt->mnt_root == path->dentry)  in do_add_mount()
2434 	    m->mnt_root == path->dentry) {  in finish_automount()
2863 struct dentry *mount_subtree(struct vfsmount *mnt, const char *name)  in mount_subtree()
2889 	return path.dentry;  in mount_subtree()
2932 bool is_path_reachable(struct mount *mnt, struct dentry *dentry,  in is_path_reachable()  argument
2936 		dentry = mnt->mnt_mountpoint;  in is_path_reachable()
2939 	return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);  in is_path_reachable()
2946 	res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);  in path_is_under()
3019 	if (d_unlinked(new.dentry))  in SYSCALL_DEFINE2()
3025 	if (root.mnt->mnt_root != root.dentry)  in SYSCALL_DEFINE2()
3030 	if (new.mnt->mnt_root != new.dentry)  in SYSCALL_DEFINE2()
3035 	if (!is_path_reachable(old_mnt, old.dentry, &new))  in SYSCALL_DEFINE2()
3038 	if (!is_path_reachable(new_mnt, new.dentry, &root))  in SYSCALL_DEFINE2()
3098 	root.dentry = mnt->mnt_root;  in init_mount_tree()
3193 	ns_root.dentry = ns_root.mnt->mnt_root;  in current_chrooted()
3195 	while (d_mountpoint(ns_root.dentry) && follow_down_one(&ns_root))  in current_chrooted()
3327 	root.dentry = mnt_ns->root->mnt.mnt_root;  in mntns_install()
3329 	while(d_mountpoint(root.dentry) && follow_down_one(&root))  in mntns_install()