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()
618 struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)  in __lookup_mnt()  argument
620 	struct hlist_head *head = m_hash(mnt, dentry);  in __lookup_mnt()
624 		if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry)  in __lookup_mnt()
633 struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry)  in __lookup_mnt_last()  argument
636 	p = __lookup_mnt(mnt, dentry);  in __lookup_mnt_last()
642 		if (&p->mnt_parent->mnt != mnt || p->mnt_mountpoint != dentry)  in __lookup_mnt_last()
676 		child_mnt = __lookup_mnt(path->mnt, path->dentry);  in lookup_mnt()
698 bool __is_local_mountpoint(struct dentry *dentry)  in __is_local_mountpoint()  argument
704 	if (!d_mountpoint(dentry))  in __is_local_mountpoint()
709 		is_covered = (mnt->mnt_mountpoint == dentry);  in __is_local_mountpoint()
718 static struct mountpoint *lookup_mountpoint(struct dentry *dentry)  in lookup_mountpoint()  argument
720 	struct hlist_head *chain = mp_hash(dentry);  in lookup_mountpoint()
724 		if (mp->m_dentry == dentry) {  in lookup_mountpoint()
726 			if (d_unlinked(dentry))  in lookup_mountpoint()
735 static struct mountpoint *new_mountpoint(struct dentry *dentry)  in new_mountpoint()  argument
737 	struct hlist_head *chain = mp_hash(dentry);  in new_mountpoint()
745 	ret = d_set_mounted(dentry);  in new_mountpoint()
751 	mp->m_dentry = dentry;  in new_mountpoint()
761 		struct dentry *dentry = mp->m_dentry;  in put_mountpoint()  local
763 		spin_lock(&dentry->d_lock);  in put_mountpoint()
764 		dentry->d_flags &= ~DCACHE_MOUNTED;  in put_mountpoint()
765 		spin_unlock(&dentry->d_lock);  in put_mountpoint()
817 	old_path->dentry = mnt->mnt_mountpoint;  in detach_mnt()
925 	struct dentry *root;  in vfs_kern_mount()
955 static struct mount *clone_mnt(struct mount *old, struct dentry *root,  in clone_mnt()
1148 	p = clone_mnt(real_mount(path->mnt), path->dentry, CL_PRIVATE);  in mnt_clone_internal()
1166 int generic_show_options(struct seq_file *m, struct dentry *root)  in generic_show_options()
1543 void __detach_mounts(struct dentry *dentry)  in __detach_mounts()  argument
1549 	mp = lookup_mountpoint(dentry);  in __detach_mounts()
1605 	if (path.dentry != path.mnt->mnt_root)  in SYSCALL_DEFINE2()
1618 	dput(path.dentry);  in SYSCALL_DEFINE2()
1636 static bool is_mnt_ns_file(struct dentry *dentry)  in is_mnt_ns_file()  argument
1639 	return dentry->d_op == &ns_dentry_operations &&  in is_mnt_ns_file()
1640 	       dentry->d_fsdata == &mntns_operations;  in is_mnt_ns_file()
1648 static bool mnt_ns_loop(struct dentry *dentry)  in mnt_ns_loop()  argument
1654 	if (!is_mnt_ns_file(dentry))  in mnt_ns_loop()
1657 	mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode));  in mnt_ns_loop()
1661 struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,  in copy_tree()  argument
1669 	if (!(flag & CL_COPY_MNT_NS_FILE) && is_mnt_ns_file(dentry))  in copy_tree()
1672 	res = q = clone_mnt(mnt, dentry, flag);  in copy_tree()
1681 		if (!is_subdir(r->mnt_mountpoint, dentry))  in copy_tree()
1737 		tree = copy_tree(real_mount(path->mnt), path->dentry,  in collect_mounts()
1772 	new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);  in clone_private_mount()
1943 	struct dentry *dentry = path->dentry;  in lock_mount()  local
1945 	mutex_lock(&dentry->d_inode->i_mutex);  in lock_mount()
1946 	if (unlikely(cant_mount(dentry))) {  in lock_mount()
1947 		mutex_unlock(&dentry->d_inode->i_mutex);  in lock_mount()
1953 		struct mountpoint *mp = lookup_mountpoint(dentry);  in lock_mount()
1955 			mp = new_mountpoint(dentry);  in lock_mount()
1958 			mutex_unlock(&dentry->d_inode->i_mutex);  in lock_mount()
1964 	mutex_unlock(&path->dentry->d_inode->i_mutex);  in lock_mount()
1967 	dentry = path->dentry = dget(mnt->mnt_root);  in lock_mount()
1973 	struct dentry *dentry = where->m_dentry;  in unlock_mount()  local
1976 	mutex_unlock(&dentry->d_inode->i_mutex);  in unlock_mount()
2019 	if (path->dentry != path->mnt->mnt_root)  in do_change_type()
2043 static bool has_locked_children(struct mount *mnt, struct dentry *dentry)  in has_locked_children()  argument
2047 		if (!is_subdir(child->mnt_mountpoint, dentry))  in has_locked_children()
2073 	if (mnt_ns_loop(old_path.dentry))  in do_loopback()
2091 	if (!check_mnt(old) && old_path.dentry->d_op != &ns_dentry_operations)  in do_loopback()
2094 	if (!recurse && has_locked_children(old, old_path.dentry))  in do_loopback()
2098 		mnt = copy_tree(old, old_path.dentry, CL_COPY_MNT_NS_FILE);  in do_loopback()
2100 		mnt = clone_mnt(old, old_path.dentry, 0);  in do_loopback()
2154 	if (path->dentry != path->mnt->mnt_root)  in do_remount()
2251 	if (old_path.dentry != old_path.mnt->mnt_root)  in do_move_mount()
2257 	if (d_is_dir(path->dentry) !=  in do_move_mount()
2258 	      d_is_dir(old_path.dentry))  in do_move_mount()
2344 	    path->mnt->mnt_root == path->dentry)  in do_add_mount()
2425 	    m->mnt_root == path->dentry) {  in finish_automount()
2854 struct dentry *mount_subtree(struct vfsmount *mnt, const char *name)  in mount_subtree()
2880 	return path.dentry;  in mount_subtree()
2923 bool is_path_reachable(struct mount *mnt, struct dentry *dentry,  in is_path_reachable()  argument
2927 		dentry = mnt->mnt_mountpoint;  in is_path_reachable()
2930 	return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);  in is_path_reachable()
2937 	res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);  in path_is_under()
3010 	if (d_unlinked(new.dentry))  in SYSCALL_DEFINE2()
3016 	if (root.mnt->mnt_root != root.dentry)  in SYSCALL_DEFINE2()
3021 	if (new.mnt->mnt_root != new.dentry)  in SYSCALL_DEFINE2()
3026 	if (!is_path_reachable(old_mnt, old.dentry, &new))  in SYSCALL_DEFINE2()
3029 	if (!is_path_reachable(new_mnt, new.dentry, &root))  in SYSCALL_DEFINE2()
3089 	root.dentry = mnt->mnt_root;  in init_mount_tree()
3184 	ns_root.dentry = ns_root.mnt->mnt_root;  in current_chrooted()
3186 	while (d_mountpoint(ns_root.dentry) && follow_down_one(&ns_root))  in current_chrooted()
3301 	root.dentry = mnt_ns->root->mnt.mnt_root;  in mntns_install()
3303 	while(d_mountpoint(root.dentry) && follow_down_one(&root))  in mntns_install()