482 	struct kernfs_root *root = kernfs_root(kn);  in kernfs_drain()  local
484 	lockdep_assert_held_write(&root->kernfs_rwsem);  in kernfs_drain()
497 	up_write(&root->kernfs_rwsem);  in kernfs_drain()
505 	wait_event(root->deactivate_waitq,  in kernfs_drain()
516 	down_write(&root->kernfs_rwsem);  in kernfs_drain()
555 	struct kernfs_root *root;  in kernfs_put()  local
559 	root = kernfs_root(kn);  in kernfs_put()
575 	idr_remove(&root->ino_idr, (u32)kernfs_ino(kn));  in kernfs_put()
586 		idr_destroy(&root->ino_idr);  in kernfs_put()
587 		kfree_rcu(root, rcu);  in kernfs_put()
610 static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,  in __kernfs_new_node()  argument
630 	ret = idr_alloc_cyclic(&root->ino_idr, kn, 1, 0, GFP_ATOMIC);  in __kernfs_new_node()
631 	if (ret >= 0 && ret < root->last_id_lowbits)  in __kernfs_new_node()
632 		root->id_highbits++;  in __kernfs_new_node()
633 	id_highbits = root->id_highbits;  in __kernfs_new_node()
634 	root->last_id_lowbits = ret;  in __kernfs_new_node()
672 	idr_remove(&root->ino_idr, (u32)kernfs_ino(kn));  in __kernfs_new_node()
720 struct kernfs_node *kernfs_find_and_get_node_by_id(struct kernfs_root *root,  in kernfs_find_and_get_node_by_id()  argument
729 	kn = idr_find(&root->ino_idr, (u32)ino);  in kernfs_find_and_get_node_by_id()
773 	struct kernfs_root *root = kernfs_root(parent);  in kernfs_add_one()  local
778 	down_write(&root->kernfs_rwsem);  in kernfs_add_one()
800 	down_write(&root->kernfs_iattr_rwsem);  in kernfs_add_one()
808 	up_write(&root->kernfs_iattr_rwsem);  in kernfs_add_one()
809 	up_write(&root->kernfs_rwsem);  in kernfs_add_one()
823 	up_write(&root->kernfs_rwsem);  in kernfs_add_one()
916 	struct kernfs_root *root = kernfs_root(parent);  in kernfs_find_and_get_ns()  local
918 	down_read(&root->kernfs_rwsem);  in kernfs_find_and_get_ns()
921 	up_read(&root->kernfs_rwsem);  in kernfs_find_and_get_ns()
942 	struct kernfs_root *root = kernfs_root(parent);  in kernfs_walk_and_get_ns()  local
944 	down_read(&root->kernfs_rwsem);  in kernfs_walk_and_get_ns()
947 	up_read(&root->kernfs_rwsem);  in kernfs_walk_and_get_ns()
964 	struct kernfs_root *root;  in kernfs_create_root()  local
967 	root = kzalloc(sizeof(*root), GFP_KERNEL);  in kernfs_create_root()
968 	if (!root)  in kernfs_create_root()
971 	idr_init(&root->ino_idr);  in kernfs_create_root()
972 	init_rwsem(&root->kernfs_rwsem);  in kernfs_create_root()
973 	init_rwsem(&root->kernfs_iattr_rwsem);  in kernfs_create_root()
974 	init_rwsem(&root->kernfs_supers_rwsem);  in kernfs_create_root()
975 	INIT_LIST_HEAD(&root->supers);  in kernfs_create_root()
984 		root->id_highbits = 0;  in kernfs_create_root()
986 		root->id_highbits = 1;  in kernfs_create_root()
988 	kn = __kernfs_new_node(root, NULL, "", S_IFDIR | S_IRUGO | S_IXUGO,  in kernfs_create_root()
992 		idr_destroy(&root->ino_idr);  in kernfs_create_root()
993 		kfree(root);  in kernfs_create_root()
998 	kn->dir.root = root;  in kernfs_create_root()
1000 	root->syscall_ops = scops;  in kernfs_create_root()
1001 	root->flags = flags;  in kernfs_create_root()
1002 	root->kn = kn;  in kernfs_create_root()
1003 	init_waitqueue_head(&root->deactivate_waitq);  in kernfs_create_root()
1005 	if (!(root->flags & KERNFS_ROOT_CREATE_DEACTIVATED))  in kernfs_create_root()
1008 	return root;  in kernfs_create_root()
1018 void kernfs_destroy_root(struct kernfs_root *root)  in kernfs_destroy_root()  argument
1024 	kernfs_get(root->kn);  in kernfs_destroy_root()
1025 	kernfs_remove(root->kn);  in kernfs_destroy_root()
1026 	kernfs_put(root->kn); /* will also free @root */  in kernfs_destroy_root()
1035 struct kernfs_node *kernfs_root_to_node(struct kernfs_root *root)  in kernfs_root_to_node()  argument
1037 	return root->kn;  in kernfs_root_to_node()
1066 	kn->dir.root = parent->dir.root;  in kernfs_create_dir_ns()
1099 	kn->dir.root = parent->dir.root;  in kernfs_create_empty_dir()
1115 	struct kernfs_root *root;  in kernfs_dop_revalidate()  local
1140 		root = kernfs_root_from_sb(dentry->d_sb);  in kernfs_dop_revalidate()
1141 		down_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1145 				up_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1149 		up_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1158 	root = kernfs_root(kn);  in kernfs_dop_revalidate()
1159 	down_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1178 	up_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1181 	up_read(&root->kernfs_rwsem);  in kernfs_dop_revalidate()
1195 	struct kernfs_root *root;  in kernfs_iop_lookup()  local
1199 	root = kernfs_root(parent);  in kernfs_iop_lookup()
1200 	down_read(&root->kernfs_rwsem);  in kernfs_iop_lookup()
1211 			up_read(&root->kernfs_rwsem);  in kernfs_iop_lookup()
1226 	up_read(&root->kernfs_rwsem);  in kernfs_iop_lookup()
1347 						       struct kernfs_node *root)  in kernfs_next_descendant_post()  argument
1351 	lockdep_assert_held_write(&kernfs_root(root)->kernfs_rwsem);  in kernfs_next_descendant_post()
1355 		return kernfs_leftmost_descendant(root);  in kernfs_next_descendant_post()
1358 	if (pos == root)  in kernfs_next_descendant_post()
1401 	struct kernfs_root *root = kernfs_root(kn);  in kernfs_activate()  local
1403 	down_write(&root->kernfs_rwsem);  in kernfs_activate()
1409 	up_write(&root->kernfs_rwsem);  in kernfs_activate()
1426 	struct kernfs_root *root = kernfs_root(kn);  in kernfs_show()  local
1431 	down_write(&root->kernfs_rwsem);  in kernfs_show()
1444 	up_write(&root->kernfs_rwsem);  in kernfs_show()
1520 	struct kernfs_root *root;  in kernfs_remove()  local
1525 	root = kernfs_root(kn);  in kernfs_remove()
1527 	down_write(&root->kernfs_rwsem);  in kernfs_remove()
1529 	up_write(&root->kernfs_rwsem);  in kernfs_remove()
1617 	struct kernfs_root *root = kernfs_root(kn);  in kernfs_remove_self()  local
1619 	down_write(&root->kernfs_rwsem);  in kernfs_remove_self()
1647 			up_write(&root->kernfs_rwsem);  in kernfs_remove_self()
1649 			down_write(&root->kernfs_rwsem);  in kernfs_remove_self()
1662 	up_write(&root->kernfs_rwsem);  in kernfs_remove_self()
1680 	struct kernfs_root *root;  in kernfs_remove_by_name_ns()  local
1688 	root = kernfs_root(parent);  in kernfs_remove_by_name_ns()
1689 	down_write(&root->kernfs_rwsem);  in kernfs_remove_by_name_ns()
1698 	up_write(&root->kernfs_rwsem);  in kernfs_remove_by_name_ns()
1719 	struct kernfs_root *root;  in kernfs_rename_ns()  local
1727 	root = kernfs_root(kn);  in kernfs_rename_ns()
1728 	down_write(&root->kernfs_rwsem);  in kernfs_rename_ns()
1782 	up_write(&root->kernfs_rwsem);  in kernfs_rename_ns()
1847 	struct kernfs_root *root;  in kernfs_fop_readdir()  local
1853 	root = kernfs_root(parent);  in kernfs_fop_readdir()
1854 	down_read(&root->kernfs_rwsem);  in kernfs_fop_readdir()
1871 		up_read(&root->kernfs_rwsem);  in kernfs_fop_readdir()
1874 		down_read(&root->kernfs_rwsem);  in kernfs_fop_readdir()
1876 	up_read(&root->kernfs_rwsem);  in kernfs_fop_readdir()