rem: static int rootfs_insert_in_dir(struct rootfs_vnode *dir, struct rootfs_vnode *v)
add: rootfs_insert_in_dir(struct rootfs_vnode *dir, struct rootfs_vnode *v)
context: static int rootfs_insert_in_dir(struct rootfs_vnode *dir, struct rootfs_vnode *v){	v->dir_next = dir->stream.dir.dir_head;	dir->stream.dir.dir_head = v;	return 0;}