seqid->task = task;
int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task){	struct rpc_sequence *sequence = seqid->sequence->sequence;	int status = 0;	spin_lock(&sequence->lock);	if (sequence->list.next != &seqid->list) {		seqid->task = task;		rpc_sleep_on(&sequence->wait, task, NULL, NULL);		status = -EAGAIN;	}	spin_unlock(&sequence->lock);	return status;}