NFSv4: Convert open() into an asynchronous RPC call

 OPEN is a stateful operation, so we must ensure that it always
 completes. In order to allow users to interrupt the operation,
 we need to make the RPC call asynchronous, and then wait on
 completion (or cancel).
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4xdr.c

@@ -1499,9 +1499,6 @@ static int nfs4_xdr_enc_open(struct rpc_rqst *req, uint32_t *p, struct nfs_opena
 	};
 	int status;
 
-	status = nfs_wait_on_sequence(args->seqid, req->rq_task);
-	if (status != 0)
-		goto out;
 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
 	encode_compound_hdr(&xdr, &hdr);
 	status = encode_putfh(&xdr, args->fh);