NFSD: Restructure nfsd4_encode_create_session()

Convert nfsd4_encode_create_session() to use the conventional XDR
encoding utilities.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs4xdr.c

@@ -4826,16 +4826,19 @@ nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
 {
 	struct nfsd4_create_session *sess = &u->create_session;
 	struct xdr_stream *xdr = resp->xdr;
-	__be32 *p;
-
-	p = xdr_reserve_space(xdr, 24);
-	if (!p)
-		return nfserr_resource;
-	p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
-					NFS4_MAX_SESSIONID_LEN);
-	*p++ = cpu_to_be32(sess->seqid);
-	*p++ = cpu_to_be32(sess->flags);
 
+	/* csr_sessionid */
+	nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid);
+	if (nfserr != nfs_ok)
+		return nfserr;
+	/* csr_sequence */
+	nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
+	if (nfserr != nfs_ok)
+		return nfserr;
+	/* csr_flags */
+	nfserr = nfsd4_encode_uint32_t(xdr, sess->flags);
+	if (nfserr != nfs_ok)
+		return nfserr;
 	/* csr_fore_chan_attrs */
 	nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel);
 	if (nfserr != nfs_ok)

fs/nfsd/xdr4.h

@@ -96,6 +96,7 @@ nfsd4_encode_uint32_t(struct xdr_stream *xdr, u32 val)
 #define nfsd4_encode_count4(x, v)	nfsd4_encode_uint32_t(x, v)
 #define nfsd4_encode_mode4(x, v)	nfsd4_encode_uint32_t(x, v)
 #define nfsd4_encode_nfs_lease4(x, v)	nfsd4_encode_uint32_t(x, v)
+#define nfsd4_encode_sequenceid4(x, v)	nfsd4_encode_uint32_t(x, v)
 
 /**
  * nfsd4_encode_uint64_t - Encode an XDR uint64_t type result