NFSD: Update the NFSv2 SETACL argument decoder to use struct xdr_stream

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs2acl.c

@@ -201,28 +201,23 @@ static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 
 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
+	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
-	struct kvec *head = rqstp->rq_arg.head;
-	unsigned int base;
-	int n;
 
-	p = nfs2svc_decode_fh(p, &argp->fh);
-	if (!p)
+	if (!svcxdr_decode_fhandle(xdr, &argp->fh))
+		return 0;
+	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
+		return 0;
+	if (argp->mask & ~NFS_ACL_MASK)
 		return 0;
-	argp->mask = ntohl(*p++);
-	if (argp->mask & ~NFS_ACL_MASK ||
-	    !xdr_argsize_check(rqstp, p))
+	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
+				   &argp->acl_access : NULL))
+		return 0;
+	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
+				   &argp->acl_default : NULL))
 		return 0;
 
-	base = (char *)p - (char *)head->iov_base;
-	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
-			  (argp->mask & NFS_ACL) ?
-			  &argp->acl_access : NULL);
-	if (n > 0)
-		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
-				  (argp->mask & NFS_DFACL) ?
-				  &argp->acl_default : NULL);
-	return (n > 0);
+	return 1;
 }
 
 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)

fs/nfsd/xdr3.h

@@ -108,7 +108,7 @@ struct nfsd3_getaclargs {
 struct posix_acl;
 struct nfsd3_setaclargs {
 	struct svc_fh		fh;
-	int			mask;
+	__u32			mask;
 	struct posix_acl	*acl_access;
 	struct posix_acl	*acl_default;
 };