NFSD: Update the NFSv3 GETACL argument decoder to use struct xdr_stream

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

fs/nfsd/nfs3acl.c

@@ -124,19 +124,20 @@ static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
 /*
  * XDR decode functions
  */
+
 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
+	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_getaclargs *args = rqstp->rq_argp;
 
-	p = nfs3svc_decode_fh(p, &args->fh);
-	if (!p)
+	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+		return 0;
+	if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
 		return 0;
-	args->mask = ntohl(*p); p++;
 
-	return xdr_argsize_check(rqstp, p);
+	return 1;
 }
 
-
 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
 	struct nfsd3_setaclargs *args = rqstp->rq_argp;

fs/nfsd/nfs3xdr.c

@@ -53,7 +53,16 @@ svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
 	return true;
 }
 
-static bool
+/**
+ * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
+ * @xdr: XDR stream positioned at an undecoded NFSv3 FH
+ * @fhp: OUT: filled-in server file handle
+ *
+ * Return values:
+ *  %false: The encoded file handle was not valid
+ *  %true: @fhp has been initialized
+ */
+bool
 svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
 {
 	__be32 *p;

fs/nfsd/xdr3.h

@@ -308,6 +308,7 @@ int nfs3svc_encode_entry_plus(void *, const char *name,
 __be32 *nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p,
 				struct svc_fh *fhp);
 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp);
+bool svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp);
 
 
 #endif /* _LINUX_NFSD_XDR3_H */