[PATCH] Fix err in size calculation for readdir response.

If the 'data' component of a readdir response is
exactly one page (the max allowed) then we currently
only send 0 bytes of it, instead of PAGE_SIZE bytes.

fs/nfsd/nfs3xdr.c

@@ -760,7 +760,7 @@ nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
 		p = resp->buffer;
 		*p++ = 0;		/* no more entries */
 		*p++ = htonl(resp->common.err == nfserr_eof);
-		rqstp->rq_res.page_len = ((unsigned long)p & ~PAGE_MASK);
+		rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
 		return 1;
 	} else
 		return xdr_ressize_check(rqstp, p);

fs/nfsd/nfsxdr.c

@@ -430,7 +430,7 @@ nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
 	p = resp->buffer;
 	*p++ = 0;			/* no more entries */
 	*p++ = htonl((resp->common.err == nfserr_eof));
-	rqstp->rq_res.page_len = ((unsigned long)p & ~PAGE_MASK);
+	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
 
 	return 1;
 }