pnfs/flexfiles: do not mark delay-like status as DS failure

We just need to delay and retry in these cases.
Signed-off-by: NPeng Tao <tao.peng@primarydata.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/flexfilelayout/flexfilelayout.c

@@ -1188,6 +1188,14 @@ static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
 		}
 	}
 
+	switch (status) {
+	case NFS4ERR_DELAY:
+	case NFS4ERR_GRACE:
+		return;
+	default:
+		break;
+	}
+
 	mirror = FF_LAYOUT_COMP(lseg, idx);
 	err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
 				       mirror, offset, length, status, opnum,
@@ -1399,7 +1407,6 @@ static int ff_layout_write_done_cb(struct rpc_task *task,
 		ff_layout_reset_write(hdr, false);
 		return task->tk_status;
 	case -EAGAIN:
-		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}