[sheepdog] [PATCH 2/3] sheep: don't send unnecessary data on error

[MORITA Kazutaka]

This will save network traffic in some cases.

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 sheep/request.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/sheep/request.c b/sheep/request.c
index ae12bd3..723666c 100644
--- a/sheep/request.c
+++ b/sheep/request.c
@@ -123,6 +123,7 @@ static int check_request_epoch(struct request *req)
 		/* ask gateway to retry. */
 		req->rp.result = SD_RES_OLD_NODE_VER;
 		req->rp.epoch = sys->epoch;
+		req->rp.data_length = 0;
 		put_request(req);
 		return -1;
 	} else if (after(req->rq.epoch, sys->epoch)) {
@@ -341,25 +342,30 @@ static void queue_request(struct request *req)
 	switch (sys->status) {
 	case SD_STATUS_KILLED:
 		rsp->result = SD_RES_KILLED;
+		rsp->data_length = 0;
 		goto done;
 	case SD_STATUS_SHUTDOWN:
 		rsp->result = SD_RES_SHUTDOWN;
+		rsp->data_length = 0;
 		goto done;
 	case SD_STATUS_WAIT_FOR_FORMAT:
 		if (!is_force_op(req->op)) {
 			rsp->result = SD_RES_WAIT_FOR_FORMAT;
+			rsp->data_length = 0;
 			goto done;
 		}
 		break;
 	case SD_STATUS_WAIT_FOR_JOIN:
 		if (!is_force_op(req->op)) {
 			rsp->result = SD_RES_WAIT_FOR_JOIN;
+			rsp->data_length = 0;
 			goto done;
 		}
 		break;
 	case SD_STATUS_HALT:
 		if (!is_force_op(req->op)) {
 			rsp->result = SD_RES_HALT;
+			rsp->data_length = 0;
 			goto done;
 		}
 		break;
-- 
1.7.2.5