[sheepdog] [PATCH] sheep: correct read_epoch()

[Liu Yuan]

From: Liu Yuan <tailai.ly at taobao.com>

When startup the cluster for the first time, we would get the following message:

Jun 06 17:29:32 read_epoch(525) failed to read epoch 0

This should be printed because cluster doesn't go error.

Signed-off-by: Liu Yuan <tailai.ly at taobao.com>
---
 sheep/store.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/sheep/store.c b/sheep/store.c
index ad9883e..a9ae398 100644
--- a/sheep/store.c
+++ b/sheep/store.c
@@ -519,6 +519,9 @@ int read_epoch(uint32_t *epoch, uint64_t *ct,
 	int ret;
 
 	*epoch = get_latest_epoch();
+	if (*epoch == 0)
+		return SD_RES_EIO;
+
 	ret = epoch_log_read(*epoch, (char *)entries,
 			     *nr_entries * sizeof(*entries));
 	if (ret == -1) {
-- 
1.7.10.2