[sheepdog] [PATCH] sheep: update sd_store only when the correct driver name is specified

[MORITA Kazutaka]

Users may run 'collie cluster format -b ?' to get the store driver
list.  In such cases, we shouldn't update sd_store.

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 sheep/ops.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sheep/ops.c b/sheep/ops.c
index 1b35552..b4df70f 100644
--- a/sheep/ops.c
+++ b/sheep/ops.c
@@ -218,11 +218,13 @@ static int cluster_make_fs(const struct sd_req *req, struct sd_rsp *rsp,
 	uint32_t latest_epoch;
 	uint64_t created_time;
 	struct siocb iocb = { 0 };
+	struct store_driver *driver;
 
-	sd_store = find_store_driver(data);
-	if (!sd_store)
+	driver = find_store_driver(data);
+	if (!driver)
 		return SD_RES_NO_STORE;
 
+	sd_store = driver;
 	latest_epoch = get_latest_epoch();
 	iocb.epoch = latest_epoch;
 	sd_store->format(&iocb);
-- 
1.7.2.5