[Sheepdog] [PATCH 1/2] object cache: fix cow write

[Liu Yuan]

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

We should bypass object cache for COW object writing, because
we simply shouldn't create COW object without fetching it first
from the cluster storage

Signed-off-by: Liu Yuan <tailai.ly at taobao.com>
---
 sheep/store.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/sheep/store.c b/sheep/store.c
index 1a2deb7..d26aded 100644
--- a/sheep/store.c
+++ b/sheep/store.c
@@ -869,7 +869,8 @@ static int bypass_object_cache(struct sd_obj_req *hdr)
 	/*
 	 * For vmstate && vdi_attr object, we don't do caching
 	 */
-	if (is_vmstate_obj(oid) || is_vdi_attr_obj(oid))
+	if (is_vmstate_obj(oid) || is_vdi_attr_obj(oid) ||
+	    hdr->flags & SD_FLAG_CMD_COW)
 		return 1;
 	return 0;
 }
-- 
1.7.8.2