[sheepdog] [PATCH 1/3] sheepdog: turn on cache flag of write request

[Hitoshi Mitake]

tgtd doesn't affect semantics of caching, so we can always turn on
cache feature of sheepdog layer.

Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
---
 usr/bs_sheepdog.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/usr/bs_sheepdog.c b/usr/bs_sheepdog.c
index 6d60bd6..a333675 100644
--- a/usr/bs_sheepdog.c
+++ b/usr/bs_sheepdog.c
@@ -795,13 +795,19 @@ retry:
 		old_oid = 0;
 
 		if (write) {
+			/*
+			 * tgt doesn't affect semantics of caching, so we can
+			 * always turn on cache of sheep layer
+			 */
+			flags = SD_FLAG_CMD_CACHE;
+
 			if (ai->inode.data_vdi_id[idx] != vid) {
 				create = 1;
 
 				if (ai->inode.data_vdi_id[idx]) {
 					/* COW */
 					old_oid = oid;
-					flags = SD_FLAG_CMD_COW;
+					flags |= SD_FLAG_CMD_COW;
 				}
 
 				oid = vid_to_data_oid(ai->inode.vdi_id, idx);
-- 
1.9.1