From 4ba5e9017697c98436f0543c075b3982968fe30c Mon Sep 17 00:00:00 2001
From: Ziye Yang <ziye.yang@intel.com>
Date: Wed, 5 Aug 2020 00:09:09 +0800
Subject: [PATCH] nbd: Add the O_DIRECT flag when opening the file.

To eliminate the cache issue.

Signed-off-by: Ziye Yang <ziye.yang@intel.com>
Change-Id: Id67fabb901de9666e6bad04c9df74a538bdbc659
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3662
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Sun Zhenyuan <sunzhenyuan@baidu.com>
---
 lib/nbd/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/nbd/nbd.c b/lib/nbd/nbd.c
index 7d96b9315..56fe037d9 100644
--- a/lib/nbd/nbd.c
+++ b/lib/nbd/nbd.c
@@ -1060,7 +1060,7 @@ spdk_nbd_start(const char *bdev_name, const char *nbd_path,
 		goto err;
 	}
 
-	nbd->dev_fd = open(nbd_path, O_RDWR);
+	nbd->dev_fd = open(nbd_path, O_RDWR | O_DIRECT);
 	if (nbd->dev_fd == -1) {
 		SPDK_ERRLOG("open(\"%s\") failed: %s\n", nbd_path, spdk_strerror(errno));
 		rc = -errno;