From: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
Date: Wed, 3 Jul 2013 22:01:04 +0000 (-0700)
Subject: ocfs2: submit disk heartbeat bio using WRITE_SYNC
X-Git-Tag: accepted/tizen/common/20141203.182822~1935^2~424
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e873fdb5259ac62cf099621590645470c12a1d21;p=platform%2Fkernel%2Flinux-arm64.git

ocfs2: submit disk heartbeat bio using WRITE_SYNC

Under heavy I/O load, writing the disk heartbeat can be forced to wait for
minutes, and this causes the node to be fenced.

This patch tries to use WRITE_SYNC in submitting the heartbeat bio, so
that writing the heartbeat will have a priority over other requests.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
Acked-by: Tao Ma <tm@tao.ma>
Acked-by: Sunil Mushran <sunil.mushran@gmail.com>
Cc: Srinivas Eeeda <srinivas.eeda@oracle.com>
Reviewed-by: Jie Liu <jeff.liu@oracle.com>
Tested-by: Gurudas Pai <gurudas.pai@oracle.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 42252bf..f89b46b 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -500,7 +500,7 @@ static int o2hb_issue_node_write(struct o2hb_region *reg,
 	}
 
 	atomic_inc(&write_wc->wc_num_reqs);
-	submit_bio(WRITE, bio);
+	submit_bio(WRITE_SYNC, bio);
 
 	status = 0;
 bail: