From 6fe151ae1dc6d4faafe8973d7233006909237804 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penberg@kernel.org>
Date: Sat, 9 Jul 2011 10:37:58 +0300
Subject: [PATCH] kvm tools, qcow: Don't fdatasync() L2 table writeout

There's now now point in making sure new L2 tables actually hit the disk before
we write out data to clusters because they are not visible on-disk until
qcow_disk_flush() is called which flushes the L1 table.

Cc: Asias He <asias.hejun@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 disk/qcow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/disk/qcow.c b/disk/qcow.c
index 0fef92f..35408ab 100644
--- a/disk/qcow.c
+++ b/disk/qcow.c
@@ -345,7 +345,7 @@ static u64 qcow_write_l2_table(struct qcow *q, u64 *table)
 	clust_sz	= 1 << header->cluster_bits;
 	off		= ALIGN(f_sz, clust_sz);
 
-	if (qcow_pwrite_sync(q->fd, table, sz * sizeof(u64), off) < 0)
+	if (pwrite_in_full(q->fd, table, sz * sizeof(u64), off) < 0)
 		return 0;
 
 	return off;