From 3947809c366a555f9ba05f12e55b41609a4c41ef Mon Sep 17 00:00:00 2001
From: Rob Bradford <robert.bradford@intel.com>
Date: Wed, 20 May 2020 10:52:13 +0100
Subject: [PATCH] vm-virtio: block: Ensure that VIRTIO_BLK_T_FLUSH requests
 actually sync

The implementation of this virtio block (and vhost-user block) command
called a function that was a no-op on Linux. Use the same function as
virtio-pmem to ensure that data is not lost when the guest asks for it
to be flused to disk.

Fixes: #399

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
---
 vm-virtio/src/block.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vm-virtio/src/block.rs b/vm-virtio/src/block.rs
index b009ba41d..7b4faacbf 100755
--- a/vm-virtio/src/block.rs
+++ b/vm-virtio/src/block.rs
@@ -351,7 +351,7 @@ impl Write for RawFile {
     }
 
     fn flush(&mut self) -> std::io::Result<()> {
-        self.file.flush()
+        self.file.sync_all()
     }
 }