From 2f0342efdbb0a3c5b5a6a4f4831cbe90c445510b Mon Sep 17 00:00:00 2001
From: "Denis V. Lunev" <den@openvz.org>
Date: Thu, 14 Jul 2016 16:33:26 +0300
Subject: [PATCH] block: remove extra condition in
 bdrv_can_write_zeroes_with_unmap

All .bdrv_co_write_zeroes callbacks nowadays work perfectly even
with backing store attached. If future new callbacks would be unable to do
that - they have a chance to block this in bdrv_get_info().

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1468503209-19498-6-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Jeff Cody <jcody@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
---
 block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block.c b/block.c
index d2dac3dce9..30d64e6ca5 100644
--- a/block.c
+++ b/block.c
@@ -2837,7 +2837,7 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
 {
     BlockDriverInfo bdi;
 
-    if (bs->backing || !(bs->open_flags & BDRV_O_UNMAP)) {
+    if (!(bs->open_flags & BDRV_O_UNMAP)) {
         return false;
     }