[Qemu-devel] [RFC PATCH 11/14] allow writing to the backing file

[Wen Congyang]

Signed-off-by: Wen Congyang <address@hidden>
Signed-off-by: zhanghailiang <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
 block.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index 067c44b..96cf973 100644
--- a/block.c
+++ b/block.c
@@ -856,8 +856,8 @@ static int bdrv_inherited_flags(int flags)
  */
 static int bdrv_backing_flags(int flags)
 {
-    /* backing files always opened read-only */
-    flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ);
+    /* backing files are opened read-write for block replication */
+    flags &= ~BDRV_O_COPY_ON_READ;
 
     /* snapshot=on is handled on the top layer */
     flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY);
-- 
2.1.0