block: add bdrv_set_enable_write_cache

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index 9bff401..e4396a6 100644
--- a/block.c
+++ b/block.c
@@ -2380,6 +2380,11 @@
     return bs->enable_write_cache;
 }
 
+void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce)
+{
+    bs->enable_write_cache = wce;
+}
+
 int bdrv_is_encrypted(BlockDriverState *bs)
 {
     if (bs->backing_hd && bs->backing_hd->encrypted)