block: Remove BDRV_O_COPY_ON_READ for bs->file
Copy on Read makes sense on the format level where backing files are implemented, but it's not required on the protocol level. While it shouldn't actively break anything to have COR enabled on both layers, needless serialisation and allocation checks may impact performance. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
Showing
想要评论请 注册 或 登录