block: Introduce buf register API
Allow block driver to map and unmap a buffer for later I/O, as a performance hint. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-Id: <20180116060901.17413-5-famz@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
Showing
想要评论请 注册 或 登录