diff --git a/block.c b/block.c
index 1ef4ae5..39b27b2 100644
--- a/block.c
+++ b/block.c
@@ -1675,3 +1675,25 @@
         return drv->bdrv_ioctl(bs, req, buf);
     return -ENOTSUP;
 }
+
+int bdrv_sg_send_command(BlockDriverState *bs, void *buf, int count)
+{
+    return bdrv_pwrite(bs, -1, buf, count);
+}
+
+int bdrv_sg_recv_response(BlockDriverState *bs, void *buf, int count)
+{
+    return bdrv_pread(bs, -1, buf, count);
+}
+
+BlockDriverAIOCB *bdrv_sg_aio_read(BlockDriverState *bs, void *buf, int count,
+                                   BlockDriverCompletionFunc *cb, void *opaque)
+{
+    return bdrv_aio_read(bs, 0, buf, -(int64_t)count, cb, opaque);
+}
+
+BlockDriverAIOCB *bdrv_sg_aio_write(BlockDriverState *bs, void *buf, int count,
+                                    BlockDriverCompletionFunc *cb, void *opaque)
+{
+    return bdrv_aio_write(bs, 0, buf, -(int64_t)count, cb, opaque);
+}