1744     Coroutine *io_co;  member
1773         s->io_co = qemu_coroutine_self();  in bdrv_replace_test_co_preadv()
1778         s->io_co = NULL;  in bdrv_replace_test_co_preadv()
1801     while (s->io_co) {  in bdrv_replace_test_drain_co()
1802         aio_co_wake(s->io_co);  in bdrv_replace_test_drain_co()
1803         s->io_co = NULL;  in bdrv_replace_test_drain_co()
1935     Coroutine *io_co;  in do_test_replace_child_mid_drain()  local
1980         io_co = qemu_coroutine_create(test_replace_child_mid_drain_read_co,  in do_test_replace_child_mid_drain()
1982         qemu_coroutine_enter(io_co);  in do_test_replace_child_mid_drain()