a209f4615c
Since commit 1dc936aa84 (virtio-blk: Use blk_aio_ioctl) we silently lose the request if blk_aio_ioctl returns NULL (not implemented). Fix it by directly returning VIRTIO_BLK_S_UNSUPP as we used to do. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [ kwolf: Fixed build error on win32 ] Signed-off-by: Kevin Wolf <kwolf@redhat.com>