Function qcow_async_tempfile

performance-metrics/src/util.rs:70–75

Create a QCOW2 image with `num_clusters` allocated clusters opened via QcowDisk with io_uring backend.

(num_clusters: usize)

/// Create a QCOW2 image with `num_clusters` allocated clusters opened
/// via QcowDisk with io_uring backend.
pub fn qcow_async_tempfile(num_clusters: usize) -> (TempFile, QcowDisk) {
    let tmp = create_qcow_tempfile(num_clusters);
    let disk = QcowDisk::new(tmp.as_file().try_clone().unwrap(), false, false, true, true)
        .expect("failed to open QCOW2 via QcowDisk");
    (tmp, disk)
}

/// Drain `count` completions from a synchronous async_io backend.
pub fn drain_completions(async_io: &mut dyn AsyncIo, count: usize) {