//! Disposable queue-budget rejection followed by real block progress.

use super::*;

pub fn run(boot: &BootData,
    allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let mut disk = virtio_ro_turkfs::RoDisk::open(
        boot, allocator, "TURKOS/OS/K1500-GET")?;
    let mut first = [0xa5u8; 512];
    let mut second = [0xa5u8; 512];
    disk.read(0, &mut first)?;
    if !disk.backpressure_rejected() { return Err("k1500-no-eagain"); }
    disk.read(1, &mut second)?;
    if first.iter().any(|&byte| byte != 0)
        || second.iter().any(|&byte| byte != 0) {
        return Err("k1500-read-data");
    }
    disk.close(allocator)?;
    write_line("TURKOS/OS/K1500-BACKPRESSURE: QSIZE=4 FIRST=3 EXTRA=EAGAIN RETRY=COMPLETE GETS=2 DATA=ZERO OWNERS=0 FRAMES=RETURNED");
    Ok(())
}