//! Transactional metadata growth from one to three separate blocks.

use super::*;
use os_turkfs_allocation::{Bitmap, Error, ExtentFile};

const RESERVED: u64 = 0x1f;

pub fn run(allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let frames_before = allocator.remaining_pages();
    let all = (1u64 << 32) - 1;
    let mut bitmap = Bitmap::validate(32, RESERVED,
        all & !(1u64 << 20) & !(1u64 << 30))
        .map_err(|_| "k1630-valid-bitmap")?;
    let mut file = ExtentFile::one_block(10, &bitmap)
        .map_err(|_| "k1630-valid-file")?;
    if file.grow_to_three(&mut bitmap) != Ok(())
        || file.count() != 3 || file.blocks() != [10, 20, 30]
        || bitmap.counts().free != 0 {
        return Err("k1630-grow");
    }
    write_line("TURKOS/OS/K1630-GROW: EXTENTS=10,20,30");

    let mut limited = Bitmap::validate(32, RESERVED, all & !(1u64 << 20))
        .map_err(|_| "k1630-limited-bitmap")?;
    let mut old = ExtentFile::one_block(10, &limited)
        .map_err(|_| "k1630-old-file")?;
    let limited_before = limited;
    let old_before = old;
    if old.grow_to_three(&mut limited) != Err(Error::NoSpace) {
        return Err("k1630-no-space");
    }
    write_line("TURKOS/OS/K1630-GROW: SECOND=ENOSPC");
    if old != old_before || limited != limited_before
        || old.blocks()[0] != 10 || old.count() != 1 {
        return Err("k1630-rollback");
    }
    write_line("TURKOS/OS/K1630-GROW: OLD-INODE-BITMAP=UNCHANGED");
    if allocator.remaining_pages() != frames_before {
        return Err("k1630-frames");
    }
    write_line("TURKOS/OS/K1630-GROW: FRAMES=UNCHANGED");
    Ok(())
}