//! Two independent read-only opens and a write/create refusal.

use super::*;
use os_vfs_lookup::{LookupTable, Mount};
use os_vfs_open::{Error as OpenError, OpenFlags, OpenTable};

pub fn run(allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let frames_before = allocator.remaining_pages();
    let first = Mount::new(1, 11, b"dosya").map_err(|_| "k1565-first")?;
    let second = Mount::new(2, 22, b"dosya").map_err(|_| "k1565-second")?;
    let lookup = LookupTable::new(first, second).map_err(|_| "k1565-lookup")?;
    let dentry = lookup.lookup(1, b"dosya").map_err(|_| "k1565-dentry")?;
    let mut opens = OpenTable::new();
    let one = opens.open(&lookup, dentry, OpenFlags::READ_ONLY)
        .map_err(|_| "k1565-open-one")?;
    let two = opens.open(&lookup, dentry, OpenFlags::READ_ONLY)
        .map_err(|_| "k1565-open-two")?;
    if one.id != 1 || two.id != 2 || one.id == two.id
        || one.inode != 11 || two.inode != 11 || opens.active_handles() != 2 {
        return Err("k1565-independent");
    }
    let before = opens;
    let write_create = OpenFlags { read: true, write: true, create: true };
    if opens.open(&lookup, dentry, write_create) != Err(OpenError::Erofs)
        || opens != before || opens.active_handles() != 2
        || allocator.remaining_pages() != frames_before {
        return Err("k1565-erofs");
    }
    opens.close(one).map_err(|_| "k1565-close-one")?;
    opens.close(two).map_err(|_| "k1565-close-two")?;
    if opens.active_handles() != 0 || allocator.remaining_pages() != frames_before {
        return Err("k1565-close-count");
    }
    write_line("TURKOS/OS/K1565-OPEN: READS=2 EROFS=WRITE_CREATE HANDLES=UNCHANGED FRAMES=UNCHANGED");
    Ok(())
}