btrfs_comp_keys
ret = btrfs_comp_keys(&first_key, key);
ret = btrfs_comp_keys(&found_key, &orig_key);
ret = btrfs_comp_keys(&found_key, &key);
if (unlikely(btrfs_comp_keys(&disk_key, new_key) >= 0)) {
if (unlikely(btrfs_comp_keys(&disk_key, new_key) <= 0)) {
ret = btrfs_comp_keys(tmp, key);
if (!progress_passed && btrfs_comp_keys(&disk_key, progress) < 0)