xfs_free_extent_fix_freelist(
	struct xfs_trans	*tp,
	xfs_agnumber_t		agno,
	struct xfs_buf		**agbp)
{
	struct xfs_alloc_arg	args;
	int			error;

	memset(&args, 0, sizeof(struct xfs_alloc_arg));
	args.tp = tp;
	args.mp = tp->t_mountp;
	args.agno = agno;

	/*
	 * validate that the block number is legal - the enables us to detect
	 * and handle a silent filesystem corruption rather than crashing.
	 */
	if (args.agno >= args.mp->m_sb.sb_agcount)
		return -EFSCORRUPTED;

	args.pag = xfs_perag_get(args.mp, args.agno);
	ASSERT(args.pag);

	error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING);
	if (error)
		goto out;

	*agbp = args.agbp;
out:
	xfs_perag_put(args.pag);
	return error;
}
Unknown