xfs: re-order initial space accounting checks in xlog_write

	bool			need_start_rec)

{

	struct xlog_in_core	*iclog = NULL;

	struct xfs_log_iovec	*vecp;

	struct xfs_log_vec	*lv;

	struct xfs_log_vec	*lv = log_vector;

	struct xfs_log_iovec	*vecp = lv->lv_iovecp;

	int			index = 0;

	int			len;

	int			index;

	int			partial_copy = 0;

	int			partial_copy_len = 0;

	int			contwr = 0;

	int			data_cnt = 0;

	int			error = 0;

	*start_lsn = 0;

	/*

	 * Region headers and bytes are already accounted for.  We only need to

	 * take into account start records and split regions in this function.

	 * If this is a commit or unmount transaction, we don't need a start

	 * record to be written.  We do, however, have to account for the

	 * commit or unmount header that gets written. Hence we always have

	 * to account for an extra xlog_op_header here.

	 */

	if (ticket->t_flags & XLOG_TIC_INITED) {

	ticket->t_curr_res -= sizeof(struct xlog_op_header);

	if (ticket->t_flags & XLOG_TIC_INITED)

		ticket->t_flags &= ~XLOG_TIC_INITED;

	}

	/*

	 * Commit record headers and unmount records need to be accounted for.

	 * These come in as separate writes so are easy to detect.

	 */

	if (!need_start_rec)

		ticket->t_curr_res -= sizeof(struct xlog_op_header);

	if (ticket->t_curr_res < 0) {

		xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,

		     "ctx ticket reservation ran out. Need to up reservation");

	}

	len = xlog_write_calc_vec_length(ticket, log_vector, need_start_rec);

	index = 0;

	lv = log_vector;

	vecp = lv->lv_iovecp;

	*start_lsn = 0;

	while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) {

		void		*ptr;

		int		log_offset;