fs/xfs/xfs_log_recover.c

277 	xfs_daddr_t	mid_blk;
283 	mid_blk = BLK_AVG(first_blk, end_blk);
284 	while (mid_blk != first_blk && mid_blk != end_blk) {
285 		error = xlog_bread(log, mid_blk, 1, buffer, &offset);
290 			end_blk = mid_blk;   /* last_half_cycle == mid_cycle */
292 			first_blk = mid_blk; /* first_half_cycle == mid_cycle */
293 		mid_blk = BLK_AVG(first_blk, end_blk);
295 	ASSERT((mid_blk == first_blk && mid_blk+1 == end_blk) ||
296 	       (mid_blk == end_blk && mid_blk-1 == first_blk));