Commit aece3d1f authored by Sandeep K Sinha's avatar Sandeep K Sinha Committed by NeilBrown
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md: Binary search in linear raid 



Replace the linear search with binary search in which_dev.

Signed-off-by: default avatarSandeep K Sinha <sandeepksinha@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 4db7cdc8

drivers/md/linear.c

+17 −5
Original line number Diff line number Diff line
@@ -27,14 +27,26 @@ 
 */

static inline dev_info_t *which_dev(mddev_t *mddev, sector_t sector)

{

	dev_info_t *hash;

	int lo, mid, hi;

	linear_conf_t *conf = mddev->private;



	hash = conf->disks;

	lo = 0;

	hi = mddev->raid_disks - 1;



	while (sector >= hash->end_sector)

		hash++;

	return hash;

	/*

	 * Binary Search

	 */



	while (hi > lo) {



		mid = (hi + lo) / 2;

		if (sector < conf->disks[mid].end_sector)

			hi = mid;

		else

			lo = mid + 1;

	}



	return conf->disks + lo;

}



/**