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| author | Sandeep K Sinha <sandeepksinha@gmail.com> | 2009-06-16 16:57:08 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2009-06-16 16:57:08 +1000 |
| commit | aece3d1f40879759f641dfbfdbb9e2593adeb43c (patch) | |
| tree | 0264ac8e02f4d08472c11b04305f8c39695d9007 /drivers/md/linear.c | |
| parent | 4db7cdc859f56ecf0a186e0cfb238b5bb3af2efb (diff) | |
| download | lwn-aece3d1f40879759f641dfbfdbb9e2593adeb43c.tar.gz lwn-aece3d1f40879759f641dfbfdbb9e2593adeb43c.zip | |
md: Binary search in linear raid
Replace the linear search with binary search in which_dev.
Signed-off-by: Sandeep K Sinha <sandeepksinha@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/linear.c')
| -rw-r--r-- | drivers/md/linear.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 529a3d37e3fe..9b02a73fbc6b 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -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; } /** |