dm-snapshot: fix performance degradation due to small hash size

[pandora-kernel.git] / drivers / md / dm-snap.c

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index b4aaa7b..5c30316 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -721,17 +721,16 @@ static int calc_max_buckets(void)
  */
 static int init_hash_tables(struct dm_snapshot *s)
 {
-       sector_t hash_size, cow_dev_size, origin_dev_size, max_buckets;
+       sector_t hash_size, cow_dev_size, max_buckets;
 
        /*
         * Calculate based on the size of the original volume or
         * the COW volume...
         */
        cow_dev_size = get_dev_size(s->cow->bdev);
-       origin_dev_size = get_dev_size(s->origin->bdev);
        max_buckets = calc_max_buckets();
 
-       hash_size = min(origin_dev_size, cow_dev_size) >> s->store->chunk_shift;
+       hash_size = cow_dev_size >> s->store->chunk_shift;
        hash_size = min(hash_size, max_buckets);
 
        if (hash_size < 64)