A new physical cluster with the same hash value will be used for further
occurrence of this hash.
Signed-off-by: Benoit Canet <ben...@irqsave.net>
---
block/qcow2-dedup.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/block/qcow2-dedup.c b/block/qcow2-dedup.c
index 2d2c15c..da4ad5c 100644
--- a/block/qcow2-dedup.c
+++ b/block/qcow2-dedup.c
@@ -305,12 +305,24 @@ static int qcow2_deduplicate_cluster(BlockDriverState *bs,
{
BDRVQcowState *s = bs->opaque;
uint64_t cluster_index = hash_info->physical_sect / s->cluster_sectors;
- int ret = 0;
+ int refcount, ret = 0;
/* Increment the refcount of the cluster */
- ret = qcow2_update_cluster_refcount(bs,
- cluster_index,
- 1);
+ refcount = qcow2_update_cluster_refcount(bs,
+ cluster_index,
+ 1);
+
+ if (refcount < 0) {
+ return refcount;
+ }
+
+ /* if we reached half the max refcount delete the QCowHashInfo from the
+ * store so the next time this cluster will be seen it will be handled as
+ * new
+ */
+ if (refcount >= 0xFFFF/2) {
+ ret = qcow2_store_delete(bs, &s->key_value_store, hash_info);
+ }
if (ret < 0) {
return ret;
--
1.7.10.4
