[Qemu-devel] [PATCH] qcow2: Free preallocated zero clusters

[Max Reitz]

In qcow2_free_any_clusters, preallocated zero clusters should be freed
just as normal clusters are.

Signed-off-by: Max Reitz <address@hidden>
---
 block/qcow2-refcount.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 2d67885..9dd5e44 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -796,11 +796,13 @@ void qcow2_free_any_clusters(BlockDriverState *bs, 
uint64_t l2_entry,
         }
         break;
     case QCOW2_CLUSTER_NORMAL:
-        qcow2_free_clusters(bs, l2_entry & L2E_OFFSET_MASK,
-                            nb_clusters << s->cluster_bits, type);
+    case QCOW2_CLUSTER_ZERO:
+        if (l2_entry & L2E_OFFSET_MASK) {
+            qcow2_free_clusters(bs, l2_entry & L2E_OFFSET_MASK,
+                                nb_clusters << s->cluster_bits, type);
+        }
         break;
     case QCOW2_CLUSTER_UNALLOCATED:
-    case QCOW2_CLUSTER_ZERO:
         break;
     default:
         abort();
-- 
1.8.3.1