From 2d939b5a9f5717aba21727f635c6da898123ad5b Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Fri, 2 May 2014 16:06:20 +0200
Subject: [PATCH 02/31] qcow2: Free preallocated zero clusters

RH-Author: Max Reitz <mreitz@redhat.com>
Message-id: <1399046781-16359-2-git-send-email-mreitz@redhat.com>
Patchwork-id: 58644
O-Subject: [RHEL-7.0 qemu-kvm PATCH 1/2] qcow2: Free preallocated zero clusters
Bugzilla: 1052093
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>

BZ: 1052093

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

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 8f730dd24edd2576ecbd596de7ea4361296b129c)

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

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/qcow2-refcount.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 73ae4e3..429b01c 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -811,11 +811,13 @@ 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();
-- 
1.7.1