From: Peter Lieven <p...@kamp.de>
if multiple sectors spanning multiple clusters are read the
function count_contiguous_clusters should ensure that the
cluster type should not change between the clusters.
Especially the for-loop should break when we have one
or more normal clusters followed by a compressed cluster.
Unfortunately the wrong macro was used in the mask to
compare the flags.
This was discovered while debugging a data corruption
issue when converting a compressed qcow2 image to raw.
qemu-img reads 2MB chunks which span multiple clusters.
CC: qemu-sta...@nongnu.org
Signed-off-by: Peter Lieven <p...@kamp.de>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
(cherry picked from commit 78a52ad5acca7053b774fcc80290e7b7e224c80a)
Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com>
---
block/qcow2-cluster.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index fd3054b..b558eb0 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -266,7 +266,7 @@ static int count_contiguous_clusters(uint64_t nb_clusters,
int cluster_size,
uint64_t *l2_table, uint64_t start, uint64_t stop_flags)
{
int i;
- uint64_t mask = stop_flags | L2E_OFFSET_MASK | QCOW2_CLUSTER_COMPRESSED;
+ uint64_t mask = stop_flags | L2E_OFFSET_MASK | QCOW_OFLAG_COMPRESSED;
uint64_t first_entry = be64_to_cpu(l2_table[0]);
uint64_t offset = first_entry & mask;
--
1.7.9.5
