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qcow2: Prepare count_contiguous_clusters() for external data file 

Offset 0 can be valid for normal (allocated) clusters now, so use
qcow2_get_cluster_type() instead.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-01-18 13:44:40 +01:00
parent a4ea184d8a
commit b8c8353a38
1 changed files with 2 additions and 2 deletions
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4
block/qcow2-cluster.c
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@ -389,12 +389,12 @@ static int count_contiguous_clusters(BlockDriverState *bs, int nb_clusters,
uint64_t first_entry = be64_to_cpu(l2_slice[0]);
uint64_t offset = first_entry & mask;
if (!offset) {
first_cluster_type = qcow2_get_cluster_type(bs, first_entry);
if (first_cluster_type == QCOW2_CLUSTER_UNALLOCATED) {
return 0;
}
/* must be allocated */
first_cluster_type = qcow2_get_cluster_type(bs, first_entry);
assert(first_cluster_type == QCOW2_CLUSTER_NORMAL ||
first_cluster_type == QCOW2_CLUSTER_ZERO_ALLOC);