diff options
| -rw-r--r-- | block/qcow2-cluster.c | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index d1602d4bdd..b8836ba009 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -706,30 +706,27 @@ err: static int count_cow_clusters(BDRVQcowState *s, int nb_clusters, uint64_t *l2_table, int l2_index) { - int i = 0; - uint64_t cluster_offset; + int i; - while (i < nb_clusters) { - i += count_contiguous_clusters(nb_clusters - i, s->cluster_size, - &l2_table[l2_index], i, - QCOW_OFLAG_COPIED | QCOW_OFLAG_COMPRESSED); - if ((i >= nb_clusters) || be64_to_cpu(l2_table[l2_index + i])) { - break; - } + for (i = 0; i < nb_clusters; i++) { + uint64_t l2_entry = be64_to_cpu(l2_table[l2_index + i]); + int cluster_type = qcow2_get_cluster_type(l2_entry); - i += count_contiguous_free_clusters(nb_clusters - i, - &l2_table[l2_index + i]); - if (i >= nb_clusters) { + switch(cluster_type) { + case QCOW2_CLUSTER_NORMAL: + if (l2_entry & QCOW_OFLAG_COPIED) { + goto out; + } break; - } - - cluster_offset = be64_to_cpu(l2_table[l2_index + i]); - - if ((cluster_offset & QCOW_OFLAG_COPIED) || - (cluster_offset & QCOW_OFLAG_COMPRESSED)) + case QCOW2_CLUSTER_UNALLOCATED: + case QCOW2_CLUSTER_COMPRESSED: break; + default: + abort(); + } } +out: assert(i <= nb_clusters); return i; } |