diff options
| -rw-r--r-- | block/qcow2.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index fc7d4b185e..11903fb547 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -4107,7 +4107,7 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, { int64_t allocation_start, host_offset, guest_offset; int64_t clusters_allocated; - int64_t old_file_size, new_file_size; + int64_t old_file_size, last_cluster, new_file_size; uint64_t nb_new_data_clusters, nb_new_l2_tables; /* With a data file, preallocation means just allocating the metadata @@ -4127,7 +4127,13 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, ret = old_file_size; goto fail; } - old_file_size = ROUND_UP(old_file_size, s->cluster_size); + + last_cluster = qcow2_get_last_cluster(bs, old_file_size); + if (last_cluster >= 0) { + old_file_size = (last_cluster + 1) * s->cluster_size; + } else { + old_file_size = ROUND_UP(old_file_size, s->cluster_size); + } nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, s->cluster_size); |