diff options
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index fd506b4cb3..996b3314f4 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -2166,6 +2166,9 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table, int ret; int i, j; + /* qcow2_downgrade() is not allowed in images with subclusters */ + assert(!has_subclusters(s)); + slice_size2 = s->l2_slice_size * l2_entry_size(s); n_slices = s->cluster_size / slice_size2; @@ -2233,8 +2236,11 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table, if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) { if (!bs->backing) { - /* not backed; therefore we can simply deallocate the - * cluster */ + /* + * not backed; therefore we can simply deallocate the + * cluster. No need to call set_l2_bitmap(), this + * function doesn't support images with subclusters. + */ set_l2_entry(s, l2_slice, j, 0); l2_dirty = true; continue; @@ -2305,6 +2311,10 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table, } else { set_l2_entry(s, l2_slice, j, offset); } + /* + * No need to call set_l2_bitmap() after set_l2_entry() because + * this function doesn't support images with subclusters. + */ l2_dirty = true; } |