From: Max Reitz <[email protected]> A qcow2 image file's length is not required to have a length that is a multiple of the cluster size. However, qcow2_refcount_area() expects an aligned value for its @start_offset parameter, so we need to round @old_file_size up to the next cluster boundary.
Reported-by: Ping Li <[email protected]> Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1414049 Signed-off-by: Max Reitz <[email protected]> Message-id: [email protected] Cc: [email protected] Reviewed-by: Eric Blake <[email protected]> Reviewed-by: Jeff Cody <[email protected]> Reviewed-by: Stefan Hajnoczi <[email protected]> Signed-off-by: Max Reitz <[email protected]> --- block/qcow2.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/qcow2.c b/block/qcow2.c index d3e114bce5..1ea763126d 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -3188,6 +3188,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, "Failed to inquire current file length"); return old_file_size; } + old_file_size = ROUND_UP(old_file_size, s->cluster_size); nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, s->cluster_size); -- 2.13.6
