On 10.07.19 03:05, John Snow wrote:
> The way bitmap backups work is by starting at 75% if it needs
> to copy just 25% of the disk.

Although there is this comment:

> /* TODO job_progress_set_remaining() would make more sense */

So...

> The way sync=top currently works, however, is to start at 0% and then
> never update the progress if it doesn't copy a region. If it needs to
> copy 25% of the disk, we'll finish at 25%.
> 
> Update the progress when we skip regions.

Wouldn’t it be more correct to decrease the job length?

Max

> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  block/backup.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/block/backup.c b/block/backup.c
> index a64b768e24..38c4a688c6 100644
> --- a/block/backup.c
> +++ b/block/backup.c
> @@ -417,6 +417,7 @@ static int coroutine_fn backup_loop(BackupBlockJob *job)
>          if (job->sync_mode == MIRROR_SYNC_MODE_TOP &&
>              bdrv_is_unallocated_range(bs, offset, job->cluster_size))
>          {
> +            job_progress_update(&job->common.job, job->cluster_size);
>              bdrv_reset_dirty_bitmap(job->copy_bitmap, offset,
>                                      job->cluster_size);
>              continue;
>