[pbs-devel] [RFC proxmox-backup] fix #5710: api: backup: stat known chunks during backup

[Gabriel Goller]

On 13.09.2024 15:59, Christian Ebner wrote:
>In order to reduce the impact, stat the list of known chunks twice
>during backup:
>- during registration of a known chunk
>- when finishing the backup
>
>The first stat is to early on detect missing chunks, the latter
>assures that all (known and newly registered) chunks are present on
>the datastore after the backup run.
>
>If a missing chunk is detected, the backup run itself will fail and
>the previous backup snapshots verify state is set to failed.
>This prevents the same snapshot from being reused by another,
>subsequent backup job.

I wonder if we need the first option. We could only `stat` the chunks at
the end of the backup to improve performance.