Implements the full PVE storage plugin snapshot interface backed by native
ZFS snapshots on TrueNAS, via the v2.0 REST API:
volume_has_feature — advertises snapshot support for raw volumes
volume_snapshot_needs_fsfreeze — returns 1 (request guest IO freeze)
volume_snapshot — POST /zfs/snapshot {dataset, name}
volume_snapshot_delete — DELETE /zfs/snapshot/id/{uri_escaped_id}
volume_snapshot_rollback — POST /zfs/snapshot/rollback {id, options}
volume_rollback_is_possible — enforces ZFS "most recent snap only" rule
volume_snapshot_info — GET /zfs/snapshot?dataset=... → {name: {id, ctime}}
Snapshot ID format: pool/volname@snapname
DELETE path requires full URI encoding (uri_escape) — unlike the dataset
endpoint, the snapshot API does not accept bare slashes in the path segment.
Tested on pve01-hq (PVE 9.2.3) against TrueNAS CORE 13.0-U6:
- create / list / delete: OK
- rollback_is_possible ordering: correctly rejects non-latest snapshots
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
59d8a8100f