Wolfgang Link 1597f1f9ad Storage: add method volume_rollback_is_possible ...

add method volume_rollback_is_possible and redactor
Improve error handling
If snapshot is not reversible catch it before vm will lock and shutdown.
This is the case if zfs has an younger snapshot.

Signed-off-by: Wolfgang Link <w.link@proxmox.com>

2015-02-12 09:15:02 +01:00

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