Re: Possible to undo subvol delete?

[Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>]

(2014/12/03 0:17), Shriramana Sharma wrote:
> On Tue, Dec 2, 2014 at 12:41 PM, Satoru Takeuchi
> <takeuchi_satoru@jp.fujitsu.com> wrote:
>>
>> Snapper can automatically take a snapshot just before
>> taking/deleting snapshots. So, if you delete a snapshot
>> by mistake, it's still alive.
>
> Sorta contradicts the whole point of deleting a snapshot, no? Or is it
> some sort of trash vs (real) delete mechanism?
>

It's not a Btrfs itself's feature. It's a snapper's feature.
It works as a helper of snapshot management.

1. You takes /snap by "snapper create" command.
2. You delete /snap by "snapper delete" command by mistake.
    Then snapper takes a "pre" snapshot just before deleting
    /snap.
3. Now /snap is deleted, however, a "pre" snapshot which is
    the same as /snap before deleting, is still alive.

I don't know how Btrfs itself undo the deletion of a snapshot.
It works if you manages snapshots not by btrfs directly,
but by snapper.

If I misunderstanding something, sorry for noise.

Thanks,
Satoru