Re: find snapshot parent?

[Ulli Horlacher <framstag@rus.uni-stuttgart.de>]

On Sat 2019-07-06 (19:57), Nikolay Borisov wrote:

> > And how can I see whether /test/tmp/xx/ss1 is a snapshot at all?
> > Do all snapshots have a "Parent UUID" and regular subvolumes not?
> 
> Indeed, only snapshots have a Parent UUID.

Not all:

root@xerus:/test# btrfs subvolume snapshot -r /test /test/ss1
Create a readonly snapshot of '/test' in '/test/ss1'

root@xerus:/test# btrfs subvolume show /test/ss1
/test/ss1
        Name:                   ss1
        UUID:                   02bd07bc-0bab-3442-96be-40790e1ba9be
        Parent UUID:            -
        Received UUID:          -
        Creation time:          2019-07-06 22:37:37 +0200
        Subvolume ID:           1036
        Generation:             9824
        Gen at creation:        9824
        Parent ID:              5
        Top level ID:           5
        Flags:                  readonly
        Snapshot(s):

root@xerus:/test# btrfs subvolume show /test
/test is toplevel subvolume

-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher@tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<1e70c50e-54d7-0507-60ad-9c486e3517a9@suse.com>