Re: delete recursivly subvolumes?

[Hugo Mills <hugo@carfax.org.uk>]

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On Fri, Jul 05, 2019 at 09:56:39PM +0200, Ulli Horlacher wrote:
> On Fri 2019-07-05 (19:51), Hugo Mills wrote:
> 
> > > Is there a command/script/whatever to snapshot (copy) a subvolume which
> > > contains (somewhere) other subvolumes?
> > > 
> > > Example:
> > > 
> > > root@xerus:/test# btrfs_subvolume_list /test/ | grep /tmp
> > > /test/tmp
> > > /test/tmp/xx/ss1
> > > /test/tmp/xx/ss2
> > > /test/tmp/xx/ss3
> > > 
> > > I want to have (with one command):
> > > 
> > > /test/tmp --> /test/tmp2
> > > /test/tmp/xx/ss1 --> /test/tmp2/xx/ss1
> > > /test/tmp/xx/ss2 --> /test/tmp2/xx/ss2
> > > /test/tmp/xx/ss3 --> /test/tmp2/xx/ss3
> > 
> >    Remember that this isn't quite so useful, because you can't make
> > read-only snapshots in that structure.
> 
> ss1 ss2 and ss3 are indeed read-only snapshots!
> Of course they do not contain other subvolumes.

   What I'm saying is that you can't make a RO snapshot of test/tmp to
test/tmp2 and have your RO snapshots of ss1-3 in place within it.

   (OK, you could make the snapshot RW initially, snapshot the others
into place and then force it RO, but then you've just broken
send/receive on tmp2).

> >    Generally, I'd recommend not having nested subvols at all, but to
> > put every subvol independently, and mount them into the places you
> > want them to be. That avoids a lot of the issues of nested subvols,
> > such as the ones you're trying to deal with here.
> 
> *I* do it this way from the very beginning :-)
> But I have *users* with *strange* ideas :-}
> 
> I need to handle their data.

   That makes it more awkward. :(

   Hugo.

-- 
Hugo Mills             | "You know, the British have always been nice to mad
hugo@... carfax.org.uk | people."
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                         Laura Jesson, Brief Encounter

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