Re: Recursive subvolume snapshots and deletion?

[Chris Mason <clm@fb.com>]

On Mon, Mar 23, 2015 at 12:57 AM, Lennart Poettering 
<mzerqung@0pointer.de> wrote:
> Heya!
> 
> So what's the story on recursive btrfs snapshotting and snapshot
> removal? Since a while systemd has now by default creating btrfs
> subvolumes for /var/lib/machines for example. Now, if that code is run
> inside a container, and the container itself already is stored in a
> subvolume we end up with a subvolume inside a subvolume, which
> currently breaks snapshotting and deletion of the outer container
> subvolume.
> 
> What's the plan regarding recursive versions of the operations? Any
> plan to add this? We could work around this in userspace, of course,
> but it would not be atomic, and I'd much prefer if the kernel could do
> this on its own!

Hi Lennart,

I've got a patch to btrfs-progs that can do the recursive snapshotting, 
let me clean it up and submit to Dave.  For recursive deletion I think 
the same method can be used.

-chris