Re: Setting mount propagation type in new mount API

[Christian Brauner]

On Mon, May 18, 2020 at 03:30:34PM +0100, David Howells wrote:
> Michael Kerrisk (man-pages) <mtk.manpages@xxxxxxxxx> wrote:
> 
> > I've been looking at the new mount API (fsopen(), fsconfig(),
> > fsmount(), move_mount(), etc.) and among the details that remain
> > mysterious to me is this: how does one set the propagation type
> > (private/shared/slave/unbindable) of a new mount and change the
> > propagation type of an existing mount?
> 
> Christian said he was going to have a go at writing mount_setattr().  It's not
> trivial as it has to be able to handle AT_RECURSIVE.

Right, I've put this on my roadmap now. It's becoming more urgent for us
too since I've already switched over a few bits to the new mount api to
make use of detached/anonymous mounts.
I've planned to start working on a version early next week.

Christian