Re: Remount root RO after the root dentry drops from the namespace

[Daniel Drake <dsd@laptop.org>]

On Wed, 2009-11-18 at 13:58 +0100, Miklos Szeredi wrote:
> I see some confusion here, there's no "path/to/realroot", the bind
> mount didn't actually do anything to the namespace, it just made
> "/versions/run/1" (which will later become "/") a mountpoint.

Ah yes, I misunderstood.

This bind-mounting trick actually allows for a simplification to the
whole procedure I listed earlier. Everything is working now.

We previously added support to util-linux-ng's switch_root utility to
execute that procedure for the case when the target root is not a mount
point. I'll submit a patch to revert that and instead note this trick in
the manpage.

Thanks for your help!
Daniel