Re: pivot_root broken in 2.6.15-rc1-mm2

From: Johannes Stezenbach
Date: Tue Nov 22 2005 - 21:42:01 EST

On Wed, Nov 23, 2005 at 02:15:45AM +0000, Al Viro wrote:
> On Wed, Nov 23, 2005 at 01:07:28PM +1100, Neil Brown wrote:
> > After putting in copious tracing printk, the offending test is:
> >
> > if (user_nd.mnt->mnt_parent == user_nd.mnt)
> > goto out2; /* not attached */
> >
> > If I remove this, it works (or seems to).
> > Presumably the initial root file system is 'not attached'. But that
> > shouldn't be a problem, should it?
> Initial root is root and will remain root, period.
> > Could this be related to the new shared mounts stuff???
> No. And no, it's not going to change - any memory you win on killing
> initramfs is not going to be worth the extra code needed to special-case
> it.
> pivot_root() does work in chroot jail (including the one we get after
> chrooting to "final" root), but that's all it does.

Just want to add that some nice person wrote

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