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Subjectpivot_root broken in 2.6.15-rc1-mm2

Pivot_root seems to be broken in 2.6.15-rc1-mm2.

I havea initramfs filesystem, mount a ext3 filesystem (which has /mnt)
at '/root' and

cd /root
pivot . mnt

and it says -EINVAL.

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?

Could this be related to the new shared mounts stuff???

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