Re: [RFC][PATCH] rbind across namespaces

[Miklos Szeredi]

> Enclosed the simplified patch,

Looks much better :)

I still see a problem: what if old_nd.mnt is already detached, and
bind is non-recursive.  Now it fails with EINVAL, though it used to
work (and I think is very useful).

When doing up_write(...) you don't have to keep the order, just check
if the namespaces are not equal for the second up_write().

And why don't you do this:

	if (old_ns < mntpt_ns)
		down_write(&old_ns->sem);

instead of this

	if (old_ns < mntpt_ns) {
		down_write(&old_ns->sem);
	}

Miklos
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