> 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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