Re: [PATCH v12 10/12] namei: aggressively check for nd->root escape on ".." resolution

Linus Torvalds [off-list ref] wrote:

quoted

Hinting to userspace to do a retry (with -EAGAIN as you mention in your
other mail) wouldn't be a bad thing at all, though you'd almost
certainly get quite a few spurious -EAGAINs -- &{mount,rename}_lock are
global for the entire machine, after all.

I'd hope that we have some future (possibly very long-term)
alternative that is not quite system-global, but yes, right now they
are.

It ought to be reasonably easy to make them per-sb at least, I think.  We
don't allow cross-super rename, right?

David