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SubjectRe: [PATCH v8 07/11] proc: flush task dcache entries from all procfs instances
On Wed, Feb 12, 2020 at 08:38:33PM +0000, Al Viro wrote:
> On Wed, Feb 12, 2020 at 12:35:04PM -0800, Linus Torvalds wrote:
> > On Wed, Feb 12, 2020 at 12:03 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
> > >
> > > What's to prevent racing with fs shutdown while you are doing the second part?
> >
> > I was thinking that only the proc_flush_task() code would do this.
> >
> > And that holds a ref to the vfsmount through upid->ns.
> >
> > So I wasn't suggesting doing this in general - just splitting up the
> > implementation of d_invalidate() so that proc_flush_task_mnt() could
> > delay the complex part to after having traversed the RCU-protected
> > list.
> >
> > But hey - I missed this part of the problem originally, so maybe I'm
> > just missing something else this time. Wouldn't be the first time.
>
> Wait, I thought the whole point of that had been to allow multiple
> procfs instances for the same userns? Confused...

s/userns/pidns/, sorry

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