Re: stat() vs ERROR_DELETE_PENDING, round N + 1

On Thu, Sep 2, 2021 at 10:31 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thomas Munro <thomas.munro@gmail.com> writes:
> > A disruptive solution that works in my tests: we could reuse the
> > global barrier proposed in CF #2962.  If you see EACCES, ask every
> > backend to close all vfds at their next CFI() and wait for them all to
> > finish, and then retry.  If you get EACCES again it really means
> > EACCES, but you'll very probably get ENOENT.
>
> That seems quite horrid :-(.  But if it works, doesn't that mean that
> somewhere we are opening a problematic file without the correct
> sharing flags?

I'm no expert, but not AFAICS.  We managed to delete the file while
some other backend had it open, which FILE_SHARE_DELETE allowed.  We
just can't open it or create a new file with the same name until it's
really gone (all handles closed).