Re: [Libguestfs] [PATCH nbdkit v3 1/3] filters: Implement next_ops .reopen call.

> +int > +backend_reopen (struct backend *b, struct connection *conn, int readonly) > +{ > + struct b_conn_handle *h = &conn->handles[b->i]; > + > + debug ("%s: reopen", b->name); > + > + if (h->handle != NULL) > + backend_close (b, conn); > + return backend_open (b, conn, readonly); Do we want to grab a resource lock at this point? Should we be trying hard to prevent further client calls from going to the retry filter while the retry filter is reopening the real plugin? Or do those locks belong in the retry filter itself? If nothing else, we probably want some sort of locking to ensure that two threads are not trying reopen at the same time.