From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexei Starovoitov Subject: Re: [PATCH net-next 3/4] bpf: add support for persistent maps/progs Date: Fri, 16 Oct 2015 19:43:08 -0700 Message-ID: <5621B5BC.8020204@plumgrid.com> References: <1445016105.1251655.412231129.6574D430@webmail.messagingengine.com> <5621371C.2000507@plumgrid.com> <56213A61.40509@iogearbox.net> <87d1welkp8.fsf@x220.int.ebiederm.org> <56214FAC.5060704@plumgrid.com> <87y4f2io9l.fsf@x220.int.ebiederm.org> <5621649A.80403@plumgrid.com> <87mvviidku.fsf@x220.int.ebiederm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: Daniel Borkmann , Hannes Frederic Sowa , davem@davemloft.net, viro@ZenIV.linux.org.uk, tgraf@suug.ch, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alexei Starovoitov To: "Eric W. Biederman" Return-path: Received: from mail-pa0-f46.google.com ([209.85.220.46]:35310 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752040AbbJQCnK (ORCPT ); Fri, 16 Oct 2015 22:43:10 -0400 Received: by payp3 with SMTP id p3so5345464pay.2 for ; Fri, 16 Oct 2015 19:43:10 -0700 (PDT) In-Reply-To: <87mvviidku.fsf@x220.int.ebiederm.org> Sender: netdev-owner@vger.kernel.org List-ID: On 10/16/15 4:44 PM, Eric W. Biederman wrote: > Alexei Starovoitov writes: > >> We can argue about api for 2nd, whether it's mount with fd=1234 string >> or else, but for the first mount style doesn't make sense. > > Why does mount not make sense? It is exactly what you are looking for > so why does it not make sense? hmm, how do you get a new fd back after mounting it? Note, open cannot be overloaded, so we end up with BPF_NEW_FD anyway, but now it's more convoluted and empty mounts are everywhere.