From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66B2BC433E0 for ; Wed, 10 Mar 2021 07:55:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E6FB64E87 for ; Wed, 10 Mar 2021 07:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230269AbhCJHzC (ORCPT ); Wed, 10 Mar 2021 02:55:02 -0500 Received: from smtp01.belwue.de ([129.143.71.86]:64475 "EHLO smtp01.belwue.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229900AbhCJHzC (ORCPT ); Wed, 10 Mar 2021 02:55:02 -0500 X-Greylist: delayed 516 seconds by postgrey-1.27 at vger.kernel.org; Wed, 10 Mar 2021 02:55:02 EST Received: from fex.rus.uni-stuttgart.de (fex.rus.uni-stuttgart.de [129.69.1.129]) by smtp01.belwue.de (Postfix) with SMTP id ADB4AC6D2 for ; Wed, 10 Mar 2021 08:46:20 +0100 (MET) Date: Wed, 10 Mar 2021 08:46:20 +0100 From: Ulli Horlacher To: linux-btrfs@vger.kernel.org Subject: nfs subvolume access? Message-ID: <20210310074620.GA2158@tik.uni-stuttgart.de> Mail-Followup-To: linux-btrfs@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org When I try to access a btrfs filesystem via nfs, I get the error: root@tsmsrvi:~# mount tsmsrvj:/data/fex /nfs/tsmsrvj/fex root@tsmsrvi:~# time find /nfs/tsmsrvj/fex | wc -l find: File system loop detected; '/nfs/tsmsrvj/fex/spool' is part of the same file system loop as '/nfs/tsmsrvj/fex'. 1 root@tsmsrvi:~# On tsmsrvj I have in /etc/exports: /data/fex tsmsrvi(rw,async,no_subtree_check,no_root_squash) This is a btrfs subvolume with snapshots: root@tsmsrvj:~# btrfs subvolume list /data ID 257 gen 35 top level 5 path fex ID 270 gen 36 top level 257 path fex/spool ID 271 gen 21 top level 270 path fex/spool/.snapshot/2021-03-07_1453.test ID 272 gen 23 top level 270 path fex/spool/.snapshot/2021-03-07_1531.test ID 273 gen 25 top level 270 path fex/spool/.snapshot/2021-03-07_1532.test ID 274 gen 27 top level 270 path fex/spool/.snapshot/2021-03-07_1718.test root@tsmsrvj:~# find /data/fex | wc -l 489887 root@tsmsrvj:~# What must I add to /etc/exports to enable subvolume access for the nfs client? tsmsrvi and tsmsrvj (nfs client and server) both run Ubuntu 20.04 with btrfs-progs v5.4.1 -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher@tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20210310074620.GA2158@tik.uni-stuttgart.de>