From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp01.belwue.de ([129.143.71.86]:40887 "EHLO smtp01.belwue.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965281AbdLRQtn (ORCPT ); Mon, 18 Dec 2017 11:49:43 -0500 Received: from fex.rus.uni-stuttgart.de (fex.rus.uni-stuttgart.de [129.69.1.129]) by smtp01.belwue.de (Postfix) with SMTP id 373968B10 for ; Mon, 18 Dec 2017 17:49:42 +0100 (MET) Date: Mon, 18 Dec 2017 17:49:41 +0100 From: Ulli Horlacher To: linux-btrfs@vger.kernel.org Subject: btrfs subvolume list for not mounted filesystem? Message-ID: <20171218164941.GA22020@rus.uni-stuttgart.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: I want to mount an alternative subvolume of a btrfs filesystem. I can list the subvolumes when the filesystem is mounted, but how do I know them, when the filesystem is not mounted? Is there a query command? root@xerus:~# mount | grep /test /dev/sdd4 on /test type btrfs (rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/) root@xerus:~# btrfs subvolume list /test ID 258 gen 156 top level 5 path tux/zz ID 259 gen 156 top level 5 path tux/z1 ID 260 gen 156 top level 5 path tmp/zz ID 261 gen 19 top level 260 path tmp/zz/z1 ID 269 gen 156 top level 5 path tux/test ID 271 gen 129 top level 269 path tux/test/.snapshot/2017-12-02_1341.test root@xerus:~# umount /test root@xerus:~# btrfs subvolume list /dev/sdd4 ERROR: not a btrfs filesystem: /dev/sdd4 ERROR: can't access '/dev/sdd4' -- 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:<20171218164941.GA22020@rus.uni-stuttgart.de>