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=-5.5 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 7B6DAC433E0 for ; Mon, 21 Dec 2020 20:59:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 388F622AAA for ; Mon, 21 Dec 2020 20:59:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725964AbgLUU7m (ORCPT ); Mon, 21 Dec 2020 15:59:42 -0500 Received: from smtp-33.italiaonline.it ([213.209.10.33]:47809 "EHLO libero.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725907AbgLUU7m (ORCPT ); Mon, 21 Dec 2020 15:59:42 -0500 X-Greylist: delayed 380 seconds by postgrey-1.27 at vger.kernel.org; Mon, 21 Dec 2020 15:59:41 EST Received: from venice.bhome ([94.37.172.193]) by smtp-33.iol.local with ESMTPA id rSAZkWSnljQzorSAZkJyd3; Mon, 21 Dec 2020 21:52:39 +0100 x-libjamoibt: 1601 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inwind.it; s=s2014; t=1608583959; bh=Dxx0GlO0p/fLF6+sRMMDEDa/zD9tmuvS88sa+sIo4BQ=; h=From; b=rKFzAv8+Pg6Ih3FI4CMPzUonyRpK2ObVCm+TD4AvFshy0c92g80uq693sVTueWRe5 /SbsJnI/J6LOPReaRH2oa2Uep8VCAIpAPSCzHIFyYBjvE6EuNZ0g8HxqGOkJiBwZQx LoizDP9EXc7kPt+jGquCutozx+9IV5RGVlKjjI3adFwpXeGfSbG8FoW+YWF9eUct/D 9w2Kh5ZR38/3mbTusK9FQQxDybqXEcAKNqJIUpFXEthIHW+Plr+TN3DYqvSYFgThhG VhnJnY2oWIEOaiH1GboRXP7DZUWybkV+BBxtNTqubrid2WjMIYYMXFKvkN6ufFN/Dp 0Ksy2QQmpEqiw== X-CNFS-Analysis: v=2.4 cv=e6rD9Yl/ c=1 sm=1 tr=0 ts=5fe10b17 cx=a_exe a=z1y4hvBwYU35dpVEhKc0WA==:117 a=z1y4hvBwYU35dpVEhKc0WA==:17 a=IkcTkHD0fZMA:10 a=gjiO5ye9uZJco596x2oA:9 a=QEXdDO2ut3YA:10 Reply-To: kreijack@inwind.it Subject: Re: WG: How to properly setup for snapshots To: Remi Gauvin Cc: linux-btrfs References: <20201221223701.0845e9ad@natsu> <108a3254-f120-b5fe-2b7f-f363cbe34158@georgianit.com> From: Goffredo Baroncelli Message-ID: <4058703a-8cbc-3ceb-c9e7-08fcaaa2d8aa@inwind.it> Date: Mon, 21 Dec 2020 21:52:39 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4xfCCy/u0pVrdi0T0HowhePVF9yjhQjfookE0n/Z5MfF5jn96WhgQVs1ahqdnHONI+3qDygBWb+25AjKL2+Ua/rGchZuV2g/wItnhTNKTEOjBpfx5IVVtR 3ZRXjFaTQ6PTeT7EE6SzvlPyrwl4ZYkvalNErBoBbI/JwG7i5xHh/cLLpgUvz/Lv268lEdhgheB7vPUEYHfyANT++SoENqC29e04iMORYK/oy8G4CwnCF3oT Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 12/21/20 9:27 PM, Remi Gauvin wrote: > On 2020-12-21 3:14 p.m., Goffredo Baroncelli wrote: > >> A subvolume can be moved everywhere with a simple 'mv' command. >> > > No, they can not,, try this again with a *read only* snapshot > The topic was about why put the subvolumes/snapshots in another subvolume. A readonly snapshot can't be moved from its parent (doesn't matter if it is a diretory or a subvolume). This is true. But the subvolume containing a readonly snapshot can be moved : $ btrfs sub crea sub1 Create subvolume './sub1' $ btrfs sub crea sub2 Create subvolume './sub2' $ mkdir dir1 $ btrfs sub snap -r sub2 sub1/snap2 Create a readonly snapshot of 'sub2' in 'sub1/snap2' $ btrfs sub snap -r sub2 dir1/snap2 Create a readonly snapshot of 'sub2' in 'dir1/snap2' $ mv sub1 sub1-renamed $ mv dir1 dir1-renamed -- gpg @keyserver.linux.it: Goffredo Baroncelli Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5