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 31917C433E0 for ; Mon, 21 Dec 2020 20:15:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1F8D22AAA for ; Mon, 21 Dec 2020 20:15:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725811AbgLUUPA (ORCPT ); Mon, 21 Dec 2020 15:15:00 -0500 Received: from smtp-33.italiaonline.it ([213.209.10.33]:50761 "EHLO libero.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725780AbgLUUO7 (ORCPT ); Mon, 21 Dec 2020 15:14:59 -0500 Received: from venice.bhome ([94.37.172.193]) by smtp-33.iol.local with ESMTPA id rRZQkW6f0jQzorRZRkJpVZ; Mon, 21 Dec 2020 21:14:17 +0100 x-libjamoibt: 1601 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=libero.it; s=s2014; t=1608581657; bh=sinK7+nqS+0EapypsS1MBUW+U6aMecHsaruYEZSOjzw=; h=From; b=hc757YB70B3IaLZawGXdhp+uuKhzuwLgbC82ImXHZ+5IYvoH5rSZqt+bLViO4BZcL +VkJXufywZg8q65eMO4hc0CirkbnxpKYZOfDyqQfG1+MztuBNe6mN3L4Z8BhJy9SRo 6nDudL5S6F4FVzmN3JK9unBqhEFCys6qr69ubDK+jwVZ20cJTjvf7VrQ5SdcQyq1r6 UzaGP3Ar9JMB0lFR3eprh4imVFwcQt0T06k5NeSMeCyZ++9PtuPGzmsQKt0z3uxI4N Du5VtjCyv53vgHeoCK+9XSmq3kW7QVZs5HdSDdclA2yqrNdOfYTj4xgYlfRiA1apZg YuzKf/AYxgPgQ== X-CNFS-Analysis: v=2.4 cv=e6rD9Yl/ c=1 sm=1 tr=0 ts=5fe10219 cx=a_exe a=z1y4hvBwYU35dpVEhKc0WA==:117 a=z1y4hvBwYU35dpVEhKc0WA==:17 a=IkcTkHD0fZMA:10 a=y1Y41J7T-ZRrHnSpRBcA:9 a=QEXdDO2ut3YA:10 Reply-To: kreijack@inwind.it Subject: Re: WG: How to properly setup for snapshots To: Remi Gauvin , Roman Mamedov Cc: linux-btrfs References: <20201221223701.0845e9ad@natsu> <108a3254-f120-b5fe-2b7f-f363cbe34158@georgianit.com> From: Goffredo Baroncelli Message-ID: Date: Mon, 21 Dec 2020 21:14:16 +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: <108a3254-f120-b5fe-2b7f-f363cbe34158@georgianit.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4xfMaYkFiUldUf3cJj1CrNaLBtMa/khFsTRL0hxjZGJa8vhEROhEO/Y3C6BfR1/PQuEm0n9DQZtUhucRQXe2bWfSJc4JINAhGlQ7W5nvZvf3bMHfihqdh4 b8yMITKm9PseKG9i7NnvNER47ebAuMd6Od+M0pb1SWPYhue34EHotbRrCW/rvn1WfxD164E/mzOu4ImXfFHiYXGluu7P7xNPNhjmZGHig6q5iTxyLjVl+Drt 6nMOpaqoE7Y/6hV2HnOjWA== Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 12/21/20 7:14 PM, Remi Gauvin wrote: > On 2020-12-21 12:37 p.m., Roman Mamedov wrote: > >> >> As such there's no benefit in storing snapshots "inside" a subvolume. There's >> not much of the "inside". Might as well just create a regular directory for >> that -- and with less potential for confusion. > > Maybe I was complicating things for a baby step primer,, but there *are* > very good benefits to putting snapshots in a subvolume. That subvolume > can be moved into other subvolumes, A directory that contains ro > snapshots can not. A subvolume can be moved everywhere with a simple 'mv' command. $ btrfs sub crea sub1 Create subvolume './sub1' $ btrfs sub crea sub2 Create subvolume './sub2' $ btrfs sub crea sub1/sub11 Create subvolume 'sub1/sub11' $ btrfs sub crea sub1/sub12 Create subvolume 'sub1/sub12' $ mv sub1 sub2/ $ find sub2/ sub2/ sub2/sub1 sub2/sub1/sub12 sub2/sub1/sub11 > > This will not matter if your only subvolume is the filesystem root, but > if things were later be subdivided into other subvolumes, it will make > things much quicker and easier to be able to move the .my_snapshots > subvolume. > > -- gpg @keyserver.linux.it: Goffredo Baroncelli Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5