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 89C8AC388F7 for ; Sat, 7 Nov 2020 15:44:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B125206D5 for ; Sat, 7 Nov 2020 15:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726092AbgKGPoG (ORCPT ); Sat, 7 Nov 2020 10:44:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726043AbgKGPoF (ORCPT ); Sat, 7 Nov 2020 10:44:05 -0500 Received: from savella.carfax.org.uk (2001-ba8-1f1-f0e6-0-0-0-2.autov6rev.bitfolk.space [IPv6:2001:ba8:1f1:f0e6::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D97AC0613CF for ; Sat, 7 Nov 2020 07:44:05 -0800 (PST) Received: from hrm by savella.carfax.org.uk with local (Exim 4.92) (envelope-from ) id 1kbQO1-0007eY-Kl; Sat, 07 Nov 2020 15:44:17 +0000 Date: Sat, 7 Nov 2020 15:44:17 +0000 From: Hugo Mills To: Pete Cc: linux-btrfs@vger.kernel.org Subject: Re: Move from 5.9.3 kernel to 5.4.75? Message-ID: <20201107154417.GP30996@savella.carfax.org.uk> Mail-Followup-To: Hugo Mills , Pete , linux-btrfs@vger.kernel.org References: <7d436bf1-80d2-a298-d124-e9385fb6ef42@petezilla.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7d436bf1-80d2-a298-d124-e9385fb6ef42@petezilla.co.uk> X-GPG-Fingerprint: DD84 D558 9D81 DDEE 930D 2054 585E 1475 E2AB 1DE4 X-GPG-Key: E2AB1DE4 X-Parrot: It is no more. It has joined the choir invisible. X-IRC-Nicks: darksatanic darkersatanic darkling darkthing User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Sat, Nov 07, 2020 at 03:12:59PM +0000, Pete wrote: > Is there an impact for btrfs for moving from a 5.9.3 kernel to 5.4.75 > kernel? I'm using raid1 or single (more than one file system), no 1c2 > or 1c3 etc, space_cache_v2 and zstd compression. The reason is that I'm > trying to see if this fixes another problem - but breaking my file > system is a major concern. If it's going to fail, it'll fail safely. If there are features used on the FS that the earlier kernel can't deal with, it'll spot that there's incompat bits set and refuse to mount. You'll get back all the kernel bugs that didn't have fixes backported, but that's all. Hugo. -- Hugo Mills | "There's a Martian war machine outside -- they want hugo@... carfax.org.uk | to talk to you about a cure for the common cold." http://carfax.org.uk/ | PGP: E2AB1DE4 | Stephen Franklin, Babylon 5