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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 E2D38C43387 for ; Thu, 20 Dec 2018 22:23:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 853D4218FD for ; Thu, 20 Dec 2018 22:23:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=petezilla.co.uk header.i=@petezilla.co.uk header.b="XMnAvFZS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390139AbeLTWXF (ORCPT ); Thu, 20 Dec 2018 17:23:05 -0500 Received: from phi.wiserhosting.co.uk ([77.245.66.218]:45994 "EHLO phi.wiserhosting.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725781AbeLTWXE (ORCPT ); Thu, 20 Dec 2018 17:23:04 -0500 X-Greylist: delayed 3825 seconds by postgrey-1.27 at vger.kernel.org; Thu, 20 Dec 2018 17:23:04 EST DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=petezilla.co.uk; s=default; h=Content-Transfer-Encoding:Content-Type: MIME-Version:Date:Message-ID:Subject:From:To:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=AUn23gnI+BoMaRKZueK8QvM5r4sthmoXjsElmAKD21g=; b=XMnAvFZS0f5JqcLSqgOlFffQxV MMtz5JZkcmBmnHER3cVuk9m+lu8t04Iq+lcYsaab6Z+A/2zh2JZuOZlE/ZnTUcqYGG9T2l7TZmaL8 +PWhdehbE3VBkDEJp/9Yp84ryJW0CYv0n4/r2kBKUl34A5+6myHf4NmXGppQZAoiThHmTSmqcwlNQ pr3mEbEkySrnAk9cJrSOTjowHcXQe303PioPm6mZjhFJ0f86LfP8+TrkleqUebiNu4POzpvjI/2cU 0YVkT/l7Fstb0etyYX6uDMyk0cfQV/dB1WJPHBpIPRVDoBgjPuxcof5YtYLKgqb3rMPZhRG0LejPC Gz9gOuNA==; Received: from cpc75874-ando7-2-0-cust841.15-1.cable.virginm.net ([86.12.75.74]:51894 helo=[172.16.100.105]) by phi.wiserhosting.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.91) (envelope-from ) id 1ga5iv-004urq-Et; Thu, 20 Dec 2018 21:19:17 +0000 To: linux-btrfs@vger.kernel.org From: Peter Chant Subject: Mount issue, mount /dev/sdc2: can't read superblock Message-ID: <1aa82e28-3331-bc64-071c-6cf87b08ad94@petezilla.co.uk> Date: Thu, 20 Dec 2018 21:21:27 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit X-OutGoing-Spam-Status: No, score=-0.1 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - phi.wiserhosting.co.uk X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - petezilla.co.uk X-Get-Message-Sender-Via: phi.wiserhosting.co.uk: authenticated_id: pete@petezilla.co.uk X-Authenticated-Sender: phi.wiserhosting.co.uk: pete@petezilla.co.uk Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org I managed to break my root partition today. Playing with GPU passthrough to a second graphics card, unsuccessfully, I suspect lead to some lockups and/or unclean mounts. I've Googled a bit and tried a number of things stopping just before 'btrfs check --repair'. I'm running kernel 4.19.10. I now have the latest version of btrfs-progs, but I do admit to 'having a go' with btrfs-progs 4.4.something from a Mint installation. I've tried btrfs-find-root - and got the following: btrfs-find-root /dev/sdc2 Superblock thinks the generation is 793794 Superblock thinks the level is 1 Found tree root at 1113905790976 gen 7937947 level 1 (transcribed by reading off PC and typing into laptop, any errors are mine) Not sure what to do with the above info. Should I just reformat and re-install (inc backups) or is there something worth trying? Pete