From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f170.google.com ([209.85.216.170]:51732 "EHLO mail-qt0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751280AbdJENik (ORCPT ); Thu, 5 Oct 2017 09:38:40 -0400 Received: by mail-qt0-f170.google.com with SMTP id q4so25355639qtq.8 for ; Thu, 05 Oct 2017 06:38:40 -0700 (PDT) MIME-Version: 1.0 From: Eric Wolf <19wolf@gmail.com> Date: Thu, 5 Oct 2017 09:38:18 -0400 Message-ID: Subject: Mounting bad btrfs img file To: linux-btrfs@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-btrfs-owner@vger.kernel.org List-ID: My OS drive had issues with metadata (disk full even though it wasn't etc), and so I reinstalled my OS and now I'm learning that my backup img is bad. What steps should I go through to fix it? $ sudo mount -o offset=8999927808,loop,recovery,ro,nospace_cache,nospace_cache /data/Backup/Nephele.img /mnt mount: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. nephele@Nephele:/data/Backup$ dmesg | tail [48539.443711] BTRFS error (device loop0): parent transid verify failed on 98021605376 wanted 85976 found 85978 [48539.473837] BTRFS error (device loop0): parent transid verify failed on 98021605376 wanted 85976 found 85978 [48539.485032] BTRFS: failed to read tree root on loop0 [48539.494782] BTRFS error (device loop0): parent transid verify failed on 98049490944 wanted 85975 found 85981 [48539.510541] BTRFS error (device loop0): parent transid verify failed on 98049490944 wanted 85975 found 85981 [48539.523464] BTRFS: failed to read tree root on loop0 [48539.526374] BTRFS error (device loop0): parent transid verify failed on 98020917248 wanted 85974 found 85979 [48539.545628] BTRFS error (device loop0): parent transid verify failed on 98020917248 wanted 85974 found 85979 [48539.560595] BTRFS: failed to read tree root on loop0 [48539.589038] BTRFS: open_ctree failed