From: Sander Eikelenboom Subject: can't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd Date: Thu, 5 Jan 2012 11:37:59 +0100 Message-ID: <217150909.20120105113759@eikelenboom.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org To: "Theodore Ts'o" Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org I'm having some troubles with a ext4 filesystem on LVM, it seems bricked and fsck doesn't seem to find and correct the problem. Steps: 1) fsck -v -p -f the filesystem 2) mount the filesystem 3) Try to copy a file 4) filesystem will be mounted RO on error (see below) 5) fsck again, journal will be recovered, no other errors 6) start at 1) I think the way i bricked it is: - make a lvm snapshot from that lvm logical disk - mount that lvm snapshot as RO - try to copy a file from that mounted RO snapshot to a diffrent dir on the lvm logical disk the snapshot is from. - it fails and i can't recover (see above) Is there a way to recover from this ? [ 220.748928] EXT4-fs error (device dm-2): ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd [ 220.749415] Aborting journal on device dm-2-8. [ 220.771633] EXT4-fs error (device dm-2): ext4_journal_start_sb:327: Detected aborted journal [ 220.772593] EXT4-fs (dm-2): Remounting filesystem read-only [ 220.792455] EXT4-fs (dm-2): Remounting filesystem read-only [ 220.805118] EXT4-fs (dm-2): ext4_da_writepages: jbd2_start: 9680 pages, ino 4079617; err -30 serveerstertje:/mnt/xen_images/domains/production# cd / serveerstertje:/# umount /mnt/xen_images/ serveerstertje:/# fsck -f -v -p /dev/serveerstertje/xen_images fsck from util-linux-ng 2.17.2 /dev/mapper/serveerstertje-xen_images: recovering journal 277 inodes used (0.00%) 5 non-contiguous files (1.8%) 0 non-contiguous directories (0.0%) # of inodes with ind/dind/tind blocks: 41/41/3 Extent depth histogram: 69/28/2 51890920 blocks used (79.18%) 0 bad blocks 41 large files 199 regular files 53 directories 0 character device files 0 block device files 0 fifos 0 links 16 symbolic links (16 fast symbolic links) 0 sockets -------- 268 files serveerstertje:/# System: - Kernel 3.2.0 - Debian Squeeze with: ii e2fslibs 1.41.12-4stable1 ext2/ext3/ext4 file system libraries ii e2fsprogs 1.41.12-4stable1 ext2/ext3/ext4 file system utilities