Date:   Fri, 15 Mar 2019 20:57:08 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     listac@...elschwaden.de
Cc:     linux-ext4@...r.kernel.org
Subject: Re: e2fsck fails on non journalled partition

It looks like you have some superblock corruption, since the journal UUID is non-zero, and the journal inode is also non-zero. You can probably use debugfs "ssv" command to clear these fields so that e2fsck doesn't think there is a journal somewhere. 

Cheers, Andreas

> On Mar 15, 2019, at 13:28, Ede Wolf <listac@...elschwaden.de> wrote:
> 
> I have to check an ext4 partition, that has been created without a journal. But, as it seems, e2fsck is refusing to check this drive, failing with a "no external journal has been found" error, code 12. That of course is correct, no journal does imply no external journal.
> 
> I am wondering, ^has_journal is well documented in both the mkfs.ext4 manpage as well as tune2fs. So by omitting the journal nothing obscure, hacky or obviously unsupported has been done.
> 
> Why is e2fsck refusing to check the partition? Or what else may I have be doing wrong?
> 
> 
> ~ # e2fsck -fv /dev/sde1
> e2fsck 1.44.5 (15-Dec-2018)
> Can't find external journal
> 
> USERDATA: ********** WARNING: Filesystem still has errors **********
> 
> ~ # echo $?
> 12
> ~ #
> 
> Filesystem has been created similar to this:
> 
> mkfs -m 0 -O "^has_journal,dir_index,^metadata_csum,64bit,^ext_attr,^huge_file,large_dir,^metadata_csum_seed,^quota,extent" -b 4096 -i 32768 -L USERDATA
> 
> 
> 
> ~ # tune2fs -l /dev/sde1
> tune2fs 1.44.5 (15-Dec-2018)
> Filesystem volume name:   USERDATA
> Last mounted on:          /mnt/userdata
> Filesystem UUID:          241d6272-a004-44ef-9998-7fbc3ef98672
> Filesystem magic number:  0xEF53
> Filesystem revision #:    1 (dynamic)
> Filesystem features:      ext_attr resize_inode dir_index filetype extent 64bit large_dir sparse_super large_file
> Filesystem flags:         signed_directory_hash
> Default mount options:    user_xattr acl
> Filesystem state:         not clean with errors
> Errors behavior:          Continue
> Filesystem OS type:       Linux
> Inode count:              4669440
> Block count:              9338880
> Reserved block count:     0
> Overhead blocks:          1536
> Free blocks:              5602781
> Free inodes:              4247845
> First block:              0
> Block size:               4096
> Fragment size:            4096
> Group descriptor size:    64
> Reserved GDT blocks:      1024
> Blocks per group:         32768
> Fragments per group:      32768
> Inodes per group:         16384
> Inode blocks per group:   1024
> Filesystem created:       Wed Jan 30 18:42:35 2019
> Last mount time:          Fri Mar 15 20:16:26 2019
> Last write time:          Fri Mar 15 20:16:26 2019
> Mount count:              90
> Maximum mount count:      -1
> Last checked:             Thu Jan 31 18:49:12 2019
> Check interval:           0 (<none>)
> Lifetime writes:          204 GB
> Reserved blocks uid:      0 (user root)
> Reserved blocks gid:      0 (group root)
> First inode:              11
> Inode size:              256
> Required extra isize:     32
> Desired extra isize:      32
> Journal UUID:             00000000-1b00-0000-0000-000000000000
> Journal inode:            131072
> Default directory hash:   half_md4
> Directory Hash Seed:      2416ec00-bef9-437a-a3b1-f626303d72a2
> FS Error count:           41
> First error time:         Sun Mar  3 13:15:39 2019
> First error function:     ext4_readdir
> First error line #:       182
> First error inode #:      3673403
> First error block #:      0
> Last error time:          Mon Mar 11 18:22:09 2019
> Last error function:      ext4_empty_dir
> Last error line #:        2712
> Last error inode #:       639817
> Last error block #:       1
> 

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