linux-ext4 - Re: ext4_ext_check_inode: bad header/extent in inode

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Date:	Fri, 24 Apr 2009 07:42:01 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Theodore Tso <tytso@....edu>
CC:	Christian Kujau <christian@...dbynature.de>,
	linux-ext4@...r.kernel.org
Subject: Re: ext4_ext_check_inode: bad header/extent in inode

Eric Sandeen wrote:
> Theodore Tso wrote:
>> On Fri, Apr 24, 2009 at 02:40:58AM -0700, Christian Kujau wrote:
>>> Maybe the repair with 1.41.{3,4} before did something wrong and I should 
>>> use 1.41.5 from the beginning? This issue is somewhat reproducible (given 
>>> the fs holds enough files), so I could start over, corrupt the fs again 
>>> and let e2fsprogs-1.41.5 do the whole job.
>> I doubt it; the problem was that the repair performed by e2fsck 1.41.3
>> was simply imcomplete.  You can try to reproduce the corrupted
>> filesystem again, but it should result in the same result.
>>
>> Note that because there was garbage written into the inode table,
>> there was going to be data loss; there's not much that can be done
>> about that.  This just simple does a better job cleaning up after the
>> mess, that's all.
>>
>> 						- Ted
>>
> 
> But it's still got errors:
> 
> it fixed up inodes 12042, 12207, 12249 in lost+found plus "12090
> (/t/#12090)" (?)
> 
> but post-mount:
> 
> sid:~# mount -t ext4 /dev/md0 /mnt/md0
> sid:~# ls -la /mnt/md0/lost*
> ls: cannot access /mnt/md0/lost+found/#12042: Input/output error
> ls: cannot access /mnt/md0/lost+found/#12207: Input/output error
> ls: cannot access /mnt/md0/lost+found/#12249: Input/output error
> total 20
> c????????? ? ?    ?        ?            ? #12042
> s????????? ? ?    ?        ?            ? #12207
> s????????? ? ?    ?        ?            ? #12249
> drwx------ 2 root root 16384 Apr 23 21:16 .
> drwxr-xr-x 5 root root  4096 Apr 23 21:15 ..
> 
> Christian, is there anything in dmesg along with it this time?

For what it's worth, it seems to repair it ok for me, or at least I'm
not getting your errors:

[root@...de test]# mount -o loop md0_e2i mnt/
[root@...de test]# ls -la mnt/lost*
total 20
drwx------. 2 root       root       16384 2009-04-23 14:16 .
drwxr-xr-x. 5 root       root        4096 2009-04-23 14:15 ..
c--S--s-w-. 1 4232184840 4232201271  8, 0 1970-01-13 00:41 #12042
sr-xrwSr--. 1 4229628009 4228087921     0 1976-03-19 08:28 #12207
sr-xrwSr--. 1 4229628009 4228087921     0 1976-03-19 08:28 #12249




-Eric
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