Re: Broken nilfs2 filesystem

[Anton Eliasson <devel-17Olwe7vw2dLC78zk6coLg@public.gmane.org>]

Reinoud Zandijk skrev 2013-06-06 11:20:
> Hi,
>
> just my $0.02 so to say:
>
> On Thu, Jun 06, 2013 at 10:56:09AM +0400, Vyacheslav Dubeyko wrote:
>> First of all, unfortunately, I can't reproduce the issue yet, currently.
>> I suspect that in this issue the aging state of volume, peculiarity of
>> workload and environment play very important role. As I remember, all
>> reporters of likewise symptoms (broken bnode error messages) talked
>> about several months of successful working of NILFS2 file system.
> sounds to me as if a b-tree is in a perculiar state and that updating the
> btree results in this corruption.
>
> Have you tried to mount one of the checkpoints/snapshots earlier as RO and see
> if those are correct? If so, dumping both DATs and both btrees might give a
> clue as to what went wrong. If only it gives a clue as to how complicated the
> btree is before the updating and what actions are taken on it.
>
> With regards,
> Reinoud
>
I have configured nilfs_cleanerd.conf to clean very aggressively so my 
earliest checkpoint is from after the incident. I included the contents 
of that file in my first email sent on May 22 
(http://article.gmane.org/gmane.comp.file-systems.nilfs.user/2920).

Even so, I tried to loopback mount the oldest checkpoint I have which I 
found was affected by the same corruption.

# losetup /dev/loop0 /Athena/Dump/riven/riven-home-20130531.img
# mount /dev/loop0 /mnt
$ mount | tail -1
/dev/loop0 on /mnt type nilfs2 (ro,relatime,norecovery)
$ lscp /dev/loop0
                  CNO        DATE     TIME  MODE  FLG NBLKINC       ICNT
              1260571  2013-05-23 16:51:49   cp    -          140 155496
              1260572  2013-05-23 16:51:51   cp    -         1632 155495
              1260575  2013-05-23 16:52:06   cp    -         1473 155496
              1260576  2013-05-23 16:52:09   cp    -           49 155495
              1260580  2013-05-24 23:36:11   cp    -         1345 155496
              1260581  2013-05-24 23:36:16   cp    -         1500 155495
              1260582  2013-05-24 23:36:21   cp    -         1356 155497
              1260583  2013-05-24 23:36:26   cp    -         1465 155495
# chcp ss /dev/loop0 1260571
# umount /mnt
# mount -o ro,norecovery,cp=1260571 /dev/loop0 /mnt
$ cd /mnt/anton/Bilder/20130321-28\ Jakobs\ bilder\ från\ Nederländerna
$ LANG=C cat *>/dev/null
cat: 160.JPG: Input/output error
cat: 163.JPG: Input/output error
cat: 164.JPG: Input/output error
cat: 165.JPG: Input/output error
cat: 170.JPG: Input/output error
cat: 172.JPG: Input/output error
cat: 179.JPG: Input/output error

-- 
Best Regards,
Anton Eliasson

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