RE: 2nd Attempt - FSCK Errors

["Stephen Elliott" <techweb@ntlworld.com>]

Hi,

Appreciate the help...

As requested:

despair:/c/PREMIER# lsattr "Premier Automation Purchase OrdersApp V18.5.mdb"
-------------e- Premier Automation Purchase OrdersApp V18.5.mdb

What does this mean???

The file is important as it is an Orders database and is backed up daily :)
So far no actual issues experienced with using the file (MS Access DB)

I can perhaps run that debugfs command but to be clear I assume there is no
risk providing I unmount the FS beforehand? How big is the file generated
likely to be, ball park? 

As for the other options of updating, I am somewhat bound by the FW versions
the ReadyNAS units use, unless I start messing with it, which would likely
void any warranty anyway.

Many Thanks
Stephen Elliott

-----Original Message-----
From: Andreas Dilger [mailto:adilger@dilger.ca] 
Sent: 30 April 2013 17:15
To: <techweb@ntlworld.com>
Cc: <linux-ext4@vger.kernel.org>
Subject: Re: 2nd Attempt - FSCK Errors

On 2013-04-30, at 8:00, "Stephen Elliott" <techweb@ntlworld.com> wrote:
> Just rebooted my box today after 200 days uptime and thought I'd request a
volume scan and it found errors! I've never had a power outage etc so am
keen to know what could have caused this file system corruption? Anyu
ideas???
> 
> I'm running 4.2.21 on a ReadyNAS Pro6, but ultimately it is a Linux
(Debian) 2.6.37.6. based system underneath. 
> 
> ***** File system check forced at Fri Apr 26 20:08:38 WEST 2013 ***** 
> fsck 1.41.14 (22-Dec-2010) e2fsck 1.42.3 (14-May-2012) Pass 1: 
> Checking inodes, blocks, and sizes Inode 4195619, i_blocks is 3135728, 
> should be 3135904. Fix? yes

This is because the inode shows 176 sectors = 22 filesystem blocks allocated
than expected. Is this perhaps an extent format file? Try "lsattr
{filename}" and look for "e" in the file flags. 

> Running additional passes to resolve blocks claimed by more than one
inode...
> Pass 1B: Rescanning for multiply-claimed blocks Multiply-claimed block(s)
in inode 4195619: 167904376 167904377 167904378 167904379 167904380
167904381 167904382 167904383 167904384 167904385 167904386 167949296
167949297 167949298 167949299 167949300 167949301 167949302 167949303
167949304 167949305 167949306 Pass 1C: Scanning directories for inodes with
multiply-claimed blocks Pass 1D: Reconciling multiply-claimed blocks (There
are 1 inodes containing multiply-claimed blocks.

This is consistent with the one inode suddenly growing 22 blocks longer. 

> File /PREMIER/Premier Automation Purchase OrdersApp V18.5.mdb (inode 
> #4195619, mod time Fri Apr 26 20:07:42 2013) has 22 multiply-claimed
block(s), shared with 0 file(s):
> Multiply-claimed blocks already reassigned or cloned.

This could be failing if the duplicate blocks are inside the same file?
I don't know if that is something that e2fsck expects or not?  I wonder if
the extent tree is corrupted in some manner, but it isn't being detected
during the duplicate block scan.

This file looks big and important, so the first thing I would suggest is to
make a backup copy of it ASAP if you haven't already (having a backup is
always a good idea). Then, I'd suggest to update to the latest e2fsprogs
1.42.7 and try again, since there was a bug fixed in the e2fsck extent
handling.

If that doesn't fix it, please dump the allocated file blocks with "debugfs
-c -R 'stat <4195619>' /dev/c/c" so we can see what it looks like (probably
gzipped and as an attachment, since it will be pretty large).

Cheers, Andreas=