Re: crashed big reiser-partition with parted. any help?

[Yury Umanets]

address@hidden wrote:

> hi!
>
> i just crashed my reiserfs partition upon shrinking the underlying partition
> with parted.
> is there a way to get my data back?
>
> parted - recover did not help.
>
> there is only one primary partition 120 gb reiser standart (taken all
> defaults)
> i wanted to shrink by 10% (to move to lvm part for part :-).
> there were aproximately 100gb data on this disk.
>
> resize-reiser did the job, now i wanted to shrink the partition too...
> fdisk could only change cylinders, but showed inconsistent values for 
> the last cylinder, and i did not want to calculate the exact numbers..
> so i choose parted.
>
> parted, reisertools, libreiser, kernel (2.4.20), etc are all latest
> (self-compiled).
> i use debian woody
>
> progsreiserfs-0.3.0.3.tar.gz   
> e2fsprogs-1.32.tar.gz                     
> reiserfsprogs-3.6.4.tar.gz
> linux-2.4.20.tar.bz2                      
> parted-1.6.3.tar.gz    (tricky to understand that libreiserfs is not ncluded
> in reisertools)
>
>
> below a screenshot from the short way to data-nirvana:
> ===========================================
>
> reiser_resize (shrinked fs by 10% ok). 
> (was this the reason? does parted wants to resize_reiser by itself?)
>
> zeus:/usr/src/parted-1.6.3# parted
> GNU Parted 1.6.3
> Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
> This program is free software, covered by the GNU General Public License.
>
> This program is distributed in the hope that it will be useful, but WITHOUT
> ANY WARRANTY; without even the i
> A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
>
> Using /dev/hdc
> Information: The operating system thinks the geometry on /dev/hdc is
> 116301/16/63.  Therefore, cylinder 1024
> (parted)
> (parted)
> (parted) select /dev/hdb
> Using /dev/hdb
> Information: The operating system thinks the geometry on /dev/hdb is
> 239340/16/63.  Therefore, cylinder 1024
> (parted)
> (parted) print
> Disk geometry for /dev/hdb: 0.000-117800.156 megabytes
> Disk label type: msdos
> Minor    Start       End     Type      Filesystem  Flags
> 1          0.031 117800.156  primary   reiserfs
> (parted) print 1
> Minor: 1
> Flags:
> File System: reiserfs
> Size:         117800.125Mb (99%)
> Minimum size:  99104.016Mb (84%)
> Maximum size: 117800.156Mb (100%)
> (parted)
> (parted) resize 1 0.031 100000
> shrinking... 11%        (time left 486:59)Error: Invalid node detected
> (37083). Unknown type.
> (parted)
> (parted) print 1
> Error: Could not detect file system.
> (parted) q
> Information: Don't forget to update /etc/fstab, if necessary.
>
> zeus:/usr/src/parted-1.6.3#
> zeus:~#
> zeus:~# mount /dev/hdb1 /mnt/2
> mount: you must specify the filesystem type
> zeus:~# mount -t reiserfs /dev/hdb1 /mnt/2
> mount: wrong fs type, bad option, bad superblock on /dev/hdb1,
>       or too many mounted file systems
> zeus:~#
>
>
> thank you for your help!
>
>  
My vision is the following:
Apparently you have had broken filesystem before you was trying to 
shrink it. That is because libreiserfs was unable to determine what node 
format is used (leaf node or internal one). Node header was demaged.

But I don't understand, why superblock was corrupted too (it was I think)

I recomend you use reiserfsck for recovering your data.

--
Yury Umanets