ok, well it turned out to be an USB problem (again !)
(forgot to mention that one partition is on the box the other one external USB),
here's the output after having "unmounted" the partition:
[12671.058096] __ratelimit: 30140 callbacks suppressed
[12671.058106] Buffer I/O error on device dm-2, logical block 3562
[12671.058106] lost page write due to I/O error on dm-2
[12671.058106] Buffer I/O error on device dm-2, logical block 3563
[12671.058106] lost page write due to I/O error on dm-2
and here the output of fsck.reiserfs /dev/mapper/usb
fsck.reiserfs /dev/mapper/usb
reiserfsck 3.6.20
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiserfsprogs/COPYING.
*************************************************************
** If you are using the latest reiserfsprogs and it fails **
** please email bug reports to reiserfs-list@xxxxxxxxxxx, **
** providing as much information as possible -- your **
** hardware, kernel, patches, settings, all reiserfsck **
** messages (including version), the reiserfsck logfile, **
** check the syslog file for any related information. **
** If you would like advice on using this program, support **
** is available for $25 at www.namesys.com/support.html. **
*************************************************************
Will read-only check consistency of the filesystem on /dev/mapper/usb
Will put log info to 'stdout'
Do you want to run this program?[N/Yes] (note need to type Yes if you do):Yes
###########
reiserfsck --check started at Mon Aug 25 15:43:55 2008
###########
Replaying journal..
Trans replayed: mountid 31, transid 2783, desc 710, len 1, commit 712,
next trans offset 695
Trans replayed: mountid 31, transid 2784, desc 713, len 352, commit
1066, next trans offset 1049
Trans replayed: mountid 31, transid 2785, desc 1067, len 308, commit
1376, next trans offset 1359
Trans replayed: mountid 31, transid 2786, desc 1377, len 669, commit
2047, next trans offset 2030
Trans replayed: mountid 31, transid 2787, desc 2048, len 146, commit
2195, next trans offset 2178
Trans replayed: mountid 31, transid 2788, desc 2196, len 438, commit
2635, next trans offset 2618
Trans replayed: mountid 31, transid 2789, desc 2636, len 571, commit
3208, next trans offset 3191
Trans replayed: mountid 31, transid 2790, desc 3209, len 137, commit
3347, next trans offset 3330
Reiserfs journal '/dev/mapper/usb' in blocks [18..8211]: 8 transactions replayed
Checking Internal tree...
0%....20%....40%....60%....80%....100%
Checking Semantic tree...
There are on the filesystem:
Leaves 110029
Internal nodes 720
Directories 29714
Other files 333471
Data block pointers 54669713 (0 of them are zero)
Safe links 0
No corruptions found
###########
reiserfsck finished at Mon Aug 25 15:52:40 2008
good job ! no data-loss
sorry for the false alarm
Regards,
Mat
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