RSDEV=/dev/sda14

df
/dev/sda14            51197536  37636660  13560876  74% /lfs/cache12

umount /lfs/cache12

$ reiserfsck --check $RSDEV
reiserfsck 3.6.19 (2003 www.namesys.com)
Reiserfs journal '/dev/sda14' in blocks [18..8211]: 0 transactions replayed
Checking internal tree..finished
Comparing bitmaps..finished
Checking Semantic tree:
finished
No corruptions found

$ resize_reiserfs $RSDEV
resize_reiserfs 3.6.19 (2003 www.namesys.com)

ReiserFS report:
blocksize             4096
block count           19908528 (12799776)
free blocks           10498754 (3390219)
bitmap block count    608 (391)

Syncing..done
resize_reiserfs: Resizing finished successfully.

!reiserfsck
No corruptions found

mount /lfs/cache12

df | grep !$
/dev/sda14            79631676  37636660  41995016  48% /lfs/cache12

Necessary prepare:

RSDEV=/dev/sda15

% umount $RSDEV

% reiserfsck --check $RSDEV
Will read-only check consistency of the filesystem on /dev/sda15
Will put log info to 'stdout'

Do you want to run this program?[N/Yes] (note need to type Yes if you do):Yes

Replaying journal..
Reiserfs journal '/dev/sda15' in blocks [18..8211]: 0 transactions replayed
Checking internal tree..finished
Comparing bitmaps..finished
Checking Semantic tree:
finished
No corruptions found
There are on the filesystem:
        Leaves 42697
        Internal nodes 287
        Directories 11326
        Other files 147601
        Data block pointers 11114762 (7469 of them are zero)
        Safe links 0

Resize reiserfs partition with gparted. First try to resize down just 10M.

% gparted &

$ fdisk -l | grep $RSDEV
/dev/sda15          17417       24791    59239656   83  Linux

Yes, partition resized.

% mount $RSDEV
% umount $RSDEV

Yes, mounting/unmounting don't have any problem.

% reiserfsck --scan-whole-partition --check $RSDEV

Everything tested OK. Redo the last steps to resize reiserfs partition to the desired size.

documented on: 2006.12.03

From resize_reiserfs' man page:

The following example shows how to test resize_reiserfs. Suppose 2Gb reiserfs filesystem is created on the device /dev/hda8 and is mounted on /mnt. For shrinking the device we need to unmount it first, then run resize_reiserfs with a size parameter (in this case -1Gb):

df
umount /mnt
resize_reiserfs -s -1G /dev/hda8
mount /dev/hda8 /mnt
df /mnt