ReiserFS File Undelete HOWTO
If you accidentally deleted some files from a ReiserFS partition, don't loose hope, you may recover your data following this howto. In this example, the ReiserFS filesystem is mounted on /home directory and the ReiserFS device is /dev/hda1.
As root, unmount the ReiserFS partition where the deleted files are
umount /home
If you can not umount the partition (umount: /home: device is busy),
try again in single user mode
init 1
or even better, boot from a Linux Live cdrom.
Backup the partition. It is highly recommended to backup the current partition after booting from a Linux Live cd. This will create a file of your whole disk. It is best to create this file on a different disk of equal or bigger size than the disk you are trying to recover the deleted files from. If the original hard disk was 40 Gb, you should be creating this file on another disk with 40 GB or more.
dd if=/dev/hda1 of=reiserfs.dd bs=4096 conv=noerror
Undelete the files by scanning the whole partition
reiserfsck --rebuild-tree --scan-whole-partition reiserfs.dd
Create the mount point
mkdir /mnt/recovery
Mount the image on this directory
mount -o loop reiserfs.dd /mnt/recovery
Some recovered files will be at their previous location but most recovered files
will be in /mnt/recovery/lost+found. Now remount the original partition
mount /home
and copy the recovered files to the original place.
For desperate cases, you can also try PhotoRec.