If your original reiserfs volume has problem,
you can not mount your snapshot volume, anywhere.
At that case, you must umount your reiserfs volume,
and run "reiserfsck".
If it is O.K., then you can mount your reiserfs volume,
re-create snapshot volume for that reiserfs original volume.
Now you can mount your snapshot volume.
Maybe OK, I successed.
I have problem.
I do not want to unmount original reiserfs volume, because of running file system.
Reiserfs volume can not run "reiserfsck" with read/write mounted state, in my knowledge.
CAN WHO advise how can I run fsck for mounted reiserfs volume with read/write state ?