Resize LVM ReiserFS Partition

Mucking about with LVM and partitions isn’t really taxing, it’s all well documented. Trusting it however is a different matter. I’ve resized loads of Ext3 LVM partitions in the past, but was asked to resize a ReiserFS one today, which made me ask the question:

Is there anything writing to it currently, as I will have to unmount it first ..

Wrong assumption, or so says the guy sat next to me! ReiserFS can be dynamically resized on the fly! Woohoo says I, lets have a look at the resize_reiserfs man page!