This is an update of the i_version patch.
The i_version field is a 64bit counter that is set on every inode
creation and that is incremented every time the inode data is modified
(similarly to the "ctime" time-stamp).
The aim is to fulfill NFSv4 requirements for rfc3530.
The patch set is divided into 2parts, the vfs layer and a ext4 specific
Any comments welcome.