What:		/sys/fs/nilfs2/features/revision
Date:		April 2014
Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
		Show current revision of NILFS file system driver.
		This value informs about file system revision that
		driver is ready to support.

What:		/sys/fs/nilfs2/features/README
Date:		April 2014
Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
		Describe attributes of /sys/fs/nilfs2/features group.