config NILFS2_FS
  	tristate "NILFS2 file system support"
  	select CRC32
  	help
  	  NILFS2 is a log-structured file system (LFS) supporting continuous
  	  snapshotting.  In addition to versioning capability of the entire
  	  file system, users can even restore files mistakenly overwritten or
  	  destroyed just a few seconds ago.  Since this file system can keep
  	  consistency like conventional LFS, it achieves quick recovery after
  	  system crashes.
  
  	  NILFS2 creates a number of checkpoints every few seconds or per
  	  synchronous write basis (unless there is no change).  Users can
  	  select significant versions among continuously created checkpoints,
  	  and can change them into snapshots which will be preserved for long
  	  periods until they are changed back to checkpoints.  Each
  	  snapshot is mountable as a read-only file system concurrently with
  	  its writable mount, and this feature is convenient for online backup.
  
  	  Some features including atime, extended attributes, and POSIX ACLs,
  	  are not supported yet.
  
  	  To compile this file system support as a module, choose M here: the
  	  module will be called nilfs2.  If unsure, say N.