Miklos Szeredi [off-list ref] wrote:

  children/$CHILD_ID -> ../../$CHILD_ID

This would really suck.  This bit would particularly affect rescanning time.

You also really want to read the entire child set atomically and, ideally,
include notification counters.

 supers/$SUPER_ID/
   type: fstype
   source: mount source (devname)
   options: csv of mount options

There's a lot more to fsinfo() than just this lot - and there's the
possibility that some of the values may change depending on exactly which file
you're looking at.

David