- (dir) inode versions..
- cdir fetch/store versioned dentries
-- migrator import/export of versioned dentries, inodes... drop them on export...
- emetablob.. journaling a versioned update..
+ [0,head] foo
+ becomes
+ [0,10] foo
+ [11,head] foo
+ and blob contains simply
+ [11,head] foo
+ that means replay _AND_ fetch have to convert the [0,head] foo into [0,10] foo.
+?
+
+- migrator import/export of versioned dentries, inodes... drop them on export...
+
- path_traverse handling of .snapshot?
primary file link -> old inode